Transient motion of shutter blade model with a gap support

Abstract

The uneven-exposure is rarely occurring at the msanufacturing stage in the focal-plain-shutter for SLR camera. The possible cause of unevenness-exposure is shutter-blades vibration. The cause of vibration is the gap between the shutter blades and pins. This study focuses on the backlash of arm with drive-unit. Simplify shutter-blades model is used on transient motion experiment. The motion of the blade is measured by laser displacement meter and high speed camera. As the result, it became clear that the blade collides with pins and vibrates. The amount of vibration was decided by maximum displacement of the blade tip. The maximum displacement is calculated theoretically. The theoretical value corresponded reasonably well with measurement value. The maximum displacement became small when the distance between hole center and pin center on horizontal axis becomes large.