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:
May. 16, 1989
Filed:
Jun. 19, 1987
Takahiko Tsujisawa, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A head positioning system capable of positioning a magnetic head at the center line of a target track of a floppy disk at high speed, in which a positioning controller prepositions the magnetic head within a predetermined distance from the center line of the target track based on a position error signal indicating the deviation of the magnetic head from the center line of the target track. A positioning compensation controller generates a compensation signal whose frequency is twice the disk rotational frequency so that the positioning compensation controller positions the magnetic head at the center line of the target track. A switching compensation controller connected to the positioning compensation controller enables the compensation signal to equal the output of the initial positioning controller during the prepositioning operation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile