An apparatus for controlling the rotation and stabilizing the po

Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam

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360114, 360 66, 369 14, G11B 1112, G11B 1304

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active

051114402

ABSTRACT:
A control circuit for use in a magneto-optic data recording system is disclosed. The control circuitry includes proportional-integral-derivative (PID) circuitry for controlling the rotation position of a permanent magnet. Acceleration circuity is used in controlling the rotational movement of the permanent magnet. The outputs from the PID circuitry and the acceleration circuitry are selectively applied to drive circuity using a switch. The drive circuity supplies current to actuators for moving or controlling the position of the permanent magnet.

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patent: 4972337 (1990-11-01), Eguchi et al.
patent: 4979158 (1990-12-01), Yoda
Ohta et al., "Magneto-optical disk with reflecting layers", Proceedings SPIE vol. 382, Jan. 17-20, pp. 252-259.
Imamura, "Research Applies Magnetic Thin Films and the Magnetooptical Effect in Storage Devices", IEE, Mar. '83, pp. 100-103.
Gyorgy, "Optical Properties of Metals" (MnAlCee Filus for Magneto-optic applications, Journal of Applied Physics, vol. 42, No. 4, Mar. 15, 1971, pp. 1704 and 1705.
Kryder, "Magneto-optic recording technology (invited)", J. Appl. Phys., vol. 57, No. 1, Apr. 15, 1985, pp. 3914-3918.

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