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The pros and cons of the points of the touch screen
Folks on to the next to Treemass youth, people have started using an electronic components with a touch screen, and enjoy a more intuitive and convenient operation, but at the same time is also accompanied by another phenomenon: even if the hardware configuration has been reached the smooth running system requirements of the application, but the user does not have any sense of smooth, like cottage manufacturers, the price is very attractive Android phone, although sometimes high but their fluency but not with the hardware - Caton phenomenon in direct proportion touch screen has become a short board.

The touch screen is a necessary part of human-computer interaction, so it's sensitivity and response speed is particularly important, the majority of manufacturers to purchase and use capacitive touch screen is present, the most mature application solutions, the appearance of seemingly the same " transparent within the panel was a great tide, the touch screen is good or bad a direct result of human-computer interaction in the process of smooth or not.

The structure of the capacitive touch screen
The capacitive touch screen is like a sandwich on a platter, "plate" is closest to the electronic equipment electrical components, it has played a role shielded electrical signal, in order to avoid interference to the touch screen; contact with the "plate" , as well as the top layer of bread "for the non-conductive (dielectric) glass, which is play a protective role; folder in the middle of the two layers of bread", "butter" is the most critical condiments, responsible for the induction of the human body electric field and detect the touch point, an electronic device that can give users a smooth feel, thanks to the "seasoning" to enhance the flavor.

The working principle of the capacitive touch screen
The capacitive touchscreen internally by the driving electrode and the receiving electrode, the drive electrodes to the projection of the low-voltage high-frequency signal to the receiving electrode to form a stable current, grounded because the body when the human body touches a capacitive screen, a finger with a capacitive touch panel is formed an equivalent capacitors, high-frequency signal can be through this equivalent capacitance which flows into the ground, whereby the receiving end receives the charge amount is reduced, while when the finger closer to the transmitting end, the charge is reduced more significantly, the last received according to the receiving end The intensity of the current to determine the touch point. As for the multi-touch, simply said, is the split-screen, in each region of each mutual capacitance module works independently, so capacitive screen can be independently detected by the touch of the area, for processing After multi-touch.

Sensitivity
Intermediate "sauce" determine the sensitivity and response time of the capacitive touch screen. Affect the sensitivity of which is called the contact diameter. We can be a capacitive touch panel is divided into a small divide the region, the contact diameter is the distance between the two close to the regional center, the smaller the contact diameter, the higher recognition rate of the touch screen, for example, some touch-screen the area of ​​the entire finger belly pressed to recognize the signal, while others need only the fingertips.

Get the latest Windows 8 operating system, Microsoft's official minimum the contact diameter required for Win8 touch screen 9mm, which means that we use the touch screen, finger to compare hard press on the screen to ensure that the contact area. As a yardstick to 9mm in diameter, in some cases, the system may not recognize the swipe gesture, for example, you get the contact area than the capacitive pen to write with your finger, but only intermittently displayed on the touch screen handwriting, even no response, so the smaller the diameter of the contact on behalf of the more excellent the touch screen.

Response Time
The contact diameter determine the sensitivity of the touch screen, and the response time is another major factor affecting the touch screen feel. Finger or capacitive stylus to write or draw on the screen, we will find the trace on the screen at a distance with his writings. If our fingertips only slowly across the screen, then the gap between the different touch screen response time will not be reflected very obvious. But in fact after the customary system to find, browse the web, handwritten text, graphics rendering operation, the speed of movement of fingers or his writings will become soon. If the touch screen response time is too long, then displayed on the screen will be seriously behind the finger or the tip of the brush, the user will be able to slow down, thus affecting the operating experience.

Same the the Microsoft official standard, which provides touch screen response time should not be greater than 50 milliseconds, including the diameter of 9mm contacts described above, to ensure that the hardware requirements, which are the most basic of all the market pre-installed Win8 operating system touch screen notebook are able to meet this standard, but most are not just passing, if you want to really enjoy the superior experience you need to meet higher standards.

Take Asus VivoBook S400 For example, this super pole is equipped with touch-screen contact diameter reduced to 5 mm, Win8 system with your fingers sliding operation without any interruption Caton phenomenon, even smaller capacitance of the contact area rapid writing pen can also be handy.

At the same time, S400 resistance to outside interference, the use of signal booster and hopping technology, effectively improve the signal to noise ratio and improve the response time of the touch screen. 50 millisecond response time standard with Microsoft, Asus VivoBook S400 will raise this standard to 30 milliseconds, so fingertips optional touch screen panel can get immediate response.

