EP2851611A2 - Headlight module - Google Patents

Headlight module Download PDF

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Publication number
EP2851611A2
EP2851611A2 EP20140193460 EP14193460A EP2851611A2 EP 2851611 A2 EP2851611 A2 EP 2851611A2 EP 20140193460 EP20140193460 EP 20140193460 EP 14193460 A EP14193460 A EP 14193460A EP 2851611 A2 EP2851611 A2 EP 2851611A2
Authority
EP
European Patent Office
Prior art keywords
phosphor
14c
14a
radiation source
14b
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20140193460
Other languages
German (de)
French (fr)
Other versions
EP2851611B1 (en
EP2851611A3 (en
Inventor
Thomas Reiners
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Osram GmbH
Original Assignee
Osram GmbH
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Filing date
Publication date
Family has litigation
Priority to DE201010028949 priority Critical patent/DE102010028949A1/en
Application filed by Osram GmbH filed Critical Osram GmbH
Priority to EP20110719235 priority patent/EP2507545B1/en
Priority to PCT/EP2011/057314 priority patent/WO2011141377A1/en
Publication of EP2851611A2 publication Critical patent/EP2851611A2/en
Publication of EP2851611A3 publication Critical patent/EP2851611A3/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=44201932&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2851611(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application granted granted Critical
Publication of EP2851611B1 publication Critical patent/EP2851611B1/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

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    • 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
    • F21S41/16Laser light sources
    • 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
    • F21S41/12Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
    • F21S41/13Ultraviolet light; Infrared light
    • 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]
    • F21S41/147Light emitting diodes [LED] the main emission direction of the LED being angled 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
    • F21S41/20Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25Projection lenses
    • F21S41/255Lenses with a front view of circular or truncated circular outline
    • 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
    • F21S41/285Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
    • 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
    • F21S41/60Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • 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
    • F21S41/60Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • 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
    • F21S45/70Prevention of harmful light leakage
    • 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
    • F21S45/42Forced cooling
    • F21S45/43Forced cooling using gas
    • 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

Abstract

The present invention relates to a headlight module (10) with phosphors (20a, 20b, 20c) arranged separately from one another, which can be excited by means of electromagnetic radiation for emitting light, and at least one radiation source (12) for exciting the phosphors (20a, 20b, 20c). wherein each phosphor (20a, 20b, 20c) is associated with an optical device (24a, 24b, 24c) such that the light emitted by the optical devices (24a, 24b, 24c) is superimposed into an overall image (26), and wherein for the supply of the electromagnetic radiation beam splitter devices (30a, 30b) and beam steering devices (14a, 14b, 14c) and a control device (34) for controlling the at least one radiation source (12) and the beam steering devices (14a, 14b, 14c) are provided.

Description

    Technical area
  • The present invention relates to a headlamp module according to the preamble of patent claim 1.
  • State of the art
  • Such a headlight module is for example in the WO 2010/000610 A1 disclosed. This document describes a lighting unit for vehicle headlights, wherein the lighting unit has light-emitting diode chips as the light source, which are provided with a phosphor coating (chip layer coating) to convert the blue light generated by the light-emitting diode chips into white light. This lighting unit is designed as part of a vehicle headlight and can thus be regarded as a headlight module. The term headlamp module referred to in this patent application, a module which is intended for use in a headlight or formed as part of a headlamp. This module may, in the sense of the invention, be designed as a structural unit which is used as a whole in a headlight or as a system of individual interacting components of a headlight.
  • The headlight module according to the invention is also primarily intended for use in a vehicle headlight, although other applications are possible.
  • High-quality vehicle headlamps currently produce in addition to the statutory dipped and main beam additionally variable light distributions such as cornering and cornering lights based on the requirements of ECE Regulation 123. In the near future, adaptive high beam will be allowed. Here, parts of the high beam are hidden in order not to dazzle the preceding traffic or oncoming traffic. In addition, all current headlamp systems must be designed to be pivotable about a horizontal axis, transverse to the direction of travel in order to ensure the reach setting of the headlamp. In very powerful headlamps, this setting must even be made automatically depending on the load condition of the vehicle. Especially for the more recently used LED headlamps, this means that the entire system including a heavy cooling system has to be swiveled.
