PROBLEM TO BE SOLVED: To keep a light intensity difference between illumination lights low with a simple configuration and prevent overexposure and underexposure.SOLUTION: A light source device for endoscope comprises: a white light source that emits a white light flux including first and second wavelength regions and a rotary filter that alternately draws a first illumination light and a second illumination light from the white light flux. The rotary filter comprises: a rotating plate that has first and second filter regions arranged in a circumferential direction and a rotation driving part that rotates the rotating plate so that the first illumination light and the second illumination light switch in accordance with imaging timing. The light source device draws the first and second illumination lights from the white light flux and then emits them in the first and second filter regions. A circumferential size of the second filter region is set so that amplitude of an imaging signal to be output from an imaging element when imaging a subject illuminated by the first illumination light becomes approximately equal to that of an imaging signal to be output from the imaging element when imaging the subject illuminated by the second illumination light.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2016,JPO&INPIT【課題】簡単な構成により、照明光間の光量差を低く抑え、白とびや黒つぶれを防止する。【解決手段】内視鏡用光源装置は、第1及び第2の波長域を含む白色光束を出射する白色光源と、白色光束から、第1の照明光と第2の照明光とを交互に取り出す回転フィルタとを備え、回転フィルタが、円周方向に配列された第1及び第2のフィルタ領域を有する回転板と、撮像のタイミングに合わせて第1の照明光と第2の照明光とが切り替わるように回転板を回転させる回転駆動部とを備え、第1、第2のフィルタ領域において、第1、第2の照明光を白色光束から取り出して出射し、第1の照明光で照明された被写体を撮像した時に撮像素子から出力される撮像信号の振幅と、第2の照明光で照明された該被写体を撮像した時に該撮像素子から出力される撮像信号の振幅とが略等しくなるように、第2のフィルタ領域の円周方向の大きさが設定されている。【選択図】図2
