Patent attributes
The present invention provides a rangefinder that has a light source for outputting a measuring beam, an AM modulation unit that modulates the measuring beam with a modulation signal, a light receiving unit that detects a reflected beam that is part of the modulated measuring beam and reflected by a measurement object, a phase difference detection unit that finds a phase difference between the measuring beam and the reflected beam, a distance arithmetic unit that calculates a distance to the measurement object based on the detected phase difference, a burst drive unit for pulse-driving the light source to operate in burst emission, and a wave position detection unit that detects a wave position based on a delay time, wherein the distance arithmetic unit calculates the distance to the measurement object based on the detected wave position and the detected phase difference.
