EP1845303A1 - Lamp with plastic reflectors - Google Patents

Lamp with plastic reflectors Download PDF

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Publication number
EP1845303A1
EP1845303A1 EP20070007524 EP07007524A EP1845303A1 EP 1845303 A1 EP1845303 A1 EP 1845303A1 EP 20070007524 EP20070007524 EP 20070007524 EP 07007524 A EP07007524 A EP 07007524A EP 1845303 A1 EP1845303 A1 EP 1845303A1
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EP
European Patent Office
Prior art keywords
light
luminaire
carrier element
directing
luminaire according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20070007524
Other languages
German (de)
French (fr)
Other versions
EP1845303B1 (en
Inventor
Manfred DÖRING
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.)
Osram SBT GmbH
Original Assignee
Siteco Beleuchtungstechnik GmbH
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Filing date
Publication date
Application filed by Siteco Beleuchtungstechnik GmbH filed Critical Siteco Beleuchtungstechnik GmbH
Publication of EP1845303A1 publication Critical patent/EP1845303A1/en
Application granted granted Critical
Publication of EP1845303B1 publication Critical patent/EP1845303B1/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
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/104—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening using feather joints, e.g. tongues and grooves, with or without friction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • 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
    • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
    • 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
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • 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
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Definitions

  • the invention relates to a lamp having at least partially plastic elements in the form of a reflector or other light-directing element, such as a light-diffusing screen.
  • plastic elements in lighting construction is not only particularly cost-effective, but also has the advantage that many forms are easy to implement.
  • transparent or at least partially transparent plastics In addition, light-directing properties of the luminaire elements can be realized in order to produce special optical effects.
  • the plastic elements can also serve as reflectors, for example by a suitable coating.
  • FIG. 1 A plastic light-directing element in the form of a reflector according to the prior art is shown in FIG.
  • the lines represent the shape of the light-directing element at room temperature.
  • Object of the present invention is to provide a luminaire of the aforementioned types, which reduces the problem of thermal deformation and warp as much as possible.
  • a luminaire with a carrier element on which at least one heat-generating operating means, such as in particular a ballast, and / or a luminous means of the luminaire is arranged, and at least one light-directing element made of plastic, in particular of a thermoplastic, wherein the carrier element and the light-directing element adjoin one another in a connection region and, during operation of the luminaire, the carrier element and the light-directing element assume different temperatures.
  • operation of the luminaire is meant stationary operation, i. at a time after the lamp has been switched on, when the warm-up phase has been completed and all luminaire components have reached their final operating temperature.
  • the invention is based on the recognition that the thermal deformations and distortions are induced by the fact that the corresponding plastic component is exposed to different temperature ranges. Since the thermal expansion of the plastic depends on the temperature, a temperature gradient has the effect that the corresponding plastic component loses its shape because it expands differently at different locations. In particular, longitudinally extending elements such as lampshades and reflectors of elongated luminaires tend to bend lengthwise.
  • the connecting region between the support element and the light-directing element made of plastic, such as a reflector or a lampshade, it has been possible to keep the plastic element on a uniform temperature range despite the heating by the resources of the lamp. Although the plastic elements can expand, they retain their shape due to the uniform temperature distribution in the element. This also preserves the optical properties for directing the light.
  • the inventive reduction of the heat flow between the carrier element and the light-directing element can be achieved in one embodiment, for example, by limiting the contact area between the carrier element and the light-directing element to at most 2%, preferably to at most 1% of the surface of the light-directing element. Since the heat flow between two elements is proportional to the size of the contact surface, the heat flow can be reduced in this way.
  • thermal insulation for example of a foam material, may also be provided between the carrier element and the light-directing element.
  • the carrier element and the light-directing element are connected to one another via a sliding guide.
  • the sliding as can be used in particular in longitudinally extending lights, has the advantage that the support member and the light-directing plastic element can expand independently and no tension between the two elements occur because the expanding elements in the Sliding guide can shift against each other.
  • the carrier element comprises two projections, in which two complementary receptacles of the light-directing element are inserted in order to connect the carrier element with the light-directing element.
  • the two projections in the carrier element may in particular be two slide rails.
  • the light-directing element can be reliably fixed to the support member, without a large contact surface for the connection of the two elements is necessary.
  • the projections and the light directing elements may adjoin one another along narrow contact surfaces, ideally only along one edge. The heat flow, which is transmitted via the contact surface, can thus be reduced to a minimum.
  • At least a part of the carrier element is in a solid angle region between the luminous means of the luminaire and the light-directing element arranged.
  • that part of the light-directing element is covered by the carrier element, which is closest to the light source.
  • This embodiment has the advantage that the carrier element shields the heat radiation emitted by the light source in the direction of the light-directing element.
  • the space between the carrier element and the light-directing element is in particular dimensioned such that the overlying part of the light-directing element is not heated by thermal radiation from the carrier element. In this way, a strong warming of the lamp closest to the parts of the light-directing element, as formed by thermal radiation of the lamp can be prevented.
  • the slide rails which the support member with the light-directing Connect element, be provided with recesses. Through these recesses, air can circulate and provide cooling of the light-directing element.
  • a roof reflector is further attached to the carrier element, which is located between the lamp and the carrier element.
  • the roof reflector in addition to the purely lighting function also has the advantage that it shields the support member from heat radiation of the bulb. In this way, the heating of the support element itself can be reduced.
  • the carrier element may also be formed from plastic, in particular from a thermoplastic.
  • the roof reflector is connected via a sliding guide with the carrier element.
  • the roof reflector and the support member can expand independently, without causing distortion or distortion of the components.
  • lubricants to assist the movement of the components against each other.
  • Suitable lubricants are especially soft soap, Plexiklar or D96.
  • the lubricants have the special property of being transparent or slightly milky drying and having a poor thermal conductivity.
  • the sliding guide can also be partially interrupted in order to reduce the contact surfaces. By this measure, as well as the lubricants also cracking noises can be prevented, which would otherwise arise during thermal expansion and the associated movement of the components against each other.
  • an at least partially light-transparent luminous cover is furthermore provided on the support element, which defines a closed spatial region together with the support element in a cross section through the luminous means, in which the luminous means is arranged.
  • This illuminant cover has the primary task to achieve a lighting effect, for example, by refractive, light-scattering and / or reflective structures on the Leuchtkarabdekkung.
  • the luminous means cover is also connected to the carrier element via a sliding guide, so that these elements can expand independently of one another during heating without causing any distortion.
  • the light-emitting device cover can also be made of plastic, in particular of a thermoplastic.
  • the illuminant cover is arranged opposite the illuminant such that it is approximately the same distance ( ⁇ 20%) to the illuminant cover in a cross-section perpendicular to a longitudinal extent of the illuminant or in spherical geometry of the bulb along all directions.
  • the light directing elements of the invention may have light reflecting and / or refractive structures.
  • light-refracting structures in particular line-shaped prism elements, can be arranged on the surface of the light-directing elements.
  • a desired shield for the lamp can be generated.
  • the surface of the light-directing elements can also be matt or mirror polished mirrored to act as a reflector of the lamp.
  • the light-directing element can have a light-scattering structure completely or partially in order to change the lighting effect of the luminaire. Details of the refractive structures on the light directing elements and on the illuminant cover are in the German patent application 10 2006 017 255.8 described herein by way of reference.
  • the embodiments of the invention shown in the figures are lamps which extend in a longitudinal direction and are operated with one or more fluorescent tubes as lighting means. Such lights can be used both as individual lights as well as one behind the other in the form of a light strip. The lights may be mounted either directly on the ceiling or in a preferred embodiment as pendant lights, i. suspended from the ceiling.
  • Figures 2 to 6 show cross-sections in a sectional plane perpendicular to the Leksserstrekkung the lamp. There are shown various embodiments of the lamp.
  • a luminaire generally in the shape of a downwardly-opening channel.
  • the light exit opening of the luminaire points downwards.
  • the gutter is essentially composed of three components.
  • a symmetrically shaped support member 2 is provided, on which the electrical equipment of the lamp (not shown in the figure) and the lighting means 4 are mounted in the form of a fluorescent tube.
  • the fluorescent tube is connected at the front and the rear end via sockets 5 directly or indirectly (eg via a housing 3) with the carrier element 2.
  • a plurality of luminous means for example a plurality of juxtaposed fluorescent tubes, are provided, as shown in FIGS. 4 and 6.
  • the support member 2 may be made of plastic (e.g., a thermoplastic such as PMMA (polymethyl methacrylate) or PC (polycarbonate)) or metal, in particular, an aluminum extrusion or sheet steel.
  • plastic e.g., a thermoplastic such as PMMA (polymethyl methacrylate) or PC (polycarbonate)
  • metal in particular, an aluminum extrusion or sheet steel.
  • a two-part housing 3 is mounted in the electrical equipment, such as a ballast, (not shown in the figures) can be accommodated.
  • the operating means may be in thermal contact with the carrier element 2.
  • thermoplastic As a material, a thermoplastic is provided in this embodiment, which is formed by extrusion. As a plastic material PMMA or PC is particularly suitable.
  • the light-directing elements 6 are held on the carrier element via a type of sliding guide.
  • two projections 8 and 10 are provided on the carrier element 2 for each of the two light-guiding elements 6, which form a kind of slide rail lengthwise.
  • the light-directing element 6 is slid lengthwise.
  • two receptacles 12 and 14 are provided on the light-directing element 6, which engage on the projections 8 and 10.
  • the projection 8 abuts against the receptacle 12 on two surfaces.
  • the receptacle 12 surrounds the projection 8 from two sides.
  • the projection 10 abuts against the receptacle 14 or on the light-directing element 6 likewise at two contact surfaces.
  • the projection 10 has two short legs at the end facing the light directing element 6 on.
  • a leg abuts against the receptacle 14 over a narrow area.
  • the second limb bears against the light-directing element 6 only along one edge.
  • fewer contact surfaces between the projections 8 and 10 and the light-directing element 6 may be provided. In particular, three contact surfaces would suffice for each one light-directing element 6.
  • the contact surface must be kept as low as possible.
  • the contact surfaces between the projections 8 and 10 and the receptacles 12 and 14 form an area which is less than 0.5% of the total surface area of the light-directing element 6.
  • FIG. 2 shows the heat distribution in the carrier element 2 and the light-directing element 6.
  • the support member is at a relatively high temperature (between about 65 ° C and 70 ° C), because it by both the illuminant 4 and by electrical equipment such as the ballast (not shown), which are arranged thereon is heated.
  • the heat flow to the light directing element 6 is reduced to a minimum due to the small contact surfaces between the projections 8 and 10 and the receptacles 12 and 14.
  • the temperature is in the range between about 23 ° C and 28 ° C.
  • the connection region extends in the light directing element less than about 2 cm from each side of a contact surface between the support member and the light directing element.
  • the already described effect is that the plastic element expands only uniformly but no distortion, in particular no bending along its longitudinal extent has. Even if the carrier element 2 expands more strongly in relation to the light-directing element 6, no tension occurs because the elements can move relative to one another along the projections 8 and 10 formed as slide rails and the receptacles 12 and 14, respectively.
  • a lubricant is provided in the contact surfaces, such as soft soap, Plexiklar or D96, to assist the movement of the components against each other.
  • the projections 8 and 14 or the receptacles 10 and 12 are arranged so that a portion 7 of the light-guiding element 6 is shielded by the carrier element 2 from the heat radiation of the luminous means.
  • the partial region 7 is the partial region of the light-directing element which is closest to the light-emitting device 4. This prevents that the portion 7 is heated by heat radiation stronger than the other areas of the light-directing material 6. Thus, the formation of an uneven temperature distribution in the light-directing element 6 is prevented by this measure.
  • a roof reflector 16 is also disposed above the light-emitting means 4.
  • the roof reflector 16 primarily serves the purpose of reflecting the light, which is emitted by the lighting means in the direction of the carrier element, in the direction of the light exit opening of the luminaire and / or on the light-directing elements 6.
  • it also fulfills the task of protecting the carrier element from the heat radiation that is emitted by the lighting device in the direction of the carrier element.
  • the heating of the carrier element can reduce the operation of the luminaire, in particular in the part which is closest to the luminous means.
  • the roof reflector 16 is similar to the light-directing elements also held in a sliding guide 18 on the support element. This sliding guide 18 allows that the roof reflector 16 can extend thermally, in particular in the longitudinal direction, independently of the support element 2.
  • FIGS 4 to 6 show alternative embodiments of the lamp, in which case the housing 3 and the sockets 5 are not shown.
  • FIG. 4 shows an embodiment which has a wider roof reflector 16 'compared to the embodiment according to FIG. In this embodiment, two lamps 4 are further provided. Due to the wider roof reflector 16 ', the carrier element 6 is shielded over almost the entire width. In contrast, in the narrower roof reflector 16, as shown in Figure 3, only a portion of the support member 6 is shielded. In addition to the roof reflector 16, light may be incident on the support member, e.g. be discharged at a partially transparent support member of this outward.
  • FIGS. 5 and 6 show two embodiments of the luminaire according to the invention which, in addition to the embodiments according to FIGS. 3 and 4, additionally have a luminous means cover 20.
  • the illuminant cover 20, which also constitutes a light-directing element, is made of an at least partially transparent plastic.
  • the illuminant cover 20 completely surrounds the illuminant in a cross section perpendicular to the longitudinal extent of the luminous means 4 together with the carrier element 2 or the roof reflector 16 or 16 '. It serves primarily the lighting task to produce a shield to prevent glare from the lamp.
  • the illuminant cover 20 is hooked into two hooks 22 on the carrier element.
  • an outwardly directed projection 24 of length is respectively provided at the two upper edges of the lamp cover 20, which in the hook 22nd extends.
  • the hooks 22 also extend over the entire length of the light-directing element 6. This connection also acts as a slide, so that the light-emitting device cover 20 can expand independently of the carrier element 2 under the influence of heating by the light source (s) that there is tension or warping between the components.
  • the hooks 22 may also be provided with recesses over part of the longitudinal extension of the luminaire.
  • an additional aperture 26 is inserted on the side of the illuminant which faces the light exit surface.
  • the aperture 26 is inserted into two groove-shaped receptacles 28 in the interior of the illuminant cover 20. Also, this connection between the diaphragm 26 and a groove-shaped receptacle 28 acts in the manner of a slide rail to prevent thermal distortion of the two components.
  • the aperture 26 may be a high-gloss metal element, which covers the lamp down to glare. But it can also be a partially diffuse reflective material, which also provides a glare.
  • the light-emitting device cover 20 is, as shown for example in FIG. 5, arranged around the light source 4 such that it occupies approximately the same distance from the light source in the radial direction from the light source 4. As a result, the heating of the Leuchtstoffabdekkung is evenly distributed over the light source cover by thermal radiation, so that the lamp cover a substantially uniform temperature distribution (.DELTA.T ⁇ 20K) assumes.
  • longitudinally extending prism elements 30 are provided on the light-directing elements 6, which form a triangle in cross-section perpendicular to the longitudinal direction of the luminaire. These worry for a refraction of light, so that a uniform light output of the outgoing light beam from the element 6 light rays is achieved.
  • the light-directing element may also be formed, for example, as a reflector which is partially or completely mirrored, or as a light-diffusing element which is matt-transparent.
  • the illuminant cover 20 in the embodiments of FIGS. 5 and 6 have similar prism elements as the light-directing elements 6, in order likewise to provide refraction of the light transmitted through the illuminant cover.
  • the invention is not limited to longitudinally extending lights.
  • the features of the invention can also be applied to other geometries, such as round luminaires with spherical or annular bulbs.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The light has a carrier unit (2) at which a heat generating operational unit and/or an illuminant (4) of the light are arranged, and a light-guiding element (6) made of plastic e.g.polycarbonate. The carrier unit and the light-guiding element are joined together within a connecting area (8). The connecting area limits heat flow between the carrier unit and the light-guiding element in such a manner that the light-guiding element adopts temperature distribution outside of the connecting area during the operation of the light.

