EP0602640B1 - Method and optical device for generating a directional beam of light for signalling or lighting purposes - Google Patents
Method and optical device for generating a directional beam of light for signalling or lighting purposes Download PDFInfo
- Publication number
- EP0602640B1 EP0602640B1 EP93120318A EP93120318A EP0602640B1 EP 0602640 B1 EP0602640 B1 EP 0602640B1 EP 93120318 A EP93120318 A EP 93120318A EP 93120318 A EP93120318 A EP 93120318A EP 0602640 B1 EP0602640 B1 EP 0602640B1
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- EP
- European Patent Office
- Prior art keywords
- light
- flush
- light according
- ribs
- fresnel principle
- 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
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Classifications
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- 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
- F21V5/00—Refractors for light sources
Definitions
- the invention relates to a device and a method for generating light that can be radiated from underfloor fires for signaling or lighting purposes, in particular in the airport area, with an optic with optically acting surfaces, such as reflectors and refractors, and optionally also filters, emitting a beam directed via an exit prism
- a light source e.g. a halogen lamp
- Signaling devices are known from aviation, but also from seafaring, in which a light source, e.g. a filament lamp revolves around a Fresnel lens system, which creates an annular light distribution.
- the light beam generated has a very uniform light intensity distribution and has only a slight widening.
- Another object of the invention is to design an optical system with an effect similar to that of a Fresnel lens plate in such a way that it can be inexpensively serial, e.g. by casting, can be produced and is particularly suitable for use in outdoor signaling devices.
- the main task is essentially solved in that in order to achieve a specified, preferably uniform, intensity distribution of the emitted light, this in a lamp reflector of a cross-sectional adjustment and then a correction by effects similar to the Fresnel principle, via ribs or smaller prisms with concave and is subjected to convexly alternating, optically interacting, sections on the ribs or the smaller prisms in such a way that the misdirections of light resulting from different light paths inside the device are corrected.
- the optical means used are advantageously designed as mini-optical means with a size in the millimeter range. Interference phenomena with their possibly adverse consequences for the color quality are also avoided.
- 1 and 2 denote two entry beams into a prism 3 with exit beams 4 and 5.
- the prism 3 has the mini-optical means according to the invention, which divide the unevenly fanned entry beams 1 and 2 ( ⁇ > ⁇ ) into approximately equally fanned exit beams ( ⁇ 1 ⁇ ⁇ 2).
- the non-uniformity of the entrance beams 1 and 2 results not only from the reflector 6, but also from the spatial distribution of the light generating element 7, e.g. the filament of a lamp.
- the mini-optical means 9 themselves, which are shown enlarged for clarity in the figures, are spatially curved (R2) and arranged according to the expansion of incidence and also distributed according to the expansion of incidence on a radius R1.
- the mini-optical means are thus arranged with three-dimensional influence (curvature in itself, arrangement on a curved center line and set against each other, especially V-shaped).
- FIG. 3 10 denotes the entrance side of the prism with the mini-optical means 11, which are drawn by straight outer edges for simplification. This results in a V-shaped wedge 12 in the middle, which in reality has curved sides.
- the individual mini-optical means 11 are set against one another in accordance with the radius R1.
- the configuration shown here is suitable for radiation in the normal radiation direction of the prism, for radiation at an angle to the side, e.g. for runways, an asymmetrical, one-sidedly deflected configuration is selected.
- FIG. 4 12 denotes the prism and 13 the means of the mini optics in a side view. As can be seen, the curvatures are partly concave and partly convex.
- FIG. 5 14 denotes a partial section of the prism and 15 the mini-optical means which are only indicated. 3 and 5, the spatial curvature corresponds to the radii R1 and R4 for the entirety of the mini-optical means, while the individual mini-optical means have the radii R2 and R3.
- the radii R5 and R6 shown in FIG. 6 are also important for the minioptical means.
- 16 denotes a partial section through the prism and 17 the side view of a mini-optical means.
- FIG. 7 denotes the outline of a mini-optical means, shown enlarged, which essentially consists of individual arcs with radii that merge into one another. This results in an advantageously infinitely variable light distribution despite the stepped arrangement of the mini-optical means.
- the size of the individual radii and the length of the arcs as well as the direction of the Connecting line 19 with a defined inclination with respect to the direction of radiation depends on the geometry of the light source used and the optical device in the lamp and is adapted to these specifications in each case.
