Patent ID: 8605266

Claim:
A component measurement apparatus, comprising: a confocal optical system that includes a laser that emits laser light, a collimating lens that shapes the laser light emitted from the laser into collimated light, an objective lens that condenses the collimated light having exited the collimating lens in order to illuminate internal tissue of an object of measurement, 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, and 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 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 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 detection signal of the second light-receiving element, wherein the objective lens is a varifocal lens having a focal position that is adjustable in an optical axis direction.