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:
Sep. 23, 1986
Filed:
Jul. 15, 1985
Applicant:
Inventors:
Yasunori Kobori, Yokohama, JP;
Hideo Nishijima, Katsuta, JP;
Kaneyuki Okamoto, Katsuta, JP;
Isao Fukushima, Katsuta, JP;
Katsuhiko Goto, Mito, JP;
Takashi Takahashi, Katsuta, JP;
Assignees:
Hitachi Microcomputer Hitachi, Ltd., Tokyo, JP;
Engineering, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 70 ; 360 102 ;
Abstract
An auto-tracking method and apparatus of a helical scan type magnetic recording/reproducing apparatus wherein envelope levels of reproduced signals are detected and the running phase of a magnetic tape is controlled so that the envelope level of the reproduced signal becomes maximum after detection is effected roughly and then finely, thereby allowing a video head to scan a track on the magnetic tape.