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:
Aug. 10, 1999
Filed:
Jul. 18, 1996
Masahito Kobayashi, Ibaraki-ken, JP;
Takashi Yoshida, Ibaraki-ken, JP;
Takashi Yamaguchi, Tsuchiura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A positioning adaptive control method and positioning device which allow rapid positioning of a head by speed-controlling a seek operation in an information storage device such as a magnetic disk unit. The seek operation moves the head to a vicinity of a target track and a following operation causes the head to accurately follow a position on the target track when the head is positioned in the vicinity of the target track. These operations are controlled based on data recorded in sectors formed on a recording plane of a disk. A variable gain of an acceleration feed forward signal is controlled sequentially by an adaptive control rule so that a deviation signal between a target speed and an actual speed of the head is reduced when the speed of the head is shifted from an acceleration or constant speed state to a deceleration state under speed control. The variable gain of the acceleration feed forward is used per each sampling for the adaptive control rule and a square value of the speed deviation signal is minimized.