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:
Nov. 11, 1986
Filed:
Oct. 05, 1984
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 78 ;
Abstract
A magnetic storage disk tracking system employing a stepping motor is operable to compensate the tracking error within a certain expected range caused by the hysteretic movement of the motor. The system incorporates means for recognizing the track to which the magnetic head is positioned and memory means in which is stored data for compensating the positioning error depending on each track. The stepping motor is controlled through the excitation voltage of each winding under modulation in terms of the magnitude or duty cycle in compliance with the stored data.