PROBLEM TO BE SOLVED: To provide an optical unit which can switch optical characteristics between three steps by a simple structure while achieving a reduction in a diameter of an insertion portion.SOLUTION: An optical unit 10 includes: a shaft body 14 which has a rod shape and is magnetized in an axially symmetric manner a blade member 12 which has a shaft body arrangement hole 12h2 for fixing the shaft body 14 and an optical member fixing hole 12h1 for integrally fixing a lens 10L an optical unit frame 11 which has an arrangement hole 18h where the blade member 12 is arranged and has a body side shaft body hole 18b and a diaphragm hole 18a which is an optical path on a bottom surface an electric magnet 17 comprising a first force action part 17d having a first action surface 17d1 and a second action surface 17d2, a second force action part 17e having a first action surface 17e1 and a second action surface 17e2, a coil core 17a having a bending part 17c, and a coil 17b and a coil spring 16 which is arranged on the shaft body 14 in the optical unit frame 11 for arranging the blade member 12 by energizing it to the bottom surface of the optical unit frame 11.COPYRIGHT: (C)2015,JPO&INPIT【課題】挿入部の小径化を図りつつ、単純な構成で光学特性を三段階に切り替え可能な光学ユニットを提供する。【解決手段】光学ユニット10は、棒形状で軸対称に着磁された軸体14と、軸体14を固定するための軸体配設孔12h2及びレンズ10Lを一体に固定するための光学部材固定孔12h1を備える羽根部材12と、羽根部材12が配設される配設穴18hを備え、底面に、本体側軸体用孔18b及び光路となる絞り孔18aを設けた光学ユニット枠11と、第1作用面17d1及び第2作用面17d2を備える第1の力の作用部17dと、第1作用面17e1及び第2作用面17e2を備える第2の力の作用部17eと、曲げ部17cを有するコイルコア17a及びコイル17bを備えて構成された電磁石17と、光学ユニット枠11内において軸体14に配置されて、羽根部材12を光学ユニット枠11の底面に付勢して配置させるコイルバネ16と、を具備する。【選択図】図4
