Patent ID: 9612000
Date: 2017-04-04
CPC Classifications: A61B,F21V,G01N,G02F

Claim:
1. A light source device, comprising: one light emission unit from which light is emitted; a plurality of light source units that output outgoing light with mutually differing wavelengths; a photo coupler that connects the light emission unit and plurality of light source units; and a controller that controls the plurality of light source units, wherein each of the plurality of light source units includes: a light emitting element; a wavelength conversion unit, including a phase matching element, that converts a wavelength of light output from the light emitting element, thus generating the outgoing light; and a detection unit that detects an intensity of reflected light generated by light emitted from the light emission unit being reflected by a measurement target, wherein the controller gradually increases the output of each light emitting element, and stops the increase of the output of each light emitting element when the intensity of the reflected light detected by the detection unit reaches a threshold value or above; wherein the threshold value is based on a degree of oxygen saturation in blood; and wherein the controller is configured to modulate respective drive currents to modulate respective intensities of simultaneously outgoing light of at least two light emitting elements, and to measure a signal corresponding to the outgoing light intensities at a light receiving side of the detection unit using a fundamental wave drive current as a reference signal.