Uniform light focusing LED light source module design method based on free-form surface Fresnel lens

Abstract

The invention discloses a uniform light focusing LED light source module design method based on a free-form surface Fresnel lens. The method comprises the specific steps that a free-form surface partition area of the Fresnel lens is divided according to the number of LED light sources and the light emitting characteristic; then, the number of annular belts, a free-form surface, the height of the annular belts and a working side angle of the Fresnel lens are set according to light distribution requirements, so that the focal length, the numerical aperture and the light focusing angle of the Fresnel lens are obtained, and a Fresnel lens model and an LED light source module structure are acquired; and an illuminance distribution verification design effect is obtained by simulating the path of light rays refracted through the Fresnel lens. According to the uniform light focusing LED light source module design method based on the free-form surface Fresnel lens, the problems that traditional LED light source lenses are generally poor in light distribution effect, low in light focusing multiplying power, large in thickness, only capable of being matched with a single LED light source and the like are solved; the method can adapt to light source module designs of different light source numbers and different sizes; and an integrated uniform light focusing LED light source module large in area can be obtained through the characteristics of the free-form surface Fresnel lens.

Description

technical field [0001] The invention relates to a design method of an LED light source module, in particular to a design method of a uniformly concentrating LED light source module based on a free-form surface Fresnel lens. Background technique [0002] LED (Light Emitting Diode), that is, light-emitting diode, is a solid-state semiconductor light-emitting device with low power consumption, long service life, high efficiency and environmental protection, and is a new generation of energy-saving and environmentally friendly lighting products. Generally, non-integrated LED light sources can be used as ideal point light sources, and are widely used in indoor and outdoor lighting fixtures. Due to extremely low power consumption, high luminous efficiency and excellent color rendering index, it is widely used in urban lighting, commercial lighting and home lighting and other fields. However, due to the small size of the LED light source, its primary light distribution can only me...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a design method of a uniform concentrating LED light source module based on a free-form surface Fresnel lens, which solves the problem of poor secondary light distribution effect and light efficiency utilization of LED light sources. It can also integrate the Fresnel lens and the lamp housing kit, which is a new type of LED light source module component.

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