EP0446423B1 - Lighting fixture - Google Patents

Lighting fixture Download PDF

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Publication number
EP0446423B1
EP0446423B1 EP90121178A EP90121178A EP0446423B1 EP 0446423 B1 EP0446423 B1 EP 0446423B1 EP 90121178 A EP90121178 A EP 90121178A EP 90121178 A EP90121178 A EP 90121178A EP 0446423 B1 EP0446423 B1 EP 0446423B1
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EP
European Patent Office
Prior art keywords
reflector
lamp
housing
cold light
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90121178A
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German (de)
French (fr)
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EP0446423A1 (en
Inventor
Tetsuhiro Kano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nafa Light Kurt Maurer
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Nafa Light Kurt Maurer
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Publication of EP0446423A1 publication Critical patent/EP0446423A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/04—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out infrared radiation
    • 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
    • F21V29/15—Thermal insulation
    • 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
    • F21V29/505—Cooling arrangements characterised by the adaptation for cooling of specific components of reflectors
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • 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
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89—Metals
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material

Definitions

  • the invention relates to a lamp with the features of the preamble of patent claim 1.
  • Such a lamp is known from FR-A-1 454 845.
  • a housing described with an upper wall, a bottom, side walls and a rear wall.
  • the lamp has a front opening.
  • a light source is provided with an elongated filament.
  • Another reflector is arranged behind the reflector of the light source and reflects infrared radiation from the light source to the housing. No opening for the passage of air is arranged between the infrared reflector and the housing wall. Rather, the infrared reflector is connected directly to the housing. As a result, ventilation and cooling of the lamp is only possible to a very limited extent.
  • Cold light reflectors known as such reflect light in the visible region of the electromagnetic spectrum, in particular at higher wavelengths, but allow infrared radiation to pass through. Such cold light reflectors are used in luminaires for technical and aesthetic reasons. A cold light reflector generates luminaire radiation from which infrared (and possibly also red) radiation components have been removed. This creates a certain aesthetic effect. Technically, the use of cold light reflectors has the effect that the radiation generated by the lamp does not cause undesired heating of the illuminated object due to the lack of infrared components.
  • incandescent lamps such as halogen incandescent lamps
  • infrared radiation Plant's emitter
  • a luminaire equipped with a cold light reflector only reflects visible ones Radiation forward in the direction of radiation of the luminaire, while infrared rays are transmitted to the rear by the cold light reflector.
  • the cold light reflector is installed in a housing, the infrared rays are emitted into the housing. Problems arise in the housing due to undesirable heat development.
  • the temperature at the neck of the incandescent lamp should remain below a predetermined limit. If the temperature exceeds certain limit values, the luminaire only has a short lifespan. For example, a limit value of 350 ° C applies to an incandescent lamp with an average lifespan of 2000 hours.
  • the use of a cold light reflector in a luminaire can lead to an increase in the temperatures in the housing of the luminaire, since infrared rays pass through the cold light reflector to the rear.
  • the problem of excessive heating inside the housing arises in particular when the incandescent lamp has a power consumption of more than 50 W.
  • the problem of heat development is particularly critical when the incandescent lamp is used in a hanging position (vertical). In this case, the neck is directly above the light bulb.
  • a cold light reflector not only lets the infrared rays through, but also a visible part of the electromagnetic spectrum (especially in the red range). This light is emitted to the outside through the openings mentioned and has a disruptive effect. The appearance of the lamp is also not very appealing due to the openings.
  • the object of the invention is to improve a lamp of the type mentioned in such a way that in the interior of the lamp housing and in particular at the so-called pinching point of the incandescent lamp there is a relatively low temperature, the lamp should also be aesthetically pleasing overall .
  • the socket of the light source is attached to the further reflector. Since the further reflector is only effective inside the luminaire housing, i.e. radiation reflected by it does not come out of the housing of the lamp, it can also be referred to as an "internal reflector".
  • the lamp according to the invention does not require any slots or holes in the housing wall.
  • the further reflector (inner reflector) is in heat-conducting connection with the housing wall.
  • This heat-conducting connection is preferably realized by means of one or more webs which connect the inner reflector to the housing wall in a heat-conducting manner and at the same time support it.
  • the light source or a part connected to it projects freely through a central opening in the cold light reflector. This creates a further flow path for air, which causes heat to be dissipated.
  • one or more openings or a circumferential free space is provided between the further reflector and the housing wall, through which air can pass.
  • the housing is provided with openings at the front and rear, which are preferably in the edge region of the lamp, i.e. are arranged near the cylindrical housing outer wall, so that air outside the cold light reflector can enter the interior of the housing near the outer housing wall, sweep past the housing wall and then exit from the interior of the housing in the rear region of the lamp.
