Control system for the magnetic head of a magneto-optical disc a

Details Control system for the magnetic head of a magneto-optical disc a Control system for the magnetic head of a magneto-optical disc a

1991-11-26

1993-01-12

LaRoche, Eugene R.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369215, 360 59, 360114, G11B 1100, G11B 1720

Patent

active

051795442

ABSTRACT:
A device for inscribing and/or reading a magneto-optical disc (7), comprising a frame carrying a turntable which is rotatable about an axis of rotation (11), an optical unit (19) which comprises an objective (21) and an actuator for moving the objective in a direction parallel to such axis of rotation, and, viewed along such axis, a magnetic unit (59) arranged opposite to and spaced from the optical unit. The optical unit and the magnetic unit are movable in a plane which is oriented transversely of said axis of rotation. The magnetic unit comprises a coil (131) arranged on a coil former (129) and a further actuator (24) for moving the coil in a direction parallel to the axis of rotation of the turntable. The device further comprises a measurement and control system for detecting, during operation of the device, the distance between a reference plane (R) of the magnetic unit and the magneto-optical disc and for controlling the position of the coil.

REFERENCES:
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patent: 4750152 (1988-06-01), Yonekubo et al.
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patent: 4803674 (1989-02-01), Nakao et al.
patent: 4829508 (1989-05-01), Arita
patent: 4850695 (1989-06-01), Mikuriya et al.
patent: 4868802 (1989-09-01), Kobori
patent: 4879703 (1989-11-01), Kaku et al.

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