Thin bias magnet unit for magneto-optical recording device

Details Thin bias magnet unit for magneto-optical recording device Thin bias magnet unit for magneto-optical recording device

1996-07-11

1998-07-07

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 772, 369 752, 360114, G11B 1100

Patent

active

057779520

ABSTRACT:
A bias magnet unit has a permanent magnet that applies a bias magnetic field to an optical spot on a magneto-optical disk. A driving coil rotates the magnet in order to change a polarity of the bias magnetic field. A sensor detects the intensity and polarity of the bias magnetic field to confirm the rotational position of the magnet after it has been rotated. A linkage structure that is connected between a magnet holder of the magnet unit and the housing has arms that drive the magnet unit between two positions, one in which the magneto-optical disk cartridge can be inserted into the device and another in which the disk is loaded onto the spindle motor for recording/playback. Overall, the components of the device cooperate structurally to provide a relatively thin device structure having low power consumption.

REFERENCES:
patent: 5202861 (1993-04-01), Yoshida
patent: 5345431 (1994-09-01), Olivar et al.
patent: 5537370 (1996-07-01), Shigematsu et al.
patent: 5587973 (1996-12-01), Kanazawa et al.

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