EP1828671B1 - Lighting device comprising at least one light-emitting diode and vehicle headlight - Google Patents

Lighting device comprising at least one light-emitting diode and vehicle headlight Download PDF

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Publication number
EP1828671B1
EP1828671B1 EP05822978.2A EP05822978A EP1828671B1 EP 1828671 B1 EP1828671 B1 EP 1828671B1 EP 05822978 A EP05822978 A EP 05822978A EP 1828671 B1 EP1828671 B1 EP 1828671B1
Authority
EP
European Patent Office
Prior art keywords
illumination device
light
heat sink
emitting diode
device 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.)
Active
Application number
EP05822978.2A
Other languages
German (de)
French (fr)
Other versions
EP1828671A1 (en
Inventor
Gerhard Behr
Peter Helbig
Thomas Reiners
Ralf Vollmer
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 DE102004062990A priority Critical patent/DE102004062990A1/en
Application filed by Osram GmbH filed Critical Osram GmbH
Priority to PCT/DE2005/002169 priority patent/WO2006066530A1/en
Publication of EP1828671A1 publication Critical patent/EP1828671A1/en
Application granted granted Critical
Publication of EP1828671B1 publication Critical patent/EP1828671B1/en
Application status is Active 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
    • 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
    • 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • F21S41/143Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19Attachment of light sources or lamp holders
    • F21S41/192Details of lamp holders, terminals or 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
    • F21V29/54Cooling arrangements using thermoelectric means, e.g. Peltier elements
    • 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
    • F21V29/60Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • 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
    • F21V29/75Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with fins or blades having different shapes, thicknesses or spacing
    • 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
    • F21V29/76Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-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
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24Light guides
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/29Attachment thereof
    • 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
    • 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]

Description

  • The invention relates to a lighting device according to the preamble of patent claim 1 and a vehicle headlamp with at least one such lighting device.
  • I. State of the art
  • Such a lighting device is for example in the EP-A 1 298 382 disclosed. This document describes a lighting device with a plurality of light emitting diodes, which are arranged on a heat sink, and an optic and an electrical module for operating the light emitting diodes. This lighting device is intended for use in a vehicle and as a replacement for a conventional light bulb.
  • The DE 102 35 699 A1 discloses a light source, in particular for motor vehicles, with a base and at least one light-emitting element, wherein the base is provided as an adapter for LEDs, via which the current or voltage supply to the LEDs. The US 6,598,996 B1 . US 6,268,702 B1 and US 2004/4165387 A1 reveal lighting equipment with light emitting diodes and bayonet socket.
  • II. Presentation of the invention
  • It is an object of the invention to provide a generic lighting device that allows reliable mounting in a vehicle headlight, with a defined spatial position and orientation with respect to the headlight optics.
  • This object is achieved by the features of claim 1. Particularly advantageous embodiments of the invention are described in the dependent claims.
  • The lighting device according to the invention has at least one light emitting diode and a heat sink for cooling the at least one light emitting diode, wherein locking means are arranged on the heat sink, which serve to form a bayonet closure with a holder for the illumination device. The plug and turn movement, which is required in the bayonet closure for establishing the connection between the lighting device and its holder, ensures a reliable attachment of the lighting device. In addition, by means of the bayonet closure in a relatively simple manner, optionally with a few additional means, a defined mounting position of the illumination device according to the invention can be achieved in its holder. When using the illumination device according to the invention in a vehicle headlight thereby an adjustment of the light-emitting diodes or the primary optics of the illumination device is made possible with respect to the light-guiding means of the vehicle headlight.
  • Advantageously, the locking means comprise at least two locking tabs arranged along a circular arc. As a result, at least two support points are formed, which ensure a stable fixation of the illumination device in its holder. Preferably, three locking tabs are provided, which are used both as a reference for the orientation of the LEDs and the primary optics on the heat sink of the illumination device as well as a reference for the orientation of the illumination device relative to a holder or against the light-guiding means of a vehicle headlamp.