  • the reflection surface of the further reflector (inner reflector) has an angle of inclination with respect to the axis of the luminaire that is less than 85 °.
  • the lamp 10 shown in the figures has a housing 12 with a housing wall 14.
  • the front of the lamp 10 is provided with the reference number 16, i.e. the direction of radiation of the lamp 10 points in the direction of the arrow S. This results in the terms “front” and “rear” used in the claims.
  • a cold light reflector 18 is fastened in the housing 12.
  • the cold light reflector is known as such and reflects light in the visible region of the electromagnetic spectrum, while infrared radiation (and possibly also red components of the radiation) are let through by the cold light reflector 18.
  • the infrared rays are indicated in FIG. 1 by dashed lines and identified by the reference symbol R.
  • a light source 20 with a filament 22 and a glass bulb 24 is arranged such that the filament 22 is positioned approximately at the focal point of the cold light reflector 18.
  • the light source 20 has a tapered neck 26 which can be fastened to a socket 30 by means of two plugs 28.
  • the two plugs 28 are pushed into holes 38 according to FIG. 1.
  • a further reflector 32 is arranged behind the cold light reflector 18.
  • the term "behind” refers to the direction of radiation S of the lamp, which points forward.
  • the further reflector 32 is described in more detail below.
  • the holder 30 is attached to it, so that the light source 20 and in particular its tapered neck 26 is not in contact with the cold light reflector 18 or another component of the lamp.
  • the reflector 32 is mechanically and thermally conductively connected to the housing wall 14 via two diametrically opposite webs 34.
  • an opening 36 which is rotationally symmetrical with respect to the optical axis A of the lamp 10, is formed in the neck of the cold light reflector 18, through which the neck 26 of the light source 20 projects in the center.
  • the reflection surface 40 of the infrared reflector 32 is inclined with respect to the optical axis A of the lamp in such a way that infrared radiation R incident with high efficiency is directed to the inner surface 14 'of the housing wall 14.
  • the infrared radiation generated by the light source 20 is thus largely introduced into the housing wall 14, which thus absorbs the majority of the heat generated by infrared radiation. This heat is dissipated by convection.
  • an opening 42 (which is only interrupted by the webs 34) is provided between the infrared reflector 32 and the housing wall 14, essentially around the entire circumference of the lamp.
  • a plurality of openings 44 are also provided on the front 16 of the lamp 10 adjacent to the housing wall 14 in the front wall, so that air can enter the interior of the housing in the direction of arrows P 1 and flows past the housing wall 14 near the inside 14 ' to continue flowing through the openings 42 to the rear.
  • Corresponding openings are provided in the rear section of the lamp (ie at the end of the lamp opposite the radiation direction S according to FIG. 1, which is not shown in detail in the figure), so that the heated air emerges from the housing 12 in the direction of the arrows P 1 can. Due to the shape of the reflector 32 shown in more detail in FIG. 1, the draft is conveyed through the housing 12.
  • the infrared reflector 32 acts not only as a mechanical socket for the light source 20, but also as a cooling device for the so-called pinching point of the light source 20.
  • the temperature in the critical neck region of the light source remains at relatively low values, although the side walls of the lamp 10 have no openings.
  • the infrared reflector 32 is shaped such that the portions of the infrared radiation reflected on it do not return to the light source, but are essentially directed onto the housing wall 14 of the lamp. Overall, the light source is not heated unnecessarily.
  • relatively cool air causes an effective cooling in the critical area of the neck 26 of the light source 20 when passing through the opening 36, which acts like a nozzle at this point due to the reduced opening cross section.
  • the warm air rises in the direction of the arrows P 2 over the reflection surface 40 and passes through the openings 42 to the side of the infrared reflector 32.
  • the infrared reflector 32 absorbs only a small part of the thermal energy and also dissipates it directly to the housing wall 14 via the webs 34, which have good heat-conducting properties.
  • the housing wall 14 is cooled not only by heat being given off to the outside air, but in particular also by the air flow flowing along the wall in the direction of the arrows P 1 and P 2.
  • the infrared reflector 32 Since the infrared reflector 32 remains relatively cold, as described, there is a considerable temperature gradient from the light source 20 to the infrared reflector 32 the light source 20 also dissipates heat with high efficiency into the infrared reflector 32, which in turn dissipates this heat via the bow-shaped webs 34 into the housing wall 14, which, as described, is cooled in particular by convection.
  • a transformer (not shown) can be installed in the lamp. This is arranged behind the infrared reflector 32 and can in particular be attached to the webs 34.
  • the infrared reflector 32 is dimensioned so large that the transformer cannot be seen from below (according to FIG. 1), or only to a small extent, even when the cold light reflector 18 is removed. As a result, the infrared rays cannot reach the transformer and the heated air flows through the openings 42 past the transformer without being able to heat it up disadvantageously.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Storage Of Fruits Or Vegetables (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Lasers (AREA)

Abstract

In a lighting fixture (10) equipped with a cold-light reflector (18), there is provided behind the cold-light reflector (18) a further reflector (32) which reflects infrared radiation onto a housing wall (14) of the lighting fixture (10). <IMAGE>

Description

Die Erfindung betrifft eine Leuchte mit den Merkmalen des Oberbegriffs des Patentanspruchs 1.The invention relates to a lamp with the features of the preamble of patent claim 1.

