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:
Jan. 28, 1997
Filed:
Jul. 29, 1994
Gregory M Frees, Sunnyvale, CA (US);
Masakazu Sasaki, Kanagawa, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Some disk drives produce a relatively large amount of acoustical noise. This noise is generated by vibrations of the disk drive cover caused by movement of the spindle motor and/or actuator head. A disk drive assembly is provided that significantly reduces the amount of acoustic noise emanating from a disk drive. An enclosure for a disk stack assembly, comprising at least one disk, mounted on a spindle attached to a motor and an actuator assembly, comprising at least one head attached to an actuator, is provided. The enclosure has an inner chamber with a post extending outwardly from a surface of the inner chamber. A compressible material is disposed at one end of the post abutting in a compressed state an opposing surface of the inner chamber. In a preferred embodiment, the post is integrally formed with the inner chamber and is unattached from the opposing surface. The damping post is preferably positioned in a position of maximum deflection for the vibration mode of the assembly. The damping post mass is such that the device enclosure frequencies are shifted away from source excitation forces improving the disk drive acoustic performance.