EP1721102B1 - Lamp - Google Patents

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Publication number
EP1721102B1
EP1721102B1 EP05728246A EP05728246A EP1721102B1 EP 1721102 B1 EP1721102 B1 EP 1721102B1 EP 05728246 A EP05728246 A EP 05728246A EP 05728246 A EP05728246 A EP 05728246A EP 1721102 B1 EP1721102 B1 EP 1721102B1
Authority
EP
European Patent Office
Prior art keywords
reflector
characterised
lamp according
lamp
led
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 - Fee Related
Application number
EP05728246A
Other languages
German (de)
French (fr)
Other versions
EP1721102B8 (en
EP1721102A1 (en
Inventor
Harald Hofmann
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 GmbH
Original Assignee
Osram GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE102004011368 priority Critical
Application filed by Osram GmbH filed Critical Osram GmbH
Priority to PCT/DE2005/000369 priority patent/WO2005085706A1/en
Publication of EP1721102A1 publication Critical patent/EP1721102A1/en
Publication of EP1721102B1 publication Critical patent/EP1721102B1/en
Application granted granted Critical
Publication of EP1721102B8 publication Critical patent/EP1721102B8/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00Fastening of light sources or lamp holders
    • F21V19/001Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20Light sources comprising attachment means
    • F21K9/23Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40Cooling of lighting devices
    • F21S45/47Passive cooling, e.g. using fins, thermal conductive elements or openings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00Arrangement of electric circuit elements in or on lighting devices
    • F21V23/06Arrangement of electric circuit elements in or on lighting devices the elements being coupling devices, e.g. connectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50Cooling arrangements
    • F21V29/70Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/71Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
    • F21V29/713Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements in direct thermal and mechanical contact of each other to form a single system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50Cooling arrangements
    • F21V29/70Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/77Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
    • F21V29/773Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/0008Reflectors for light sources providing for indirect lighting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/06Optical design with parabolic curvature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

The invention relates to a lamp (10) comprising at least one base (11) which is joined to a light, comprising a dome-shaped, in particular dish-shaped, essentially rotationally symmetrical reflector (13), wherein a light source is arranged in the focal point (32) or focal point area thereof in order to produce an oriented, e.g. narrowly emitting, light distribution from said lamp (10). The reflector is provided with an opening (15) which comprises a light exit plane (E) for the lamp (10). The invention is characterised in that the light source is formed by at least one LED (20, 20a, 20b, 20c) and is arranged at a distance from the inner side (14) of the reflector, and that at least one functional element of the LED, in particular at least one voltage supply line (21a, 21b, 21c, 21d) of the LED and/or at least one cooling body (29, 30a, 30b, 30c, 30d) for the LED, extends at least partially essentially along the light exit plane (E) or is arranged at least partially on the side of the light exit plane (E) which is oriented away from the reflector (13).

Description

  • The invention relates to a lamp, comprising at least one base for connection to a luminaire, with a rotationally symmetrical reflector, in the focal point or focal point region for generating a directed light distribution of the lamp, a light source is arranged, wherein the reflector has a reflector opening, which is a light exit plane of the lamp provides.
  • Such a lamp is available under the trademark HALOSPOT from Osram GmbH in Munich. The known lamp, known for example as HALOSPOT 111, has a plug-in base with two connection pins, which is connected to a socket, for example. aluminum coated reflector is connected. In the region of the vertex of the reflector, a halogen incandescent lamp is arranged as the light source, wherein the incandescent filament is located approximately in the region of the focal point of the parabolic reflector. The halogen lamp is covered in the main emission of the lamp by a cap which is held by means of two gripping ridges on the reflector edge. The cap prevents direct light emission of the lamp in Hauptabstrahlrichtung.
  • The known lamp has a defined, e.g. Very low radiation angle, approximately in the range of about 8 ° and thus allows a targeted lighting of building surfaces or objects in the manner of accent lighting even over long distances. The known lamp is typically used in the field of "shop lighting".
  • EP 1 357 335 A2 describes a lighting apparatus having a moving mechanism capable of changing a light emitting direction and having a heat dissipation function. The lighting device has a lighting unit and a heat-dissipating unit for dissipating the waste heat generated by the lighting unit, wherein a heat-conducting unit of the lighting unit and the heat-dissipating unit is interposed, and the lighting unit is in surface contact with the heat dissipation unit and connected to the heat dissipation unit so as to be rotatable with a dot or a line in the middle.
