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:
Apr. 21, 2009
Filed:
Jan. 26, 2004
Tomoyoshi Yamashita, Kanagawa, JP;
Yasuko Hayashi, Oita, JP;
Tomoyoshi Yamashita, Kanagawa, JP;
Yasuko Hayashi, Oita, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
An area light source comprising an LED primary light source (), a plate-like light guide () and a light deflector () is provided with a direct light incoming prevention means closed of a light-blocking member (). The light guide () has a light incoming end face () and a light outgoing face () and guides a light emitted from the LED primary light source (). The light deflector () is arranged adjacently to the light outgoing face () and has a light entering face () and a light exiting face (). The direct light incoming prevention means prevents a light, which is emitted from the LED primary light source (), from entering into the light deflector () without passing through the light guide (). The light-blocking deflector () is disposed on a first region of the light outgoing face () which is located near the edge of the light incoming end face side of the light outgoing face (). The surface of the light-blocking member () facing the light outgoing face () is a diffusing reflective surface. The light deflector () is disposed on a second region of the light outgoing face () where the light-blocking member () is not arranged.