Description

Die Erfindung betrifft eine Leuchte, die wenigstens teilweise Kunststoffelemente in Form eines Reflektors oder eines sonstigen lichtlenkenden Elements, wie einen lichtstreuenden Schirm, aufweist.The invention relates to a lamp having at least partially plastic elements in the form of a reflector or other light-directing element, such as a light-diffusing screen.

Die Verwendung von Kunststoffelementen im Leuchtenbau ist nicht nur besonders kostengünstig, sondern weist darüber hinaus den Vorteil auf, daß viele Formen einfach zu realisieren sind. Bei der Verwendung von transparenten oder wenigstens teilweise transparenten Kunststoffen lassen sich darüber hinaus lichtlenkende Eigenschaften der Leuchtenelemente realisieren, um besondere optische Effekte hervorzubringen. Die Kunststoffelemente können jedoch auch als Reflektoren, z.B. durch eine geeignete Beschichtung, dienen.The use of plastic elements in lighting construction is not only particularly cost-effective, but also has the advantage that many forms are easy to implement. When using transparent or at least partially transparent plastics In addition, light-directing properties of the luminaire elements can be realized in order to produce special optical effects. However, the plastic elements can also serve as reflectors, for example by a suitable coating.

Einen wesentlichen Nachteil haben jedoch die Kunststoffelemente beim Leuchtenbau. Unter der Einwirkung der Wärme, wie sie durch die Betriebsmittel einer Leuchte und durch das Leuchtmittel selbst erzeugt wird, erweisen sich die Kunststoffelemente als nicht formbeständig. Insbesondere bei länglichen Elementen können Verformungen und Verwerfungen auftreten. Diese geometrischen Veränderungen beeinflussen nicht nur das optische Erscheinungsbild der Leuchte, sondern wirken sich auch negativ auf die lichttechnische Wirkung der Leuchte aus, wenn die verformten Kunststoffteile Reflektoren oder andere lichtlenkende Elemente, wie mit Prismen versehene oder lichtstreuende Elemente, sind.A major disadvantage, however, have the plastic elements in the luminaire. Under the influence of heat, as generated by the resources of a lamp and by the lamp itself, the plastic elements prove to be non-dimensionally stable. Deformations and distortions can occur especially with elongated elements. These geometric changes not only affect the visual appearance of the luminaire, but also have a negative effect on the lighting effect of the luminaire when the deformed plastic parts are reflectors or other light-directing elements, such as prisms or light-scattering elements.

