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Fresnel lens design method based on Lambert-type LED light source regional dodging illumination

A Fresnel lens and LED light source technology, applied in the non-imaging field, can solve the problems of insufficient uniform illumination and single focusing, and achieve the effects of compact structure, enhanced uniformity and cost saving.

Active Publication Date: 2020-08-21
DALIAN POLYTECHNIC UNIVERSITY
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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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  • Fresnel lens design method based on Lambert-type LED light source regional dodging illumination
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  • Fresnel lens design method based on Lambert-type LED light source regional dodging illumination

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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 exit angle and the divergence angle, that is, the relationship diagram between the exit angle and the divergence angle θ-θ′, according to the optical relationship:

[0030] I·Ω=φ (1)

[0031] I=I 0 · cosθ (2)

[0032] Among them, I is the light intensity of the point light source S reaching the exit surface in a given direction solid angle, the unit is cd; E is the illuminance of the light reaching the exit surface, the unit is 1x; A is the area of ​​the exit surface, 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, l is the object ...

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Abstract

The invention discloses a Fresnel lens design method for regional dodging illumination based on a Lambert-type LED light source, and the method comprises the steps: calculating the edge light deflection angles of different regions according to the law of conservation of optical expansion, determining the focal lengths of different regions, and determining the surface type of a Fresnel lens for regional dodging illumination. The Fresnel lens design method is suitable for LED Lambert light emitting or similar Lambert light emitting spotlighting occasions; LEDs with Lambert emergent light are subjected to regional convergence, so that received light rays are more uniform, the problem of non-uniform light spot energy distribution after convergence of the Fresnel lens due to non-uniform light distribution of an LED light source is solved, and the uniformity of an LED lighting system using the lens to condense light can be improved; meanwhile, the design is performed by changing the focal length of the Fresnel lens in each region, so that the design efficiency is greatly improved.

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...

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Application Information

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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
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