1978-01-27
1979-03-27
Gellner, Michael L.
354 43, 354271, 354272, G03B 708, G03B 902
Patent
active
041463170
ABSTRACT:
An exposure control apparatus operating with selection of the diaphragm preselection and shutter preselection automatic exposure control modes is provided with first and second signal shapers arranged to cooperate with a lens aperture mechanism through a common intermediate member. Upon setting of a desired diaphragm value in the lens aperture mechanism, the intermediate member is driven along with the first signal shaper in exactly corresponding relation. In the shutter preselection automatic diaphragm control mode, while the first signal shaper is cut off from connection with an exposure value computer, the second signal shaper is driven for scanning operation to produce ever-varying outputs which are compared with the output of the computer upon coincidence to stop movement of the lens aperture mechanism, thereby the scanning result is translated to the proper diaphragm presetting, as the intermediate member is arranged to delay the start of movement of the lens aperture mechanism from the start of the scanning operation by a time interval determined by taking into account the signal response characteristics of the automatic diaphragm adjusting mechanism.
REFERENCES:
patent: 3973266 (1976-08-01), Kakunodate et al.
patent: 4052727 (1977-10-01), Ito et al.
Date Nobuaki
Ito Fumio
Ito Tadashi
Mashimo Yukio
Sunouchi Akio
Canon Kabushiki Kaisha
Gellner Michael L.
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