Patent ID: 8454248

Claim:
A focal plane shutter for cameras provided with one or two shutter blade units opening and closing an exposure aperture, one or two shutter blade unit-driving units which include driving pins connected to the shutter blade units respectively, which are rotatably fitted to a shutter base plate, and which rotate in a reciprocating manner to make the shutter blade units open and close the exposure aperture respectively, one or two driving springs one end part of each of which is connected with a spring-connection part of a shutter blade unit-driving unit, each of which is tensed by rotating the shutter blade unit-driving unit in one direction in the cocking operation, and each of which rotates the shutter blade unit-driving unit in the other direction through the elastic force of the driving spring in shooting, and a braking mechanism which is provided for the one shutter blade unit-driving unit or at least one of the two shutter blade unit-driving units and which brakes the rotation of the shutter blade unit-driving unit in the other direction at the stage just before the completion of the rotation, wherein the braking mechanism is provided with a brake member which has a first part to be pushed, a second part to be pushed, and a third part to be pushed, which is rotatably fitted to a fitting shaft erectly provided on the shutter base plate, which is in its initial position in which the first part is located in the trajectory of the operation of the driving pin in the cocked state, which is rotated from its initial position by the driving pin pushing the first part while force against the rotation of the brake member from its initial position is applied to the brake member by pushing the end part of the driving spring as a result of the contact between the second part and the one end part of the driving spring at the final stage of the rotation of the shutter blade unit-driving unit in the other direction, and which is released from the press of the first part due to the driving pin and from the press of the second part due to the end part of the driving spring in the cocking operation, and a friction-providing means which includes at least one plate spring, which is fitted to the fitting shaft, and by which friction resistant force is applied to the rotation of the brake member, and the brake member is adapted to be returned to its initial position through the third part by being pushed by the driving pin or a pushing part provided for the driving unit in the cocking operation.