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EP0012430B1 - Device for reducing the reflection of light in traffic lights, caused by external light sources - Google Patents
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EP0012430B1 - Device for reducing the reflection of light in traffic lights, caused by external light sources - Google Patents

Device for reducing the reflection of light in traffic lights, caused by external light sources Download PDF

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Publication number
EP0012430B1
EP0012430B1 EP79105112A EP79105112A EP0012430B1 EP 0012430 B1 EP0012430 B1 EP 0012430B1 EP 79105112 A EP79105112 A EP 79105112A EP 79105112 A EP79105112 A EP 79105112A EP 0012430 B1 EP0012430 B1 EP 0012430B1
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EP
European Patent Office
Prior art keywords
light
slats
laminae
external light
light source
Prior art date
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EP79105112A
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German (de)
French (fr)
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EP0012430A1 (en
Inventor
Achim Dr. Willing
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AUER-SOG Glaswerke GmbH
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AUER-SOG Glaswerke GmbH
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Application filed by AUER-SOG Glaswerke GmbH filed Critical AUER-SOG Glaswerke GmbH
Priority to AT79105112T priority Critical patent/ATE3082T1/en
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    • GPHYSICS
    • G08SIGNALLING
    • G08GTRAFFIC CONTROL SYSTEMS
    • G08G1/00Traffic control systems for road vehicles
    • G08G1/09Arrangements for giving variable traffic instructions
    • G08G1/095Traffic lights
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2111/02Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for roads, paths or the like

