WO2009144024A1 - Fahrzeugbeleuchtungsvorrichtung mit mindestens zwei halbleiter-leuchtelementen - Google Patents
Fahrzeugbeleuchtungsvorrichtung mit mindestens zwei halbleiter-leuchtelementen Download PDFInfo
- Publication number
- WO2009144024A1 WO2009144024A1 PCT/EP2009/003827 EP2009003827W WO2009144024A1 WO 2009144024 A1 WO2009144024 A1 WO 2009144024A1 EP 2009003827 W EP2009003827 W EP 2009003827W WO 2009144024 A1 WO2009144024 A1 WO 2009144024A1
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- WIPO (PCT)
- Prior art keywords
- light
- lighting device
- emitting element
- vehicle lighting
- vehicle
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/28—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating front of vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/18—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights being additional front lights
- B60Q1/20—Fog lights
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/151—Light emitting diodes [LED] arranged in one or more lines
- F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
- F21S41/255—Lenses with a front view of circular or truncated circular outline
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
- F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
- F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2400/00—Special features or arrangements of exterior signal lamps for vehicles
- B60Q2400/20—Multi-color single source or LED matrix, e.g. yellow blinker and red brake lamp generated by single lamp
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2400/00—Special features or arrangements of exterior signal lamps for vehicles
- B60Q2400/30—Daytime running lights [DRL], e.g. circuits or arrangements therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2113/00—Combination of light sources
- F21Y2113/10—Combination of light sources of different colours
Definitions
- Vehicle lighting device with at least two semiconductor lighting elements
- the invention relates to a vehicle lighting device having at least two semiconductor light-emitting elements, in particular light-emitting diodes, and a vehicle having at least one such vehicle lighting device.
- bilux lamps or bi-xenon-duster are known, of which both dipped and high beam is generated. In the bi- xenon duster only one aperture is folded out of the beam path and thus "switched" to high beam. It is also a bilux lamp for combining daytime running and fog light known.
- the vehicle lighting device has at least two semiconductor lighting elements, at least one first Luminous element group and a second light-emitting element group, each having at least one semiconductor light-emitting element, wherein the light-emitting element groups selectively, ie selected, are controllable. Furthermore, at least the first luminous element group has at least one fog light function.
- the vehicle lighting device thus has a plurality of lighting elements that can be operated in at least two different lighting or lighting configurations, of which at least one is suitable for generating a fog light.
- a lighting configuration may include, for example, an on / off state and / or a predetermined lighting state.
- the luminous intensity state can be achieved, for example, by setting an operating current through the luminous element, for. B.
- the first lighting element group generates or emits at least part of a fog light, possibly together with at least one other lighting element group of the vehicle lighting device, which has a fog light function.
- a plurality of light functions including a fog light function, can be integrated in a vehicle lighting device in a simple and cost-effective manner, which saves space and costs.
- the device thus has a daytime running function, which is provided by activation of the first light-emitting element group and the second light-emitting element group.
- the first light-emitting element group and the second light-emitting element group can, with appropriate activation, generate a daytime running light (DRL).
- the first light-emitting element group thus has at least two functions, namely for generating a fog light and for generating a daytime running light, while the second light-emitting element group has at least one daytime running light function. When the daytime running light function is activated, therefore, the first lighting element group and the second lighting element group are activated together.
- the first light element group during activation of the daytime running light function with lower luminous intensity than when activating the fog light function.
- This can be done, for example, by reducing the luminous intensity of each of the associated luminous elements ("dimming"), which is preferred, or by selectively switching off individual luminous elements.
- the second light-emitting element group in the daytime running light function illuminates a region which lies in a dark region of the fog light function of the first light-emitting element group.
- the first lighting element group and the second lighting element group can have a high beam function.
- the first lighting element group illuminates with a luminous intensity which corresponds approximately to the luminous intensity when the fog light function is activated, in particular a maximum luminous intensity by the lighting elements involved.
- the second light-emitting element group also has a daytime running light function, it is preferred if it illuminates with a lower luminous intensity during the activation of the daytime running light function than when the high-beam light function is activated.
- the vehicle lighting device may further comprise a third light-emitting element group and / or a fourth light-emitting element group, each having at least one semiconductor light-emitting element, which has a cornering function for a respective opposite steering movement and / or have a fog light function.
