Signal recording and reproducing apparatus for an opto-magnetic

Details Signal recording and reproducing apparatus for an opto-magnetic Signal recording and reproducing apparatus for an opto-magnetic

1986-03-26

1988-03-22

Cardillo, Raymond F.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 8, 360 57, 360 59, 360114, 365122, G11B 1112

Patent

active

047333855

ABSTRACT:
A signal recording and reproducing device for use with an opto-magnetic disk having a number of concentric recording tracks. An optical head sweeps a given track at least twice during a time interval equal to a predetermined reproduction time for the track. Erasure signals and recording signals are supplied to the optical head during the first time sweeping and the second time sweeping, respectively, in order to effect signal erasure and recording. At the time of switching from the first time sweeping to the second time sweeping, the address data indicating the end point written on the terminal portion of the previously recorded signal area are sensed, and the recording is effected from the thus sensed recording end point.

REFERENCES:
patent: 3789137 (1978-07-01), Newell
patent: 4138694 (1979-02-01), Doi et al.
patent: 4357638 (1982-11-01), Yoshimaru et al.
patent: 4495530 (1985-01-01), Yanagida
patent: 4539662 (1985-09-01), Hatano et al.
patent: 4639920 (1987-01-01), Kaneko

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