Eine solche Leuchte ist aus der FR-A-1 454 845 bekannt. Dort ist ein Gehäuse beschrieben mit einer oberen Wand, einem Boden, Seitenwänden und einer Rückwand. Die Leuchte weist eine Frontöffnung auf. Eine Lichtquelle ist mit einem langgestreckten Filament versehen. Hinter dem Reflektor der Lichtquelle ist ein weiterer Reflektor angeordnet, der Infrarotstrahlung von der Lichtquelle zum Gehäuse reflektiert. Zwischen dem Infrarotreflektor und der Gehäusewand ist keine Öffnung zum Durchlaß von Luft angeordnet. Vielmehr ist der Infrarotreflektor direkt mit dem Gehäuse verbunden. Dies hat zur Folge, daß eine Lüftung und Kühlung der Leuchte nur in sehr begrenztem Maße möglich ist.Such a lamp is known from FR-A-1 454 845. There is a housing described with an upper wall, a bottom, side walls and a rear wall. The lamp has a front opening. A light source is provided with an elongated filament. Another reflector is arranged behind the reflector of the light source and reflects infrared radiation from the light source to the housing. No opening for the passage of air is arranged between the infrared reflector and the housing wall. Rather, the infrared reflector is connected directly to the housing. As a result, ventilation and cooling of the lamp is only possible to a very limited extent.

Als solche bekannte Kaltlichtreflektoren reflektieren Licht im sichtbaren Bereich des elektromagnetischen Spektrums, insbesondere bei höheren Wellenlängen, lassen aber Infrarotstrahlung passieren. Solche Kaltlichtreflektoren werden in Leuchten aus technischen und ästhetischen Gründen verwendet. Mit einem Kaltlichtreflektor wird Leuchtenstrahlung erzeugt, aus der infrarote (und ggf. auch rote) Strahlungsanteile entfernt sind. Hiermit wird eine bestimmte ästhetische Wirkung erzielt. Technisch hat die Verwendung von Kaltlichtreflektoren u.a. den Effekt, daß die von der Leuchte erzeugte Strahlung aufgrund der fehlenden Infrarotkomponenten keine unerwünschte Aufheizung des beleuchteten Objektes bewirkt.Cold light reflectors known as such reflect light in the visible region of the electromagnetic spectrum, in particular at higher wavelengths, but allow infrared radiation to pass through. Such cold light reflectors are used in luminaires for technical and aesthetic reasons. A cold light reflector generates luminaire radiation from which infrared (and possibly also red) radiation components have been removed. This creates a certain aesthetic effect. Technically, the use of cold light reflectors has the effect that the radiation generated by the lamp does not cause undesired heating of the illuminated object due to the lack of infrared components.

Insbesondere bei Verwendung von Glühlampen, wie z.B. Halogen-Glühlampen, werden ganz erhebliche Anteile an Infrarotstrahlung erzeugt (Planck'scher Strahler). Eine mit einem Kaltlichtreflektor versehene Leuchte reflektiert somit nur sichtbare Strahlung nach vorne in Strahlungsrichtung der Leuchte, während Infrarotstrahlen vom Kaltlichtreflektor nach hinten durchgelassen werden.In particular when using incandescent lamps, such as halogen incandescent lamps, very considerable proportions of infrared radiation are generated (Planck's emitter). A luminaire equipped with a cold light reflector only reflects visible ones Radiation forward in the direction of radiation of the luminaire, while infrared rays are transmitted to the rear by the cold light reflector.

Ist der Kaltlichtreflektor dabei in ein Gehäuse eingebaut, so werden die Infrarotstrahlen in das Gehäuse abgestrahlt. Es entstehen im Gehäuse Probleme aufgrund unerwünschter Wärmeentwicklung.If the cold light reflector is installed in a housing, the infrared rays are emitted into the housing. Problems arise in the housing due to undesirable heat development.

Dies betrifft insbesondere auch die Befestigung der Glühlampe, die üblicherweise so angeordnet ist, daß sich ihre Wendel im Brennpunkt des Kaltlichtreflektors befindet. Die sogenannte Quetschungsstelle der Glühlampe (ihr Hals) ist dabei im Bereich des Reflektorhalses positioniert.This applies in particular to the attachment of the incandescent lamp, which is usually arranged in such a way that its filament is located in the focal point of the cold light reflector. The so-called pinch point of the light bulb (its neck) is positioned in the area of the reflector neck.

