Title:
面光源及び表示装置
Document Type and Number:
Japanese Patent JP4774035
Kind Code:
B2
Abstract:
A surface light source includes a light source and an optical waveguide plate. The light source serves to emit light. The optical waveguide plate has an incident end face where the light is incident and a light exit surface where the light incident on the incident end face exits. Further, the optical waveguide plate has a refractive index n. The incident end face has a plurality of concave portions. The angle between a plane formed by the plurality of concave portions and a tangent plane of the incident end face is not more than (90−2·arcsin(1/n)) degree.
Inventors:
Shin Ito
Masato Sumikawa
Yutaka Okada
Masato Sumikawa
Yutaka Okada
Application Number:
JP2007338458A
Publication Date:
September 14, 2011
Filing Date:
December 28, 2007
Export Citation:
Assignee:
Sharp Corporation
International Classes:
F21S2/00; F21V8/00; G02B6/00; G02F1/13357; F21Y101/02
Domestic Patent References:
| JP2003059323A | ||||
| JP2002258283A | ||||
| JP10247412A | ||||
| JP10255530A | ||||
| JP2006154292A | ||||
| JP2006040710A | ||||
| JP54164377A | ||||
| JP2001067919A |
Attorney, Agent or Firm:
Yoshinori Hirai