Definitions

  • the invention relates to a device for reducing the light reflection caused by external extraneous light on traffic lights, consisting of a plurality of lamellae which are set up to absorb the external external light which is inclined on their upper side and are arranged in front of the light source in parallel with one another and at a distance.
  • the space in front of the installed traffic light which is usually located above eye level, can be subdivided into a lower observer half-space, in which the signal light must be visible, and an upper half-light space, from which the disturbing extraneous light comes in.
  • these two half-spaces may overlap somewhat, they can normally be regarded as separated by a plane that extends horizontally through the traffic light. Because of these conditions, shielding from interfering external light can be achieved in a known manner by a chute, that is to say a roof located above the traffic light.
  • a chute that is to say a roof located above the traffic light.
  • such a barge must have a very large overall length. It also makes it difficult to look at the signal from the side.
  • the lamella surface is black, for. B. colored black.
  • the light-absorbing slats are also able to effectively suppress incident external light if the slats are arranged one above the other with correspondingly small distances and / or have a correspondingly large width in the direction of the axis of the light beam optics.
  • the suppression of phantom light by the slats occurs at the expense of signaling, since the slats swallow an increasing proportion of the signal light with increasing width and density.
  • the reduced signal light yield is a decisive disadvantage of the known slat design.
  • a prerequisite for the proper function of the traffic light is that the signal can be clearly ascertained.
  • H. the flashing color There must be a signal light intensity or luminance, which is limited at the bottom by a minimum conspicuity and at the top by the risk of glare in a dark environment.
  • the energy consumption for the signal light should be as low as possible for economic reasons.
  • the invention has for its object to improve the known device so that a higher yield of signal light is achieved with it while maintaining the good suppression of extraneous light.
  • This object is achieved in that the upper sides of the slats facing the external light source are designed to be highly light-absorbing, while the undersides of the slats are designed to be highly light-reflecting.
  • the external light incident from the so-called upper half-light space strikes the upper sides of the slats and is largely made harmless by the absorption taking place there, so that the risk of phantom light is largely eliminated.
  • the usable signal light that emanates from the light source is not only limited to that part of the light that emerges directly through the spaces between adjacent slats without striking them; rather, the signal light component that falls on the undersides of the slats is also used by being reflected downwards into the so-called observer half-space with a corresponding downward component. This signal light component compensates for the loss of the signal light that strikes the top of the slats and is absorbed there.
  • the arrangement of the slats does not significantly weaken the usable luminous flux compared to a luminaire without slats, which practical tests have confirmed.
  • the invention succeeds in easily reconciling the requirements for good phantom light suppression and high signal light yield.
  • the slats are made as thin as possible so that the signal light can exit largely unhindered. Their absorption effect can be achieved with a matt black coating on the top of the slats.
  • the slats do not have to be aligned one above the other, but can be offset from one another to increase the absorption effect.
  • the slats are expediently aligned parallel to the signal light beams that are still in use, and which most closely approach the ambient light half space leads to parallel or horizontal alignment of the slats in functionally arranged traffic lights.
  • the slats are usually flat, which is easiest to achieve from a manufacturing point of view.
  • curved shapes according to claims 5 and 6 can be advantageous in special cases, in particular if there are difficult conditions with regard to the incidence of extraneous light and the observer half-space can be narrowed.
  • a parallel light beam 1 falls on the signal lamp, of which only the front lens 2 is shown schematically for the sake of clarity.
  • four mutually parallel slats 3 are arranged one above the other. Each of these slats 3 has a highly absorbent upper side 4, which faces the light from the external light source, and a highly reflective lower side 5, which faces away from the incident light from the external light source.
  • the individual slats 3 have the depth t and are arranged equidistantly with the distance a from one another.
  • the plane of the flat slats 3 includes an angle ⁇ with the direction of incidence of the light bundle 1 of the external light source.
  • the space in front of the signal lamp can be divided into two half-spaces, the upper half-space forming the stray light half-space 6 and the lower half-space the observer half-space 7.
  • the central plane 8 between the two half-spaces 6, 7 runs through the center 9 of the signal lamp, in the example of a traffic light parallel to the floor.
  • the rays of the light bundle 1 of the external light source are absorbed on the absorbent upper side 4 of the slats 3, while the rays S 1 , S 2 , S 3 from the light source 9 of the signal light either directly into this Leave in the direction of the observer half-space 7 (eg S 2 ) or are first reflected on the reflecting underside 5 of the lamella 3 and then also exit into the observer half-space 7 (eg Si). Rays from the light source 9, which impinge on the upper side 4 of a lamella 3 (eg S 3 ), are absorbed. They would not be essential for the signal effect even in the case of reflection in the interfering light half space 6.
  • each light beam P incident from the external light source at the angle of incidence ⁇ is first scattered on the outer lens 2, so that a bundle is formed, the origin of which is a point 10 of the lens 2.
  • the largest part P 2 of this bundle in turn falls on the absorbent upper sides 4 of the slats 3, while only a relatively small part P 1 falls on the reflector.
  • the rays S 1 , S 2 , S 3 emanating from the only schematically indicated light source 11 are in turn either reflected from the undersides 5 of the slats 3 onto the diffusing screen 2 (S 1 ), reach them directly (S 2 ) or are emitted from the tops 4 of the slats 3 absorbed (S 3 ).
  • a point 12 of the lens 2 in turn forms the starting point for a beam P 3 for the beams S 1 , S 2 , which is scattered into the outside space.
  • the reflecting underside 5 has a corrugated-cylindrical structure for the lateral scattering of the light falling on the reflecting surfaces.
  • This reflective layer 13 may e.g. B. be an aluminum layer.
  • the reflective layer 14 can be made of aluminum.
  • the reflecting surface on the underside 5 is a diffusely scattering, e.g. B. frosted layer 15 is formed.
  • the material can also be aluminum, matt on one side.
  • FIG. 13 and 14 show slats 3 which are curved in the longitudinal direction of the slats or along their longitudinal axis 16.
  • the housing of the signal lamp is designated by 18, and the curvature of the lamella can be seen at 16.
  • the lamellae 3 provided with bearing pins 20 lie in bores in a bearing frame 21 which is fastened to the housing by means of rivets 22.
  • a threaded spindle 24 which extends through the housing 18 through a nut 23 and which, passing through an opening 26 in the lamella 3, engages via stops 25 on the lamellae, the lamellae can be adjusted by the operating personnel of the signal light.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

On a light signal, for example a traffic signal, to reduce the parasite reflections of an external light source (for example the sun), a series of parallel, superposed lamellae are arranged between the light source and the dispersion glass (2). At least a portion of the upper surface (4) of these lamellae particularly more exposed to the external light source is highly light absorbing, whereas the other surface (5) is preferably highly reflecting. Conveniently, the position of the lamellae (3) is adjustable.

Description

Die Erfindung betrifft eine Vorrichtung zum Vermindern der von äußerem Fremdlicht verursachten Lichtreflexion an Verkehrsleuchten, bestehend aus mehreren Lamellen, die zur Absorption des auf ihre Oberseite geneigt auftreffenden äußeren Fremdlichts eingerichtet sind und vor der Lichtquelle parallel zueinander sowie im Abstand angeordnet werden.The invention relates to a device for reducing the light reflection caused by external extraneous light on traffic lights, consisting of a plurality of lamellae which are set up to absorb the external external light which is inclined on their upper side and are arranged in front of the light source in parallel with one another and at a distance.

