Position control system for information storage system

Details Position control system for information storage system Position control system for information storage system

1987-10-13

1992-01-28

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, 369 4428, 369 4425, 360 9801, G05B 1940

Patent

active

050846612

ABSTRACT:
A position control system for an information storage system, for example, an optical disc system, includes a stepping motor for moving a read-write head and a DC motor for moving a beam reflecting unit, such as an object lens mounted on the head. The position control system drives the stepping motor to compensate a positional error of the beam reflecting unit in a tracking mode after a seek without disturbing the movement of the beam reflecting unit. The position control system includes a master control unit operatively connected to a host controller, a stepping motor control unit, and a track servo control unit. The master control unit activates the stepping motor control unit for a seek operation upon receipt of a seek command from the host controller. The stepping motor control unit drives the stepping motor with a large drive current until the head moved by the stepping motor reaches a position adjacent to a target track on the recording medium. In a tracking operation, the track servo control unit drives the DC motor in response to a positional error of the head at the target track to finely control a position of the head at the target track. The stepping motor control unit drives the stepping motor by a predetermined rotation angle with a small drive circuit to compensate a position of the access end when the position of the beam reflecting unit exceeds a limit of a controllable range of the beam reflecting unit.

REFERENCES:
patent: 4642544 (1987-02-01), Furumura et al.
patent: 4750163 (1988-06-01), Yamamiya et al.
patent: 4800546 (1989-01-01), Shikichi et al.
patent: 4807206 (1989-02-01), Moriya et al.
patent: 4812932 (1989-03-01), Hishinuma et al.
Patent Abstracts of Japan, vol. 6, No. 108 (P-123) (986), Jun. 18, 1982 and JP-A-57 37743 (TEAC K.K.).

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