FOCAL-PLANE SHUTTER AND OPTICAL APPARATUS

摘要

A focal-plane shutter capable of suppressing production of foreign matter is provided. The focal-plane shutter includes a base plate, rear curtain drive arms, a blade that is driven by the rear curtain drive arms, and an elastically deformable cushioning member that comes into contact with the blade that moves from a retracted position to an unfolded position. The blade extends in a first direction. The rear curtain drive arms are swingable around the centers of swing motion provided on one side of the blade in the first direction. The cushioning member has a contact section that comes into contact with a side edge of the blade, a holding section that is arranged on the side opposite the blade with the contact section therebetween, and a connecting section that connects the contact section and the holding section to each other. The connecting section inclines with respect to a second direction perpendicular to the first direction and extends toward the centers of swing motion.

主权项

1. A focal-plane shutter comprising:
a substrate that has an opening; an arm that is so supported by the substrate as to be swingable; a blade that is driven by the arm and moves between a retracted position where the blade retracts from the opening and an unfolded position where the blade so unfolds as to overlap with at least part of the opening; and a cushioning member that comes into contact with the blade that moves from the retracted position to the unfolded position, the cushioning member being elastically deformable, wherein the blade extends along a first direction that intersects a direction in which the blade moves from the retracted position to the unfolded position, the arm is swingable around a center of swing motion provided on one side of the blade in the first direction, the cushioning member includes:
a contact section that comes into contact with a side edge that is an edge of the blade and located on a downstream side in the movement direction of the blade;a holding section that is arranged on a side opposite the blade with the contact section therebetween, set apart from the contact section, and held by the substrate; anda connecting section that connects the contact section and the holding section to each other, and the connecting section inclines with respect to a second direction perpendicular to the first direction and extends toward the center of swing motion.