Design method and structure of condenser for car lights

Abstract

The invention relates to a design method and a structure of a condenser for car lights. The core of the method is that the incident end of the condenser is circumferentially divided into different areas for regional separated design. The incident end of the structure is provided with a fully-reflecting surface, a large-angle incident light receiving surface and a small-angle incident light receiving surface, which are successively connected from the periphery to the center to form a convex structure with the concave core. The small-angle incident light receiving surface comprises multiple Fresnel collimation planes, which at least have two focal distance specifications. The orthographic projections of these Fresnel collimation planes along the direction of the design optical axis are concentric sectors, and the sum of central angles of all the sectors is 360 degrees. A step structure is formed at the junction of adjacent two Fresnel collimation planes, and the interface is a plane which passes through the design optical axis. The light leakage problem of large-angle incident light of a traditional condenser structure for car lights is solved in the invention. Thereby, light receiving efficiency is enhanced, and large-angle bright specks are eliminated.

Description

technical field [0001] The invention relates to a design method and a corresponding structure of a concentrator for a vehicle lamp, which is mainly used for collecting light emitted by a light source in an optical system of a thick-walled part, and is especially suitable for the optical system of a headlamp or a tail lamp of a motor vehicle. The field of lamp technology. Background technique [0002] figure 1 It is the design structure of the traditional direct-type concentrator. In the light emitted by the LED light source 1, the small-angle incident light is refracted by the small-angle incident light receiving surface A and enters the concentrator and then exits through the light-emitting surface 6. The angle incident light receiving surface C is refracted into the concentrator and then is totally reflected by the total reflection surface B and then exits through the light exit surface 6. The outgoing light corresponding to the large angle light is as follows: figure 1 ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a design method and structure of a concentrator for car lights, which can solve the problem of light leakage of large-angle incident light in the traditional concentrator structure for car lights, thereby improving light collection efficiency and eliminating large-angle bright spots

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