  • US 2002/0136025 A1 describes a light source arrangement comprising a cell body having a concave light projection surface and a hemispherical reflector cavity surrounded by the light projection surface, and a light source unit having at least two terminal electrodes and at least one light-emitting element which can be fed through the terminal electrodes and a support frame having a light source unit predetermined width, which is mounted on the cell body to hold the light source unit at the focal point of the reflector cavity, so that light emitted from the light source unit light can be reflected from the reflector cavity to the outside. Heat is dissipated through the support frame.
  • US 5,924,785 , which represents the closest prior art, describes a light source assembly having at least one illumination cell comprising a cell body having a concave light projection surface and a hemispherical reflector cavity surrounded by the light projection surface, as well as an LED cell having at least two terminal electrodes and at least one light-emitting element feedable by the terminal electrodes, and a support frame having a predetermined width, which is fixed on the cell body to hold the LED cell at the focal point of the reflector cavity so that light emitted from the light source unit is emitted from the light source Reflektorkavität can be reflected to the outside. Heat is dissipated through the support frame.
  • US 2003/0067784 A1 describes a reflector for a lighting arrangement of a motor vehicle, which has at least one reflector surface for light emitted by a lighting element, wherein the lighting element is arranged at a distance from the at least one reflector surface. The at least one reflector surface is a surface of revolution whose generatrix is part of a curve and increases in a direction to the lighting element, which is aligned in the at least one reflector surface. The curve can be a parabola, an ellipse, or a freeform curve.
  • DE 299 10 417 U1 describes a lighting device with a light source, with a reflector for light emitted by the light source and with a lens arranged in front of the light, wherein between the reflector and the lens, a support plate is fixed on the reflector facing the rear side, the light source is arranged.
  • Starting from the known lamp, the object of the invention is to provide a lamp with a longer life.
  • The invention solves this problem by a lamp, comprising at least one base for connection to a lamp, with a curved, in particular parabolic, substantially rotationally symmetric reflector, in the focal point or focal point region for generating a directed light distribution of the lamp, a light source is arranged, wherein the Reflector has a reflector opening which provides a light exit plane of the lamp, wherein the light source is formed by at least one LED and spaced from the inside of the reflector is arranged and at least one functional element of the LED at least partially substantially along the light exit plane or at least partially on the reflector is disposed opposite side of the light exit plane and wherein the reflector is associated with a transparent cover member which closes the reflector opening (15) and wherein the at least one functional element in the form of at least one Voltage supply line is provided, which is arranged on the side facing away from the reflector of the cover element.
  • A principle of the invention thus consists essentially in providing an LED instead of the known halogen incandescent lamp as the light source. This will a lamp life extended by orders of magnitude possible. As LED in the sense of claim 1 is understood an LED assembly, such as an LED chip, which may have one or more LED (light emitting diodes).
  • The distanced arrangement of the LED from the inside of the reflector allows a substantially breakdown-free design of the reflector. While in the lamp of the prior art, the incandescent lamp penetrates the reflector approximately in the region of the vertex of the reflector and is fastened to the reflector in the region of the vertex, according to the invention an attachment of the LED to the edge region of the reflector is possible by means of functional elements which extend substantially along a light exit plane of the lamp extend. At the same time according to the invention there is the possibility of power supply lines, so voltage supply lines, also run in the light exit plane of the lamp. Heat sinks, for example cooling blocks or cooling plates, can also be arranged on the side of the light exit plane facing away from the reflector or on the side of the LED facing away from the reflector.
  • As a functional element in the context of the invention are power supply lines for the LED and possibly additionally, for example, heatsinks for the LED, fasteners for the LED, which allow attachment of the LED relative to the reflector and possibly also other components of the LED unit, for example, understood a chip body ,
  • With the lamp according to the invention, a shading problem is avoided since the light emanating from the LED can hit the inside of the reflector free of obstacles and can be reflected there in the desired manner and thus forwarded therewith. In the apex region of the reflector according to the invention no components are arranged, which reduce the reflector surface. Formed by the spaced arrangement of the LED from the apex region of the reflector a component-free gap between the inner surface of the reflector and the actual light source.
  • Both the fasteners for the LED and the cooling elements and power supply lines are arranged in the region of the reflector opening so that they allow a virtually trouble-free passage of the entire luminous flux through the reflector opening. The invention recognizes that the arrangement of the functional elements for the LED in the region of the reflector opening raises significantly lower shading problems than if the LED were directly connected to the apex region of the reflector.
