Patent ID: 8031386
Filing Date: 2011-10-04
Classification: G02B,H02P

Abstract:
1. A galvano motor configured to scan or deflect light from a light source, the galvano motor comprising: a rotating shaft; a rotating drive unit configured to rotationally drive the rotating shaft; and a rotating angle detector which is joined to one end of the rotating shaft, wherein the rotating shaft is configured so that a deflection member which is heavier than the rotating angle detector at the other end opposite to the one end to which the rotating angle detector is joined, wherein when the deflection member is joined to the rotating shaft, a phase crossover frequency fphase in open-loop characteristics of the galvano motor, a torsion resonance frequency fscale between a center part of the rotating shaft and the rotating angle detector, and a torsion resonance frequency fmirror between the center part of the rotating shaft and the deflection member satisfy the relation of fphase<fscale≦fmirror, and wherein phases at the torsion resonance frequencies fscale and fmirror are other than −180 degrees.