1979-01-16
1981-11-03
Gellner, Michael L.
354 60F, 354149, G03B 7093, G03B 1505
Patent
active
042982561
ABSTRACT:
An automatic exposure control device for a camera capable of permitting flash photography includes an exposure computing portion for natural light photography wherein the computing portion generates an exposure signal corresponding to the brightness of an object and an exposure computing portion for flash photography wherein the computing portion is arranged to generate an exposure signal suitable for a flash photographing operation. An exposure control portion is responsive to one of the exposure signals generated by the natural light photographing exposure computing portion and the flash photographing exposure computing portion. A change-over device applies one of the exposure signals to the exposure control portion. An electromagnetic release device actuates the internal mechanism of the camera wherein the release device produces an electrical signal when it operates. A signal generating device generates a selection signal until the electrical signal is applied from the electromagnetic release device and generates an inhibition signal after application of the electrical signal. A discharge tube emits a flash therefrom an an accumulating portion accumulates light emitting energy for the discharge tube. A detecting device detects the accumulation of the light emitting energy and is arranged to produce a detection signal when the accumulated amount of energy reaches a predetermined value. A triggering device enables the discharge tube to emit a flash in response to the detection signal. The automatic exposure control device performs other functions relative to exposure control.
REFERENCES:
patent: 4047194 (1977-09-01), Nakamura et al.
Kawamura Masaharu
Shigeta Yoshihiro
Sugiura Yoji
Uchidoi Masanori
Yamamoto Hiroshi
Canon Kabushiki Kaisha
Gellner Michael L.
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