Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-06-12
1992-11-10
Nguyen, Hoa
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, G11B 1114, G11B 1304
Patent
active
051630320
ABSTRACT:
The invention relates to a magneto-optical recorder with magnetic-field modulation. It comprises a laser (8) for producing a light beam (6), an optical focussing system (9) for forming a focal spot (12), and a servo device (10) for maintaining the focal spot (12) in focus on the surface of a thermo-magnetic record carrier (4), and for supplying a correction signal (V.sub.c) which is representative of the position of the surface of said carrier. A current modulator modulates the current through a coil (15) of a magnetic head. A compensation device (7) is responsive to said correction signal (V.sub.c) to change a parameter influencing the field of the coil, in such a way that the field strength at the surface of said carrier (4) is substantially independant of the position of said surface.
REFERENCES:
patent: 4357696 (1982-05-01), Bierhoff
patent: 4550346 (1985-10-01), Hatano
patent: 4670865 (1987-06-01), Hatano
patent: 4706232 (1987-11-01), Funada et al.
Philips Technical Review, vol. 42, No. 2, Aug. 1985, pp. 37-47.
Bakx Johannes L.
Janse Jan J.
van Nieuwland Jacob M.
Botjer William L.
Nguyen Hoa
U.S. Philips Corp.
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