Patent ID: 7015778

Claim:
An actuator device comprising: a rotation body having a rotation axis, a rotation axis holding member which rotatably supports the rotation axis of said rotation body by bearing said rotation axis on a recess formed on its top face, a rotation restriction plate for restricting the rotation position of said rotation body, posture holding means for allowing a self-holding in a first posture in which one end of said rotation body is in abutment against one end of said rotation restriction plate, or in a second posture in which the other end of said rotation body is in abutment against the other end of said rotation restriction plate, and driving means for moving said rotation body from said first posture to said second posture, or from said second posture to said first posture, wherein said rotation restriction plate is provided on the side opposite said rotation axis holding member with respect to the rotation axis of said rotation body so that when one end or the other end of said rotation body is caused to abut against the one end or the other end of said rotation restriction plate, the rotation axis of the rotation body applies a force to the rotation holding member when an end of the rotation body is in contact with the restriction plate, wherein said posture holding means comprises a permanent magnet constituting part of the rotation body, and a first yoke and a second yoke extending from the vicinity of one end of the permanent magnet to the vicinity of the other end of said permanent magnet, and wherein when said rotation body is in said first posture or second posture, said rotation body is held in said first posture or second posture by forming a closed magnetic circuit between said permanent magnet and said first or second yoke.