EP2927890A2 - Signal transmitter for dispensing a light signal - Google Patents

Signal transmitter for dispensing a light signal Download PDF

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Publication number
EP2927890A2
EP2927890A2 EP15158840.7A EP15158840A EP2927890A2 EP 2927890 A2 EP2927890 A2 EP 2927890A2 EP 15158840 A EP15158840 A EP 15158840A EP 2927890 A2 EP2927890 A2 EP 2927890A2
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EP
European Patent Office
Prior art keywords
fresnel lens
light
lens
light source
inner housing
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.)
Granted
Application number
EP15158840.7A
Other languages
German (de)
French (fr)
Other versions
EP2927890A3 (en
EP2927890B1 (en
Inventor
Friedrich Fischer
Heiko Junker
Birger Langhammer
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Siemens AG
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Siemens AG
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Publication of EP2927890A3 publication Critical patent/EP2927890A3/en
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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights
    • 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
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • F21V23/004—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board
    • F21V23/006—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board the substrate being distinct from the light source holder
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/504—Cooling arrangements characterised by the adaptation for cooling of specific components of refractors
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • 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
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2111/02—Use 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to a signal generator for emitting a light signal for road or rail traffic according to the preamble of claim 1.
  • traffic signal systems For traffic control on traffic routes, the use of traffic signal systems is known which have signal transmitters for emitting light signals.
  • traffic light systems primarily serve to control road traffic at inner-city hubs.
  • signalers are arranged in three vertically juxtaposed fields and hung on the approaching road users aligned on poles.
  • Such dreifeldige signal generator are alternately releasing and blocking signals to the vehicle traffic after a running in a control unit signal plan.
  • Such a signal generator comprises a cup-shaped plastic inner housing with a front opening.
  • a light source with at least one light emitting diode and a driver assembly for powering the light source are arranged.
  • the front opening is closed by an optical attachment for influencing the light emitted by the light source.
  • the optical attachment has an inner Fresnel lens and an outer lens.
  • the Fresnel lens has, in an optically active region, a series of annular steps, in the passage of which light emitted by the point light source is concentrated.
  • the downstream in the optical path lens has honeycomb, spider web or prism pattern, which ensures a uniform distribution of light on the lens.
  • Symbol masks may be arranged in the space between Fresnel lens and diffuser if the signal image represented by the signal generator contains a symbol, such as a directional arrow or a character, such as pedestrians, cyclists, tram or the like.
  • Signaling devices for traffic engineering have to meet certain standards with regard to the optical values, for example light intensity distribution, emission characteristics and luminance according to EN 12368 or DIN 67527-1, and with respect to electrical values, for example operating voltage and power consumption according to DIN VDE 0832. Due to their installation at locations with different climatic conditions, the signalers require error-free operation at working temperatures from -40 ° C to +60 ° C. Furthermore, signal generators according to DIN EN 12368 must at least comply with protection class IP65: the inner housing closed by the optical attachment must therefore be dustproof with respect to protection against foreign bodies; it must be protected against jet water (nozzle) from any angle and complete contact protection from electrical voltage Offer components.
  • the invention is therefore based on the object to provide a signal generator of the type mentioned, in which the use of costly components with increased operating temperatures is avoided, but which can still be reliable in operation over a long service life.
  • the signal generator for emitting a light signal for road or rail transport comprises a cup-shaped inner housing with a front opening.
  • a light source with at least one light emitting diode and a driver assembly for powering the light source are arranged in the inner housing.
  • the front opening is closed by an optical attachment for influencing the light emitted by the light source.
  • the optical attachment has an inner Fresnel lens and an outer lens.
  • the Fresnel lens has air channels which connect an inner space enclosed by the inner housing and the Fresnel lens to a space enclosed by the Fresnel lens and the diffuser.
  • the Fresnel lens has an optically active central region and an edge region surrounding this circular ring, the air channels extending in the edge region.
  • the air channels are arranged in the edge region of the Fresnel lens, a disturbance of the emitted signal image is minimized.
  • the Fresnel lens has in its edge region an annular approach facing the interior, through which the air ducts extend in the radial direction from an inner lateral surface to an outer lateral surface of the neck.
  • the air ducts are distributed over the edge region at a regular pitch circle distance.
  • a uniform distribution of the ventilation channels over the edge region of the Fresnel lens offers the heated air at a plurality of spaced-apart locations the opportunity to flow from the interior into the intermediate space in order to ensure good heat dissipation.
  • twelve air ducts can be arranged at angular intervals of 30 ° to each other. If the Fresnel lens is made as an injection molded part, leave the air ducts easily incorporate into the Fresnel lens.
  • the inner housing has a bottom wall opposite the front opening and this side wall connecting to the front opening at the edge, wherein the bottom wall and side walls are lined inside at least partially by a cooling plate.
  • the heat sink has a large heat capacity and can - in comparison to the heat dissipation through the air ducts as an additional or even as a major measure - absorb heat from the heated air of the interior, distribute and dissipate through floor and side walls to the environment.
  • An inventive signal generator 1 comprises according to FIG. 4 an outer housing 2, the front side of a housing door 3 is closed.
  • the housing door 3 may be articulated on the outer housing 2 via pivot bearings arranged at the side.
  • With the housing door 3 is a pot-shaped or trough-shaped inner housing 5 is connected via a profile seal 4 with a front opening 6, which projects into the outer housing 2.
  • With reference also to FIG. 1 is the front opening 6 through an optical attachment 7, which also engages in the profile seal 4, sealed.
  • the optical attachment 7 has an inside Fresnel lens 8 and an outside diffuser 9 on.
  • a symbol mask 10 here for example a pedestrian symbol, can be arranged.
  • the at least one light-emitting diode 11 is arranged on a bottom wall 12 of the inner housing 5.
  • a driver assembly 13 for powering the at least one light-emitting diode 11 is arranged in the inner housing 5, which is mounted on an inclined side wall 14 of the inner housing 5.
  • the driver assembly 13 comprises a carrier plate on which electronic components, among others a transformer and switching diodes, transistors and coils of a heat-producing power unit but also a temperature-sensitive capacitor for current smoothing and buffering, are attached.
  • Bottom wall 12 and / or side walls 14 of the inner housing 5 are inside at least partially lined by a cooling plate 15. Heat generated in the power section of the driver board 13 is effectively conducted to the large-area heat sink 20. Due to the close arrangement of the cooling plate 15 on the bottom wall 12 and side walls 14, the heat absorbed is dissipated well via the inner housing 5 to the ambient air.
  • the Fresnel lens 8 For further removal of heated air from an inner housing 5 and Fresnel lens 8 enclosed interior 16, the Fresnel lens 8 according to 2 and FIG. 3 Air channels 17, which connect the interior 16 with an enclosed by Fresnel lens 8 and diffuser 9 space 18. Thus, a direct flow of air from the interior 16 is made possible in the intermediate space 18, where the heated air can cool at the standing with the outdoor environment 19 in contact lens 9.
  • the air channels 17 are arranged in an edge region 20 of the Fresnel lens 8.
  • the edge region 20 annularly surrounds an optically active central region 21 of the Fresnel lens 8, in which a number of annular steps 22 for focusing the light are arranged.
  • the Fresnel lens 8 has in its edge region 20 an inner space 16 facing annular projection 23, wherein the air channels 17 extend from an inner circumferential surface 24 to an outer lateral surface 25 of the projection 23.
  • twelve air channels 17 are distributed uniformly over the edge region 20 with a pitch circle distance 26 of 30 °.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Traffic Control Systems (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