Hardware as infrastructure is certainly important, but now has become one of the most important aspects of human-computer interaction touch screen instead of physical buttons, at this stage, the majority of manufacturers to purchase and use capacitive touch screen look basically the same, with the naked eye can not identify the nature of , which also makes the touch screen becomes an invisible barrier, excellent touch screen can be a good assistant for other hardware and system applications, poor touch screen will limit other hardware to play a short board, thus affecting the user experience, so optional touch-screen equipment, particularly large-size touch-screen notebook, consumers should take the time to personally experience. ]]> https://ameblo.jp/cpb2b/entry-11528254690.html Sat, 11 May 2013 10:23:33 +0900 Lithium-ion battery Name Description
Is now widely used lithium-ion battery is evolved by a lithium battery. Recognize the lithium-ion battery, the first to introduce lithium battery.
For example, before the cameras used button batteries are lithium batteries. The negative electrode material for lithium battery is a lithium metal, a positive electrode material is a carbon material. In accordance with the naming rules on everyone is used to, we call this battery is a lithium battery.
The positive electrode material for lithium ion battery is a lithium cobalt oxide, a negative electrode material is a carbon material. Battery through the positive lithium ions generated at the anode carbon material embedded and move out of the battery charge and discharge process, in order to distinguish it from the traditional sense of the lithium battery known as lithium-ion battery.
Wide variety of uses of the lithium ion battery
The purpose of the development of high-tech in order to make it better serve the human. Lithium-ion batteries since its inception in 1990, because of its excellent performance has been rapid development, and widely used in society. Lithium-ion battery unparalleled advantages to other battery quickly occupied many areas, like the well-known mobile phone, laptop, small camera and more and more countries the batteries used in military applications. The application shows that the lithium-ion battery is an ideal green power.
The main constituent of the lithium-ion battery
(1) The battery cover
(2) Positive electrode - active material for lithium cobalt oxide
(3) diaphragm - a special composite membrane
(4) The negative electrode - active material is carbon
(5) an organic electrolyte solution
(6) The battery housing
Superiority of the lithium ion battery
We often say that the superiority of lithium-ion batteries in terms of conventional nickel cadmium batteries (Ni / Cd) and nickel-metal hydride battery (Ni / MH). Lithium-ion battery, then what was good?
(1) Operating voltage high
(2) energy
(3) long cycle life
(4) low self-discharge rate
(5) no memory effect
(6) pollution
The following is a nickel-cadmium, nickel metal hydride, lithium-ion battery performance comparison:
Technical parameters of nickel-cadmium batteries nickel-metal hydride battery lithium-ion battery
Operating voltage (V) 1.2 1.2 3.6
The weight ratio of energy (Wh / Kg) 50 65 105-140
The volume ratio of the energy (Wh / l) 150 200 300
Charge-discharge life (times) 500 500 1000
Self-discharge rate (% / month) 25-3030-356-9
Have memory effect there is no
Non-polluting Yes No No
(Note: The charge rate of 1C)
Lithium-ion battery works
As we all know, the positive electrode material of the lithium-ion battery is a lithium cobalt oxide, a negative electrode is a carbon.
The lithium-ion battery works is its charging and discharging. When charging the battery, the positive electrode of the battery manufacturer, lithium ions generated the generated lithium ion movement through the electrolyte to the negative electrode. And carbon as a negative electrode layered structure, it has a lot of micropores, reach the negative electrode of lithium ions embedded into the porous carbon layer, the embedded lithium ions, the more the higher the charge capacity.
Similarly, when the discharge of the battery (the process) we use the battery, the lithium-ion embedded in the carbon cathode layer prolapse movement back to the cathode. Back to the positive electrode of the lithium ion, the more the higher the discharge capacity. We usually battery capacity of said fingers is the discharge capacity.
Not difficult to see during charging and discharging of the lithium-ion batteries, lithium-ion is from the positive → negative → positive state of motion. If we liken the lithium-ion battery for a rocking chair, rocking chair at both ends of the poles of the battery, the lithium-ion like a good athlete, running back and forth at both ends of the rocking chair. Therefore, the experts gave a rocking chair battery lithium-ion battery is a cute name.
The assembling process of the lithium-ion battery
Lithium-ion battery technology is very strict and complex, there can only be a brief introduction of several major processes.
(1) Pulp
Using a special solvent and the adhesive, respectively, the positive and negative active material and the powdery mixture,
After high-speed Stir slurried positive and negative substances.
(2) The coating film
The slurry was uniformly coated surface of the metal foil, drying, respectively made positive
The negative electrode sheet.
(3) assembly
Positive films - diaphragm - negative film - Diaphragm top-down order is put away, winding
Made the battery pole core, and then injected into the electrolyte, sealing process, to complete the electrical
Pool assembly process, finished goods battery.
(4) into
Finished battery charge and discharge testing with a dedicated battery charging and discharging equipment, for each
Only battery detection, screening qualified finished battery pack to be shipped.
The security features of the lithium-ion battery
The lithium-ion battery has been very widely used in people's daily lives, so the performance of its security should be the first item of the lithium-ion battery assessment indicators. Indicators for the assessment of the safety performance of lithium-ion battery, the international regulations of very strict criteria, a qualified lithium-ion battery safety performance should meet the following criteria.
(1) Short: No fire, no explosion
(2) Overcharge: no fire, no explosion
(3) hot box test: no fire, no explosion (150 ° C constant temperature for 10 minutes)
(4) acupuncture: no explosion ( 3mm nail penetrate the battery)
(5) plate impact: no fire, no explosion (10kg heavy pound battery from 1M height)
(6) incineration: and no explosion (gas flame BBQ battery)
The lithium-ion battery safety features is how to achieve?
In order to ensure the safe and reliable use of lithium-ion battery, the experts were very strict, careful design of battery safety, in order to achieve the the battery safety assessment indicators.
(1) diaphragm 135 ° C Automatic shutdown protection
Using the international advanced Celgard2300PE-PP-PE three-layer composite film. In the case of the battery temperature reaches 120 ° C, PE film on both sides of the composite membrane hole closed, the internal resistance of the battery increases, the battery internal temperature mitigation, when the battery temperature reaches 135 ° C, PP film hole is closed, the internal battery disconnection, the battery is no longer warming, to ensure safe and reliable battery.
(2) additives are added to the electro-hydraulic
Overcharge the battery, the battery voltage is higher than 4.2v conditions, the electro-hydraulic additives and other substances in the electro-hydraulic polymerization mate increase in the internal resistance of the battery, disconnection of a large area inside the battery, the battery is no longer heating up.
(3) The battery cover composite structure
The battery cover with the notch explosion-proof structure, the battery temperature, the expansion part of the gas generated in the battery internal activation process, the battery internal pressure increase, the pressure reaches a certain degree notch rupture and bleed.
(4) a variety of environmental abuse test
Various abuse tests, such as an external short circuit, overcharge, acupuncture, plate impact, incineration, examine the safety performance of the battery. The battery temperature shock test and vibration, drop, shock and other mechanical properties test, study the performance of the battery in the actual use of the environment.
The lithium-ion battery is a new green battery
Care for the environment, protect the earth, "is the bounden duty of every one of us. How our environmental philosophy reflected in action?
Battery consumers should buy, the use of new green battery; battery manufacturers should produce new green battery. Only through our joint efforts to create, protect our beautiful and harmonious natural environment.
The new green battery means in recent years has been put into use or being developed by a class of high-performance, non-polluting batteries. Already extensive use of lithium-ion batteries, nickel metal hydride battery, and are promoting the use of mercury-free alkaline manganese batteries and plastic being developed lithium or lithium ion batteries, fuel cells, electrochemical storage super capacitor is a new type the scope of the green battery. In addition, has been widely used for the use of solar performs photoelectric conversion of the solar cell (also known as photovoltaic power generation), also belong to this category. ]]> https://ameblo.jp/cpb2b/entry-11518144962.html Thu, 25 Apr 2013 17:43:08 +0900
Recently, it is understood Shandong Tian Yang New Energy Co., Ltd. developed a type lithium iron phosphate lithium battery, it is now excellent, got the unanimous approval of the people in the industry, they say, this ground-breaking research in the days battery to fill gaps in the industry, bringing new energy development of electric vehicles.

In recent years, with the rapid rise of the domestic electric vehicle industry, lightweight high-energy battery lithium iron phosphate has become the development direction of alternative lead-acid motive battery market potential is limitless. This end, starting from March 2011, the company set up a special project team by five senior scientific and technical personnel in command, started to develop exclusively for lithium iron phosphate battery for electric vehicles. No mature technology can learn from the case, after more than nine months of technical research, R & D personnel of the project team to overcome a number of lithium battery industry technical bottleneck, not only solved the battery box waterproof, compression and cooling challenges, and the original modular battery production installation technology, according to the different models of compatibility as possible to meet the upgrading of existing electric vehicle battery.

In addition, the project team developed integrated battery management system can effectively guarantee the reliability and safety of LiFePO4 batteries during use, highly commendable electric car manufacturers, through a variety of models of electric vehicles matching test, the iron phosphate lithium electric vehicle battery power the performance parameters better than design specifications, in full compliance with the requirements.

The person in charge of the total: the future the company will take orders for the method for mass production, supporting cooperation intention has been reached and the number of electric vehicle manufacturers, the breakthrough in lithium battery technology breakthrough win industry attention, some investors started to invest in the development of a new type of lithium iron phosphate lithium battery industry. ]]> https://ameblo.jp/cpb2b/entry-11509362091.html Thu, 11 Apr 2013 16:01:37 +0900
Lithium is a metallic element, its chemical symbol Li (English called lithium) is a silvery white, very soft, reactive metal and chemical properties, is the lightest metal. It is applied to the atomic energy industry, the manufacture of specialty alloys, specialty glass (on the TV screen glass) and lithium batteries. In the lithium battery, which is used as the anode of the battery.

