Focal plane shutter

Details Focal plane shutter Focal plane shutter

1987-09-15

1988-04-19

Mathews, A. A.

354251, 354252, G03B 940

Patent

active

047393556

ABSTRACT:
In order to enable to obtain stable exposure time even for successive photographing at high speeds and completely synchronize flashing without errors, the focal plane shutter comprising a front blade group and a rear blade group is adapted in such a manner that the rear blade group is returned to its start position (folded position) substantially at the final stage of the shutter cocking travel, a retaining lever for locking the rear balde group at the unfolded position (position covering the exposure aperture) during the shutter cocking operation functions as a brake member for the rear blade operating lever, and said focal plane shutter is equipped with a movable X-contact lever which is retained at a position apart from a fixed contact by a front blade actuating arm during and after the shutter cocking operation and maintained at a position apart from the fixed contact by an X-contact release lever operated by the rear blade operating lever for the time from completion of the exposure operation to completion of the former half of the shutter cocking travel.

REFERENCES:
patent: 3825940 (1974-07-01), Hayami
patent: 4109266 (1978-08-01), Inoue
patent: 4245905 (1981-01-01), Takayama
patent: 4302091 (1981-11-01), Harase et al.

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