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. 10, 1989
Filed:
Mar. 05, 1987
Hideki Yoshihara, San Jose, CA (US);
Nicholas M Warner, Livermore, CA (US);
Unisys Corp., Detroit, MI (US);
Abstract
For a disk drive servo system using position and position-quadrature signals (P, Q), a method for automatically effecting 'Absolute Track Registration' and compensating for 'offsets' by using the peak position of one of signals (P or Q) to find 'true' position (true offset) for the other (Q or P) wherein the R/W actuator is brought to rest at a reference position and sample-offset signal generated; while the corresponding magnitude of related positioning signals are detected--this being repeated until the peak values of said positioning signals is located whereupon the corresponding position-offset is derived as 'true offset'--the actuator then being repositioned by this 'true offset' value; and repeating this for a given number of track sites across the disk.