US3775605A - Lighting fitting for a u-shaped gas discharge lamp - Google Patents
Lighting fitting for a u-shaped gas discharge lamp Download PDFInfo
- Publication number
- US3775605A US3775605A US00203568A US3775605DA US3775605A US 3775605 A US3775605 A US 3775605A US 00203568 A US00203568 A US 00203568A US 3775605D A US3775605D A US 3775605DA US 3775605 A US3775605 A US 3775605A
- Authority
- US
- United States
- Prior art keywords
- light sources
- light
- refractor
- reflector
- lighting fitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
Definitions
- 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.
- the invention relates to a lighting fitting for two elongate light sources extending parallel to' each other, preferably a U-shaped gas discharge lamp, in whichthe longitudinal dimension of the lamp extends-parallel to a street surface to be illuminated, and the light intensity, calculated from the street surface directly below the lighting fitting to that place of the street surface where thelight rays impinge upon said street surface at a more acute angle, increases.
- a lightingfitting is
- the invention provides a lighting fitting which meets the said need.
- the lighting fitting according to the invention is characterized in that the lighting fitting is constructed to hold the lamp in the operatingcondition in such manner that the plane containingthe limbs of the lamp is transverse to the street surface to be illuminated.
- a reflector is arranged on either side of said plane, and a refractor is present between the lamp and the reflector; the part of the reflector'closer to the street surface to be illuminated reflects the light rays of i the limb closer to the street inan unrefractcd mannerand reflects the light rays originating from the other limb in a refracted'manner.
- the upperpart only reflects the refracted light rays originating from the two limbs, and the reflector is shaped'so that the unrefracted reflected light rays impinge farther from the lighting fitting than the refracted reflected light rays.
- the lighting fitting provides a reflectorsystem of which the lower part mainly supplies a sharp beam of directly reflected light'which is directed to larger distances from the lighting fitting.
- the uppermost part of the reflector in principle reflects only refracted'light which thus produces a smaller intensity of reflected radiation. This light impinges mainly between the previously mentioned beam and the light beam straightbelow the lamp. Together with the higher impinging radiation reflected by the trough-shaped mirror it isachieved that a very gradually increasing light intensity is obtained from directly below the lighting fitting to larger distances outside the lighting fitting; The light intensity of said fitting therefore varies very uniformly over a large illumination area.
- FIG. 1 is a cross-sectional view of the lighting fitting and FIG. 2 shows the illumination resultin a polar di-agram.
- the lighting fitting according to the invention comprises a U-shaped gas discharge-lamp which is'incorporated in a frameand the limbs of which-are denoted by l' and 3;
- the frame comprises a-plate 5which is reflecting-on its lower side and which has the curved reflector members7; the curvature of said. reflector members is substantially parabolic; F is the focus.
- a trough-shaped mirror in this case a V-shaped'mirror 11, is arranged above the lamp.
- the drawing only shows the cross-sectional view.
- the lighting fitting shown is elongate viewed in a direction transverse to the .plane of the drawing.
- the rays 13 which are directed downwards immediately supply a beam which is denoted by 15in the polar diagram shown in FIG. 2.
- the rays 17 emerginglaterally' from the lower limb l can directly impinge upon the part 19 of the reflector 7'and due to the parabolic shape of said reflector they are reflected'substantially parallel to each other (ray 21); they produce a beam 23'the brightness effect of which is large at'a great distance from the lighting fitting.
- the rays 26 which emerge from the lower limb 1- and first impinge upon the refractor plate 9 and then on the reflector 7 are scattered and, after'reflection ray 28) by the part 35 of the reflector 7, are reflected with a'reduced intensity; the rays originatingfrom said'part impinge in the beam area 39 (see FIG. 2).
- the rays 27 emerging from the upper limb 3 after refraction by refractor 9 impinge upon the reflector plates 7'; they will be scatteredmore strongly (rays 29, 31, 33); the rays collectively impinging upon the reflectorpart'35 after refraction (rays 37) produce a beam 53of'low intensity (see FIG. 2).
- the V-shaped mirror 11- forms as it werefour'apparentlight sources of which only two are sh'own in FIG.
- a lighting arrangement comprising a lighting fitting and two elongate lightsources within said fitting.
- said lighting fitting comprising:
- 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;
- 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.
