ACTUATOR

To provide an actuator in which a magnet is not demagnetized and further a coil can be downsized.SOLUTION: An actuator 100 comprises: a movable core 102; a return spring 110 which energizes the movable core to an initial position; a first coil 116 which attracts and moves the movable core; one stationary core 120; a first adsorption part 132 and a second adsorption part 134 which are formed in the movable core and opposed with the stationary core at stable positions at both ends; a magnet 122 forming a magnetic route Ra passing through the first adsorption part or a magnetic route Re passing through the second adsorption part via the stationary core; and a second coil 118 forming a magnetic route Rc partially overlapped with the magnetic route passing through the first adsorption part or the second adsorption part. A current is caused to flow through the second coil, to switch the magnetic route by the magnet to a magnetic route Rb returning through the stationary core to the magnet without passing through the first adsorption part and the second adsorption part.SELECTED DRAWING: Figure 1 【課題】磁石が減磁されず、さらにコイルを小型化することができるアクチュエータを提供する。【解決手段】本発明にかかるアクチュエータ１００は、可動鉄心１０２と、可動鉄心を初期位置に付勢するリターンスプリング１１０と、可動鉄心を吸引して移動させる第１コイル１１６と、１つの固定鉄心１２０と、可動鉄心に形成され両端の安定位置において固定鉄心と対向する第１吸着部１３２および第２吸着部１３４と、固定鉄心を介して第１吸着部を通る磁路Ｒａまたは第２吸着部を通る磁路Ｒｅを形成する磁石１２２と、第１吸着部または第２吸着部を通る磁路と一部重複する磁路Ｒｃを形成する第２コイル１１８と、を備え、第２コイルに電流を流すことによって、磁石による磁路を、第１吸着部および第２吸着部を通らずに固定鉄心を通って磁石に戻る磁路Ｒｂに切り替えることを特徴とする。【選択図】図１