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. 26, 2001
Filed:
Jun. 16, 1999
Takanari Kusafuka, Yoro-gun, JP;
Masahiro Higuchi, Anpachi-gun, JP;
Kenkiti Okamoto, Kagamigahara, JP;
Michiaki Sato, Ichinomiya, JP;
Yoshiaki Yamada, Ogaki, JP;
Kenji Kiyota, Ogaki, JP;
Sanyo Electric Co. Ltd., Osaka, JP;
Abstract
The present invention provides a light guide plate and a surface light source using the light guide plate to improve the utilization efficiency of external light and light from an internal light source and to achieve thinner width of the light guide plate. In this invention, internal light emitted from an internal light source,is brought to the inside of the light guide plate,from an internal light collecting surface,in the light guide plate,, and external light such as natural light is brought to the inside of the light guide plate,from an external light collecting portion,. The light brought to the inside of the light guide plate reflects and is converged several times from a reflective plate,mounted to the outside of the light reflective surface,and three side end surfaces,and is emitted from the light emissive surface,of the light guide plate,to a diffusing plate,. The light incident to the diffusing plate,is diffused uniformly within the desired angle range by the diffusing plate,and a lens sheet,, and is emitted from the lens sheet,as synthesized light.