OPTICAL DEVICE

PROBLEM TO BE SOLVED: To reduce background light noise received by a light reception unit, to receive fine return light from an object more accurately by the light reception unit, and to make a device compact. SOLUTION: An optical device 10 includes: a laser light source 12; a collimator lens 14; a MEMS mirror 16 having a scanning mirror 26 which turnably changes the reflection angle of laser light emitted from the collimator lens 14, and has reflecting surfaces 26A and 26B on both sides configured such that the reflecting surface 26A reflects the laser light emitted from the collimator lens 14 and the reflecting surface 26B reflects the return light from the object; a light beam direction converting mirror 18 that reflects the laser light reflected by the reflecting surface 26A a plurality of times and emits it toward the object so that the laser light reflected by the reflecting surface 26A is emitted toward the reflecting surface 26B; and an imaging lens 20 and a light receiving element 22 which receive the return light reflected by the reflecting surface 26B. COPYRIGHT: (C)2010,JPO&INPIT