Die Erfindung betrifft einen Signalgeber (1) zur Abgabe eines Lichtsignals für den Straßen- oder Schienenverkehr. Er umfassend ein topfförmiges Innengehäuse (5) mit einer Frontöffnung (6), in welchem eine Lichtquelle mit wenigstens einer Leuchtdiode (11) und eine Treiberbaugruppe (13) zur Energieversorgung der Lichtquelle angeordnet sind. Er umfasst ferner einen die Frontöffnung (6) verschließenden Optikaufsatz (7) zur Beeinflussung des von der Lichtquelle emittierten Lichtes, der eine innen liegende Fresnellinse (8) und eine außen liegende Streuscheibe (9) aufweist. Erfindungsgemäß weist die Fresnellinse (8) Luftkanäle (17) auf, die einen von Innengehäuse (5) und Fresnellinse (8) umschlossenen Innenraum (16) mit einem von Fresnellinse (8) und Streuscheibe (9) umschlossenen Zwischenraum (18) verbinden. Hierdurch wird bei einem erfindungsgemäßen Signalgeber (1) ein Luftstrom von erwärmter Luft aus dem Innenraum (16) in den Zwischenraum () ermöglicht, wodurch der Einsatz von kostspieligen Bauteilen mit erhöhten Betriebstemperaturen vermieden, aber trotzdem ein zuverlässiger Betrieb über eine große Lebensdauer erreicht wird.

