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, 1986
Filed:
Sep. 13, 1984
Applicant:
Inventor:
Tetsuo Sato, Takasaki, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250201 ; 369 44 ;
Abstract
A digital audio disc player is equipped with a tracking/focus servo mechanism which automatically controls the tracking and focusing of a light beam projected on a disc. The vibration of an automobile or other vehicle containing the player is detected so that, when there is a significant amount of vibration, the control sensitivity of the tracking/focus servo mechanism is increased to prevent the occurrence of tracking and focusing errors.