Bei Verkehrsleuchten muß der Entstehung sogenannten »Phantomlichts« durch äußeres Fremdlicht, das von außen in die Verkehrsleuchte eindringt und von der Verkehrsleuchte reflektiert wird, begegnet werde. Derart reflektiertes Fremdlicht, das beispielsweise von der tiefstehenden Sonne ausgehen kann, kann nämlich mit einem echten Signal der Verkehrsleuchte verwechselt werden, was schlimme Folgen haben kann.In traffic lights, the emergence of so-called "phantom lights" must be counteracted by external light that penetrates into the traffic light from outside and is reflected by the traffic light. External light reflected in this way, which may emanate from the low-lying sun, for example, can be confused with a real signal from the traffic light, which can have serious consequences.

Der Raum vor der installierten Verkehrsleuchte, die üblicherweise oberhalb der Augenhöhe angeordnet ist, kann in einen unteren Beobachterhalbraum, in dem das Signallicht zu erkennen sein muß, und in einen oberen Störlichthalbraum unterteilt werden, aus dem das störende Fremdlicht ein einfällt. Diese beiden Halbräume können sich zwar ggf. etwas überschneiden, können jedoch für den Normalfall als durch eine sich waagerecht durch die Verkehrsleuchte erstreckende Ebene getrennt angesehen werden. Wegen dieser Verhältnisse kann eine Abschirmung störenden Fremdlichts in bekannter Weise durch eine Schute, also ein über der Verkehrsleuchte befindliches Dach, erreicht werden. Eine solche Schute muß aber, um bei flachen Einfallwinkel wirksam zu sein, eine sehr große Baulänge aufweisen. Außerdem erschwert sie den seitlichen Blick auf das Signal.The space in front of the installed traffic light, which is usually located above eye level, can be subdivided into a lower observer half-space, in which the signal light must be visible, and an upper half-light space, from which the disturbing extraneous light comes in. Although these two half-spaces may overlap somewhat, they can normally be regarded as separated by a plane that extends horizontally through the traffic light. Because of these conditions, shielding from interfering external light can be achieved in a known manner by a chute, that is to say a roof located above the traffic light. However, in order to be effective at a flat angle of incidence, such a barge must have a very large overall length. It also makes it difficult to look at the signal from the side.

Bei einer bekannten Vorrichtung der eingangs angegebenen Art (DE-U-1 863 517) ist die Lamellenoberfläche schwarz ausgebildet, z. B. schwarz gefärbt.In a known device of the type mentioned (DE-U-1 863 517), the lamella surface is black, for. B. colored black.

Die lichtabsorbierenden Lamellen vermögen auch flach einfallendes Fremdlicht noch wirksam zu unterdrücken, falls die Lamellen mit entsprechend kleinen Abständen übereinander angeordnet und/oder eine entsprechend große Breite in Richtung der Achse der Lichtbündeloptik aufweisen. Die Unterdrückung von Phantomlicht durch die Lamellen geschieht jedoch auf Kosten der Signalgabe, da die Lamellen mit zunehmender Breite und Dichte auch einen steigenden Anteil des Signallichts schlucken. Die verminderte Signallichtausbeute ist ein entscheidender Nachteil der bekannten Lamellenausführung. Voraussetzung für eine einwandfreie Funktion der Verkehrsleuchte ist die eindeutige Feststellbarkeit des Signals, d. h. der aufleuchtenden Farbe. Es muß eine Signallichtstärke bzw. Leuchtdichte vorhanden sein, die nach unten durch eine Mindestauffälligkeit und nach oben durch die Gefahr einer Blendung bei dunkler Umgebung begrenzt ist. Dabei soll der Energieverbrauch für das Signallicht aus wirtschaftlichen Erwägungen möglichst gering sein.The light-absorbing slats are also able to effectively suppress incident external light if the slats are arranged one above the other with correspondingly small distances and / or have a correspondingly large width in the direction of the axis of the light beam optics. However, the suppression of phantom light by the slats occurs at the expense of signaling, since the slats swallow an increasing proportion of the signal light with increasing width and density. The reduced signal light yield is a decisive disadvantage of the known slat design. A prerequisite for the proper function of the traffic light is that the signal can be clearly ascertained. H. the flashing color. There must be a signal light intensity or luminance, which is limited at the bottom by a minimum conspicuity and at the top by the risk of glare in a dark environment. The energy consumption for the signal light should be as low as possible for economic reasons.

Dementsprechend liegt der Erfindung die Aufgabe zugrunde, die bekannte Vorrichtung so zu verbessern, daß mit ihr unter Beibehaltung der guten Fremdlichtunterdrückung eine höhere Ausbeute an Signallicht erzielt wird.Accordingly, the invention has for its object to improve the known device so that a higher yield of signal light is achieved with it while maintaining the good suppression of extraneous light.

