PURPOSE: To reduce a driving mechanism part in thickness, and to reduce the installation space and weight by providing a spring which energizes an aperture blade to open and a coil which is fixed to part of the top and reverse surface of said aperture blade.
CONSTITUTION: The coil 12 is fixed to part of the top and reverse surface of a holding plate 5, and both terminals of the winding of this coil 12 are connected electrically to aperture dowels 8a and 8b. A projection part 6b, on the other hand, is formed on the holding plate 6, and aperture blades 10 and 11 are energized and opened all the time with the spring 14 extended between said projection part 6b and a spring hook 13 arranged at a fixation part 7a. Thus, the thickness of the driving mechanism part is reduced and the installation space and weight are both reduced.
HAMA YOSHIHIRO
ENOMOTO SHIGEO
