LIGHT SOURCE DEVICE, PROJECTOR, AND LIGHTING UNIT

To provide a light source device that has a simple structure and comprises a mechanism that can adjust the light path length between a reflection member and a lens.SOLUTION: A light source device comprises: an excitation-light light source that generates excitation light; a reflection member that reflects the excitation light; a lens that is arranged on a light path of the excitation light reaching the reflection member from the excitation-light light source and deflects the excitation light; a housing that accommodates the reflection member in a sealed internal space; an operation member 560 that is exposed from the housing in a direction intersecting the light path and appears/disappears with respect to the housing by an operator's manual operation; and an adjustment mechanism 500 that adjusts the light path length between the reflection member and lens in conjunction with the operation member appearing/disappearing with respect to the housing.SELECTED DRAWING: Figure 6 【課題】シンプルな構造で、反射部材及びレンズの間の光路長を調整可能な機構を備えた光源装置を提供する。【解決手段】光源装置は、励起光を発生させる励起光光源と、励起光を反射する反射部材と、励起光光源から反射部材に至る励起光の光路に配置されて、励起光を屈折させるレンズと、密閉された内部空間に反射部材を収容するハウジングと、ハウジングから光路と交差する方向に露出しており、作業者の手動操作によってハウジングに対して出没する操作部材５６０と、ハウジングに対して出没する操作部材に連動して、反射部材及びレンズの間の光路長を調整する調整機構５００とを備えることを特徴とする。【選択図】図６