- the third light-emitting element group and / or the fourth light-emitting element group have a (dynamic or static) cornering function for a respective opposite steering movement.
- the third light-emitting element group can be activated to turn to the left and the fourth light-element group to turn right.
- z As the speed, the steering angle and the yaw rate of the vehicle to control a bending or bending ⁇ bending light can be used. This happens z. B. in a control unit of the vehicle electronics, which then passes on the necessary signals to light element driver.
- the switch for the direction indicator can also be used as input for the algorithm.
- the third light-emitting element group or the third and the fourth light-emitting element group can be activated when the fog light is activated, ie have a fog light function, while they are not activated when the main beam is activated, ie have no high-beam function.
- the third light-emitting element group and / or the fourth light-emitting element group have a plurality of semiconductor light-emitting elements which can be activated in each case at least as a function of an associated steering angle.
- the light elements of the third light-emitting element group and / or the fourth light-emitting element group can in particular be successively switchable.
- the first light-emitting element group has a cornering light function.
- the first light-emitting element group has a plurality of light-emitting elements which can be activated independently of the other light-emitting elements of the first light-emitting element group and in a plurality of stages.
- an associated illumination region is enlarged, in particular laterally widened.
- some of the luminous elements can be successively activated towards the edge, in particular in steps of a lateral luminous element spacing.
- first light-emitting element group and the second light emitting element group have no common ⁇ Sames semiconductor light emitting element.
- At least the first luminous element group and the second luminous element group have at least one common semiconductor luminous element.
- first light-emitting element group and the second light-emitting element group do not have a common semiconductor light-emitting element
- the first light-emitting element group and the second light-emitting element group have at least one common semiconductor light-emitting element
- the common semiconductor light-emitting elements can be used at several Emitting types of lighting, possibly with different light intensities.
- At least one semiconductor light-emitting element comprises a white (cold-white or warm-white), yellow or white-yellow emitting semiconductor light-emitting element.
- At least one semiconductor light-emitting element comprises at least one light emitting diode, in particular a white light emitting diode.
- the white-emitting light-emitting diode comprises a conversion LED in which a part of a primary blue-emitted light is converted into yellow light by means of a light-emitting means in order to produce a white light.
- the light-emitting diode can be present, for example, as an LED chip or as an LED lamp. In contrast to LED chips, LED lamps are housed one at a time and often have a reflector in their housing.
- the at least one LED comprises a set of differently colored light emitting diodes ("LED cluster"), which are controlled so that their light gives a white mixed light.
- the set of differently colored light-emitting diodes comprises at least one red-emitting light emitting diode, a green light emitting diode and a blue light emitting diode, in particular, if the set of differently colored light emitting diodes to produce a 'warm-white' hue further at least one amber ('amber') luminous LED includes.
- the set of light-emitting diodes has a common optical system, in particular lens se, for beam shaping and / or beam homogenization, downstream.
- the luminous elements of at least one of the luminous element groups are arranged in at least one row, for.
- n elements lxn -
- Matrix or in matrix form with m rows of n elements (mxn
- the arrangement may be another, z. B. non-matrix, such as, for. B. round or oval, polygonal, in particular triangular and more than rectangular and so on.
- the luminous elements of at least two of the luminous element groups are arranged in at least one row and the rows of these luminous element groups are arranged parallel to each other, in particular in a horizontal arrangement with each other (line form) with or without spacing, or in a vertical arrangement next to each other (Column shape) with or without distance.
- semiconductor light-emitting elements of at least the first light-emitting element group and the second light-emitting element group on a common substrate are mounted.
- one or more substrates may be populated with luminescent elements of the first and second groups;
- substrates with luminous elements only of the first group and / or only of the second group may additionally be present.
- all the semiconductor light-emitting elements of at least the first light-emitting element group and the second light-emitting element group are mounted on a common substrate.
- Semiconductor light-emitting elements of further groups may also be present.
- the light-emitting elements can be distributed over different substrates, it is preferred if all half-light elements conductor lighting elements are mounted on a common substrate.
- the substrate may be a printed circuit board or a submount.
- the substrate is designed as a submount, in particular as a ceramic submount, z. B. AlN.
- Em Submount serves primarily as a carrier and heat sink for the lighting elements.
- the submount is particularly preferred for mounting LED chips.
- the submount consists preferably of good heat-conducting and electrically insulating material, eg. AlN.
