Patent ID: 6726381
Filing Date: 2004-04-27
Classification: G03B

Abstract:
A focal-plane shutter for a camera, comprising:two base plates, each having an aperture for exposure at about a middle thereof, said two base plates being arranged on an object side and on an imaging surface side, respectively, to form a single blade chamber therebetween or to form two blade chambers into which a space between said two base plates is partitioned by an intermediate plate having an aperture for exposure at about a middle thereof, wherein a shutter blade group placed in each of said two blade chambers comprises a plurality of arms whose pivotal ends are pivotally mounted to one of said two base plates at a side of said aperture and at least one blade pivotally supported by said arms through individual joint shanks and is arranged so that working paths of said joint shanks fail to run inside the apertures of said two base plates, and wherein at least one of said two base plates is provided with a wall projected toward a blade chamber side, said wall being located between the joint shanks that are arranged on distal ends of said arms opposite to said pivotal ends thereof and an edge of said aperture, to extend along said edge of said aperture, and having an inclined face directed toward said aperture of an opposite base plate.