Figure imgaf001
The invention relates to a signal generator (1) for emitting a light signal for road or rail traffic. It comprises a pot-shaped inner housing (5) with a front opening (6), in which a light source with at least one light emitting diode (11) and a driver assembly (13) are arranged for supplying power to the light source. It further comprises an optical attachment (7) closing the front opening (6) for influencing the light emitted by the light source, which has an inner Fresnel lens (8) and an outer diffuser (9). According to the invention, the Fresnel lens (8) on air ducts (17) which connect one of the inner housing (5) and Fresnel lens (8) enclosed interior (16) with a Fresnel lens (8) and lens (9) enclosed gap (18). In this way, in a signal generator (1) according to the invention, an air flow of heated air from the interior space (16) into the intermediate space () is made possible, whereby the use of costly components with increased operating temperatures is avoided, but nevertheless reliable operation over a long service life is achieved.
Figure imgaf001

Description

Die Erfindung betrifft einen Signalgeber zur Abgabe eines Lichtsignals für den Straßen- oder Schienenverkehr nach dem Oberbegriff des Patentanspruches 1.The invention relates to a signal generator for emitting a light signal for road or rail traffic according to the preamble of claim 1.

Zur Verkehrssteuerung an Verkehrswegen ist der Einsatz von Lichtsignalanlagen bekannt, die Signalgeber zur Abgabe von Lichtsignalen aufweisen. Neben der Steuerung des Schienenverkehrs dienen Lichtsignalanlagen vor allem zur Steuerung des Straßenverkehrs an innerstädtischen Knotenpunkten. Hier werden Signalgeber in drei vertikal aneinandergereihten Feldern angeordnet und auf die herannahenden Verkehrsteilnehmer ausgerichtet an Masten aufgehängt. Solche dreifeldige Signalgeber geben nach einem in einem Steuergerät ablaufenden Signalplan abwechselnd Freigabe- und Sperrsignale an den Fahrzeugverkehr ab.For traffic control on traffic routes, the use of traffic signal systems is known which have signal transmitters for emitting light signals. In addition to the control of rail traffic, traffic light systems primarily serve to control road traffic at inner-city hubs. Here signalers are arranged in three vertically juxtaposed fields and hung on the approaching road users aligned on poles. Such dreifeldige signal generator are alternately releasing and blocking signals to the vehicle traffic after a running in a control unit signal plan.

Ein derartiger Signalgeber umfasst ein topfförmiges Innengehäuse aus Kunststoff mit einer Frontöffnung. In dem Innengehäuse sind eine Lichtquelle mit wenigstens einer Leuchtdiode und eine Treiberbaugruppe zur Energieversorgung der Lichtquelle angeordnet. Die Frontöffnung wird durch einen Optikaufsatz zur Beeinflussung des von der Lichtquelle emittierten Lichtes verschlossen. Der Optikaufsatz weist eine innen liegende Fresnellinse und eine außen liegende Streuscheibe auf. Die Fresnellinse weist in einem optisch aktiven Bereich eine Reihe ringförmiger Stufen auf, bei deren Durchtritt von der punktförmigen Lichtquelle emittiertes Licht gebündelt wird. Die im optischen Pfad nachgeschaltete Streuscheibe weist Waben-, Spinnweb- oder Prismenmuster auf, welches für eine gleichmäßige Lichtverteilung auf der Streuscheibe sorgt. Im Zwischenraum zwischen Fresnellinse und Streuscheibe können Symbolmasken angeordnet sein, wenn das vom Signalgeber dargestellte Signalbild ein Symbol enthält, etwa einen Richtungspfeil oder eine Figur, wie Fußgänger, Radfahrer, Straßenbahn oder dergleichen.Such a signal generator comprises a cup-shaped plastic inner housing with a front opening. In the inner housing, a light source with at least one light emitting diode and a driver assembly for powering the light source are arranged. The front opening is closed by an optical attachment for influencing the light emitted by the light source. The optical attachment has an inner Fresnel lens and an outer lens. The Fresnel lens has, in an optically active region, a series of annular steps, in the passage of which light emitted by the point light source is concentrated. The downstream in the optical path lens has honeycomb, spider web or prism pattern, which ensures a uniform distribution of light on the lens. Symbol masks may be arranged in the space between Fresnel lens and diffuser if the signal image represented by the signal generator contains a symbol, such as a directional arrow or a character, such as pedestrians, cyclists, tram or the like.

