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. 06, 1988
Filed:
Feb. 03, 1986
Applicant:
Inventors:
Saburo Funada, Tokyo, JP;
Masanori Doi, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 45 ; 250201 ; 369 46 ;
Abstract
A focus servo control device has a focus driver for driving an optical system having an objective lens, and a servo control section for detecting that the optical system is within a focus servo control range. A focus servo control loop is formed in response to a detection signal representing that the optical system is in the focus servo control range, and the optical system is driven under servo control until the amount of light reflected by the optical disk is detected as a maximum.