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:
Aug. 27, 1985
Filed:
Sep. 15, 1982
Applicant:
Inventors:
Osamu Hattori, Chigasaki, JP;
Shingo Tamura, Yokohama, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 43 ; 369126 ; 369215 ; 369244 ;
Abstract
A pickup device for compensating for jitter by driving a scanning needle in the direction of a record track on a disc comprises a resiliently held support which supports a cantilever having the scanning needle mounted thereon and a permanent magnet mounted at an end thereof, and a driver to which a drive current is supplied to generate a magnetic field to be acted on the permanent magnet. A drive force created by the action of the magnetic field is in parallel to a surface of the disc so that the scanning needle is driven in parallel to the surface of the disc.