Diese Aufgabe wird dadurch gelöst, daß die der Fremdlichtquelle zugewendeten Oberseiten der Lamellen stark lichtabsorbierend, die Unterseiten der Lamellen dagegen stark lichtreflektierend ausgeführt sind.This object is achieved in that the upper sides of the slats facing the external light source are designed to be highly light-absorbing, while the undersides of the slats are designed to be highly light-reflecting.

Bei der erfindungsgemäß ausgebildeten Vorrichtung trifft das aus dem sogenannten oberen Störlichthalbraum einfallende Fremdlicht auf die Oberseiten der Lamellen auf und wird durch die dort erfolgenden Absorption weitgehend unschädlich gemacht, so daß die Gefahr von Phantomlicht weitgehend gebannt ist. Andererseits beschränkt sich das nutzbare Signallicht, das von der Lichtquelle ausgeht, nicht nur auf denjenigen Lichtanteil, der direkt durch die Zwischenräume zwischen benachbarten Lamellen austritt, ohne auf diese aufzutreffen; vielmehr wird auch noch derjenige Signallichtanteil genutzt, der auf die Unterseiten der Lamellen fällt, indem er mit einer entsprechend abwärts gerichteten Komponente nach unten in den sogenannten Beobachterhalbraum reflektiert wird. Dieser Signallichtanteil bildet einen Ausgleich für den Verlust desjenigen Signallichts, das auf die Lamellenoberseiten auftrifft und dort absorbiert wird. Daher wird durch die Anordnung der Lamellen der nutzbare Signallichtstrom im Vergleich zu einer Leuchte ohne Lamellen nicht wesentlich geschwächt, was praktische Versuche bestätigt haben. Der gelingt es mit der Erfindung, die Forderungen nach guter Phantomlichtunterdrückung und nach hoher Signallichtausbeute auf einfache Weise miteinander in Einklang zu bringen.In the device designed according to the invention, the external light incident from the so-called upper half-light space strikes the upper sides of the slats and is largely made harmless by the absorption taking place there, so that the risk of phantom light is largely eliminated. On the other hand, the usable signal light that emanates from the light source is not only limited to that part of the light that emerges directly through the spaces between adjacent slats without striking them; rather, the signal light component that falls on the undersides of the slats is also used by being reflected downwards into the so-called observer half-space with a corresponding downward component. This signal light component compensates for the loss of the signal light that strikes the top of the slats and is absorbed there. Therefore, the arrangement of the slats does not significantly weaken the usable luminous flux compared to a luminaire without slats, which practical tests have confirmed. The invention succeeds in easily reconciling the requirements for good phantom light suppression and high signal light yield.

Es ist zweckmäßig, die Unterseiten der Lamellen spiegelnd auszubilden. Eine Reflexion durch Spiegelung läßt sich durch einen entsprechenden Metallüberzug leicht erreichen. Außerdem können die Lamellen ohne ins Gewicht fallenden Aufwand auch zur Erzielung einer optimalen Signallichtverteilung herangezogen werden. Hierzu dienen die in den Ansprüchen 3 und 4 angegebenen Maßnahmen.It is advisable to make the undersides of the slats reflective. A reflection by mirroring can be easily achieved with an appropriate metal coating. In addition, the slats can also be used to achieve an optimal signal light distribution without significant effort. The measures specified in claims 3 and 4 serve for this purpose.

Die Lamellen werden möglichst dünn ausgebildet, damit das Signallicht weitgehend ungehindert austreten kann. Ihre Absorptionswirkung kann durch einen matt schwarzen Anstrich der Lamellenoberseiten erreicht werden. Die Lamellen müssen nicht fluchtend übereinander angeordnet sein, sondern können zueinander versetzt sein, um die Absorptionswirkung zu erhöhen. Dabei sind die Lamellen zweckmäßigerweise parallel zu den noch genutzten Signallichtstrahlen ausgerichtet, die sich dem Störlichthalbraum am stärksten annähern, was zur bodenparallelen bzw. waagerechten Ausrichtung der Lamellen bei funktionsgerecht angeordneten Verkehrsleuchten führt.The slats are made as thin as possible so that the signal light can exit largely unhindered. Their absorption effect can be achieved with a matt black coating on the top of the slats. The slats do not have to be aligned one above the other, but can be offset from one another to increase the absorption effect. The slats are expediently aligned parallel to the signal light beams that are still in use, and which most closely approach the ambient light half space leads to parallel or horizontal alignment of the slats in functionally arranged traffic lights.

