| 摘要 |
PURPOSE:To execute a preview, by providing a capacitor which is charged by turning on a main switch interlocked with an automatic diaphragm lever of a camera, and discharged through an electromagnet by turning off said switch. CONSTITUTION:In the inside of a lens mount part 2 of a camera body, an automatic diaphragm lever 12 is provided, the lever 12 is fastened to a mount part of a bellows and is positioned under a switch (S) 14, and the S 14 is closed in a normal state. On a lens installing side mount part 6 of the bellows, a diaphragm interlocking member 15 is provided freely slidably up and down by a guide member, and is supported by a lock lever 17. In case of executing a preview operation, when an S27 is turned off, electric charged which has charged to a capacitor 30 is discharged through an electromagnet 20, the lever 17 is turned, a side branch 15 of the member 15 is saved in the moving direction by a habit of a preview lever 13, and a aperture blades of a lens are stopped down to a prearranged aperture value. In case of releasing the preview, when the S27 is turned on, a motor 23 is driven through an AND circuit 31 from S26 and S14 being in an on-state, and the preview is released. |