Ein lichtlenkendes Element aus Kunststoff in Form eines Reflektors gemäß dem Stand der Technik ist in Figur 1 dargestellt. Die Linien stellen dabei die Form des lichtlenkenden Elements bei Zimmertemperatur dar. Unter dem Einfluß einer Erwärmung durch das Leuchtmittel und die elektrischen Betriebsmittel, welche insbesondere in der Mitte der Leuchte angeordnet sind, bildet sich eine ungleichmäßige Temperaturverteilung in dem lichtlenkenden Element aus. Dadurch kommt es zu einer Verformung des Reflektors, die in der Figur 1 überzeichnet dargestellt ist.A plastic light-directing element in the form of a reflector according to the prior art is shown in FIG. The lines represent the shape of the light-directing element at room temperature. Under the influence of a heating by the lamp and the electrical equipment, which are arranged in particular in the middle of the lamp, forms a non-uniform temperature distribution in the light-directing element. This leads to a deformation of the reflector, which is shown in the figure 1 overdrawn.

Aufgabe der vorliegenden Erfindung ist es, eine Leuchte der eingangs genannten Arten zur Verfügung zu stellen, welche das Problem der thermischen Verformung und Verwerfung soweit wie möglich reduziert.Object of the present invention is to provide a luminaire of the aforementioned types, which reduces the problem of thermal deformation and warp as much as possible.

Die Aufgabe wird gelöst durch eine Leuchte mit einem Trägerelement, an dem wenigstens ein wärmeerzeugendes Betriebsmittel, wie insbesondere ein Vorschaltgerät, und/oder ein Leuchtmittel der Leuchte angeordnet ist, und wenigstens einem lichtlenkenden Element aus Kunststoff, insbesondere aus einem Thermoplast, wobei das Trägerelement und das lichtlenkende Element in einem Verbindungsbereich aneinander angrenzen und im Betrieb der Leuchte das Trägerelement und das lichtlenkende Element unterschiedliche Temperaturen annehmen. Der Verbindungsbereich ist dabei so ausgebildet, daß ein Wärmestrom zwischen dem Trägerelement und dem lichtlenkenden Element soweit begrenzt wird, daß im Betrieb der Leuchte das lichtlenkende Element außerhalb des Verbindungsbereichs eine Temperaturverteilung annimmt, bei der die größte Temperaturdifferenz höchstens ΔT = 10K beträgt.The object is achieved by a luminaire with a carrier element, on which at least one heat-generating operating means, such as in particular a ballast, and / or a luminous means of the luminaire is arranged, and at least one light-directing element made of plastic, in particular of a thermoplastic, wherein the carrier element and the light-directing element adjoin one another in a connection region and, during operation of the luminaire, the carrier element and the light-directing element assume different temperatures. The connection region is formed so that a heat flow between the support member and the light-directing element is limited so that the light-directing element outside the connection area assumes a temperature distribution during operation of the lamp, wherein the largest temperature difference is at most .DELTA.T = 10K.

Als Betrieb der Leuchte ist dabei der stationäre Betrieb gemeint, d.h. zu einer Zeit nach dem Einschalten der Leuchte, zu der die Aufwärmphase abgeschlossen ist und alle Leuchtenkomponenten ihre endgültige Betriebstemperatur angenommen haben.By operation of the luminaire is meant stationary operation, i. at a time after the lamp has been switched on, when the warm-up phase has been completed and all luminaire components have reached their final operating temperature.

Die Erfindung beruht auf der Erkenntnis, daß die thermischen Verformungen und Verwerfungen dadurch induziert werden, daß das entsprechende Kunststoffbauteil verschiedenen Temperaturbereichen ausgesetzt ist. Da die thermische Ausdehnung des Kunststoffs von der Temperatur abhängt, stellt sich bei einem Temperaturgradienten der Effekt ein, daß das entsprechende Kunststoffbauteil seine Form verliert, weil es sich an verschiedenen Stellen unterschiedlich stark ausdehnt. Insbesondere sich längs erstreckende Elemente wie Leuchtenschirme und Reflektoren von länglichen Leuchten neigen dazu, sich der Länge nach zu verbiegen.The invention is based on the recognition that the thermal deformations and distortions are induced by the fact that the corresponding plastic component is exposed to different temperature ranges. Since the thermal expansion of the plastic depends on the temperature, a temperature gradient has the effect that the corresponding plastic component loses its shape because it expands differently at different locations. In particular, longitudinally extending elements such as lampshades and reflectors of elongated luminaires tend to bend lengthwise.

Durch die besondere Gestaltung des Verbindungsbereichs zwischen den Trägerelement und dem lichtlenkenden Element aus Kunststoff, wie z.B. einem Reflektor oder einem Leuchtenschirm, ist es gelungen, das Element aus Kunststoff auf einem einheitlichen Temperaturbereich trotz der Erwärmung durch die Betriebsmittel der Leuchte zu halten. Die Kunststoffelemente können sich zwar ausdehnen, dennoch behalten sie aufgrund der einheitlichen Temperaturverteilung in dem Element ihre Form. Dadurch bleiben auch die optischen Eigenschaften zur Lichtlenkung erhalten.Due to the special design of the connecting region between the support element and the light-directing element made of plastic, such as a reflector or a lampshade, it has been possible to keep the plastic element on a uniform temperature range despite the heating by the resources of the lamp. Although the plastic elements can expand, they retain their shape due to the uniform temperature distribution in the element. This also preserves the optical properties for directing the light.

Die erfindungsgemäße Verringerung des Wärmestroms zwischen dem Trägerelement und dem lichtlenkenden Element kann in einer Ausführungsform beispielsweise dadurch erzielt werden, daß die Kontaktfläche zwischen dem Trägerelement und dem lichtlenkenden Element auf höchstens 2%, bevorzugt auf höchstens 1% der Oberfläche des lichtlenkenden Elements beschränkt wird. Da der Wärmestrom zwischen zwei Elmenten proportional zu der Größe der Kontaktfläche ist, läßt sich auf diese Weise der Wärmestrom reduzieren. In einer alternativen Ausführungsform kann zwischen dem Trägerelement und dem lichtlenkenden Element auch eine thermische Isolierung beispielsweise aus einem Schaummaterial vorgesehen sein.The inventive reduction of the heat flow between the carrier element and the light-directing element can be achieved in one embodiment, for example, by limiting the contact area between the carrier element and the light-directing element to at most 2%, preferably to at most 1% of the surface of the light-directing element. Since the heat flow between two elements is proportional to the size of the contact surface, the heat flow can be reduced in this way. In an alternative embodiment, thermal insulation, for example of a foam material, may also be provided between the carrier element and the light-directing element.

Bevorzugt sind das Trägerelement und das lichtlenkende Element über eine Gleitführung miteinander verbunden. Die Gleitführung, wie sie insbesondere bei sich längs erstreckenden Leuchten eingesetzt werden kann, hat den Vorteil, daß sich das Trägerteil und das lichtlenkende Element aus Kunststoff unabhängig voneinander ausdehnen können und dabei keine Verspannungen zwischen den beiden Elementen auftreten, weil sich die ausdehnenden Elemente in der Gleitführung gegeneinander verlagern können.Preferably, the carrier element and the light-directing element are connected to one another via a sliding guide. The sliding, as can be used in particular in longitudinally extending lights, has the advantage that the support member and the light-directing plastic element can expand independently and no tension between the two elements occur because the expanding elements in the Sliding guide can shift against each other.

Gemäß einer Ausführungsform umfaßt das Trägerelement zwei Vorsprünge, in die zwei komplementäre Aufnahmen des lichtlenkenden Elements eingesteckt sind, um das Trägerelement mit dem lichtlenkenden Element zu verbinden. Die zwei Vorsprünge im Trägerelement können insbesondere zwei Gleitschienen sein. Mittels der zwei Vorsprünge kann das lichtlenkende Element zuverlässig an dem Trägerelement befestigt werden, ohne daß eine große Kontaktfläche zur Verbindung der beiden Elemente notwendig ist. Insbesondere können die Vorsprünge und die lichtlenkenden Elemente entlang schmaler Kontaktflächen, idealerweise nur entlang einer Kante, aneinander angrenzen. Der Wärmestrom, der über die Kontaktfläche übertragen wird, kann so auf ein Minimum reduziert werden.According to one embodiment, the carrier element comprises two projections, in which two complementary receptacles of the light-directing element are inserted in order to connect the carrier element with the light-directing element. The two projections in the carrier element may in particular be two slide rails. By means of the two projections, the light-directing element can be reliably fixed to the support member, without a large contact surface for the connection of the two elements is necessary. In particular, the projections and the light directing elements may adjoin one another along narrow contact surfaces, ideally only along one edge. The heat flow, which is transmitted via the contact surface, can thus be reduced to a minimum.

