Illumination – Supported by vehicle structure – Condition responsive
Patent
1982-01-11
1984-01-03
Perkey, William B.
Illumination
Supported by vehicle structure
Condition responsive
362 18, G03B 1505
Patent
active
044239408
ABSTRACT:
A photographic equipment provided with a focal-length sensing means for sensing the focal length of a photographic lens mounted on a camera body and generating the electrical output signal representative of the detected focal length and a beam-angle control means responsive to the output signal from the focal-length sensing means for changing, in response to the detected focal length, the beam angle of an electronic flash unit mounted on the camera body.
REFERENCES:
patent: 3738240 (1973-06-01), Mitani et al.
patent: 3843231 (1974-10-01), Borel et al.
patent: 4141059 (1979-02-01), Shiojiri
patent: 4323952 (1982-04-01), Proske
patent: 4325621 (1982-04-01), Iwata et al.
Iwata Hiroshi
Kashihara Toshitsugu
Morioka Akitoshi
Yoshino Tsunemi
Perkey William B.
West Electric Co. Ltd.
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