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. 13, 2001
Filed:
May. 11, 1998
Susumu Sensyu, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
In an optical disc manufacturing method and an optical disc device, when serial data are subjected to phase modulation and then subjected to frequency modulation to trace a groove, in modulated signals based on phase modulation corresponding to the first half portion and the last half portion of each bit of the serial data, the phase modulation is performed so that the period of the logic “1” and the period of the logic “0” are equal to each other. In the modulated signals based on the frequency modulation, the number of the frequency cycles corresponding to the respective logic levels are equal to each other.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile