Patent ID: 9671678
Date: 2017-06-06
CPC Classifications: G02B,G03B

Claim:
1. A focal-plane shutter comprising: a substrate plate having an opening and extensive in a deployment direction; an arm rotatably supported on the substrate around a rotation axis; a set of blades arranged in an overlapping manner in an optical axis direction perpendicular to the deployment direction and each extensive in a longitudinal direction perpendicular to both the optical direction and deployment direction, wherein each of the blades is rotatably attached to the arm at hinges so that the set of blades is collectively driven by rotation of the arm to retract in a retraction direction opposite to the deployment direction to retracted positions where the set of blades increases their overlapping areas among them to open the opening and to deploy in the deployment direction to deployed positions where the set of blades reduces their overlapping areas among them to close the opening, and wherein the set of blades includes a leading blade having a leading longitudinal edge and being deployed in the deployment direction ahead of a rest of the blades in the set; and a cushioning member made of an elastically deformable material and secured on the substrate plate, the cushioning member comprising: