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Area light source collimation device

A surface light source and collimation technology, which is applied in the field of optical collimation, can solve the problems of stray total reflection, low energy utilization rate, and poor collimation effect, and achieve good collimation effect and high energy utilization rate

Inactive Publication Date: 2012-10-03
GUANGDONG VTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for optical systems with relatively high collimation requirements, it is difficult to meet the requirements of such collimation.
[0004] There is also a method of using a point light source plus a lens to realize a collimated surface light source, but because the point light source is too large, the stray and total reflection phenomena are too serious, making the collimation effect poor
In order to solve this problem, there is a way to use a light absorbing cover to absorb the light at a large angle, and only let the light at a small angle enter the lens to improve the collimation effect of the outgoing light, but this method makes the final energy utilization rate too low. The light is absorbed by the absorber
[0005] In summary, the existing surface light source collimation technology has problems such as poor collimation effect or low energy utilization rate.

Method used

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  • Area light source collimation device
  • Area light source collimation device
  • Area light source collimation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, the surface light source collimating device of this embodiment includes: a reflective sheet 1 and a collimating layer 3 and a correction layer 4 arranged above the reflective sheet 1 in sequence. The material of the collimation layer 3 is PMMA, the refractive index is 1.49, and the critical angle of total reflection is 42.15°, and it is composed of a plurality of micro-collimation lenses 30 arranged closely and periodically. The correction layer 4 is placed on the alignment layer 3 and strictly aligned with the alignment layer 3 . The correction layer 4 is composed of a plurality of microprisms 40 arranged closely and periodically.

[0025] Such as figure 2 As shown, the micro-collimator lens 30 includes a beam converging portion 31 and a beam collimating portion 32; the bottom surface 311 of the beam converging portion 31 is provided with a small hole 312, and the bottom surface 311 is covered with a reflective film outside the small hole ...

Embodiment 2

[0033] The difference between this embodiment and Embodiment 1 is: (1) The material used for the collimation layer in this embodiment is F12 glass with a refractive index of 1.64; (2) as Figure 4 As shown, the beam collimating part of the micro-collimation lens has two layers of tilting and rotating lenses 322', 323', and the prism rotating part 42' of the microprism has corresponding and aligned Two-tier structure.

[0034] Such as Figure 4As shown, the working principle of this embodiment is as follows: the light-emitting surface is a Lambertian light source placed above the reflector, part of the light emitted by the light-emitting surface enters the collimation device through the small hole, and the other part of the light hits the reflective film layer around the small hole , is reflected back to the backlight, and re-enters the small hole after being reflected by the reflector. Repeating the above process, the light emitted by the backlight finally enters the beam co...

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PUM

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Abstract

The invention relates to the field of optical collimation, in particular to an area light source optical collimation device which comprises a reflection plate, a collimation layer and a calibration layer, wherein the collimation layer and the calibration layer are sequentially arranged above the reflection plate; the bottom of the collimation layer is coated with a reflection layer and a small hole; by virtue of the actions of the reflection layer and the reflection plate, an area light source between the reflection plate and the collimation layer is converged in the small hole, thus a spot light source is formed; the collimation layer divides the light rays entered into the small hole into a plurality of regions and converges the regions respectively, thereby avoiding the optical loss caused by the total reflection in the collimation layer; and the calibration layer is used for adjusting the light rays emitted from the collimation layer, so that the light rays can emit at the direction which is in parallel to the axis of the small hole. So the area light source collimation device provided by the invention has a higher collimation effect and a higher energy utilization ratio.

Description

technical field [0001] The invention relates to the field of optical collimation, in particular to a surface light source optical collimation device. Background technique [0002] Planar light sources are commonly used in lighting, LCD display backlights, light boxes, etc. In order to consider wide viewing angles, ordinary planar light sources have a large luminous angle. In recent years, with the development of energy-saving issues and 3D display, research on highly collimated planar light sources has become a hot spot. [0003] In addition to lasers, general light sources are usually diffuse light sources, that is, they have a large light emitting angle and do not have the characteristics of collimated light output. To achieve collimated light output characteristics, some optical elements must be added to control the light output direction to concentrate in a small angle. The commonly used collimation method of surface light source is 3M prism film, which can make the li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F21V5/04F21V7/00
Inventor 彭晓林黄永峰张洪哲
Owner GUANGDONG VTRON TECH CO LTD