Optical lens

Abstract

The invention discloses an optical lens. The optical lens comprises a lens body. A light-incidence curved surface with the center sunk upwards for incidence of light is formed on the bottom of the lens body. A first light-exit curved surface with the center sunk downwards is formed on the top of the lens body. A second light-exit curved surface is formed on the side portion of the lens body. After incidence of the light through the lens body is finished, an included angle between the first light-exit curved surface and the axis of the lens body is 42 degrees as a critical angle, light beams between a central light beam and 42 degrees are refracted through the first light-exit curved surface, and light beams between 42 degrees and 85 degrees are refracted through the second light-exit curved surface after being totally refracted through the first light-exit curved surface. According to the optical lens, a catadioptric way is adopted for beam angle diffusion, and brightness uniformity on a receiving surface is improved.

Description

Technical field [0001] The invention relates to an optical lens, in particular to an optical lens applied to a direct type backlight system, belonging to the field of semiconductor lighting. Background technique [0002] As the secondary light distribution product of LED, optical lens is widely used in lighting field. Since this kind of optical lens is mostly composed of optical grade pmma (polymethyl methacrylate) or pc (polycarbonate) materials, it has the advantages of low cost, easy injection molding, high light transmittance, and small size, and is gradually being used To the field of LED backlight. [0003] Such as figure 1 As shown, the optical lens used in the LED backlight requires a large beam angle, generally between 155° and 160°. The light-emitting surface of the upper surface is a free-form surface; the lower surface is a flat surface, usually with prisms and cones. The light-incident surface facing the light source is composed of a non-conical surface. [0004] The ...

AI Technical Summary

Problems solved by technology

[0006] 2) Due to the influence of the production and processing process, the free-form surface of the large-angle lens design may easily cause excessive deviation from the original design surface, which will affect the uniformity of the product

[0008] 4) The current large-angle diffusion lens design uses the refraction effect of the optical surface on the light to design the diffusion angle, which increases the design difficulty

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