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:
Sep. 08, 1998
Filed:
Mar. 24, 1995
Hiroshi Koriyama, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A magnetic disk device has a spindle shaft rotatably supported by bearings, a plurality of magnetic disks directly mounted on an outer peripheral side of the spindle shaft and being stacked in an axial direction of the spindle shaft, a plurality of spacer rings directly mounted on the outer peripheral side of the spindle shaft and respectively interposed between the plurality of magnetic disks, and a clamp ring mounted on the top of the spindle shaft for tightly fixing the plurality of magnetic disks and the plurality of spacer rings to the spindle shaft. The device also has a center shaft provided with inner race members which are in contact with inner peripheral surfaces of bearings, an arm holder including a cylinder member formed in a center portion thereof and arm members connected at one end portion to magnetic heads corresponding to respective magnetic disks and at another end portion to the outer peripheral side of the cylinder member. A cylindrical support member is directly in contact with outer peripheral surfaces of the bearings and fixed to the arm holder at both end portions thereof by an arm clamp ring with a prescribed small gap formed between an outer peripheral surface thereof and an inner peripheral surface of the cylinder member of the arm holder and rotatably supported on the center shaft. A voice coil motor reciprocates the magnetic heads along the radial direction of the magnetic disks by the arm holder.