Light guide plate and method for producing same

A light guide plate and substrate technology, applied in optics, light guides, light sources, etc., can solve problems such as cumbersome procedures and achieve good brightness

Inactive Publication Date: 2007-10-03
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Light guide plate and method for producing same
  • Light guide plate and method for producing same

Examples

Experimental program
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Embodiment 1

[0060] The methacrylic resin polymer-A is adjusted to 5% of the extruded raw material through the content of the sieve nominal size being less than 150, using a 150mmφ single-screw extruder (machine Cylinder temperature: 200°C-210°C-210°C-260°C-260°C-240°C from the feed side) and three polished rollers after temperature adjustment (roller temperature: 80°C) and traction device A plate forming machine uses a 200-mesh screen made of SUS304 between the barrel and the die to obtain a methacrylic resin extruded plate (extruded plate-A1) with an extrusion rate of 600Kg / hr, a width of 1000mm, and a thickness of 6mm. Table 1 shows the results of measuring bright spots using the bright spot measuring device shown in FIG. 1 . Next, cut out a size of 241 mm in width and 319 mm in length from the obtained extruded board with a circular saw, and polish the cut surface of the cut board with a precision grinder (PLA-BEAUTY: manufactured by Megalo Technica Co., Ltd.), and further perform surf...

Embodiment 2

[0064] Except that the amount of methacrylic resin polymer-B passed through the wire mesh with a nominal size of 14 mesh is adjusted to 0.1% as the extruded raw material, the extruded sheet is formed in the same manner as in Example 1 to obtain the extruded sheet- C1. The same measurement as in Example 1 was performed, and the results obtained are shown in Table 1.

Embodiment 3 and 4

[0068] Using the extrusion raw materials of Comparative Examples 1 and 2, except that the 400-mesh screen made of SUS304 was used to replace the 200-mesh screen between the barrel and the die, the extruded sheet was formed in the same way as in Example 1 to obtain the extruded sheet- E1, F1. The same measurement as in Example 1 was performed, and the results obtained are shown in Table 1.

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Abstract

Disclosed is a light guide plate for backlights which comprises a transparent thermoplastic resin substrate whose one side serves as the light-emitting surface. The transparent thermoplastic resin substrate has less than 20 bright dots having a size of not less than 0.1 mm<2> in an area of 319*150 mm.

Description

technical field [0001] The invention relates to a light guide plate and a manufacturing method thereof. The light guide plate is suitable for use in office automation equipment such as personal computers and word processors, and various monitors for displaying image signals, such as display screen monitors and television monitors. Used in display devices and surface light source devices in indoor and outdoor spaces, display devices, billboards, etc. Background technique [0002] Transparent thermoplastic resins, especially methacrylic resins, have been widely used in lighting applications due to their excellent light transmission and mechanical properties. In recent years, they have begun to be used as light guide plates for backlights such as display devices equipped with lighting lamps. . As the backlight method, the so-called direct type and the so-called edge lighting method where the light source is placed on the edge of the light guide plate are commonly used to sandw...

Claims

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Application Information

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IPC IPC(8): F21V8/00B29B11/10B29C47/68G02B6/00G02F1/13357F21Y103/00B29L11/00G02F1/1335
Inventor 神谷俊儿鹤田严一
Owner ASAHI KASEI CHEM CORP
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