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:
Sep. 29, 1987
Filed:
Jun. 26, 1986
Shunji Kitamura, Hanno, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
According to the invention, a magnetic head positioning control apparatus using an index servo data has a circuit for determining a final correction value such that a magnetic head position correcting operation is repeatedly performed at a designated track position. The apparatus also has a circuit for obtaining final correction values for two different tracks, to calculate a thermal offset value accordingly. A correction current value and a track position can be expressed by a linear relation, and two coefficients of the relation can be determined using the two final correction current values. When an arbitrary track position is designated, a thermal offset value can be determined with reference to the two coefficients of the relation and the designated track position.