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:
May. 03, 2005
Filed:
Mar. 20, 2002
Applicant:
Hiroshi Maegawa, Kanagawa, JP;
Inventor:
Hiroshi Maegawa, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., , JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B007/095 ;
U.S. Cl.
CPC ...
Abstract
A wobble detection circuit detects a signal by a common photodetector (light receiving) element from several kinds of media having different pre-formats. Further, the wobble detection circuit changes a gain for amplifying the signal in a wobble signal detection process depending on the pre-format of a reproducing or recording medium to obtain a wobble signal.