Zoom light apparatus

Details Zoom light apparatus Zoom light apparatus

1979-12-18

1981-10-06

Lechert, Jr., Stephen J.

Illumination

Photographic lighting

Including specific light modifier

362 18, 362268, 362331, G03B 1502

Patent

active

042938929

ABSTRACT:
A zoom lighting device for projecting a generally rectangular illumination pattern whose size can be selectively changed. The device comprises a paraboloidal reflector and an artificial light source which cooperate to provide a collimated to nearly collimated beam of light which is circular in cross-section. The circularly-shaped light beam is intercepted by a pair of movably mounted crossed lenticular screens that are optically structured to change the circularly-shaped beam to a diverging generally rectangularly-shaped beam whose angles of divergence can be selectively changed by moving the screens relative to one another.

REFERENCES:
patent: 4158222 (1979-06-01), Cook

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