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:
Jun. 11, 1991
Filed:
Feb. 15, 1990
Yoshiro Koga, Suwa, JP;
Akihiro Gomi, Suwa, JP;
Takashi Miyasaka, Suwa, JP;
Yasunaga Miyazawa, Suwa, JP;
Kenichi Endo, Suwa, JP;
Junichiro Shinozaki, Suwa, JP;
Kaneo Yoda, Suwa, JP;
Takashi Ichikawa, Suwa, JP;
Hitoshi Miyasaka, Suwa, JP;
Chiharu Kaburagi, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A disk drive includes media for recording data, disk heads for recording data and reproducing data on the disks. The heads are supported on arms. A head actuator drives the arms moving the head to a predetermined data recording track on the disk. A spindle motor rotates the disk at a predetermined rotating speed. The spindle motor includes a rotor magnet disposed within a stator coil. The disk head and actuator motor are mounted on a pivot on opposed sides of each other. To control head positioning, first positioning data for positioning the disk heads and second positioning data are provided on each data surface. This data is detected by a data head. Second positioning data may be positioned on tracks not used for containing data. The head position is compensated by the stored second positioning information superimposed on the first positioning data.