Title:
PLANAR LIGHT SOURCE DEVICE
Document Type and Number:
WIPO Patent Application WO/2010/021083
Kind Code:
A1
Abstract:
A light guide plate (63) is provided with a light introducing section (65) having a thickness larger than that of a light guide plate main body (64) at an end of the light guide main body (64). A spot light source (62) is permitted to face an end surface (light incoming end surface (66)) of the light introducing section (65). The light introducing section (65) has a large thickness with a protruding section which has a shape of a half circular truncated cone and protrudes from a surface of the light guide plate (63), and the outer circumferential surface of the protruding section is an inclined surface (67). On the inclined surface (67), a directivity conversion pattern (68) is configured by arranging V-groove structures (68a) along the outer circumferential surface of the protruding section. Furthermore, on an inner circumferential section of the directivity conversion pattern (68), an auxiliary inclined surface (71) having an inclination angle smaller than that of the inclined surface (67) is formed along the inner circumferential edge of the directivity conversion pattern (68).
Inventors:
KURATA GOUO (JP)
HIROTA KAZUHIDE (JP)
ARAI TSUYOSHI (JP)
HIROTA KAZUHIDE (JP)
ARAI TSUYOSHI (JP)
Application Number:
PCT/JP2009/003435
Publication Date:
February 25, 2010
Filing Date:
July 22, 2009
Export Citation:
Assignee:
OMRON TATEISI ELECTRONICS CO (JP)
KURATA GOUO (JP)
HIROTA KAZUHIDE (JP)
ARAI TSUYOSHI (JP)
KURATA GOUO (JP)
HIROTA KAZUHIDE (JP)
ARAI TSUYOSHI (JP)
International Classes:
F21S2/00; F21Y101/02
Foreign References:
| JP2004241369A | 2004-08-26 | |||
| JPH10247413A | 1998-09-14 | |||
| JPH11237633A | 1999-08-31 |
Attorney, Agent or Firm:
NAKANO, MASAYOSHI (JP)
Masafusa Nakano (JP)
Masafusa Nakano (JP)
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