  • For this purpose, mechanical systems with stepper motors are usually used to pivot the headlight module about a horizontal axis. To realize a dynamic cornering light, it is also known to pivot the headlamp module about a vertical axis.
  • For the adaptive high beam and other variable light distributions, mechanical systems with hinged diaphragms or rollers are also used, by means of which the light of discharge lamps or even halogen lamps is intentionally hidden.
  • Also known are so-called matrix headlights on the basis of discharge lamps, which are an imaging Element and where each pixel is responsible for a given solid angle element. These headlamps are known as Pixel or Matrix AFS (adaptive front lighting system) projectors. On the one hand, they require a high luminance in order to keep the optical components small and, furthermore, a high luminous flux, which is subsequently - depending on the desired light distribution - largely faded out again, so that only a small part of the high luminous flux is actually used.
  • The advantages of such an intensity-modulated matrix headlamp are its high resolution and thus the possibility of getting along without actuators and moving components, while the disadvantage lies on the one hand in the high implementation costs, on the other hand in the low efficiency due to the type-related light destruction.
  • Multi-LED floodlights only switch light where it is needed and can therefore be more efficient in principle. However, due to the limited number of LEDs that can be switched at a reasonable cost, they do not provide enough resolution to fine tune the headlamp beam. Therefore you still need servomotors and moving parts.
  • In summary, it should be noted that all currently known systems are a compromise between efficiency, cost and use of mechanical systems and thus inevitably reliability.
  • Presentation of the invention
  • Therefore, the object of the present invention is to provide a headlamp module which enables dynamic light distribution for different driving situations at the lowest possible cost, high reliability and the highest possible efficiency, without having to go along with the necessity of pivoting the headlamp module.
  • This object is achieved by a headlamp module having the features of patent claim 1.
  • The headlight module according to the invention has at least one phosphor or a phosphor mixture which can be excited by means of electromagnetic radiation for emitting light and at least one radiation source for exciting the at least one phosphor or phosphor mixture. The headlight module additionally has at least one beam steering device, wherein the at least one beam steering device is arranged or designed in such a way that it directs electromagnetic radiation emitted by the at least one radiation source to the at least one phosphor or to the phosphor mixture. The at least one beam steering device opens up the possibility of exciting the phosphor or the phosphor mixture only at the positions which correspond to a dynamic light distribution currently to be set in the field of vision of the driver, for example on the road. In this case, similar to a scanning method of a scanner, the electromagnetic radiation emitted by the radiation source by means of the beam steering device on the all or only over part of the phosphor provided surface of the carrier device. Thus, only the areas of the phosphor or phosphor mixture for light emission are excited, over which the electromagnetic radiation was guided. The beam guidance takes place sufficiently fast, so that the human eye can not follow it. In this way, a light distribution is generated on the phosphor surface of the carrier device, which is projected by means of projection optics, for example, on the lane to be illuminated.
  • The at least one radiation source is preferably a laser, for example a laser diode or an arrangement of a plurality of laser diodes or one or more light-emitting diodes, in particular super-light-emitting diodes. By means of these radiation sources can be generated in a highly efficient manner electromagnetic radiation from the spectral range of visible light and the ultraviolet and infrared range and generated to excite the phosphor or phosphor mixture. Preferably, an ultraviolet radiation or blue light emitting light emitting diode array and particularly preferably laser diode array is used as the radiation source, and by means of the phosphor or the phosphor mixture thereof generates white light to enable, for example, a white light emitting vehicle headlights.
  • A number of advantages can be achieved on the basis of the present invention:
    • By virtue of the fact that the radiation in the excitation radiation source can be modulated, the phosphor is excited via the above-indicated scanning method only where it is needed. This results in a high efficiency. An efficiency deterioration, as known from the prior art, by a downstream modulation and suppression of radiation is not necessary. This contributes to the reduction of gasoline consumption and CO 2 emissions of the vehicle.
  • By the present invention, a high resolution can be achieved. By the beam steering device, which may be realized for example as a micromirror device (MEMS, MOEMS, DMD), a resolution in the range of 1000 x 1000 pixels can be generated and thus realize the legally required adjustment of the light distribution without stepper motors. Furthermore, via a dynamic change of the light distribution curve light, adaptive high beam and other variable light distributions can be generated in accordance with ECE Regulation 123, without mechanically moving the entire headlight module. The movement of the micromirrors is easy to realize due to their low mass.
  • By means of the present invention, any aspect ratio can be adjusted. The phosphor swept area of the phosphor and the phosphor itself may be produced at low cost in any length-to-width ratio (in one piece or in pieces). This allows the special properties of a beam distribution of a headlamp be taken into account.
  • Another advantage of the present invention is its high flexibility. The desired light distribution can be programmed by software in any form. Thus, with the same headlight module highly functional headlights, but also simple light distribution can be generated. If a laser is used as the excitation radiation source, a light source for a frugal electric car can be generated by using a smaller laser class, ie with lower power consumption, while very expensive and design-driven headlights are possible with higher laser powers or multiple exit surfaces realized by lenses and reflectors are.
  • In a preferred embodiment, the headlight module further comprises at least one at least partially transparent optical device, which is arranged in the beam path of the radiation emitted by the at least one phosphor or phosphor mixture. This may preferably be an aspherical lens and / or a free-form lens. This makes it possible to realize an enlargement or a projection of the intermediate image on the phosphor to infinity - for automobile headlights, this is typically the case from a distance of more than 25 m. Free-form lenses can be used to achieve a desired distortion, for example to produce an extension of the light distribution into peripheral areas. As a result, the phosphor surface can be kept small and still achieve an extension of the light distribution to larger areas.
  • In a preferred embodiment, the at least one carrier device is transparent and on an optical filter device which is designed to at least partially reflect radiation emitted by the at least one phosphor. In this case, the at least one beam steering device is preferably arranged such that radiation emitted by the at least one excitation radiation source passes through the optical filter device and the carrier device before it impinges on the phosphor. By this embodiment, radiation emitted by the excitation radiation source strikes the phosphor at a small angle, causing only extremely small distortions. The measures for distortion corrections are therefore very small. The space between the phosphor and the possibly provided, at least partially transparent optical device can be kept free of other elements.
  • In an alternative realization, at least one carrier device is designed to be reflective for radiation emitted by the at least one phosphor and / or for radiation emitted by the at least one excitation radiation source. In this case, the at least one beam steering device is preferably arranged such that radiation emitted by the at least one excitation radiation source impinges on the side of the phosphor remote from the carrier device of the phosphor. Such a variant results in a particularly low overall depth. Moreover, it can be implemented extremely cost-effectively, since no transparent carrier device and no optical filter device is needed.
  • Preferably, the at least one support device is thermally connected to a cooling device, wherein the cooling device is a heat sink. Alternatively, the heat sink may constitute the at least one carrier device. If the heat sink is designed to be reflective, for example by a coating with aluminum, aluminum oxide or titanium oxide, then the phosphor can be applied particularly cost-effectively directly to the heat sink.
  • The surface of the carrier device provided with the at least one phosphor or luminous mixture may be planar or curved at least in some areas. By means of these measures, a higher image sharpness can be achieved, since an optionally provided curvature of the surface of the at least one phosphor can be achieved so that almost all regions of the phosphor are at the focal point of the optionally provided at least partially transparent optical device. This can be achieved by appropriate design of the surface of the phosphor or by the formation of the carrier device.
