| 摘要 |
PURPOSE:To manufacture the device at a low price and strengthen a torque by arranging a motor driving device in an arcuate shape and incorporating said device in a lens tube. CONSTITUTION:A motor driving device is furnished with a non-magnetic material motor unit substrate 1 provided within a lens mirror tube, a first fixed magnetic pole member 2 having a stator 2a, a first magnetic core member 4 having a first stator winding 3 and a stator 4a and a rotor 6 together with its shaft 7a of a permanent magnet, and further composed of a second fixed magnetic pole member 10 having a stator 10a, a second magnetic core member 12 having a second stator winding 11 and a stator 12a and others. Also, the shaft 7a and the like are provided with gears 9, 13, 17 which engage with each other so that a rotation of the rotor 6 is transmitted to a gear 18 and to a focusing portion. Then, each of angles between stators 4a and 12a, 12a and 2a, 2a and 10a, and 10a and 4a is set to approximately 90 deg. and these stators are arranged in an arcuate shape while respective stator windings 3, 11 are controlled in conduction alternately. |