Lithium batteries can also be divided into two categories: two types of non-rechargeable and rechargeable. Called non-rechargeable batteries, disposable batteries, it can only chemical energy once converted into electrical energy, can not restore the energy back to chemical energy (or restore performance poor). Known as secondary batteries and rechargeable batteries (also called battery). Can convert electrical energy into chemical energy store, when in use, and then to convert chemical energy into electricity, it is reversible, the main characteristics of the lithium battery such as electricity chemical energy.

The most important feature of the lithium battery high specific energy. What is the ratio of energy? Refers to the ratio of the energy per unit weight or unit volume of energy. Wh / ​​kg or Wh / L ratio of the energy. Wh is a unit of energy, W is watts, h is the hour; kg kg (unit of weight), L is the liter (volume unit). Here is an example to illustrate: 5 nickel-cadmium battery rated voltage of 1.2V, a capacity of 800mAh, the energy 0.96Wh (1? 2V x 0? 8Ah). Same size lithium - manganese dioxide battery rated voltage is 3V, capacity 1200mAh, its energy 3.6Wh. Both cell volume is the same, 3.75 times the specific energy of lithium - manganese dioxide battery is a nickel-cadmium battery!

A nickel-cadmium battery weighs about 23g, and a lithium - manganese dioxide battery weighs about 18g. A lithium - manganese dioxide battery 3V, the two nickel-cadmium batteries 2.4V. Small quantity of batteries using lithium batteries (portable electronic components volume is reduced, weight reduction), and the long working life of the battery.

Other lithium batteries have a stable discharge voltage, wide operating temperature range, low self-discharge, long storage life, no memory effect and pollution-free advantages.

The disadvantage of lithium batteries is expensive, so is still not widely used, mainly used in handheld computers, PDAs, communication equipment, cameras, satellites, missiles, torpedoes, instruments. With the development of technology, process improvement and increase of production, the price of lithium batteries will continue to decline, applications will be more prevalent. Non-rechargeable lithium battery non-rechargeable lithium batteries have a variety of used lithium - manganese dioxide batteries, lithium - thionyl chloride battery and lithium and other compounds batteries. This paper describes only the most commonly used.

Lithium - manganese dioxide battery is a lithium anode, manganese dioxide as the cathode, and the organic electrolyte solution disposable batteries. The main characteristics of the battery is the battery voltage and rated voltage of 3V (2-fold) is generally alkaline batteries; terminate the discharge voltage of 2V; specific energy (see the above cited examples); stable discharge voltage; have better storage performance (more than 3 years of storage time), low self-discharge rate (annual self-discharge rate ≤ 2%); -20 ° C to +60 ° C operating temperature range.
The battery can be made ​​into different shape to meet different requirements, it has a rectangular, cylindrical and button-shaped (snap). The cylindrical shape also has a different diameter and height.

The figure is Japan Maxell lithium - manganese dioxide battery, 3 volt, non-rechargeable, the volume of a single 15x40 mm.

Rechargeable lithium-ion battery

Rechargeable lithium-ion battery is currently the most widely used mobile phone applications battery, but it is more "squeamish" and not use the overcharge, over-discharge (may damage the battery or to make end-of-life). Therefore, the protection components or circuit protection to prevent costly damage to the battery in the battery. The lithium-ion battery is demanding, to ensure that the termination voltage accuracy of 1%, the current major semiconductor device factory has developed a variety of lithium-ion battery charging IC to ensure safe, reliable and fast charging.

The phone is now very common part of the phone is a nickel-metal hydride battery, but the smart phone is a lithium-ion battery. Correct use of the lithium-ion battery to extend the battery life is important. Lithium ion batteries are currently the most widely used lithium batteries, flat rectangular, cylindrical, rectangular and button it can be made according to the requirements of the different electronic products, and by several batteries in series with a battery pack. The lithium-ion battery rated voltage of 3.6V (some products 3.7V). Related to termination when fully charged, the charging voltage and battery anode materials: anode material is graphite 4.2V; anode material as coke 4.1V. The internal resistance of the anode material is also different, slightly larger than the internal resistance of the anode of coke, and the discharge curve is also slightly different, as shown in Figure 1. Commonly referred to as 4.1V lithium-ion battery and 4.2V lithium-ion battery. Now use the majority of the termination of the discharge voltage of 4.2V, a lithium ion battery is 2.5V ~ 2.75V (cell factory given operating voltage range or a given discharge voltage, each parameter is slightly different). Below the termination of the discharge voltage to continue to discharge called over-discharge, over-discharge of the battery will be damage.

The lithium-ion battery is not suitable for large current discharge, reduce the discharge time when a large current discharge (internal will result in higher temperatures and loss of energy). Therefore, battery production plant gives the maximum discharge current, in use, should be less than the maximum discharge current. The lithium-ion battery temperature, the factory charging temperature range, the discharge temperature range Storage temperature range. The lithium-ion battery charging requirements is very high, and it requires a precision of the charging circuit in order to ensure the safety of charge. Terminate the charge voltage accuracy tolerance is the rated ± 1% (for example: the to charge 4.2V lithium-ion battery, the tolerance is ± 0.042V), over-voltage lithium ion battery charging will cause permanent damage. The lithium-ion battery charging current should be in accordance with the recommendations of the battery manufacturing plant, and requires current limiting circuit in order to avoid over-current (overheating). Commonly a charging rate of 0.25C to 1C (C is the capacity of the battery, such as C = 800mAh, 1C charging rate, the charging current of 800mA). Tend to detect high current charging battery temperature to prevent overheating and damage the battery or an explosion.
The lithium-ion battery is divided into two stages: the first constant current charging, to close termination voltage changed to constant voltage charging, the charging characteristics shown in Figure 2 as shown. This is a 800mAh capacity battery, its termination charge voltage of 4.2V. Batteries to 800mA (charging rate of 1C) constant-current charging, the battery voltage to start the larger the slope of the step-up, changed to 4.2V constant voltage charging when the battery voltage is close to 4.2V, the current is gradually decreased, the voltage change is not, 1/10C to the charging current is reduced (approximately 80mA), it is considered nearly full, the charging may be terminated (some charger to 1/10C after start timer, over a certain time after the end of charging). Lithium ion battery in the charging or discharging process the event of over-charge and over-discharge or over-current, will cause damage to the battery or reduce the service life.

Application Note:
Lithium-ion battery applications considerations in addition to the same with the non-rechargeable lithium batteries, in charge should also pay attention to the following points:

1. Lithium-ion battery 4.1V and 4.2V to terminate the charging of different varieties, charging 4.1V battery 4.2V charger can not be used, or there will be danger of overcharge (4.1V and 4.2V The charger with charger IC is different!)
2. Charge the battery, the ambient temperature can not exceed the temperature range listed in the table of product characteristics.
3. can not reverse charging.
4. Can not use rechargeable nickel-cadmium battery charger (charge three nickel-cadmium batteries) to charge the lithium-ion battery (rated voltage is 3.6V), but charging different ways, and easily lead to over-charge.

