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Light guide for area light source, its production method, and area light source

A manufacturing method and technology of surface light source, applied in the field of light guides, can solve the problems of easy discovery, uneven brightness, etc.

Inactive Publication Date: 2010-08-18
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon is not actually a problem especially when the frame width is large. However, in the case of the above-mentioned surface light source device with a narrow frame width, unevenness in luminance due to this effect is easy to see visually, so it is particularly problematic.

Method used

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  • Light guide for area light source, its production method, and area light source
  • Light guide for area light source, its production method, and area light source
  • Light guide for area light source, its production method, and area light source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] In this example, the light guide described in the embodiments of FIGS. 1 to 4 and a surface light source device using the light guide were produced.

[0103] In order to manufacture the first mold member 330, use glass beads with a particle diameter of 75 micrometers or less (manufactured by Potsutas Barodey-Ni Co., Ltd., trade name: "J-220") is subjected to sandblasting treatment, the treatment conditions are: the distance from the stainless steel plate to the nozzle is 320mm, the injection pressure is 0.1MPa, the sandblasting treatment is performed on almost the entire surface, and the first roughening treatment is performed. At this time, as shown in FIG. 5(b), by floating the shielding member M1 on the stainless steel plate, only the area near the edge (one long side) E is not roughened. On the other hand, the degree of sandblasting changes continuously on the boundary between the area near the edge E and other areas, and the change is quite drastic.

[0104] Next,...

Embodiment 2

[0117] In order to manufacture the first mold member 330, use glass beads with a particle diameter of 75 microns or less (manufactured by Potsutas Barody-Ni Co., Ltd., trade name " J-220") for sandblasting treatment, the treatment conditions are: the distance from the stainless steel plate to the nozzle is 320mm, the blowing pressure is 0.1MPa, sandblasting is performed on almost the entire surface, and the first rough surface treatment is implemented. At this time, as shown in FIG. 5( b ), by floating the shielding member M1 on the stainless steel plate, only the area near the edge (one long side) E is not roughened. The arrangement of the shielding member M1 with respect to the stainless steel plate, that is, the overlapping width of the shielding member M1 and the stainless steel plate in a plane parallel to the stainless steel plate is smaller than in Example 1. By doing so, it is possible to make the change in the degree of blasting treatment on the boundary between the a...

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Abstract

An area light source comprises a primary light source (1) and a plate-shaped light guide (3) having a light entrance end face (31) and a light exit face (33). The luminance variation in the region near the light entrance end face of the light guide caused by reduction in the size of the light guide is hardly perceived, and oblique singular light exit is little near the light entrance end face. The light exit face (33) is roughened. The average angle of inclination theta a of the surface of a specific region (A) near the light entrance end face (31) takes on a maximum value theta a1 larger than the average value theta a0 of the average angle of inclination of the general region (B) except for the specific region between the boundary with the general region (B) and the boundary with the light entrance end face (31) and takes on an angle theta a2 smaller than the average value theta a0 near the boundary with the light entrance end face (31). The maximum value theta a1 lies in the range from 2.2 degrees or more to 4.0 degrees or less. The average angle theta a0 lies in the range from 1.4 degrees or more to below 2.4 degrees.

Description

technical field [0001] The present invention relates to an edge-illuminated surface light source device, a light guide used in the device, and a manufacturing method thereof, and particularly relates to a surface light source device for reducing luminance unevenness from visual detection and a light guide used in the device. light guide. The surface light source device of the present invention is suitable, for example, as a backlight of a liquid crystal display device used as a monitor of a portable notebook computer or a display unit of a liquid crystal television or a video-integrated liquid crystal television, and as a display panel of a portable electronic device such as a mobile phone. Backlighting of relatively small liquid crystal display devices used for indicators of various equipment, backlighting of liquid crystal display devices used as guide panels and signboards of stations and public facilities, or traffic signs of expressways and general roads used in the back...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357F21V8/00F21Y103/00G02B6/00
CPCG02B6/0036G02B6/0053
Inventor 野崎义人
Owner MITSUBISHI RAYON CO LTD