Next, Xinzhao photoelectric small series to give you a detailed introduction
Since 1990s, science and technology have been developing upward. The manufacturing methods of light guide plates have been improved gradually, which leads to different printing styles and early printing styles. In contrast, we call it "non printing type".
Ejection molding
It fills the melt forming material into the closed mold by high pressure, which requires the smooth guide plate and microstructure to be completed simultaneously in the ejection molding, and the mold must be made quite firmly, so the mold price is also very expensive, so it must be produced in large quantities to offset the high cost of the mold. The single-sided micro structure array light guide plate is usually made by shooting forming. The texture structure of its bottom can be micro lens shape, micro circle sphere or tetrahedral corner cone prism shape.
Photolithography
Lithography is to apply a layer of corrosion-resistant photoresist on a flat silicon sheet, and then make the strong light through the lithography plate, and selectively expose it according to the graphic information of the specific layer; Then the photoresist is removed after development, and the film with micro graphic structure will be left on the surface of the silicon wafer. The surface roughness of the light guide plate made by lithography is not good, and the loss of light energy is relatively large.
doping
A transparent particle material with scattering function is injected into the light guide plate directly during the injection molding of the light guide plate. The effective control of the light output can be achieved by adjusting the concentration of the transparent particles reasonably, and finally the high uniformity of the light output can be achieved. Because the doping process is not easy to control accurately, it is suitable to make small and medium size light guide plates by injection molding, and the problem of uneven light will appear for large-size light guide plates.
Laser engraving
Laser carving is to control the energy and position of laser head strictly by computer according to the program requirements. The micro structure array with certain size is depicted on the back of the light guide plate by gasification. This method can control the depth of scattering structure accurately, but the efficiency is very low and it is not easy to mass production.
Sandblasting
The rough distribution of the mould is transferred to the light guide plate when the injection molding is made by sand blasting. The more rough surface, the stronger the scattering ability, and the uniform distribution of light is achieved by adjusting the rough distribution of the surface reasonably.
Single point diamond processing
Single point diamond processing is also called nano processing technology, and its processing precision can reach the surface roughness of nanometer level. It is fixed on the precision lathe, and the natural single crystal diamond tool is used for fixed point turning. Firstly, the guide plate core is fixed on the rotary shaft to rotate, and then it is made by the rapid piezoelectric feed of diamond fast knife. The concave convex lens of the light guide plate is processed by the fast knife feeding system and equipped with ultra precision single point diamond equipment.
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