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Method of maintaining working face illumination

A working surface and illuminance technology, applied in lighting devices, light sources, electrical components, etc., can solve the problems of affecting the size of the collected light, the uniformity of the illuminance of the working surface, and the inability to accurately adjust the change of the light power of the light source, so as to maintain the illuminance, Maintaining stable, precise lighting effects

Active Publication Date: 2019-01-11
ZHEJIANG JULION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when major changes occur on the working surface, such as the overall desktop color, relative position, etc., the light reflection ability of the working surface changes greatly, which affects the size of the collected light
The conventional photoelectric device detects the change of ambient light by collecting light. If the error of collecting light caused by the color of the working surface is not eliminated, it will not be able to accurately adjust the light power change of the light source, which will have a relatively large impact on the uniformity of the illumination of the working surface. big impact

Method used

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  • Method of maintaining working face illumination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 The method for maintaining the illuminance of the working surface according to the embodiment of the present invention is schematically given, such as figure 1 As shown, the method for maintaining the illuminance of the working surface comprises the following steps:

[0033] (A1) The light source emits illuminating light;

[0034] (A2) Collect ambient light and the reflected light of the illumination light on the working surface to obtain the total light intensity I and the red light intensity I R , green light intensity I G and blue light intensity I B ;

[0035] (A3) Change the light intensity I R , light intensity I G and light intensity I B Convert to RGB values, respectively R 0 , G 0 , B 0 (range 0-255);

[0036] (A4) get as well as;

[0037] in

[0038]

[0039]

[0040]

[0041] P 1 =96.422, Q 1 =100,H 1 =82.522;

[0042] (A5) Obtain the correction value ΔI of the total light intensity I according to the change value ΔD of ...

Embodiment 2

[0051] An application example of the method for maintaining illuminance on a working surface according to Embodiment 1 of the present invention.

[0052] In this application example, the total light intensity I and the light intensity I R , I G , I B The way to get it is:

[0053] (A1) LED emits illuminating light;

[0054] (A2) Collect ambient light and the reflected light of the illumination light on the working surface to obtain the total light intensity I and the red light intensity I R , green light intensity I G and blue light intensity I B , the specific way is:

[0055] When there is no filter device on the optical path before the photodetector, the light intensity received by the photodetector is the total light intensity I;

[0056]When there are filters of different colors on the optical path in front of the photodetector, the photodetector receives light intensity I that only includes red light, green light, and blue light. R , I G , I B ;

[0057] (A3) ...

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Abstract

The invention provides a method for maintaining the illumination of a working surface. The method comprises the following steps: (A) a light source emits illumination light; (A2) collecting ambient light and reflected light of the illumination light on the working surface to obtain a total light intensity I, a red light intensity IR, a green light intensity IG and a blue light intensity IB; (a) converting the light intensity IR, the light intensity IG and the light intensity IB into RGB values, which are R0, G0 and B0, respectively; (A4) obtaining a, b and D; (A5) obtaining a correction value.DELTA.I of the total light intensity I according to the variation value. DELTA.D of D; (A6) obtaining an illuminance E according to the correction value DELTA.I; (A7) adjusting the light emission ofthe light source according to the illuminance E and the illuminance preset value E0 so as to maintain the stability of the illuminance of the working surface when the color of the working surface changes. The invention has the advantages of good illuminance stability of the working surface and the like, and can be widely used in indoor lighting, such as a classroom.

Description

technical field [0001] The invention relates to the adjustment of the light source, in particular to the method and method for maintaining the illuminance of the working surface. Background technique [0002] Since relevant authorities have promulgated national standards and local standards to regulate classroom lighting, some schools have adopted new LED light sources to replace old ordinary fluorescent lamps or tricolor fluorescent lamps. These new LED lights can meet the color temperature and illuminance specified by classroom lights. Uniformity and the specified illuminance value above 300lx. With the continuous development and improvement of these new lights, and in response to the call for energy saving, the classroom intelligent lighting control system was proposed and realized. The classroom intelligent lighting control system can initially realize the opening and closing and adjustment of classroom lights. A small number of control systems use photosensitive device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/20H05B45/10
Inventor 佘检求罗飞何涛
Owner ZHEJIANG JULION TECH DEV CO LTD
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