Electronic flash device capable of automatically controlling the

Details Electronic flash device capable of automatically controlling the Electronic flash device capable of automatically controlling the

1982-12-14

1984-04-10

Adams, Russell E.

354484, G03B 1505

Patent

active

044417977

ABSTRACT:
An electronic flash device capable of automatically controlling the quantity of a flash of light or a flash duration in response to the intensity of light reflected from a subject, is provided with a means which is responsive to an electrical signal, which is derived from a camera or an arithmetic circuit incorporated in the electronic flash device and represents one of a plurality of f numbers which is selected, so as to control a flash light control means which in turn, for instance, determines a flash duration of a flash lamp and hence the quantity of a flash of light emitted therefrom. Therefore, the quantity of a flash of light can be controlled in steps equal in number to f numbers which can be selected.

REFERENCES:
patent: 4274722 (1981-06-01), Nomata
patent: 4275953 (1981-06-01), Watanabe et al.
patent: 4285582 (1981-08-01), Yamazaki
patent: 4294528 (1981-10-01), Ohta et al.
patent: 4379983 (1983-04-01), Takematsu

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