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. 21, 1995
Filed:
May. 27, 1994
Yotaro Sanada, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A magnetic head positioner for a magnetic disk apparatus has a holder arm for swinging a plurality of magnetic heads mounted on one end thereof for reading and writing data, the holder arm having a center portion thereof provided with a cylindrical boss portion, a fixed shaft provided on a center axis of the cylindrical boss portion of the holder arm and acting as a center axis of the swing motion of the holder arm, a cylindrical sleeve interposed between the holder arm and the fixed shaft and rotatably supported on the fixed shaft with a predetermined gap with respect to an inner side surface of the cylindrical boss portion of the holder arm, the cylindrical sleeve having flange members at opposite end portions thereof covering the cylindrical boss portion with a predetermined gap with respect thereto and a motor mounted in between the fixed shaft and the cylindrical sleeve for generating force for rotating the cylindrical sleeve about the shaft. On either of the holder arm or the cylindrical sleeve, grooves for generating dynamic hydraulic pressure are formed and configuration of the grooves is an outward type, an inward type or a herringbone type configuration.