Patent ID: 6835009
Filing Date: 2004-12-28
Classification: G03B

Abstract:
A shutter apparatus comprising:a shutter base plate having a shutter aperture; a first arm member which rotates around a center of rotation at a first axis, relative to said shutter base plate; a second arm member which rotates around a center of rotation at a second axis, relative to said shutter base plate; and a plurality of shutter blades, each of the plurality of shutter blades being coupled to said first and second arm members, whereby rotation of said first and second arm members around their respective axes causes said plurality of shutter blades to run over said shutter aperture, wherein each shutter blade has a blade main body portion extending in a direction perpendicular to a running direction thereof, wherein a first shutter blade with a smallest running travel comprises a light shielding portion projecting in the running direction on the coupling portion side to said first and second arm members and arranged to effect light shielding of said shutter aperture; and wherein the following condition is satisfied: L1>W1, where W1 is a length, in the running direction, of the blade main body portion of said first shutter blade, and L1 is a projection length of said light shielding portion from said blade main body portion.