  • The headlight module preferably comprises at least one beam splitter device, which is arranged between the at least one excitation radiation source and the at least one beam steering device. This opens up the possibility of illuminating a plurality of phosphor regions, which may be spatially separated from one another, by means of a beam steering device in each case in an optimized manner. In this case, a separate optical device can be provided for each of the phosphor regions, so that the light leaving the headlight module emerges from the light composed of several superimposed individual light distributions.
  • In a further embodiment, a plurality of phosphor regions with different phosphors are present, wherein the phosphors are selected such that they produce different secondary colors. Preferably, the latter are chosen so that they give white in a subsequent superposition. Such a combination of phosphors may preferably be based on red-green-blue (RGB) color coordinates; however, other color systems known to those skilled in the art are also possible.
  • The at least one beam steering device may comprise a micromirror device. Preferably, the micromirror device comprises at least one micromirror pivotable about two axes.
  • The headlight module preferably further comprises a control device for the at least one excitation radiation source or or and for the at least one beam steering device.
  • The control device is preferably designed to actuate at least one micromirror of the micromirror arrangement such that it assumes predeterminable spatial positions and orientations, wherein the control device is further designed to switch on or off the radiation source depending on the position or orientation of the at least one micromirror. In particular, the control device may be designed such that the electromagnetic radiation emitted by the radiation source by means of the at least one micromirror line by line or in columns over the with Fluorescent surface of the carrier device is guided.
  • In this case, the electromagnetic radiation emitted by the radiation source can be guided by means of the at least one micromirror over the entire phosphor surface of the carrier device and the radiation source switched off or switched on reaching certain positions or positions of the micromirror, to excite only a portion of the phosphor provided area and to produce a desired light distribution.
  • Alternatively, the electromagnetic radiation emitted by the radiation source can also be guided by means of the at least one micromirror only over part of the phosphor surface of the carrier device, in which case the radiation source remains permanently switched on in order to excite also only a section of the area provided with phosphor and to produce a desired light distribution.
  • In the first case, the modulation capability of the excitation radiation source is exploited, whereby a high efficiency can be achieved because light does not need to be unnecessarily destroyed or faded out. In the second case, radiation of the excitation radiation source is longer available for the solid angle in which a light emission is desired. As a result, the excitation radiation source can be dimensioned smaller, which is also reflected in an increase in efficiency and in a reduction of the implementation costs. In addition, will thereby achieving a more homogeneous use of the excitation radiation source.
  • The optical device may comprise at least one reflection device which is arranged such that at least one of the at least one phosphor emitted radiation impinges on the at least one reflection device. This makes it possible to realize a deliberate distortion to achieve a desired light distribution in a simple manner. In addition, magnification effects can be achieved. Reflection devices have the advantage that the orientation of the phosphor in the direction of travel of the motor vehicle can be up, down or sideways, which allows a greater degree of freedom in the realization of a headlight module according to the invention. Moreover, different length-width ratios of the exit surface can be realized, whereby the design of a headlamp with a headlamp module according to the invention can be easily adapted to specifications of end customers.
  • Further advantageous embodiments will become apparent from the dependent claims.
  • Brief description of the drawings
  • Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Show it:
  • Fig. 1
    a schematic representation of a first embodiment of a headlight module according to the invention;
    Fig. 2
    a schematic representation of a second embodiment of a headlight module according to the invention;
    Fig. 3
    a schematic representation of a third embodiment of a headlight module according to the invention;
    Fig. 4
    a more detailed illustration of an embodiment of the present invention with a curved phosphor carrier and an optical device;
    Fig. 5
    a more detailed representation of an embodiment of the present invention with a planar phosphor carrier and a reflection device; and
    Fig. 6
    a CIE standard color chart for determining the excitation radiation sources and phosphors to be used in a headlight module according to the invention.
    Preferred embodiment of the invention
  • In the different figures, the same reference numerals are used for identical and equivalent components. These are therefore introduced only once.
