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A Secondary Light Distribution Method Based on Brightness

A technology of secondary light distribution and brightness, applied in the direction of light source, components of lighting devices, semiconductor devices of light-emitting elements, etc., can solve the problem of neglecting brightness measurement, and achieve the effect of brightness uniformity and no glare

Active Publication Date: 2018-03-27
叶丹 +1
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Problems solved by technology

Because the light distribution based on illuminance is easy to design, convenient to measure, and not affected by the reflection characteristics of the road surface, the design and measurement are also convenient, so it is welcomed by designers and users and is widely used, thus almost completely ignoring the measurement of brightness

Method used

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  • A Secondary Light Distribution Method Based on Brightness
  • A Secondary Light Distribution Method Based on Brightness
  • A Secondary Light Distribution Method Based on Brightness

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Embodiment Construction

[0025] A secondary light distribution method based on brightness in the present invention comprises the following steps:

[0026] Step 1. Establish a mathematical model according to road lighting requirements (such as figure 2 ), to find the light intensity distribution in the image space:

[0027] CIE144-2001 proposes a reflection coefficient table Γ(β, Tanγ) for different road surfaces, which is used to represent the reflection performance of the road surface.

[0028] CIE144 defines luminance coefficient q(β, γ)=dL(β, γ) / dE(β, γ) ⑴ that is, the luminance coefficient is the ratio of the luminance of the measured point on the road surface to the illuminance of the point (see figure 2 );

[0029] The relationship between the brightness coefficient q(β, γ) and the reflection coefficient table Γ(β, Tanγ) is:

[0030] Γ(β,γ)=q(β,γ)*COS 3 gamma (2)

[0031] According to the national standard CJJ45-2006, the uniformity of illumination brightness of the corresponding road U ...

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Abstract

The invention relates to a secondary light distribution method based on brightness. According to the secondary light distribution method based on brightness, a mathematical model is established at first according to road surface lighting requirements, and light distribution in an image space is solved; next, another mathematical model is established, and a surface shape of a lens is solved; finally, a light distribution effect is verified through simulation. By the adoption of the secondary light distribution method based on brightness, all the road lighting indexes related to driving and road safety are taken into account, brightness, brightness uniformity index requirements and glare index requirements serve as design starting points, an illuminance index is considered at the same time, different light distribution space curves are set according to different road surface requirements and a simplified brightness coefficient table recommended by CIE144-2001, therefore, free light distribution is achieved, brightness uniformity in the driving direction on a road surface and glare avoidance in the visual field range of a driver are guaranteed, and the requirements of owners and uses are simultaneously met.

Description

technical field [0001] The invention relates to a secondary light distribution method based on brightness. Background technique [0002] At present, the road lighting index adopts a dual-track scheme in which the illuminance index and the brightness index are equal, and the lighting index based on the illuminance is still implemented in essence. Although national standards, CIE, and EN all formulate road lighting standards based on luminance, due to the difficulty in designing and measuring luminance and light distribution, additional illuminance indicators are recommended, and different corresponding values ​​of luminance indicators are given according to different pavement materials. For all kinds of lamps with the same glass bulb, because they cannot flexibly distribute light, the light intensity distribution of the lamps is roughly the same, which has certain convenience. Because the light distribution based on illuminance is easy to design, convenient to measure, and n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F21V5/04F21Y115/10F21W131/103
CPCF21V5/04F21W2131/103
Inventor 叶丹叶荣南
Owner 叶丹
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