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:
Mar. 08, 1994
Filed:
Dec. 10, 1992
Applicant:
Inventor:
Shigeru Shimonou, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4425 ; 369 4428 ; 369 4429 ; 369 4432 ; 369 54 ;
Abstract
A stable and rapid track access control device capable of preventing, in the event of driving a converging lens of an optical disk drive to move a light beam, the lens from moving excessively. Assume that when the lens is driven to move the light beam, the movement of the lens exceeds a range which an optical lens can follow, increasing the positional deviation of the lens relative to the head. Then, the movement of the lens is so regulated as to equalize the speed of the lens and that of the head relative to each other.