- 20 denotes the lid of a lighting device in the airport area, e.g. of a taxiway light.
- 21 denotes the lower side of the housing on which the light source 22 is attached with a reflector.
- the light generated in the lamp 22 passes through a filter, which is optional, into the exit prism 23 with the mini-optical means 24 designed according to the invention and leaves the prism 23 in advantageously even distribution.
- FIG. 9 shows an embodiment of a device for illumination in the pedestrian area with the radiation angle 0 °. That in the light source 25, e.g. a known halogen lamp, generated light passes through lenses 27 and through a diaphragm 26 to the mirror 28, where it is reflected and through the prism 31, with mini-optical means according to the invention, not shown, leaves the top of the lamp.
- the top of the lamp is screwed to the housing 33 in a conventional manner in FIG. 29.
- the lenses and the diaphragm are arranged in a holding device 34. This acts as an optical bench, so that there is a common optical axis with the light source 25.
Description
Die Erfindung betrifft eine Einrichtung und ein Verfahren zur Erzeugung von aus Unterflurfeuern gerichtet abstrahlbarem Licht für Signal- oder Beleuchtungszwecke, insbesondere im Flughafenbereich, wobei durch eine Optik mit optisch wirkenden Flächen, wie Reflektoren und Refraktoren, gegebenenfalls auch Filtern, ein über ein Austrittsprisma gerichtet abgestrahlter Lichtstrahl aus einer Lichtquelle, z.B. einer Halogenlampe, im Inneren des Unterflurfeuers erzeugt wird.The invention relates to a device and a method for generating light that can be radiated from underfloor fires for signaling or lighting purposes, in particular in the airport area, with an optic with optically acting surfaces, such as reflectors and refractors, and optionally also filters, emitting a beam directed via an exit prism Light beam from a light source, e.g. a halogen lamp, is generated inside the underfloor light.
Aus der Luftfahrt, aber auch aus der Seefahrt sind Signaleinrichtungen bekannt, bei denen um eine Lichtquelle, z.B. eine Glühfadenlampe, ein Fresnel-Linsensystem umläuft, wodurch eine ringförmige Lichtverteilung erzeugt wird. Der erzeugte Lichtstrahl hat eine sehr gleichmäßige Lichtintensitätsverteilung und weist nur eine geringe Aufweitung auf.Signaling devices are known from aviation, but also from seafaring, in which a light source, e.g. a filament lamp revolves around a Fresnel lens system, which creates an annular light distribution. The light beam generated has a very uniform light intensity distribution and has only a slight widening.
Es ist Aufgabe der Erfindung, das oben beschriebene Fresnel-Prinzip in Abwandlung auch für kleine, mit festen Linsensystemen ausgerüstete Signal- oder Beleuchtungseinrichtungen, wie sie Unterflurfeuer darstellen, nutzbar zu machen.It is an object of the invention to make the Fresnel principle described above usable in a modification also for small signal or lighting devices equipped with fixed lens systems, as they represent underfloor lighting.
Kleine Fresnel-Linsen-Systeme mit feststehenden Optiken sind bereits aus der sogenannten binären Optik bekannt (Aufsatz: "Binary Optics", Scientific American May 1992). Die hier beschriebenen Fresnel-Linsenplatten sind jedoch aus Kosten- und Wirkungsgradgründen für technische Beleuchtungseinrichtungen wenig geeignet.Small Fresnel lens systems with fixed optics are already known from so-called binary optics (article: "Binary Optics", Scientific American May 1992). However, the Fresnel lens plates described here are not very suitable for technical lighting devices for reasons of cost and efficiency.
Aus der EP-A-0 198 088 ist weiterhin eine optische Einrichtung mit einer Oberfläche mit Fresnel-Linsen bekannt, die zu einer gleichmäßigen Lichtabstrahlung aus einer langgestreckten Lichtquelle führt. Zur Verwendung in Unterflurfeuern ist eine derartige Einrichtung nicht geeignet.From EP-A-0 198 088 an optical device with a surface with Fresnel lenses is also known, which leads to a uniform light emission from an elongated light source. Such a device is not suitable for use in underfloor lights.