  • Fig. 1 shows a schematic representation of a first embodiment of a headlamp module 10 according to the invention. This comprises at least one radiation source 12, which is preferably designed as a blue light emitting laser, in particular as a blue light emitting laser diode. Radiation of the excitation radiation source 12 applies to a beam steering device 14, which is preferably designed as a micromirror device. The radiation emitted by the beam steering device 14 first passes through an optical filter device 16, then a carrier device 18 for the at least one phosphor and finally the at least one phosphor 20. The carrier device 18 preferably consists of highly thermally conductive material. The optical filter device 16 is designed such that it allows radiation of the radiation source 12 to pass while it reflects radiation emitted by the phosphor 20. The beam steering device 14 is designed to deflect the radiation emitted by the radiation source 12 in such a way that time-sequentially different regions of the phosphor 20 are excited. The support device 18 is preferably made of ceramic, for example polycrystalline alumina ceramic (PCA) or sapphire.
  • The phosphor 20 may be composed of a plurality of different phosphor components which convert the electromagnetic radiation of the radiation source 12 into light of different wavelength or color. Furthermore, the phosphor 20 may also be a phosphor mixture. Since about 20% of the energy in the phosphor 20 is lost by the Stokes shift and is converted into heat, the phosphor 20 is cooled by means of a cooling device 22. This can be for example a blower. An optical device 24, for example a projection lens with a focal length of 20 mm to 100 mm, allows the luminance distribution to be imaged without distortion into the far field.
  • In the Fig. 1 illustrated embodiment of a headlamp module according to the invention is characterized in that the radiation of the radiation source 12 hits the phosphor 20 at a small angle of incidence, whereby the spot size, that is, the beam diameter of the incident on the phosphor 20 beam, kept small and ensures optimal excitation of the phosphor becomes. Typical spot sizes are 0.1 mm to 0.2 mm to ensure the necessary resolution for producing different light distributions. The phosphor 20 and the radiation source 12 are matched to one another such that the light emitted by the headlight module 10 is white with a color temperature in the range of 3000-6500 Kelvin.
  • In the Fig. 2 schematically illustrated embodiment of a headlamp module 10 according to the invention is characterized by a significantly smaller depth than that in Fig. 1 illustrated embodiment. In this case, the combination of radiation source 12 and beam steering device 14 is mounted such that it impinges on a side of the phosphor 20 facing away from the carrier device 18. The carrier device 18 is designed to reflect radiation emitted by the at least one phosphor 20 or radiation emitted by the at least one excitation radiation source 12. The support device 18 may also be designed as a heat sink itself. This distinguishes the in Fig. 2 illustrated embodiment by extremely low production costs. Also marked is the cut-off line HDG. (also in Fig. 1 )
  • At the in Fig. 3 Illustrated embodiment of a headlight module 10 according to the invention, for example, three separate phosphors 20a, 20b, 20c are provided, each phosphor is associated with an optical device 24a, 24b, 24c and the light emitted from the optical devices 24a, 24b, 24c superimposed on an overall image 26 becomes. By way of example, it is shown that the radiation source 12 can be followed by an optical device 28, for example a lens. The radiation leaving the lens 28 is fed by means of two beam splitter devices 30a, 30b three beam steering devices 14a, 14b and 14c.
  • In FIG. 3 For the sake of simplicity, it is shown that the phosphors 20a, 20b, 20c are operated only by the beam steering device or the micromirror 14a. But it is also possible that the phosphors 20a, 20b, 20c are each operated by a beam steering device or a micromirror 14a, 14b, 14c.
