Patent ID: 8118503

Claim:
A blade driving device for cameras, comprising: a base plate which has an opening for a photographing optical path to construct a blade chamber between a cover plate and the base plate, and in which (i) a blade-chamber-side surface between one end in a longitudinal direction of the base plate and the opening is a first region, (ii) the blade-chamber-side surface between a remaining end in the longitudinal direction and the opening is a second region, and (iii) a surface on either side of the opening in a direction perpendicular to the longitudinal direction between the first region and the second region is a third region; driving means including a driving pin providing a reciprocating operation in the blade chamber, the driving means being mounted to a surface on an opposite side of the first region with respect to the base plate; a first blade rotatably mounted in the first region so as to be introduced into, and removed from, the opening by the reciprocating operation of the driving pin, such that, when the first blade is removed from the opening, a part of the first blade introduced into the opening exists in the first region; and a second blade slidably mounted in the first region so as to be introduced into, and removed from, the opening simultaneously with the first blade by the reciprocating operation of the driving pin, such that, when the second blade is introduced into the opening, the opening is completely closed by the first blade and the second blade, and such that, when the second blade is removed from the opening, a part of the second blade introduced into the opening exists in the third region.