| 摘要 |
PROBLEM TO BE SOLVED: To provide a galvano-mirror having good driving characteristics in which the center of the torque acting on the moving part can be set in the vicinity of the center of gravity of the moving part or in the vicinity of the center of the movable supporting part when the mirror is driven so as to be tilted. SOLUTION: Driving characteristics are improved by fixing a mirror 6 on the front recessed part of a mirror holder 18 of the shape of a rectangular frame which constitutes the moving part, mounting a first coil 21 and a second coil 22 on the longitudinal direction of the outer peripheral surface of this mirror holder 18 so that the position of the center of gravity G of the moving part is interposed in the forward and backward direction, supporting the mirror holder freely turnably around a rotation axis 9 and another rotation axis orthogonal to the former axis with a spring 23 so that the axes pass the center of gravity G, fixing a magnet 31 to a magnet holder 14 which serves as the fixed side at both right and left sides of the first coil 21 and further fixing a magnet 33 on both sides of the vertical direction of the second coil 22, and supplying driving currents to the first coil 21 and the second coil 22 to set the central positions D1-1 and D2-2 of torques which act on the first coil 21 and the second coil 22, respectively, in the vicinity of the supporting point formed by the center of gravity G and the spring 23. |
