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:
Aug. 20, 1991
Filed:
Jun. 27, 1990
Applicant:
Inventors:
Hiroto Kitai, Tokyo, JP;
Keiji Tsuchiya, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 32 ; 369 44 ; 360 7804 ;
Abstract
Disclosed is a method of seeking a desired track by scanning a recording medium having a plurality of tracks formed thereon by a light spot in a direction across the tracks, and counting track crossing signals detected from the reflected light or the transmitted light of the spot. In this method, of the track crossing signals, only those signals which are detected within a predetermined time inteval are counted as a correct track crossing signal. An apparatus for carrying out such a method is also disclosed.