PROBLEM TO BE SOLVED: To maintain biological surface illuminance of white light and excitation light, and to set the ratio between an irradiation range of the excitation light and an irradiation range of the white light to a preset desired value.SOLUTION: This light source device includes: a first light source 52 emitting first light (e.g., the excitation light) incident on a light guide part LG guiding light to a part to be observed and irradiating the light onto the part to be observed and a second light source 50 emitting second light (e.g., the white light) incident on the light guide part LG. In the light source device, emission angles of the first light and the second light guided by the light guide part LG and irradiated onto the part to be observed are simultaneously changed by an emission angle change part 57.COPYRIGHT: (C)2013,JPO&INPIT【課題】白色光と励起光との生体面照度をともに維持するとともに、励起光の照射範囲と白色光の照射範囲との比率を予め設定された所望の値に設定する。【解決手段】被観察部まで光を導光して被観察部に上記光を照射する導光部LGに入射される第1の光(たとえば励起光)を射出する第1の光源52と、導光部LGに入射される第2の光(たとえば白色光)を射出する第2の光源50とを備えた光源装置において、導光部LGによって導光されて被観察部に照射される第1の光と第2の光との出射角を出射角変更部57によって同時に変更する。【選択図】図4
