| 摘要 |
A signal detection circuit comprises: a driving power source that drives a photosensor and applies a voltage to a mechanical switch, wherein the photosensor has a light-emitting device, and a light-receiving device to output an electric signal corresponding to an amount of light received from this light-emitting device, and the mechanical switch is connected in parallel between a power supply terminal of the photosensor and a signal output terminal of the photosensor and switchable between on and off states; and a detection means that is connected to the signal output terminal of the photosensor and that detects an electric signal output by the photosensor and an electric signal indicating the on/off state of the mechanical switch.
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