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:
Aug. 30, 2005
Filed:
Jun. 30, 2004
Parul Agrawal, Saratoga, CA (US);
Bradley Frederick Baumgartner, Los Banos, CA (US);
Norman Chu, San Francisco, CA (US);
Charles Lee, San Jose, CA (US);
Tony Mello, San Jose, CA (US);
Christopher Ramm, San Jose, CA (US);
Bob Clyde Robinson, Hollister, CA (US);
Parul Agrawal, Saratoga, CA (US);
Bradley Frederick Baumgartner, Los Banos, CA (US);
Norman Chu, San Francisco, CA (US);
Charles Lee, San Jose, CA (US);
Tony Mello, San Jose, CA (US);
Christopher Ramm, San Jose, CA (US);
Bob Clyde Robinson, Hollister, CA (US);
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
An in-situ technique for the acoustic emission monitoring of burnish heads while they are cleaning or burnishing magnetic media is described. The burnishing process is monitored and controlled to identify interaction or contact between the head and media due to, for example, burnish head damage, substrate curvature problems, and lube pick-up problems. A piezoelectric sensor is mounted on the burnish arm that holds the burnish heads. When head-disk interaction occurs, stress waves travel through the head to the sensor and an amplified signal is gathered in a tester database as an acoustic emission. Abnormal conditions will trigger an unusual emission that is detected to trigger an alert.