  • Finally, according to the invention, a simple and efficient cooling of the LED unit becomes possible, wherein the one or more heat sinks are also arranged at a distance from the vertex of the reflector. Thus, for example, designed as a solid cooling block heat sink can be arranged on the side facing away from the reflector of the LED unit and only slightly affect the light passage due to its compact and central arrangement. Likewise, heat sinks designed as cooling plates can extend from the LED unit to the edge of the reflector and have a cross-sectional area projected onto the light exit plane, which is negligibly small with respect to the entire cross-sectional area of the reflector opening, and thus the light output from the lamp therefrom is also insignificant impaired.
  • The principle according to the invention thus consists of not arranging components of an already required geometric size in a region of the apex of the reflector, where this leads to greater light losses, but to arrange these components in a region of the reflector opening and, due to a suitable geometric design, the proportion of the shading cross-sectional area the components based on the entire reflector opening to keep low.
  • In addition, the invention recognizes that an LED or an LED unit, that is to say an element which has one or more LEDs, only requires a very small installation space and in this way an arrangement in the focal point or in a focal point area of the reflector is possible without that larger shading problems occur.
  • The wording according to which the functional elements are arranged essentially along the light exit plane or on the side of the light exit plane facing away from the reflector takes into account that the functional elements are advantageously arranged at a location as distant as possible from the apex region of the reflector, ie also advantageously in the region of a free edge of the reflector. However, the wording of claim 1 should also include such exemplary embodiments, in which the functional elements are arranged slightly distanced from the reflector opening. In particular, in this context, embodiments are conceivable in which the actual, for example, parabolic reflector, still a free edge portion is assigned, which has virtually no additional, light-directing or photoconductive function and thus only a kind of extension of the reflector, for example, for reflector mounting or glare limitation represents. In this case, the light exit plane in the context of the invention is slightly distanced from the actual reflector opening.
  • Directional light distribution in the sense of claim 1 is understood, for example, as a closely radiating, ie predominantly parallel radiation, which requires a parabolic reflector. Alternatively, however, a directional radiation is also understood to mean a focusing radiation which requires, for example, an elliptical reflector, that is to say a reflector whose reflector inner surface has the curve shape of an elliptical section. Also in this case the reflector is rotationally symmetric.
  • Furthermore, a directional light distribution in the context of the invention is also understood to mean that which is achieved by an almost arbitrary surface structuring of the inner surface of the reflector, for example by attachment of a prism structure or the like. Such structures are known, for example, from the motor vehicle headlight area and are referred to there as free-running. Likewise, the interior surface of the reflector may also be segmented to provide different reflector contours.
  • The lamp according to the invention has a base for connection to a light-side lamp socket. It may be z. Example, to act as a socket conventional design, as it is known, for example from the HALOSPOT 111 ago, which forms an axial end portion of the lamp. Alternatively, a light-side attachment of the lamp but also be done by fixing elements are arranged in the region of the reflector edge, which cooperate with light-side fastening elements. As a fastener comes a mounting ring od. Like. In question. As a base of the lamp according to the invention is understood in such an embodiment of the lamp-side mounting portion which cooperates with the fastening element.
  • The base of the lamp according to the invention may also have the electrical connection contacts for connection to luminaire-side mating terminal contacts, for example in the form of terminal contact pins, which are arranged within the socket, as is the case with the known HALOSPOT 111. Alternatively, the lamp can also be associated with the LED unit connected terminal lugs or terminal contacts that allow a particular immediate light side screw or terminal connection. The mechanical attachment is in this case only below, eg the use of a mounting ring.
  • In addition, the cover element eliminates the need for cleaning during a long life of the lamp. Except for an approximately in the center of the cover element, ie in the region of the longitudinal center axis of the reflector arranged receptacle for the LED unit, this cover element closes the reflector opening completely and prevents penetration of dust or dirt particles in the reflector interior. The reflector interior is completed in this way and allows a maintenance-free lamp operation.
  • Characterized in that the voltage supply line is arranged on the side facing away from the reflector of the cover element, the cover element thus optionally also the function of a support element for the power supply line and allows a particularly simple attachment or attachment of the power supply line to the reflector. For this purpose, the cover element, for example, directly connected to the free edge of the reflector, for example, be glued. Alternatively, the power supply line, which may also be an integral part of a further functional unit comprising assembly, be attached to the lid member or directly on the reflector. The side facing away from the reflector of the cover element can provide in this way a bearing surface for a unit and thus ensure easy positioning during assembly.
