Reflector for varying illumination distribution

Details Reflector for varying illumination distribution Reflector for varying illumination distribution

1980-05-30

1982-04-06

Lechert, Jr., Stephen J.

Illumination

Photographic lighting

Including specific light modifier

362 18, 362276, 362280, 362308, 362318, G03B 1502

Patent

active

043239528

ABSTRACT:
The angular distribution of illumination passing through a selectively diffusing element can be varied by placing the diffusing element in a reflector unit so that the diffusing element is in the path between a light source and the object to be illuminated. A variable diffuser can comprise a liquid-crystal cell driven by a variable voltage to control the amount of diffusion by the reflector unit. The control voltage can be set in accordance with change in focal length in a zoom lens of a camera using the light source and reflector unit as a flash gun.

REFERENCES:
patent: 4068931 (1978-01-01), Weaks

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