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. 11, 2005
Filed:
Feb. 07, 2002
Naoharu Yanagawa, Tokorozawa, JP;
Masahiro Kato, Tokorozawa, JP;
Tatsuhiro Yone, Tokorozawa, JP;
Yuko Muramatsu, Tokorozawa, JP;
Shinji Suzuki, Tokorozawa, JP;
Naoharu Yanagawa, Tokorozawa, JP;
Masahiro Kato, Tokorozawa, JP;
Tatsuhiro Yone, Tokorozawa, JP;
Yuko Muramatsu, Tokorozawa, JP;
Shinji Suzuki, Tokorozawa, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A plurality of light receiving detectors receive a plurality of segments of a beam returning from an optical disc when a reading beam of light is radiated to the optical disc. An optical pickup assembly produces a plurality of signals from the beam segments in accordance with, for instance, optical intensities of the beam segments. A level adjusting circuit adjusts signal levels of these signals such that each of the signal levels of the signals becomes equal to a reference level. The reference level is determined from at least one of the signal levels of the received beam segments.