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. 22, 1994
Filed:
May. 28, 1992
Applicant:
Inventor:
Shosuke Tanaka, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
3692752 ; 369 4432 ; 369 4426 ; 3692753 ; 360 7704 ;
Abstract
An area for recording a preformated encoding pattern is provided on a rewritable disk in order to obtain information of an eccentricity produced when the disk is chucked. The information of the eccentricity produced at the time of disk chucking is detected, while the disk is being driven, from a reference pulse obtained by reproduction of the encoding pattern and, on the basis of the eccentricity information, the frequency of the clock for writing data or reading data is modulated according to eccentric positions.