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Design method of Fresnel lens for sub-area uniform illumination based on Lambertian led light source

A Fresnel lens and LED light source technology, applied in the non-imaging field, can solve the problems of single focusing and insufficient uniformity of illumination, and achieve the effects of enhanced uniformity, compact and simplified structure, and easy preparation, production and processing.

Inactive Publication Date: 2021-11-19
DALIAN POLYTECHNIC UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a Fresnel lens design method for sub-area uniform lighting in order to solve the problems of single focusing and insufficient illumination of traditional Fresnel lenses on the market; Parts of the Fresnel lens are combined together to finally form a sub-area homogeneous Fresnel lens composed of multiple concentric arcs, which can homogenize the outgoing light

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  • Design method of Fresnel lens for sub-area uniform illumination based on Lambertian led light source
  • Design method of Fresnel lens for sub-area uniform illumination based on Lambertian led light source
  • Design method of Fresnel lens for sub-area uniform illumination based on Lambertian led light source

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Embodiment Construction

[0029] Such as figure 1 As shown, the present invention provides a Fresnel lens design method that realizes uniform lighting of LEDs, 1 is an LED light source, and 2 is a lens; figure 1 Indicates the relationship between the Fresnel lens output angle and the divergence angle, that is, the relationship between the output half-angle and the divergence half-angle θ-θ′, according to the optical relationship:

[0030] I·Ω=φ (1)

[0031] I=I 0 · cos θ (2)

[0032] Wherein, I is the light intensity of the point light source S reaching the exit surface in a given direction solid angle, and the unit is cd; E is the illuminance of the light reaching the exit surface, and the unit is lx; A is the area of ​​the exit surface, and the unit is square meters; Ω is the solid angle in a given direction, θ is the half-angle of light emission, θ' is the half-angle of light divergence, φ is the luminous flux of the light source reaching the exit surface in the solid angle of a given direction, ...

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Abstract

The invention discloses a Fresnel lens design method based on a Lambertian LED light source for sub-area uniform lighting. According to the law of the etendue conservation, the edge light deflection angles of different areas are calculated, the focal lengths of different areas are determined, and then the focal lengths of different areas are determined. Fresnel lens surface for uniform lighting in different areas. The present invention is applicable to spot lighting occasions where LED Lambertian light emission or Lambertian-like light emission occurs; by converging LEDs with Lambertian light emission in sub-regions, the received light is more uniform, and various problems caused by uneven light distribution of LED light sources can be solved. The problem of uneven distribution of light spot energy after the Fresnel lens is converged can improve the uniformity of the LED lighting system that uses the lens to condense light; at the same time, the present invention is designed by changing the focal length of the Fresnel lens in each area, greatly Improve design efficiency.

Description

technical field [0001] The invention relates to the non-imaging technology of optical design, in particular to a Fresnel lens design method based on Lambertian LED light source for sub-area uniform illumination. Background technique [0002] LED is a near-light-emitting device that converts electrical energy into light energy. It has a series of advantages such as small size, low power consumption, high luminous efficiency, and environmental protection. It is widely used in lamp lighting, liquid crystal backlighting, etc. However, with the improvement of lighting requirements in places where lighting and backlights are used, the requirements for uniformity are also getting higher and higher. Compared with traditional lenses, Fresnel lens has the advantages of large area, light weight, low price, light and easy to carry, etc. It is a widely used optical device. For example, marine lighting, lighting optics, etc., Fresnel lenses can better calibrate the output of light, reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/08G02B27/00
CPCG02B3/08G02B27/0012
Inventor 张云翠魏以婧谢蓄芬潘妲
Owner DALIAN POLYTECHNIC UNIVERSITY