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:
Nov. 06, 1990
Filed:
Jul. 24, 1987
Applicant:
Inventors:
Ryuichi Negishi, Chichibu, JP;
Toru Okada, Kumagaya, JP;
Assignee:
Canon Denshi Kabushiki Kaisha, Chichibu, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 66 ; 360 7703 ; 360 7813 ;
Abstract
In a disc storage unit capable of writing a servo signal for positioning a recording head at each track defined on a disc-shaped recording medium, data in a region between adjacent tracks are erased prior to the writing of the servo signal. The data stored on the recording medium are completely erased and then the servo signal can be written in the recording medium.