The discharge should note the following:
1. Lithium-ion battery discharge current can not exceed the maximum discharge current is given in the table of product characteristics. The discharge current is large, will produce a higher temperature (loss of energy), reducing the discharge time, and if the battery supplier is no protection element will overheat and damage the battery.
2. Discharge curve is different at different temperatures, as shown in Figure 5. As can be seen from the figure, at different temperatures, the discharge voltage and the discharge time is also different. -20 ℃ discharge situation worst.

In storage:
1. Battery if long-term storage, to be maintained at 50% state of discharge.
2. Batteries should be stored in a cool, dry bad environment.
To Keep away from heat, do not be placed in direct sunlight.

The image of the working principle of analogy:

Now the principle and mechanism of charging and discharging of the lithium-ion battery, the bubble phenomenon common life metaphor. The lithium-ion battery is like a bunch of soap bubbles, electrical energy stored within the bubble. When charging, the bubble will lengthen as the charging time is increasing, the bubble will burst when more than its limit, that damage the lithium crystal form, resulting in permanent damage.
When excessive discharge will cause bubble collapse and disappear, so the next charging bubble also charge it up, and caused the failure of lithium. How to inadequate control bubble burst and the bubble but the degree of collapse? Must be used to protect the circuit to be strictly controlled. Of course, the quality of batteries and precise control circuit can be greatly extended battery life.

The owners like to use lithium-ion battery, lithium battery self-discharge small, large capacity, superior performance. ]]> https://ameblo.jp/cpb2b/entry-11495812151.html Fri, 22 Mar 2013 17:38:33 +0900 Stepper Servo Motor to Achieve Efficiency Embroidery Machine High Speed and Efficiency

The high speed is the measure of the efficiency of an embroidery machine, embroidery machine speed, however, by electronic control system and control, mainly when large needle embroidery machine switching, the electronic control system to adjust its speed.

Maximum speed, minimum speed, switch needle length is used to describe the efficiency of the three parameters of the computerized embroidery machine, where the maximum speed and minimum speed determines the speed range of the embroidery machine, switch needle length determine the deceleration of the key pin length, because when the pattern required stitch length switching needle length will automatically slow down to accommodate the embroidery frame moves in place. Stepper servo motor supplier is achieved by raising the maximum speed, minimum speed and change the switch pin long embroidery machines, high speed and efficiency.

Traditional stepper motor driven computerized embroidery machine embroidery frame, the maximum speed is generally set at about 750 rev / min, when the needle is larger than 5mm, due to the limitation of the performance of the stepper motor, the electronic control system will automatically reduce the spindle speed embroidery frame to ensure sufficient time for the operation in place. Stepper servo motor is full closed-loop control, high speed, strong overload, output torque characteristics, used in the embroidery frame drive, greatly reducing the embroidery frame back and forth action required period of time, which makes the use of larger switching needle embroidery machine spindle can maintain a high speed, the motion characteristics of the embroidery frame smoother, quieter and enhance the efficiency of the embroidery machine. Stepper servo motor drive and motor integrated, smaller installation space, which also played the effect of reducing the cost and energy saving and environmental protection.
]]> https://ameblo.jp/cpb2b/entry-11485854766.html Fri, 08 Mar 2013 11:06:39 +0900
Cell phone, digital camera, PDA, etc. white LED backlight Blu-ray single-chip plus YAG fluorescence from. With the phone flash, medium and large size (NB, LCD-TV, etc.) display light source module, as well as special-purpose lighting system applications gradually increased. Next extended to be used for general lighting system equipment, high-power white LED technology (HighPower) the LED market will have become more obvious. The technical side, the biggest challenges have been encountered and to upgrade and maintain the brightness, if more to enhance its cooling capacity development potential in the market.

ASM has over two decades of experience in R & D and production automation optoelectronic component packaging equipment, the industry's current LED brightness method for a variety of upgrade to the packaging process, from the chip and package design level, to enhance the cooling capacity and increased luminous efficiency goals. In this paper, an overview and discussion on the latest developments and achievements of the LED packaging technology.

Chip design

Evolution chip found major LED manufacturers in the upstream epitaxial technical improvements, such as using different electrode design control current density, the use of the ITO film technology to make the current through the LED evenly distributed LED chip structure on as far as possible to produce up to photons. And then use a variety of different approaches to extracting a photon emitted by the LED, such as the production of the different shape of the chips; using chip peripheral effectively control the degree of refraction of light to improve the LED light extraction efficiency, developed to expand the surface of the single-chip size (> 2mm2) increase the luminescence area, more rough surface to increase light revealing. Pn two electrodes in high brightness LED chip position far closer, so that the luminous efficiency and cooling ability. Recently, high-power LED production is the use of new and improved laser to dissolve (Laserlift-off) and the metallic bonding the technology (metalbonding), the LED epitaxial wafer is removed from the GaAs or GaN crystal growth substrate , and bonding to another or other metal substrate having high reflectivity and high thermal conductivity of the material above, and to help the high-power LED to improve light extraction efficiency and cooling capacity.

Package design

After years of development the the vertical LED lamp (φ3mm, φ5mm) and SMD lights (surface mount LED) has evolved into a standard product model. However, with the development needs of the chip, and open up the the encapsulated products designed to meet the high-power, reduce manufacturing costs in order to take advantage of the automated assembly technology, high-power SMD lamps also came into being. Portable consumer products market, driven by the rapid, high-power LED packaging volume design smaller, the thinner to provide a wider design space.

In order to maintain the finished product in brightness after the package, the new and improved high power LED SMD devices plus cup-shaped reflecting surface will help consistently to all light reflected off the outside of the package in order to increase the output lumens. Cover the LED on the circular optical lens , superior materials change for Silicone sealant instead of epoxy resin (Epoxy) package can maintain a certain durability.

Packaging process and programs

The main purpose of the semiconductor packaging to ensure that between the semiconductor chip and the lower circuit correct electrical and mechanical connecting with each other, and the protection chip to prevent subjected to mechanical, thermal, moisture and other external shocks. Select the encapsulation method, materials and use of the machine to be taken into account the factors of LED epitaxial shape, electrical / mechanical characteristics and solid crystal accuracy. Its optical properties due to LED package to be considered and to ensure that its optical properties can meet.

The vertical LED or SMD LED package, must choose a high-precision Bonder precise position of the LED chip into the package or not directly affect the luminous efficacy of the whole package devices. Shown in Figure 1, if the position deviation of the chip within the reflective cup, the light has not been fully reflected to affect the brightness of the finished product. However, if a solid crystal machine has advanced pre-image recognition system (PRSystem), despite variations in quality lead frame, can still accurately welded to the the reflective cup predetermined position.

General low power LED devices (such as the pointing device and the phone's keypad lighting) in Silver solid crystal, silver paste itself can not withstand high temperatures, at the same time enhance the brightness fever phenomenon will produce, thus affecting the product. To obtain high quality, high power LED, a new crystalline solid process along developed, wherein one is the use of the eutectic soldering techniques, the first die-bonding at a heat radiation substrate (soubmount) or heat sink (heatsink), and then the whole chip with heat dissipation substrate is then welded to the packaged device, so you can enhance the cooling capacity of the device, so that the relative increase of the luminous power. As for the substrate material, silicon (Silicon), Cu (Copper), and ceramics (Ceramic) are commonly used heat radiation substrate materials.

