EP2725293A1 - Scheinwerfermodul - Google Patents

Scheinwerfermodul Download PDF

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Publication number
EP2725293A1
EP2725293A1 EP20130192971 EP13192971A EP2725293A1 EP 2725293 A1 EP2725293 A1 EP 2725293A1 EP 20130192971 EP20130192971 EP 20130192971 EP 13192971 A EP13192971 A EP 13192971A EP 2725293 A1 EP2725293 A1 EP 2725293A1
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EP
European Patent Office
Prior art keywords
phosphor
radiation source
module
headlight
radiation
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.)
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Application number
EP20130192971
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German (de)
English (en)
French (fr)
Inventor
Thomas Reiners
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Osram GmbH
Original Assignee
Osram GmbH
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Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2725293A1 publication Critical patent/EP2725293A1/de
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    • 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
    • F21S41/16—Laser light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/04—Controlling the distribution of the light emitted by adjustment of elements by movement of reflectors
    • 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
    • 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
    • F21S41/12—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
    • F21S41/13—Ultraviolet light; Infrared light
    • 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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled 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
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • 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
    • 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
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/70—Prevention of harmful light leakage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/06—Fastening incandescent mantles or other incandescent bodies to lamp parts; Suspension devices for incandescent mantles or other incandescent bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/43—Forced cooling using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings

Definitions

  • the present invention relates to a headlamp module according to the preamble of patent claim 1.
  • 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 headlights are currently producing alongside the statutory low beam and high beam additionally variable light distributions such as cornering light and cornering light based on the specifications of ECE regulation 123.
  • adaptive main beam will also be permitted.
  • parts of the high beam are hidden in order not to dazzle the preceding traffic or oncoming traffic.
  • 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.
  • matrix headlights based on discharge lamps, which contain an imaging element and in which each pixel is responsible for a specific solid angle element.
  • These headlights are known as Pixel or Matrix AFS (adaptive front lighting system) projectors.
  • Pixel or Matrix AFS adaptive front lighting system
  • 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.
  • Multi-LED floodlights only switch light where it is needed and can therefore be more efficient in principle.
  • the object of the present invention is therefore to provide a headlamp module, the one Dynamic light distribution for different driving situations at the lowest possible cost, high reliability and highest possible efficiency, without having to go along with the need for swiveling the headlamp module.
  • 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 carrier device for the at least one phosphor and at least one beam steering device, wherein the at least one beam steering device is arranged or configured such that it emits electromagnetic radiation emitted by the at least one radiation source onto the at least one phosphor or onto the phosphor mixture directs.
  • 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.
  • the electromagnetic radiation emitted by the radiation source is guided by means of the beam steering device over the entire or only over a part of the phosphor surface of the carrier device. It will be only the areas of the phosphor or phosphor mixture is excited to emit light over which the electromagnetic radiation has been conducted.
  • 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.
  • 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.
  • 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.
  • 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.
  • the beam steering device which may be realized for example as a micromirror device (MEMS, MOEMS, DMD)
  • MEMS micromirror device
  • MOEMS MOEMS
  • DMD digital light detector
  • 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.
  • 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.
  • 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 become.
  • highly functional headlights but also simple light distribution can be generated.
  • 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.
  • 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.
  • the at least one carrier device is transparent and applied to an optical filter device which is designed to at least partially reflect radiation emitted by the at least one phosphor.
  • the at least one beam steering device is 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.
  • 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.
  • 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.
  • 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.
  • the at least one support device is thermally connected to a cooling device, wherein the cooling device is a heat sink.
  • the cooling device is a heat sink.
  • the heat sink, the at least one support device represent. 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.
  • 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 areas, so that the light leaving the headlight module is composed of the light of a plurality of superimposed individual light distributions.
  • 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.
  • 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.
  • the control device can be designed such that the electromagnetic radiation emitted by the radiation source is guided by the at least one micromirror line by line or column by column over the phosphor surface of the carrier device.
  • 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 turned 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.
  • 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.
  • 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.
  • radiation of the excitation radiation source is longer available for the solid angle in which a light emission is desired.
  • 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, this results in 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.
  • 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.
  • 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.
  • 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 strikes 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 is preferably made 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.
  • a headlamp module 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 optimal excitation of the phosphor is ensured.
  • 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.
  • 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.
  • 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 )
  • a headlamp module 10 for example, three separate phosphors 20a, 20b, 20c are provided, each phosphor is associated with an optical device 24a, 24b, 24c and that of the optical Devices 24a, 24b, 24c emitted light is superimposed on an overall image 26.
  • 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.
  • 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.
  • 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.
  • 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 control of the beam steering devices 14a to 14c and the radiation source 12 in a fixed grid, for example to achieve a light distribution of the headlight 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. As a result, the radiation source 12 can remain longer in the dimming light solid angle in one scanning cycle. 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.
  • 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.
  • the phosphor surface is planar. This may 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 to form the surface of the phosphor 20, or the carrier device 18 for the phosphor 20, preferably as a sphere or generalized as a conic.
  • the optical device 24 may also be a freeform lens to intentionally distort the image. This allows, for example, an extension of the light distribution generate in peripheral areas, so as to keep the actual phosphor matrix, that is to be set by the controller 34 rows and columns on the phosphor 20, small, but still to allow expansion of the light distribution to larger areas.
  • 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-width ratios of the exit surface can be realized, whereby a great freedom of choice for the design of a headlamp module 10 equipped with a headlamp 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.
  • a headlamp module 10 in a vehicle headlamp requires white light, where "white” is determined by the ECE regulations and the CIE standard.
  • 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.
  • the phosphor 20 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 because it is at the maximum of V ( ⁇ ) 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, it is the phosphor 20 around yttrium aluminum garnet doped with cerium (YAG: Ce) or related garnets with doping at different 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 .
  • phosphors which emit red light such as nitrides
  • the white light contains the red component of law required by vehicle headlights of more than 5%.
  • a radiation source 12 for exciting the phosphor mixture 20 in this case a laser or a laser diode is used which emits ultraviolet radiation or blue light.
  • a UV radiation source can also be used as radiation source 12 instead of the laser emitting blue light be used.
  • 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.
  • 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.
  • the wavelength of the emitted light can be controlled very well, whereby the color control is much easier than today's white LEDs.
  • the color quality ie the color rendering index
  • RGB red, green and blue
  • 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 appropriate 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.
  • 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.
  • the radiation source 12 fails or malfunctions or operates at low power, it is intended to signal the driver that there is a fault, typically through a corresponding warning light on the dashboard. This will alert the driver to the limited functionality and visit of a workshop.
  • 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.
  • a safety device may be provided which shuts off the radiation source 12 in the case of an open headlight housing or in the event of an accident, especially when the headlight housing has burst.
  • the power of the excitation radiation source 12 is preferably between 5 and 20 W.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP20130192971 2010-05-12 2011-05-06 Scheinwerfermodul Withdrawn EP2725293A1 (de)

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