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:
Oct. 24, 2000
Filed:
Apr. 14, 1997
John L Grimsley, Los Altos, CA (US);
Oak Technology, Inc., Sunnyvale, CA (US);
Abstract
The invention provides methods and apparatus for compensating for disc runout. In an exemplary embodiment, a data-storage device is provided which includes a rotatable disc and a data head for accessing the disc. The device includes a runout calibration system comprising positioning mechanics coupled to the head for moving the head relative to the disc. A servo loop incorporates the positioning mechanics and generates a drive signal used to control the positioning mechanics. A memory, having an input and an output coupled to the loop, is also provided for recording a plurality of samples of the drive signal. The memory then plays back those samples into the feedback loop at first periodic angular increments forming a calibrating drive signal.