PROBLEM TO BE SOLVED: To provide an endoscope light source optical system capable of handling respective observation methods, preventing enlargement of a light source device and securing brightness.SOLUTION: A light source optical system guiding light from a light source 1 to a light guide 6 includes a lighting control means 13 having an optical image surface and a pupil surface arranged outside a conjugate surface for them for carrying out light control by eclipsing a flux and color subtracting lens 2a for suppressing coloring of the flux on a plane with a light control means 13 arranged on the plane. In this case, the color subtracting lens 2a, a condenser lens 2b and a positive lens group are arranged in this order from a light source side.COPYRIGHT: (C)2013,JPO&INPIT【課題】各観察方法に対応可能であり、光源装置の大型化を防ぎ、かつ、明るさを確保できる内視鏡光源光学系を提供する。【解決手段】光源1からの光をライトガイド6に導く光源光学系において、光学的な像面や瞳面又はそれらの共役面以外に配設され、光束をけることによって調光を行う調光手段13と、調光手段13が配設された面上の光束の色付きを抑えるための色取りレンズ2aとを有し、光源側から順に、色取りレンズ2a、集光レンズ2b、正レンズ群とを配置する。【選択図】図13