Gemäß einer bevorzugten Ausführungsform ist in einem Raumwinkelbereich zwischen dem Leuchtmittel der Leuchte und dem lichtlenkenden Element wenigstens ein Teil des Trägerelements angeordnet. Insbesondere wird derjenige Teil des lichtlenkenden Elements von dem Trägerelement abgedeckt, welche dem Leuchtmittel am nächsten liegt. Diese Ausführungsform hat den Vorteil, daß das Trägerelement die von dem Leuchtmittel abgegebene Wärmestrahlung in Richtung zu dem lichtlenkenden Element abschirmt. Der Raum zwischen dem Trägerelement und dem lichtlenkenden Element ist insbesondere so dimensioniert, daß durch Wärmestrahlung vom Trägerelement der darüberliegende Teil des lichtlenkenden Elements nicht erwärmt wird. Auf diese Weise kann eine starke Aufwärmung der dem Leuchtmittel am nächsten liegenden Teile des lichtlenkenden Elements, wie sie durch Wärmestrahlung des Leuchtmittels entsteht, verhindert werden. Diese Ausführungsform sorgt ergänzend zu der Reduktion des Wärmestroms in den Bauteilen dazu, daß das lichtlenkende Element von dem Leuchtmittel nur gleichmäßig, d.h. ohne einen Temperaturgradienten von mehr als ΔT = 10K, erwärmt wird.According to a preferred embodiment, at least a part of the carrier element is in a solid angle region between the luminous means of the luminaire and the light-directing element arranged. In particular, that part of the light-directing element is covered by the carrier element, which is closest to the light source. This embodiment has the advantage that the carrier element shields the heat radiation emitted by the light source in the direction of the light-directing element. The space between the carrier element and the light-directing element is in particular dimensioned such that the overlying part of the light-directing element is not heated by thermal radiation from the carrier element. In this way, a strong warming of the lamp closest to the parts of the light-directing element, as formed by thermal radiation of the lamp can be prevented. This embodiment, in addition to the reduction of the heat flow in the components to the fact that the light-directing element of the lamp only evenly, that is heated without a temperature gradient of more than ΔT = 10K.

Kann aufgrund geometrischer Gegebenheiten, wie sie durch das Design oder die Baugröße der Leuchte vorgegeben sind, die Höhe des Zwischenraums zwischen dem Trägerelement und dem lichtlenkenden Element nicht ausreichend dimensioniert werden, so können in einer Ausführungsform der Leuchte die Gleitschienen, welche das Trägerelement mit dem lichtlenkenden Element verbinden, mit Ausnehmungen versehen werden. Durch diese Ausnehmungen kann Luft zirkulieren und für Kühlung des lichtlenkenden Elements sorgen.Can due to geometric conditions, as dictated by the design or the size of the lamp, the height of the gap between the support member and the light-directing element are not sufficiently dimensioned, then in one embodiment of the lamp, the slide rails, which the support member with the light-directing Connect element, be provided with recesses. Through these recesses, air can circulate and provide cooling of the light-directing element.

Gemäß einer bevorzugten Ausführungsform ist an dem Trägerelement weiterhin ein Dachreflektor angebracht, der sich zwischen dem Leuchtmittel und dem Trägerelement befindet. Der Dachreflektor hat neben der rein lichttechnischen Funktion auch den Vorteil, daß er das Trägerelement vor einer Wärmestrahlung des Leuchtmittels abschirmt. Auf diese Weise kann auch die Erwärmung des Trägerelements selbst verringert werden. Das Trägerelement kann auch aus Kunststoff, insbesondere aus einem Thermoplast gebildet sein.According to a preferred embodiment, a roof reflector is further attached to the carrier element, which is located between the lamp and the carrier element. The roof reflector in addition to the purely lighting function also has the advantage that it shields the support member from heat radiation of the bulb. In this way, the heating of the support element itself can be reduced. The carrier element may also be formed from plastic, in particular from a thermoplastic.

Vorzugsweise ist der Dachreflektor über eine Gleitführung mit dem Trägerelement verbunden. So können sich auch der Dachreflektor und das Trägerelement unabhängig voneinander ausdehnen, ohne daß es zu Verspannung oder Verwerfungen der Bauteile kommt.Preferably, the roof reflector is connected via a sliding guide with the carrier element. Thus, the roof reflector and the support member can expand independently, without causing distortion or distortion of the components.

Gemäß einer Ausführungsform sind an den Kontaktflächen zwischen den Gleitführungen, d.h. insbesondere an den Kontaktflächen zwischen dem Trägerelement und dem lichtlenkenden Element, Schmierstoffe vorgesehen, um die Bewegung der Bauteile gegeneinander zu unterstützen. Als Schmierstoffe eignen sich besonders Schmierseife, Plexiklar oder D96. Die Schmierstoffe haben die besondere Eigenschaft, transparent oder leicht milchig abtrocknend zu sein sowie eine schlechte Wärmeleitfähigkeit zu besitzen. Alternativ oder ergänzend zu dem Einsatz von Schmiermitteln kann auch die Gleitführung partiell unterbrochen sein, um die Kontaktflächen zu reduzieren. Durch diese Maßnahme können wie bei den Schmiermitteln auch Knackgeräusche verhindert werden, die andernfalls beim thermischen Ausdehnen und der damit verbundenen Bewegung der Bauteile gegeneinander entstehen würden.According to one embodiment, at the contact surfaces between the sliding guides, i. in particular provided on the contact surfaces between the carrier element and the light-directing element, lubricants to assist the movement of the components against each other. Suitable lubricants are especially soft soap, Plexiklar or D96. The lubricants have the special property of being transparent or slightly milky drying and having a poor thermal conductivity. As an alternative or in addition to the use of lubricants, the sliding guide can also be partially interrupted in order to reduce the contact surfaces. By this measure, as well as the lubricants also cracking noises can be prevented, which would otherwise arise during thermal expansion and the associated movement of the components against each other.

Gemäß einer Ausführungsform der Leuchte ist an dem Trägerelement weiterhin eine wenigstens teilweise lichttransparente Leuchtmittelabdeckung vorgesehen, welche zusammen mit dem Trägerelement in einem Querschnitt durch das Leuchtmittel einen geschlossenen Raumbereich definiert, in dem das Leuchtmittel angeordnet ist. Diese Leuchtmittelabdeckung hat vornehmlich die Aufgabe, eine lichttechnische Wirkung zu erzielen, beispielsweise durch lichtbrechende, lichtstreuende und/oder reflektierende Strukturen auf der Leuchtmittelabdekkung. Gemäß einer Ausführungsform der erfindungsgemäßen Leuchte ist auch die Leuchtmittelabdeckung über eine Gleitführung mit dem Trägerelement verbunden, so daß sich diese Elemente bei Erwärmung unabhängig voneinander ausdehnen können, ohne daß es zu Verwerfungen kommt. Die Leuchtmittelabdeckung kann auch aus Kunststoff, insbesondere aus einem Thermoplast, gebildet sein. Vorzugsweise ist die Leuchtmittelabdeckung gegenüber dem Leuchtmittel so angeordnet, daß sie etwa den gleichen Abstand (± 20%) zu der Leuchtmittelabdeckung in einem Querschnitt senkrecht zu einer Längserstreckung des Leuchtmittels aufweist oder bei kugelförmiger Geometrie des Leuchtmittels entlang aller Richtungen aufweist. Auf diese Weise wird die durch Wärmestrahlung vom Leuchtmittel auf die Leuchtmittelabdeckung abgegebene Wärme gleichmäßig an die Leuchtmittelabdeckung abgegeben, so daß sich diese auch gleichmäßig, d.h. ohne einen Temperaturgradienten mit einer Temperaturdifferenz von mehr als ΔT = 20K, bevorzugt ΔT = 10K, erwärmen kann.According to one embodiment of the luminaire, an at least partially light-transparent luminous cover is furthermore provided on the support element, which defines a closed spatial region together with the support element in a cross section through the luminous means, in which the luminous means is arranged. This illuminant cover has the primary task to achieve a lighting effect, for example, by refractive, light-scattering and / or reflective structures on the Leuchtmittelabdekkung. According to one embodiment of the luminaire according to the invention, the luminous means cover is also connected to the carrier element via a sliding guide, so that these elements can expand independently of one another during heating without causing any distortion. The light-emitting device cover can also be made of plastic, in particular of a thermoplastic. Preferably, the illuminant cover is arranged opposite the illuminant such that it is approximately the same distance (± 20%) to the illuminant cover in a cross-section perpendicular to a longitudinal extent of the illuminant or in spherical geometry of the bulb along all directions. In this way, the heat emitted by heat radiation from the lamp onto the lamp cover heat is emitted evenly to the lamp cover, so that they evenly, ie without a temperature gradient with a temperature difference of more than .DELTA.T = 20K, preferably .DELTA.T = 10K, can heat.

