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:
Jul. 29, 2008
Filed:
Sep. 21, 2006
Yuzo Shimizu, Osaka, JP;
Takeshi Matsuda, Osaka, JP;
Yuzo Shimizu, Osaka, JP;
Takeshi Matsuda, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
Disclosed is a light receiving device for reading an optical medium compliant with any of different standards. The receiving device includes light receiving elements and an amplifier circuit. Each light receiving element is for receiving light reflected from an optical medium compliant with a different one of the standards and output a signal responsive to the received light. The amplifier circuit is for amplifying a signal derived from output of the light receiving elements. The signal amplified by the amplifier circuit is derived by subtracting an output signal of one of the light receiving elements that receives light from the optical medium from an output signal of the other light receiving elements.