  • The aforementioned locking tabs are integrally formed according to an embodiment of the illumination device according to the invention to a portion of the heat sink with a circular-cylindrical geometry. As a result, the locking tabs, together with the heat sink, can be produced in one production step. According to an alternative embodiment of the illumination device according to the invention, the locking tabs are formed as part of a mounting ring, which is mounted on the heat sink. The mounting ring opens up additional adjustment options. In particular, the mounting ring allows a so-called 5-axis or 6-axis adjustment. In other words, within the reference plane defined by the locking tabs, the alignment of the light-emitting diodes or the primary optics with respect to the locking tabs, for example, by turning the mounting ring with respect to. The heat sink about its ring axis and subsequent Fixation in this position, be set. In addition, the installation depth of the light-emitting diodes or the primary optics in the holder for the illumination device, for example, by moving the mounting ring along its axis on the heat sink and subsequent fixing in the position can be adjusted to the desired value. In addition, the angle between the reference plane and the support plate for the LEDs or the mounting surface of the primary optics of the illumination device, for example by tilting the mounting ring and then fixing in the inclined position, can be adjusted.
  • Advantageously, at least one of the locking tabs has a shape that deviates from the shape of the other locking tabs. This allows a clear definition of the mounting position of the lighting device in its holder. In addition, the shape of the locking tabs can be used to code different types of lighting devices by providing different types of lighting devices with differently shaped locking tabs.
  • In order to ensure a reliable press fit of the lighting device in its holder, a spring ring is advantageously provided, which acts as an abutment to the locking tabs in the locking of the bayonet closure.
  • According to a particularly preferred embodiment of the invention, the illumination device has an electrical connection with at least one metallic contact web which extends perpendicular to the axis of rotation of the bayonet closure, so that by the rotational movement when locking or unlocking the bayonet closure of the electrical contact between the at least one metallic contact bar and its mating contact is made or dissolved. Characterized the electrical contact between the electrical connection of the lighting device and the socket contacts their power supply is made simultaneously with the locking of the bayonet closure. Especially No further action is required to connect the lighting device to the power supply after mounting in its holder.
  • The lighting device according to the invention is used for example as a light source in a vehicle lamp, preferably in the vehicle headlight. For example, several of the lighting devices according to the invention may be arranged in a holder in a vehicle headlight in order to realize light distributions for different applications. By turning on the aforementioned lighting devices in different combinations, for example, parking lights, daytime running lights, dipped beam, high beam, fog light, etc., can be realized with this vehicle headlight.
  • The vehicle headlight according to the invention has at least one illumination device arranged in a holder of the vehicle headlight, which has at least one light-emitting diode and a heat sink for the at least one light-emitting diode, and light-directing means for the light generated by the at least one illumination device, wherein the heat sink is provided with first locking means, which form a bayonet lock with second locking means on the holder. The plug-in rotary movement of the bayonet fitting, which is required in the bayonet closure for establishing the connection between the lighting device and its holder, a reliable attachment of the at least one lighting device is ensured in its holder in the vehicle headlight. In addition, an adjustment of the LEDs or the primary optics of the illumination device with respect to the light-guiding means of the vehicle headlight is thereby made possible. In the simplest case, the light-guiding means is a reflector, for example a free-form surface reflector, or an optical system with light guides and / or optical lenses or a combination of a reflector with such an optical system.
  • Advantageously, in the vehicle headlamp according to the invention, the first locking means comprise at least three locking tabs which are arranged along a circular arc, and the second locking means comprise a mounting opening in the holder for the illumination device, the edge of which fits Has recesses for the at least three locking tabs. In addition, the second locking means comprise a stop for at least one of the locking tabs, which serves to limit the rotational movement when locking the bayonet closure. As a result, a correct position installation of the lighting device is ensured in the space provided holder of the vehicle headlight.
  • Advantageously, the second locking means also comprise a ramp-shaped web at the edge of the mounting opening in order to prevent an automatic unlocking of the bayonet closure.
  • Advantageously, the at least one illumination device of the vehicle headlamp is provided with an electrical connection having at least one contact web extending perpendicular to the axis of rotation of the bayonet closure, so that by the rotational movement when locking or unlocking the bayonet closure of the electrical contact between the at least a contact bar and a mating contact on the vehicle headlight is made or dissolved. As a result, no further handle is required to connect the at least one lighting device after installation in its retaining ring to the power supply.
