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:
Feb. 02, 1993
Filed:
Dec. 06, 1991
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 a data recording disk and disk head for recording data and reproducing data from the disk. Arms support the disk head. An actuator drives the arm moving the disk head to a predetermined data recording track of the disk. A spindle motor rotates the disk. An actuator unit moves the disk head to select a track on the disk. First positioning data for positioning the disk head is provided on at least one data surface. Second positioning data is provided at at least one data surface. A control is coupled to the actuator for controlling the positioning of the disk head and the searching of the disk in response to the first and second positioning data. The second positioning data may be located on positioning tracks not used for data. The second positioning information as part of a second positioning data is stored. The disk head position is compensated by the stored second positioning information which is superimposed with the first position data.