  • As clearly seen, the surface provided with the phosphor 20b is curved, while the phosphors 20a, 20c are arranged on planar surfaces. A cooling device 32 is used to cool the radiation source 12. Furthermore, a control device 34 is shown, which serves to control the at least one radiation source 12 and the beam steering devices 14a to 14c. The beam steering devices 14a to 14c can be designed, in particular, as micromirrors pivotable about two axes. The control device 34 enables a control of the beam steering devices 14a to 14c and the radiation source 12 in a fixed grid, for example, a light distribution of To achieve headlamps in solid angle ranges of horizontal plus / minus 50 ° and vertical minus 15 ° / plus 10 °. It also makes it possible to turn off the radiation source 12 when passing over the angle ranges, in which no light is currently needed, in the short term.
  • Such a drive is easy to realize because the horizontal / vertical deflection unit of such a control device 34, which serves for horizontal and vertical deflection of the micromirror, thereby to lead the originating from the radiation source 12 light beam line by line or in columns over the phosphor 20, always operates at the same frequencies and the resonance frequency of the beam steering device 14 can be adjusted in a simple manner. Since the typical light distribution but only fills a smaller solid angle, with such an arrangement "duty cycle" is given away. That is, the radiation source 12 is turned off at many positions of the micromirror or the beam steering device 14 and the phosphor 20 must be highly charged during the duty cycle of the radiation source 12 to generate the necessary amount of light.
  • An improved control therefore adapts the angular ranges for the horizontal and vertical deflection of the micromirror or the beam steering device 14 to the currently desired light distribution. For example, at low beam, only a few lines above the cut-off line HDG are required for the asymmetry of the beam. Here, therefore, a correspondingly smaller angular range is sufficient for the line-by-line guidance of the micromirror or the beam steering device. This allows the Radiation source 12 remain longer in a scanning cycle in the low beam solid angle. For cornering light less columns are needed, that is, the radiation source 12 is longer available for the core light distribution. Here, therefore, a correspondingly smaller angular range is sufficient for the column-wise guidance of the micromirror or the beam steering device 14.
  • For the last-mentioned embodiment of the drive, the beam steering device 14a, 14b, 14c must be operated with different frequencies for rows and columns and therefore requires dynamic tuning of the resonant circuit. Although this results in an increased technical complexity, but the time has a more homogeneous use of the excitation radiation source 12 result.
  • Fig. 4 shows in greater detail a combination of phosphor 20 and optical device 24 of a headlight module 10 according to the invention. Here, by way of example, the phosphor surface is planar. This can be achieved by appropriate formation of the phosphor surface itself or by appropriate formation of the support device 18. The optical device 24 may be an aspherical lens to achieve magnification and thereby project the intermediate image on the phosphor 20 to infinity. This is the case with automobile headlights from a distance of more than 25 m. The focal plane of such aspherical lenses, ie the plane from which is sharply imaged, is not plan, but typically a curved surface. Therefore, it is particularly preferred, the surface of the phosphor 20, or the carrier device 18 for the phosphor 20, preferably as a sphere or generalized to form a conic.
  • The optical device 24 may also be a freeform lens to intentionally distort the image. In this way, for example, an extension of the light distribution into peripheral areas can be generated in order to keep the actual phosphor matrix, that is to say the rows and columns on the phosphor 20 to be adjusted by the control device 34 small, but nevertheless an extension of the light distribution over larger areas to enable.
  • Fig. 5 shows a schematic representation of an embodiment in which the optical device 24 is formed as a reflection device. The reflection device may be formed parabolic and then fulfills a similar purpose as an aspherical lens, that is, rays emanating from a point are imaged to infinity, so made parallel. Since the phosphor 20 radiates only in a half-space, a maximum of a quarter-reflector shell is needed.
  • Free-form reflectors can in turn deliberately distort the light distribution, that is, one can work in the different areas of the reflection device with different magnification and distortion factors.
  • Reflection devices additionally have the advantage that the phosphor 20 can be mounted in the direction of travel at the top, bottom or side, whereby a greater degree of freedom can be achieved in the design of a system equipped with a headlight module 10 according to the invention. At the same time, different length-to-width ratios can be used the exit surface can be realized, whereby a great freedom of choice for the design of a equipped with a headlamp module 10 headlamp invention can be achieved.