Die lichtlenkenden Elemente der Erfindung können lichtreflektierende und/oder lichtbrechende Strukturen aufweisen. Insbesondere können auf der Oberfläche der lichtlenkenden Elemente lichtbrechende Strukturen, insbesondere linienförmige Prismenelemente, angeordnet sein. Durch diese Strukturen läßt sich beispielsweise eine gewünschte Abschirmung für die Leuchte erzeugen. Die Oberfläche der lichtlenkenden Elemente kann auch matt oder hochglänzend verspiegelt sein, um als Reflektor der Leuchte zu wirken. Ferner kann das lichtlenkende Element vollständig oder teilweise eine lichtstreuende Struktur aufweisen, um die lichttechnische Wirkung der Leuchte zu verändern. Einzelheiten zu den lichtbrechenden Strukturen auf den lichtlenkenden Elementen und auf der Leuchtmittelabdeckung sind in der deutschen Patentanmeldung 10 2006 017 255.8 beschrieben, die hierin im Wege der Bezugnahme aufgenommen wird.The light directing elements of the invention may have light reflecting and / or refractive structures. In particular, light-refracting structures, in particular line-shaped prism elements, can be arranged on the surface of the light-directing elements. By these structures, for example, a desired shield for the lamp can be generated. The surface of the light-directing elements can also be matt or mirror polished mirrored to act as a reflector of the lamp. Furthermore, the light-directing element can have a light-scattering structure completely or partially in order to change the lighting effect of the luminaire. Details of the refractive structures on the light directing elements and on the illuminant cover are in the German patent application 10 2006 017 255.8 described herein by way of reference.

Weitere Vorteile und Merkmale der vorliegenden Erfindung werden anhand der nachfolgenden detaillierten Beschreibung einer bevorzugten Ausführungsform erläutert. Die beigefügten Figuren stellen dabei folgendes dar:

Figur 1
ist eine perspektivische Ansicht eines lichtlenkenden Elements einer Leuchte aus Kunststoff nach dem Stand der Technik, welche sich bei Erwärmung verformt.
Figur 2
zeigt einen Querschnitt durch einen Teil einer Leuchte gemäß der Erfindung, wobei unterschiedliche Temperaturbereiche dargestellt sind.
Figur 3
zeigt einen Querschnitt durch eine Leuchte der Erfindung.
Figur 4
zeigt einen Querschnitt durch einen Teil einer zweiten Ausführungsform einer Leuchte gemäß der Erfindung.
Figur 5
zeigt einen Querschnitt durch einen Teil einer dritten Ausführungsform einer Leuchte gemäß der Erfindung.
Figur 6
zeigt einen Querschnitt durch einen Teil einer vierten Ausführungsform einer Leuchte der vorliegenden Erfindung.
Further advantages and features of the present invention will become apparent from the following detailed description of a preferred embodiment. The attached figures represent the following:
FIG. 1
is a perspective view of a light-directing element of a plastic light according to the prior art, which deforms when heated.
FIG. 2
shows a cross section through part of a lamp according to the invention, wherein different temperature ranges are shown.
FIG. 3
shows a cross section through a luminaire of the invention.
FIG. 4
shows a cross section through a part of a second embodiment of a lamp according to the invention.
FIG. 5
shows a cross section through a part of a third embodiment of a lamp according to the invention.
FIG. 6
shows a cross section through a part of a fourth embodiment of a luminaire of the present invention.

Bei den in den Figuren dargestellten Ausführungsformen der Erfindung handelt es sich um Leuchten, die sich in einer Längsrichtung erstrecken und mit einer oder mehreren Leuchtstoffröhren als Leuchtmittel betrieben werden. Derartige Leuchten können sowohl als Einzelleuchten als auch hintereinander in Form eines Lichtbandes eingesetzt werden. Die Leuchten können entweder direkt an der Decke montiert sein oder in einer bevorzugten Ausführungsform als Pendelleuchten, d.h. von der Decke abgehängt, montiert werden.The embodiments of the invention shown in the figures are lamps which extend in a longitudinal direction and are operated with one or more fluorescent tubes as lighting means. Such lights can be used both as individual lights as well as one behind the other in the form of a light strip. The lights may be mounted either directly on the ceiling or in a preferred embodiment as pendant lights, i. suspended from the ceiling.

Die Figuren 2 bis 6 zeigen Querschnitte in einer Schnittebene senkrecht zu der Längserstrekkung der Leuchte. Es sind verschiedene Ausführungsformen der Leuchte dargestellt.Figures 2 to 6 show cross-sections in a sectional plane perpendicular to the Längserstrekkung the lamp. There are shown various embodiments of the lamp.

Bezugnehmend auf Figur 3 ist eine Leuchte gezeigt, die allgemein die Form einer sich nach unten öffnenden Rinne aufweist. Die Lichtaustrittsöffnung der Leuchte weist nach unten. Die Rinne setzt sich im wesentlichen aus drei Bauteilen zusammen. In der Mitte ist ein symmetrisch ausgebildetes Trägerelement 2 vorgesehen, an dem die elektrischen Betriebsmittel der Leuchte (in der Figur nicht dargestellt) und das Leuchtmittel 4 in Form einer Leuchtstoffröhre angebracht sind. Die Leuchtstoffröhre ist an dem vorderen und dem hinteren Ende über Fassungen 5 direkt oder indirekt (z.B. über ein Gehäuse 3) mit dem Trägerelement 2 verbunden.Referring to Figure 3, there is shown a luminaire generally in the shape of a downwardly-opening channel. The light exit opening of the luminaire points downwards. The gutter is essentially composed of three components. In the middle of a symmetrically shaped support member 2 is provided, on which the electrical equipment of the lamp (not shown in the figure) and the lighting means 4 are mounted in the form of a fluorescent tube. The fluorescent tube is connected at the front and the rear end via sockets 5 directly or indirectly (eg via a housing 3) with the carrier element 2.

Neben der dargestellten Ausführungsform mit einem Leuchtmittel sind auch Ausführungsformen möglich, in denen mehrere Leuchtmittel, beispielsweise mehrere nebeneinander angeordnete Leuchtstoffröhren, vorgesehen sind, wie es in den Figuren 4 und 6 dargestellt ist.In addition to the illustrated embodiment with a luminous means, embodiments are also possible in which a plurality of luminous means, for example a plurality of juxtaposed fluorescent tubes, are provided, as shown in FIGS. 4 and 6.

Das Trägerelement 2 kann aus Kunststoff (z.B. aus einem Thermoplast wie PMMA (Polymethylmethacrylat) oder PC (Polycarbonat)) oder aus Metall, insbesondere aus einem Aluminiumstrangpreßprofil oder aus Stahlblech, hergestellt sein.The support member 2 may be made of plastic (e.g., a thermoplastic such as PMMA (polymethyl methacrylate) or PC (polycarbonate)) or metal, in particular, an aluminum extrusion or sheet steel.

Oberhalb des Trägerelements ist ein zweiteiliges Gehäuse 3 angebracht, in dem elektrische Betriebsmittel, wie ein Vorschaltgerät, (in den Figuren nicht dargestellt) untergebracht werden können. Die Betriebsmittel können in thermischen Kontakt mit dem Trägerelement 2 stehen.Above the support element, a two-part housing 3 is mounted in the electrical equipment, such as a ballast, (not shown in the figures) can be accommodated. The operating means may be in thermal contact with the carrier element 2.

An dem Trägerelement 2 schließen sich zu beiden Seiten lichtlenkende Elemente 6 aus Kunststoff an, die in der dargestellten Ausführungsform teilweise lichtdurchlässig ausgebildet sind. Als Material ist bei dieser Ausführungsform ein Thermoplast vorgesehen, der im Extrusionsverfahren geformt wird. Als Kunststoffmaterial eignet sich besonders PMMA oder PC.On the support member 2 close to both sides of light-deflecting elements 6 made of plastic, which are partially transparent in the illustrated embodiment. As a material, a thermoplastic is provided in this embodiment, which is formed by extrusion. As a plastic material PMMA or PC is particularly suitable.