Eutectic solder

The technology most critical is the choice of materials and welding of the eutectic temperature control. Generation of InGaN high-brightness LED, such as eutectic soldering, the chip may be used at the bottom of the contact surface coating of pure tin (Sn) or gold-tin (Au-Sn) alloy as the chip is plated with gold or silver on the substrate can be welded to. When the substrate is heated to a suitable temperature of the eutectic (Figure 5), the penetration of gold or silver element to the gold-tin alloy layer to improve the melting point, the change in the composition of the alloy layer, the layer is cured and LED fastening eutectic solder in hot sink or on a substrate (Figure 6). Select the eutectic temperature of the chip depending on the heat level of the substrate and device materials and subsequent SMT reflow process temperature requirements. Consider eutectic crystalline solid machine, in addition to the high positional accuracy, another important condition is to have a flexible and stable temperature control, plus a nitrogen gas or a mixed gas apparatus, help in the process of eutectic oxidation protection. Course solid crystal and silver paste to achieve the high-precision solid crystal, depends on rigorous mechanical design and high-precision motor movement, in order that the movement of the welding head and welding force control more than just right, without compromising the high productivity and high yield requirements.

Flux can also be added for eutectic soldering processes, the biggest feature of this technology there is no need for additional welding force, and therefore not solid crystal welding force is too large, too much eutectic alloy overflow to reduce the opportunities generated by the LED short circuit .

Flip chip (FlipChip) Welding

Flip chip welding and has been actively used in the process of high power LED, flip chip method the GaNLED chips fell bonded to heat the substrate, gold wire pad hindered some help to increase the brightness. Shorten the distance of the current circulation, reduce resistance, so the heat generated is relatively lower. Such bonding is also effective in heat go to the next level of heat dissipation substrate and then go to the device outside. When this technology is applied in SMDLED not only to increase the light output, the more you can make the product as a whole area of ​​narrow, expand the product's application market.

Flip-chip LED technology development, there are two main options: First, the solder ball the welding (Solderbumpreflow); thermosonic (Thermosonic) welding technology. Solder ball welding (Figure 10) in the IC packaging applications for some time, technology has also matured, do not go into details here.

The number of devices for low-cost and low-line production, heat ultrasonic flip chip technology (Thermosonicflipchip) (Figure 11) is especially suitable for high power LED soldering. Gold welding interface design process in the solid crystal gold this thing melting temperature than tin-lead ball and silver paste, more flexible. In addition, lead-free process, the process is simple, reliable metal pick-bit, etc.. Thermal ultrasonic flip chip technology after years of research and experience accumulated, has mastered the optimization of process parameters, and successfully put into mass production in several major LED manufacturers.

Foot production line, a lot of automation equipment (such as chip bonder, wire welding machine, test machine, taping machine), but also all rely on imports.

Specific proposals for development of LDD equipment industry

Suggested the country in support of the LED technology and industrial development, materials and process equipment to support it as a basis for the development and the driving force behind. In the process of the development of LED technology and industry, it is recommended that China take the introduction, digestion, absorption, innovation, improve roads. Specific programs as follows: in the country, supported by the national LED manufacturers and equipment and materials manufacturing tripartite joint establishment of the incubator function LED equipment, materials, manufacturing and application of the Commonwealth.

Mastered in a short period of time and improve equipment manufacturing level, the the driven LED industry development of China's high-grade recommended by the Commonwealth of co-financing (50% of the country, 15% of the equipment research and development unit, chip manufacturing and packaging technology research units 15%, LED chip 20%) of the construction of a complete LED chip manufacturing and packaging demonstration production line manufacturing and packaging companies. The model line to solve the equipment development and process test LED product manufacturing process technology research and validation sets supply of technology and process equipment. The units involved in the construction of the demonstration, the right to free use of the production line related products, technology and the industrialization of research and test, especially LED production units Preferential get the outcome of the research and industrialization.

The model line, the implementation of the three-step strategy, and ultimately the commercialization of LED production equipment and localization (to see equipment localization program Table II). The first step: the use of about two years, and the localization of some key equipment (countries grant some bonus support); domestic has a certain foundation and the use of common equipment with a cost advantage principle of market competition, take the access system merit-based matching part is difficult, the localization devices can not in the short term, the country should arrange the research, and the completion of the production? prototyping (through the development of standards); Second step, starting from the third year of the implementation of the program, the first step involves the first two types of devices focused on solving the adaptability of the production process, production efficiency, reliability, appearance and cost, with supporting domestic and bulk supply capacity and the research class equipment to complete production prototype development of commercialization (γ-machine). Third step, from the first five years of implementation of this program, the first and the second step involves all equipment with international competitiveness, in addition to meet domestic demand, to occupy certain international markets; research equipment to meet the industrialization production requirements and have the bulk supply capacity. ]]> https://ameblo.jp/cpb2b/entry-11480993801.html Fri, 01 Mar 2013 11:25:58 +0900
Seagulls for inspiration, give full play to the characteristics of LED slim light and elegant design flying shape. LED's low-temperature, energy-saving, security design, continues QisDesign designers has been the nature of care. Seagull lights also can be with you the interaction of light and shadow, light body, the front and rear ends of each set rotary knob. Gently rotate the side of the knob, you can adjust the light shade; other side of the knob is used to adjust the angle of illumination, to show a variety of wings and taking flight posture to meet the different needs on the read or mood lighting use. The design uses a unique light guide technology, so that the LED light source on the wings evenly emit soft light, highly pure, refined, elegant design, add higher taste for the modern home life.





The NUDE plant lighting LED table lamp

The modern city people from nature, both want green lighting, green potted plants, known as the "Green Lantern" Table Lamp with Green Lantern with the same name from the Italian design company NuDe the table lamp design originality, the shape of the corners shape design the sharp corners Hide thin linear LED light source, providing high-quality energy-saving and healthy lighting, flat end of pot planting pots can also be used, both harmonious combination of the perfect curve streamlined fashion. The lamp body part can be rotated 360 degrees, there are a variety of options to adjust lighting direction, material and color according to your needs, and home with even more flexibility, learning table lamps under tired, take a look at the green plants, but also A good swap.






Source from: http://dualsimcellphone.yoka-yoka.jp
]]> https://ameblo.jp/cpb2b/entry-11476099458.html Fri, 22 Feb 2013 17:05:24 +0900 LED desk lamp booth attracted not the eye of small businesses, many businesses have gathered to watch inquiry. Emperor wolf photoelectric CEO Jing Yan days to listen carefully to the side can feel his deep eyes Jing total has fallen into deep thought. To learn more about the Emperor wolf photoelectric, correspondents the Emperor wolf photoelectric CEO Jing Yan days to do an in-depth interview.