  • According to an advantageous embodiment of the invention, the functional element projects at least partially out of the reflector opening. This design of the functional element takes into account that a shading problem is kept small, as far as the projected to the light exit plane cross section of the functional element makes up only a small area of the entire reflector opening, whereas an extension of the functional element out of the reflector opening, so starting from the light exit plane of the reflector element in directed away substantially in the central longitudinal axis of the reflector, no major shading problems with it.
  • If only two voltage supply lines are required for the power supply, they can preferably extend in the opposite direction to one another, ie diametrically, essentially in the region of the light exit plane. This also offers advantages in terms of stability of a later to be described attachment of a unit, which has functional elements of the LED, on the reflector. Insofar as the LED unit has three power supply lines (in particular for an LED unit with at least two LEDs), which are required, for example, to connect two different LEDs or two different types of LEDs, e.g. LEDs of different colors to be able to control separately, these power supply lines are preferably arranged in a respective circumferential angle of 120 ° to each other along the light exit plane.
  • If four power supply lines are required, for example in order to be able to drive at least three different LEDs or three different types of LED, for example red LED, green LED and blue LED individually, these four voltage supply lines are advantageously arranged such that two voltage supply lines are essentially at an angle of 90 ° ° along the light exit plane to each other.
  • According to an advantageous embodiment of the invention, at least one voltage supply line is provided which engages around an edge of the reflector opening. This embodiment of the invention enables the construction of a lamp which on the one hand raises virtually no shading problems and on the other hand ensures a secure and stable electrical connection of the LED to the base and also offers advantages in terms of ease of installation.
  • According to a further advantageous embodiment of the invention, a handle part is provided on the side facing away from the reflector of the light exit plane or, if present, on the side facing away from the reflector of the cover element. This handle part may for example be part of a functional unit having structural unit, which includes, for example, heat sink and power supply lines and possibly required insulating layers or insulator. On the one hand, the grip part can enable a particularly simple assembly of this structural unit on the reflector. On the other hand, the handle part can advantageously also serve to insert the lamp in a lamp socket provided, if only very small installation spaces for the lamp are available.
  • According to a further advantageous embodiment of the invention, the LED is assigned at least one heat sink for heat dissipation. This embodiment of the invention offers the advantage of a long life of the lamp.
  • According to a further advantageous embodiment of the invention, the heat sink is arranged at a distance from the vertex of the reflector. This arrangement of the heat sink allows an almost unimpaired light transmission of the light emitted by the LED or the LED unit within the reflector interior.
  • According to a further advantageous embodiment of the invention, the heat sink is arranged on the side facing away from the reflector of the light exit plane and / or the LED. This embodiment of the invention provides a positioning of the heat sink as far as possible from the vertex of the reflector and thus contributes to a substantially interference-free light pipe within the reflector on.
  • According to a further advantageous embodiment of the invention, the heat sink is formed by a compact, in particular solid cooling block. In this embodiment of the invention, you can keep the required space for housing the heat sink small. This allows an arrangement of the cooling block substantially in the region of a longitudinal center axis of the reflector, preferably on the side facing away from the reflector Light exit plane and / or on the side facing away from the reflector of the LED. This further reduces the shading problem and promotes advantageous heat convection.
  • According to a further advantageous embodiment of the invention, the heat sink comprises a cooling plate, which extends substantially along the light exit plane. In this embodiment of the invention, a larger compared to a cooling block surface is achieved, which facilitates a Wärmekonvektion. At the same time it is possible, while maintaining a substantially interference-free light control within the reflector, to achieve a stable arrangement of heat sink, LED unit, power supply lines and reflector. The cooling plates can provide, for example, the aforementioned handle parts. You can also be part of a unit that attaches the LED unit to the reflector. Thus, for example, the cooling plate of the LED, so the center of the reflector opening, extend substantially to an edge of the reflector opening and in this way for a stable connection, for example by gripping the edge or by a possible interaction with a fastener, for example with a clamping ring or mounting ring, provide, which provides for an indirect attachment of the preassembled unit to the reflector.
  • According to a further advantageous embodiment of the invention, the reflector is formed substantially continuously. Such a continuous design of the reflector is provided in particular in the region of its apex. This allows undisturbed passing of light within the reflector interior. In addition, the reflector of the lamp and thus the entire lamp can now be made easier and easier to install.