Die lichtlenkenden Elemente 6 werden über eine Art Gleitführung an dem Trägerelement gehalten. Zu diesem Zweck sind an dem Trägerelement 2 für jedes der beiden lichtlenkenden Elemente 6 jeweils zwei Vorsprünge 8 und 10 vorgesehen, die der Länge nach eine Art Gleitschiene bilden. Auf die Gleitschienen 8 und 10 ist das lichtlenkende Element 6 der Länge nach aufgeschoben. Dazu sind an dem lichtlenkenden Element 6 zwei Aufnahmen 12 und 14 vorgesehen, welche an den Vorsprüngen 8 und 10 eingreifen. Der Vorsprung 8 liegt an der Aufnahme 12 an zwei Flächen an. Dabei umgreift die Aufnahme 12 den Vorsprung 8 von zwei Seiten. Der Vorsprung 10 liegt an der Aufnahme 14 bzw. an dem lichtlenkenden Element 6 ebenfalls an zwei Kontaktflächen an. Bei der gezeigten Ausführungsform weist der Vorsprung 10 an dem zum lichtlenkenden Element 6 weisenden Ende zwei kurze Schenkel auf. Ein Schenkel liegt an der Aufnahme 14 über eine schmale Fläche an. Der zweite Schenkel liegt nur entlang einer Kante an dem lichtlenkenden Element 6 an. In anderen Ausführungsformen können auch weniger Kontaktflächen zwischen den Vorsprüngen 8 bzw. 10 und dem lichtlenkenden Element 6 vorgesehen sein. Insbesondere würden auch drei Kontaktflächen für jeweils ein lichtlenkendes Element 6 genügen.The light-directing elements 6 are held on the carrier element via a type of sliding guide. For this purpose, two projections 8 and 10 are provided on the carrier element 2 for each of the two light-guiding elements 6, which form a kind of slide rail lengthwise. On the slide rails 8 and 10, the light-directing element 6 is slid lengthwise. For this purpose, two receptacles 12 and 14 are provided on the light-directing element 6, which engage on the projections 8 and 10. The projection 8 abuts against the receptacle 12 on two surfaces. In this case, the receptacle 12 surrounds the projection 8 from two sides. The projection 10 abuts against the receptacle 14 or on the light-directing element 6 likewise at two contact surfaces. In the illustrated embodiment, the projection 10 has two short legs at the end facing the light directing element 6 on. A leg abuts against the receptacle 14 over a narrow area. The second limb bears against the light-directing element 6 only along one edge. In other embodiments, fewer contact surfaces between the projections 8 and 10 and the light-directing element 6 may be provided. In particular, three contact surfaces would suffice for each one light-directing element 6.

Obgleich es viele Möglichkeiten gibt, die Vorsprünge und die Aufnahmen auszubilden, ist ein konstruktiver Gesichtspunkt sehr wichtig: Insgesamt muß die Kontaktfläche möglichst gering gehalten werden. Bei der gezeigten Ausführungsform bilden die Kontaktflächen zwischen den Vorsprüngen 8 bzw. 10 und den Aufnahmen 12 bzw. 14 eine Fläche, die weniger als 0,5% der Gesamtoberfläche des lichtlenkenden Elements 6 ausmacht.Although there are many ways to form the projections and the receptacles, a constructive aspect is very important: Overall, the contact surface must be kept as low as possible. In the embodiment shown, the contact surfaces between the projections 8 and 10 and the receptacles 12 and 14 form an area which is less than 0.5% of the total surface area of the light-directing element 6.

Durch die Verringerung der Kontaktfläche wie vorhergehend beschrieben, stellt sich der Effekt ein, daß der Wärmestrom von dem Trägerelement 2 zu dem lichtlenkenden Element 6 auf ein Minimum reduziert werden kann. Zur Verdeutlichung wird auf Figur 2 hingewiesen, welche die Wärmeverteilung in dem Trägerelement 2 und dem lichtlenkenden Element 6 zeigt. Im Betrieb der Leuchte befindet sich das Trägerelement auf einer verhältnismäßig hohen Temperatur (zwischen etwa 65°C und 70°C), weil es sowohl durch das Leuchtmittel 4 als auch durch elektrische Betriebsmittel wie das Vorschaltgerät (nicht dargestellt), die daran angeordnet sind, erwärmt wird. Der Wärmestrom zu dem lichtlenkenden Element 6 ist jedoch auf ein Minimum reduziert aufgrund der geringen Kontaktflächen zwischen den Vorsprüngen 8 bzw. 10 und den Aufnahmen 12 bzw. 14. Wie in der Figur 2 dargestellt ist, nimmt das lichtlenkende Element 6 wenigstens außerhalb der unmittelbaren Umgebung um die Kontaktflächen, dem sogenannten Verbindungsbereich, eine gleichmäßige Temperatur an, die sich über das Element hinweg um nicht mehr als etwa ΔT = 7K unterscheidet. In dem gezeigten Beispiel liegt die Temperatur im Bereich zwischen etwa 23°C und 28°C. Der Verbindungsbereich erstreckt sich in dem lichtlenkenden Element weniger als etwa 2 cm von jeder Seite einer Kontaktfläche zwischen dem Trägerelement und dem lichtlenkenden Element.By reducing the contact area as described above, there is an effect that the heat flow from the support member 2 to the light-directing member 6 can be reduced to a minimum. For clarification, reference is made to FIG. 2, which shows the heat distribution in the carrier element 2 and the light-directing element 6. In operation of the lamp, the support member is at a relatively high temperature (between about 65 ° C and 70 ° C), because it by both the illuminant 4 and by electrical equipment such as the ballast (not shown), which are arranged thereon is heated. However, the heat flow to the light directing element 6 is reduced to a minimum due to the small contact surfaces between the projections 8 and 10 and the receptacles 12 and 14. As shown in Figure 2, the light directing element 6 at least outside the immediate vicinity around the contact surfaces, the so-called connection region, a uniform temperature that differs across the element by no more than about ΔT = 7K. In the example shown, the temperature is in the range between about 23 ° C and 28 ° C. The connection region extends in the light directing element less than about 2 cm from each side of a contact surface between the support member and the light directing element.

Durch die gleichmäßige Temperaturverteilung insbesondere in dem lichtlenkenden Element aus Kunststoff stellt sich der bereits beschriebene Effekt ein, daß das Kunststoffelement sich nur gleichmäßig ausdehnt aber keine Verwerfung, insbesondere keine Verbiegung entlang seiner Längserstreckung, aufweist. Auch wenn sich das Trägerelement 2 gegenüber dem lichtlenkenden Element 6 stärker ausdehnt, so kommt es dennoch zu keinen Spannungen, weil die Elemente entlang der als Gleitschienen ausgebildeten Vorsprünge 8 bzw. 10 und der Aufnahmen 12 bzw. 14 sich gegeneinander bewegen können. In einer Ausführungsform der Erfindung ist in den Kontaktflächen ein Schmierstoff vorgesehen, wie Schmierseife, Plexiklar oder D96, um die Bewegung der Bauelemente gegeneinander zu unterstützen.Due to the uniform temperature distribution, in particular in the light-directing element made of plastic, the already described effect is that the plastic element expands only uniformly but no distortion, in particular no bending along its longitudinal extent has. Even if the carrier element 2 expands more strongly in relation to the light-directing element 6, no tension occurs because the elements can move relative to one another along the projections 8 and 10 formed as slide rails and the receptacles 12 and 14, respectively. In one embodiment of the invention, a lubricant is provided in the contact surfaces, such as soft soap, Plexiklar or D96, to assist the movement of the components against each other.

Die Vorsprünge 8 und 14 bzw. die Aufnahmen 10 und 12 sind so angeordnet, daß ein Teilbereich 7 des lichtlenkenden Elements 6 durch das Trägerelement 2 von der Wärmestrahlung des Leuchtmittels abgeschirmt wird. Der Teilbereich 7 ist derjenige Teilbereich des lichtlenkenden Elements, welcher dem Leuchtmittel 4 am nächsten liegt. Dadurch wird verhindert, daß sich der Teilbereich 7 durch Wärmestrahlung stärker als die anderen Bereiche des lichtlenkenden Materials 6 erwärmt wird. Somit wird auch durch diese Maßnahme die Ausbildung einer ungleichmäßigen Temperaturverteilung in dem lichtlenkenden Element 6 verhindert.The projections 8 and 14 or the receptacles 10 and 12 are arranged so that a portion 7 of the light-guiding element 6 is shielded by the carrier element 2 from the heat radiation of the luminous means. The partial region 7 is the partial region of the light-directing element which is closest to the light-emitting device 4. This prevents that the portion 7 is heated by heat radiation stronger than the other areas of the light-directing material 6. Thus, the formation of an uneven temperature distribution in the light-directing element 6 is prevented by this measure.

An dem Trägerelement 2 ist oberhalb des Leuchtmittels 4 ferner ein Dachreflektor 16 angeordnet. Der Dachreflektor 16 dient vornehmlich der Aufgabe, das Licht, welches von den Leuchtmitteln in Richtung zu dem Trägerelement abgegeben wird, in Richtung zur Lichtaustrittsöffnung der Leuchte und/oder auf die lichtlenkenden Elemente 6 zu reflektieren. Dabei erfüllt er zusätzlich auch die Aufgabe, das Trägerelement vor der Wärmestrahlung zu schützen, die von dem Leuchtmittel in Richtung auf das Trägerelement abgegeben wird. Dadurch kann die Erwärmung des Trägerelements den Betrieb der Leuchte, insbesondere in dem Teil, welcher dem Leuchtmittel am nächsten liegt, verringert werden.On the support element 2, a roof reflector 16 is also disposed above the light-emitting means 4. The roof reflector 16 primarily serves the purpose of reflecting the light, which is emitted by the lighting means in the direction of the carrier element, in the direction of the light exit opening of the luminaire and / or on the light-directing elements 6. In addition, it also fulfills the task of protecting the carrier element from the heat radiation that is emitted by the lighting device in the direction of the carrier element. As a result, the heating of the carrier element can reduce the operation of the luminaire, in particular in the part which is closest to the luminous means.

