The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2012
Filed:
Aug. 04, 2009
Tatsuo Uchida, Sendai, JP;
Yoshito Suzuki, Sendai, JP;
Tohru Kawakami, Sendai, JP;
Takahiro Ishinabe, Sendai, JP;
Baku Katagiri, Sendai, JP;
Yoshihiro Hashimoto, Osaka, JP;
Shoichi Ishihara, Osaka, JP;
Shuichi Kozaki, Osaka, JP;
Yutaka Ishii, Osaka, JP;
Tatsuo Uchida, Sendai, JP;
Yoshito Suzuki, Sendai, JP;
Tohru Kawakami, Sendai, JP;
Takahiro Ishinabe, Sendai, JP;
Baku Katagiri, Sendai, JP;
Yoshihiro Hashimoto, Osaka, JP;
Shoichi Ishihara, Osaka, JP;
Shuichi Kozaki, Osaka, JP;
Yutaka Ishii, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Tohoku University, Sendai, JP;
Abstract
Surface light source device includes: point light sources (); light guide plate () having (i) two end parts in length direction, one of which serves as incident surface (), and (ii) two end parts in thickness direction which serve as exit surface () and back surface (), light guide plate () directing light, emitted from point light sources (), incident on incident surface (), so as to cause light to exit from substantially entire area of exit surface (); and reflector () which reflects, toward incident surface (), part of light which is emitted from point light sources () and is then reflected from incident surface (). Incident surface () has elliptic arc () which is concave part having surface shape along elliptic arc identical to elliptic arc which is part of ellipse () having two focal points corresponding to point light sources () and reflector (). Point light sources () and reflector () are provided on ellipse focal point lines (and) obtained by moving two focal points in width direction of light guide plate ().