  • Further advantages of the invention will become apparent from the non-cited subclaims and with reference to the following description of an embodiment shown in the figures. Show:
  • Fig. 1
    in a schematic, partially sectioned view of a lamp according to the invention,
    Fig. 2
    a second embodiment of a lamp according to the invention in a representation according to a partial enlargement approximately according to section circle II in Fig. 1 .
    Fig. 3
    the lamp according to Fig. 1 in plan view according to arrow III in Fig. 1 .
    Fig. 4
    the lamp according to Fig. 1 in a position rotated by 90 ° about the central longitudinal axis (see also the section line data II in Fig. 3 and IV-IV in Fig. 3 )
    Fig. 5
    the embodiment of FIGS. 1 to 4 in a schematic representation approximately according to Fig. 3 .
    Fig. 6
    a third embodiment of the lamp according to the invention in a representation according to Fig. 5 , and
    Fig. 7
    A fourth embodiment of the lamp according to the invention in a representation according to Fig. 5 ,
  • The lamp designated in its entirety by 10 in the figures will be explained in detail below. It should already be noted that the same or similar parts or elements have been designated for clarity with the same reference numerals, partially with the addition of small letters.
  • On the Fig. 1 Referring to Fig. 1, it will be apparent that a first embodiment of the lamp 10 has a base 11 in which two contact pins 12a, 12b are fixed. The number of contact pins is initially to be understood as an example and depends on the type of LED used and their number, in particular the way in which the LED should be controlled. For this purpose, an unillustrated electronic control device in the manner of a ballast can be arranged on the lamp 10. However, such a ballast is preferably arranged on the luminaire side, that is to say on the side of the lamp socket, which is not shown, from the current viewpoint of the lamp 10. Finally, the type of contact pins to be used also depends on the required supply voltage.
  • The base 11 is connected to a reflector 13, which is formed in the embodiment substantially parabolic-shaped and has a continuous shell shape. The reflector is designed to be rotationally symmetrical about the longitudinal central axis L of the lamp 10 and has a focal point or focal point region 32 arranged in the region of the longitudinal central axis L and at a vertex or apex region 27 of the reflector 13. The reflector interior 33 ( Fig. 4 ) is essentially empty.
  • The reflector 13 comprises a reflector opening 15 which is bounded by an edge 16 of the reflector. The edge 16 is connected to a clamping modem mounting ring 31. The reflector opening 15 provides a light exit plane E ready.
  • In the region of the focal point 32 of the reflector 13, an LED unit 19 with at least one LED 20, 20a, 20b, 20c is arranged. The LED 20, 20a, 20b, 20c emits light substantially in the direction x, which strikes the mirrored, but in any case, reflective inner surface 14 of the reflector 13. The light is directed by the reflector such that the light emitted by or from the LED 20, 20a, 20b, 20c, 20d, 20e leaves the lamp 10 substantially in the main emission direction A and a substantially parallel beam of only a very small one Represents beam expansion of a few degrees.
  • As in particular from the FIGS. 1, 2 and 4 becomes clear, in addition, a substantially circular disc-shaped cover member 17 is provided, which has a central recess 18 for receiving the LED unit 19 and is connected to its outer edge region 22 with the free edge region 16 of the reflector element 13. The reflector interior 33 is almost completely closed by the cover element 17. The lid member 17 is made of transparent material, such as transparent plastic, such as acrylic glass and has a smooth or textured surface.
  • The LED unit 19 is, for example, an LED chip, that is to say a carrier component which has at least one LED and has the required electrical connection contacts for the LED or the LED. In order to supply the at least one LED 20 with an operating voltage, at least two voltage supply lines 21a, 21b are required. These are guided according to the embodiment substantially along the light exit plane E of the LED unit 19 toward the edge 16 of the reflector 13. The power supply lines 21a, 21b lie directly on the cover element 17.
  • In one embodiment, not shown, the power supply lines may possibly also be an integral part of a cover element 17.
  • As in particular from the Figures 1 and 2 becomes clear, surrounds the power supply line 21 a (and in a manner not shown equally the opposite power supply line 21 b) the edge portion 22 of the cover member 17 and the edge portion 16 of the reflector 13 and thereby merges into a terminal lug 23. In order to connect the terminal lug 23 with the contact pins 12a, 12b in the socket 11, a rear portion of the power supply line 24 (or 24a, 24b) is provided. The rear portion 24, 24 a, 24 b of the power supply line extends on the side facing away from the LED unit 19 of the reflector 13 and is in Fig. 1 only shown schematically. An enveloping body 21, for example, a plastic embedding for the line section 24 provides or even an insulating coating can ensure that the power supply line sections 24, 24a, 24b are not freely accessible.
