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. 14, 1994
Filed:
Apr. 28, 1992
Applicant:
Inventors:
Assignee:
Fujitsu Limited, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 7704 ; 360 7705 ; 360 7708 ;
Abstract
A data head offset detecting circuit in a magnetic disk unit includes a first offset detector that detects an offset .beta. based on servo information on a data surface read by the data head, a second offset detector that detects an offset .gamma. based on servo information on the servo surface read by the servo head, and an offset calculator for calculating a real offset .alpha. resulting from the subtracting of the offset .gamma. from the offset .beta.. By using the above circuit, an offset for a correction of an offtrack is detected accurately even when the heads are vibrating.