Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-09-19
1992-10-27
Levy, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, G11B 1110, G11B 1304
Patent
active
051595842
ABSTRACT:
A photo-magnetic (magneto-optic) recording device having recording medium in the form of a rotating magnetic disc having magnetic characteristics in a direction perpendicular to its surface has a pickup head (7) disposed on one side of the disc and movable radially of the disc to scan selected areas of the disc. On the side of the disc opposite to that on which the pickup head is located, there are provided a plurality of coils (8) generating a bias-magnetic field applied to the disc. The coils are disposed in overlapping arrangement with their centers disposed on a line extending radially of the disc. The coils are energized by electric circuitry which comprises means for sensing the position of the pickup head and energizing a respective coil located in position to apply a bias-magnetic to the area of the disc scanned by the pickup head.
REFERENCES:
patent: 4610009 (1986-09-01), Connell
patent: 4612587 (1986-09-01), Kaneko et al.
patent: 4748606 (1988-05-01), Naito et al.
patent: 4750159 (1988-07-01), Yoda
patent: 4862437 (1989-08-01), Okada
Motoyama Kazuyasu
Yanagida Tsuneo
Burns Robert E.
Levy Stuart S.
Lobato Emmanuel J.
Olympus Optical Company Limited
Rhoa Joseph A.
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