Industry Background: gorgeous turn from the mobile phone industry to the LED lighting industry

Emperor wolf photoelectric predecessor is not in the LED industry, but belong to the mobile phone industry. Jing always said, the Emperor wolf photoelectric preliminary in the mobile phone industry is the industry leader in the mobile phone industry in Shenzhen in 2007, has been done in the top five. There are so gorgeous predecessor, Jing always feel very proud, Jing total, said the mobile phone industry is the digital electronics industry, high technological content of products, innovative ideas and avant-garde design, advanced management concepts, these technologies, design and management concepts reserves so Emperor wolf photoelectric beginning to enter the LED lighting industry stood on a high platform.

Jing said the total on the R & D team, the Emperor wolf photoelectric inheritance before the advantages of the mobile team, bringing together the industry elite group of LED optical, thermal, mechanical and digital electronic technology, the formation of a compound of the R & D team . Emperor wolf photoelectric currently working employees a total of 260 people, there are more than 50 of the R & D team, accounts for almost a fifth of the company's total number of employees, so the proportion of R & D personnel in the industry is difficult to see. Meanwhile, Emperor wolf photoelectric sound industrial chain configuration, in addition to the assembly plant, toolmaking factory, hardware factory, light guide plate factory downstream supporting enterprises, Jing always said, and before the Emperor wolf photoelectric in the mobile phone industry the complete supply chain resources more important Dili wolf photoelectric its inception to increase the construction of basic facilities. Jing total also revealed that Emperor wolf photoelectric strong capital advantage in the LED lighting industry has invested sufficient funds to ensure that the enterprise infrastructure to ensure the quality of the product development.

Brand-building: Focus LED lamps, to create a domestic table lamp first brand

Di wolf photoelectric adhering to the design philosophy of digital electronic products, launched a series of products in keeping with the times the pace to meet the fashion needs of consumers. 2012, Royal Wolf launched a total of learning to read, business office, gifts, home decoration, four series of 22 new models table lamp, which is mainly to learn to read series, both part of the business office and gift series; variety of table lamps products are simple, bionic shape and elegant quality touted by consumers.

Many market segments in the field of LED lighting, such as LED lights, LED tunnel lights, LED bulbs, why Emperor wolf photoelectric happens in love with the LED table lamp it? Jing introduced said, before the Emperor wolf photoelectric also try the done lighting products such as LED lights, LED tunnel lights engineering, engineering lighting products are not a high degree of market and commercialization of this type of furniture, lighting, LED Lamp Emperor wolf photoelectric good at the market, commercialization, marketing, Emperor wolf the photoelectric decided only to focus on familiar territory, determine education green LED lighting as the development direction of the company's core and the creation of the "right light" brands " comfortable experience light "brand philosophy, determined to create the world's leading brand of LED table lamp. Jing total also added furniture lighting easier standardization and large-scale production, like engineering lighting products, such as the one bulb, it is not standardized, each different customer requirements, resulting in high production costs, the popularity of the difficulties. Based on the above reasons, the Emperor wolf photoelectric cut some product lines, and only focus on the development and production of LED lamps, has grown to the largest LED desk lamp production, manufacturing, sales enterprises.

Royal wolf photoelectric products focus on LED lamps, LED technology has been profound precipitation. Jing said the total, Emperor wolf photoelectric has a strong R & D strength, the current Emperor the wolf R & D team has broken through the 70 patents, of which there are more than 30 of the LED light source technology patents. Meanwhile, Emperor wolf the photoelectric is the only one to get the German light Biosafety verification table lamp enterprises, in the side of the light-emitting soft LED light source technology has reached the Class 2A standard in Japan. The basis of these technologies Emperor wolf photoelectric sufficient lung power to create the first brand of LED table lamp field, on the road to enter the international market, to build national brands with confidence.

Century enterprises rely on culture, Jing total on our interpretation of the corporate culture of the Emperor wolf photoelectric. As her name suggests, the corporate culture of the Emperor wolf photoelectric wolf culture as the core - closely united, the goal is clear, coordinated operations, reflecting the focus of professional, does not meet the target will never give up the fighting spirit. It is under the influence of the corporate culture of the wolf, the emperor wolf photoelectric be able to rapidly changing roles, professional, dedicated, loyal into the design of the LED lamps, production, sales, and has steadily grown.

Looking to the future: optimistic about the prospects for LED lighting steadily building market

Many LED companies, Emperor wolf photoelectric also very optimistic about the prospects for the LED lighting market. The wattle total LED industry is a sunrise industry, government support, continue to make breakthroughs in technology, consumer demand, the industry will become increasingly large, the market will be getting better and better. The government has increased subsidies for LED lighting, many companies are enjoying government subsidies. Jing always thought that the government's policy support, government financial subsidies, this is a good thing, but if a business is said to rely on government support, government subsidies to development, which is not fly. The wattle total calls for peer companies going to build their own core competitiveness, enhance the technical level of the industry really up to jointly establish a sound development of the market environment.

In the market building, Jing always said Emperor wolf photovoltaic market strategy is to proceed step by step, first lay a field, lay a good place, and then break through another area, another place. Emperor wolf photoelectric only focus on LED lamps products, to create the first brand of domestic LED lamp thorough understanding of this area and then consider other areas. The Jing Emperor wolf the photoelectric do market Emperor wolf photoelectric accounted for 70% of the share in the international market share in Japan, North America accounted for 30% of the share market total. Jing always said the emperor wolves the photoelectric select export market is not the same as with other companies, they choose the country is carried out one by one according to their strategic breakthrough, Japan so thoroughly do in North America, and North America so thoroughly do in Europe, and Europe to do thoroughly do the Middle East ...... Emperor wolf photoelectric without nets fishing style strategy, where customers do where the market; but to identify the target, and then vigorously developed, thorough understanding of the market, and then to develop other markets.

Services for customers, Jing always said, Di wolf photoelectric adhering to excellence, dedication to provide customers with system services, the purpose of creating value for customers. Emperor wolf photoelectric not only provide customers with a mature product, and also offers system solutions. Jing total for example, in cooperation with well-known household electrical appliance enterprises, and lighting companies Di wolf photoelectric will for the company's corporate culture, brand identity, market strategy to tailor a product line; When the product is not suitable for the customer's brand when Emperor wolf photoelectric not OEM to the customer, but to provide customers with a full set of new design Emperor wolf photoelectric win the trust of many customers and industry reputation. In the first half of 2012, Emperor wolf start a big brand strategy, set up a Ministry of e-commerce, international business, OEM, direct marketing, domestic channels, and KA Ministry six marketing platform. Steady development through six marketing platform, Emperor Wolf photoelectric products have formed a good reputation, the construction of the domestic channels, around the outlets, the lead also.

Jing total also give us the Emperor wolf photoelectric corporate vision. One vision: to build the leading brand in Guangdong, the Hunan Hunan entrepreneurs in the Guangdong region leading brands. Timor wolves the photoelectric take Hunan people daring to fight the Ganpin fighting spirit manifested, and go into the enterprise, companies stand out in the fierce competition; Vision II: the enterprise into a truly modern operators public enterprises, such enterprises is not a family business, the whole of society Recruitment enable enterprises to achieve modernization of the public; Third vision: LED table lights segments really made the national brand in the world market can and Philips, Osram these international brands to compete on the same stage.