Signalgeber für die Straßenverkehrstechnik haben bestimmte Normen bezüglich der optischen Werte, zum Beispiel Lichtstärkeverteilung, Abstrahlcharakteristik und Leuchtdichte gemäß EN 12368 beziehungsweise DIN 67527-1, und bezüglich elektrischer Werte, zum Beispiel Betriebsspannung und Leistungsaufnahme gemäß DIN VDE 0832, zu erfüllen. Aufgrund ihrer Aufstellung an Einsatzorten mit unterschiedlichsten klimatischen Bedingungen wird von den Signalgebern ein fehlerfreier Betrieb bei Arbeitstemperaturen von -40 °C bis +60 °C gefordert. Ferner müssen Signalgeber gemäß DIN EN 12368 mindestens die Schutzklasse IP65 erfüllen: das durch den Optikaufsatz verschlossene Innengehäuse muss demnach in Bezug auf den Schutz gegen Fremdkörper staubdicht sein, es muss Schutz gegen Strahlwasser (Düse) aus beliebigem Winkel und vollständigen Berührungsschutz von unter elektrischer Spannung stehenden Bauteile bieten.Signaling devices for traffic engineering have to meet certain standards with regard to the optical values, for example light intensity distribution, emission characteristics and luminance according to EN 12368 or DIN 67527-1, and with respect to electrical values, for example operating voltage and power consumption according to DIN VDE 0832. Due to their installation at locations with different climatic conditions, the signalers require error-free operation at working temperatures from -40 ° C to +60 ° C. Furthermore, signal generators according to DIN EN 12368 must at least comply with protection class IP65: the inner housing closed by the optical attachment must therefore be dustproof with respect to protection against foreign bodies; it must be protected against jet water (nozzle) from any angle and complete contact protection from electrical voltage Offer components.

Hierzu ist aus der Gebrauchsmusterschrift DE 20 2006 014 987 U1 eine Signalleuchte mit einer schwenkbaren Tür bekannt, die eine vertiefte Aufnahme zur Bildung eines Innengehäuses für eine LED-Leuchteinrichtung sowie eine dieser zugeordnete Elektronik aufweist. Eine frontseitige Öffnung der Tür wird durch eine aufgesetzte Linse, umfassend eine innere Fresnellinse und eine äußere Streulinse, verschlossen. Ein um die Öffnung verlaufender Aufnahmerand weist eine Aufnahmenut auf, in die eine Dichtung, bevorzugt eine Dichtschnur oder ein O-Ring eingesetzt wird. Darauf sitzt zum dichtenden Abschluss der Aufnahme die Fresnellinse.This is from the utility model DE 20 2006 014 987 U1 a signal lamp with a pivotable door known which has a recessed receptacle for forming an inner housing for an LED lighting device and one of these associated electronics. A front opening of the door is closed by an attached lens comprising an inner Fresnel lens and an outer diffuser lens. A receiving edge extending around the opening has a receiving groove, into which a seal, preferably a sealing cord or an O-ring, is inserted. On top of this, the Fresnel lens sits to seal the picture.

Durch die erforderliche Abdichtung des Innengehäuses ist die Abfuhr von Wärme, die durch Verlustleistung der Leuchtdiodenbaugruppe und/oder der Treiberbaugruppe entsteht, erschwert.Due to the required sealing of the inner housing, the dissipation of heat caused by power loss of the LED assembly and / or the driver assembly is difficult.

Aus der DE-Produktschrift " Der neue LED3 Signalgeber: Sicherheit mit System", herausgegeben 2003 von der Siemens AG unter der Bestell-Nr. E10003-A800-W18 , ist es bekannt, in das Innengehäuse eine Kühlplatte durch Eingießen zu integrieren. Eine im Innengehäuse eingegossene Kühlplatte ist aufwändig in der Fertigung und hat durch die Einbettung in Kunststoff nur sehr eingeschränkte Wärmeabführeigenschaften.From the DE product publication " The new LED3 signaling device: safety with system ", published 2003 by Siemens AG under order number E10003-A800-W18 , It is known to integrate a cooling plate by pouring into the inner housing. A cast in the inner housing cooling plate is complex in production and has by embedding in plastic only very limited heat dissipation properties.

Die Maßnahmen zur Wärmeabfuhr bekannter Signalgeber vermindern die Lebensdauern temperaturempfindlicher, elektronischer Bauteile oder erfordern den Einsatz von Bauteilen mit ausreichend hoher Betriebstemperatur, was den Signalgeber teurer macht.The measures for heat dissipation known alarms reduce the life of temperature-sensitive electronic components or require the use of components with sufficiently high operating temperature, which makes the signal generator more expensive.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Signalgeber der eingangs genannten Art bereitzustellen, bei dem der Einsatz von kostspieligen Bauteilen mit erhöhten Betriebstemperaturen vermieden wird, der aber trotzdem über eine große Lebensdauer zuverlässig im Betrieb sein kann.The invention is therefore based on the object to provide a signal generator of the type mentioned, in which the use of costly components with increased operating temperatures is avoided, but which can still be reliable in operation over a long service life.