Die Lamellen sind normalerweise eben ausgeführt, was herstellungstechnisch am einfachsten zu verwirklichen ist. Jedoch können gekrümmte Formen gemäß den Ansprüchen 5 und 6 in besonderen Fällen von Vorteil sein, insbesondere wenn schwierige Verhältnisse bezüglich des Fremdlichteinfalls gegeben sind und der Beobachterhalbraum eingeengt werden kann.The slats are usually flat, which is easiest to achieve from a manufacturing point of view. However, curved shapes according to claims 5 and 6 can be advantageous in special cases, in particular if there are difficult conditions with regard to the incidence of extraneous light and the observer half-space can be narrowed.

Einzelheiten und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung einiger bevorzugter Ausführungsformen sowie anhand der Zeichnung. Dabei zeigenDetails and advantages of the invention will become apparent from the following description of some preferred embodiments and from the drawing. Show

  • Fig. 1 eine schematische Darstellung einer Verkehrsleuchte mit der Lamellen aufweisenden erfindungsgemäßen Vorrichtung unter Veranschaulichung ihrer Wirkung auf einfallendes und austretendes Licht,1 is a schematic illustration of a traffic light with the device according to the invention having lamellae, illustrating its effect on incident and emerging light,
  • Fig. 2 eine Fig. 1 ähnliche Darstellung mit einer Streuscheibe unter Veranschaulichung der Streuscheibenwirkung auf einfallendes und austretendes Licht,2 shows a representation similar to FIG. 1 with a diffusing screen, illustrating the effect of the diffusing screen on incident and emerging light,
  • Fig. 3 eine Seitenansicht einer besonderen Ausführungsform einer Lamelle,3 shows a side view of a particular embodiment of a lamella,
  • Fig.4 die Ansicht eines Teils der Lamelle gemäß Pfeil IV in Fig. 3,4 shows the view of part of the lamella according to arrow IV in FIG. 3,
  • Fig. 5 die Ansicht eines Teils der Lamelle gemäß Pfeil V in Fig. 3,5 shows the view of part of the lamella according to arrow V in FIG. 3,
  • Fig. 6 eine Seitenansicht einer anderen Ausführungsform einer Lamelle,6 is a side view of another embodiment of a lamella,
  • Fig.7 die Ansicht eines Teils der Lamelle gemäß Pfeil VII in Fig. 6,7 shows the view of part of the lamella according to arrow VII in FIG. 6,
  • Fig. die Ansicht eines Teils der Lamelle gemäß Pfeil VIII in Fig. 6,6 shows the view of part of the lamella according to arrow VIII in FIG. 6,
  • Fig. 9 eine Seitenansicht einer weiteren Ausführungsform einer Lamelle,9 is a side view of a further embodiment of a lamella,
  • Fig. 10 eine Seitenansicht einer um ihre Längsachse gekrümmten Lamelle,10 is a side view of a lamella curved about its longitudinal axis,
  • Fig. 11 die Ansicht eines Teils der Lamelle gemäß Pfeil XI in Fig. 10,11 is a view of part of the lamella according to arrow XI in FIG. 10,
  • Fig. 12 die Ansicht eines Teils der Lamelle gemäß Pfeil XII in Fig. 10,12 is a view of part of the slat according to arrow XII in Fig. 10,
  • Fig. 13 die schematische Ansicht von vorn auf eine Vorrichtung mit jeweils längs ihrer Längsachse gekrümmten Lamellen,13 shows the schematic view from the front of a device with lamellae each curved along its longitudinal axis,
  • Fig. 14 die Draufsicht auf eine Lamelle gemäß Linie XIV-XIV in Fig. 13,14 the top view of a lamella according to line XIV-XIV in FIG. 13,
  • Fig. 15 teilweise im Schnitt einen Teil einer Vorrichtung zur Veränderung der Ausrichtung der Lamellen,15 partially in section a part of a device for changing the orientation of the slats,
  • Fig. 16 die Schnittansicht nach Linie XVI-XVI in Fig. 15,16 shows the sectional view along line XVI-XVI in FIG. 15,
  • Fig. 17 die Schnittansicht nach Linie XVII-XVII in Fig. 16,17 shows the sectional view along line XVII-XVII in FIG. 16,
  • Fig. 18 die Teilansicht von vorn auf Lamellen, deren Ausrichtung veränderbar ist, undFig. 18 is a partial front view of slats, the orientation of which can be changed, and
  • Fig. 19 die Schnittansicht gemäß Linie XIX-XIX in Fig. 18.19 shows the sectional view along line XIX-XIX in FIG. 18.