Der Dachreflektor 16 ist ähnlich wie die lichtlenkenden Elemente ebenfalls in einer Gleitführung 18 an dem Trägerelement gehalten. Diese Gleitführung 18 erlaubt es, daß sich der Dachreflektor 16 unabhängig von dem Trägerelement 2 insbesondere in Längsrichtung thermisch ausdehnen kann.The roof reflector 16 is similar to the light-directing elements also held in a sliding guide 18 on the support element. This sliding guide 18 allows that the roof reflector 16 can extend thermally, in particular in the longitudinal direction, independently of the support element 2.

Die Figuren 4 bis 6 zeigen alternative Ausführungsformen der Leuchte, wobei in diesen Figuren das Gehäuse 3 und die Fassungen 5 nicht dargestellt sind.Figures 4 to 6 show alternative embodiments of the lamp, in which case the housing 3 and the sockets 5 are not shown.

Die Figur 4 zeigt eine Ausführungsform, welche gegenüber der Ausführungsform nach Figur 3 einen breiteren Dachreflektor 16' aufweist. In dieser Ausführungsform sind ferner zwei Leuchtmittel 4 vorgesehen. Durch den breiteren Dachreflektor 16' wird das Trägerelement 6 fast über die gesamte Breite abgeschirmt. Im Unterscheid dazu wird bei dem schmäleren Dachreflektor 16, wie er in Figur 3 gezeigt ist, nur ein Teil des Trägerelements 6 abgeschirmt. Neben dem Dachreflektor 16 kann Licht auf das Trägerelement einfallen und z.B. bei einem teilweise transparenten Trägerelement von diesem nach außen abgegeben werden.FIG. 4 shows an embodiment which has a wider roof reflector 16 'compared to the embodiment according to FIG. In this embodiment, two lamps 4 are further provided. Due to the wider roof reflector 16 ', the carrier element 6 is shielded over almost the entire width. In contrast, in the narrower roof reflector 16, as shown in Figure 3, only a portion of the support member 6 is shielded. In addition to the roof reflector 16, light may be incident on the support member, e.g. be discharged at a partially transparent support member of this outward.

Die Figuren 5 und 6 zeigen zwei Ausführungsformen der erfindungsgemäßen Leuchte, die gegenüber den Ausführungsformen nach den Figuren 3 und 4 zusätzlich eine Leuchtmittelabdeckung 20 aufweisen. Die Leuchtmittelabdeckung 20, welche ebenfalls ein lichtlenkendes Element darstellt, ist aus einem wenigstens teilweise transparenten Kunststoff hergestellt. Die Leuchtmittelabdeckung 20 umgibt in einem Querschnitt senkrecht zu der Längserstreckung des Leuchtmittels 4 zusammen mit dem Trägerelement 2 bzw. dem Dachreflektor 16 oder 16' das Leuchtmittel vollständig. Es dient vornehmlich der lichttechnischen Aufgabe zur Erzeugung einer Abschirmung, um eine Blendung durch die Leuchte zu verhindern.FIGS. 5 and 6 show two embodiments of the luminaire according to the invention which, in addition to the embodiments according to FIGS. 3 and 4, additionally have a luminous means cover 20. The illuminant cover 20, which also constitutes a light-directing element, is made of an at least partially transparent plastic. The illuminant cover 20 completely surrounds the illuminant in a cross section perpendicular to the longitudinal extent of the luminous means 4 together with the carrier element 2 or the roof reflector 16 or 16 '. It serves primarily the lighting task to produce a shield to prevent glare from the lamp.

Die Leuchtmittelabdeckung 20 ist in zwei Haken 22 an dem Trägerelement eingehakt. Zu diesem Zweck ist an den beiden oberen Kanten der Leuchtmittelabdeckung 20 jeweils ein nach außen gerichteter Vorsprung 24 der Länge nach vorgesehen, welcher in den Haken 22 hineinreicht. Die Haken 22 erstrecken sich ebenfalls über die ganze Länge des lichtlenkenden Elements 6. Auch diese Verbindung wirkt in der Art einer Gleitschiene, so daß sich die Leuchtmittelabdeckung 20 unabhängig von dem Trägerelement 2 unter Einfluß einer Erwärmung durch das bzw. die Leuchtmittel ausdehnen kann, ohne daß es zu Verspannungen oder Verwerfungen zwischen den Bauteilen kommt. Die Haken 22 können jedoch auch mit Ausnehmungen über einen Teil der Längserstreckung der Leuchte versehen sein.The illuminant cover 20 is hooked into two hooks 22 on the carrier element. For this purpose, an outwardly directed projection 24 of length is respectively provided at the two upper edges of the lamp cover 20, which in the hook 22nd extends. The hooks 22 also extend over the entire length of the light-directing element 6. This connection also acts as a slide, so that the light-emitting device cover 20 can expand independently of the carrier element 2 under the influence of heating by the light source (s) that there is tension or warping between the components. However, the hooks 22 may also be provided with recesses over part of the longitudinal extension of the luminaire.

Im Inneren des von der Leuchtmittelabdeckung und dem Trägerelement umschlossenen Raums ist auf der Seite des Leuchtmittels, welche der Lichtaustrittsfläche zugewandt ist, eine zusätzliche Blende 26 eingeschoben. Die Blende 26 ist in zwei nutförmige Aufnahmen 28 im Inneren der Leuchtmittelabdeckung 20 eingeschoben. Auch diese Verbindung zwischen der Blende 26 und einer nutförmigen Aufnahme 28 wirkt in der Art einer Gleitschiene, um thermische Verspannungen der beiden Bauelemente zu verhindern.In the interior of the space enclosed by the illuminant cover and the carrier element, an additional aperture 26 is inserted on the side of the illuminant which faces the light exit surface. The aperture 26 is inserted into two groove-shaped receptacles 28 in the interior of the illuminant cover 20. Also, this connection between the diaphragm 26 and a groove-shaped receptacle 28 acts in the manner of a slide rail to prevent thermal distortion of the two components.

Bei der Blende 26 kann es sich um ein hochglänzendes Metallelement handeln, welches die Leuchte nach unten hin zur Entblendung abdeckt. Es kann sich aber auch um ein teilweise diffus reflektierendes Material handeln, welches ebenfalls für eine Entblendung sorgt.In the aperture 26 may be a high-gloss metal element, which covers the lamp down to glare. But it can also be a partially diffuse reflective material, which also provides a glare.

Die Leuchtmittelabdeckung 20 ist, wie beispielsweise in Figur 5 dargestellt, derart um das Leuchtmittel 4 angeordnet, daß sie in radialer Richtung vom Leuchtmittel 4 etwa den gleichen Abstand zu dem Leuchtmittel einnimmt. Dadurch ist die Erwärmung der Leuchtmittelabdekkung durch Wärmestrahlung gleichmäßig über die Leuchtmittelabdeckung verteilt, so daß auf die Leuchtmittelabdeckung eine im wesentlichen gleichmäßige Temperaturverteilung (ΔT < 20K) annimmt.The light-emitting device cover 20 is, as shown for example in FIG. 5, arranged around the light source 4 such that it occupies approximately the same distance from the light source in the radial direction from the light source 4. As a result, the heating of the Leuchtmittelabdekkung is evenly distributed over the light source cover by thermal radiation, so that the lamp cover a substantially uniform temperature distribution (.DELTA.T <20K) assumes.

Bei den dargestellten Ausführungsformen der erfindungsgemäßen Leuchte sind an den lichtlenkenden Elementen 6 sich in Längsrichtung erstreckende Prismenelemente 30 vorgesehen, die im Querschnitt senkrecht zur Längsrichtung der Leuchte ein Dreieck bilden. Diese sorgen für eine Lichtbrechung, so daß eine gleichmäßige Lichtabgabe der von dem lichtlenkenden Element 6 ausgehenden Lichtstrahlen erzielt wird. In anderen Ausführungsformen kann das lichtlenkende Element auch beispielsweise als Reflektor, der teilweise oder vollständig verspiegelt ist, ausgebildet sein, oder als ein lichtstreuendes Element, welches matt transparent ist.In the illustrated embodiments of the luminaire according to the invention, longitudinally extending prism elements 30 are provided on the light-directing elements 6, which form a triangle in cross-section perpendicular to the longitudinal direction of the luminaire. These worry for a refraction of light, so that a uniform light output of the outgoing light beam from the element 6 light rays is achieved. In other embodiments, the light-directing element may also be formed, for example, as a reflector which is partially or completely mirrored, or as a light-diffusing element which is matt-transparent.

Die Leuchtmittelabdeckung 20 in den Ausführungsformen der Figuren 5 und 6 weisen ähnliche Prismenelemente auf, wie die lichtlenkenden Elemente 6, um ebenfalls für eine Lichtbrechung des durch die Leuchtmittelabdeckung transmittierten Lichts zu sorgen.The illuminant cover 20 in the embodiments of FIGS. 5 and 6 have similar prism elements as the light-directing elements 6, in order likewise to provide refraction of the light transmitted through the illuminant cover.