Die Temperatur am Hals der Glühlampe soll unterhalb eines vorgegebenen Grenzwertes bleiben. Überschreitet die Temperatur bestimmte Grenzwerte, so erreicht die Leuchte nur eine geringe Lebensdauer. Beispielsweise gilt bei einer Glühlampe, deren mittlere Lebensdauer bei 2000 Stunden liegen soll, ein Grenzwert von 350°C.The temperature at the neck of the incandescent lamp should remain below a predetermined limit. If the temperature exceeds certain limit values, the luminaire only has a short lifespan. For example, a limit value of 350 ° C applies to an incandescent lamp with an average lifespan of 2000 hours.

Die Verwendung eines Kaltlichtreflektors in einer Leuchte kann insofern zu einer Erhöhung der Temperaturen im Gehäuse der Leuchte führen, als Infrarotstrahlen nach hinten den Kaltlichtreflektor passieren. Das Problem einer übermäßigen Erhitzung im Inneren des Gehäuses stellt sich insbesondere dann, wenn die Glühlampe eine Leistungsaufnahme von mehr als 50 W hat.The use of a cold light reflector in a luminaire can lead to an increase in the temperatures in the housing of the luminaire, since infrared rays pass through the cold light reflector to the rear. The problem of excessive heating inside the housing arises in particular when the incandescent lamp has a power consumption of more than 50 W.

Das Problem der Wärmeentwicklung ist insbesondere dann kritisch, wenn die Glühlampe in einer hängenden Stellung (vertikal) eingesetzt wird. In diesem Falle steht der Hals direkt über der Glühbirne.The problem of heat development is particularly critical when the incandescent lamp is used in a hanging position (vertical). In this case, the neck is directly above the light bulb.

Es ist möglich, das Gehäuse der Leuchte mit Öffnungen, wie Löchern oder Schlitzen, zu versehen. Ein Kaltlichtreflektor läßt aber nicht nur die Infrarotstrahlen, sondern auch einen sichtbaren Teil des elektromagnetischen Spektrums (insbesondere im Rotbereich) durch. Dieses Licht wird durch die genannten Öffnungen nach außen abgestrahlt und wirkt störend. Auch ist das Aussehen der Leuchte aufgrund der Öffnungen wenig ansprechend.It is possible to provide the housing of the lamp with openings, such as holes or slots. A cold light reflector not only lets the infrared rays through, but also a visible part of the electromagnetic spectrum (especially in the red range). This light is emitted to the outside through the openings mentioned and has a disruptive effect. The appearance of the lamp is also not very appealing due to the openings.

Aufgabe der Erfindung ist es, eine Leuchte der eingangs genannten Art so zu verbessen, daß in einfacher Weise im Inneren des Gehäuses der Leuchte und insbesondere an der sogenannten Quetschungsstelle der Glühlampe eine relativ geringe Temperaur vorliegt, wobei die Leuchte auch insgesamt ästhetisch ansprechend gestaltbar sein soll.The object of the invention is to improve a lamp of the type mentioned in such a way that in the interior of the lamp housing and in particular at the so-called pinching point of the incandescent lamp there is a relatively low temperature, the lamp should also be aesthetically pleasing overall .

Die erfindungsgemäße Lösung dieser Aufgabe ist im Patentanspruch 1 gekennzeichnet.The achievement of this object is characterized in claim 1.

Bevorzugte Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben.Preferred embodiments of the invention are described in the subclaims.

Gemäß einer bevorzugten Weiterbildung der erfindungsgemäßen Leuchte ist die Fassung der Lichtquelle an dem weiteren Reflektor befestigt. Da der weitere Reflektor nur im Inneren des Gehäuses der Leuchte wirksam ist, d.h. von ihm reflektierte Strahlung gelangt nicht aus dem Gehäuse der Leuchte heraus, kann er auch als "Innenreflektor" bezeichnet werden.According to a preferred development of the luminaire according to the invention, the socket of the light source is attached to the further reflector. Since the further reflector is only effective inside the luminaire housing, i.e. radiation reflected by it does not come out of the housing of the lamp, it can also be referred to as an "internal reflector".

Die erfindungsgemäße Leuchte benötigt keine Schlitze oder Löcher in der Gehäusewand.The lamp according to the invention does not require any slots or holes in the housing wall.

Gemäß einer weiteren bevorzugten Ausgestaltung der Erfindung steht der weitere Reflektor (Innenreflektor) in wärmeleitender Verbindung mit der Gehäusewand. Bevorzugt wird diese wärmeleitende Verbindung mittels eines oder mehrerer Stege verwirklicht, die den Innenreflektor wärmeleitend mit der Gehäusewand verbinden und zugleich abstützen.According to a further preferred embodiment of the invention, the further reflector (inner reflector) is in heat-conducting connection with the housing wall. This heat-conducting connection is preferably realized by means of one or more webs which connect the inner reflector to the housing wall in a heat-conducting manner and at the same time support it.