  • III. Description of the preferred embodiments
  • The invention will be explained in more detail below with reference to a few preferred embodiments. Show it:
  • FIG. 1
    A plan view of the front of a lighting device according to the first embodiment of the invention
    FIG. 2
    A plan view of the back of the illumination device according to the first embodiment of the invention
    FIG. 3
    A representation of the mounting opening in the vehicle headlight, which in the FIGS. 1 . 2 . 5 and 6 matched embodiments is tuned
    FIG. 4
    A side view of a lighting device according to the second embodiment of the invention
    FIG. 5
    A side view of a lighting device according to the third embodiment of the invention
    FIG. 6
    A plan view of the back of the illumination device according to the third embodiment of the invention
    FIG. 7
    A cross section through a lighting device according to the fourth embodiment of the invention
    FIG. 8
    A cross section through a lighting device according to the fifth embodiment of the invention
  • In the FIGS. 1 and 2 the illumination device according to the first embodiment is shown. This lighting device has a heat sink 1 with a circular disk-shaped mounting surface 10 and parallel cooling fins 11, 12, 13, 14, 15, 16, which extend perpendicular to the mounting surface 10. The heat sink 1 is formed as a one-piece die-cast aluminum part. The outer contour of the heat sink 1 substantially corresponds to that of a circular cylinder, apart from the cavities between the cooling fins 11 to 16 and the locking tabs 17, 18, 19, which are part of a bayonet between the lighting device and a vehicle headlight. The three locking tabs 17, 18, 19 are arranged equidistantly along the circumference of the circular cylindrical mounting surface 10 at a distance of 120 degrees. They are directed radially outward. The two locking tabs 17, 18 have the same shape, but mirror-symmetrically with respect to. The diameter of the mounting surface 10 are arranged, which extends centrally through the third locking tab 19. The locking tab 19 has a different shape than the first 17 and second locking tab 18 to ensure a clear orientation and installation position of the illumination device in the vehicle headlight. The two outer cooling fins 11 and 16 have on their outer surface a profile 11a and 16a, respectively, in order to ensure a better grip when operating the bayonet closure. to ensure this. In addition to the locking tab 19, the mounting surface 10 has a recess 102 to provide space for mounting a lateral, acting perpendicular to the axis of rotation of the bayonet fitting pressure spring 103. The pressure spring 103 is disposed between the locking tab 19 and the spring ring 101. She is in the presentation of FIG. 1 covered by the locking tab 19.
  • On the mounting surface 10 of the heat sink 1 is a support plate 2, for example, a so-called metal core board, fixed for a total of five LED chips 3 (also called LED chips). In the metal core board 2 is a metal plate, which is provided with an electrical insulation, such as ceramic. On the electrical insulation of the metal core board 2 printed conductors 21 are arranged for electrical contacting of the LED chips 3. The support plate or metal core plate 2 ensures electrical insulation between the metallic heat sink 1 the LED chips 3. The support plate 2 is mechanically, for example, by clamping fit in a recess of the heat sink 1 or by means of a snap connection or with the aid of an adhesive on the mounting surface 10 of Heatsink 1 anchored. For alignment and correct mounting of the support plate 2 on the mounting surface 10 of the heat sink 1, for example, two holes in the mounting surface 10 may be mounted, in each of which engages a properly shaped pin on the underside of the support plate 2. These holes can also define the orientation and mounting position of the carrier plate 2 with respect to the locking tabs 17-19. The five light-emitting diode chips 3 are arranged in a row on the carrier plate 2 and surrounded by the walls of a so-called potting trough 4, so that the row consisting of the five light-emitting diode chips 3 is arranged at the bottom of the potting pan 4. The Vergusswanne 4 is partially filled with a translucent, the light-emitting diode chips 3 covering potting compound, for example, contains two different phosphors to convert the wavelength of a portion of the generated by the LED chips 3 electromagnetic radiation, so that the illumination device emits white light during their operation. Such phosphors are for example in the WO 98/12757 described. The light emitting diode chips 3 facing surface 4 a of the walls of the Vergusswanne 4 is formed so that they of the Vergusswanne 4 is formed so that they reflect the light emitted by the LED chips 3 electromagnetic radiation. The light-emitting diode chips 3 are, for example, thin-film light-emitting diode chips whose basic principle is described, for example, in the publication I. Schnitzer et al., Appl. Phys. Lett. 63 (16), 18 October 1993, 2174-2176 is described. The five light-emitting diode chips 3, together with the potting compound and the phosphors integrated therein, form five light-emitting diodes. However, the term light-emitting diode also includes those diodes which emit during operation electromagnetic radiation from the ultraviolet or infrared wavelength range, which is converted by suitable conversion means into electromagnetic radiation from the visible wavelength range.
