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:
Dec. 05, 1995
Filed:
Sep. 02, 1994
Yotaro Sanada, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A magnetic head positioner for a magnetic disk apparatus has an arm holder rotatably supported on a shaft by a plurality of bearings. The arm holder provides a plurality of arms carrying magnetic heads for writing and reading data at tip ends thereof. A first cylindrical sleeve is interposed between the bearings and the arm holder and fixed to the outer peripheral surface of the bearings. The first cylindrical sleeve is also made of a material having a linear expansion coefficient substantially the same as that of the shaft. A pair of second cylindrical sleeves are interposed between the bearings and the arm holder and fixed to the first cylindrical sleeve at one end portion thereof and to the inner peripheral surface of the arm holder at the other end portion thereof. The pair of second cylindrical sleeves are also made of a material having substantially the same linear expansion coefficient substantially as that of the arm holder. Thermal offtracking of the magnetic heads with respect to the disk is thus minimized.