  • Fig. 6 shows a CIE standard color chart in which combinations of excitation radiation sources 12 and phosphors 20, as they can be used for a headlamp module according to the invention, are shown by way of example. Curve 36 represents the spectral color train. Curve 38 encloses a field which according to the ECE regulations is considered white. The white point 40 is also marked. The curve 42 shows the Planck curve.
  • An application of a headlamp module 10 according to the invention in a vehicle headlamp requires white light, where "white" is determined by the ECE regulations and the CIE standard. Preferably, the color locus is placed near the white point 40 (about 5500 K or even up to 6500 K) to produce day-like light colors. Depending on the pump wavelength of the laser used as the radiation source 12, which may be between 400 and 480 nm, the phosphor 20 must therefore have its center of gravity between 570 and 590 nm. In this case, 590 nm produces rather warm white light and 570 nm with a pump wavelength around the 410 nm cold white light. Some combinations are as examples in Fig. 6 located. The connecting line passes through the white field 38 and the color locus can be adjusted there.
  • The most efficient solution is a 570 nm phosphor, which is at the maximum of V (A) and can be achieved with a pump wavelength of 405 nm.
  • Phosphors 20 are used as they are already used today for light emitting diodes for generating white light. For example, phosphor 20 is yttrium aluminum garnet doped with cerium (YAG: Ce) or related garnets with doping at various concentrations. Various embodiments of such phosphors 20, the EP 1 471 775 be removed. Other typical phosphors are calsines, SCAP type phosphors, nitridosilicates and chlorosilicates, oxynitrides and silicates, especially orthosilicates, which are already known per se and used for blending to produce white light. Typical examples of this are in the published patent applications DE 10 2006 036577 . DE 201 15 914 U1 . US 2003/146690 . WO 2001/040403 . WO 2004/030109 . DE 10 2007 060 199 . DE 103 19 091 and DE 10 2005 017 510 disclosed. By means of these phosphors, the light colors can be adjusted to warm white, cool white and daylight-like white, and in particular can be produced with these phosphors and white light with a desired color temperature in the range of 3000 Kelvin to 6500 Kelvin. Examples of this can be found in the DE 10 2004 038 199 , of the WO 00/33389 and the EP 1 878 063 ,
  • By using phosphors which emit red light, such as nitrides, in the phosphor mixture 20, it is also ensured that the white light contains the red component of law required by vehicle headlights of more than 5%. As radiation source 12 For excitation of the phosphor mixture 20, a laser or a laser diode is used which emits ultraviolet radiation or blue light.
  • In principle, therefore, in the case of a headlight module 10 according to the invention, a UV radiation source can also be used as radiation source 12 instead of the laser emitting blue light. In this case, at least two different phosphors are required for the production of white light whose color loci are diametrically opposite the white point 40. This results in an increased color quality, since the spectrum of the light can be controlled independently of the pump wavelength of the excitation radiation source 12.
  • In a headlight module 10 according to the invention, the light emitted by the headlight module 10 is preferably composed of two color components, in particular of the radiation of the radiation source 12 and of the radiation emitted by one or more phosphors. As a result, the wavelength of the emitted light can be controlled very well, whereby the color control is much easier than today's white LEDs.
  • With a 3-color system, for example red, green and blue (RGB), the color quality, ie the color rendering index, can be significantly improved and one can represent the entire color space spanned by the phosphors by different modulation of the different colors.
  • Legal requirements require the possibility of range adjustment for the approval of headlamps in a motor vehicle. This is the light-dark border HDG of the headlight in the prior art tilted specifically against the horizon by 1% corresponding to 0.57 ° down, which in the headlight according to the prior art electric actuators, some even very complex stepper motors, are needed. In a headlamp module 10 according to the invention, these servomotors can be omitted since the HDG can be accurately controlled in the range of 0.1 °. This can be achieved by a correspondingly fine adjustment of the line signal for the beam steering device. Since the latter is an analog signal, however, in terms of the resolution of the HDG in a headlamp module 10 according to the invention, in principle, there are no limits. By appropriate control of the control device 34, for example by connection to a bus system of the motor vehicle, which is coupled with inclination sensors of the motor vehicle, or by a manual input in the control panel of the driver, can be achieved by a corresponding control of the beam steering device 14 in a headlamp module 10 according to the invention an effect which corresponds to a tilt.