Gemäß Fig. 1 fällt unter der Annahme, daß die externe Lichtquelle verhältnismäßig weit von der Signalleuchte ist, ein Parallellichtbündel 1 auf die Signalleuchte, von der der Übersichtlichkeit halber nur die vordere Streuscheibe 2 schematisch dargestellt ist. Vor der Streuscheibe sind vier zueinander parallele Lamellen 3 übereinander angeordnet. Jede dieser Lamellen 3 weist eine stark absorbierende Oberseite 4 auf, die dem Licht der externen Lichtquelle zugewandt ist, und eine stark reflektierende Unterseite 5, die dem einfallenden Licht der externen Lichtquelle abgewandt ist.1, assuming that the external light source is relatively far from the signal lamp, a parallel light beam 1 falls on the signal lamp, of which only the front lens 2 is shown schematically for the sake of clarity. In front of the spreading disc, four mutually parallel slats 3 are arranged one above the other. Each of these slats 3 has a highly absorbent upper side 4, which faces the light from the external light source, and a highly reflective lower side 5, which faces away from the incident light from the external light source.

Die einzelnen Lamellen 3 besitzen die Tiefe t und sind äquidistant mit dem Abstand a zueinander angeordnet. Die Ebene der flach ausgebildeten Lamellen 3 schließt mit der Einfallsrichtung des Lichtbündels 1 der externen Lichtquelle einen Winkel ϕ ein.The individual slats 3 have the depth t and are arranged equidistantly with the distance a from one another. The plane of the flat slats 3 includes an angle ϕ with the direction of incidence of the light bundle 1 of the external light source.

Der Raum vor der Signalleuchte läßt sich in zwei Halbräume einteilen, wobei der obere Halbraum den Störlichthalbraum 6 und der untere Halbraum den Beobachterhalbraum 7 bildet. Die Mittelebene 8 zwischen beiden Halbräumen 6, 7 verläuft durch das Zentrum 9 der Signalleuchte, im Beispiel einer Verkehrsampel parallel zum Boden.The space in front of the signal lamp can be divided into two half-spaces, the upper half-space forming the stray light half-space 6 and the lower half-space the observer half-space 7. The central plane 8 between the two half-spaces 6, 7 runs through the center 9 of the signal lamp, in the example of a traffic light parallel to the floor.

Wie aus Fig. 1 deutlich zu erkennen ist, werden die Strahlen des Lichtbündels 1 der externen Lichtquelle auf der absorbierenden Oberseite 4 der Lamellen 3 absorbiert, während die Strahlen S1, S2, S3 aus der Lichtquelle 9 der Signalleuchte diese entweder direkt in Richtung Beobachterhalbraum 7 verlassen (z. B. S2) oder an der reflektierenden Unterseite 5 der Lamelle 3 zunächst reflektiert werden und dann ebenfalls in den Beobachterhalbraum 7 austreten (z. B. Si). Strahlen der Lichtquelle 9, die auf die Oberseite 4 einer Lamelle 3 auftreffen (z. B. S3), werden absorbiert. Sie würden auch im Falle der Reflexion in den Störlichthalbraum 6 für die Signalwirkung nicht wesentlich sein.As can be clearly seen from FIG. 1, the rays of the light bundle 1 of the external light source are absorbed on the absorbent upper side 4 of the slats 3, while the rays S 1 , S 2 , S 3 from the light source 9 of the signal light either directly into this Leave in the direction of the observer half-space 7 (eg S 2 ) or are first reflected on the reflecting underside 5 of the lamella 3 and then also exit into the observer half-space 7 (eg Si). Rays from the light source 9, which impinge on the upper side 4 of a lamella 3 (eg S 3 ), are absorbed. They would not be essential for the signal effect even in the case of reflection in the interfering light half space 6.

Gemäß Fig. 2 wird jeder von der externen Lichtquelle unter dem Einfallswinkel ϕ einfallende Lichtstrahl P zunächst an der äußeren Streuscheibe 2 gestreut, so daß ein Bündel entsteht, dessen Ursprung ein Punkt 10 der Streuscheibe 2 ist. Der größte Teil P2 dieses Bündels fällt wiederum auf die absorbierenden Oberseiten 4 der Lamellen 3, während nur ein verhältnismäßig geringer Teil P1 auf den Reflektor fällt. Die von der nur schematisch angedeuteten Lichtquelle 11 ausgehenden Strahlen S1, S2, S3 werden wiederum entweder von den Unterseiten 5 der Lamellen 3 auf die Streuscheibe 2 reflektiert (S1), erreichen diese direkt (S2) oder werden von den Oberseiten 4 der Lamellen 3 absorbiert (S3). Ein Punkt 12 der Streuscheibe 2 bildet für die Strahlen S1, S2 wiederum den Ausgangspunkt für ein Strahlenbündel P3, das in den Außenraum gestreut wird.According to FIG. 2, each light beam P incident from the external light source at the angle of incidence ϕ is first scattered on the outer lens 2, so that a bundle is formed, the origin of which is a point 10 of the lens 2. The largest part P 2 of this bundle in turn falls on the absorbent upper sides 4 of the slats 3, while only a relatively small part P 1 falls on the reflector. The rays S 1 , S 2 , S 3 emanating from the only schematically indicated light source 11 are in turn either reflected from the undersides 5 of the slats 3 onto the diffusing screen 2 (S 1 ), reach them directly (S 2 ) or are emitted from the tops 4 of the slats 3 absorbed (S 3 ). A point 12 of the lens 2 in turn forms the starting point for a beam P 3 for the beams S 1 , S 2 , which is scattered into the outside space.

