Distance measuring devce and laser beam projector therefor

摘要

A laser beam projector has a laser light source that outputs a laser beam, a light projecting mirror for reflecting the laser beam outputted from the laser light source, a mirror driving device for oscillating the light projecting mirror so as to scan a specified area with the laser beam and piezoelectric elements attached to a back surface of the light projecting mirror. As a voltage is applied to the piezoelectric elements, the curvature of the reflecting surface of the light projecting mirror can be changed and the visibility angle of the light beam projector can be varied. A distance measuring device is formed with such a laser beam projector together with a laser beam receiver for receiving reflected waves of the laser beam from an object and a control unit for measuring the distance to the object based on the difference between the time of projecting the laser beam and the time of receiving the reflected waves by the laser beam receiver as well as the direction of the object from the direction of the projected laser beam.