PROBLEM TO BE SOLVED: To provide an endoscope that can stably supply a surface elastic wave to an observation window without deteriorating conversion (deflection) efficiency, regarding the surface elastic wave for removing smudge adhering to the observation window.SOLUTION: The endoscope includes: the transparent observation window 32 provided at an insertion part end portion of the endoscope facing an imaging optical system an oscillator 37 arranged on an internal surface of the observation window 32 and a deflection section 40 that is provided in the observation window 32 facing the oscillator 37 and deflecting a propagation direction of an ultrasonic vibration f from the oscillator 37 to the surface elastic wave &Phi travelling on the outer surface of the observation window 32.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】内視鏡の挿入部先端に撮像用光学系に対向して設けられた透明な観察窓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に対向した観察窓32の内部に設けられ、振動子37からの超音波振動fの伝播方向を観察窓32の外表面を進行する表面弾性波Φに偏向する偏向部40と、を具備する内視鏡装置。【選択図】図8
