Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1987-10-13
1989-03-14
Faber, Alan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, 350407, 369110, G11B 1114, G11B 5127, G11B 1304
Patent
active
048130320
ABSTRACT:
In a magneto-optical information reproducing apparatus, the angle .theta.A formed between the optic axis of an analyzer for analyzing reflected or transmitted light from a recording medium and a predetermined direction corresponding to a light polarization direction satisfies the following conditions: ##EQU1## where the average of the intensities of polarized components entering a photodetector for detecting light from the analyzer and not modulated by the magneto-optical effect is Ir, the square mean of the intensity fluctuation in a magneto-optical signal observation frequency is .DELTA.I.sub.r.sup.2, .xi.=.DELTA.I.sub.r.sup.2 /Ir.sup.2, the quantity of light of the incident light beam on the recording medium is I.sub.O, the amplitude reflectance of the recording medium is R, the light utilization efficiency of an optical system from the recording medium to the photodetector except the analyzer is .epsilon., the photoelectric conversion efficiency of the photodetector is k, the amount of charge is e, the thermal noise of an amplifier for amplifying the signal detected by the photodector in the magneto-optical signal observation frequency is T, the band width of the detection signal is .DELTA.B, the amplitude transmittance of the analyzer is tA, and the extinction ratio of the analyzer is .eta.A. Also, in case that the apparatus includes a beam splitter therein, the condition of the angle .theta.A is decided.
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patent: 4561032 (1985-12-01), Matsumoto
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patent: 4672593 (1987-06-01), Ojima et al.
patent: 4712203 (1987-12-01), Saito et al.
patent: 4721368 (1988-01-01), Deguchi et al.
Canon Kabushiki Kaisha
Faber Alan
Nguyen Hoa T.
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