]]> https://ameblo.jp/cpb2b/entry-11460650009.html Thu, 31 Jan 2013 15:14:51 +0900 The light-emitting diode (LED) birth date, full color and high brightness, and developed on the basis of the blue LED and violet LED white light LED. The history of it is the general term for man lighting brings a Pentium. From incandescent lamps and fluorescent lamps, LED with its small size, all solid, long-lived life, environmental protection, energy saving, and a series of advantages, has been widely used in automotive lighting, decorative lighting, phone flash, medium and large size, that is NB and LCD. The light source module such as a TV display.

The 2l centuries of the most promising high-tech areas has become one of the LED is a injection electroluminescent light emitting devices. Ⅲ ~ Ⅳ aromatic compound, such as phosphating gallium (GaP), gallium arsenide phosphide (GaAsP), a semiconductor made ​​of the electric field under the action of the ~ I-DN. The electrostrictive effect which occurs in the radiative recombination of electrons and holes will be part of the energy is converted to light. Quantum effects, without radiative recombination gave birth to the occurrence of lattice vibrations to the rest of the energy is converted into heat. Now, high-brightness white LED in the laboratory has reached a level of 1001m / W 501m / w power white LED has entered commercialization, a single LED devices jumped from the first few milliwatts 1,5 kW. Greater than 1W-level high-power LED, the eras of electro-optical conversion efficiency of about 15%, and the remaining 85% is converted into heat. The chip size is only 1mm × 1mm ~ 2. 5mm ~ 2. 5mm. Means that the power density of the chip different from the conventional lighting device, the emission spectrum of the white LED is not included in the infrared part. So its heat can not rely on the release of radiation. Therefore, how to improve the heat dissipation capability is one of the high-power LED to achieve industrialization key technical problems to be solved.

2. Thermal effects of high-power LED
In terms of a single LED. If the thermal energy is concentrated within a small chip size can not be effectively dissipated. Will lead to the elevated temperature of the chip. The thermal stress caused by the non-symmetry distribution chip light emitting efficiency and phosphor lasing efficiency decreased. The study shows that when the temperature exceeds a certain value. The failure rate of the device will show a climb exponentially. Component temperature rise 2 ℃, reliability will drop l0% l. Order to ensure the lifetime of the device, generally require pn junction temperature below 110 ℃. Followed by the temperature rise of the pn junction. Redshift data count data show that the emission wavelength white LED devices. In the 100 ° C the temperature. The wavelength can redshifts 4 ~ 9 nm. Thus lead to the YAG phosphor absorption rate, total luminous intensity cut, white chromaticity worse. Similar at room temperature, the temperature is increased by 1 ° C. LED luminous intensity will be a corresponding reduction of about l%. When the device is increased from ambient temperature to l20 ℃. The brightness decline by as much as 35%. When the multiple LED set them in intensive constitute white light illumination system. More serious heat dissipation need someone to answer questions. Prerequisite to solve the heat has become a power LED applications need someone to answer questions.

3. Domestic and foreign research progress
For high-power LED package heat dissipation problems. By default, the device at home and abroad and manufacturers in terms of layout, materials and workmanship the device thermal system optimized default. For example. Flip-chip package layout, accepted a large area layout, metal circuit board layout, the thermal trough layout, microfluidic array layout; material selection, choose a suitable substrate material and adhesive materials instead of epoxy, silicone resin resin.

3.1 Package layout

Acquaintance decision of high-power LED package heat dissipation problems, the international development of a variety of layout are:

(1) Silicon flip-chip layout (FCLED)

The traditional LED acceptance suits layout, the above typically coated with a layer of epoxy. Below accepted sapphire as a substrate. Since the poor thermal conductivity of the epoxy resin. Sapphire is a poor conductor of heat, and heat can only rely on the chip below the pin shed, before and after the two are caused by cooling difficulties. Affect the performance and reliability of the device.

In 2001. LumiLeds company developed A1GaInN power flip-chip layout. Figure 1 shows a chip being installed layout and flip layout collation LED chip connected by a bump flip to the silicon. So. High Power LED breeds heat does not have to occur via the chip sapphire substrate. But directly to the higher thermal conductivity of silicon or of ceramic substrate, and then spread to the metal base, due to its active heating zone closer to the cooling body. Therefore, to reduce the internal thermal resistance of the heat sink 21. The thermal resistance of this type of layout views calculating the minimum can be achieved 1. 34K / W. Actually done 6 ~ 8K / W, the light exit rate also increased about 60%. However, the thermal resistance of the heat sink thickness is directly proportional. Therefore limited by the the silicon mechanical strength and thermal conductivity. Difficult by thinning wafers to further reduce the thermal resistance of the internal heat sink, which restricts further improve its heat transfer performance.

(2) The metal circuit board layout

The metal PCB layout using aluminum and other metals with excellent thermal conductivity temper. PCB board of the PCB board of the chip package to a copper electrode that is covered with a few millimeters thick, or the chip is encapsulated in the metal sandwich. Then encapsulated into the heat sink, in order to solve the heat dissipation of LED power increases need someone to answer questions. Acceptance of the layout was suffering from a good heat dissipation characteristics, and greatly improve the input power of LED.

The U.S. the UOE company Norlux series LED. Packaged products assembled in the metal core PCB with aluminum sandwich panel. Herein PCB board is used as the electrode connection wiring of LED devices. The aluminum sandwich As a heat sink cooler. Figure 2 shows the metal circuit board layout. Its defect is that the dissection of the PCB is a poor conductor of heat. It will hinder the heat conduction. According to the research, the OSRAM company Golden Dragon series white LED chips LW W5SG flip in of a 3ram to 3mm. And horizontal placement of the metal circuit board, in the LED devices and between the metal circuit board, the thermal interface material of the coating 1898In-Sil 8, the system thermal resistance approximately 66. 12K/Wt ".

(3) The layout of the micro-pump

Sheng Liu et al in 2006 through a micro-pump system installed on the radiator solve LED heat need someone to answer questions, and invented its thermal performance is superior to the heat pipe and heat sink. In the closed system, water, under the action of the micro pumped into the LED's bottom groove small endothermic and a small water container, and then returned, and then by a fan endothermic. Figure 3 shows a layout of the type of micro-pump. It can be external thermal resistance reduced to O. 192K / W. And encapsulation [41. Preferably of such layout of the micro-pump refrigerant. However, if the first two layout, the internal interface thermal resistance, the thermal conductivity is compromised. And the layout is too complex.

3.2 Packaging materials

After determining the package layout. You can select different materials to further reduce the system thermal resistance, improve system thermal performance. Now, at home and abroad often substrate materials, adhesive materials and packaging materials merit.

(1) Substrate material

For high-power LED acquaintance decision between the chip and cooling materials due to heating and expansion mismatch caused by the electrode lead off the need to answer the questions. Optional of ceramic, Cu / an Mo plate and Cu / W board alloy is used as the heat sink material, but the production cost of these alloys is too high, and not conducive to large-scale, low cost production. The choice of good thermal conductivity of aluminum plate, copper plate as a heat sink substrate material is the focus of current research circle.

