PROBLEM TO BE SOLVED: To cool the inside of a tip while suppressing the increase of the diameter of an insertion part.SOLUTION: An imaging part 19 with a CCD and the like are arranged in the tip 11a of the insertion part 11. One end is opened in the internal space 48 of the tip and a cool air sending conduit 29 where the other end is connected to an air sending pump 42 through an operation part 12, a universal cord 13, a connector body 17 or the like is inserted into the insertion part 11. A clearance passage 64 formed of a clearance between the inner circumference and the outer circumference of the cool air sending conduit 29 or the like is arranged in the insertion part 11. One end of the clearance passage 64 is made to communicate with a tip internal space 48 and the other end is made to communicate with the ventilation connector 38 of the connector body 17, so that air from the air sending pump 42 is exhausted from the ventilation connector 38 through the cool air sending conduit 29, the clearance passage 64 or the like. A multi-core cable connected to the imaging part 19 is made to be inserted into the cool air sending conduit 29 to suppress the increase of the diameter of the insertion part 11.COPYRIGHT: (C)2012,JPO&INPIT【課題】挿入部の太径化を抑えつつ、その先端部の内部を冷却する。【解決手段】挿入部11の挿入部先端部11a内に、CCDを備える撮像部19などを設ける。一端が先端部内部空間48内で開口し、他端が操作部12、ユニバーサルコード13、コネクタ本体17等を経て送気ポンプ42に接続された冷却風送気管路29を挿入部11に挿通する。挿入部11内に、その内周と冷却風送気管路29等の外周との間の隙間により形成される隙間通路64を設ける。隙間通路64の一端を先端部内部空間48に連通させるとともに、他端をコネクタ本体17の通気コネクタ38に連通させることにより、送気ポンプ42からの空気を冷却風送気管路29、隙間通路64などを介して通気コネクタ38から排気させる。撮像部19に接続する多芯ケーブルを冷却風送気管路29内に挿通させて、挿入部11の太径化を抑制する。【選択図】図6