  • In a second embodiment of the invention, which schematically according to Fig. 2 is implied, the in Fig. 1 illustrated base 11 of the lamp omitted. In the Fig. 1 shown rear voltage supply line sections 24a, 24b are also unnecessary. Instead, a fastening of the lamp via a clamping or mounting ring 31 is directly on the light side at a designated, not shown attachment point. In the Fig. 2 designated 24 angled terminal lug may be formed in the manner of a plug contact or in the manner of a screw and interact directly with light-side mating connection lines or mating connection contacts. Usually would be in this case when mounting the lamp first provide electrical contact, for example, by making the Schraubbefestigung, and then attach the lamp 10 via the clamping or mounting ring 31 on the light side.
  • As a pedestal in the context of the invention, the Klemmoder mounting ring 31 of the lamp 10 is referred to in this case.
  • Of particular importance in all embodiments is that the power supply lines 21a, 21b extend in the region of the light exit plane E and thus occupy only a small areal proportion of the reflector opening 15, otherwise they do not impair the light conduction within the reflector interior 33.
  • The beam path of the light emitted by the LED 20 is schematically shown by dashed arrows Fig. 4 indicated.
  • Another special feature is that the LED unit 19 cooling elements in the form of a cooling block 29 or in the form of cooling plates 30a, 30b, 30c, 30d may be assigned, on the side facing away from the reflector 13 of the LED unit 19 and / or are arranged on the side facing away from the reflector of the light exit plane E. According to the Figures 1 and 2 a cooling block 29 is provided, which is formed substantially in the shape of a piston and extends away from the actual LED chip 19 in the main emission direction A, ie substantially along the longitudinal central axis L of the lamp 10. The projected onto the light exit plane E surface of the LED chip 19 and the cooling block 29 can therefore be kept relatively small. While in LED chips of the state of the art, as currently of LED chips manufacturers are provided, the LED chips in a plane are very extensive, since the cooling surfaces are arranged along the plane along which the chip extends, according to the invention a housing of a cooling block 29 without substantial impairment of the light emission due to the more compact design of the LED chip possible. The detailed design of the LED chip is arbitrary. In this case, it is possible to make use of experiences with the connection of cooling surfaces with the LED in conventional LED chip arrangements. For example, the cooling block 29 can dissipate the heat generated during operation of the LED from the back side of an LED chip 19. Other connections are also conceivable.
  • Merely in addition, it should be noted that a particularly advantageous brought under the name "Lumiled" LED chip unit can be used as an LED unit 19, in which a forwarding of the heat generated by the LED during operation of a arranged on the chip Chip body to a cooling element in a particularly simple manner is possible.
  • Further shows Fig. 1 Also, the arrangement of two cooling plates 30a, 30b, which extend web-like from the LED chip 19 to the edge 16 of the reflector element 13. In this connection, it should be noted that the embodiment shown in the figures provides both cooling plates 30a, 30b and a cooling block 29. This is only to be understood as an example. Alternatively, it is also possible to provide lamps which have only one cooling block or only one or more cooling plates.
  • According to the exemplary embodiment, the cooling plate 30a contacts the outer side 36 of the cooling block 29 with its central contact surface 35 and forms a thermal bridge for heat conduction. This too is only to be understood as an example, since other contacting possibilities of the cooling plates 30a, 30b with the LED chip 19 are also possible.
  • However, the heatsinks 30a, 30b, 30c, 30d allow for providing a large surface area so that particularly effective cooling and convection of the generated heat to the environment is achieved.
  • The cooling plates 30a, 30b are, with respect to the emission direction A of the lamp 10, arranged in alignment with the voltage supply lines 21a, 21b, 21c, 21d. This also results from the FIGS. 5 to 7 , which will be discussed later. It is advantageous that the overall occupied by the cooling plates and the power supply lines cross-section, so their projected onto the light exit surface area, occupies only a very small area ratio of the total of the reflector opening 15 area.
  • As in particular from Fig. 2 becomes clear, an insulating layer 28 or an insulating body is disposed between the power supply line 21a and the corresponding cooling plate 30a. This ensures an electrical separation of these two components.
