Photographic illumination apparatus

Details Photographic illumination apparatus Photographic illumination apparatus

1984-12-05

1987-01-06

Dixon, Harold

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

250205, 315156, 315194, 315307, H05B 3702

Patent

active

046349332

ABSTRACT:
The present invention provides a photographic lighting apparatus for illuminating a photographic object in taking the object with a camera such as a television camera or an 8 mm movie camera. The photographic lighting apparatus is capable of illuminating the object practically at a fixed intensity of illumination regardless of the variation of the distance between the object and the lamp thereof by reducing the brightness of the lamp when the object is located near to the lamp and increasing the same when the object is located remotely. The brightness of the lamp is regulated by controlling the conduction angle of a thyristor connected to the lamp according to the output signal of a photometric circuit which measures the intensity of illumination of the object.

REFERENCES:
patent: 3684919 (1972-08-01), Cramer
patent: 4190795 (1980-02-01), Schultheis
patent: 4250488 (1981-02-01), Haupt
patent: 4275335 (1981-06-01), Ishida
patent: 4346331 (1982-08-01), Hoge
patent: 4396869 (1983-08-01), Rosenbaum et al.

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