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:
Apr. 14, 1992
Filed:
Sep. 12, 1988
Katsuhiro Tsuneta, Odawara, JP;
Toshiyuki Haruna, Odawara, JP;
Yuji Yoshida, Odawara, JP;
Akira Kojima, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A head positioning device for use in a magnetic disk equipment includes a position detector for detecting the deviation of a magnetic head from the center line of a desired track on a magnetic disk, a comparator for generating a polarity signal indicative of the direction of the deviation of the magnetic head from the center line of the desired track, on the basis of the output of the position detector, and a microcomputer for calculating a correction value necessary for the precise positioning of the magnetic head on the center line of the desired track. An optimum correction value is determined for each of a plurality of tracks on the basis of measurement, immediately after the power supply of the magnetic disk equipment has been turned on, and an actuator mounted with the magnetic head is driven on the basis of the correction values thus obtained, to position the magnetic head very accurately.