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:
Jul. 26, 2005
Filed:
Aug. 26, 2002
Shun Kayama, Saitama, JP;
Kazuo Goto, Kanagawa, JP;
Yutaka Okazaki, Tokyo, JP;
Toshio Iwata, Kanagawa, JP;
Shun Kayama, Saitama, JP;
Kazuo Goto, Kanagawa, JP;
Yutaka Okazaki, Tokyo, JP;
Toshio Iwata, Kanagawa, JP;
Sony Corporation, , JP;
CDR Inc., , JP;
Abstract
A spindle motor that can be reduced in size and thickness and yet develops a high rotational torque, and an information recording and/or reproducing apparatus employing this spindle motor. A rotor R includes a turntablewhich carries and secures a disc-shaped recording medium D and which is rotatable relative to a fixed shaftvia a bearing, a ring-shaped first magnetsecured to the turntableand arranged inwardly of a coilhaving the fixed shaftas center, and a ring-shaped second magnetsecured to the turntableand arranged outwardly of the coilhaving the fixed shaftas center. The rotor R is rotated relative to the stator S, by a magnetic field generated in the coilon supplying the current to the coiland another magnetic field generated between the first and second magnetsand