PROBLEM TO BE SOLVED: To provide a magnifying endoscope which makes small a configuration of a tip of a flexible pipe and which enables a lens to be held in a desired stationary position.SOLUTION: A magnifying endoscope includes a flexible pipe of an insertion part, which has a coil 52 concentrically provided at a tip thereof. The tip of the flexible pipe comprises a lens 48 which is displaced along the axis of the coil 52 to perform a zooming operation. The tip of the flexible pipe also comprises a magnet 38 which displaces the inside of the coil by interlocking with the lens 48. An operation portion of the magnifying endoscope counts a pulse generated in the coil 52 by displacement of the lens 48. The magnifying endoscope also includes a motor 44 which serves as a driving source of the lens 48, and a driving force transmission member 42 which transmits a driving force of the motor 44 to the lens 48. When the motor 44 remains stationary, the magnifying endoscope detects that the lens 48 is displaced from a stationary position, by the lens 48 being shifted from the stationary position due to a restoring force of the driving force transmission member 42 and by the pulse being counted.COPYRIGHT: (C)2013,JPO&INPIT【課題】可撓管先端部の構成が小さく、かつ、レンズを所望の静止位置に保持することが可能な拡大内視鏡を提供する。【解決手段】拡大内視鏡は、先端部にコイル52が同心的に設けられた挿入部可撓管を備える。可撓管の先端部は、コイル52の軸心に沿って変位し、ズーミング動作するレンズ48を備える。可撓管の先端部は、レンズ48に連動してコイルの内側を変位する磁石38を備える。拡大内視鏡の操作部は、レンズ48が変位することによりコイル52に発生するパルスをカウントする。拡大内視鏡は、レンズ48の駆動源であるモータ44と、モータ44の駆動力をレンズ48に伝達する駆動力伝達部材42とを備える。拡大内視鏡は、モータ44が静止しているとき、駆動力伝達部材42の復元力によってレンズ48が静止位置から移動されて、パルスがカウントされることによって、レンズ48が静止させている位置からずれたことを検出する。【選択図】図3