Eine weitere Aufgabe der Erfindung besteht darin, eine Optik mit einer, einer Fresnel-Linsenplatte ähnlichen Wirkung, so auszubilden, daß sie kostengünstig serienmäßig, z.B. durch Gießen, herstellbar ist und dabei insbesondere für eine Verwendung in Signaleinrichtungen im Freien geeignet ist.Another object of the invention is to design an optical system with an effect similar to that of a Fresnel lens plate in such a way that it can be inexpensively serial, e.g. by casting, can be produced and is particularly suitable for use in outdoor signaling devices.
Die Hauptaufgabe wird im wesentlichen dadurch gelöst, daß zum Erreichen einer spezifizierten, vorzugsweise gleichmäßigen, Intensitätsverteilung des abgestrahlten Lichts, dieses in einem Lampenreflektor einer Querschnitts-Anpassung und dann einer Korrektur durch dem Fresnel-Prinzip-ähnliche Wirkungen, über Rippen oder kleinere Prismen mit konkav und konvex abwechselnden, optisch zusammenwirkenden, Abschnitten auf den Rippen oder den kleineren Prismen derart unterzogen wird, daß die sich durch unterschiedliche Lichtwege im Inneren der Einrichtung ergebenden Fehlrichtungen des Lichts korrigiert werden.The main task is essentially solved in that in order to achieve a specified, preferably uniform, intensity distribution of the emitted light, this in a lamp reflector of a cross-sectional adjustment and then a correction by effects similar to the Fresnel principle, via ribs or smaller prisms with concave and is subjected to convexly alternating, optically interacting, sections on the ribs or the smaller prisms in such a way that the misdirections of light resulting from different light paths inside the device are corrected.
Zur Lösung der Nebenaufgabe werden die verwendeten optischen Mittel vorteilhaft als minioptische Mittel mit einer Größe im Millimeterbereich ausgebildet. Dabei werden auch Interferenzphänomene mit ihren möglicherweise nachteiligen Folgen für die Farbqualität vermieden.To solve the secondary task, the optical means used are advantageously designed as mini-optical means with a size in the millimeter range. Interference phenomena with their possibly adverse consequences for the color quality are also avoided.
Weitere vorteilhafte Ausgestaltungen sind aus den Unteransprüchen entnehmbar, desgleichen die vorzugsweise vorgesehene Verwendung.Further advantageous embodiments can be found in the subclaims, as can the use which is preferably provided.
Die Erfindung wird in Zeichnungen näher erläutert, aus denen weitere, auch nur zeichnerisch dargestellte, erfinderische Einzelheiten entnehmbar sind, insbesondere in Verbindung mit den Unteransprüchen. Im einzelnen zeigen:
- FIG 1
- eine Erläuterung des Prinzips,
- FIG 2
- eine dreidimensionale Darstellung eines Abstrahlprismas mit lichteintrittsseitigen erfindungsgemäßen optischen Mitteln,
- FIG 3
- die Aufsicht auf eine erfindungsgemäße Lichteintrittsfläche,
- FIG 4
- einen Schnitt entsprechend den Linien A-A in FIG 3,
- FIG 5
- einen Schnitt entsprechend der Linie B-B in FIG 3 und
- FIG 6
- einen Schnitt entsprechend der Linie C-C in FIG 3,
- FIG 7
- eine vergrößerte Darstellung eines minioptischen Mittels,
- FIG 8
- eine in beispielhafter Form gezeigte Taxiway-Lampe im Schnitt sowie
- FIG 9
- eine Fußgängerbereichs-Beleuchtungseinrichtung mit abbildender Optik im Schnitt.
- FIG. 1
- an explanation of the principle,
- FIG 2
- 3 shows a three-dimensional representation of a radiation prism with optical means according to the invention on the light entry side,
- FIG 3
- the supervision of a light entry surface according to the invention,
- FIG 4
- 4 shows a section along lines AA in FIG. 3,
- FIG 5
- a section along the line BB in Figure 3 and
- FIG 6
- 4 shows a section along line CC in FIG. 3,
- FIG 7
- an enlarged view of a mini-optical means,
- FIG 8
- a taxiway lamp shown in exemplary form in section and
- FIG. 9
- a pedestrian area lighting device with imaging optics on average.
