Title:
FEED DEVICE OF MAGNETIC HEAD
Document Type and Number:
Japanese Patent JPS5930269
Kind Code:
A
Abstract:
PURPOSE:To position a head with high accuracy by a simple and small-sized constitution, by varying one phase current of a pulse motor, and correcting an off-track of a magnetic head. CONSTITUTION:A position of a magnetic head 16 is determined by a moving base 15 whose movement is controlled by a pulse motor 13. A read signal of a magnetic disk by the head 16 in this first stop position is inputted to a host system 19 through a signal processing circuit 18. If an off-track error exists in the head 16, one of A phase or B phase correcting signal generating circuit 21a, 21b is selected through a system 19, a circuit 18 and a signal correcting controller 20, one phase current in two phases of the motor 13 is varied by a phase current variable circuit 22, and the head 16 is moved forward or backward by a fixed very small quantity through the motor 13. By this repetition, positioning can be executed with high accuracy so as to execute on-track of the head, by a simple and small-sized constitution without using a servo-loop.
More Like This:
| JPS6135199 | LOCK CURRENT SUPPLYING METHOD OF PULSE MOTOR |
| JPH06165592 | DRIVING METHOD FOR STEP MOTOR |
Inventors:
MORIMOTO ATSUTAKA
YANAGAWA YOSHIHIKO
YANAGAWA YOSHIHIKO
Application Number:
JP13896382A
Publication Date:
February 17, 1984
Filing Date:
August 10, 1982
Export Citation:
Assignee:
CITIZEN WATCH CO LTD
International Classes:
H02P8/00; G11B5/55; G11B5/58; G11B5/596; G11B21/10; (IPC1-7): G11B21/08; H02P8/00