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:
Oct. 01, 1991
Filed:
Jul. 15, 1988
Yoshihisa Okawa, Tokyo, JP;
Terumitsu Okamoto, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
For controlling a relative position between a magnetic head (15) and a recording medium (10) having a control area (14) indicative of a tracking axis for the magnetic head, a position controlling unit comprises a producing arrangement (28) for producing a position signal, and a control arrangement (29) for controlling the relative position in response to the position signal in a predetermined direction which intersects the tracking axis. More particularly, the producing arrangement comprises a first producing, a second producing, and a processing arrangements (31, 32, 33). Responsive to the detection signal, the first producing arrangement produces a first signal. The processing arrangement processes the first signal into a second signal. Responsive to the first and the second signals, the second producing arrangement produces the position signal. Preferably, the control area has a main area (17) indicative of the tracking axis, and a supplementary area (18) preceding the main area. The magnetic head is for detecting the main and the supplementary areas to produce a main and a supplementary detection signal which collectively serves as the detection signal.