Bei der in den Fig. 3, 4 und 5 dargestellten Ausführungsform einer Lamelle weist die reflektierende Unterseite 5 eine gewellt-zylindrische Struktur zur seitlichen Streuung des auf die spiegelnd ausgebildeten Flächen fallenden Lichts auf. Diese reflektierende Schicht 13 kann z. B. eine Aluminiumschicht sein.In the embodiment of a lamella shown in FIGS. 3, 4 and 5, the reflecting underside 5 has a corrugated-cylindrical structure for the lateral scattering of the light falling on the reflecting surfaces. This reflective layer 13 may e.g. B. be an aluminum layer.

Die Fig. 6, 7 und 8 zeigen eine weitere Ausführungsform einer Lamelle 3, bei welcher mittels sägezahnartiger Querriefen 14 eine Tiefenstreuung des Signallichtes bewirkt wird. Auch hier kann die reflektierende Schicht 14 aus Aluminium bestehen.6, 7 and 8 show a further embodiment of a lamella 3, in which a deep scattering of the signal light is effected by means of sawtooth-like transverse grooves 14. Here too, the reflective layer 14 can be made of aluminum.

Bei der in Fig. 9 dargestellten Ausführungsform einer Lamelle ist die reflektierende Fläche an der Unterseite 5 als diffus streuende, z. B. mattierte Schicht 15 ausgebildet. Hier erfolgt also eine diffuse Streuung des auftreffenden Lichts in alle Beobachtungsrichtungen. Das Material kann in diesem Falle ebenfalls Aluminium, einseitig mattiert, sein.In the embodiment of a lamella shown in FIG. 9, the reflecting surface on the underside 5 is a diffusely scattering, e.g. B. frosted layer 15 is formed. Here there is a diffuse scattering of the incident light in all directions of observation. In this case, the material can also be aluminum, matt on one side.

Die Fig. 10, 11 und 12 zeigen eine in Lamellenquerrichtung um ihre Längsachse 16 gekrümmte Lamelle 3; die Krümmung ist bei 17 angedeutet. Mit dieser Ausführungsform wird erreicht, daß möglichst viel Licht in den Nahbereich der Signalleuchte gelenkt wird; d. h., es ergibt sich eine starke Tiefenstreuung im Vergleich zu dem Ausführungsbeispiel gemäß den Fig. 6, und 8, aber auch mehr Schutz gegen Störlicht.10, 11 and 12 show a lamella 3 curved in the transverse direction of the lamellae about its longitudinal axis 16; the curvature is indicated at 17. This embodiment ensures that as much light as possible is directed into the vicinity of the signal lamp; d. that is, there is a strong depth scatter compared to the embodiment according to FIGS. 6 and 8, but also more protection against stray light.

Die Fig. 13 und 14 zeigen Lamellen 3, die in Lamellenlängsrichtung bzw. entlang ihrer Längsachse 16 gekrümmt sind. Mit 18 ist das Gehäuse der Signalleuchte bezeichnet, und die Krümmung der Lamelle ist bei 16 zu erkennen.13 and 14 show slats 3 which are curved in the longitudinal direction of the slats or along their longitudinal axis 16. The housing of the signal lamp is designated by 18, and the curvature of the lamella can be seen at 16.

Die Fig. 15, 16, 17, 18 und 19 schließlich zeigen Möglichkeiten zur veränderbaren Ausrichtung der Lamellen. Die mit Lagerzapfen 20 versehenen Lamellen 3 liegen in Bohrungen in einem Lagerrahmen 21, der mittels Nieten 22 am Gehäuse befestigt ist. Mittels einer Gewindespindel 24, die durch eine Mutter 23 sich durch das Gehäuse 18 erstreckt und die, durch einen Durchbruch 26 in der Lamelle 3 gehend, über Anschläge 25 an den Lamellen angreift, können die Lamellen durch das Bedienungspersonal der Signalleuchte verstellt werden.15, 16, 17, 18 and 19 finally show possibilities for changing the alignment of the slats. The lamellae 3 provided with bearing pins 20 lie in bores in a bearing frame 21 which is fastened to the housing by means of rivets 22. By means of a threaded spindle 24, which extends through the housing 18 through a nut 23 and which, passing through an opening 26 in the lamella 3, engages via stops 25 on the lamellae, the lamellae can be adjusted by the operating personnel of the signal light.

