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discuss the composition of several parts of led torch

 

    Below, respectively, is to discuss the composition of several parts.

    Can be seen from the table, an important way of heat radiation, oxidation treatment is to improve the metal material. Thermal conductivity of plastic you do not need any oxidation treatment can achieve a very high coefficient of radiation. So long as the shape and metal radiator, convection and radiation effects and the effect of the metal radiator is the same. But its thermal conductivity is certainly not as good as the metal, the overall cooling effect will be worse. But if it did as thin as possible, plus a layer of metal is wall, the disadvantage of low thermal conductivity to a minimum. Thermal conductivity greater than 20w/mk plastic, but its price is relatively high. Ceramic radiator and plastic is radiator. Is only the thermal conductivity can be done, of course, have a much higher cost. Figure 10 is a 6W plastic housing Bulb, Long Mao microelectronics company in Shanghai. The heat sink temperature is 67 degrees.

 

Figure 10 a 6W plastic radiator CREE flashlight

    The biggest advantage of plastic and ceramic insulation is right, so even with non-isolated power supply through the safety inspection.

    In addition, in order to improve the cooling of the constant current drive power of the blister, usually have to join the thermal conductivity of the sealant to replace the poor thermal conductivity of air. Another method is to punch in the radiator so that air circulation. But there will be waterproof.

    V. Bulb lights blister

    The so-called blister refers to the transparent front of the glass bulb. Incandescent lamps, all made from glass, shell, but in a Light Bulb, although can also be made of glass in front of the shell, actually do so. CREE flashlight, heavy weight, than the incandescent weighing more than 5 times, if the glass, fall to the ground, smashes the possibility of most. More CREE flashlight is with a plastic bubble shell, to prevent broken. CREE flashlight heat of the infrared heat from the radiator are scattered out, so the by Ever bright blister are visible, very few, so the plastic to do the blister will not be damaged due to overheating.

    But the biggest problem of the plastic shell is the transmittance. LED Flashlight glare problems, so as far as possible the milky foam shell, so as not to see the inside of the LED lamp. Milky white blister is very well. Their transmission rate is even more problematic. So for the plastic used for CREE flashlight blister the following requirements:

    A high transmittance, high diffusion, no glare, no light and shade;

    2 concealed light source is better (as far as possible do not see the LED lamp);

    (3) The transmission rate of 90%;

    (4) With high flame resistance;

    With high impact strength;

    Now a called the Zigzag LED optical shade said to be able to achieve all the above requirements (Figure 11).

 

Figure 11 kinds of LED plastic blister

    And if they really can achieve 94% transmittance, and glare-free lighting, it really is very ideal. Its appearance is shown in Figure 12.

Hits:  UpdateTime:2012-07-13 13:47:00  【Printing】  【Close