In FIG 1 bezeichnen 1 und 2 zwei Eintrittsstrahlen in ein Prisma 3 mit Austrittsstrahlen 4 und 5. Eintrittsseitig weist das Prisma 3 die erfindungsgemäßen minioptischen Mittel auf, die die ungleichmäßig aufgefächerten Eintrittsstrahlen 1 und 2 (α > β) in ungefähr gleich aufgefächerte Austrittsstrahlen (χ1 ≈ χ2) verwandeln. Die Ungleichmäßigkeit der Eintrittsstrahlen 1 und 2 ergibt sich dabei nicht nur durch den Reflektor 6, sondern auch durch die räumliche Verteilung des Lichterzeugungselementes 7, z.B. die Wendel einer Lampe.In FIG. 1, 1 and 2 denote two entry beams into a
In FIG 2 bezeichnet 8 ein Prisma mit den eintrittsseitig angeordneten Mitteln 9, die Fresnel-ähnlich wirken und erfindungsgemäß die Austrittsstrahlen 10 vergleichmäßigen (χL = χM = χR). Die minioptischen Mittel 9 selbst, die zur Verdeutlichung in den Figuren vergrößert dargestellt sind, sind räumlich, entsprechend der Einfallsaufweitung, gekrümmt (R2) und ebenfalls entsprechend der Einfallsaufweitung verteilt auf einem Radius R1 angeordnet. Die minioptischen Mittel sind also dreidimensional beeinflußt angeordnet (Krümmung in sich, Anordnung auf einer gekrümmten Mittellinie und Schränkung gegeneinander, insbesondere V-förmig).In FIG. 2, 8 denotes a prism with the
In FIG 3 bezeichnet 10 die Eintrittsseite des Prismas mit den minioptischen Mitteln 11, die zur Vereinfachung durch gestreckte Außenkanten gezeichnet sind. So ergibt sich in der Mitte ein V-förmiger Keil 12, der in der Realität gebogene Seiten aufweist. Die Schränkung der einzelnen minioptischen Mittel 11 gegeneinander erfolgt entsprechend dem Radius R1. Die hier gezeigte Konfiguration ist für eine Abstrahlung in Abstrahl-Normalrichtung des Prismas geeignet, zur Abstrahlung unter einem Winkel zur Seite, z.B. für Runways, wird eine asymmetrische, einseitig abgelenkt strahlende Konfiguration gewählt.In FIG. 3, 10 denotes the entrance side of the prism with the mini-optical means 11, which are drawn by straight outer edges for simplification. This results in a V-
In FIG 4 bezeichnet 12 das Prisma und 13 die Mittel der Minioptik in Seitenansicht. Wie ersichtlich sind die Krümmungen teils konkav und teils konvex.In FIG. 4, 12 denotes the prism and 13 the means of the mini optics in a side view. As can be seen, the curvatures are partly concave and partly convex.
In FIG 5 bezeichnet 14 einen Teilschnitt des Prismas und 15 die nur angedeuteten minioptischen Mittel. Aus der Zusammenschau der FIG 3 und 5 ergibt sich die räumliche Krümmung entsprechend der Radien R1 und R4 für die Gesamtheit der minioptischen Mittel, während die einzelnen minioptischen Mittel die Radien R2 und R3 aufweisen. Weiterhin für die minioptischen Mittel bedeutsam sind die Radien R5 und R6, die in FIG 6 gezeigt sind. In FIG 6 bezeichnet 16 einen Teilschnitt durch das Prisma und 17 die Seitenansicht eines minioptischen Mittels.In FIG. 5, 14 denotes a partial section of the prism and 15 the mini-optical means which are only indicated. 3 and 5, the spatial curvature corresponds to the radii R1 and R4 for the entirety of the mini-optical means, while the individual mini-optical means have the radii R2 and R3. The radii R5 and R6 shown in FIG. 6 are also important for the minioptical means. In FIG. 6, 16 denotes a partial section through the prism and 17 the side view of a mini-optical means.