(2) Adhesive materials

Appropriate choice of the chip substrate adhesion material. And in the batch production process to ensure adhesion to a thickness of as small as possible. This to guarantee the thermal conductivity characteristics of the device is very important. Is usually used three kinds of thermal plastic, conductive silver paste and tin pulp material adhesion. LED devices although lower hardening temperature thermal plastic packaging material. Having excellent electrical insulating properties, adhesion and dielectric properties, but the epoxy resin having a hygroscopicity, aging, poor heat resistance, high temperature and shortwave light, easy to change color, and before curing has some toxicity, so the LED devices the life of the impact. Eras LED packaging industry to switch to silicone and porcelain pottery instead of epoxy resin as a packaging material, in order to improve the life of the LED.

3.3 Summary

Overall. The layout of the new package with low thermal resistance, good heat dissipation ability and low mechanical stress is a key technology for the package. The chip junction layout and materials need to be addressed to the epitaxial layer epitaxial layer to the package substrate, package substrate cooling need someone to answer questions to the three aspects of the cooling device. By these three links constitute the heat conduction path of the solid-state lighting source. Which emerge any weak links will make the LED light source destroyed. Junction to ambient thermal conductivity style pattern of conduction, convection, radiation three kinds. This means, in order to enhance the thermal performance and reliability of the power LED to the highest. The three link must accept high coefficient of thermal conductivity of the material.

4. Trends

Eras. Power type LED drive current can be up to 70mA, lOOmA even lA level. Followed the work of the current increase cooling needs someone to answer questions has become a prerequisite for high-power LED to achieve industrialization. In accordance with the aspects of the heat dissipation of the LED device. From the following aspects to improve the thermal performance of high power LED.

(1) LED produce heat, depending on the internal quantum effect. Among the GaN growth process, improved material layout. Optimizing the growth parameters, was suffering from high-quality epitaxial wafers, device internal quantum efficiency, to cut heat gestation occurred from the foundation, to speed up the chip junction to the thermal conductivity of the epitaxial layer.

(2) select the aluminum-based metal core printed circuit board (MC-PCB), of ceramic, DBC, a composite metal substrate such as a good thermal conductivity material used as the substrate, from the epitaxial layer in order to expedite thermal energy circulated to the heat radiation substrate. MCPCB board by optimizing the thermal default. Or porcelain pottery directly bind to the metal substrate to form a metal-based low-temperature sintering of ceramic (LTCC-M) substrate to be suffering from the thermal conductivity performance. Heating the small expansion coefficient of the substrate.

(3) In order to make the heat energy on the substrate more rapidly profile sheets to the surroundings. Usually chosen good thermal conductivity metal material of aluminum, copper, etc. as a heat sink. Plus compulsory cooling mounted fan and loop heat pipe. Both from the point of view of cost or appearance. LED lighting should not accept external cooling device. Therefore, in accordance with the law of conservation of energy, the use of piezoelectric ceramic pottery as a heat sink, heat vibration style pattern directly into thermal energy consumption will become one of the focus of future research.

(4) For the high-power LED devices, the total thermal resistance is the pn junction to ambient thermal several heat sink thermal resistance and on the road, including the Conceiving LED itself internal heat sink thermal resistance, the internal heat sink to the PCB thermal plastic thermal resistance between the thermal resistance of the thermal glue between the plate, PCB board with an external heat sink, an external heat sink thermal resistance, etc., the heat transfer loop in each of a heat sink on the heat transfer will cause some obstacles Thus, too long-term studies that. Reduce the number of internal heat sink, and acceptance of thin film technology will be essential interface electric hot Shen, the insulation layer is built directly on the metal radiator. Able to significantly reduce the total thermal resistance. Such technology has the potential to become a mainstream After high-power LED cooling package direction. ]]> https://ameblo.jp/cpb2b/entry-11455127629.html Wed, 23 Jan 2013 15:24:29 +0900 SMD LED assembly, so that the thickness of the product is only the thickness of a coin, does not occupy space; universal specifications 30cm long 18 LED, 24 pcs LED 15 LED 50cm long, 24 pieces of LED, 30 pieces of LED . There are 60cm, 80cm, different users have different specifications. And it can cut, can be arbitrarily extended luminescence is not affected. FPC soft material, can be bent, folded, winding, and will not break free to move in three-dimensional space and telescopic. Suitable for irregular and narrow space, but also because of its curved and winding can be arbitrary, any combination of a variety of patterns suitable for advertising decoration.

2. LED rigid strip light PCB hard board assembly circuit board, the LED useful SMD LED assembled also useful for assembly line LED, as needed, while the use of the different components. Fixed advantage of hard light bar is relatively easy processing and installation are relatively easy; disadvantage is not at liberty to bend, not suitable for irregular. Rigid LED Strip with SMD LEDs 18 LED 24 pieces of LED, 30 pieces of LED, 36pcs LED, 40 pcs LED variety of specifications; the DIP LED 18, 24, 36, 48 different specifications, have a positive side, also known as the Great Wall of side-emitting light bar.

LED lights with production therefore launched this project because the threshold into the low, a lot of people. But the experience still have a way to identify formal manufacturers to produce LED lights with LED lights with cottage version (meaning depends on manual work products produced in the rental) from the appearance, at a glance out.

1. See the solder joints. Regular LED lights with manufacturers to produce LED lights with SMT LED chip technology, production of solder paste and reflow process. LED lights to bring the solder joint is relatively smooth and the amount of solder will not solder an arc to the LED at the electrode extends from FPC pads. Amount of solder joints cottage LED lights with uneven, mostly a dot wrap welding foot, at the same time there will be varying degrees of icicles, which is a typical phenomenon of manual welding.

2. See FPC quality. FPC sub copper and rolled copper two Bonded Copper foil is projecting a closer look, then look out from pad with FPC connection. Rolled copper is close and FPC as a single entity, and can be bent without pads off. Bonded Copper if bent too much appears pads off, maintenance when the temperature is too high can also cause the pads off.

3. See LED lights with the cleanliness of the surface. If the LED lights with SMT production, surface cleanliness is very good, and do not see any impurities and stains. However, if the use of hand-welding process production cottage LED lights with its surface no matter how cleaning will be residual traces of stains and cleaning, the FPC surface at the same time there will be flux and tin slag residue.

4. Look at the packaging. The regular LED lamp with trays packaging, antistatic volume generally 5 m roll or 10 meters a roll, and then the outside and then anti-static moisture-proof bags sealed. Cottage version of LED lights with cost recycling volumes trays, then no antistatic moisture-proof bags, look carefully roll trays can see the appearance of clear labels left marks and scratches.

5. Look at the label. Regular LED lights with bags and roll trays above will print labels instead of printed labels. Cottage version of the label is printed, specifications and parameters are not unified.

6. See Annex. Regular LED light strip will be enclosed inside the package instructions and lamps with specifications, while also equipped with LED lights with connector or deck; cottage version of LED lights with box without these accessories, because Some manufacturers, after all, could save the province. ]]> https://ameblo.jp/cpb2b/entry-11450373483.html Wed, 16 Jan 2013 16:43:47 +0900