High voltage movie light and incandescent lamp unit for use ther

Details High voltage movie light and incandescent lamp unit for use ther High voltage movie light and incandescent lamp unit for use ther

1978-09-06

1979-09-25

Demeo, Palmer C.

Electric lamp and discharge devices

Plural unit

313115, 313116, H01K 114, H01K 132

Patent

active

041692373

ABSTRACT:
A high voltage movie light including a plastic holder, a pair of spaced-apart incandescent lamp units positioned within the holder, and means for electrically connecting the lamp units to an external power source. Each lamp unit comprises a formed glass reflector and a tungsten-halogen lamp located within the reflector and having a planar, dual filament structure therein. The lamp units are positioned within the holder such that the planes occupied by the respective dual filament structures intersect at a predetermined angle, e.g. 90 to 110 degrees, in order that the light output from each unit will be centered on a respective diagonal of the rectangular subject field being illuminated by the movie light. Each unit produces a bimodal intensity distribution, thus further assuring increased illumination levels on the subject field. An incandescent lamp unit suitable for use in the movie light is also disclosed.

REFERENCES:
patent: 2387038 (1945-10-01), Owens
patent: 2411568 (1946-11-01), Foote
patent: 2810660 (1957-10-01), Carpenter
patent: 4021659 (1977-05-01), Wiley

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