Electronic flash device

Details Electronic flash device Electronic flash device

1985-07-25

1986-09-09

Hix, L. T.

354416, G03B 7097

Patent

active

046105255

ABSTRACT:
In a flash device arranged to determine the aperture value of a photo-taking lens according to the measured level of a reflection light obtained by preliminary flashing and to control main flashing according to a light control level corresponding to the aperture value, when a light diffusing panel is arranged in front of a main flashing part for a wider flash illuminating angle, another light diffusing panel which gives an equal light reducing effect is also arranged for a preliminary flashing part. The light quantity of preliminary flashing is thus reduced in proportion to the degree of reduction in the light quantity of main flashing, so that the aperture value set by preliminary flashing and the light controllable range of main flashing for photographing can be made to be always in agreement with each other.

REFERENCES:
patent: 4305647 (1981-12-01), Ishida
patent: 4465353 (1984-08-01), Yoshida et al.
patent: 4501481 (1985-02-01), Kataoka et al.

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