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:
Dec. 30, 1997
Filed:
Oct. 08, 1996
Ryo Ando, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A spindle rotational information is obtained and a positive spindle servo control or a recording operation control is carried out in the case that CLV servo is performed in reference to a groove information. A recording or reproducing device corresponding to a disc having some recording trucks formed therein by grooves wobbled in response to their absolute positional information is comprised of the information reading means 3, the frequency information extracting means 7, 10 for extracting groove frequency information, the frequency measuring means 21, the rotational servo means 9 and the control means 11. The control means 11 controls an operation of the rotational servo means in response to the result of measurement performed by the frequency measuring means 21. In the recording device, the control means 11 controls a recording operation timing with the recording means by using the result of measurement performed by the frequency measuring means 21.