Optical pick-up for selective playback and recording on a magnet

Details Optical pick-up for selective playback and recording on a magnet Optical pick-up for selective playback and recording on a magnet

1988-09-28

1991-05-07

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369116, 369121, 369122, G11B 1304, G11B 1110, G11B 1112

Patent

active

050142534

ABSTRACT:
An optical pick-up for selective playback and recording on a magneto-optically recording medium, in which light is projected from a source onto the medium. The light is provided with a direction of a polarization, and is either reflected from the recording medium or is transmitted through the medium. The reflected or transmitted light becomes deflected onto a predetermined one of several photodetectors, depending on the direction of polarization of the light. The intensity of the reflected light or the transmitted light is held constant to minimize noise components that result from the optical properties of different recorded media as well as from the light. By holding the light intensity constant, moreover, precise readjustment to each of the different recording media that may be used, is not necessary.

REFERENCES:
patent: 4283785 (1981-08-01), Miyauchi et al.
patent: 4410277 (1983-10-01), Yamamoto et al.
patent: 4779250 (1988-10-01), Kogure et al.

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