Magneto-optical means for reading disks by comparing signals at

Details Magneto-optical means for reading disks by comparing signals at Magneto-optical means for reading disks by comparing signals at

1990-09-10

1992-04-14

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, 369124, 360114, G11B 712, G11B 1110, G11B 1112, G11B 1304

Patent

active

051053993

ABSTRACT:
Recording medium on which information is magneto-optically recorded is irradiated with a linearly polarized light beam. A light beam reflected from or passed through the recording medium is changed in phase by a wave plate. Through an analyzer the differently polarized components of the light beam from the wave plate are combined by aligning the polarizing directions of the light beam. The light intensities of the forward and backward parts of the moving direction of the recording medium in the far field of the light beam from the analyzer are detected by a photo detector. A difference between the detected signals of the forward and backward parts is generated to reproduce the information recorded on the recording medium. Furthermore, the light beam from the wave plate is splitted into two light beams linearly polarized in mutually orthogonal directions. Two light intensities of the two light beams for the forward and backward parts of the moving direction of the recording medium in the far field of the respective light beams are detected by two photo detectors. Two differences between the outputs from the two photo detectors are determined by two subtractors. A difference or sum between the two subtractors is determined and the information is reproduced on the basis of thus determined difference or sum.

REFERENCES:
patent: 4546463 (1985-10-01), Opheij et al.
patent: 4721368 (1988-01-01), Deguchi et al.
patent: 4837758 (1989-06-01), Motoyama et al.
patent: 4847824 (1989-07-01), Davie
patent: 4939710 (1990-07-01), Fuji et al.

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