Patent ID: 7924127

Claim:
An actuator using electromagnetic force, the actuator comprising: a casing that forms two paths having a certain length in longitudinal direction, and forms a middle wall by the two paths; a main magnetic field generation element that is allocated on both faces of the middle wall of the two paths of the casing; and a moving element having a coil which is wound in the orthogonal direction to longitudinal direction of the paths and is in a body that its left and right sides passes through the paths and its front and back side are exposed to outside, the moving element moving upward along the longitudinal direction of the paths when forward direction current is provided in a coil, and the moving element moving downward along the longitudinal direction of the paths when backward direction current is provided in the coil; and an outer subsidiary magnetic field generation element and an inner subsidiary magnetic field generation element disposed at an upper end or a lower end of the main magnetic field generation element, a position of the moving element being maintainable by magnetic forces of the outer subsidiary magnetic field generation element and the inner subsidiary magnetic field generation element even though supply of current for the coil is cut off.