| 摘要 |
According to an embodiment, a light-projecting apparatus including a light-projector emitting an infrared light beam, a light-projector drive portion pulse-driving the light-projector; and a receiver; and a light-receiving apparatus including a light-receiver receiving the infrared light beam emitted by the light-projector, a light interruption judgment portion judging that the infrared light beam is interrupted when at least a predetermined number of pulses are successively not output by the light-receiver, a light-receiving state detection portion detecting a light-receiving state of the infrared light beam, and a transmitter transmitting the light-receiving state information to the receiver are provided. The period of the pulse driving signal in the light-projector drive portion is changed based on the information received by the receiver.
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