Title:
照明装置及び液晶表示装置
Document Type and Number:
Japanese Patent JP4162900
Kind Code:
B2
Abstract:
One major surface of a light guide plate (12) is formed, in stripe form in a plan view, with a plurality of prism grooves (14) each consisting of a slight slope and a steep slope. The inclination angles of the slight slope and the steep slope are in ranges of 1 DEG to 10 DEG and 41 DEG to 45 DEG , respectively. The width of the steep slope in the one major surface of the light guide plate increases as the position goes away from a light incident surface of the light guide plate in such a manner that the width of the steep slope amounts to 1.1 to 1.5 at a position farthest from the light incident surface if it is assumed that the width of the steep slope is equal to 1.0 at a position closest to the light incident surface.
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Inventors:
Takuro Sugiura
Mitsuo Oizumi
Ryoma Yamashita
Mitsuo Oizumi
Ryoma Yamashita
Application Number:
JP2002028230A
Publication Date:
October 08, 2008
Filing Date:
February 05, 2002
Export Citation:
Assignee:
ALPS ELECTRIC CO.,LTD.
International Classes:
F21V8/00; G02B6/00; G02F1/13357; F21Y101/02
Domestic Patent References:
| JP8094844A | ||||
| JP7294745A | ||||
| JP2000330112A | ||||
| JP9212116A | ||||
| JP11242105A | ||||
| JP2001343532A | ||||
| JP2001093315A | ||||
| JP2001166299A | ||||
| JP2002025326A |
Attorney, Agent or Firm:
Masatake Shiga
Tadashi Takahashi
Takashi Watanabe
Suzuki Mitsuyoshi
Yasuhiko Murayama
Tadashi Takahashi
Takashi Watanabe
Suzuki Mitsuyoshi
Yasuhiko Murayama