Illumination – Light source and modifier – Ionized gas or vapor light source
Patent
1981-05-19
1983-08-23
Walsh, Donald P.
Illumination
Light source and modifier
Ionized gas or vapor light source
362 61, 362268, 362293, 362297, 362302, 362305, 350171, 350174, F21V 900
Patent
active
044007647
ABSTRACT:
Methods and apparatus are disclosed for shaping illuminating beams from continuous duty searchlights or the like so as to minimize the effect of backscattered illumination and, to thereby increase the brightness contrast between illuminated target objects and background so as to improve visibility. More specifically, a continuous duty illumination system comprising an optical system in which the distribution of the light beam entering the entrance pupil of the optical system comprises a collimated beam of high radiant intensity which is thereafter split along an axis bisecting the distributional pattern, or image, with light from the respective halves of the distribution image being directed first in opposite directions and then being redirected in substantially parallel directions; and, wherein light from each half of the split distribution is imaged into respective ones of a pair of collimating lenses with each lens receiving light only from the upper half of its focal plane so that the parallel beams leaving the exit pupils of the optical system contain light only in the space below a generally horizontal plane passing through and containing the optical axes of the system.
REFERENCES:
patent: 2202278 (1940-05-01), White
patent: 2215203 (1940-09-01), Young
patent: 2241128 (1941-05-01), Harley
patent: 2503500 (1950-04-01), Lowry
patent: 3457401 (1969-07-01), Hoekstra
patent: 4192578 (1980-03-01), Suzuki
patent: 4206494 (1980-06-01), Lovering
patent: 4367519 (1983-01-01), Houghton
The Boeing Company
Walsh Donald P.
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