Illumination – Light source and modifier – Including reflector
Patent
1995-09-25
1997-11-25
Lazarus, Ira S.
Illumination
Light source and modifier
Including reflector
362348, F21V 712
Patent
active
056904223
ABSTRACT:
A fan-line optical principle for use in the design of faceted specular reflectors for sharp-cutoff luminaires is disclosed, and a luminaire embodying this optical principle is described. The luminaire described comprises a high intensity arc discharge lamp, providing a primary light source with finite length and thickness, and a reflector including a plurality of specular reflecting facets with fan-line geometry. Each of these fan-line facets displays (in a given main beam direction) a primary light source image that is parallel and adjacent to the cutoff edge of that facet. The name of this invention relates to the fact that a perspective view toward the front of a sharp-cutoff luminaire embodying the invention shows that fan-line facets, and the images they produce, create a fan-like pattern. An important characteristic of the invention is that the images of the primary light source displayed by fan-line facets, at a given main beam angle, can show substantially all of the primary light source.
REFERENCES:
patent: 704711 (1902-07-01), Carlstedt
patent: 1284019 (1918-11-01), Wood
patent: 4575788 (1986-03-01), Lewin
patent: 5192124 (1993-03-01), Kawashima et al.
patent: 5426575 (1995-06-01), Richards
Lazarus Ira S.
Lighting Research & Development, Inc.
Raab Sara Sachie
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