PROBLEM TO BE SOLVED: To provide an endoscope in which both of washing an observation window and washing an observation object are performed only with the use of one water delivery channel.SOLUTION: The observation window 62 for taking in image light from an observation object, an air delivery nozzle 66 for spraying gas to the observation window 62, and a water delivery nozzle 67 for spraying a liquid to the observation object are arranged at the distal end 20 of an endoscope insertion tube. The water delivery nozzle 67 is roughly linearly disposed between the observation window 62 and the air delivery nozzle 66. When a washing liquid is sprayed from the water delivery nozzle 67, the washing liquid is sprayed onto the observation object to wash the observation object. When the air from the air delivery nozzle 66 and the washing liquid from the water delivery nozzle 67 are simultaneously sprayed, the trajectory of the washing liquid is bent toward the observation window 62 by the air and the washing liquid is sprayed onto the observation window 62 to wash the observation window 62. Thus, only one water delivery channel to be connected to the water delivery nozzle 67 enables the observation window 62 and the observation object to be washed.COPYRIGHT: (C)2013,JPO&INPIT【課題】1本の送水管路のみで観察窓の洗浄と観察対象の洗浄とを行うことができる内視鏡を提供する。【解決手段】内視鏡挿入部の先端部20には、観察対象からの像光を取り込む観察窓62と、観察窓62に向けて気体を噴射する送気ノズル66と、観察対象に向けて液体を噴射する送水ノズル67とが設けられている。送水ノズル67は、観察窓62と送気ノズル66との間に略一直線状に並べて配置されている。送水ノズル67から洗浄液を噴射させると、洗浄液が観察対象に吹き付けられて観察対象が洗浄される。送気ノズル66からの空気と送水ノズル67からの洗浄液とを同時に噴射させると、空気によって洗浄液の軌道が観察窓62側に曲げられ、洗浄液が観察窓62に吹き付けられて観察窓62が洗浄される。従って、送水ノズル67に接続される1本の送水管路のみで観察窓62と観察対象との洗浄が可能になる。【選択図】図5
