Total internal reflection lens design method for custom lighting

A total internal reflection lens and total internal reflection technology, applied in the field of total internal reflection lens design, can solve the problems of not being able to generate uniform light spots, generating irradiance, and being unable to meet the complex needs of custom lighting

Inactive Publication Date: 2020-08-04
FUDAN UNIV
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  • Abstract
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Problems solved by technology

However, the lens cannot generate a uniform spot of arbitrary shape, and it is difficult to generate different levels of irradiance on the target surface
The total internal reflection lens has a higher light energy utilization rate and excellent light distribution characteristics, but most of the existing total internal reflection lenses are rotationally symmetrical, and are mostly used for simple collimation or to generate a uniform circular spot. Meeting the Complex Needs of Custom Lighting

Method used

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  • Total internal reflection lens design method for custom lighting
  • Total internal reflection lens design method for custom lighting
  • Total internal reflection lens design method for custom lighting

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Embodiment Construction

[0061] The present invention is further described below through specific examples.

[0062] (1) Schematic diagram of the structure of the refractive aspheric surface as shown in figure 2 As shown, first determine the uniform spot radius R generated by the LED light on the target surface after being adjusted by the refraction aspheric surface according to the design requirements max =1000mm, irradiation distance l=1000mm, lens refractive index n=1.643, lens center thickness d=10mm, LED maximum emission half angle θ max =π / 2rad and the distance between the LED and the lens center h=5mm and other conditions, assuming that the abscissa of any point on the refraction aspheric surface to be solved is x, and the ordinate is y surface , based on the geometric relationship between the LED and the refracting aspheric surface, the luminous flux conservation formula and Snell's law, a set of DAEs is derived. The specific process is:

[0063] According to the conservation of luminous fl...

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Abstract

The invention belongs to the technical field of non-imaging optical lenses, and particularly relates to a total internal reflection lens design method for custom lighting. According to the method, based on a Snell law and an edge light theory, in combination with the law of conservation of energy, a total internal reflection aspheric mathematical model and a transmission aspheric mathematical model are established, two sets of differential algebraic equations are obtained to represent contour curves of two aspheric surfaces, and aspheric surface type data are obtained through solving; an irradiance distribution problem of customized light spots is converted into a free-form surface solving problem, a group of nonlinear equations is established, and a lens boundary free-form surface contouris obtained by solving the equations; and the aspheric surface and the free-form surface are combined into a lens by using a software tool. The optical device designed by the invention has good lightdistribution performance, can customize the shape of the illumination light spots, is good in irradiation uniformity, has a relatively high energy utilization rate, and overcomes a problem that a traditional total internal reflection lens cannot generate a customized shape and high-efficiency uniform illumination light spots on a target surface.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and in particular relates to a design method of a total internal reflection lens for customized lighting. Background technique [0002] In recent years, various fields have put forward higher requirements for lighting, such as requiring LEDs to produce uniform and efficient radiation distribution on complex-shaped target surfaces, so that it can meet the lighting requirements of curved roads, while taking into account the surrounding environment of the road. Lower-level illumination; for example, in machine vision, the light source is required to generate different levels of irradiance on different areas of the target surface, thereby suppressing the phenomenon of highlights and shadows caused by the optical characteristics and special structure of the target surface. The above requirements are challenging for LED light distribution technology; currently commonly used LED light distributio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00F21V5/04F21Y115/10
CPCF21V5/04F21Y2115/10G02B27/0012
Inventor 孔令豹孙翔徐敏
Owner FUDAN UNIV
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