- 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.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7018379.A NL158911B (nl) | 1970-12-17 | 1970-12-17 | Wegverlichtingsarmatuur voor een u-vormige gasontladingslamp. |
Publications (1)
Publication Number | Publication Date |
---|---|
US3775605A true US3775605A (en) | 1973-11-27 |
Family
ID=19811819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00203568A Expired - Lifetime US3775605A (en) | 1970-12-17 | 1971-12-01 | Lighting fitting for a u-shaped gas discharge lamp |
Country Status (8)
Country | Link |
---|---|
US (1) | US3775605A (xx) |
BE (1) | BE776750A (xx) |
CA (1) | CA985245A (xx) |
DE (1) | DE2159581B2 (xx) |
FR (1) | FR2118751A5 (xx) |
GB (1) | GB1337330A (xx) |
IT (1) | IT943965B (xx) |
NL (1) | NL158911B (xx) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4825341A (en) * | 1987-11-17 | 1989-04-25 | Fiberstars, Inc. | Cooled lighting apparatus and method |
DE4443741A1 (de) * | 1994-12-08 | 1996-06-13 | Hartmut S Engel | Leuchte |
US20040160757A1 (en) * | 2003-02-17 | 2004-08-19 | Kuo Heng Sheng | Backlight module |
US20090225551A1 (en) * | 2008-03-07 | 2009-09-10 | Industrial Technology Research Institute | Illumination apparatus |
US20100265720A1 (en) * | 2009-04-15 | 2010-10-21 | Tong Zhang | Reflector and system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2366216A (en) * | 1942-02-14 | 1945-01-02 | Dorsey Spencer H | Shield for mercury vapor lamps |
US2878369A (en) * | 1954-04-29 | 1959-03-17 | Philips Corp | Lighting fixture |
US2882389A (en) * | 1954-06-30 | 1959-04-14 | Philips Corp | Lighting fitting for road illumination |
-
1970
- 1970-12-17 NL NL7018379.A patent/NL158911B/xx unknown
-
1971
- 1971-12-01 US US00203568A patent/US3775605A/en not_active Expired - Lifetime
- 1971-12-01 DE DE19712159581 patent/DE2159581B2/de active Granted
- 1971-12-14 GB GB5794071A patent/GB1337330A/en not_active Expired
- 1971-12-14 IT IT32398/71A patent/IT943965B/it active
- 1971-12-15 BE BE776750A patent/BE776750A/xx unknown
- 1971-12-16 CA CA130,264A patent/CA985245A/en not_active Expired
- 1971-12-17 FR FR7145447A patent/FR2118751A5/fr not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2366216A (en) * | 1942-02-14 | 1945-01-02 | Dorsey Spencer H | Shield for mercury vapor lamps |
US2878369A (en) * | 1954-04-29 | 1959-03-17 | Philips Corp | Lighting fixture |
US2882389A (en) * | 1954-06-30 | 1959-04-14 | Philips Corp | Lighting fitting for road illumination |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4825341A (en) * | 1987-11-17 | 1989-04-25 | Fiberstars, Inc. | Cooled lighting apparatus and method |
DE4443741A1 (de) * | 1994-12-08 | 1996-06-13 | Hartmut S Engel | Leuchte |
US20040160757A1 (en) * | 2003-02-17 | 2004-08-19 | Kuo Heng Sheng | Backlight module |
US6923554B2 (en) * | 2003-02-17 | 2005-08-02 | Heng Sheng Kuo | Backlight module |
US20090225551A1 (en) * | 2008-03-07 | 2009-09-10 | Industrial Technology Research Institute | Illumination apparatus |
US8449149B2 (en) | 2008-03-07 | 2013-05-28 | Industrial Technology Research Institute | Illumination apparatus |
US20100265720A1 (en) * | 2009-04-15 | 2010-10-21 | Tong Zhang | Reflector and system |
US8162504B2 (en) * | 2009-04-15 | 2012-04-24 | Sharp Kabushiki Kaisha | Reflector and system |
Also Published As
Publication number | Publication date |
---|---|
CA985245A (en) | 1976-03-09 |
BE776750A (fr) | 1972-06-15 |
IT943965B (it) | 1973-04-10 |
NL158911B (nl) | 1978-12-15 |
GB1337330A (en) | 1973-11-14 |
NL7018379A (xx) | 1972-06-20 |
DE2159581A1 (de) | 1972-07-13 |
FR2118751A5 (xx) | 1972-07-28 |
DE2159581B2 (de) | 1977-05-12 |
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