PROBLEM TO BE SOLVED: To provide an endoscope apparatus that can stably supply an observation window with a surface acoustic wave for removing contamination adhering to the observation window without deteriorating conversion efficiency (deflection) into the surface acoustic wave.SOLUTION: The endoscope apparatus 1 includes: the observation window 32 provided at an insertion end 11 of an endoscope 2 for the observation window 32 to face an imaging optical system 34 an oscillator 37 arranged on an inner surface of the observation window 32 and a deflector 40 for deflecting an ultrasonic vibration f from the oscillator 37 into the surface acoustic wave &Phi transmitting on an outer surface of the observation window 32 so that a groove filler 61 having a material different from the observation window 32 is filled in a plurality of grooves 40a formed in an outer surface of the observation window 32 facing the oscillator 37.COPYRIGHT: (C)2012,JPO&INPIT【課題】 観察窓に付着する汚れを落とすための表面弾性波への変換(偏向)効率が低下することなく、観察窓へ表面弾性波を安定供給することができる内視鏡装置の提供。【解決手段】 内視鏡2の挿入部11先端に撮像用光学系34に対向して設けられた観察窓32と、観察窓32の内表面に配設された振動子37と、振動子37に対向する観察窓32の外表面部分に形成された複数の溝部40aに観察窓32とは異なる材質の溝部充填材61を充填形成してなる、振動子37からの超音波振動fを観察窓32の外表面を伝播する表面弾性波Φに偏向する偏向部40と、を具備する内視鏡装置1。【選択図】図8