  • The support plate 2 has four holes 22, in each of which a suitably matched thereto pin 52 of serving to reduce the divergence of the emitted light emitting diode chips 3 electromagnetic radiation primary optics 5 (in FIG. 4 shown) or a holder for the primary optics 5 engages. As a result, the primary optics 5 are fixed to the carrier plate 2 by means of the pins 52 and their mounting position and orientation with respect to the carrier plate 2 and thus also with respect to the locking tabs 17 to 19 fixed. Preferably, the holes 22 are fittingly arranged over corresponding holes in the mounting surface 10 of the heat sink 1, so that the pins 52 of the primary optics 5 are passed through the holes 22 of the support plate 2 and engage in the aforementioned holes in the heat sink 1. As a result, in addition to the primary optics 5, the carrier plate 2 is also fixed and aligned on the heat sink 1 by means of the dowel pins 52. In this case, no separate means for mounting on the mounting surface 10 of the heat sink 1 are required for the support plate 2. In order to set the distance of the primary optics 5 on the underlying LED chips 3 to the correct value, one or more spacers may be provided between the primary optics 5 and the support plate 2 or the mounting surface 10, which limit the penetration depth of the pins 52 in the holes 22. Primary optics is a composite optical concentrator similar to the optical concentrator 5 of in FIG. 4 illustrated embodiment of the invention is trained. One end of this optical concentrator, 5 engages in the Vergusswanne 4 and is optically coupled to the LED chips 3, for example by means of Canada balm. The optical concentrator 5 concentrates the light generated by the light-emitting diode chips 3, so that it emerges from the end face 51 of the concentrator 5 facing away from the light-emitting diode chips 3 with reduced divergence. The optical concentrator 5 is, for example, a Compound Parabolic Concentrator (CPC) or a Compound Ellyptic Concentrator (CEC) or a Compound Hyperbolic Concentrator (CHC). The primary optics 5 is arranged with respect to the LED chips 3 in a well-defined position and orientation on the heat sink 1 or on the carrier plates 2. The primary optics 5 is matched to the optics of the vehicle headlight (secondary optics).
  • The electrical components required for the operation of the LED chips 3 are arranged on a mounting plate 6 designed as a lead frame. The assembled with the aforementioned electrical components (not shown) mounting plate 6 is a matching recess of the middle fin 14 is arranged and fixed. The mounted on the mounting plate 6 electrical components protrude into the space between the mounting plate 6 and the adjacent cooling fins 13 and / or 15. On the mounting plate 6, the electrical connection 7 of the lighting device is also mounted. The electrical terminal 7 is formed as a socket with four contact pins 71, which is provided for receiving a connector adapted thereto. Two of the contact pins 71 serve to supply power to the series-connected LED chips 3, and two more of the contact pins 71 serve to supply voltage to a temperature sensor. By means of the socket 7, the arranged on the mounting plate 6 electrical components are supplied with electrical energy. The consisting of the aforementioned electrical components power supply circuit of the LED chips 3 by means of power supply lines (not shown), which are passed through the opening 100 in the mounting surface 10 and contacted with the tracks 21 on the support plate 2, electrically connected to the LED chips 3.
