Patent ID: 8547535

Claim:
A component measurement apparatus comprising: a laser that emits non-collimated laser light; an objective lens that condenses the non-collimated laser light emitted from the laser in order for the laser light to illuminate internal tissue of an object of measurement without shaping the laser light into collimated light; a half mirror that redirects reflected light reflected by the internal tissue of the object of measurement and refracted by the objective lens; a pin hole through which the reflected light redirected by the half mirror passes; a first light-receiving element that receives the reflected light having passed through the pin hole; a data analyzer section that measures a component of the object of measurement in accordance with data output from the first light-receiving element; an optical fiber used to illuminate a surface of the object of measurement with the output light of the laser; a second light-receiving element that detects reflected light reflected by the surface of the object of measurement due to the illumination using the optical fiber; and a laser driver circuit that drives the laser so as to maintain an output light intensity of the laser at a certain value in accordance with a detection signal of the second light-receiving element.