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:
Mar. 30, 2010
Filed:
Aug. 31, 2007
Akihiro Tachibana, Tsurugashima, JP;
Satoru Tanaka, Tsurugashima, JP;
Yoshihisa Itoh, Tsurugashima, JP;
Yoshihisa Kubota, Tsurugashima, JP;
Kazuo Kuroda, Tsurugashima, JP;
Satoshi Sugiura, Tsurugashima, JP;
Akihiro Tachibana, Tsurugashima, JP;
Satoru Tanaka, Tsurugashima, JP;
Yoshihisa Itoh, Tsurugashima, JP;
Yoshihisa Kubota, Tsurugashima, JP;
Kazuo Kuroda, Tsurugashima, JP;
Satoshi Sugiura, Tsurugashima, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A holographic recording and reproducing apparatus comprises: a pickup for moving an objective lens that focuses a coherent light beam along a recording track on a holographic recording medium and for detecting reflected light from the recording track to perform focus- and tracking-servo control; a relative velocity determination unit for determining a relative velocity of a converging position of the objective lens with respect to the holographic recording medium; a driving unit for changing a relative position of the objective lens with respect to an optical path of the coherent light beam so as to make the relative velocity fall within a predetermined range at least during a predetermined period; and a control unit for performing recording or reproduction for a recording layer during the predetermined period. The holographic recording medium includes a plurality of markers used for positioning an optical interference pattern of the coherent light beam.