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. 03, 2008
Filed:
Mar. 02, 2004
Tomoyoshi Yamashita, Kanagawa, JP;
Masae Ono, Kanagawa, JP;
Makoto Ookawa, Kanagawa, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
An optical deflector element has a light incoming surface () in which light enters and a light outgoing surface () located opposite the light incoming surface and from which light exits. In the light incoming surface () are arranged elongated prisms (A) in parallel to each other. Each of the elongated prisms (A) is formed by a top end flat face () located at the top end of the elongated prism and having an inclination angle (b) of 1 to 50 degrees, a first prism face () located at one side of the flat face, and a second prism face () at the other side. A light source device is formed by combining the optical deflector element, light guide and a primary light source. The light guide has a light incident face in which light emitted from the primary light source enters, and a light emitting face from which guided light exits. The combination above provides a light source device that does not have degradation in luminance and has excellent quality free from visual defects including a black stripe and a Moire pattern.