Method and apparatus for setting light quantity most suitable fo

Details Method and apparatus for setting light quantity most suitable fo Method and apparatus for setting light quantity most suitable fo

1989-08-21

1990-06-26

Stephan, Steven L.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369116, 360114, G11B 7125, G11B 1304

Patent

active

049377990

ABSTRACT:
An optomagnetic (magneto-optic) information reproducing or readout method including illuminating an optomagnetic (magneto-optic) recording medium with a linearly polarized light flux whose quantity is variable, detecting the value of the illumination flux from the recording medium through an analyzer, determining a threshold quantity of light at which the ratio between the detected value and the quantity of illumination light starts to deviate from a predetermined value, and scanning the recording medium with the linearly polarized light flux whose quantity is smaller than the threshold quantity of light, thereby reproducing or reading out the information stored on the recording medium. A device adapted to carry out the above-described method is also described.

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patent: 4633338 (1986-12-01), Sato et al.
patent: 4712203 (1987-12-01), Saito et al.

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