US3775605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting fitting for a u-shaped gas discharge lamp
Assignee: US Philips Corp
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Filing: 1971-12-01
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Granted: 1973-11-27
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Expires: 1991-12-01
Abstract
Abstract A lighting fitting which comprises a preferably U-shaped gas discharge lamp in which the space above the lamp is covered by a trough-shaped mirror, and a refractor plate and a reflector are arranged on either side of the lamp. This lighting fitting provides a street surface illumination the intensity of which varies uniformly over a wide area on either side of the elongate light source.
Inventors
- 👤 J Rijnders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:57
CPC Classifications
F; F21; F21V; F21V13/00; F21V13/02; F21V13/04; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
210 words
A lighting arrangement comprising a lighting fitting and two elongate light sources within said fitting and extending parallel to each other, such as a U-shaped discharge lamp having two parallel legs, said lighting fitting comprising: means for holding said elongated light sources in a plane which is transverse to a surface to be illuminated; a reflector, having an upper plate and at least one side plate of predetermined concave shape, the upper plate extending parallel to the surface to be illuminated and superposed above the light sources, the upper and side plates having inner surfaces adapted to reflect light cast from said light sources; and a refractor, said refractor being positioned adjacent to the light sources in a plane parallel to the light sources and between the light sources and the side plate, said refractor being affixed to the upper plate and extending to a point adjacent to the lower light source, said refractor adapted to refract light directed from said upper light source toward the side plate of said reflector without substantially refracting light directed from said lower light source toward the side plate of the reflector, said refractor also adapted to refract light directed from both upper and lower light sources toward the upper plate of the reflector.
Claim 2
Dependent Claim
210 words
A lighting arrangement comprising a lighting fitting and two elongate light sources within said fitting and extending parallel to each other, such as a U-shaped discharge lamp having two parallel legs, said lighting fitting comprising: means for holding said elongated light sources in a plane which is transverse to a surface to be illuminated; a reflector, having an upper plate and at least one side plate of predetermined concave shape, the upper plate extending parallel to the surface to be illuminated and superposed above the light sources, the upper and side plates having inner surfaces adapted to reflect light cast from said light sources; and a refractor, said refractor being positioned adjacent to the light sources in a plane parallel to the light sources and between the light sources and the side plate, said refractor being affixed to the upper plate and extending to a point adjacent to the lower light source, said refractor adapted to refract light directed from said upper light source toward the side plate of said reflector without substantially refracting light directed from said lower light source toward the side plate of the reflector, said refractor also adapted to refract light directed from both upper and lower light sources toward the upper plate of the reflector.
Claim 3
Dependent Claim
28 words
The lighting fitting of claim 1 wherein the predetermined concave shape of the inner surface of the side plate of the reflector is a portion of a parabola.
Claim 4
Dependent Claim
35 words
A lighting fitting as claimed in claim 1 wherein the refractor includes means to scatter light, said means scattering light by an amount which decreases as a function of the distance from the upper plate.
Claim 5
Dependent Claim
108 words
A lighting fitting as claimed in claim 1 also comprising a second refractor, both being shaped as flat plate refractors, said refractors being situated on either side of the plane passing through the light sources and approximately symmetric about said plane, and also comprising a second concave side plate having an inner reflecting surface, said side plates being approximately equidistant from the plane of the light sources, and wherein a V-shaped mirror is positioned above the light sources and between the refractors, the mirror having side edges which abut the refractor edges adjacent to the upper plate, the apex of the V being directed toward the light sources.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |