| 摘要 |
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: sin2 theta A DIFFERENCE +TR <IMAGE> FR = xi x ( kappa epsilon ¦tA¦2 ¦R¦2IO)2 x DELTA B S = 2e kappa epsilon ¦tA¦2 ¦R¦2IO x DELTA B 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 &upbar& Ir, the square mean of the intensity fluctuation in a magneto-optical signal observation frequency is DELTA Ir2, xi = DELTA Ir2/Ir2, the quantity of light of the incident light beam on the recording medium is IO, 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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