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. 15, 2007
Filed:
May. 24, 2004
Yoshitaka Shimoda, Saitama, JP;
Akira Shimizu, Saitama, JP;
Yuji Tawaragi, Saitama, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
An information recording and reproducing apparatus performs information recording and reproducing on an optical disc having a recording track wobbled by a predetermined frequency. The apparatus includes an optical pickup which irradiates a laser light on the optical disc and receives the laser light reflected by the optical disc to output an electric signal corresponding to the laser light, a push-pull signal generating unit which includes a sample-hold unit and generates the sample-hold push-pull signal and the non-sample-hold push-pull signal from the electric signal, a sample-hold circuit which samples and holds the push-pull signal, a recording clock generating unit which generates a recording clock synchronized with the wobble signal based on the sample-hold push-pull signal during recording and based on the non-sample-hold push-pull signal during reproduction, and a phase adjusting unit which adjusts the phases of the non-sample-hold push-pull signal and the sample-hold push-pull signal.