Design method of free-form surface reflector for LED automobile rear fog lamp

Abstract

The invention provides a design method of a free-form surface reflector for an LED automobile rear fog lamp. The design method comprises the following steps: initial conditions are set, and a target lighting region is uniformly divided; a light source solid angle is divided, and a mapping relation is established according to the energy conservation law; discrete point coordinates of the free-form surface reflector are calculated; and discrete ordinate points are fitted into a curved surface by utilizing mechanical modeling software. According to the design method provided by the invention, the size of the free-form surface reflector is small, the glare effect is low as a light emitting surface of a light source is vertically installed upwards, and meanwhile, the light distribution requirements of national standard GB 11554-2008 for the LED automobile rear fog lamp can be met. According to the technical scheme provided by the invention, the light emitting surface of the light source emits lights upwards perpendicular to the optical axis direction and the light is reflected by the free-form surface reflector, and finally, the light emerges onto a lighting surface; and the free-form surface reflector has the advantages of symmetry, simple design and high efficiency.

Description

technical field [0001] The invention relates to the field of LED lighting optical system design, in particular to a design method for a free-form reflector of an LED automobile rear fog light optical system. Background technique [0002] Compared with traditional light sources, LED light sources have the advantages of small size, low heat consumption, energy saving and environmental protection, and good uniformity. Using cold light-emitting technology, they have good color rendering and no flicker. In recent years, with the reduction of LED manufacturing costs and the continuous improvement of application technology, LEDs have become more and more widely used in vehicle lighting. LED car lights will be the development trend of vehicle lighting applications in the future. [0003] According to the national standard GB11554-2008 on the light distribution requirements of automotive LED rear fog lamps, a specific illuminance requirement must be met within a diamond-shaped range ...

AI Technical Summary

Problems solved by technology

The direct light energy utilization rate is high, the structure is simple, and it is easy to design, but the light source can be seen directly, so the lighting effect is not good, and the direct light source is easy to affect the people behind the car

The transmission type is also called the refraction type. The light energy utilization rate of the transmission type is low, and the control accuracy is required to be high. It is relatively complex and it is still a big challenge to realize the light distribution of LED rear fog lights.

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