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:
Jul. 28, 1998
Filed:
Jan. 15, 1997
Applicant:
Inventors:
Assignee:
Canon Denshi Kabushiki Kaisha, Chichibu, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 7701 ; 60 7708 ; 60 7712 ; 60135 ;
Abstract
A servo pattern for controlling a head position has a first pattern in which two frequency signals having respectively different frequencies are arranged alternately in the width direction of a track in a two-track cycle, and a second pattern which is repeated in a cycle of n tracks. The first and the second patterns are arranged in the longitudinal direction of the tracks so as to create a servo pattern with a wide servo capture range and so as also to ensure accurate detection.