| 摘要 |
PCT No. PCT/JP96/00190 Sec. 371 Date Nov. 4, 1996 Sec. 102(e) Date Nov. 4, 1996 PCT Filed Jan. 31, 1996 PCT Pub. No. WO96/24131 PCT Pub. Date Aug. 8, 1996An output current from the anode side of one photo-diode PD1 of two photo-diodes PD1, PD2 and an output current from the cathode side of the other photo-diode PD2 which serves as an in-phase signal with respect to the first mentioned output current are added in terms of current to convert an added current thus obtained into a voltage signal by a current/voltage converter 1. Thus, circuit such as summing amplifier, etc. can be omitted and this light signal detection circuit is only required to have one circuit/voltage converter 1. As a result, noise at the time of reproduction of a magneto-optical signal can be reduced while holding the circuit scale down to small size. Thus, S/N ratio of the reproduction signal is improved, thus, making it possible to improve, e.g., the error rate in the digital system to much degree. Accordingly, improvements, in reliability /information desity/transmission rate(speed) can be made.
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