In FIG 7 bezeichnet 18 die Umrisslinie eines vergrößert dargestellten minioptischen Mittels, die im wesentlichen aus einzelnen Kreisbögen mit in einander übergehenden Radien besteht. So ergibt sich eine vorteilhaft stufenlos wirkende Lichtverteilung trotz stufiger Anordnung der minioptischen Mittel. Die Größe der einzelnen Radien und die Länge der Kreisbögen sowie die Richtung der Verbindungslinie 19 mit definierter Neigung gegenüber der Abstrahlrichtung ist von der Geometrie der verwendeten Lichtquelle und der optischen Einrichtung in der Lampe abhängig und wird jeweils an diese Vorgaben angepaßt.In FIG. 7, 18 denotes the outline of a mini-optical means, shown enlarged, which essentially consists of individual arcs with radii that merge into one another. This results in an advantageously infinitely variable light distribution despite the stepped arrangement of the mini-optical means. The size of the individual radii and the length of the arcs as well as the direction of the
In FIG 8 bezeichnet 20 den Deckel einer Beleuchtungseinrichtung im Flughafenbereich, z.B. eines Taxiway-Lights. 21 bezeichnet die untere Gehäuseseite, auf der die Lichtquelle 22 mit Reflektor befestigt ist. Diese ist herkömmlicher Ausführung, ebenso ihre Anordnung in der Beleuchtungseinrichtung sowie die Beleuchtungseinrichtung selbst. Das in der Lampe 22 erzeugte Licht gelangt durch ein Filter, das optionell ist, in das Austrittsprisma 23 mit den minioptischen, erfindungsgemäß ausgestalteten Mitteln 24 und verläßt das Prisma 23 in vorteilhaft gleichmäßiger Verteilung.In FIG 8, 20 denotes the lid of a lighting device in the airport area, e.g. of a taxiway light. 21 denotes the lower side of the housing on which the
In FIG 9 ist eine Ausführung einer Einrichtung zur Illumination im Fußgängerbereich mit dem Abstrahlwinkel 0° gezeigt. Das in der Lichtquelle 25, z.B. eine bekannte Halogenlampe, erzeugte Licht gelangt über Linsen 27 und durch eine Blende 26 auf den Spiegel 28, wo es reflektiert wird und durch das Prisma 31, mit nicht näher gezeigten erfindungsgemäßen minioptischen Mitteln, die Oberseite der Leuchte verläßt. Die Oberseite der Leuchte ist in 29 mit dem Gehäuse 33 in üblicher Weise verschraubt. Die Linsen und die Blende sind in einer Haltevorrichtung 34 angeordnet. Diese wirkt als optische Bank, so daß sich eine gemeinsame optische Achse mit der Lichtquelle 25 ergibt.FIG. 9 shows an embodiment of a device for illumination in the pedestrian area with the radiation angle 0 °. That in the
Die beiden gezeigten Anwendungsbeispiele sind nur beispielhaft, es versteht sich, daß die erfindungsgemäße Idee und ihre Grundzüge universell einsetzbar sind, die Notwendigkeit ihres Einsatzes ist jedoch besonders bei Signaleinrichtungen im Luftfahrtbereich mit ihren besonderen Anforderungen gegeben.The two application examples shown are only examples; it is understood that the idea according to the invention and its basic features can be used universally, but the need for their use is particularly given in signaling devices in the aviation sector with their special requirements.
Claims (17)
- Method for generating light which can be radiated from flush lights for signal or lighting purposes, in particular in airports, whereby by means of an optical system with optically acting surfaces, such as reflectors and refractors, possibly also filters, a light beam radiated in a directional manner by way of an outlet prism (3, 8, 12) is generated from a light source, for example a halogen lamp (7), in the interior of the flush light, whereby to achieve a specified, preferably even distribution of intensity of the radiated light, the latter is subjected in a lamp reflector (6) to a cross-sectional adaptation and then to a correction by actions similar to the Fresnel principle, by way of ribs or smaller prisms (9, 11, 13, 15, 17) with alternately concave and convex, optically cooperating sections (18) on the ribs or the smaller prisms (9, 11, 13, 15, 17) in such a way that the misdirections of the light, resulting from different light paths in the interior of the device, are corrected.
- Method according to claim 1, characterized in that the correction according to the Fresnel principle takes place partially in lens sections (15, 17) which are preferably asymmetrically distributed and are similar to stairs, the size of which sections lies in the millimetre range (mini-optics).
