System for recording and playing back information with magneto-o

Details System for recording and playing back information with magneto-o System for recording and playing back information with magneto-o

1982-08-05

1985-10-22

Richardson, Robert L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369121, 369 13, 360114, G11B 700

Patent

active

045492875

ABSTRACT:
Disclosed is a system for recording and playing back information utilizing a magneto-optical disc memory having a vertical magnetization film on and from which the information is recorded and read out by an optical means. In order to simplify the construction of the system, an optical system including an objective lens and a tracking mirror is used both as a part of an optical path of a recording light beam and a part of an optical path of a readout light beam. The wavelengths of the recording light beam and the readout light beam are selected to be different so that the light beams are easily discriminated in the optical system.

REFERENCES:
patent: 3715740 (1973-02-01), Schmit
patent: 3731290 (1973-05-01), Aagard
patent: 3969576 (1976-07-01), Boonstra et al.
patent: 4085423 (1978-04-01), Tsunoda et al.
patent: 4275275 (1981-06-01), Bricot et al.
patent: 4290122 (1981-09-01), Bates et al.
patent: 4403318 (1983-09-01), Nagashima et al.
Imamura et al, Japanese Journal of Applied Physics, vol. 19, No. 12, 12/80, pp. L731-L734.

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