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. 25, 2005
Filed:
Oct. 22, 2002
Tao Zhang, Shakopee, MN (US);
John Christopher Morris, Minneapolis, MN (US);
Thomas C. Zirps, Minnepolis, MN (US);
Tao Zhang, Shakopee, MN (US);
John Christopher Morris, Minneapolis, MN (US);
Thomas C. Zirps, Minnepolis, MN (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
A system and method for correcting repeatable runout errors during manufacture of a disc drive. The system includes a Kalman filter having a recursive learning gain input and includes a recursive learning Again-setting circuit coupled to the recursive learning gain input. The recursive learning gain is initially set based on an estimate of a ratio of non-repeatable run out error to an estimate of the repeatable run out error. On subsequent recursions, the recursive learning gain-setting is reduced.