PROBLEM TO BE SOLVED: To provide an endoscope light source device and an endoscope system that stabilize emission of light of a light source even when voltage applied to the light source increases temporarily in emitting illumination light for imaging a biomedical tissue.SOLUTION: An endoscope light source device comprises: a detection unit that when a voltage spike is generated in voltage applied to a light source during emission of illumination light, detects whether or not power to be supplied to the light source satisfies a condition of reaching a first power allowable upper limit value previously set depending on the light source； and a control body unit for controlling current to be supplied to the light source. When the detection unit detects satisfaction of the condition, the control body unit performs changeover from control of supplying fixed current or fixed power to the light source to control of supplying the current to the light source after fixing a value of the current to a second value for keeping the emission of illumination light within a range of power not exceeding a second power allowable upper limit value larger than the first power allowable upper limit value.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】生体組織を撮像するための照明光を射出する際、一時的に光源にかかる電圧が上昇しても、光源の光の射出を安定化させる内視鏡用光源装置及び内視鏡システムを提供する。【解決手段】内視鏡用光源装置は、照明光の射出中光源にかかる電圧に電圧スパイクが発生して、前記光源に供給する電力が、前記光源に応じて予め設定された第１電力許容上限値に達する条件を満たすか否か、を検出する検出部と、前記光源に供給する電流を制御する制御本体部と、を備える。前記制御本体部は、前記検出部が、前記条件を満たすことを検出した場合、一定の電流あるいは一定の電力を前記光源に供給する制御から、前記第１電力許容上限値に比べて大きい第２電力許容上限値を超えない範囲で、前記電流を前記照明光の射出を維持する第２の値に固定して前記電流を前記光源に供給する制御に切り替える。【選択図】 図１
