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. 19, 1995
Filed:
May. 16, 1994
James A Valent, Longmont, CO (US);
Maxtor Corporation, Longmont, CO (US);
Abstract
An improved method for compensating for the irregularity in the torque constant of the electric motor used to move the actuator arm carrying the magnetic read/write head in a disk drive is disclosed. The torque constant of the electric motor varies across the operating range on a given drive as a function of head location and the variation in torque constant is compensated for with a torque constant multiplier. The present invention provides a method for accurately determining the torque constant multiplier versus position function of a particular disk drive. In one embodiment, the method of the present invention includes the steps of: determining a nominal operating range for the location of a head over a disk for substantially all disk drives manufactured with the same manufacturing process; determining the offset of the operating range of a particular disk drive relative to the nominal operating range; modifying the location of the head, as determined by reading servo information, of the particular disk drive based on the offset; and obtaining the value of the torque constant multiplier associated with the modified head location.