| 摘要 |
A photo-sensor capable of accurate removal of photo-current due to background light when sensing the photo-current due to light projection and having frequency band of photo-current sensing system independent of photo-diode current is disclosed. A transistor having the source connected to the photo-electric converting element for passing photo-current generated in the photo-electric converter. An inverting amplifier includes the input side connected to the juncture between the photo-electric converting element and the transistor for amplifying the output signal from the photo-electric converting element. A signal storing circuit is provided between the source and the gate of the transistor for storing a signal corresponding to the photo-current. A switching element is provided between the output side of the inverting amplifier and the gate of the transistor.
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