Lamp with improved photometric distribution

Details Lamp with improved photometric distribution Lamp with improved photometric distribution

1988-10-17

1991-01-29

DeMeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

H01J 516

Patent

active

049889117

ABSTRACT:
A light bulb is provided has a lamp base electrically connecting a radiant light source and supporting the light source on a central axis. An envelope is supported from the base, comprising a generally tubular transmissive portion adjacent to the base and a generally reflective portion contiguous with the transmissive portion and completing enclosure of the light source. The reflective portion is in the form of a concave curve of revolution having a first focus at the light source and configured to direct the light from the source through the transmissive portion of the envelope at approximately a 45.degree. angle from the central axis, and wherein the 45.degree. angle is rotated to form a depending cone of light. A preferred embodiment has an envelope including a partially transmissive reflector and a tubular window as an optically transmissive light diffuser.

REFERENCES:
patent: Re30832 (1981-12-01), La Giusa
patent: 2510421 (1950-06-01), Rygard et al.
patent: 4506185 (1985-03-01), Giller et al.
patent: 4777400 (1988-10-01), Roelevink

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