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:
Mar. 02, 1999
Filed:
Oct. 30, 1997
Peter Everett Brooks, Rochester, MN (US);
Western Digital Corporation, Irvine, CA (US);
Abstract
A head disk assembly includes a base, a cover attached to the base and a spindle motor mounted to the base. The spindle motor includes a shaft, an inner cylindrical portion surrounding the shaft, and an outer cylindrical portion surrounding the inner cylindrical portion. The outer cylindrical portion has an annular surface and the inner cylindrical portion has a cylindrical surface which extends above the annular surface. The head disk assembly also includes a disk mounted on the spindle motor such that the disk surrounds the outer cylindrical portion; the disk includes a recording surface which is substantially co-planar with the annular surface. The head disk assembly also includes a disk clamp for clamping the disk to the spindle motor and a washer positioned between the disk clamp and the recording surface for transferring radial loads to the inner cylindrical portion of the spindle motor. The washer includes an inner perimeter which defines a plurality of segments, each segment bounded by a pair of openings and each segment having a contact surface such that each contact surface contacts a respective portion of the cylindrical surface of the inner cylindrical portion.