Thin bias magnet unit for magneto-optical recording device
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United States of America Patent
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-
Jul 7, 1998
Grant Date -
N/A
app pub date -
Jul 11, 1996
filing date -
Jul 12, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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