Weiter ist bevorzugt vorgesehen, daß die Lichtquelle oder ein mit ihr verbundenes Teil frei durch eine zentrische Öffnung im Kaltlichtreflektor ragt. Hierdurch wird ein weiterer Strömungsweg für Luft geschaffen, der eine Wärmeabfuhr bewirkt.It is further preferably provided that the light source or a part connected to it projects freely through a central opening in the cold light reflector. This creates a further flow path for air, which causes heat to be dissipated.

Vorteilhaft für eine gute Wärmeabfuhr aus dem Inneren des Gehäuses ist auch, daß zwischen dem weiteren Reflektor und der Gehäusewand eine oder mehrere Öffnungen oder auch ein umlaufender Freiraum vorgesehen ist, durch den Luft durchtreten kann.It is also advantageous for good heat dissipation from the interior of the housing that one or more openings or a circumferential free space is provided between the further reflector and the housing wall, through which air can pass.

Für eine wirksame Luftzirkulation durch die Leuchte ist gemäß einer weiteren Ausgestaltung der Erfindung vorgesehen, daß das Gehäuse vorne und hinten mit Öffnungen versehen ist, die bevorzugt im Randbereich der Leuchte, d.h. nahe der zylindrischen Gehäuse-Außenwand angeordnet sind, so daß Luft außenseitig des Kaltlichtreflektors nahe der äußeren Gehäusewand in das Innere des Gehäuses eintreten, an der Gehäusewand vorbeistreichen und sodann aus dem Inneren des Gehäuses im hinteren Bereich der Leuchte austreten kann.For effective air circulation through the lamp, according to a further embodiment of the invention, it is provided that the housing is provided with openings at the front and rear, which are preferably in the edge region of the lamp, i.e. are arranged near the cylindrical housing outer wall, so that air outside the cold light reflector can enter the interior of the housing near the outer housing wall, sweep past the housing wall and then exit from the interior of the housing in the rear region of the lamp.

Für eine wirksame Wärmeabfuhr aus dem Gehäuse der Leuchte heraus ist gemäß einer bevorzugten Ausgestaltung vorgesehen, daß die Reflexionsfläche des weiteren Reflektors (Innenreflektors) gegenüber der Achse der Leuchte einen Neigungswinkel aufweist, der kleiner ist als 85°.For effective heat dissipation from the housing of the luminaire, it is provided according to a preferred embodiment that the reflection surface of the further reflector (inner reflector) has an angle of inclination with respect to the axis of the luminaire that is less than 85 °.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. Es zeigt:

Fig. 1
einen Schnitt in Richtung der optischen Achse einer Leuchte gemäß der Linie I-I aus Fig. 2 und
Fig. 2
einen Schnitt senkrecht zur optischen Achse der Leuchte gemäß Linie II-II aus Fig. 1.
An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. It shows:
Fig. 1
a section in the direction of the optical axis of a lamp along the line II of Fig. 2 and
Fig. 2
a section perpendicular to the optical axis of the lamp according to line II-II of Fig. 1st

Die in den Figuren gezeigte Leuchte 10 weist ein Gehäuse 12 mit einer Gehäusewand 14 auf.The lamp 10 shown in the figures has a housing 12 with a housing wall 14.

Die Vorderseite der Leuchte 10 ist mit dem Bezugszeichen 16 versehen, d.h. die Strahlungsrichtung der Leuchte 10 weist in Richtung des Pfeiles S. Hieraus ergeben sich die in den Ansprüchen verwendeten Begriffe "vorne" und "hinten".The front of the lamp 10 is provided with the reference number 16, i.e. the direction of radiation of the lamp 10 points in the direction of the arrow S. This results in the terms “front” and “rear” used in the claims.

Im Gehäuse 12 ist ein Kaltlichtreflektor 18 befestigt. Der Kaltlichtreflektor ist als solches bekannt und reflektiert Licht im sichtbaren Bereich des elektromagnetischen Spektrums, während Infrarotstrahlung (und ggf. auch Rotanteile der Strahlung) vom Kaltlichtreflektor 18 durchgelassen werden. Die Infrarotstrahlen sind in Fig. 1 durch gestrichelte Linien angedeutet und mit dem Bezugszeichen R gekennzeichnet.A cold light reflector 18 is fastened in the housing 12. The cold light reflector is known as such and reflects light in the visible region of the electromagnetic spectrum, while infrared radiation (and possibly also red components of the radiation) are let through by the cold light reflector 18. The infrared rays are indicated in FIG. 1 by dashed lines and identified by the reference symbol R.

