PROBLEM TO BE SOLVED: To provide an endoscope apparatus which can easily and reliably detect optical transmission loss caused by disconnection of optical fiber or the like.SOLUTION: The endoscope apparatus is structured as follows: a plurality of illumination windows for emitting illumination light, and an observation window for observing an object are set up to the tip of an endoscope-inserting part to be inserted into the object. The endoscope apparatus includes: a light sauce a light-guiding member the light emitting end of which is set up toward the illumination windows and which functions as a light pass through which output light from the light sauce is transmitted to the illumination windows through the endoscope-inserting part and an illumination light-controlling means for controlling the lighting of the light sauce by switching between a normal lighting pattern for making endoscopic observation, and a loss-confirming lighting pattern for confirming the optical transmission loss of the light-guiding member and different in control from the normal lighting pattern so as to control the lighting of the light sauce.COPYRIGHT: (C)2012,JPO&INPIT【課題】光ファイバの断線等に生じる光伝送損失を簡単かつ確実に検出することができる内視鏡装置を提供する。【解決手段】内視鏡装置は、被検体内に挿入される内視鏡挿入部の先端に、照明光を出射する複数の照明窓と、被検体を観察する観察窓とが配置されている。この内視鏡装置は、光源と、光出射端が照明窓に向けて配置され、光源からの出力光を内視鏡挿入部を通じて照明窓まで伝送する光路となる導光部材と、内視鏡観察を行うための通常点灯パターンと、導光部材の光伝送損失を確認するための通常点灯制御とは異なる損失確認用点灯パターンとに切り替えて光源を点灯制御する照明光制御手段と、を備える。【選択図】図1