- the submount carries one or more LED chips, preferably LED chips, which are applied to the submount in the surface mounting technique; their emitter surface is essentially parallel to the surface of the submount.
- LED chips may be similar or different.
- groups of differently designed light-emitting diodes can be used for each of the lighting elements (here: LEDs).
- LED chips with differently sized emitter surfaces are used for at least two of the LED groups.
- a footprint area of the first light-emitting element group is asymmetrical with respect to a lateral extent.
- the device further comprises at least one optical system connected downstream of at least one semiconductor light-emitting element for shaping a light distribution of the light emitted by the at least one semiconductor light-emitting element. It is preferred for uniform illumination when the at least one optic is designed for homogenizing the light emitted by the at least one semiconductor luminous element.
- the homogenization comprises a color homogenization of the light emitted by the at least one semiconductor luminous element, in particular when white mixed light of differently colored luminous elements is used.
- the homogenization comprises an intensity homogenization of the light emitted by the at least one semiconductor waveguide light.
- the at least one optical system is designed for the concentration in areas of the light emitted by the at least one semiconductor light-emitting element, for. To achieve a particular shape of the imaging area. Within the area in which the light is concentrated, this can preferably be made homogeneous.
- the at least one optic comprises an imaging optic, in particular a lens, for imaging or shaping the light emitted by the at least one semiconductor luminous element onto the associated luminous area.
- two or more optics with different functions can be connected one after the other, for.
- an optical system is connected downstream of all light-emitting element groups, that is to say represents a common Op ⁇ tik for all lighting elements.
- the optics comprises a reflector.
- the optic comprises a light guide.
- the vehicle lighting device further comprises a drive circuit, in particular a driver, for operating at least two light-emitting element groups, preferably for operating all light-emitting element groups.
- a drive circuit in particular a driver
- each group can in extreme cases have its own control electronics, but this is expensive.
- the drive circuit is mounted on a substrate and is provided for group-specific operation of semiconductor light elements likewise mounted on this substrate. But it can also be arranged separately, z. B. on a circuit board, which also carries the submount or submounts.
- a substantially equal load of the semiconductor light-emitting elements is present. This can preferably be achieved by activating an equal number of luminous elements in at least two, particularly preferably all types of illumination. It may be preferred for easy control of the lighting elements, if at least two sets of lighting elements are electrically connected in parallel, which are associated with a different lighting or lighting configuration, is switched to switch between the types of lighting between sentences, z. B. by means of a transistor or other logic circuit. Preferably, all parallel branches have the same load. It is particularly preferred if the lighting elements are in each case electrically connected in series in all parallel branches.
- At least two of the sets of luminous elements connected in parallel in parallel at least one further set of luminous elements is electrically connected in series.
- These luminous elements of the further set are luminous elements which are activated continuously with regard to the types of illumination associated with the parallel branches connected in series with them.
- the light-emitting element groups are electrically connected in series and at least one switch is connected in parallel to each light-emitting element group.
- At least one resistor is connected in series to at least one switch, preferably to each of the switches, since in this way a substantially equal load can be maintained even with a variable number of the luminous elements.
- the light is, optionally together with other lamps, such as for producing a low beam or a turn signal lamp, for use m designed a vehicle headlight and has at least one such vehicle lighting device.
- the vehicle headlight is equipped with at least one such lamp of at least one such vehicle lighting device.
- the vehicle has at least one such vehicle headlight.
- the vehicle is preferably equipped with at least two such vehicle headlights whose footprints of the associated vehicle lighting device are reversed asymmetric with activated fog light function.
- the first vehicle lighting device can be provided on a left side and the second vehicle lighting device can be provided on a right side and a maximum illumination area of the first vehicle lighting device extend further to the left with respect to a longitudinal direction of the vehicle and a maximum illumination area of the second vehicle illumination area extending device to the right with respect to a longitudinal direction of the vehicle.
- the vehicle lighting devices illuminate their respective maximum fog light illumination area.
- the light element groups having a fog light function preferably glow with maximum illumination intensity.
- the daytime running light is switched off or preferably illuminated when a cornering light function is used, during cornering at least that luminescent element group which has a further illumination area laterally extending in the steering direction illuminates a luminescent element group. NEN compared to the straight-ahead in the steering direction laterally widened footprint.
- the area of the widened illumination area is preferably independent of a strength of a steering angle (static curve light).
