Illumination – Light source and modifier – Plural serial lens elements or components
Patent
1986-12-12
1988-04-19
Davis, Jr., Albert W.
Illumination
Light source and modifier
Plural serial lens elements or components
362289, 362308, 362296, F21V 1304
Patent
active
047394560
ABSTRACT:
In a spot projector having a reflector, a coiled filament lamp, a gate and a lens, improved light output efficiency is provided by locating the virtual filament center intermediate the reflector and the natural focus of the reflector. The gate is provided with an aperture which is substantially equal to or larger than the aperture of the reflector to accomodate the divergence of light rays produced by locating the filament to the rear of the focus point. Because the distribution of the light rays which emanate from the filament approximates a cosine distribution, and because the location of the virtual filament is behind the actual focus point, the percentage of light rays which are projected transversely through a region between the reflector and the gate is substantially reduced, and a correspondingly greater amount of filament illumination is reflected through the gate aperture, thereby producing a brighter image than would be produced by the same lamp located forward of the focus.
REFERENCES:
patent: 2055217 (1936-09-01), Gauthier
patent: 2129676 (1938-09-01), Creehan
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patent: 3735125 (1973-05-01), Wilms
patent: 3768900 (1923-10-01), McLintic
patent: 4232359 (1980-11-01), Leon
patent: 4519020 (1985-05-01), Little
patent: 4523257 (1985-06-01), Mori
Davis Jr. Albert W.
Griggs Dennis T.
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