Several common high-power LED lens materials are: PC, PMMA, silica gel, glass, etc., which are described below.
First, high power LED lamp bead PC lens:
Optical grade material Polycarbonate (PC for short) polycarbonate. Plastic materials, with high production efficiency, through injection molding, extrusion to complete the production. The product has the advantages of light weight, anti-fall and low cost, and the transmittance is slightly low. The penetration rate is about 89% when the thickness is 3mm. At the same time, the temperature resistance of the material is not too high, the temperature cannot exceed 110°, and the thermal deformation temperature is 135 °. At present, the material is widely used in LED lenses with low transmittance requirement.
Second, high-power LED lamp bead silicone lens:
Silicagel (Silicagel; Silica gel is a highly active adsorption material, is an amorphous substance, because of the high temperature resistance of silica gel (can also be reflow), so it is usually used to directly package on the LED chip, the general silica gel lens size is small, diameter 3-10mm. Because the larger the product size, the higher the production cost, in addition to being used in LED chip packaging, other applications are less.
Third, high-power LED lamp bead glass lens:
Optical glass material, the main advantages are light transmittance up to 97%, high temperature resistance characteristics; However, it is also faced with the factors of single product shape, fragile, difficult to achieve mass production, low production efficiency and high cost. Although very few manufacturers in China have begun to develop glass molding processes, the use of mold casting to produce glass lenses can produce lenses of various shapes and special surfaces. However, the current price of such production equipment is high, and it is difficult to popularize in the short term. In addition, the shortcomings of fragile glass materials need to be studied and solved. Due to the high transmittance and high cost of glass lens, it is generally used in optical precision instruments.
Four, high power LED lamp bead PMMA lens:
PMMA is derived from English acrylic (acrylic plastic), the chemical name is polymethyl methacrylate, commonly known as plexiglass, and Hong Kong and Taiwan are used to PMMA as acrylic. This material is an important plastic polymer material developed earlier, with good transparency and chemical stability. Plastic materials, which have the same characteristics as PC materials, easy to form, high production efficiency, light weight, anti-fall, and high light transmittance at 3mm thickness, the penetration rate is about 93%; The disadvantage is that the temperature can not exceed 85 degrees, and the thermal deformation temperature is 92 degrees. Because of its good transmittance, high efficiency of mass production and low cost, the material is widely used in various optical lenses.