| 摘要 |
PURPOSE:To utilize the hollow part of a motor as an optical path and to realize the small-sized structure of a device by arranging the hollow type motor, composed of an annular stator, a magnet rotor, and a bearing, concentrically with a lens barrel, and coupling a diaphragm mechanism with the rotor. CONSTITUTION:An annular stator 16 consists of yokes 17 and 18, and stator coils 19 and 19' equipped in the yokes, and then combined with an annular magne rotor 20 and a bearing device 21 which supports the stator and rotor, thus constituting a hollow magnet motor 10. A pin 11 is provided to the internal ring 24 of the bearing and driven according to the rotation of the rotor 20. Consequently, a diaphragm lever is driven to move diaphragm blades to prescribed positions, thus adjusting the quantity of light. |
