| 摘要 |
PURPOSE:To attain stable servo drive by suppressing an encoder error due to a play of a bearing section in a lens moving frame of the direct drive system. CONSTITUTION:A slit plate 50 is arranged at a position on an extension line of 1st bearing sections 10a, 10b in an axial direction (1). Or the slit plate 50 is arranged between the two 1st bearing sections 10a, 10b (2). The relation of Ex<Ey in the case of Lx>Ly or Ex>Ey in the case of Lx<Ly is in existence, where Ly is a distance between a plane G including two guide shafts 20a, 20b and a gravity center W of a moving part comprising a lens moving frame 32, a lens 30, a drive coil 7 and the slit plate 50, Lx is a distance between a point being a projection of the gravity center on the plane G and a thrust gravity center Fg of an actuator, Ey is the distance between the slit 51 and the plane G and Ex is the distance between the guide shaft 20a and a point being a projection of the slit 51 onto the plane G. |