  • In an embodiment not shown, it is possible to electrically connect the cooling plates 30a, 30b, 30c, 30d and the corresponding power supply line 21a, 21b, 21c, 21d. The insulating body 28 can be omitted in such an embodiment. In the presently described and illustrated in the drawings embodiment, the electrical separation of cooling plates 30a, 30b, 30c, 30d and power supply lines 21, 21 b, 21 c, 21 d, however, is desired.
  • Furthermore, as is out Fig. 2 results in a fastener 31, which is formed in the embodiment as Klemmoder mounting ring, provided to attach the LED unit 19, the cooling elements 29, 30a, 30b, 30c, 30d, the insulating body 28 and the power supply lines 21a, 21b, 21 c, 21 d to allow the reflector 13 to a lamp. In this connection, it should be noted that some or all of the following elements LED unit 19, cooling block 29, cooling plates 30a, 30b, 30c, 30d, power supply lines 21a, 21b, 21c, 21d and insulator 28 may form a common preassembled unit. In addition, it should be noted that the clamping or mounting ring 31 can be connected to this unit preassembled and can be done as a base instead of the base 11, the connection to the lamp.
  • In the embodiment, all of the previously listed components are connected to a manageable unit. On clamping ring 31 and recesses 37 (see, in particular Fig. 3 ) may be provided for the terminal lugs 23.
  • In addition, it should be noted that in the embodiment, the cooling plates 30a, 30b, 30c, 30d directly provide a handle body. In the assembled state can be detected by gripping the cooling plates, the entire lamp 10 and mounted in a simple manner.
  • The cooling plates are, as can be seen in particular from the FIGS. 5 and 7 and the Fig. 1 results, relatively narrow, but have a relatively large height extending in the direction of radiation A. This geometric design facilitates detection of the cooling plates, but on the other hand does not affect the light emission.
  • The FIGS. 5 to 7 illustrate in plan view of the reflector opening 15 different geometric arrangements and embodiments of lamps depending on the number of required power supply lines. Is how the Fig. 5 indicates, only one LED or only one kind or group of several LED provided, so only two power supply lines 21a, 21b are required, which are opposite, so extend substantially diametrically to each other. Fig. 6 shows an arrangement with two differently controllable LED or groups of LED, consequently, due to circuitry requirements, at least three power supply lines are required to control these two LEDs individually. Accordingly, it is advantageous to have an arrangement in which two voltage supply lines each enclose a circumferential angle of 120 ° along the light exit plane E.
  • Fig. 7 shows a third embodiment in which three LED (eg red, green, blue) or three groups of LED, which are individually controlled, are provided. As a result, four power supply lines are interposed, enclosing an angle of 90 ° therebetween.
  • As mentioned above, the embodiments of the FIGS. 5 to 7 also heat-dissipating cooling plates 30a, 30b, 30c, 30d, which are arranged in alignment with the voltage supply lines 21a, 21b, 21c, 21d. In this way, results from the power supply lines or the cooling plates 30a, 30b, 30c, 30d projected area (when projecting onto the light exit plane E), which only a very small proportion relative to the entire, the Has light exit plane E lying reflector opening. The light emission can thus be done virtually trouble-free.

Claims (19)

  1. A lamp (10), comprising at least one socket (11) for connection to a luminaire, which possesses threaded, clamping or plug-in connection contacts for connection with mating connection contacts on the luminaire side, fitted with a cambered, substantially rotation symmetric reflector (13), in whose focus (32) or focus area a light source is installed for generating a directed light distribution of the lamp (10), for instance narrow radiating, wherein the reflector has a reflector aperture (15), which provides a light emergence plane (E) of the lamp (10), wherein the light source is made of at least one LED (20, 20a, 20b, 20c) and is arranged at a distance from the inside (14) of the reflector, and that at least one functional element of the LED extends at least partially substantially along the light emergence plane (E) or is arranged at least partially on the side of the light emergence plane (E) facing away from the reflector (13),
    characterised in that a transparent covering member (17) is associated with the reflector (13), which member closes the reflector aperture (15) and that said at least one functional element is provided in the form of at least one power supply line (21 a, 21 b, 21 c, 21 d), which is installed on the side of the covering member (17) facing away from the reflector (13).
  2. The lamp according to claim 1 characterised in that the functional element (21 a, 21 b, 21 c, 21 d, 29, 30a, 30b, 30c, 30d) protrudes at least partially from the reflector aperture (15).
