PROBLEM TO BE SOLVED: To provide a light source device that prevents wavelength conversion efficiency from being reduced by a temperature rise of a fluorescent substance while implementing downsizing of the device and reduction in a cost.SOLUTION: A light source device comprises: a rotor that is rotated around a rotation shaft and has a front surface and a rear surface； a control unit that controls a drive unit for performing rotation drive on the rotation shaft in order to rotate the rotor around the shaft； a first front surface side wavelength conversion unit that is provided on the circumference of a circle taking the rotation shaft as the circle's center on the front surface of the rotor, and receives light from a radiation unit for performing light radiation to generate light having a wavelength differing from that of the received light； and a rear surface side wavelength conversion unit that is provided on the circumference of a circle taking the rotation shaft as the circle's center on the rear surface of the rotor, the circle differing from that of the first front surface side wavelength conversion unit, and receives light from the radiation unit to generate light having a wavelength differing from that of the received light.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2017,JPO&INPIT【課題】装置の小型化及び原価低減を実現しつつ、蛍光体の温度上昇による波長の変換効率の低下を防止する光源装置を提供する。【解決手段】光源装置は、回転軸を中心に回転され、表面及び裏面を有する回転体と、前記回転体を軸回りに回転させるために前記回転軸を回転駆動する駆動部を制御する制御部と、前記回転体の表面における前記回転軸を中心とする円の周上に設けられ、光を照射する照射部からの光を受けて該光とは異なる波長の光を発生する第１の表面側波長変換部と、前記回転体の裏面における前記回転軸を中心とする前記第１の表面側波長変換部とは異なる円の周上に設けられ、前記照射部からの光を受けて該光とは異なる波長の光を発生する裏面側波長変換部と、を具備する。【選択図】図７