  • In the FIG. 3 schematically is a holder 30 for in the FIGS. 1 . 2 . 5 . 6 . 7 and 8th illustrated embodiments of the illumination device according to the invention. This holder 30 is part of the vehicle headlight and is located for example on the side facing away from the light exit opening of the vehicle headlight reflector back of the vehicle headlight reflector. For example, at the back of the aforementioned reflector, a holder 30 with the in FIG. 3 can be provided 300 shown assembly opening. The edge of the mounting opening 300 is provided with matching recesses 301, 302, 303 for the locking tabs 17, 18, 19 of the lighting device. At the edge of the mounting opening 300, a stop 304 for the locking tab 19 and a ramp 305 are further arranged. The mounting opening 300 with the recesses 301 to 303 and the stop 304 and the ramp 305 together with the locking tabs 17 to 19 a bayonet between the illumination device and the holder 30 of the vehicle headlight. To actuate the bayonet closure, the lighting device with its mounting surface 10, which forms the projecting into the reflector of the vehicle headlight front of the lighting device, attached to the holder 30, wherein the locking tab 19 in the recess 303, the locking tab 17 in the recess 301 and the locking tab 18 engage in the recess 302 and the front 10 of the illumination device including the locking tabs 17 to 19 protrude through the mounting hole 300 so that the back of the holder 30 abuts the spring ring 101 on the heat sink 1. By means of a rotary movement, the illumination device is rotated relative to the section 30 by approximately one quarter turn, so that the locking tab 19 slides over the ramp 305 and bears against the stop 304. The stopper 304 prevents further rotational movement in the screwing direction. The ramp 305 complicates a rotational movement in the direction of rotation and prevents an automatic unlocking of the bayonet lock. The pressure spring 103 is in the region between the stopper 304 and the ramp 305 at the edge of the mounting hole 300 with a press fit. Due to the spring action of the pressure spring 103, the illumination device is pressed against the obliquely mutually extending edge regions 306, 307 of the mounting opening, so that the illumination device at three portions of the edge of the Mounting opening 300 is supported and thus secured against movement in the flange plane. The holder 30 or the edge of the mounting opening 300 is arranged in the locked state of the bayonet lock with a press fit between the locking tabs 17 to 19 and the spring ring 101. The three locking tabs 17 to 19 lie in a common plane, which forms a reference plane for the alignment of the LED chips 3 and the primary optics 5 with respect to the reflector of the vehicle headlight. That is, the orientation of the LED chips 3 and 5 of the primary optics on the heat sink 1 ensures in conjunction with the above-described bayonet between the holder 30 and the illumination device according to the invention a clearly defined mounting position of the light source or light sources in the vehicle headlight.
  • In FIG. 4 a lighting device according to a second embodiment of the invention is shown. This illumination device has a heat sink 400 with a circular disk-shaped mounting surface 401 and parallel cooling fins 402, which extend perpendicular to the mounting surface 401. The heat sink 400 is formed as a one-piece die-cast aluminum part. The outer contour of the heat sink 400 substantially corresponds to that of a circular cylinder, apart from the cavities between the cooling fins 402. Along a circle, three recesses 403 are arranged on the mounting surface 401 in the surface of the heat sink 400 at an angular distance of 120 degrees. These recesses 403 are part of a bayonet closure between the illumination device and the vehicle headlight, in which the illumination device is used. One of the three recesses 403 has a shape that deviates from the shape of the other two recesses 403 to set a unique mounting position in a holder of the vehicle headlamp for the lighting device. On the mounting surface 401 three support plates 404, 405, 406 are fixed for each five LED chips (also called LED chips). The carrier plates 404, 405, 406 are arranged in a row, so that a total of fifteen light-emitting diode chips are arranged in a row on the front side 401 of the heat sink 400. The two outer support plates 404, 406 are each mounted on a slope of the mounting surface 401 of the heat sink 400. The LED chips are, as in the first embodiment is described ( FIG. 1 ), arranged in a Vergusswanne 407 and are in the representation of FIG. 4 obscured by primary optics 5. The primary optics 5 has a plurality of molded pins or dowel pins 52, by means of which it is anchored in holes in the heat sink 400. The primary optics 5 engages in the Vergusswannen 407, is optically coupled to the arranged in the Vergusswannen 407 LED chips and their spatial position and orientation is adjusted by means of the pins or dowel pins 52 with respect to the support plates 404-406. The light generated by the LEDs exits the light exit opening 51 of the primary optics 5 with reduced divergence. The electrical components for operating the light-emitting diode chips are mounted on a mounting plate 408 designed as a lead frame, which is arranged in a recess of the