Patent ID: 7431517
Filing Date: 2008-10-07
Classification: G03B

Abstract:
1. A focal plane shutter for cameras comprising: two base plates each having an exposure aperture and defining at least one blade chamber therebetween; at least one shutter blade comprising a plurality of arms and at least one blade rotatably supported by the arms; each of the plurality of arms is rotatably mounted their one end to one of the base plates, the plurality of arms and at least one shutter blade being arranged in the blade chamber; and at least one drive unit mounted to one of the base plates to cause the shutter blade move reciprocally, wherein the drive unit comprises: a motor having a rotor which can rotate reciprocally, a first drive member rotating reciprocally with the rotor, a second drive member having a drive pin which is connected to one of the arms in the blade chamber to cause the shutter blade move reciprocally, the second drive member being rotatably mounted to any one of the base plates; and a link member connecting its one end to the first drive member and the other end to the second drive member for transmitting reciprocal rotation of the first drive member to the second drive member, and wherein the second drive member is in a state of being capable of coming into direct contact with the first drive member in the vicinity of the stop position thereof, so that a force from the second drive member acts substantially in the direction of an axis of rotation of the first drive member.