Gradient index zoom illuminator

Details Gradient index zoom illuminator Gradient index zoom illuminator

1989-01-26

1990-04-10

Husar, Stephen F.

Illumination

Photographic lighting

Including specific light modifier

362 61, 362187, 362259, 362319, G03B 1502

Patent

active

049165798

ABSTRACT:
A gradient index zoom illuminator which may be used for visible or infrared illumination comprises a housing which has a light exit opening in it. A point or collimated light source is mounted in the housing. A gradient index lens, having a central axis, also is mounted in the housing between the light source and the light exit opening in the housing; and the light source is located on the axis of the lens. Focusing of the light exiting from the light exit opening of the housing is accomplished by changing the relative distance between the light source and the gradient index lens to vary the beam of emitted light from a maximum divergence to to a narrow collimated beam.

REFERENCES:
patent: 4141059 (1979-02-01), Shiojiri
patent: 4185891 (1980-01-01), Kaestner
patent: 4293892 (1981-10-01), Plummer

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