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. 16, 2003
Filed:
Sep. 20, 2001
Apparatus and method for glide height calibration of disk surfaces by use of dual-zone laser texture
Bradley Frederick Baumgartner, Los Banos, CA (US);
James Hammond Brannon, Palo Alto, CA (US);
Jorge Daniel Colonia, San Jose, CA (US);
Huyen D. Do, San Jose, CA (US);
Shanlin Duan, Fremont, CA (US);
Connie H. Moy, San Jose, CA (US);
Hang Fai Ngo, San Jose, CA (US);
Yu Lo, Fremont, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A disk for calibrating glide heads utilizes a dual-zone configuration of multiple laser melt bumps having selected heights. Averaging the PZT response over many bumps significantly narrows the response distribution, resulting in greater certainty and correlation of the PZT amplitude to bump height. The multiple calibration bumps are circumferentially arranged on a disk surface at a selected radius in a ring-like manner. A second head cleaning zone is provided near the inner diameter of the disk to provide for increased reproducibility of the PZT calibration response. The second zone is densely textured and serves to clean the glide head prior to its use in the calibration zone.