Die Aufgabe wird gelöst durch einen gattungsgemäßen Signalgeber mit den im kennzeichnenden Teil des Patentanspruches 1 angegebenen Merkmalen. Demnach umfasst Signalgeber zur Abgabe eines Lichtsignals für den Straßen- oder Schienenverkehr ein topfförmiges Innengehäuse mit einer Frontöffnung. Im Innengehäuse sind eine Lichtquelle mit wenigstens einer Leuchtdiode und eine Treiberbaugruppe zur Energieversorgung der Lichtquelle angeordnet. Die Frontöffnung ist durch einen Optikaufsatz zur Beeinflussung des von der Lichtquelle emittierten Lichtes verschlossen. Der Optikaufsatz weist eine innen liegende Fresnellinse und eine außen liegende Streuscheibe auf. Erfindungsgemäß weist die Fresnellinse Luftkanäle auf, die einen von Innengehäuse und Fresnellinse umschlossenen Innenraum mit einem von Fresnellinse und Streuscheibe umschlossenen Zwischenraum verbinden. Hierdurch kann erwärmte Luft aus dem Innenraum durch die Luftkanäle in den Zwischenraum strömen. Im Zwischenraum kommt die erwärmte Luft in Kontakt mit der Innenseite der Streuscheibe, deren Außenseite mit der kühlen Umgebungsluft in Verbindung steht. Dadurch kann Wärme über die Streuscheibe an die Umgebung abgeführt werden, was die Temperatur der Treiberbaugruppe - immerhin um einige Grad Kelvin - verringert werden. Damit kann auf den Einsatz von Bauelementen mit erhöhten Betriebstemperaturen verzichtet werden, was die Bauteilekosten erfindungsgemäßer Signalgeber reduziert. Außerdem wird die Lebensdauer der Treiberbaugruppe und damit des Signalgebers nicht durch überhöhte Betriebstemperaturen herabgesetzt.The object is achieved by a generic signal generator with the features specified in the characterizing part of claim 1. Accordingly, the signal generator for emitting a light signal for road or rail transport comprises a cup-shaped inner housing with a front opening. In the inner housing, a light source with at least one light emitting diode and a driver assembly for powering the light source are arranged. The front opening is closed by an optical attachment for influencing the light emitted by the light source. The optical attachment has an inner Fresnel lens and an outer lens. According to the invention, the Fresnel lens has air channels which connect an inner space enclosed by the inner housing and the Fresnel lens to a space enclosed by the Fresnel lens and the diffuser. This allows heated air to flow from the interior through the air channels into the intermediate space. In the intermediate space, the heated air comes into contact with the inside of the lens, whose outside with the cool ambient air is connected. This heat can be dissipated through the lens to the environment, which the temperature of the driver assembly - at least by a few degrees Kelvin - are reduced. This can be dispensed with the use of components with elevated operating temperatures, which reduces the component cost of inventive signal generator. In addition, the life of the driver assembly and thus the signal generator is not reduced by excessive operating temperatures.

In einer vorteilhaften Ausführungsform des erfindungsgemäßen Signalgebers weist die Fresnellinse einen optisch aktiven Zentralbereich und einen diesen kreisringförmig umgebenden Randbereich auf, wobei die Luftkanäle im Randbereich verlaufen. Indem die Luftkanäle im Randbereich der Fresnellinse angeordnet sind, wird eine Störung des abgegebenen Signalbilds minimal gehalten.In an advantageous embodiment of the signal generator according to the invention, the Fresnel lens has an optically active central region and an edge region surrounding this circular ring, the air channels extending in the edge region. By the air channels are arranged in the edge region of the Fresnel lens, a disturbance of the emitted signal image is minimized.

In einer bevorzugten Ausgestaltung des erfindungsgemäßen Signalgebers weist die Fresnellinse in ihrem Randbereich einen dem Innenraum zugewandten kreisringförmigen Ansatz auf, durch den die Luftkanäle in radialer Richtung von einer inneren Mantelfläche zu einer äußeren Mantelfläche des Ansatzes verlaufen. Hierdurch kann die Querschnittsfläche der Luftkanäle vergrößert werden, ohne dass diese sich stärker in den optisch aktiven Zentralbereich der Fresnellinse erstrecken.In a preferred embodiment of the signal generator according to the invention, the Fresnel lens has in its edge region an annular approach facing the interior, through which the air ducts extend in the radial direction from an inner lateral surface to an outer lateral surface of the neck. As a result, the cross-sectional area of the air ducts can be increased without these extending more strongly into the optically active central region of the Fresnel lens.

