Focal plane shutter

Details Focal plane shutter Focal plane shutter

1991-06-28

1992-12-15

Wintercorn, Richard A.

G03B 940

Patent

active

051721520

ABSTRACT:
A focal plane shutter includes a reversing lever mounted on a shaft disposed on a driving lever for opening and closing a blade group constituting the focal plane shutter so that a relative rotation range of the reversing lever with respect to the driving lever is restricted. Energizing means for energizing the driving lever toward the end of forward movement is directly engaged with the reversing lever. Further, a cam follower is disposed on the reversing lever between the shaft mounting the reversing lever and the engagement point of the reversing lever with the energizing means. Energizing force acting on the reversing lever is transmitted to the driving lever through the reversing lever to move the driving lever toward the end of forward movement. Motion of the cam follower is restrained by a cam profile while the driving lever is moved toward the end of forward movement, so that the energizing force acting on the reversing lever is reversed at the cam follower serving as a fulcrum and is transmitted to the driving lever as braking force. Accordingly, shock and oscillation at the end of forward movement are reduced.

REFERENCES:
patent: 4975722 (1990-12-01), Suzuki et al.

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