Differential detection assembly for data retrieval from a data s

Details Differential detection assembly for data retrieval from a data s Differential detection assembly for data retrieval from a data s

1993-06-02

1995-03-21

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 4423, 369110, 369112, 360114, G11B 1100

Patent

active

054003067

ABSTRACT:
An optical assembly for detecting a light beam returning from an optical storage media and generating a signal representative of the information stored on the storage media wherein the optical assembly includes a first photodetector that is positioned in the path of the returning light beam at a predetermined angle, so that p polarized light contained in the light beam will be absorbed by the first photodetector and s polarized light will be reflected and redirected toward a second photodetector, which is positioned in the path of the redirected s polarized light and perpendicular to the path of the s polarized light, such that substantially all of the s polarized light is absorbed by the second photodetector and the photocurrents produced by the two photodetectors are differenced to produce a signal representative of the information stored on the storage disk.

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Mansuripur M., et al., "Signal and Noise in Magneto-Optical Readout," J. Appl. Phys. 53(6) (Jun. 1982), pp. 4485-4494.
Freese, Robert P., "Optical Disks Become Eraseable," IEEE Spectrum, Feb. 1988 pp. 41-45.

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