In einer bevorzugten Ausführungsform des erfindungsgemäßen Signalgebers sind die Luftkanäle in einem regelmäßigen Teilkreisabstand über den Randbereich verteilt angeordnet. Eine gleichmäßige Verteilung der Lüftungskanäle über den Randbereich der Fresnellinse bietet der erwärmten Luft an mehreren, voneinander beabstandeten Stellen die Möglichkeit, aus dem Innenraum in den Zwischenraum zu strömen, um eine gute Wärmeabfuhr zu gewährleisten. Beispielsweise können zwölf Luftkanäle in Winkelabständen von 30° zueinander angeordnet werden. Wenn die Fresnellinse als Spritzgussteil gefertigt wird, lassen sich die Luftkanäle auch auf einfache Weise in die Fresnellinse einarbeiten.In a preferred embodiment of the signal generator according to the invention, the air ducts are distributed over the edge region at a regular pitch circle distance. A uniform distribution of the ventilation channels over the edge region of the Fresnel lens offers the heated air at a plurality of spaced-apart locations the opportunity to flow from the interior into the intermediate space in order to ensure good heat dissipation. For example, twelve air ducts can be arranged at angular intervals of 30 ° to each other. If the Fresnel lens is made as an injection molded part, leave the air ducts easily incorporate into the Fresnel lens.

In einer vorteilhaften Ausgestaltung des erfindungsgemäßen Signalgebers weist das Innengehäuse eine der Frontöffnung gegenüber liegende Bodenwand sowie diese mit der Frontöffnung randseitig verbindende Seitenwände auf, wobei Bodenwand und Seitenwände innen wenigstens teilweise durch ein Kühlblech ausgekleidet sind. Das Kühlblech weist eine große Wärmekapazität auf und kann - im Vergleich zur Wärmeabfuhr über die Luftkanäle als Zusatz- oder sogar als Hauptmaßnahme - Wärme aus der erwärmten Luft des Innenraums aufnehmen, verteilen und über Boden- und Seitenwände an die Umgebung abführen.In an advantageous embodiment of the signal generator according to the invention, the inner housing has a bottom wall opposite the front opening and this side wall connecting to the front opening at the edge, wherein the bottom wall and side walls are lined inside at least partially by a cooling plate. The heat sink has a large heat capacity and can - in comparison to the heat dissipation through the air ducts as an additional or even as a major measure - absorb heat from the heated air of the interior, distribute and dissipate through floor and side walls to the environment.

Weitere Eigenschaften und Vorteile des erfindungsgemäßen Signalgebers ergeben sich aus nachfolgender Beschreibung eines Ausführungsbeispiels anhand der Zeichnungen, in deren

FIG 1
eine Explosionsdarstellung eines erfindungsgemäßen Signalgebers,
FIG 2
eine Frontansicht einer Fresnellinse des Signalgebers aus FIG 1,
FIG 3
ein Querschnitt durch die Fresnellinse aus FIG 2 und
FIG 4
ein Teilschnitt des Signalgebers aus FIG 1 im Bereich eines Luftkanals
schematisch veranschaulicht sind.Further features and advantages of the signal generator according to the invention will become apparent from the following description of an embodiment with reference to the drawings, in which
FIG. 1
an exploded view of a signal generator according to the invention,
FIG. 2
a front view of a Fresnel lens of the signaler FIG. 1 .
FIG. 3
a cross section through the Fresnel lens FIG. 2 and
FIG. 4
a partial section of the signal generator FIG. 1 in the area of an air duct
are illustrated schematically.

