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Light source device

A light source device and light source technology, applied in optics, nonlinear optics, prisms, etc., can solve the problems of narrow field of view of the light guide, large light distribution range, and inability to endow the light emitting mechanism with high directionality, etc.

Inactive Publication Date: 2008-07-23
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the convex curved prism surfaces described in these publications all have large or small radii of curvature, so that the distribution of light emitted from the light guide either cannot achieve a sufficiently narrow field of view, or make the field of view very narrow, or sometimes expand the field of view instead.
Moreover, the light guides described in these publications cannot provide high directivity to the light emitting mechanism, and the emitted light distribution range is relatively large. Even if the light is collected on a prism plate, the brightness cannot be sufficiently improved.

Method used

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Examples

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Embodiment 1

[0088] A light guide plate having one rough surface (average inclination angle of 3.0 degrees) was produced by injection molding with acrylic resin (ACRYPET VH5#000 manufactured by Mitsubishi Reyon Corporation). The light guide plate is formed into a wedge shape of 195mm×253mm and a thickness of 3mm to 1mm. On the mirror surface side of the light guide, a prism layer of prism strips with an apex angle of 140 degrees and an interval of 50 μm is formed in parallel with the side (short side) of the light guide with a length of 195 mm. . Configure a cold cathode tube, cover it with a light source reflector (silver reflective film manufactured by Liguang Co., Ltd.) along its long side, and make the cold cathode tube correspond to a side end surface with a length of 53 mm in the light guide body (long side) (The end surface on the side with a thickness of 3 mm) faces each other. Further, a light-diffusing reflective film (E60 manufactured by TORAY Corporation) was attached to the ...

Embodiment 2

[0096] Injection molding was performed using an acrylic resin (ACRYPET VH5#000 manufactured by Mitsubishi Reyon Co., Ltd.), and a light guide plate having a rough surface (average inclination angle of 8.0 degrees) was produced on one surface. The light guide plate is formed into a wedge shape of 195mm×253mm and a thickness of 3mm to 1mm. On the mirror side of the light guide, a prism layer of prism strips with an apex angle of 140 degrees and a pitch of 50 μm was formed with acrylic ultraviolet curable resin so as to be parallel to the side (short side) of the light guide with a length of 195 mm. Configure a cold cathode tube, cover it with a light source reflector (silver reflective film manufactured by Liguang Co., Ltd.) along its long side, and make the cold cathode tube correspond to a side end surface with a length of 53 mm in the light guide body (long side) (The end surface on the side with a thickness of 3 mm) faces each other. Further, a light-diffusing reflective fi...

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Abstract

The present invention provides a light source device having a light guide (3) for guiding light emitted from a primary light source and emitting light obliquely from a light emission face (33) thereof, and a light deflecting device (4) disposed so as to be adjacent to the light emission face. Plural elongated prisms are arranged in parallel to one another at a light incident surface (41) of the light deflecting device. Virtual elongated prisms (I) each having a vertical angle of 50 to 70 DEG arranged in the same arrangement pitch as the elongated prisms are assumed so that the peak emission light in the light emission distribution of light emitted from the light emission face is incident on one virtual prism face of the virtual elongated prism, internally totally reflected by another virtual prism face and then emitted in a desired direction from a light emission surface (42) of the light deflecting device. A prism face of each elongated prism at the far side from the primary light source is designed to have a convex surface shape with respect to the shape of the virtual elongated prism. The value (r / P) of the radius of curvature r normalized by the arrangement pitch P is equal to 7 to 30, and the ratio (d / P) of the maximum distance between the convex-surface-shaped prism face of the elongated prism and the virtual prism face to the arrangement pitch P is equal to 0.05 to 5%.

Description

[0001] This application is a divisional application of the following application: [0002] Filing date of the original application (international filing date): December 11, 2001 [0003] National application number of the original application: 01820374.4 (International application number: PCT / JP01 / 10842) [0004] Invention title of the original application: light source device technical field [0005] The present invention relates to an edge-illuminated light source device constituting a liquid crystal display device used as a display portion of a notebook personal computer and a liquid crystal television, and particularly relates to an improvement of a light deflection element disposed on the light exit surface side of a light guide. technical background [0006] In recent years, color liquid crystal display devices have been widely used in various fields as monitors of portable notebook personal computers and personal computers, and as display units of liquid crystal tele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335G02B5/04
Inventor 山下友義千葉一清
Owner MITSUBISHI RAYON CO LTD
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