heat sink 400 in the region of the mounting surface 401. The mounting plate 408 covers the aforementioned recess in the heat sink 400. It is practically designed as a cover for this recess. The electrical components are mounted on the underside of the mounting plate 408, so that the electrical components protrude into the recess. In the presentation of the FIG. 4 the top of the mounting plate 408 is visible. The depth of the aforementioned recess is matched to the height of the mounted on the mounting board 408 electrical components. In a second recess on the edge of the mounting surface 401 designed as a socket 409 electrical connection of the lighting device is arranged. Via the contact pins of the socket 409, the electrical components mounted on the mounting plate 408 are supplied with electrical energy. The circuit arrangement formed by the electrical components on the mounting plate 408 serves to power the LED chips. At the edge of the mounting plate 408 facing the support plates 404, 405, 406, electrical contacts 410 are provided for contacting the light-emitting diode chips arranged on the support plates 404 to 406.
  • The primary optics 5 of the illumination device is tuned to the downstream secondary optics of the vehicle headlight. The secondary optics can be a reflector, for example a free-form surface reflector, an optical lens system or a combination of an optical lens system with a reflector.
  • In the Figures 5 and 6 a third embodiment of the illumination device according to the invention is shown. This lighting device is largely identical to the lighting device according to the first embodiment, which in the FIGS. 1 and 2 is shown. Therefore, in the corresponding FIGS. 1 and 2 and FIGS. 5 and 6 also use the same reference numerals for identical parts of the two embodiments. For the description of these parts, reference is made to the description of the corresponding parts of the first embodiment. The illumination device according to the third embodiment differs from that according to the first embodiment only by the different design of the electrical connection 7 '. The electrical connection 7 'of the illumination device is mounted on the mounting plate 6. It has four metallic contact webs 71 ', which are arranged in the cavity between the cooling ribs 13 and 14 and extend in the radial direction of the substantially circular-cylindrical heat sink 1. In particular, the contact webs 71 'extend parallel to the cooling ribs 11 to 16 and project beyond the cooling ribs 11 to 16, so that the free ends of the contact webs 71' protrude from the heat sink 1. When mounting the illumination device in the mounting opening 300 of the holder 30 (FIG. FIG. 3 ), that is, during the locking of the bayonet closure, the contact webs 71 'are rotated into the contact position with their mating contacts on the vehicle headlight. By locking the bayonet lock so that the electrical contact between the lighting device and the vehicle electrical system voltage of the vehicle is produced. When unlocking the bayonet lock the corresponding electrical contact to the power supply is automatically interrupted accordingly.
  • In the FIG. 7 the illumination device according to the fourth embodiment of the invention is shown in a sectional side view. This lighting device is largely the same as that of the first embodiment. It differs only from the first embodiment that the heat sink 700 has no molded-on locking tabs, but instead a fastening ring 706 is provided, which is equipped with the three locking tabs 710 of the bayonet closure. One of the three locking tabs 710 has the same shape as that in FIG FIG. 1 pictured locking tab 19 on while the other two locking tabs 710 take the form of in FIG. 1 have shown locking tabs 17 and 18 have. The heat sink 700 is made of a metal of high thermal conductivity, for example of an aluminum die-cast part, and has a plurality of cooling fins 701 and a circular cylindrical portion 702, to which the fastening ring is fixed by means of three, along the ring circumference uniformly distributed welding flaps 707. The fastening ring 706 is made, for example, of plastic, in which one end of the welding straps 707 is embedded, while the other end of the welding straps 707 is welded to the circular-cylindrical section 702 of the cooling body 700. The fastening ring 706 is further equipped with a spring ring 709 and a lateral pressure spring 708, which has the same function as in FIG. 5 imprinted spring ring 101 and the pressure spring 103 exercise. On the mounting surface of the heat sink 700, a support plate 704 with light-emitting diode chips 703 and a surrounding the LED chips 703 Vergusswanne 705 are arranged. In addition, a primary optic 5 (in FIG. 4 imaged) is arranged on the heat sink 700 via the light-emitting diode chip 703, which is optically coupled to the light-emitting diode chip 703. The fixing ring 706 offers, as already explained above, additional adjustment possibilities. After the adjustment of the mounting ring 706 is fixed by welding the welding lugs 707 with the circular-cylindrical heat sink portion 702 in the desired position and orientation. The three Verriegelunsslaschen 710 of the mounting ring 706 together with the mating recesses 301 to 303 at the edge of the mounting hole 300 of in FIG. 3 illustrated bracket 30 a bayonet lock.