Ein erfindungsgemäßer Signalgeber 1 umfasst gemäß FIG 4 ein Außengehäuse 2, das frontseitig von einer Gehäusetür 3 verschließbar ist. Die Gehäusetür 3 kann über seitliche angeordnete Schwenklager am Außengehäuse 2 angelenkt sein. Mit der Gehäusetür 3 ist über eine Profildichtung 4 ein topf- oder wannenförmiges Innengehäuse 5 mit einer Frontöffnung 6 verbunden, welches in das Außengehäuse 2 hineinragt. Mit Verweis auch auf FIG 1 ist die Frontöffnung 6 durch einen Optikaufsatz 7, der ebenfalls in die Profildichtung 4 eingreift, dicht verschlossen. Der Optikaufsatz 7 weist eine innen liegende Fresnellinse 8 sowie eine außen liegende Streuscheibe 9 auf. Dazwischen kann eine Symbolmaske 10, hier beispielsweise ein Fußgängersymbol, angeordnet sein. Im Innengehäuse 5 ist eine Lichtquelle mit wenigstens einer Leuchtdiode 11, vorzugsweise drei Leuchtdioden 11, angeordnet, deren emittiertes Licht durch den Optikaufsatz 7 beeinflusst wird. Die wenigstens eine Leuchtdiode 11 ist an einer Bodenwand 12 des Innengehäuses 5 angeordnet. Desweiteren ist im Innengehäuse 5 eine Treiberbaugruppe 13 zur Energieversorgung der wenigstens einen Leuchtdiode 11 angeordnet, die an eine schräg stehende Seitenwand 14 des Innengehäuses 5 montiert ist. Die Treiberbaugruppe 13 umfasst eine Trägerplatte, auf der elektronische Bauteile, unter anderen ein Transformator sowie Schaltdioden, -transistoren und -spulen eines Wärme produzierenden Leistungsteils aber auch ein temperaturempfindlicher Kondensator zur Stromglättung und Pufferung, befestigt sind. Bodenwand 12 und/oder Seitenwände 14 des Innengehäuses 5 sind innen wenigstens teilweise durch ein Kühlblech 15 ausgekleidet. Im Leistungsteil der Treiberbaugruppe 13 erzeugte Wärme wird effektiv an das großflächig ausgebildete Kühlblech 20 geleitet. Durch die enge Anordnung des Kühlbleches 15 an Bodenwand 12 und Seitenwände 14 wird die aufgenommene Wärme gut über das Innengehäuse 5 an die Umgebungsluft abgeführt.An inventive signal generator 1 comprises according to FIG. 4 an outer housing 2, the front side of a housing door 3 is closed. The housing door 3 may be articulated on the outer housing 2 via pivot bearings arranged at the side. With the housing door 3 is a pot-shaped or trough-shaped inner housing 5 is connected via a profile seal 4 with a front opening 6, which projects into the outer housing 2. With reference also to FIG. 1 is the front opening 6 through an optical attachment 7, which also engages in the profile seal 4, sealed. The optical attachment 7 has an inside Fresnel lens 8 and an outside diffuser 9 on. In between, a symbol mask 10, here for example a pedestrian symbol, can be arranged. In the inner housing 5, a light source with at least one light emitting diode 11, preferably three light-emitting diodes 11, arranged, the emitted light is influenced by the optical attachment 7. The at least one light-emitting diode 11 is arranged on a bottom wall 12 of the inner housing 5. Furthermore, a driver assembly 13 for powering the at least one light-emitting diode 11 is arranged in the inner housing 5, which is mounted on an inclined side wall 14 of the inner housing 5. The driver assembly 13 comprises a carrier plate on which electronic components, among others a transformer and switching diodes, transistors and coils of a heat-producing power unit but also a temperature-sensitive capacitor for current smoothing and buffering, are attached. Bottom wall 12 and / or side walls 14 of the inner housing 5 are inside at least partially lined by a cooling plate 15. Heat generated in the power section of the driver board 13 is effectively conducted to the large-area heat sink 20. Due to the close arrangement of the cooling plate 15 on the bottom wall 12 and side walls 14, the heat absorbed is dissipated well via the inner housing 5 to the ambient air.

Zur weiteren Abfuhr von erwärmter Luft aus einem von Innengehäuse 5 und Fresnellinse 8 umschlossenen Innenraum 16 weist die Fresnellinse 8 gemäß FIG 2 und FIG 3 Luftkanäle 17 auf, die den Innenraum 16 mit einem von Fresnellinse 8 und Streuscheibe 9 umschlossenen Zwischenraum 18 verbinden. So wird ein direkter Luftstrom aus dem Innenraum 16 in den Zwischenraum 18 ermöglicht, wo sich die erwärmte Luft an der mit der Außenumgebung 19 im Kontakt stehenden Streuscheibe 9 abkühlen kann. Um das Signalbild nicht oder nur vernachlässigbar zu stören, sind die Luftkanäle 17 in einem Randbereich 20 der Fresnellinse 8 angeordnet. Der Randbereich 20 umgibt kreisringförmig einen optisch aktiven Zentralbereich 21 der Fresnellinse 8, in dem eine Reihe ringförmiger Stufen 22 zur Bündelung des Lichts angeordnet sind. Die Fresnellinse 8 weist in ihrem Randbereich 20 einen dem Innenraum 16 zugewandten kreisringförmigen Ansatz 23 auf, wobei sich die Luftkanäle 17 von einer inneren Mantelfläche 24 zu einer äußeren Mantelfläche 25 des Ansatzes 23 erstrecken. Im dargestellten Ausführungsbeispiel sind zwölf Luftkanäle 17 mit einem Teilkreisabstand 26 von 30° gleichmäßig über den Randbereich 20 verteilt. Durch diese gezielt eingebrachten Luftkanäle 17 in der Fresnellinse 8 kann im Innenraum 16 eine Temperaturreduktion um weitere 2 °C erreicht werden, was bei Innenraumtemperaturen nahe der Obergrenze der Bauteilbetriebstemperaturen entscheidend sein kann.For further removal of heated air from an inner housing 5 and Fresnel lens 8 enclosed interior 16, the Fresnel lens 8 according to 2 and FIG. 3 Air channels 17, which connect the interior 16 with an enclosed by Fresnel lens 8 and diffuser 9 space 18. Thus, a direct flow of air from the interior 16 is made possible in the intermediate space 18, where the heated air can cool at the standing with the outdoor environment 19 in contact lens 9. To disturb the signal image not or only negligibly, the air channels 17 are arranged in an edge region 20 of the Fresnel lens 8. The edge region 20 annularly surrounds an optically active central region 21 of the Fresnel lens 8, in which a number of annular steps 22 for focusing the light are arranged. The Fresnel lens 8 has in its edge region 20 an inner space 16 facing annular projection 23, wherein the air channels 17 extend from an inner circumferential surface 24 to an outer lateral surface 25 of the projection 23. In the illustrated embodiment, twelve air channels 17 are distributed uniformly over the edge region 20 with a pitch circle distance 26 of 30 °. As a result of these specifically introduced air ducts 17 in the Fresnel lens 8, a temperature reduction by a further 2 ° C. can be achieved in the interior 16, which can be decisive for interior temperatures near the upper limit of the component operating temperatures.

