| 摘要 |
A first ranging apparatus includes a synchronizing signal generator for generating a synchronizing signal at a constant interval, a light-emitting unit for emitting an intensity-modulated light in response to the synchronizing signal input thereto, a light-detecting unit for detecting a reflected light from an object irradiated with the modulated light, in response to the synchronizing signal input thereto, a calculating unit for calculating the distance up to the object based on the phase difference between the modulated light and the reflected light, and a synchronizing signal control unit for changing an arrival time of the synchronizing signal from the synchronizing signal generator at the light-detecting unit, depending on the number of times that the synchronizing signal is generated. The light-detecting unit samples the amount of the reflected light in exposure periods established at a constant cycle length with reference to a time at which the synchronizing signal is input thereto.
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