- the area of the widened illumination area is dependent on a strength of a steering angle such that the illumination area tends to increase, in particular widen, especially until a maximum is reached with a stronger steering angle - paint illumination area (dynamic cornering light).
- a semiconductor light-emitting element system in particular an LED system, can thus be realized with at least two illumination functions or light functions. up to a maximum of 4 lighting functions.
- lighting functions can be realized with a system or a device that builds up at least on daytime running lights, fog lights (Nebelschemwerferlicht), cornering lights, high beam, for example:
- the light source used is preferably an LED module (LED chip (s) on a submount with an associated drive circuit) with at least 2 rows of chips, wherein these rows of chips can be switched and dimmed independently of one another.
- LED module LED chip (s) on a submount with an associated drive circuit
- In front of the rows of chips is preferably an imaging optics (in particular lens) which surrounds the two chip rows forward in front of the vehicle depicts.
- light which does not fall directly on the lens can be supplied to the light distribution by means of a reflector.
- One or more rows form the fog light distribution, ie a light distribution with a light-dark boundary.
- For the daytime running light function preferably one or more additional rows of chips with a specific power are connected, so that a light distribution is also generated above the cut-off line.
- the rows of chips which are responsible for the fog lamp function, are preferably dimmed appropriately, so that overall a homogeneous and the daytime running light controls adapted light distribution is generated.
- the rows of chips may be symmetrical, asymmetrical, of the same size or of different sizes and may contain an identical or different number of chips or may even have only one chip at a time.
- the fog light distribution or arrangement can be designed so that the requirement of the cornering light is met.
- this may mean that when the fog light is on, both mounting sides of the vehicle illuminate, while with the fog light switched off and dipped headlights on (and thus switched off DRL) only the lamp corresponding to the steering angle is activated. For example, if you steer to the right, only the right-hand side of the vehicle lights up on the vehicle. This can also be carried out in such a way that different numbers of LEDs are activated depending on the steering angle, so as to achieve a dynamic illumination of the cornering light.
- a 'primary optic' which (a) mixes the light of the individual chips to produce e.g. B. to obtain a more homogeneous color o- / / and illumination and / or (b) a light distribution predefined.
- This primary optic can z. B. consist of a reflector and / or a light guide.
- the LED module is preferably connected to electronics such that the various semiconductor emitters (in particular LEDs) used can be operated individually or in several groups together. In principle, each group or each array can be provided with a separate current regulator, which, however, is costly and expensive.
- different LED groups are connected in series and in parallel so that always the same number of chips as a load at the output of an associated driver and for example by switching a 'toggle switch' (in practice preferably by switching transistors realized) the 'geometry' of the chip array or the LED group is changed from linear to square.
- a 'toggle switch' in practice preferably by switching transistors realized
- z For example, place LED groups in series and place a switching transistor in parallel with each of the groups or arrays, which can short-circuit the array so that it is not active.
- a resistor for reducing current can optionally be connected in the parallel branch.
- An advantage of the present invention is that at least two different light functions are generated from a single system (multiple chip rows + optics), in particular at least daytime running lights and fog lights. This results in a smaller footprint, fewer plugs and cables, ie, lower costs.
- the fog light is designed so that the requirements of the cornering light are met, the system can be used, for example, for three light functions, namely in particular for daytime running light, fog light and cornering light. If the system is in the fog or cornering mode, the chips used can be supplied with the maximum power without overheating the system. If the additional chip row (s) required for the daytime running lights is activated, the cooling concept could possibly overload (system or chip becomes too hot). However, due to the dimming of the fog light function, the amount of warming can be reduced so that the system can be designed in daytime running light mode to be within the limits of the cooling concept as a whole (chips do not get too hot).
