| 摘要 |
PURPOSE:To lessen the time lag to make a direct photometry possible even by a lens shutter, by connecting not mechanically but electrically a sector opening member and a sector closing member directly by an electromagnetic magnet and an armature. CONSTITUTION:In the set completion state, a sector opening ring 7 and the first and the second sector closing rings 105 and 205 are rotated clockwise, and an electromagnetic magnet 21 is pressed to an armature 20. When power is supplied to the electromagnetic magnet 21 by the release operation to turn a detaining lever 14 to the right, the sector opening ring 7 is turned counterclockwise together with the sector closing ring 105, and the closing ring 205 is turned in the same direction also, and a sector 1 starts opening. When the quantity of exposure to light reaches a required value, power supply to the electromagnetic magnet 21 is cut off, and sector closing rings 105 and 205 are turned clockwise and are returned, and the sector 1 is closed to return to the original state. |