  • The control device 34 is also designed to set the range setting to a predetermined value if the communication with the motor vehicle fails. At the same time, the control of the beam steering device 14 is preferably simultaneously converted to normal dipped beam by a permanently stored light distribution in order to protect the phosphor 20.
  • In addition, if the radiation source 12 fails or operates incorrectly or with low power, it is intended to signal to the driver that a defect is present, typically by a corresponding warning light on the dashboard. This will alert the driver to the limited functionality and visit of a workshop.
  • If the beam steering device 14 fails, a warning signal is also generated to the driver and the radiation source 12 is turned off. Finally, it is provided to deactivate the radiation source 12 if the vehicle is to be serviced in a workshop and the headlight module 10 has to be opened. As a result, the maintenance personnel is reliably protected. Likewise, a safety device can be provided which shuts off the radiation source 12 in the case of an open headlight housing or in the event of an accident, in particular in the case of a broken headlight housing.
  • The power of the excitation radiation source 12 is preferably between 5 and 20 W.

Claims (9)

  1. Headlamp module (10) with luminescent materials (20a, 20b, 20c) arranged separately from one another, which can be excited by means of electromagnetic radiation for emitting light, and at least one radiation source (12) for exciting the luminescent substances (20a, 20b, 20c), each luminescent substance (20a , 20b, 20c) is associated with an optical device (24a, 24b, 24c), so that the light emitted by the optical devices (24a, 24b, 24c) is superimposed to an overall image (26), and wherein for the purpose of supplying the electromagnetic radiation Beam splitter devices (30a, 30b) and beam steering devices (14a, 14b, 14c) and a control device (34) for controlling the at least one radiation source (12) and the beam steering devices (14a, 14b, 14c) are provided.
  2. Headlamp module according to claim 1, wherein the beam steering devices (14a, 14b, 14c) are formed as a micromirror pivotable about two axes.
  3. A headlamp module according to claim 2, wherein the control device (34) comprises a horizontal / vertical deflection unit for horizontal and vertical deflection of the micromirrors (14a, 14b, 14c).
  4. Headlamp module according to claim 3, wherein the driving device (34) are formed such that the angular ranges for the horizontal and vertical deflection of the micromirrors (14a, 14b, 14c) are adapted to the desired light distribution.
  5. A headlamp module according to claim 3 or 4, wherein the driving device (34) is designed such that the driving of the micromirrors (14a, 14b, 14c) are operated at different frequencies for rows and columns.
  6. A headlamp module according to any one of claims 1 to 5, wherein the control device (34) is adapted to enable the beam steering devices (14a, 14b, 14c) to be controlled in a fixed grid to provide light distribution of the headlamp in solid angle ranges of horizontal plus / minus 50 ° and vertical minus 15 ° / plus 10 ° to reach.
  7. Headlamp module according to one of claims 1 to 6, wherein the control device (34) is adapted to turn off the at least one radiation source (12) when sweeping over solid angle ranges, in which no light is currently required, in the short term.
  8. A headlight module according to claim 1, wherein at least one phosphor (20b) is disposed on a curved surface.
  9. Headlamp module according to one of claims 1 to 8, wherein the phosphors (20a, 20b, 20c) each by a beam steering device (14a, 14b, 14c) are operated.
EP14193460.4A 2010-05-12 2011-05-06 Headlight module Active EP2851611B1 (en)

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PCT/EP2011/057314 WO2011141377A1 (en) 2010-05-12 2011-05-06 Headlight module

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