- FIG. 1A shows a plan view of an LED module of a vehicle lighting device
- FIG. 1B shows an oblique view of LED groups of the LED module from FIG. 1 with a downstream lens of the vehicle lighting device;
- FIG. 2A shows a schematic view of a sketch of a footprint of a first LED group using the vehicle lighting device of FIG. 2;
- FIG. 2B is an oblique view of a sketch of a footprint area of a second LED group using the vehicle lighting device of FIG. 2;
- FIG. 2C is an elevational view of a sketch of a combined footprint of the first and second LED groups using the vehicle lighting device of FIG. 2;
- FIG. 3 shows an oblique view of a sketch of a footprint of a first LED group according to another embodiment similar to the view of FIG 2A;
- FIG. 4 shows an oblique view of elements of a further embodiment of a vehicle lighting device
- FIG. 5 shows a side view of the vehicle lighting device of FIG. 1 with a reflector and a lens
- 6A shows a possible basic circuit diagram of LED groups of a vehicle lighting device
- FIG. 6B shows a plan view of a spatial arrangement of the LED groups from FIG. 6A;
- FIG. 7 shows another possible basic circuit diagram of LED groups of a vehicle lighting device
- FIG. 1A shows, as part of a vehicle lighting device 1, an LED module 2.
- the LED module 2 has a printed circuit board 3 to which an AIN submount 4 is attached.
- On the AIN submount 4 are a first LED group 5 with four arranged in the form of a 2x2 matrix white, surface-mounted LED chips 7 and a directly adjacent second LED group 6 with also four arranged in the form of a 2x2 matrix white surface-mounted LED chips 8 are arranged.
- the LED chips 7 and 8 are therefore arranged in two rows, each with two elements.
- the surfaces of the LED chips 7 and 8 correspond approximately to the emitter surfaces and are not housed individually.
- the emitter surface of the LED chips 7 differs from the emitter surface of the LED chips 8 in that it is made wider and flatter.
- the rows of chips can be generally symmetrical or asymmetrical, as well as the same or different be large and contain an equal or different number of chips or even have only one chip at a time.
- the light emitting diodes 7,8 of the different groups 5, 6 may also be configured differently, for. B. bezüg- borrowed a number of light emitting diodes, luminous intensity of the LEDs, size of the emitter surface and arrangement of the LEDs.
- a control electronics 9 in the form of an electronic driver module which serves to control the LED groups 5.6 and their associated LEDs 7.8.
- the two LED groups are 5.6 independently controlled, z. B. individually or jointly activated.
- the LEDs 7 and 8 belonging to this group 5, 6 are similarly driven or operated in the present exemplary embodiment.
- a luminosity of the LED groups 5 and 6 set by adjusting a guided through the LED chips 7 and 8 operating current.
- certain LED chips 7,8 of a group 5,6 can be activated and deactivated.
- the first group 5 serves both to provide a fog light function or as a fog light source and to provide a daytime running light function or as a light source for a daytime running light.
- the lower, second LED group 6 has a daytime running light function, i. h. that it serves to generate a daytime running light.
- FIG. 1B additionally shows the LED groups 5, 6 of the vehicle lighting device 1 with a common lens 10 connected downstream of them, which serves as a secondary optic, as further will be described in more detail below with respect to FIG.
- the lens 10 By means of the lens 10, the light generated by the LED groups 5, 6 or the light-emitting diodes 7, 8 contained therein is imaged in front of the vehicle in order to generate an associated illumination or illumination area. In particular, this defines a maximum contour of the illuminated area.
- a primary optic such as a primary optic, a diaphragm, etc.
- FIG. 2A shows an illuminated region 11 when activating only the first group 5 of light-emitting diodes for a fog light function.
- FIG. 2B shows an analog representation, in which, however, the second group 6 or its LEDs is activated.
- FIG. 2C shows the illuminated area when the two groups 5, 6 are activated together.
- the first group 5 illuminates with maximum luminosity by supplying maximum power to all four LED chips.
- the luminosity of the first group 5 is set much weaker ("dimmed") in comparison to the activation of the fog-light function in order to exclude dazzling of oncoming traffic or to meet the requirements of the corresponding regulation.
- the dimming The first group 5 can either be done by dimming all LEDs of this group, by dimming individual LEDs of this group or by selectively switching off individual LEDs.
- the light intensity of the second LED group 6 is also so weak that glare is prevented with good visibility at the same time.
- the first group 5 is dimmed so far that there is no sudden change in intensity at the boundary of the illumination area 11 produced by the first LED group 5 via the jointly illuminated area 11, 12. In order to maintain the most homogeneous possible distribution of light intensity in the illumination area 11, which is generated by the first LED group 5, it is preferred if all the LEDs of the first group 5 are activated but dimmed.
- the luminosity of the first group 5 is unchanged in comparison to the activation of the fog-light function.
- the LEDs of the second LED group 6 are maximally energized.