Eine Lichtquelle 20 mit einer Wendel 22 und einem Glaskolben 24 ist so angeordnet, daß die Wendel 22 etwa im Brennpunkt des Kaltlichtreflektors 18 positioniert ist.A light source 20 with a filament 22 and a glass bulb 24 is arranged such that the filament 22 is positioned approximately at the focal point of the cold light reflector 18.

Die Lichtquelle 20 weist einen verjüngten Hals 26 auf, der mittels zweier Stecker 28 an einer Fassung 30 befestigbar ist. Die beiden Stecker 28 werden in Löcher 38 gemäß Fig. 1 geschoben.The light source 20 has a tapered neck 26 which can be fastened to a socket 30 by means of two plugs 28. The two plugs 28 are pushed into holes 38 according to FIG. 1.

Hinter dem Kaltlichtreflektor 18 ist ein weiterer Reflektor 32 angeordnet. Der Begriff "hinter" bezieht sich auf die Strahlungsrichtung S der Leuchte, welche nach vorne weist. Der weitere Reflektor 32 wird weiter unten näher beschrieben. An ihm ist die Fassung 30 befestigt, so daß die Lichtquelle 20 und insbesondere deren verjüngter Hals 26 nicht in Berührung mit dem Kaltlichtreflektor 18 oder einem anderen Bauteil der Leuchte steht.A further reflector 32 is arranged behind the cold light reflector 18. The term "behind" refers to the direction of radiation S of the lamp, which points forward. The further reflector 32 is described in more detail below. The holder 30 is attached to it, so that the light source 20 and in particular its tapered neck 26 is not in contact with the cold light reflector 18 or another component of the lamp.

Wie der Fig. 2 zu entnehmen ist, ist der Reflektor 32 über zwei diametral gegenüberliegende Stege 34 mit der Gehäusewand 14 mechanisch und wärmeleitend verbunden.As can be seen in FIG. 2, the reflector 32 is mechanically and thermally conductively connected to the housing wall 14 via two diametrically opposite webs 34.

Gemäß Fig. 1 ist im Hals des Kaltlichtreflektors 18 eine in Bezug auf die optische Achse A der Leuchte 10 rotationssymmetrische Öffnung 36 ausgebildet, durch die der Hals 26 der Lichtquelle 20 mittig durchragt.According to FIG. 1, an opening 36, which is rotationally symmetrical with respect to the optical axis A of the lamp 10, is formed in the neck of the cold light reflector 18, through which the neck 26 of the light source 20 projects in the center.

Die Reflektionsfläche 40 des Infrarotreflektors 32 ist in Bezug auf die optische Achse A der Leuchte so geneigt, daß mit hohem Wirkungsgrad einfallende Infrarotstrahlung R zur Innenfläche 14' der Gehäusewand 14 gelenkt wird. Die von der Lichtquelle 20 erzeugte Infrarotstrahlung wird damit größtenteils in die Gehäusewand 14 eingeleitet, welche somit den Großteil der durch Infrarotstrahlung erzeugten Wärme aufnimmt. Diese Wärme wird durch Konvektion abgeführt. Hierzu ist zwischen dem Infrarotreflektor 32 und der Gehäusewand 14 eine im wesentlichen um den gesamten Umfang der Leuchte umlaufende Öffnung 42 (die nur durch die Stege 34 unterbrochen ist) vorgesehen. Weiterhin sind an der Vorderseite 16 der Leuchte 10 ebenfalls benachbart der Gehäusewand 14 in der Vorderwand eine Vielzahl von Öffnungen 44 vorgesehen, so daß Luft in Richtung der Pfeile P₁ in das Innere des Gehäuses eintreten kann und nahe der Innenseite 14' an der Gehäusewand 14 vorbeiströmt, um durch die Öffnungen 42 nach hinten weiterzuströmen. Im hinteren Abschnitt der Leuchte (d.h. am der Strahlungsrichtung S gemäß Fig. 1 entgegengesetzten Ende der Leuchte, welches in der Figur nicht im einzelnen dargestellt ist) sind entsprechende Öffnungen vorgesehen, so daß die erhitzte Luft in Richtung der Pfeile P₁ aus dem Gehäuse 12 austreten kann. Aufgrund der in Fig. 1 näher dargestellten Formgebung des Reflektors 32 wird der Luftzug durch das Gehäuse 12 gefördert. Weiterhin tritt in Richtung der Pfeile P₂ Luft durch die Öffnung des Kaltlichtreflektors 18 an der Vorderseite 16 und strömt durch die Öffnung 36 im Hals des Kaltlichtreflektors 18 weiter in Richtung der Pfeile P₂. Die vorstehend beschriebenen Luftströmungen treten mit hoher Konvektionswirkung insbesondere dann auf, wenn die Achse A der Leuchte 10 vertikal ausgerichtet ist, d.h. die Leuchte nach unten abstrahlt und die Strahlungsrichtung S entgegen der Schwerkraft gerichtet ist.The reflection surface 40 of the infrared reflector 32 is inclined with respect to the optical axis A of the lamp in such a way that infrared radiation R incident with high efficiency is directed to the inner surface 14 'of the housing wall 14. The infrared radiation generated by the light source 20 is thus largely introduced into the housing wall 14, which thus absorbs the majority of the heat generated by infrared radiation. This heat is dissipated by convection. For this purpose, an opening 42 (which is only interrupted by the webs 34) is provided between the infrared reflector 32 and the housing wall 14, essentially around the entire circumference of the lamp. Furthermore, a plurality of openings 44 are also provided on the front 16 of the lamp 10 adjacent to the housing wall 14 in the front wall, so that air can enter the interior of the housing in the direction of arrows P 1 and flows past the housing wall 14 near the inside 14 ' to continue flowing through the openings 42 to the rear. Corresponding openings are provided in the rear section of the lamp (ie at the end of the lamp opposite the radiation direction S according to FIG. 1, which is not shown in detail in the figure), so that the heated air emerges from the housing 12 in the direction of the arrows P 1 can. Due to the shape of the reflector 32 shown in more detail in FIG. 1, the draft is conveyed through the housing 12. Furthermore occurs in the direction of arrows P₂ air through the opening of the cold light reflector 18 on the front 16 and flows through the opening 36 in the neck of the cold light reflector 18 further in the direction of the arrows P₂. The air currents described above occur with a high convection effect in particular when the axis A of the lamp 10 is oriented vertically, ie the lamp emits downwards and the direction of radiation S is directed against gravity.