  • In the FIG. 8 the illumination device according to the fifth embodiment of the invention is shown in a sectional side view. This lighting device is largely the same as that of the fourth embodiment. It differs from the fourth embodiment only by the manner of fixing the mounting ring 806 on the heat sink 800. The heat sink 800 is made of a metal of high thermal conductivity, for example, an aluminum die casting, and has a plurality of cooling fins 801 and a circular cylindrical portion 802 on which the fastening ring 806 by means of a metal ring 807a, which is embedded in the plastic fixing ring 806, and a plastic ring 807b, which is arranged in an annular groove on the circular-cylindrical heat sink section 802, is fixed. To fix the mounting ring 806 on the heat sink 800 in the desired position and orientation, a current flow is caused by the adjustment in the metal ring 807a by electromagnetic induction, which heats the metal ring 807a, so that the attached thereto plastic ring 807b melts. The current flow is maintained only for a short time, so that the plastic of the plastic ring 807b immediately solidifies again and then produces a positive connection between the mounting ring 806 and the heat sink section 802. The mounting ring 806 is equipped with the three locking tabs 810 of the bayonet fitting. One of the three locking tabs 810 has the same shape as that in FIG FIG. 1 shown locking tab 19, while the other two locking tabs 810, the shape of in FIG. 1 have shown locking tabs 17 and 18 have. The three locking tabs 810 of the mounting ring 806, together with the matching recesses 301 to 303 at the edge of the mounting hole 300 of in FIG. 3 illustrated bracket 30 a bayonet lock. The mounting ring 806 is further provided with a spring ring 809 and a lateral pressure spring, which has the same function as in FIG. 5 imprinted spring ring 101 and the pressure spring 103 exercise. On the mounting surface of the heat sink 800, a support plate 804 with light-emitting diode chips 803 and a surrounding the light-emitting diode chips 803 Vergusswanne 805 are arranged. In addition, a primary optic 5 (in FIG. 4 imaged) is arranged above the light-emitting diode chip 803 on the heat sink 800, which is optically coupled to the light-emitting diode chips 803. The fixing ring 806 offers, as already explained above, additional adjustment possibilities.
  • The invention is not limited to the embodiments explained in more detail above. For example, instead of the white light-emitting light-emitting diodes, infrared-emitting light emitting diodes can also be used in order to use such a lighting device, for example for generating an infrared high beam, in a vehicle headlight. You can also use colored light emitting LEDs are used to use the lighting device as a light source in rear lights of the vehicle, for example, as a return, brake or flashing light, etc. In addition, the illumination device according to the invention can also be used as a light source in other luminaires, which require an adjustment of the light source with respect to an optical system of the luminaire.
  • The locking tabs may not necessarily be disposed in a common plane, as described in the preferred embodiments. Instead, they can also be arranged in different planes in order, for example, to be able to easily encode different types of illumination devices. The number and shape of the locking tabs can also be varied to allow coding of different types of lighting devices. The aforementioned coding can also be ensured by different shape and spatial arrangement of the contact webs 71 or 71 'of the electrical connection 7 or 7'.
