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Views: Date£º2009/6/8
1, LED lens types of materials:
1.1 Silicone lens;
a. because of the high temperature silicone (also can lead reflow), so commonly used in the LED chip package directly;
b. General silicone lens smaller in diameter 3 ~ 10mm;
1.2, PMMA lens
a. optical grade PMMA (polymethyl methacrylate, commonly known as: Acrylic)
b. Plastic materials
Advantages: high efficiency (can be done by injection); transmission rate (3mm thickness, transmittance of 93%)
Disadvantages: temperature, 70% (heat distortion temperature of 90 degrees, in line with PMMA can withstand temperature range, the use of PMMA lens often have to consider increasing the distance between light and shade, or reduce the light output power);
1.3, PC lens
a. optical grade nylon Polycarbonate (referred to as PC) Polycarbonate
b. Plastic materials
Advantages: high efficiency (can be done by injection); high temperature (130 degrees)
Disadvantages: slightly lower transmittance (87%);
1.4, glass lens
Optical glass materials,
Advantages: high transmittance (97%), high temperature characteristics,
Disadvantages: fragile, difficult to achieve accuracy of non-spherical, low productivity and high cost
2, LED lens, the application of classification
2.1, a Lens
a, a lens is a direct package (or bonding) in the LED chip stand, with the LED as a whole;
b, LED chip (chip) according to the theoretical light is 360 degrees, but in fact placed on the LED chip to be fixed and the packaged bracket, so the chip is 180 degrees maximum angle of light, while the chip will be some stray light, so by a lens chip can effectively collect all the light can be like 160 degrees, 140 degrees, 120 degrees, 90 degrees and 60 degrees (different needs) of the light angle;
c, a multi-purpose lens, PMMA, or silicone materials.
2.2, the second lens
a, the second lens and LED are two separate objects, but they are inextricably linked in the application of Shique;
b, the function of the second lens is a wide-angle LED light (generally 90 to 120 degrees) into a re-condenser 5 degrees to 80 degrees any angle you want to be;
c, most of the second lens with PMMA or glass material
3, LED Lens Size Category
3.1, transmission (convex lens, a single convex lens convex radius of curvature calculated by the following companies:
1/R1-1/R2 = 1 / F (N1-1)
Where F - focal length
R1, R2 - respectively, the surface of the lens radius of curvature of the two
N1 - the refractive index of lens material. When the surface is flat, the curvature radius of infinity)
a, when the LED light through the lens of a surface (there are two double convex surfaces) occurs when the refracted light condenser, and when to adjust the distance between the lens and the LED will change when the angle (inversely), through non-spherical Technology designed to spot will be very uniform surface, but because the limitations of the lens diameter, lens not use the light side (leaked);
b, general application in the wide-angle (40 ~ 80 degrees) condenser, such as lamps, streetlights,
3.2, the total reflection type (called the cup or cone)
a, lens design with Chuantou Shi in front of the condenser, while the tapered noodles proved Quanbu can be collected and reflected off the side light, which is the superposition of two light (angle the same) can be the most perfect light Li Yong and beautiful spot effect;
b, can also make some changes in the conical surface of the lens can be designed to mirror, matte surface, bead face, striped face, screw face, convex or concave, etc., get a different spot effects.
3.3, LED Lens Module
a, is the number of single lens by injection to complete a whole long lens can be designed according to different needs of 3 in 1,5 in 1, or even dozens of one of the lens module;
b, this design effectively saving production costs, product quality and consistency, saving lamps institutional space, easier to achieve "power" and so on
4, optical loss
4.1, there are lamp shell, the actual lens of the lamp the luminous flux of light to meet the requirements of the standard distribution, but also need to consider the case, lens transmittance, spill light loss and other factors. In order to better optics and reasonable design of lighting should be divided into rectangular small housing units, the purpose of doing so is to break the light of the wave surface, so that the products have a uniform appearance
4.2, using two-way form the lens surface curvature, according to design requirements to allocate more free light output, more efficient use of flux, to reduce unnecessary waste and glare
4.3, we choose to put in the lens focus light inside, the light source farther away from the lens, lens collected light flux less, and thus lower the efficiency of the lens system, a single convex lens according to the formula
R = (NL-1) F
Where R - radius of convex curvature
NL - refractive index of lens material
F - focal length
Lens materials in selected cases, the focal length the greater the larger the radius of curvature. ¡é in the same condition lens aperture, the larger radius of curvature, the thinner the lens. The thicker the lens, aberrations will be more obvious, and thus affect the results. Therefore, as a large focal length lens choice, while the focal length increases, the optical system size will increase, therefore, the lens focal length is also not blindly pursue the most. As the thickness of the lens is not great, so there is no use of Fresnel lens, to avoid the cumbersome process and increase costs.
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R = (NL-1) F
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F - §æ§à§Ü§å§ã§ß§à§Ö §â§Ñ§ã§ã§ä§à§ñ§ß§Ú§Ö §à§Ò§ì§Ö§Ü§ä§Ú§Ó§Ñ
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