| 摘要 |
PURPOSE:To collect an electromagnetic driving source for driving to open and close it to one, and to make this shape small-sized by providing the first and the second movable coil parts for driving to open and close the first and the second shutter blades, on each of both side faces of one magnet. CONSTITUTION:In an initial state that an exposing opening 2 is covered light- tightly with the first shutter blade 3, and the second shutter blade 23 is positioned by overlapping each plate blade 24-28 on the upper position of the exposing opening 2, when a current is supplies between lead wires 67, 68, a magnetic field is generated by a coil 66, and by a magnetic force by this magnetic field, the first movable coil part 63 moves downward. Following it, the first driving piece 64 depressed a transfer shaft 20, a transfer member 17 is turned clockwise around a supporting shaft 11, and a driving arm 9 is turned clockwise around the supporting shaft 11 by a transfer shaft 19. Following it, a driven arm 12 is also turned clockwise centering around a supporting shaft 14, each plate blade 4-8 moves downward in parallel, respectively, the exposing opening 2 is opened from the upper end of the plate blade 8 of the uppermost position, and what is called an exposure is started. |
