| 摘要 |
PURPOSE:To obtain an easy-to-assemble electromagnetic diaphragm in an electromagnetic mechanism for driving of a diaphragm device by turning a coil around an axis perpendicular to an optical axis and transmitting the turning thereof to a diaphragm ring. CONSTITUTION:A shaft 2b extending in a radial direction is formed to a diaphragm ring 2 which drives a diaphragm vane 1 to open or close, and is brought into abutment on the pin 11a of an L-shaped member 11 mounted to a turning shaft 8a provided to a movable coil 8. A magnetic field generated by a permanent magnet 7 and a yoke 6 is applied to the coil to generate the turning force around the shaft 8a. Said turning is transmitted as the turning of the ring 2 by the member 11 by which the diaphragm is driven. The movement of the coil per se is small and the diaphragm is easy to assemble. |
