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:
Oct. 12, 1989
Applicant:
Inventor:
Ryoichi Imanaka, Hirakata City, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4428 ; 369 4429 ; 369 4432 ; 369 4435 ;
Abstract
A gain crossover frequency in a tracking servo system for a disc-shaped optical record medium is lowered during an application of a track jump signal to the tracking servo system for jumping from one track to another, thereby removing the tracking jump operation from the servo system, and performing a sure-footed track jump operation; whereas, displacement of the scanning point, which is slower than the response speed corresponding to the lowered gain crossover frequency, is corrected even during the track jump operation.