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:
Apr. 02, 1985
Filed:
Jul. 16, 1982
Applicant:
Inventor:
Kaoru Morinaga, Yokohama, JP;
Assignee:
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
369 752 ; 369270 ;
Abstract
A disc clamper includes a clamp member for holding a disc against a turntable and a support member for supporting the clamp member. The clamp member is provided with a permanent magnet, and the support member has a winding. The winding is coaxially arranged to the magnet. When a certain DC current is applied to the winding, the clamp member is subjected to an electromagnetic repelling force effected between the winding and the magnet. Then, the disc is fixed to the turntable by means of the electromagnetic repelling force, and the clamp member is mechanically free from the support member.