Patent ID: 6897990

Claim:
A rocking member apparatus comprising torsion springs, a rocking member axially supported by the torsion spring, and a supporting substrate, the rocking member being rockable about the torsion spring, the apparatus further comprising: a hard magnetic member provided on one surface of the rocking member; a coil; and a soft magnetic member, the coil and the soft magnetic member being arranged so as to be spaced apart from the rocking member magnetized in a direction parallel to the one surface, and the coil and the soft magnetic member being arranged at different positions in a direction perpendicular to the one surface, wherein the hard magnetic member and the one surface are arranged at a position which is the same position as the soft magnetic member in a direction perpendicular to the soft magnetic member, or a position which is on the same side of the soft magnetic member as the coil in a direction perpendicular to the soft magnetic member.