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. 07, 2009
Filed:
Nov. 09, 2005
Youichi Ogura, Ibaraki, JP;
Toshihiko Takahashi, Kawachinagano, JP;
Hiroaki Hayashi, Nara, JP;
Teruhiko Izumi, Hirakata, JP;
Dai Ichiryu, Hirakata, JP;
Shinichi Konishi, Nara, JP;
Youichi Ogura, Ibaraki, JP;
Toshihiko Takahashi, Kawachinagano, JP;
Hiroaki Hayashi, Nara, JP;
Teruhiko Izumi, Hirakata, JP;
Dai Ichiryu, Hirakata, JP;
Shinichi Konishi, Nara, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical disc recording/playback apparatus is provided with a first AD converterfor shaping a push-pull signaldetected from an optical disc mediumby a light difference signal shaping circuit, and converting the signal into a digital sampling signalusing a sampling clocksynchronized with a channel frequency; a series of means for detecting wobble amplitude informationduring recording from the digital sampling signal; a series of means for detecting address polarity informationand address position information during playback; and a recording laser power control circuitfor controlling a recording laser power to a power suited for recording on the basis of the wobble amplitude information.