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. 30, 2003
Filed:
Apr. 03, 2000
Applicant:
Inventors:
Ichiro Watanabe, Kawasaki, JP;
Takayuki Kawabe, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 1/926 ;
U.S. Cl.
CPC ...
G11B 1/926 ;
Abstract
A track jump control unit adds an FF signal for repetitive disturbance compensation obtained by a learning control which is used in a track-following control and a final value of an FB control low band component just before a track jump to a track jump signal to move a light spot to an adjacent track, thereby driving a carriage. As a track jump signal, a first kick pulse of a predetermined acceleration and a predetermined time, a second kick pulse which continues at a predetermined acceleration until a detection of a track zero-cross point, and a brake pulse of a predetermined acceleration (deceleration) and a predetermined time are used.