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:
Nov. 27, 2001
Filed:
Mar. 27, 2000
Applicant:
Inventors:
Yoshinori Kakuta, Nagaokakyo, JP;
Akira Sakuta, Nagaokakyo, JP;
Masami Tomita, Nagaokakyo, JP;
Kunihiko Nakagawa, Nagaokakyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/09 ; G11B 1/920 ;
U.S. Cl.
CPC ...
G11B 7/09 ; G11B 1/920 ;
Abstract
A disc apparatus for recording information to and reproducing information from a disc includes a turntable with a magnetized surface; an excitation coil disposed opposite the magnetized surface of the turntable; a drive circuit driving a focus actuator; a detector detecting focusing error; and a control circuit. The control circuit controls energization of the excitation coil in accordance with the detector so as to move the turntable in the axial direction via the magnetic force between the excitation coil and the magnetized turntable.