Magneto-optical recording and reproducing device having integral

Details Magneto-optical recording and reproducing device having integral Magneto-optical recording and reproducing device having integral

1991-06-11

1993-04-13

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 360 66, G11B 1304, G11B 1114

Patent

active

052028623

ABSTRACT:
A magneto-optical recording/reproducing device which records information by irradiating a light beam of constant intensity on a magneto-optical recording medium while simultaneously applying a magnetic field thereon through a recording magnetic head; and which reproduces the recorded information through a reproducing magnetic head. The magneto-optical recording medium has a magnetic film formed on a translucent substrate and the magnetic field applied through the recording magnetic head reverses in response to the information to be recorded. The recording magnetic head and the reproducing magnetic head are integrally provided on a single magnetic core in order to set their positions easily with respect to each other. By making a magnetic core end-face of the reproducing magnetic head smaller than a light beam spot, information recorded on areas smaller than the light beam spot can be reproduced. A large reproduced output may be achieved by using a magneto-optical recording medium which has a soft magnetic material layer made of soft magnetic material provided between the substrate and the magnetic film.

REFERENCES:
Nomura, T., "Comparison of Readout Characteristics Between Magnetooptic Transfer Heads and Magnetic Heads", IEEE Transactions of Magnetics 25(6) p. 4474 (1989).
Takabashi, M., "Extremely High Density Magneto-Optical Recording by Using Magnetic Field Modulation Method", Digests of the 13th Annual Conference on Magnetics in Japan, 23aC-10, p. 198, (Nov. 22-25, 1989).

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