Patent
1978-06-20
1980-08-12
Griffin, Donald A.
354237, 354267, G03B 908, G03B 964, G03B 1738
Patent
active
042170516
ABSTRACT:
A camera shutter has a control member movable when the shutter is released for successively actuating an opening member and a closing member to effect the taking of an exposure. A delay mechanism coacts with the control member to effect the selective setting of a range of exposure times including a minimum exposure time by which the control member actuates the opening and closing members without interaction of the delay mechanism, a next to the minimum exposure time by which the control member engages with the delay mechanism prior to actuating the opening and closing members, and one or more longer exposure times by which the control member actuates the opening member and then engages with the delay mechanism prior to actuating the closing member. The engagement of the control member and delay mechanism prior to actuation of the opening and closing members, in the next to the minimum exposure time mode, compensates for unstable motion of the control member at the initial stage of movement thereof under control of the delay mechanism thereby ensuring exposure accuracy.
REFERENCES:
patent: 3657982 (1972-04-01), Uno et al.
patent: 3721166 (1973-03-01), Yanagi et al.
patent: 3825940 (1974-07-01), Hayami
patent: 3893143 (1975-07-01), Taguchi et al.
patent: 3945026 (1976-03-01), Hayami
patent: 3984848 (1976-10-01), Akiyama et al.
patent: 4069491 (1978-01-01), Scholz
Nakagawa Tadashi
Nemoto Ichiro
Adams Bruce L.
Burns Robert E.
Griffin Donald A.
Lobato Emmanuel J.
Seiko Koki Kabushiki Kaisha
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