An den vorhergehend beschriebenen Ausführungsformen der Erfindung können zahlreiche Veränderungen vorgenommen werden, ohne von dem Umfang der Erfindung, wie er in den Ansprüchen festgelegt ist, abzuweichen. Die Erfindung ist insbesondere nicht auf sich längserstreckende Leuchten eingeschränkt. Beispielsweise lassen sich die Merkmale der Erfindung auch für andere Geometrien wie runde Leuchte mit kugelförmigen oder ringförmigen Leuchtmitteln anwenden.Numerous changes can be made to the above-described embodiments of the invention without departing from the scope of the invention as defined in the claims. In particular, the invention is not limited to longitudinally extending lights. For example, the features of the invention can also be applied to other geometries, such as round luminaires with spherical or annular bulbs.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

22
Trägerelementsupport element
33
Gehäusecasing
44
LeuchtmittelLamp
55
Fassungversion
66
lichtlenkendes Elementlight directing element
77
Teilbereich des lichtlenkenden ElementsPart of the light-directing element
88th
Vorsprunghead Start
1010
Vorsprunghead Start
1212
Aufnahmeadmission
1414
Aufnahmeadmission
16, 16'16, 16 '
Dachreflektortop reflector
1818
Gleitführungslide
2020
LeuchtmittelabdeckungLight cover
2222
Hakenhook
2424
Vorsprunghead Start
2626
Blendecover
2828
nutförmige Aufnahmegroove-shaped recording
3030
lichtbrechende Strukturen, insbesondere Prismenelementerefractive structures, in particular prismatic elements

Claims (13)

Leuchte mit einem Trägerelement (2), an dem wenigstens ein wärmeerzeugendes Betriebsmittel und/oder ein Leuchtmittel (4) der Leuchte angeordnet ist,
und wenigstens einem lichtlenkenden Element (6) aus Kunststoff, insbesondere aus einem Thermoplast,
wobei das Trägerelement (2) und das lichtlenkende Element (6) in einem Verbindungsbereich (8, 12; 10, 14) aneinander angrenzen,
und im Betrieb der Leuchte das Trägerelement (2) und das lichtlenkende Element (6) unterschiedliche Temperaturen annehmen,
dadurch gekennzeichnet, daß der Verbindungsbereich (8, 12; 10, 14) einen Wärmestrom zwischen dem Trägerelement und dem lichtlenkenden Element so weit begrenzt, daß im Betrieb der Leuchte das lichtlenkende Element (6) außerhalb des Verbindungsbereich eine Temperaturverteilung annimmt, bei der die größte Temperaturdifferenz höchstens ΔT = 10K beträgt.Luminaire with a carrier element (2) on which at least one heat-generating operating medium and / or a luminous means (4) of the luminaire is arranged,
and at least one light-directing element (6) made of plastic, in particular of a thermoplastic,
wherein the carrier element (2) and the light-directing element (6) adjoin one another in a connection region (8, 12; 10, 14),
and the carrier element (2) and the light-directing element (6) assume different temperatures during operation of the luminaire,
characterized in that the connection region (8, 12; 10, 14) limits a heat flow between the carrier element and the light-directing element so that, during operation of the luminaire, the light-directing element (6) outside the connection region assumes a temperature distribution at which the largest Temperature difference is at most ΔT = 10K. Leuchte nach Anspruch 1, dadurch gekennzeichnet, daß die Kontaktfläche zwischen dem Trägerteil (2) und dem lichtlenkenden Element (6) höchstens 2%, bevorzugt höchstens 1% der Oberfläche des lichtlenkenden Elements (6) beträgt.Luminaire according to claim 1, characterized in that the contact surface between the carrier part (2) and the light-directing element (6) is at most 2%, preferably at most 1% of the surface of the light-directing element (6). Leuchte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Trägerelement (2) und das lichtleitende Element (6) über eine Gleitführung verbunden sind.Luminaire according to one of the preceding claims, characterized in that the carrier element (2) and the light-conducting element (6) are connected via a sliding guide. Leuchte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Trägerelement (2) zwei Vorsprünge (8,10), insbesondere zwei Gleitschienen, aufweist, die in zwei komplementäre Aufnahmen (12, 14) des lichtlenkenden Elements eingesteckt sind, um das Trägerelement mit dem lichtleitenden Element zu verbinden.Luminaire according to one of the preceding claims, characterized in that the carrier element (2) has two projections (8, 10), in particular two slide rails, which are plugged into two complementary receivers (12, 14) of the light-directing element, around the carrier element to connect the photoconductive element. Leuchte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß in einem Raumwinkelbereich zwischen einem Leuchtmittel (4) der Leuchte und dem lichtlenkenden Element (6) wenigstens ein Teil des Trägerelements (2) angeordnet ist.Luminaire according to one of the preceding claims, characterized in that at least part of the carrier element (2) is arranged in a solid angle region between a luminous means (4) of the luminaire and the light-directing element (6). Leuchte nach Anspruch 5, dadurch gekennzeichnet, daß der besagte Raumwinkelbereich einen Teil (7) des lichtlenkenden Elements (6) abdeckt, welcher dem Leuchtmittel (4) am nächsten liegt.Luminaire according to Claim 5, characterized in that the said solid angle region covers a part (7) of the light-directing element (6) which is closest to the luminous means (4). Leuchte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß an dem Trägerelement weiterhin ein Dachreflektor (16; 16') angebracht ist, der sich zwischen einem Leuchtmittel (4) der Leuchte und dem Trägerelement (2) befindet.Luminaire according to one of the preceding claims, characterized in that a roof reflector (16, 16 '), which is located between a lighting means (4) of the luminaire and the carrier element (2), is furthermore attached to the carrier element. Leuchte nach Anspruch 7, dadurch gekennzeichnet, daß der Dachreflektor (16; 16') über eine Gleitführung (18) mit dem Trägerelement (2) verbunden ist.Luminaire according to Claim 7, characterized in that the roof reflector (16; 16 ') is connected to the carrier element (2) via a sliding guide (18). Leuchte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ferner eine wenigstens teilweise lichttransparente Leuchtmittelabdeckung (20) an dem Trägerelement angebracht ist, welche zusammen mit dem Trägerelement (2) in einem Querschnitt durch das Leuchtmittel (4) einen geschlossenen Raumbereich definiert, in dem das Leuchtmittel (4) angeordnet ist.Luminaire according to one of the preceding claims, characterized in that, furthermore, an at least partially light-transparent light-emitting device cover (20) is attached to the carrier element, which together with the carrier element (2) defines a closed spatial region in a cross section through the light source (4) the lighting means (4) is arranged. Leuchte nach Anspruch 9, dadurch gekennzeichnet, daß die Leuchtmittelabdeckung mit dem Trägerelement (2) über eine Gleitführung (22, 24) verbunden ist.Luminaire according to claim 9, characterized in that the lamp cover is connected to the carrier element (2) via a sliding guide (22, 24). Leuchte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das lichtlenkende Element (6) auf wenigstens einem Teil seiner Oberfläche lichtbrechende Strukturen (30) aufweist, insbesondere linienförmige Prismenelemente.Luminaire according to one of the preceding claims, characterized in that the light-directing element (6) has refractive structures (30) on at least part of its surface, in particular line-shaped prism elements. Leuchte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das lichtlenkende Element (6) wenigstens teilweise lichtreflektierenden ausgebildet ist.Luminaire according to one of the preceding claims, characterized in that the light-directing element (6) is formed at least partially light-reflecting. Leuchte nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß die Leuchtmittelabdeckung auf wenigstens einen Teil seiner Oberfläche lichtbrechende Strukturen, lichtstreuende Strukturen und/oder lichtreflektierende Flächen aufweist.Luminaire according to claim 9 or 10, characterized in that the luminous means covering on at least part of its surface refractive structures, light-diffusing structures and / or light-reflecting surfaces.
EP07007524.7A 2006-04-12 2007-04-12 Lamp with plastic reflectors Not-in-force EP1845303B1 (en)

Applications Claiming Priority (2)

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DE102006017255 2006-04-12
DE102006047381A DE102006047381A1 (en) 2006-04-12 2006-10-06 Luminaire with plastic reflectors

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CN102720963A (en) * 2012-05-31 2012-10-10 郭允飞 LED lamp
EP2354643A3 (en) * 2010-01-29 2012-12-05 Zumtobel Lighting GmbH Reflector device
DE202012100628U1 (en) * 2012-02-24 2013-05-27 Zumtobel Lighting Gmbh Luminaire with an elongated housing and attachment element for this purpose

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DE4416109A1 (en) 1994-05-06 1995-11-09 Lenneper Gmbh & Co Kg Installation rail with reflector system for electric lighting unit

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CA2554863C (en) * 2004-01-28 2012-07-10 Tir Systems Ltd. Directly viewable luminaire
US7244058B2 (en) * 2004-03-10 2007-07-17 Truck-Lite Co., Inc. Interior lamp

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DE4416109A1 (en) 1994-05-06 1995-11-09 Lenneper Gmbh & Co Kg Installation rail with reflector system for electric lighting unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2354643A3 (en) * 2010-01-29 2012-12-05 Zumtobel Lighting GmbH Reflector device
DE202012100628U1 (en) * 2012-02-24 2013-05-27 Zumtobel Lighting Gmbh Luminaire with an elongated housing and attachment element for this purpose
CN102720963A (en) * 2012-05-31 2012-10-10 郭允飞 LED lamp

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