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:
Mar. 26, 1991
Filed:
Jun. 18, 1987
Applicant:
Inventor:
Robin J Freeze, Milpitas, CA (US);
Assignee:
Qume Corporation, Milpitas, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G05D / ;
U.S. Cl.
CPC ...
360 7806 ; 360 7704 ; 360 7812 ; 369 32 ; 369 4432 ; 318561 ; 318632 ;
Abstract
A servo system for compensating for environmental forces acting on, for example, a disk drive. A circuit is provided for causing an electrical current to flow in the voice coil controlling a read/write head; the head is caused to seek a predetermined track; and a device adjusts the current delivered to the voice coil so that the force generated thereby at least approximately balances environmental forces acting upon the voice coil so that the read/write head does not move by more than a predetermined amount from said predetermined track.