- Flush light having at least one light outlet prism to carry out the method according to claim 1 or 2, characterized in that it has means, which are subject to error when operating, for light-outlet cross-sectional distribution and radiation alignment in the form of reflectors, refractors and/or lenses and means connected to the light outlet prism (3, 8, 12), in the form of ribs or smaller prisms (9, 11, 13, 15, 17) with alternately concave and convex, optically cooperating sections on the ribs or the smaller prisms (9, 11, 13, 15, 17), for the correction of the errors which have occurred by way of the means for distribution and beam alignment, which former means in each case operate similarly to the Fresnel principle.
- Flush light according to claim 3, characterized in that the means operating similarly to the Fresnel principle are lens or prism sections (9, 11) constructed at least in part like stairs and having asymmetrical profiles and preferably symmetrical spatial distribution.
- Flush light according to claim 3 or 4, characterized in that the means operating similarly to the Fresnel principle are of a size which lies in the millimetre region.
- Flush light according to claim 3, 4 or 5, characterized in that the means (9, 11) which are preferably constructed like stairs and operate similarly to the Fresnel principle are constructed in the form of ribs and are preferably arranged centrally symmetrically.
- Flush light according to claims 3, 4, 5 or 6, characterized in that the means (9, 11) operating similarly to the Fresnel principle are arranged in stair-like construction, individually among themselves or in sections which extend inclined towards each other in a V-shape.
- Flush light according to claims 3, 4, 5, 6 or 7, characterized in that the means (9, 11) operating similarly to the Fresnel principle are constructed bent in stair-like construction (13, 15, 17), in the shape of a curve, in particular in a circular manner.
- Flush light according to claims 3, 4, 5, 6, 7 or 8, characterized in that the means (9, 11) operating similarly to the Fresnel principle are arranged in stair-like construction on a curved, in particular circular, centre line.
- Flush light according to claims 3, 4, 5, 6, 7, 8 or 9, characterized in that the means (9, 11) constructed in stair-like manner and operating similarly to the Fresnel principle are constructed as inlet-side ribs or prisms (9, 11) which have transition radii among them.
- Flush light according to claim 10, characterized in that the height (size) of the inlet ribs (9, 11) lies between 0.5 and 6 mm, preferably in the region greater than 1.5 mm.
- Flush light according to claim 10 or 11, characterized in that the spacing between the inlet ribs (9, 11) lies between 1 and 10 mm, in particular in the region of 2.5 mm.
- Flush light according to claim 10, 11 or 12, characterized in that the transition radii between the inlet ribs (9, 11) lie in the region of 0.1 and 0.5 mm, in particular in the region of 0.3 mm.
- Flush light according to one or more of the preceding claims, characterized in that it is used to radiate light with radiation sub-regions which are defined by the radiation width and preferably have the same direction.
- Flush light according to one or more of the preceding claims, characterized in that it is used to illuminate the surfaces of buildings, pedestrian areas, streets etc.
- Flush light according to one or more of the preceding claims 1 to 15, characterized in that it is used in connection with an imaging optical system, in particular in the interior of buildings.
- Flush light according to one or more of the preceding claims, characterized in that it is used in particular to generate linear and rectangular even distributions of light.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4243109 | 1992-12-18 | ||
| DE4243109 | 1992-12-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0602640A1 EP0602640A1 (en) | 1994-06-22 |
| EP0602640B1 true EP0602640B1 (en) | 1997-07-30 |
Family
ID=6475852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93120318A Expired - Lifetime EP0602640B1 (en) | 1992-12-18 | 1993-12-16 | Method and optical device for generating a directional beam of light for signalling or lighting purposes |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0602640B1 (en) |
| DE (1) | DE59307013D1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2329557A (en) * | 1941-01-11 | 1943-09-14 | Holophane Co Inc | Luminaire |
| US3154254A (en) * | 1959-01-02 | 1964-10-27 | Holophane Co Inc | Street light refractor |
| US3253255A (en) * | 1962-07-24 | 1966-05-24 | Elastic Stop Nut Corp | Signal lamp and focusing reflector |
| FR2116758A5 (en) * | 1970-12-07 | 1972-07-21 | Tissmetal Lionel Dupont | |
| JPH0129928Y2 (en) * | 1984-09-29 | 1989-09-12 |
-
1993
- 1993-12-16 DE DE59307013T patent/DE59307013D1/en not_active Expired - Fee Related
- 1993-12-16 EP EP93120318A patent/EP0602640B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59307013D1 (en) | 1997-09-04 |
| EP0602640A1 (en) | 1994-06-22 |
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