1993-05-21
1995-02-21
Blankenship, Howard B.
G03B 940
Patent
active
053920856
ABSTRACT:
A focal-plane shutter apparatus is arranged such that, from a state that an image plane is substantially doubly covered with a first vane group and a second vane group and with release of camera, the second vane group withdraws outside the image plane and thereafter the first vane group starts running for exposure, and comprises a balancer member moving in the opposite direction to the withdrawal direction of the second vane group in synchronism with the withdrawal of the second vane group outside the image plane, and a start adjusting member for substantially simultaneously starting the withdrawal of the second vane group outside the image plane member and the movement of the balancer member, thereby enabling full use of performance of the balancer for reducing camera shake during the withdrawal of second vane group.
REFERENCES:
patent: 4458998 (1984-07-01), Tanaka et al.
patent: 4657366 (1987-04-01), Tanabe et al.
patent: 4668065 (1987-05-01), Tanaka et al.
Blankenship Howard B.
Nikon Corporation
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