Electronic flash device

Details Electronic flash device Electronic flash device

1981-05-14

1982-04-20

Griffin, Donald A.

Illumination

Supported by vehicle structure

Condition responsive

354286, 362 18, G03B 1503, G03B 1700

Patent

active

043256210

ABSTRACT:
In an electronic flash device used as an artificial light source in photography, a liquid crystal plate or window is disposed in front of a flash unit comprising a flash lamp and a reflector and a voltage is applied or not applied to the liquid crystal plate or window depending upon the type; that is, the focal length or angle of view of a photographic lens attached to a camera body, whereby the angle of flash illumination can be varied suitably depending upon the lens type.

REFERENCES:
patent: 3167256 (1965-01-01), Elliott
patent: 3517196 (1970-06-01), Owens
patent: 3821765 (1974-06-01), Wagner et al.
patent: 3823411 (1974-07-01), Hasegawa et al.
patent: 4196997 (1980-04-01), Ohmori et al.
patent: 4275953 (1981-06-01), Watanabe et al.

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