Der Infrarotreflektor 32 wirkt nicht nur als mechanische Fassung für die Lichtquelle 20, sondern auch als Kühlvorrichtung für die sogenannte Quetschungsstelle der Lichtquelle 20. Die Temperatur im kritischen Halsbereich der Lichtquelle bleibt auf relativ geringen Werten, obwohl die Seitenwandungen der Leuchte 10 keine Öffnungen aufweisen.The infrared reflector 32 acts not only as a mechanical socket for the light source 20, but also as a cooling device for the so-called pinching point of the light source 20. The temperature in the critical neck region of the light source remains at relatively low values, although the side walls of the lamp 10 have no openings.

Der Infrarotreflektor 32 ist so geformt, daß die an ihm reflektierten Anteile der Infrarotstrahlung nicht wieder zur Lichtquelle zurückgelangen, sondern im wesentlichen auf die Gehäusewand 14 der Leuchte gelenkt werden. Die Lichtquelle wird insgesamt nicht unnötig erhitzt. Die in Richtung der Pfeile P₂ eintretende, relativ kühle Luft bewirkt beim Durchgang durch die Öffnung 36, welche an dieser Stelle aufgrund des verringerten Öffnungsquerschnittes wie eine Düse wirkt, eine wirksame Abkühlung im kritischen Bereich des Halses 26 der Lichtquelle 20.The infrared reflector 32 is shaped such that the portions of the infrared radiation reflected on it do not return to the light source, but are essentially directed onto the housing wall 14 of the lamp. Overall, the light source is not heated unnecessarily. The entering in the direction of arrows P₂, relatively cool air causes an effective cooling in the critical area of the neck 26 of the light source 20 when passing through the opening 36, which acts like a nozzle at this point due to the reduced opening cross section.

Durch die angegebene Neigung der Reflexionsfläche 40 des Infrarotreflektors 32 in bezug auf die optische Achse A, welche geringer ist als 75°, bevorzugt geringer als 85°, steigt die warme Luft in Richtung der Pfeile P₂ über die Reflexionsfläche 40 und tritt durch die Öffnungen 42 seitlich des Infrarotreflektors 32.Due to the specified inclination of the reflection surface 40 of the infrared reflector 32 with respect to the optical axis A, which is less than 75 °, preferably less than 85 °, the warm air rises in the direction of the arrows P 2 over the reflection surface 40 and passes through the openings 42 to the side of the infrared reflector 32.

Der Infrarotreflektor 32 nimmt nur einen geringen Teil der Wärmeenergie auf und führt diesen auch direkt über die gut wärmeleitend ausgebildeten Stege 34 an die Gehäusewand 14 ab. Die Gehäusewand 14 wird nicht nur durch Wärmeabgabe an die äußere Luft abgekühlt, sondern insbesondere auch durch die in Richtung der Pfeile P₁ und P₂ an der Wand entlang streichende Luftströmung.The infrared reflector 32 absorbs only a small part of the thermal energy and also dissipates it directly to the housing wall 14 via the webs 34, which have good heat-conducting properties. The housing wall 14 is cooled not only by heat being given off to the outside air, but in particular also by the air flow flowing along the wall in the direction of the arrows P 1 and P 2.

