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:
Sep. 03, 1991
Filed:
May. 25, 1988
Applicant:
Inventor:
Shigeru Shimonou, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 32 ; 360 7809 ; 369 4428 ;
Abstract
A controller for moving a transducer between recording tracks, comprising a current driven actuator for accelerating and decelerating the transducer for determined periods, position and velocity detectors of the transducer at the end of deceleration, error signal generators for the final position and velocity, and circuitry for increasing or decreasing periods of acceleration and deceleration based on the error signals.