Claims (5)

Signalgeber (1) zur Abgabe eines Lichtsignals für den Straßen- oder Schienenverkehr, umfassend ein topfförmiges Innengehäuse (5) mit einer Frontöffnung (6), in welchem eine Lichtquelle mit wenigstens einer Leuchtdiode (11) und eine Treiberbaugruppe (13) zur Energieversorgung der Lichtquelle angeordnet sind, und einen die Frontöffnung (6) verschließenden Optikaufsatz (7) zur Beeinflussung des von der Lichtquelle emittierten Lichtes, der eine innen liegende Fresnellinse (8) und eine außen liegende Streuscheibe (9) aufweist, dadurch gekennzeichnet, dass die Fresnellinse (8) Luftkanäle (17) aufweist, die einen von Innengehäuse (5) und Fresnellinse (8) umschlossenen Innenraum (16) mit einem von Fresnellinse (8) und Streuscheibe (9) umschlossenen Zwischenraum (18) verbinden.A signal generator (1) for emitting a light signal for road or rail traffic, comprising a cup-shaped inner housing (5) with a front opening (6), in which a light source with at least one light emitting diode (11) and a driver assembly (13) for powering the light source are arranged, and the front opening (6) closing optical attachment (7) for influencing the light emitted from the light source having an inner Fresnel lens (8) and an outer lens (9), characterized in that the Fresnel lens (8 ) Having air channels (17) which connect a of inner housing (5) and Fresnel lens (8) enclosed interior (16) with a Fresnel lens (8) and lens (9) enclosed gap (18). Signalgeber (1) nach Anspruch 1, wobei die Fresnellinse (8) einen optisch aktiven Zentralbereich (21) und einen diesen kreisringförmig umgebenden Randbereich (20) aufweist und wobei die Luftkanäle (17) im Randbereich (20) verlaufen.Signal transmitter (1) according to claim 1, wherein the Fresnel lens (8) has an optically active central region (21) and an edge region (20) surrounding the same in annular fashion, and wherein the air channels (17) extend in the edge region (20). Signalgeber (1) nach Anspruch 2, wobei die Fresnellinse (8) in ihrem Randbereich (20) einen dem Innenraum (16) zugewandten kreisringförmigen Ansatz (23) aufweist, durch den die Luftkanäle (17) in radialer Richtung von einer inneren Mantelfläche (24) zu einer äußeren Mantelfläche (25) des Ansatzes (23) verlaufen.Signal transmitter (1) according to claim 2, wherein the Fresnel lens (8) in its edge region (20) has an inner space (16) facing annular projection (23) through which the air channels (17) in the radial direction from an inner circumferential surface (24 ) extend to an outer lateral surface (25) of the projection (23). Signalgeber (1) nach Anspruch 3, wobei die Luftkanäle (17) in einem regelmäßigen Teilkreisabstand (26) über den Randbereich (20) verteilt angeordnet sind.Signal transmitter (1) according to claim 3, wherein the air ducts (17) are distributed over the edge region (20) at a regular pitch circle distance (26). Signalgeber (1) nach einem der Ansprüche 1 bis 4, wobei das Innengehäuse (5) eine der Frontöffnung (6) gegenüber liegende Bodenwand (12) sowie diese mit der Frontöffnung (6) randseitig verbindende Seitenwände (14) aufweist, wobei Bodenwand (12) und Seitenwände (14) innen wenigstens teilweise durch ein Kühlblech (15) ausgekleidet sind.Signaling device (1) according to one of claims 1 to 4, wherein the inner housing (5) has a front wall (6) opposite the bottom wall (12) and this with the front opening (6) peripherally connecting side walls (14), said bottom wall (12) and side walls (14) inside at least partially lined by a cooling plate (15).
EP15158840.7A 2014-03-24 2015-03-12 Signal transmitter for dispensing a light signal Active EP2927890B1 (en)

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ES2648092T3 (en) 2017-12-28
DE102014205453A1 (en) 2015-09-24

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