Da der Infrarotreflektor 32, wie beschrieben, relativ kalt bleibt, entsteht ein erheblicher Temperaturgradient von der Lichtquelle 20 zum Infrarotreflektor 32. Somit wird vom Hals 26 der Lichtquelle 20 Wärme mit hohem Wirkungsgrad auch in den Infrarotreflektor 32 abgeführt, der diese Wärme wiederum über die bügelförmigen Stege 34 in die Gehäusewand 14 ableitet, welche wie beschrieben insbesondere durch Konvektion abgekühlt wird.Since the infrared reflector 32 remains relatively cold, as described, there is a considerable temperature gradient from the light source 20 to the infrared reflector 32 the light source 20 also dissipates heat with high efficiency into the infrared reflector 32, which in turn dissipates this heat via the bow-shaped webs 34 into the housing wall 14, which, as described, is cooled in particular by convection.

In die Leuchte gemäß den Fig. 1 und 2 kann ein Transformator (nicht gezeigt) eingebaut werden. Dieser wird hinter dem Infrarotreflektor 32 angeordnet und kann insbesondere an den Stegen 34 befestigt werden. Dabei ist der Infrarotreflektor 32 so groß bemessen, daß der Transformator von unten (gemäß Fig. 1) auch bei weggedachtem Kaltlichtreflektor 18 nicht oder nur zu einem geringen Teil zu sehen ist. Dadurch können die Infrarotstrahlen den Transformator nicht erreichen und die erwärmte Luft strömt durch die Öffnungen 42 am Transformator vorbei, ohne diesen nachteilig aufwärmen zu können.1 and 2, a transformer (not shown) can be installed in the lamp. This is arranged behind the infrared reflector 32 and can in particular be attached to the webs 34. The infrared reflector 32 is dimensioned so large that the transformer cannot be seen from below (according to FIG. 1), or only to a small extent, even when the cold light reflector 18 is removed. As a result, the infrared rays cannot reach the transformer and the heated air flows through the openings 42 past the transformer without being able to heat it up disadvantageously.

Claims (6)

  1. A lamp (10) comprising a housing (12) in which a cold light reflector (18) and a socket (30) for a light source (20) are arranged, another reflector (32 reflecting infrared radiation (R) being disposed behind the cold light reflector (18) so that it reflects the incident infrared radiation (R) on to the inner side (14') of the wall (14) of the housing,
    characterized in that the socket (30) of the light source (20) is fixed to the other reflector (32), the light source (20) or a member (26) connected to the same projects freely through a central opening (36) in the cold light reflector (18), and that the housing has openings (42, 44) in the front and in the back.
  2. The lamp as claimed in claim 1, characterized in that the other reflector (32) is connected heat-conductively to the housing wall (14).
  3. The lamp as claimed in claim 2, characterized in that the other reflector (32) is connected heat-conductively to the housing wall (14) by at least one web (34).
  4. The lamp as claimed in any one of the preceding claims, characterized in that an opening (42) is provided between the other reflector (32) and the housing wall (14) for passage of air.
  5. The lamp as claimed in any one of the preceding claims, characterized in that the reflecting surface (40) of the other reflector (32) is inclined at an angle of less than 85° with respect to the axis (A) of the lamp (10).
  6. The lamp as claimed in any one of the preceding claims, characterized in that a transformer is arranged behind the other reflector (32) in such a way that it is not visible, or only partly so, from the front of the lamp (10) when the cold light reflector (18) is removed.
EP90121178A 1990-03-14 1990-11-06 Lighting fixture Expired - Lifetime EP0446423B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4008124A DE4008124A1 (en) 1990-03-14 1990-03-14 LAMP
DE4008124 1990-03-14

Publications (2)

Publication Number Publication Date
EP0446423A1 EP0446423A1 (en) 1991-09-18
EP0446423B1 true EP0446423B1 (en) 1994-07-27

Family

ID=6402169

Family Applications (1)

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EP90121178A Expired - Lifetime EP0446423B1 (en) 1990-03-14 1990-11-06 Lighting fixture

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US (1) US5138541A (en)
EP (1) EP0446423B1 (en)
AT (1) ATE109267T1 (en)
DE (2) DE4008124A1 (en)
DK (1) DK0446423T3 (en)
ES (1) ES2057330T3 (en)

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Also Published As

Publication number Publication date
ATE109267T1 (en) 1994-08-15
DE4008124A1 (en) 1991-09-19
DE59006621D1 (en) 1994-09-01
US5138541A (en) 1992-08-11
EP0446423A1 (en) 1991-09-18
DK0446423T3 (en) 1994-10-31
ES2057330T3 (en) 1994-10-16

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