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. 11, 1995
Filed:
May. 26, 1994
Fumio Tajima, Juo, JP;
Hiroshi Kanazawa, Hitachi, JP;
Hiroshi Katayama, Hitachi, JP;
Kazuo Ohnishi, Kasukabe, JP;
Tadashi Takahashi, Hitachi, JP;
Nobuyoshi Mutoh, Katsuta, JP;
Shigeki Morinaga, Hitachi, JP;
Nobuyoshi Tsuboi, Toukai, JP;
Hideki Nihei, Hitachioota, JP;
Hitachi, Ltd., Tokyo, JP;
Japan Servo Co., Ltd., Tokyo, JP;
Abstract
A motor has a stator and a rotor, the stator having cores and drive coils which generate magnetic fields for rotating the rotor. The stator also has a yoke surrounding the rotor and the rotor is positioned such that it is closer to one part of the outer periphery of the yoke than another part of the outer periphery of the yoke. Such a motor is particularly suitable for use in a disk drive unit as a spindle motor for rotating the disk. Then an actuator for moving a head may be located adjacent the part of the outer periphery of the yoke which is closest to the rotor. This permits the head to approach closely the axis of rotation of the disk without the spindle motor interferring with the movement of the head. The continuous yoke prevents magnetic flux leakage from the spindle motor interferring with the actuator. The actuator may itself have a yoke integral with the yoke of the spindle motor, and/or other components in common.