Electric reflector lamp

Details Electric reflector lamp Electric reflector lamp

1982-04-12

1985-03-19

Moore, David K.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

313634, H01K 128, H01K 132

Patent

active

045061858

ABSTRACT:
An electric reflector lamp according to the invention has a blown lamp envelope comprising a concave internally mirror-coated wall portion, a spherical internally mirror-coated wall portion opposite thereto, an annular translucent wall portion between the first two portions and a tubular wall portion at the apex of the concave wall portion. These wall portions constitute a single blow moulding. The axes of the mirror-coated wall portions coincide, just like their focus and center of curvature, around which a light source is arranged. The concave wall portion is parabolic or elliptic, the second focus lying outside the lamp envelope. The parts of the mirror-coated wall portions, which throw light rays after at most two reflections through the translucent wall portion to the exterior, surround the focus through a solid angle of more than 1.5 .pi.sr. The spherical wall portion constitutes a mask which prevents light rays from the light source from reaching the translucent wall portion other than after reflection. The lamp does not emit stray light and very effectively concentrates the radiated light.

REFERENCES:
patent: 1436308 (1922-11-01), Evans
patent: 2120836 (1938-06-01), Grimes
patent: 2398970 (1946-04-01), Singer

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