Bei der in den Fig. 18 und 19 dargestellten Ausführungsform sind die mittels eines Fortsatzes 28 an einem Rahmenstreifen 27 des Gehäuses 18 befestigten Lamellen 3 bereits durch den Hersteller, der diese Lamellen im tordierbaren Zapfenbereich 28 verbiegt, in ihrer Lage verändert.In the embodiment shown in FIGS. 18 and 19, the position of the slats 3 fastened to a frame strip 27 of the housing 18 by means of an extension 28 has already been changed by the manufacturer, who bends these slats in the twistable pin region 28.

Claims (6)

1. Device for reducing the light reflection at traffic lights caused by external light, consisting of a plurality of laminae (3) which are adapted to absorb the external light striking their upper sides at an angle and which are arranged in front of the light source parallel to and at a spacing from one another, characterised in that the upper sides (4), which face the external light source, of the laminae (3) are highly light-absorbent, while the underside (5) of the laminae (3) are highly light-reflective.
2. Device according to claim 1, characterised in that the undersides (5) of the laminae (3) are specular.
3. Device according to claim 1, characterised in that the undersides (5) of the laminae (3) are formed so as to scatter light in a diffused manner.
4. Device according to claim 1, characterised in that the undersides (5) of the laminae (3) have a structure which influences the distribution of the signal light.
5. Device according to one of claims 1 to 4, characterised in that the laminae (3) are cirved in the longitudinal direction thereof.
6. Device according to one of claims 1 to 4, characterised in that the laminae (3) are curved in the transverse direction thereof.
EP79105112A 1978-12-12 1979-12-12 Device for reducing the reflection of light in traffic lights, caused by external light sources Expired EP0012430B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79105112T ATE3082T1 (en) 1978-12-12 1979-12-12 DEVICE FOR REDUCING THE LIGHT REFLECTION CAUSED BY EXTERNAL FOREIGN LIGHT FROM TRAFFIC LIGHTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2853482A DE2853482C2 (en) 1978-12-12 1978-12-12 Traffic light
DE2853482 1978-12-12

Publications (2)

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EP0012430A1 EP0012430A1 (en) 1980-06-25
EP0012430B1 true EP0012430B1 (en) 1983-04-13

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Application Number Title Priority Date Filing Date
EP79105112A Expired EP0012430B1 (en) 1978-12-12 1979-12-12 Device for reducing the reflection of light in traffic lights, caused by external light sources

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Country Link
EP (1) EP0012430B1 (en)
AT (1) ATE3082T1 (en)
DE (1) DE2853482C2 (en)
WO (1) WO1980001313A1 (en)
YU (1) YU301679A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2528420B2 (en) * 1992-07-02 1996-08-28 信号電材株式会社 External light reflection prevention device for signal lights
WO2006050678A1 (en) * 2004-11-13 2006-05-18 Infokom Gmbh Signal light unit with phantom light suppression

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE923594C (en) * 1949-10-04 1955-02-17 Union Sils Van De Loo & Co Signal lamps, in particular direction indicators for motor vehicles
DE915657C (en) * 1951-05-31 1954-07-26 Friedrich Schmitt Headlights for automobiles and vehicles of all kinds
US2616957A (en) * 1951-07-24 1952-11-04 Sr John Charles Thiem High-visibility traffic signal
DE1863517U (en) * 1959-07-22 1962-12-06 Sendlinger Optische Glaswerke SIGNAL HEADLIGHTS, IN PARTICULAR FOR ROAD TRAFFIC.
DE2709323A1 (en) * 1976-03-04 1977-09-08 Futuritwerk Ag Screen plate for traffic lighting fitting - has deep channels in honeycomb ensuring good visibility when viewed against sunlight
DE2634522A1 (en) * 1976-07-31 1978-02-02 Rau Swf Autozubehoer Vehicle signalling light assembly - has collimator with moulded horizontal louvre pattern inside lens

Also Published As

Publication number Publication date
YU301679A (en) 1982-06-30
DE2853482A1 (en) 1980-06-19
EP0012430A1 (en) 1980-06-25
ATE3082T1 (en) 1983-04-15
DE2853482C2 (en) 1982-12-30
WO1980001313A1 (en) 1980-06-26

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