  3. The lamp according to claim 1 or 2, characterised in that at least one power supply line (21a, 21b, 21c, 21d) is associated with the LEDs, which extends substantially along the light emergence plane (E).
  4. The lamp according to claim 3 characterised in that two power supply lines (21a, 21b) are provided for the LEDs which extend substantially diametrally relative to one another.
  5. The lamp according to claim 3 characterised in that three power supply lines (21 a, 21 b, 21 c) are provided for the LEDs, whereas two of which include an angle of approx. 120° along the light emergence plane (E).
  6. The lamp according to claim 3 characterised in that four power supply lines (21 a, 21 b, 21 c, 21 d) are provided for the LEDs, whereas two of which include an angle of approx. 90° along the light emergence plane (E).
  7. The lamp according to one of the previous claims, characterised in that at least one power supply line (21 a, 21 b, 21 c, 21 d) is provided, which encompasses a rim (16) of the reflector aperture (15).
  8. The lamp according to one of the previous claims, characterised in that the covering member (17) is susbtantially in the form of a circular disc.
  9. The lamp according to one of the previous claims, characterised in that that the covering member (17) has a central opening (18) for receiving the LEDs (19, 20, 20a, 20b, 20c).
  10. The lamp according to one of the previous claims, characterised in that that a handle (30a, 30b, 30c, 30d) is provided on the side of the light emergence plane (E) facing away from the reflector (13).
  11. The lamp according to one of the previous claims, characterised in that that at least one heat sink (29, 30a, 30b, 30c, 30d) is associated with the LEDs (20a, 20b, 20c, 20d, 20e) for dissipating heat.
  12. The lamp according to claim 11 characterised in that the heat sink (29, 30a, 30b, 30c, 30d) is spaced apart from the apex (27) of the reflector (13).
  13. The lamp according to claim 11 or 12, characterised in that the heat sink (29, 30a, 30b, 30c, 30d) is arranged on the side of the light emergence plane (E) and/or of the LEDs facing away from the reflector (13).
  14. The lamp according to one of the claims 11 to 13, characterised in that the heat sink comprises a compact cooling block (29).
  15. The lamp according to claim 14 characterised in that the cooling block (29) is provided substantially in the region of a longitudinal middle axis (L) of the reflector (13).
  16. The lamp according to one of the claims 11 to 15, characterised in that the heat sink includes a cooling plate (30a, 30b, 30c, 30d), which extends substantially along the light emergence plane (E).
  17. The lamp according to claim 16 characterised in that the cooling plate (30a, 30b, 30c, 30d) extends from the LEDs (20, 20a, 20b, 20c, 20d, 20e) substantially up to a rim (16) of the reflector aperture (15).
  18. The lamp according to one of the previous claims, characterised in that the reflector (13) is formed substantially continuously.
  19. The lamp according to one of the previous claims, characterised in that that the reflector (13) has no ruptures in the region of its apex (27).
EP05728246A 2004-03-05 2005-03-03 Lamp Expired - Fee Related EP1721102B8 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102004011368 2004-03-05
PCT/DE2005/000369 WO2005085706A1 (en) 2004-03-05 2005-03-03 Lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10012150A EP2270384A3 (en) 2004-03-05 2005-03-03 Lamp

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EP10012150.8 Division-Into 2010-09-30

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EP1721102A1 EP1721102A1 (en) 2006-11-15
EP1721102B1 true EP1721102B1 (en) 2011-08-03
EP1721102B8 EP1721102B8 (en) 2012-02-08

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EP10012150A Withdrawn EP2270384A3 (en) 2004-03-05 2005-03-03 Lamp

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US (2) US7857496B2 (en)
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JP (1) JP4778503B2 (en)
CN (1) CN1954174B (en)
WO (1) WO2005085706A1 (en)

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Also Published As

Publication number Publication date
WO2005085706A1 (en) 2005-09-15
EP2270384A2 (en) 2011-01-05
US7857496B2 (en) 2010-12-28
JP4778503B2 (en) 2011-09-21
CN1954174B (en) 2012-07-04
US20110116270A1 (en) 2011-05-19
EP1721102B8 (en) 2012-02-08
JP2007526605A (en) 2007-09-13
US20070189017A1 (en) 2007-08-16
EP1721102A1 (en) 2006-11-15
EP2270384A3 (en) 2011-02-16
CN1954174A (en) 2007-04-25
US8162522B2 (en) 2012-04-24

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