- individual LEDs of group 5 can be dimmed or switched off, preferably dimming or switching off those LEDs which generate light in the exterior of the light distribution and are not necessarily required for a high beam function. The same applies to the LEDs of Group 6.
- At least the three described light functions namely daytime running light, fog light and main beam, can be provided with very little space requirement and lower costs due to a lower wiring effort.
- the shape of the illumination areas 11, 12 corresponds, reversed in height, essentially to the shape of the emitter areas of the LED groups 5, 6.
- the imaging optics may change the shape and intensity distribution, etc. of the emitter surfaces.
- symmetric emitter surface may become one side Widened to improve a side lighting and / or to allow cornering light with a simple light emitter shape.
- certain surface portions of the footprint can be illuminated with higher intensity than others.
- FIG. 3 shows a further exemplary embodiment of a vehicle lighting device 13, in which the emitter surface of the first group 14 of four light-emitting diodes arranged in 2x2 matrix form is no longer arranged symmetrically with respect to the second group 6, but in contrast to the vehicle lighting device 1 of FIG Side further than to another side.
- a lighting area 15 extended to the right is thereby produced.
- Such a vehicle lighting device 13 can be used in particular to illuminate a right edge more particularly when installed on a right side of a vehicle. This can be used, in particular, to additionally use the vehicle lighting device 13 with a cornering light function.
- the four LED chips of the first LED group 14 would continue to be energized to the maximum.
- the second LED group 6 would radiate with comparatively low light intensity; in the first LED group 14, all LEDs or only the two right LEDs could then be activated fully or dim.
- To generate a cornering light for example, in straight-ahead operation, none or only the two right-hand LEDs can be activated, which illuminate a partial area further towards the roadway, while all or only the two left-hand LEDs of the first group 14 are connected for cornering, which extends a partial area further to the edge illuminate.
- the brightness of the cornering light is either fixed or variably adjustable. In a vehicle would usefully on the left side, z. B. in connection with a left vehicle headlight, a corresponding reversed vehicle lighting device to be installed, which illuminates the left edge stronger.
- the primary optics 17 are used here in particular for intensity and / or color homogenization of the light emitted by the LED groups 5, 6, as well as for a first shaping of the imaging area or illumination area.
- the primary optic 17 is here designed as a truncated pyramidal glass body with a rectangular base and top surface. Alternatively, z.
- a convex or concave lens a Fresnel lens used.
- the primary optics may also be opaque, completely or partially color-filtering or transparent, or partially impermeable to light, the base and top surfaces may be optimized with respect to the emitter surfaces (chip or group arrangement) and the light function and from a rectangular one Diverge geometry.
- the reflector may alternatively be in the form of a free-form reflector, for example. There may or may also be one or more - not shown - primary optics (s) may be present.
- FIG. 6A shows a possible interconnection of three sets A, B and C of light-emitting diodes whose geometrical arrangement is shown in FIG. 6B is shown.
- sets A and B may correspond to a first LED group and set C to a second LED group based on FIG. 1.
- While sets B and C are electrically connected in parallel, both are connected in series with respect to set A.
- the sets A, B and C are connected between an output of a driver 7 and a ground terminal GND.
- a toggle switch in the form of an electronic switch, in particular transistor 19 is inserted, so that a current path between the two parallel branches with respect to the LED sets B and C can be switched , In other words, a current flow can be switched between a current flow through the LED set A and the LED set B on the one hand and the LED set A and the LED set C on the other hand.
- each of the groups is substantially the same, so that when switching between the two LED sets B and C, the load remains substantially constant over the entire current path.
- a drive circuit with constant load control can be used, resulting in a further cost reduction. This can be achieved, for example, by using substantially identical LEDs in the same number with respect to the LED groups B and C.
- each set A, B, C can be provided with a separate driver, which is costly and expensive.
- this circuit can be switched for example with very little effort using a constant current source, in particular a simple voltage source, between a fog light and a high beam.
- the fog light is generated by the sets A and B, while the high beam is generated by the sets A ('halved' fog light footprint) and C. It is assumed that the LEDs have the same recording power. If the system is in fog light mode, the LED system is designed so that the four chips used can be maximally energized without overheating the system. If the high-light C set is activated, the cooling concept may overload (system or chip becomes too hot). Due to the shutdown of the set B but the heat can be kept constant, so that the LEDs are not too hot. When using a power source with variable power, a dimming can be performed here, in which all LEDs of a switching state are energized equal.
