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. 05, 1985
Filed:
Aug. 11, 1982
Tadashi Saito, Yokohama, JP;
Shigemitsu Higuchi, Yokohama, JP;
Kazutoshi Konno, Yokosuka, JP;
Tohru Sampei, Kanagawa, JP;
Kenji Hayashi, Kamakura, JP;
Yoshihiko Noro, Yokohama, JP;
Manabu Wakabayashi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A tracking servo system for a magnetic recording and reproducing apparatus uses a flexible magnetic disk having thereon at least first, second and third tracks each of which includes a data track portion and a pair of servo track portions located on both sides of the data track portion. Tracking signals having different frequencies are recorded on the first, second and third servo track pairs. Servo and data heads are formed in a unitary structure. When the data head records an information signal on the second data track portion or reads out the recorded information signal therefrom, the servo head reads out the tracking signals recorded on the first and third servo track portions.