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. 08, 2014
Filed:
Apr. 19, 2012
Takeshi Nakao, Sagamihara, JP;
Kunikazu Ohnishi, Yokosuka, JP;
Hiromi Kita, Hiratsuka, JP;
Norio Hosaka, Yokohama, JP;
Takeshi Nakao, Sagamihara, JP;
Kunikazu Ohnishi, Yokosuka, JP;
Hiromi Kita, Hiratsuka, JP;
Norio Hosaka, Yokohama, JP;
Hitachi Media Electronics Co., Ltd., Yokohama-Shi, Kanagawa, JP;
Abstract
Optical beams emitted by optical sources are incident on a mirror surface of a scan mirror in a substantially vertical direction and reflected in a substantially vertical direction by the scan mirror. The mirror surface of the scan mirror is driven to repeatedly rotate two-dimensionally by a predetermined scan angle by a scan mirror drive circuit. A polarized beam splitter causes the optical beam emitted by the optical source to be incident on the scan mirror through a quarter wave plate, and outputs the optical beam that has been reflected by the scan mirror and passed through the quarter wave plate toward the screen. A scan angle expander is arranged on the output side of the polarized beam splitter, whereby the scan angle of the optical beam is increased by N times.