| 摘要 |
A rangefinder apparatus includes an infrared emitting diode (IRED) for projecting a luminous flux toward an object at a distance to be measured; a light detector for detecting reflected light of the luminous flux projected to the object, at a light-detecting position on a position sensitive detector corresponding to the distance to the object, and outputting a signal corresponding to the light-detecting position; an arithmetic unit for carrying out an arithmetic operation according to the signal output from the light detector, and outputting a distance signal corresponding to the distance to the object; an integrating capacitor, for carrying out a first integration by discharging or charging according to the signal output from the arithmetic unit, carrying out a second integration of a constant current, and comparing the resulting voltage to a reference voltage and outputting a comparison result signal, detecting the distance to the object according to the integrated signal; and a control for causing the IRED to start projecting light after a lapse of a time from after output of the comparison result signal.
|
