Patent ID: 7476846

Claim:
An MEMS mirror device comprising: a light projecting part that generates laser light; a first light receiving part that converts received light into a signal; an optical system that uses an MEMS mirror and serves to form said laser light generated by said light projecting part into a beam, to project said beam in a specified search direction, to receive reflected light from said search direction and to lead said received light to said first light receiving part, said MEMS mirror having: a semiconductor substrate having a surface that is mirror-finished by a semiconductor process and has areas arranged in a matrix form; a plurality of semiconductor elements each formed by a semiconductor process as a mirror element with a mirror surface in different one of said areas; and at least one photodiode each at different one of said areas on said surface; a second light receiving part including said at least one photodiode formed on said MEMS mirror and having a photosensitive range for reflected light with higher brightness than the photosensitive range of said first light receiving part; and a synthesizing part that outputs a synthesized signal formed by synthesizing outputs from said first light receiving part and said second light receiving part.