Patent
1981-11-09
1984-05-22
Adams, Russell E.
3541271, 354476, G03B 716
Patent
active
044498039
ABSTRACT:
An annunciating apparatus for use with an electronic flash system includes a flash system which employs a trigger device generating a trigger signal at a time of test light emission and a light producing device responsive to the trigger signal for initiating operation of the light producing device to produce light. The annunciating apparatus includes a light sensitive device arranged to receive light passed through a photographic taking lens and produces a first electrical signal corresponding to an amount of light from a scene. The annunciating apparatus also includes a signal generating device for producing a second electrical signal corresponding to an aperture value preset on a camera at the time of test light emission for the electronic flash system and a comparison device for receiving the first and second signals to produce a control signal when the first electrical signal reaches a predetermined level. Finally, an annunciator responsive to the control signal annunciates whether a correct exposure obtains.
REFERENCES:
patent: 4193677 (1980-03-01), Hasegawa et al.
patent: 4230402 (1980-10-01), Uchiyama et al.
patent: 4351600 (1982-09-01), Hasegawa et al.
Hiramatsu Akira
Yamada Masanori
Adams Russell E.
Canon Kabushiki Kaisha
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