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:
Oct. 29, 2013
Filed:
Mar. 18, 2011
Hideki Nakata, Kyoto, JP;
Hidenori Wada, Kyoto, JP;
Masahito Nakao, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
There are provided an optical head and an optical information device capable of downsizing the optical head, and capable of improving the qualities of a focus error signal, a tracking error signal, and a reproduction signal. A light detector () includes a light-receiving unit () for receiving a reflected light beam from an optical disc, and a package () for covering the light-receiving unit (). The package () has a plurality of light guides () formed on a light-receiving surface on the light beam incident side of the light-receiving unit (), and for guiding a reflected light beam to the light-receiving unit (), and a light shield () for shielding a region except for a plurality of the light guides () from light.