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:
Jun. 17, 2003
Filed:
Aug. 03, 1999
Toshiyuki Kashiwagi, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical disk has a groove formed in the direction of a recording track and a first information signal is recorded by forming a row of marks or dots on the groove or land. A second information signal can also be recorded on the groove or land without adversely affecting the playback characteristic of the first information signal. A groove is formed in the direction of the recording track and a row of marks or dots corresponding to the first information signal is formed on the groove or land, so that the first information signal can be recorded. Further, by forming a wave having a spatial frequency higher than a cut-off frequency of a playback optical system corresponding to a second information signal on a part or all of the groove, the second information signal is recorded. The second information signal can represent visible information.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile