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EP0881425B1 - Lamp - Google Patents

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Publication number
EP0881425B1
EP0881425B1 EP98109485A EP98109485A EP0881425B1 EP 0881425 B1 EP0881425 B1 EP 0881425B1 EP 98109485 A EP98109485 A EP 98109485A EP 98109485 A EP98109485 A EP 98109485A EP 0881425 B1 EP0881425 B1 EP 0881425B1
Authority
EP
European Patent Office
Prior art keywords
reflector
facets
convergent
divergent
light according
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
Application number
EP98109485A
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German (de)
French (fr)
Other versions
EP0881425A2 (en
EP0881425A3 (en
Inventor
Christian Bartenbach
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Individual
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Publication of EP0881425A2 publication Critical patent/EP0881425A2/en
Publication of EP0881425A3 publication Critical patent/EP0881425A3/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/09Optical design with a combination of different curvatures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/0066Reflectors for light sources specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified

Definitions

  • the invention relates to a lamp with a light source and a reflector at least one convergent and at least one divergent reflector section having.
  • Such a reflector is known for example from DE 87 03 494 U. If overlap the areas illuminated by the individual reflector sections, can compensate for inaccuracies of the reflector and thus the Production tolerances are increased.
  • the object of the invention is to create a new type of lamp which is used in a excellent light distribution has a visually appealing appearance and has relatively large fault tolerances in manufacture.
  • this is achieved in a luminaire of the type mentioned at the outset by that the convergent reflector section is essentially surface-covering with a Faceting is provided and the adjoining the faceted reflector section divergent reflector section has a smooth inner surface, so that the Transition point from the convergent to the divergent reflector section in the essentially with the transition point from the faceted to the smooth inner Surface collapses.
  • the change between the faceted and the smooth So surface essentially runs on the border between the two Reflector sections.
  • the lamp has two Reflector sections, of which the inner, the light source adjacent Reflector section is convergent and faceted and the adjoining outside Reflector section is divergent and smooth.
  • the preferred embodiment shown in FIGS. 1 and 2 reflector according to the invention has an inner, the light source 1 adjacent convergent reflector section 2 and then a divergent outside Reflector section 3.
  • the reflector is made in one piece and the two Reflector sections 2, 3 are continuous and kink-free in the transition region 8 connected.
  • the term convergent reflector section means that two Rays 4, 5 converging on adjacent points of a cross-sectional line Hit reflector section 2, intersect in the further beam path. rays that point to adjacent points of a cross-sectional line of the divergent On the other hand, the reflector section 3 strikes run in the further beam path apart.
  • the angle of the beam changes in the transition region 8 between the two sections 2, 3 not.
  • the angle of reflection of the most divergent Reflector section 3 reflected rays 9-14 decrease from the inside to the outside, so that the angle of reflection ⁇ of the outermost beam 14 is again approximately 0 °.
  • the area illuminated by the luminaire is therefore used by both Reflector sections 2, 3 fully illuminated, the im Transition area 8 between the two reflector sections 2, 3 reflected Rays lie just on the outer edge of the illuminated area.
  • the reflector section 2 has facets 15 provided while the reflector section 3 is smooth, i.e. is unfacetted.
  • the facets 15 of section 2 can be designed as cylinder, torus or spherical surfaces and be concave, convex or mixed concave / convex.
  • the arrangement of the facets can be plaster-shaped (with spherical facets), or the facets can according to the embodiment shown along radial lines 16 of the Be arranged reflector.
  • the facets are designed such that a parallel beam for example expanded to 2x15 °.
  • the optimal degree of expansion is from depending on the shape of the total reflector and is usually between 2x10 ° and 2x40 ° between 2x15 ° and 2x30 °.
  • the beam expansion caused by the faceting 15 causes the Structure of light source 1 is not imaged on the surface illuminated by the lamp becomes. Such an image could be by the reflector section 3 alone are caused, the superposition with the light from the reflector section 2 but causes that altogether no or hardly such an annoying image from Viewer can be perceived. Since the faceting 15 just at the Border between the two reflector sections 2, 3 ends, the from Edge area of the faceting 15 reflected rays straight to the edge of the pictured illuminated area. Any the edge area of the faceting touch any another location of the reflector, this edge area would be within the Illuminated area are mapped and become perceptible and distracting Discontinuities in illuminance result. At the edge of the illuminated On the other hand, such discontinuities do not disturb the surface, since there is a discontinuity in anyway Form of a change between light and dark.
  • the reflector surface for both the faceted and the smooth area is preferably specular or high-gloss, for example in the form of shiny or anodized aluminum.
  • the reflector according to the invention makes it uniform To achieve light distribution with relatively large manufacturing tolerances, further from Avoid facets of local glare and optically special to provide an attractive reflector.
  • a reflector according to the invention can also have more than two reflector sections have, the total area illuminated by the lamp several times can be illuminated so that there are deviations from the optimal light distribution find out even better. At least one of the sections is faceted and at least one of the sections is smooth, alternating between faceted and smooth in the border area between a converged and a diverged section of the reflector.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

The reflector has at least one convergent or diverging reflector sections (2,3) with facets (15) covering the surface. A divergent or convergent reflector section (3) adjoining the facetted reflector section (2) has a smooth inner surface. The reflector sections can be alternately convergent and divergent. The innermost reflector section is preferably convergent and has facets covering the surface. The facets are shaped so that the expansion of the parallel beam is preferably between 2 x 15 degs to 2 x 30 degs. The facets can have a cylindrical, toroidal or ball shape.

Description

Die Erfindung betrifft eine Leuchte mit einer Lichtquelle und einem Reflektor, der zumindest einen konvergenten und zumindest einen divergenten Reflektorabschnitt aufweist.The invention relates to a lamp with a light source and a reflector at least one convergent and at least one divergent reflector section having.

Ein solcher Reflektor ist beispielsweise aus der DE 87 03 494 U bekannt. Wenn sich die von den einzelnen Reflektorabschnitten beleuchteten Flächen überschneiden, können dadurch Ungenauigkeiten des Reflektors ausgeglichen werden und damit die Produktionstoleranzen erhöht werden.Such a reflector is known for example from DE 87 03 494 U. If overlap the areas illuminated by the individual reflector sections, can compensate for inaccuracies of the reflector and thus the Production tolerances are increased.

Aus der US 3,401,258 ist es bekannt, Reflektoroberflächen mit einer Facettierung zu versehen. Auf diese Weise wird insbesondere eine unerwünschte Abbildung der Struktur der Lichtquelle auf die zu beleuchtenden Fläche vermieden. Eine Leuchte mit einem flächendeckend mit einer Facettierung versehenen Reflektorabschnitt geht aus der GB 2 123 942 A hervor. Durch diese Maßnahme werden Ungenauigkeiten des Reflektors ausgeglichen und damit die Produktionstoleranzen erhöht. Eine facettierte Reflektoroberfläche hat aber den Nachteil, daß sie aufgrund der Facetten in ihrem Erscheinungsbild auf den Betrachter unruhig und somit optisch weniger ansprechend wirkt. Weiters kann es durch Reflexion an den Facetten auch außerhalb des eigentlichen Beleuchtungswinkels der Leuchte zu lokalen Blendungen kommen.From US 3,401,258 it is known to provide reflector surfaces with a facet Mistake. In this way, an undesired image of the Structure of the light source avoided on the surface to be illuminated. A lamp with a surface covering with a faceting reflector section goes out GB 2 123 942 A. This measure will inaccuracies Reflector balanced and thus increased the production tolerances. A faceted However, the reflector surface has the disadvantage that it is due to the facets in its Appearance uneasy to the viewer and thus less visually appealing acts. Furthermore, by reflection on the facets, it can also be outside the actual lighting angle of the luminaire to local glare.

Aufgabe der Erfindung ist die Schaffung einer neuartigen Leuchte, welche bei einer hervorragenden Lichtverteilung ein optisch ansprechendes Erscheinungsbild besitzt und bei der Herstellung relativ große Fehlertoleranzen aufweist.The object of the invention is to create a new type of lamp which is used in a excellent light distribution has a visually appealing appearance and has relatively large fault tolerances in manufacture.

Erfindungsgemäß gelingt dies bei einer Leuchte der eingangs genannten Art dadurch, daß der konvergente Reflektorabschnitt im wesentlichen flächendeckend mit einer Facettierung versehen ist und der an den facettierten Reflektorabschnitt anschließende divergente Reflektorabschnitt eine glatte innere Oberfläche aufweist, sodaß die Übergangsstelle vom konvergenten zum divergenten Reflektorabschnitt im wesentlichen mit der Übergangsstelle von der facettierten zur glatten inneren Oberfläche zusammenfällt. Der Wechsel zwischen der facettierten und der glatten Oberfläche verläuft also im wesentlichen an der Grenze zwischen den beiden Reflektorabschnitten. According to the invention, this is achieved in a luminaire of the type mentioned at the outset by that the convergent reflector section is essentially surface-covering with a Faceting is provided and the adjoining the faceted reflector section divergent reflector section has a smooth inner surface, so that the Transition point from the convergent to the divergent reflector section in the essentially with the transition point from the faceted to the smooth inner Surface collapses. The change between the faceted and the smooth So surface essentially runs on the border between the two Reflector sections.

Auf diese Weise können, wie in der anschließenden Figurenbeschreibung noch genauer ausgeführt wird, eine gleichmäßige Lichtverteilung und ein ansprechendes Äußeres realisiert werden. Weiters ist eine derartige Leuchte in der Herstellung relativ unaufwendig.In this way, as in the subsequent description of the figures is carried out more precisely, a uniform light distribution and an appealing Exterior can be realized. Furthermore, such a luminaire is relative to manufacture inexpensive.

In einem bevorzugten Ausführungsbeispiel der Erfindung weist die Leuchte zwei Reflektorabschnitte auf, von denen der innere, der Lichtquelle benachbarte Reflektorabschnitt konvergent und facettiert ist und der außen anschließende Reflektorabschnitt divergent und glatt ist.In a preferred embodiment of the invention, the lamp has two Reflector sections, of which the inner, the light source adjacent Reflector section is convergent and faceted and the adjoining outside Reflector section is divergent and smooth.

Weitere Vorteile und Einzelheiten der Erfindung werden im folgenden anhand der beiliegenden Zeichnung erläutert.Further advantages and details of the invention are described below with reference to the attached drawing explained.

In dieser zeigt

  • Fig. 1 einen schematischen Querschnitt durch einen erfindungsgemäßen Reflektor, wobei mehrere von der Lichtquelle ausgehende Strahlen eingezeichnet sind, und
  • Fig. 2 einen vergrößerten Teilabschnitt der Fig. 1 entlang der Linie A-A.
  • In this shows
  • Fig. 1 shows a schematic cross section through a reflector according to the invention, wherein several rays emanating from the light source are shown, and
  • Fig. 2 shows an enlarged portion of Fig. 1 along the line AA.
  • Das in den Fig. 1 und 2 dargestellte bevorzugte Ausführungsbeispiel eines erfindungsgemäßen Reflektors weist einen inneren, der Lichtquelle 1 benachbarten konvergenten Reflektorabschnitt 2 und außen anschließend einen divergenten Reflektorabschnitt 3 auf. Der Reflektor ist einstückig ausgebildet und die beiden Reflektorabschnitte 2, 3 sind im Übergangsbereich 8 stetig und knickfrei miteinander verbunden. Die Bezeichnung konvergenter Reflektorabschnitt bedeutet, daß zwei Strahlen 4, 5, die auf benachbarte Punkte einer Querschnittslinie des konvergenten Reflektorabschnitts 2 auftreffen, sich im weiteren Strahlenverlauf schneiden. Strahlen, die auf benachbarte Punkte einer Querschnittslinie des divergenten Reflektorabschnitts 3 auftreffen, laufen dagegen im weiteren Strahlenverlauf auseinander.The preferred embodiment shown in FIGS. 1 and 2 reflector according to the invention has an inner, the light source 1 adjacent convergent reflector section 2 and then a divergent outside Reflector section 3. The reflector is made in one piece and the two Reflector sections 2, 3 are continuous and kink-free in the transition region 8 connected. The term convergent reflector section means that two Rays 4, 5 converging on adjacent points of a cross-sectional line Hit reflector section 2, intersect in the further beam path. rays that point to adjacent points of a cross-sectional line of the divergent On the other hand, the reflector section 3 strikes run in the further beam path apart.

    Wenn man die am konvergenten Reflektorabschnitt 2 reflektierten Strahlen betrachtet, sieht man, daß deren Ausfallswinkel von den weiter innen reflektierten Strahlen zu den weiter außen reflektierten Strahlen zunimmt, und zwar von γ = 0° des Strahls 6 bis zum maximalen Aufallswinkel γmax des im Bereich 8 der Grenze zwischen den beiden Reflektorabschnitten 2, 3 reflektierten Strahls 7.If one looks at the rays reflected at the convergent reflector section 2, one sees that their angle of reflection increases from the rays reflected further inside to the rays reflected further outside, namely from γ = 0 ° of the beam 6 to the maximum angle of incidence γ max of in the range 8 of the boundary between the two reflector sections 2, 3 of reflected beam 7.

    Da der Übergang zwischen den beiden Reflektorabschnitten 2, 3 stetig und knickfrei ist, ändert sich der Ausfallswinkel der Strahlen im Übergangsbereich 8 zwischen den beiden Abschnitten 2, 3 nicht. Die Ausfallswinkel der am divergenten Reflektorabschnitt 3 reflektierten Strahlen 9-14 nehmen von innen nach außen ab, sodaß der Ausfallswinkel γ des äußersten Strahls 14 wieder annähernd 0° beträgt. Die von der Leuchte insgesamt beleuchtete Fläche wird somit von beiden Reflektorabschnitten 2, 3 jeweils vollständig ausgeleuchtet, wobei die im Übergangsbereich 8 zwischen den beiden Reflektorabschnitten 2, 3 reflektierten Strahlen gerade am äußeren Rand der beleuchteten Fläche liegen.Since the transition between the two reflector sections 2, 3 is continuous and kink-free is, the angle of the beam changes in the transition region 8 between the two sections 2, 3 not. The angle of reflection of the most divergent Reflector section 3 reflected rays 9-14 decrease from the inside to the outside, so that the angle of reflection γ of the outermost beam 14 is again approximately 0 °. The The area illuminated by the luminaire is therefore used by both Reflector sections 2, 3 fully illuminated, the im Transition area 8 between the two reflector sections 2, 3 reflected Rays lie just on the outer edge of the illuminated area.

    Wie aus der Fig. 1 und 2 ersichtlich, ist der Reflektorabschnitt 2 mit Facetten 15 versehen, während der Reflektorabschnitt 3 glatt, d.h. unfacettiert ist. Die Facetten 15 des Abschnitts 2 können als Zylinder-, Torus- oder Kugelfächen ausgebildet sein und dabei konkav, konvex oder gemischt konkav/konvex sein. Die Anordnung der Facetten kann dabei pflasterförmig sein (bei Kugelfacetten), oder die Facetten können entsprechend dem gezeigten Ausführungsbeispiel entlang radialer Linien 16 des Reflektors angeordnet sein. Die Facetten sind derart ausgebildet, daß ein Parallelstrahl beispielsweise auf 2x15° aufgeweitet wird. Der optimale Grad der Aufweitung ist von der Form des Gesamtreflektors abhängig und liegt zwischen 2x10° und 2x40°, meist zwischen 2x15° und 2x30°.As can be seen from FIGS. 1 and 2, the reflector section 2 has facets 15 provided while the reflector section 3 is smooth, i.e. is unfacetted. The facets 15 of section 2 can be designed as cylinder, torus or spherical surfaces and be concave, convex or mixed concave / convex. The arrangement of the facets can be plaster-shaped (with spherical facets), or the facets can according to the embodiment shown along radial lines 16 of the Be arranged reflector. The facets are designed such that a parallel beam for example expanded to 2x15 °. The optimal degree of expansion is from depending on the shape of the total reflector and is usually between 2x10 ° and 2x40 ° between 2x15 ° and 2x30 °.

    Die durch die Facettierung 15 hervorgerufene Strahlaufweitung bewirkt, daß die Struktur der Lichtquelle 1 nicht auf die von der Leuchte beleuchtete Fläche abgebildet wird. Eine solche Abbildung könnte zwar durch den Reflektorabschnitt 3 allein hervorgerufen werden, die Überlagerung mit dem Licht aus dem Reflektorabschnitt 2 bewirkt aber, daß insgesamt keine oder kaum eine solche störende Abbildung vom Betrachter wahrgenommen werden kann. Da die Facettierung 15 gerade an der Grenze zwischen den beiden Reflektorabschnitten 2, 3 endet, werden die vom Randbereich der Facettierung 15 reflektierten Strahlen gerade an den Rand der beleuchteten Fläche abgebildet. Würde der Randbereich der Facettierung an irgend einer anderen Stelle des Reflektors liegen, so würde dieser Randbereich innerhalb der beleuchteten Fläche abgebildet werden und dort zu wahrnehmbaren und störenden Diskontinuitäten in der Beleuchtungsstärke führen. Am Randbereich der beleuchteten Fläche stören solche Diskontinuitäten dagegen nicht, da ohnehin eine Diskontinuität in Form eines Wechsels zwischen hell und dunkel vorliegt.The beam expansion caused by the faceting 15 causes the Structure of light source 1 is not imaged on the surface illuminated by the lamp becomes. Such an image could be by the reflector section 3 alone are caused, the superposition with the light from the reflector section 2 but causes that altogether no or hardly such an annoying image from Viewer can be perceived. Since the faceting 15 just at the Border between the two reflector sections 2, 3 ends, the from Edge area of the faceting 15 reflected rays straight to the edge of the pictured illuminated area. Would the edge area of the faceting touch any another location of the reflector, this edge area would be within the Illuminated area are mapped and become perceptible and distracting Discontinuities in illuminance result. At the edge of the illuminated On the other hand, such discontinuities do not disturb the surface, since there is a discontinuity in anyway Form of a change between light and dark.

    Die Reflektorfläche sowohl für den facettierten wie auch für den glatten Bereich wird vorzugsweise spiegelnd bzw. hochglänzend, beispielsweise in Form von geglänztem oder eloxiertem Aluminium ausgebildet.The reflector surface for both the faceted and the smooth area is preferably specular or high-gloss, for example in the form of shiny or anodized aluminum.

    Da nur der innere Bereich 2 des Reflektors mit Facettierungen versehen ist, können diese Facettierungen 15 nur in einem Winkelbereich α unterhalb der Leuchte gesehen werden. Seitlich außerhalb dieses Bereiches ist nur ein Teil der glatten inneren Oberfläche des Reflektorabschnittes 3 einsehbar, wodurch die Leuchte optisch ansprechender wirkt. Ein weiterer Vorteil der erfindungsgemäßen Leuchte liegt darin, daß außerhalb des Winkelbereiches α eine lokale Blendung aufgrund von an den Facetten reflektierte Strahlen vermieden wird.Since only the inner region 2 of the reflector is provided with facets seen these facets 15 only in an angular range α below the lamp become. To the side of this area is only part of the smooth interior Surface of the reflector section 3 visible, which makes the lamp optically looks more appealing. Another advantage of the lamp according to the invention is that that outside the angular range α local glare due to the Faceted reflected rays is avoided.

    Durch den erfindungsgemäßen Reflektor gelingt es insgesamt eine gleichmäßige Lichtverteilung bei relativ großen Herstellungstoleranzen zu erzielen, weiters von Facetten herrührende lokale Blendungen zu vermeiden und einen optisch besonders ansprechenden Reflektor bereitzustellen.Overall, the reflector according to the invention makes it uniform To achieve light distribution with relatively large manufacturing tolerances, further from Avoid facets of local glare and optically special to provide an attractive reflector.

    Ein erfindungsgemäßer Reflektor kann auch mehr als zwei Reflektorabschnitte aufweisen, wobei die von der Leuchte insgesamt beleuchtete Fläche mehrfach beleuchtet sein kann, sodaß sich Abweichungen von der optimalen Lichtverteilung noch besser herausmitteln. Zumindest einer der Abschnitte ist dabei facettiert und zumindest einer der Abschnitte ist glatt, wobei der Wechsel zwischen facettiert und glatt im Grenzbereich zwischen einem konvergierten und einem divergierten Abschnitt des Reflektors liegt.A reflector according to the invention can also have more than two reflector sections have, the total area illuminated by the lamp several times can be illuminated so that there are deviations from the optimal light distribution find out even better. At least one of the sections is faceted and at least one of the sections is smooth, alternating between faceted and smooth in the border area between a converged and a diverged section of the reflector.

    Claims (7)

    1. A light comprising a light source and a dish-shaped, rotationally symmetrical reflector which, in a plane which includes the axis of rotation of the reflector, has an inner convergent reflector portion and an outer divergent reflector portion adjoining the inner reflector portion, characterised in that the convergent reflector portion (2) is provided with facetting (15) substantially covering its surface and the divergent reflector portion (3) adjoining the facetted reflector portion (2) has a smooth inner surface so that the transition (8) from the convergent to the divergent reflector portion (2, 3) substantially coincides with the transition (8) from the facetted to the smooth inner surface.
    2. A light according to claim 1 characterised in that the facets (15) are of such a shape that the enlargement of a parallel beam is between 2 x 10° and 2 x 40°, preferably between 2 x 15° and 2 x 30°.
    3. A light according to claim 2 characterised in that the facets (15) are in the shape of cylindrical, toric or spherical surfaces.
    4. A light according to one of claims 1 to 3 characterised in that the facets (15) are arranged along radial lines (16) of the reflector.
    5. A light according to one of claims 1 to 4 characterised in that the facets (15) are arranged in a cobbles form.
    6. A light according to one of claims 1 to 6 characterised in that the surfaces illuminated by the individual reflector portions (2, 3) substantially coincide.
    7. A light according to one of claims 1 to 6 characterised in that the light source (1) is a substantially punctiform light source (1).
    EP98109485A 1997-05-26 1998-05-26 Lamp Expired - Lifetime EP0881425B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    AT89197 1997-05-26
    AT89197 1997-05-26
    AT891/97 1997-05-26

    Publications (3)

    Publication Number Publication Date
    EP0881425A2 EP0881425A2 (en) 1998-12-02
    EP0881425A3 EP0881425A3 (en) 2000-02-23
    EP0881425B1 true EP0881425B1 (en) 2003-03-19

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98109485A Expired - Lifetime EP0881425B1 (en) 1997-05-26 1998-05-26 Lamp

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    EP (1) EP0881425B1 (en)
    AT (1) ATE235020T1 (en)
    DE (1) DE59807513D1 (en)

    Families Citing this family (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB9903182D0 (en) * 1999-02-13 1999-04-07 Abacus Holdings Ltd Improved reflector
    DE19910192C2 (en) * 1999-03-09 2002-04-04 Schott Auer Gmbh Reflector with a concave, rotationally symmetrical body and a faceted reflection surface
    DE10018831B4 (en) * 2000-04-15 2004-05-19 Markus Korsch reflector assembly
    DE102004058750A1 (en) * 2004-12-06 2006-06-08 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Single ended high pressure discharge lamp
    DE102013221163A1 (en) * 2013-10-18 2015-04-23 Zumtobel Lighting Gmbh Optical system for an LED light source and luminaire with such an optical system

    Family Cites Families (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3401258A (en) * 1966-10-17 1968-09-10 Edwin F Guth Company Luminaire reflector
    US4453203A (en) * 1982-07-19 1984-06-05 Harvey Hubbell Incorporated Lighting fixture reflector
    AT386671B (en) * 1986-03-24 1988-09-26 Zumtobel Ag LAMP WITH A LAMP AND WITH A REFLECTOR
    DE4237192A1 (en) * 1992-11-04 1994-05-05 Hoffmeister Leuchten Kg Electric lighting fitting with composite reflector for illumination control - has opposite facing sides of concave reflector formed respectively as concentric steps and smooth cone for additive reduced glare flux control.

    Also Published As

    Publication number Publication date
    DE59807513D1 (en) 2003-04-24
    ATE235020T1 (en) 2003-04-15
    EP0881425A2 (en) 1998-12-02
    EP0881425A3 (en) 2000-02-23

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