| 摘要 |
PROBLEM TO BE SOLVED: To suppress increase in size of a signal processing circuit related to optical noise.SOLUTION: A laser rader device includes: a plurality of light receiving elements D1-D7 for receiving reflected light of a laser beam; a distance measuring circuit 40 for obtaining electrical signals indicating voltage values corresponding to light receiving amounts from the light receiving elements through contacts, to measure a distance to a reflection point; a noise detection circuit 50 including a single current measuring circuit 55 common to the light receiving elements in a state in which a selection composite circuit 51 is disposed between itself and a main circuit 30; the selection composite circuit connected to lines linked to the light receiving elements, for obtaining the electrical signals indicating output currents from the light receiving elements, and controlled by a control unit 60 to input a combined signal obtained by selectively partially combining the electrical signals to the current measuring circuit. The device measures a sum of the light receiving amounts of a plurality of different groups of the light receiving elements in a form of a current value by switching selection patterns of the signals in the selection composite circuit to specify the light receiving element having a large light noise amount on the basis of the measurement result. |
