PROBLEM TO BE SOLVED: To provide a light source device for an electronic endoscope which, when controlling an amount of light with a lighting control mechanism, controls the intensity distribution of illuminating light so as to reduce the intensity difference between a center part and a peripheral part, thereby realizing suitable observation with the electronic endoscope.SOLUTION: The light control mechanism comprises: a light-shielding part which shields parallel illumination light emitted by a light source and plural openings which allow the parallel illumination light to pass therethrough. The light-shielding part and openings of the light control mechanism are set to have such shapes where the dimming factor of the parallel illuminating light emitted by the light source decreases from the light axis center to the periphery of the parallel illuminating light.COPYRIGHT: (C)2016,JPO&INPIT【課題】調光機構による光量調整時に、照明光の強度分布を中心部と周辺部の強度差を小さく抑えるように調整することで、電子内視鏡による好適な観察を実現することができる電子内視鏡用光源装置を得る。【解決手段】調光機構は、光源が出射した平行照明光を遮る遮光部と、光源が出射した平行照明光を通過させる複数の開口部とを有している。調光機構の遮光部と複数の開口部は、光源が出射した平行照明光の減光率が平行照明光の光軸中心から周辺にかけて減少するような形状に設定されている。【選択図】図5
