To reduce a power loss by forming a device by a photo-electric transfer functional part comprising a photo-electric transfer element and a control functional part comprising a switching element and a control circuit.
A photoelectric transfer functional part 101 is constituted by a photoelectron 1010, a control functional part 102 is constituted by a switching element 1023 and a control circuit 1022. In the case of a current J flowing in a power fed part 2 from a power supply part 1, a signal level from the control circuit 1022 is low. At this low time, a switching element 1021 is turned on, a continuity condition is generated. Reverse to this case, that is, in the case of the current J flowing from the power fed part 2 in the power supply part 1, a signal from the control circuit 1022 is high. At this high time, the switching element 1021 is turned off, non-continuity condition or high impedance condition is generated. A high/low signal level can be suitably set. In continuity impedance of the switching element 1021, by changing this signal level, a voltage drop in the switching element 1021 can be reduced.
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TAKAHARA MASASHI
ITO KAZUYUKI
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