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Design method for high-diffuse-reflection-rate free-form surface for achieving even-illumination

A technology with high diffuse reflection and uniform lighting, applied in lighting and heating equipment, parts of lighting devices, reflectors, etc., can solve the problems of detection target contrast, uneven light mixing, and glare discomfort that affect the resolution of the collected image.

Inactive Publication Date: 2013-08-07
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

However, when multiple bands of LEDs are used as the light source of the color image vision system for illumination, the above method often produces the problem of uneven light mixing, which will affect the resolution of the collected image and the contrast of the detection target, which is not conducive to simplifying the image algorithm
In addition, after a large amount of light is reflected or refracted by the mirror, it may cause glare and discomfort, which is one of the important reasons for visual fatigue

Method used

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  • Design method for high-diffuse-reflection-rate free-form surface for achieving even-illumination
  • Design method for high-diffuse-reflection-rate free-form surface for achieving even-illumination
  • Design method for high-diffuse-reflection-rate free-form surface for achieving even-illumination

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Embodiment Construction

[0050] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0051] Such as figure 1 As shown, the LED optical system based on diffuse reflection indirect illumination consists of four parts: CCD camera 1 for image capture in color vision measurement, three-ring array LED light source 2, high diffuse reflectance with symmetrical shape features along the central axis of rotation The inner surface 3 of the free-form surface has a diameter of 33mm The light-through circular hole is convenient for the CCD camera 1 to collect images and the target detection plane 4 . In the present invention, the light emitted by the three-ring array LED light source can realize reasonable control and distribution of light intensity after being diffusely reflected by the inner surface of the free-form surface with high diffuse reflectance, and form a uniform illumination area on the target detection plane.

[0052]...

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Abstract

The invention provides a design method of a light-emitting diode (LED) even-illumination light source based on a high-diffuse-reflection-rate free-form surface. A general mathematical model of a free-form surface diffuse reflection surface for secondary light distribution is built by utilizing a bidirectional reflection distribution function (BRDF) of a high-diffuse-reflection-rate surface according to light-emitting characteristics of the LED light source. The mathematical model is utilized to write a nonlinear algebraic equation set by combining specific requirements for target illumination areas and the irradiance distribution in an actual application occasion, and a numerical method is utilized to conduct calculation to obtain a surface type outline of the diffuse free-form surface. The LED indirect light source based on the high-diffuse-reflection-rate free-form surface is compact in system structure, high in illumination evenness and capable of being used in the fields of color vision measurement, indoor illumination, projector devices and the like requiring high-evenness illumination conditions and has good application prospects.

Description

technical field [0001] The invention belongs to the field of optical technology and lighting technology, and in particular relates to a free-form surface with high diffuse reflectance for redistributing LED light source energy to realize uniform lighting. Background technique [0002] As a new generation of green light source, light-emitting diode (LED) has many advantages such as high luminous efficiency, low energy consumption, long life, compact structure, good safety and stability, and is widely used in fields that require uniform lighting conditions such as color image vision It has shown a very broad application prospect. However, the light energy provided by a single LED is limited, and it is difficult to meet the large-area and high-brightness lighting requirements in practical lighting systems. Moreover, the light output of most LED products presents a Lambertian distribution, which is not suitable as a system light source alone. In most applications, it is necess...

Claims

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Application Information

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IPC IPC(8): F21V7/04F21S2/00F21Y101/02F21K9/90
Inventor 祝振敏金小龙衷路生
Owner EAST CHINA JIAOTONG UNIVERSITY
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