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. 15, 1992
Filed:
Oct. 10, 1989
Applicant:
Inventor:
Haruyasu Sakata, Tokorozawa, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
369 4425 ;
Abstract
A tracking servo apparatus is disclosed which detects the change in the level of tracking error signal per unit time when the information reading spot passes a position on the track at its center in the converging period of the servo pull-in operation after a decelerating pulse has been generated and, when the amount of the detected change is over reference value, controls such that at least either one of the equalizer characteristic and the gain is changed for a predetermined period of time after the detection.