Patent ID: 8879069

Claim:
An optical image measurement device, comprising: a light source that generates a laser beam; a light amount adjustment part that adjusts light amount of the laser beam generated by said light source; a scanning part that scans said laser beam on a measured object by changing irradiation position of said laser beam on said measured object by changing the direction of a galvanomirror; a detection part that detects said laser beam reflected by said measured object; an image formation part that forms an image of said measured object based on the detection result obtained by said detection part; a light amount measuring part that is placed outside light path of said laser beam irradiated on said measured object and is capable of measuring the light amount; and a mode switching part that alternatively switches between two modes: an image formation mode for forming an image of said measured object and a light amount measurement mode for measuring the light amount of said laser beam; characterized in that: when the mode is switched to said light amount measurement mode by said mode switching part, said scanning part changes the direction of said galvanomirror so that said laser beam is irradiated toward the light amount measuring part placed outside the light path; said light amount measuring part measures the light amount of said input laser beam; and said light amount adjustment part previously stores a specified light amount range, and adjusts the light amount of the laser beam generated by said light source such that the light amount measured by the said light amount measuring part falls within said specified range.