Magnetic biasing apparatus for magneto-optic recording including

Details Magnetic biasing apparatus for magneto-optic recording including Magnetic biasing apparatus for magneto-optic recording including

1986-03-28

1987-10-20

Cardillo, Raymond F.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 59, 365122, G11B 503, G11B 1304, G11B 1114

Patent

active

047018950

ABSTRACT:
A magneto-optic disc recording system includes a cylindrical permanent magnet for providing magnetic biasing selectively for the recording and erasing processes. The magnet is positioned radially with respect to the disc rotation, on the opposite side of the disc from, but aligned with, the path of radial motion of the focused recording/erasing light beam. The poles of the magnet are diametrically opposed, and the magnet is axially rotatable. Circular eddy currents, induced by the magnetic field of the magnet on the surface of the rotating disc, generate a second magnetic field which opposes the field of the magnet, thus impelling rotation of the magnet. A stopping mechanism stops the rotation of the magnet with one or the other of its poles adjacent the disc, such that either a recording or erasing magnetic bias is selectively provided to the recording region.

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