- FIG. 7 shows a possible independent switching of two LED sets on the basis of the LED groups 5, 6 from FIG. 2, which can be easily expanded to any number of LED groups.
- all the LED groups 5, 6 are connected in series between an output of a driver 7 and ground GND, a simple switch 20 being connected in parallel with each LED group 5, 6.
- a simple switch 20 being connected in parallel with each LED group 5, 6.
- the switch 20 When the switch 20 is open, current flows in the section associated with the LED group 5, 6 through the corresponding light-emitting diodes 7 and 8, while with the switch 20 closed the current is conducted via the switch 20 ("short-circuited").
- Such a circuit can be realized for example by means of a driver 7 with variable load.
- a resistor is present.
- the resistance value of such a resistor essentially corresponds to the load resistance of the associated LED group 5, 6, so that even with a closed switch 20 or a plurality of closed switches 20, a substantially constant load is present;
- a driver block with a constant load can be used, which is particularly inexpensive.
- an LED group may have only a single light-emitting diode or a plurality of light-emitting diodes of any desired number, ie, 2 or more light-emitting diodes.
- the arrangement of the light-emitting diodes does not have to be rectangular, ie, in matrix form.
- a white daytime running light it is also possible to generate a yellow daytime running light.
- a white light-emitting diode or white light-emitting diodes can be used, or it can be a cluster of different colored light-emitting diodes are used, which together, optionally by means of an optics designed to give a white mixed light.
- the use of an LED cluster has the advantage that the luminous color is variably adjustable.
- the vehicle lighting device shown can also be an LED module, optic (s), possibly a housing and / or an active or passive cooling element (eg a cooling body configured with cooling fins), wiring, electrical connections and so on as an LED system be designated.
- the vehicle lighting device or the LED system may be part of a lamp or represent a lamp.
- the vehicle lighting device or the lamp can be installed in a vehicle headlight, which in turn can be installed in a vehicle.
- the primary optic may also be made as a body of another transparent material.
- a Set of light emitting diode (s) B Set of light emitting diode (s) C Set of light emitting diode (s) GND Ground connection
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN200980119702.9A CN102046420B (zh) | 2008-05-28 | 2009-05-28 | 具有至少两个半导体发光元件的车辆照明装置 |
EP09753679.1A EP2300269B1 (de) | 2008-05-28 | 2009-05-28 | Fahrzeugbeleuchtungsvorrichtung mit mindestens zwei halbleiter-leuchtelementen |
JP2011510897A JP5611941B2 (ja) | 2008-05-28 | 2009-05-28 | 少なくとも2つの半導体発光部材を備える車両照明装置 |
US12/994,773 US8646956B2 (en) | 2008-05-28 | 2009-05-28 | Vehicle lighting device with at least two semiconductor light-emitting elements |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102008025397.9 | 2008-05-28 | ||
DE102008025397A DE102008025397A1 (de) | 2008-05-28 | 2008-05-28 | Fahrzeugbeleuchtungsvorrichtung mit mindestens zwei Halbleiter-Leuchtelementen |
Publications (1)
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WO2009144024A1 true WO2009144024A1 (de) | 2009-12-03 |
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PCT/EP2009/003827 WO2009144024A1 (de) | 2008-05-28 | 2009-05-28 | Fahrzeugbeleuchtungsvorrichtung mit mindestens zwei halbleiter-leuchtelementen |
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US (1) | US8646956B2 (de) |
EP (1) | EP2300269B1 (de) |
JP (1) | JP5611941B2 (de) |
KR (1) | KR20110013503A (de) |
CN (1) | CN102046420B (de) |
DE (1) | DE102008025397A1 (de) |
WO (1) | WO2009144024A1 (de) |
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Also Published As
Publication number | Publication date |
---|---|
JP5611941B2 (ja) | 2014-10-22 |
US20110080753A1 (en) | 2011-04-07 |
JP2011521435A (ja) | 2011-07-21 |
DE102008025397A1 (de) | 2009-12-24 |
CN102046420A (zh) | 2011-05-04 |
CN102046420B (zh) | 2014-09-17 |
KR20110013503A (ko) | 2011-02-09 |
US8646956B2 (en) | 2014-02-11 |
EP2300269B1 (de) | 2017-05-03 |
EP2300269A1 (de) | 2011-03-30 |
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