  • The cooling of the illumination device according to the invention or of the vehicle headlight according to the invention can be assisted, for example, by means of a fan or blower. The illumination device according to the invention or the vehicle headlight according to the invention may additionally or instead also comprise a Peltier element for supporting the cooling, whose cold surface is thermally coupled, for example, to the carrier plate of the light-emitting diode chips and whose warm surface is thermally coupled to the heat sink. This allows a smaller heat sink to be used.

Claims (8)

  1. Illumination device having at least one light-emitting diode (3; 703; 803) and a heat sink (1; 400; 700; 800) for the purpose of cooling the at least one light-emitting diode (3; 703; 803), wherein the heat sink (1; 400; 700; 800) is provided with latching means (17, 18, 19; 403; 710; 810) which serve the purpose of forming a bayonet-type lock with a holder (30) for the illumination device, and the latching means comprise at least two latching tabs (17, 18, 19; 710; 810) which are arranged along a circular arc, characterized in that at least one latching tab (19) has a shape which is different than the shape of the other latching tabs (17, 18).
  2. Illumination device according to Claim 1, characterized in that the latching tabs (17, 18, 19) are integrally formed on a section of the heat sink (1) with a circular-cylindrical geometry.
  3. Illumination device according to Claim 1, characterized in that the latching tabs (710; 810) are formed as part of a fixing ring (706; 806) which is mounted on the heat sink (700; 800).
  4. Illumination device according to one or more of Claims 1 to 3, characterized in that a spring ring (101; 709; 809) is provided which acts as an opposing bearing with respect to the latching tabs (17, 18, 19; 710; 810) when the bayonet-type lock is latched.
  5. Illumination device according to one or more of Claims 1 to 4, characterized in that the at least one light-emitting diode (3; 703; 803) is arranged in a defined position and alignment with respect to the latching means (17, 18, 19; 403; 710; 810) arranged on the heat sink (1; 400; 700; 800).
  6. Illumination device according to one or more of Claims 1 to 5, characterized in that the illumination device is provided with an optical means (5), coupled to the at least one light-emitting diode (3), for the purpose of reducing the divergence of the electromagnetic radiation emitted by the at least one light-emitting diode (3), the optical means (5) being arranged in a defined position and alignment with respect to the latching means (17, 18, 19) arranged on the heat sink (1).
  7. Illumination device according to Claim 6, characterized in that the optical means (5) is a compound optical concentrator from the group consisting of the compound parabolic concentrator (CPC), the compound elliptic concentrator (CEC) and the compound hyperbolic concentrator (CHC).
  8. Illumination device according to Claim 1, characterized in that the illumination device has an electrical connection (7') having at least one metallic contact web (71') which extends perpendicularly with respect to the axis of the rotary movement of the bayonet-type lock, with the result that, owing to the rotary movement when the bayonet-type lock is latched or unlatched, the electrical contact between the at least one contact web (71') and its opposing contact is produced or released.
EP05822978.2A 2004-12-22 2005-12-01 Lighting device comprising at least one light-emitting diode and vehicle headlight Active EP1828671B1 (en)

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DE102004062990A DE102004062990A1 (en) 2004-12-22 2004-12-22 Lighting device with at least one light emitting diode and vehicle headlights
PCT/DE2005/002169 WO2006066530A1 (en) 2004-12-22 2005-12-01 Lighting device comprising at least one light-emitting diode and vehicle headlight

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EP1828671A1 EP1828671A1 (en) 2007-09-05
EP1828671B1 true EP1828671B1 (en) 2015-07-15

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EP (1) EP1828671B1 (en)
JP (1) JP4778523B2 (en)
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DE (1) DE102004062990A1 (en)
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US7621667B2 (en) 2009-11-24
TWI358512B (en) 2012-02-21
DE102004062990A1 (en) 2006-07-06
EP1828671A1 (en) 2007-09-05
TW200632248A (en) 2006-09-16
CN101087976A (en) 2007-12-12
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CN101087976B (en) 2010-06-16
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JP2008524862A (en) 2008-07-10
JP4778523B2 (en) 2011-09-21

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