Patent ID: 6554502
Filing Date: 2003-04-29
Classification: G03B,H04N

Abstract:
A light quantity control apparatus, comprising:a first base plate having an optical axis opening, at least one drive means mounted on the first base plate, a shutter blade mounted on said first base plate and engaging the at least one drive means, an intermediate plate disposed above the shutter blade, a diaphragm blade disposed above the intermediate plate, a second base plate disposed above the diaphragm blade, and a protruding guide formed on said first base plate to support the shutter blade thereon and having a closing region where the shutter blade completely closes the opening, an opening region where the shutter blade opens the opening, and an inclined surface formed at at least one of the closing region and the opening region, said inclined surface gradually narrowing a gap with respect to said intermediate plate at an end of the region thereof so that a speed of movement of the shutter blade is reduced by the inclined surface to prevent rebounding thereof.