LED gradually replaces the traditional incandescent lamp to the backlight and lighting market applications. Compared with the traditional incandescent light source LED, LED has many advantages. LED has long service life, high efficiency, is not easy to damage, contains no mercury, does not produce toxic gas, consumes electricity. The low-volume... characteristics, LED is nothing but the best light source alternative for our environment, and LED is known as the new light source of the 21st century.
Fiber Optic Splice Closure is mainly used for protecting the fiber optic junction between two cables and reserve a section of fiber optic for maintenance in the box. The box has good leak-proof, anti-water and damp-proof feature and its power line is corrosion resistant. Fiber Enclosure,Fiber Enclosure Outdoor,Optical Vertical Closure,Optical Inline Closure Chengdu Xinruixin Optical Communication Technology Co.,Ltd , http://www.xrxoptics.com
In the LED manufacturing process, the package is very important part, the role of the package outer lead is connected to the electrodes of the LED chip, not only to protect the LED chip and improve the luminous efficiency. Therefore, the LED package not only completes the output electrical signal, but more importantly protects the die from normal operation and outputs visible light. However, no matter which kind of LED needs to be designed for different types of reasonable packaging, it can be put into practical use.
With the different application methods of LEDs, the heat dissipation scheme and lighting effect as well as the appearance and size will also be changed. According to the LED package form, it can be roughly divided into Lamp-LED, TOP-LED, Side-LED, SMD-LED, High- Power-LED, Flip Chip-LED... and other six categories.
In the entire LED industry chain, the package is the upper part of the package. The traditional low-order LEDs are mostly used for outdoor display billboards or indicator lights. The packaging materials are selected as liquid epoxy resin. With the LED turning to indoor lighting and backlight applications, high power and high. Brightness has become the focus of LED development. High-power LEDs must reduce shadowing, increase light transmittance and enhance the utilization of light refraction and reflection. From the bare crystal to overcome the brightness problem into the package, the packaging process! How to maintain the highest light transmission, Attenuation of light to a minimum is critical.
In the past, the most commonly used packaging material for LEDs was epoxy resin. The epoxy resin packaging process is relatively simple and low in cost. Therefore, the current market share of LED packaging materials is high, but the disadvantages are low impact damage resistance and poor toughness. The heat resistance is less than 170oC. After aging, the benzene ring component will gradually turn yellow, which will affect the bright color. In particular, the lower the wavelength, the faster the aging. In particular, some white light-emitting diodes use near ultraviolet light and other visible light. It ages faster than its wavelength. Therefore, in order to cope with the aging problem caused by the thermal energy generated by high-power LEDs, the choice of packaging materials should consider the silicone with high heat resistance as the packaging material.
The use of silicone instead of epoxy resin has a higher lumen retention (Transmittance, transmittance, transmittance, expressed in percentage units), such as Lumileds's Luxeon series of LEDs in the United States is the use of silicone sealant, other companies are also There are silicone sealing solutions, such as Momentive's InvisiSi1, Toray. Dow Coring Toray, Japan's Shin-Etsu Chemical's KER-2500AB, etc. are also LED's silicone packaging solutions.
There are two types of the junction box, central and terminal one. The central type is used in the central part if the line to protect the tow butted cables while the terminal type is used in the end of the line for branching in the cable line or protecting the connection of the fiber optic in the cable and the jumper.