Flash light with pre-emission control

Details Flash light with pre-emission control Flash light with pre-emission control

1982-12-27

1984-11-27

Adams, Russell E.

354421, 354423, G03B 700, G03B 1505

Patent

active

044848072

ABSTRACT:
A flash photographing device of the type which detects the distance up to an object by a preliminary flash emission so as to control the diaphragm according to the detailed object distance, while the light adjusting level of the light adjusting speed light device is set according to the detected object distance. In the case of a flash photographing device of this type, a proper exposure can be guaranteed when a detected object distance is within the range of the operational engagement of a light adjusting circuit, while the exposure is improper when the distance is beyond the range. The arrangement of the present invention provides a flash photographing device of the above-described type which controls the diaphragm at the smallest aperture value of the lens independently of the value of a detected object distance when the detected object distance is beyond the range of operative engagement. By setting the light adjusting level at the highest or lowest level, a proper exposure can be obtained even when the detected object distance is beyond the range of operative engagement.

REFERENCES:
patent: 3913111 (1975-10-01), Tokutomi
patent: 4256995 (1981-03-01), Ishida
patent: 4305647 (1981-12-01), Ishida
patent: 4327978 (1982-05-01), Ishida et al.

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