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:
Feb. 13, 1996
Filed:
Jun. 15, 1994
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4428 ; 369 4427 ; 369 4433 ;
Abstract
A tracking control apparatus having a track jump detection device and a memory for storing driving signals for the tracking control detects a track jump, and when such a track jump has occured, makes the tracking control inoperative, decelerates the velocity of light beam caused by the track jump by driving a voice coil motor using signals inverted from the signals stored in the memory, and, thereby, restarts the tracking control quickly.