EP2507545B2 - Module d'un phare de véhicule - Google Patents
Module d'un phare de véhicule Download PDFInfo
- Publication number
- EP2507545B2 EP2507545B2 EP11719235.1A EP11719235A EP2507545B2 EP 2507545 B2 EP2507545 B2 EP 2507545B2 EP 11719235 A EP11719235 A EP 11719235A EP 2507545 B2 EP2507545 B2 EP 2507545B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- phosphor
- headlight module
- radiation source
- headlight
- light
- 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.)
- Not-in-force
Links
- 230000005855 radiation Effects 0.000 claims description 72
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 69
- 230000003287 optical effect Effects 0.000 claims description 21
- 230000005670 electromagnetic radiation Effects 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 description 25
- 230000005284 excitation Effects 0.000 description 16
- 239000000463 material Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 238000013461 design Methods 0.000 description 7
- 239000003086 colorant Substances 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- GTDCAOYDHVNFCP-UHFFFAOYSA-N chloro(trihydroxy)silane Chemical class O[Si](O)(O)Cl GTDCAOYDHVNFCP-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052605 nesosilicate Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 150000004762 orthosilicates Chemical class 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910019655 synthetic inorganic crystalline material Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 description 1
Images
Classifications
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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
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- 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
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- 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
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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
- 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 headlight module according to the preamble of 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, the lighting unit having light-emitting diode chips as a light source, which are provided with a fluorescent coating (chip layer coating) in order to convert the blue light generated by the light-emitting diode chips into white light.
- This lighting unit is designed as a component of a vehicle headlight and can therefore be viewed as a headlight module.
- the term headlight module refers to a module that is intended for use in a headlight or is designed as a component part of a headlight. In the sense of the invention, this module can 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 EP 2 063 170 A2 discloses a lighting device for a vehicle with an optical imaging element arranged in the beam path of a light source, wherein a surface element is arranged between the light source and the imaging element and is designed to illuminate the focal plane of the imaging element.
- the DE 101 61 177 A1 discloses a lighting unit for vehicles with a light source which is formed by an electron beam device in which an electron beam source for generating an electron beam and a conversion surface for converting the electron beam into a light beam are arranged.
- the headlight module according to the invention is also primarily intended for use in a vehicle headlight, although other areas of use are also possible. Additional variable light distributions such as cornering lights and cornering lights based on the specifications of ECE regulation 123. In the near future, adaptive high beam will also be allowed. Parts of the high beam are masked out so as not to dazzle the traffic ahead or oncoming traffic. In addition, all current headlight systems must be designed to be pivotable about a horizontal axis, transverse to the direction of travel, in order to be able to ensure the range adjustment of the headlight. In very powerful headlights, this setting even has to be made automatically depending on the vehicle's load condition. In particular with the recently used LED headlights, 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) headlights.
- pixel or matrix AFS adaptive front lighting system
- they need a high luminance to keep the optical components small, and on the other hand a high luminous flux, which - depending on the desired light distribution - is then largely faded out again so that only a small part of the high luminous flux is actually used.
- Multi-LED headlights 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 headlight module that enables dynamic light distribution for different driving situations at the lowest possible cost, high reliability and the highest possible efficiency, without the need to pivot the headlight module.
- the headlight module according to the invention has at least one phosphor or a phosphor mixture which can be excited to emit light by means of electromagnetic radiation 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, the at least one beam steering device being arranged or designed in such a way that it emits electromagnetic radiation from 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 that correspond to a dynamic light distribution currently to be set in the driver's field of vision, for example on the roadway.
- the electromagnetic radiation emitted by the radiation source is guided by means of the beam steering device over all or only part of the surface of the carrier device provided with luminescent substance.
- the beam steering device covers all or only part of the surface of the carrier device provided with luminescent substance.
- the at least one radiation source is preferably a laser, for example a laser diode or an arrangement of several 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 several laser diodes or one or more light-emitting diodes, in particular super-light-emitting diodes.
- electromagnetic radiation from the spectral range of visible light and the ultraviolet and infrared range can be generated in a highly efficient manner and generated to excite the phosphor or phosphor mixture.
- An ultraviolet radiation or blue light emitting light-emitting diode arrangement and particularly preferably a laser diode arrangement is preferably used as the radiation source, and white light is generated therefrom by means of the luminescent material or the phosphor mixture, for example to enable a vehicle headlamp that emits white light.
- the present invention can achieve high resolution.
- the beam steering device which can be implemented as a micromirror device (MEMS, MOEMS, DMD), for example, enables a resolution in the range of 1000 x 1000 pixels to be generated and thus the legally required setting of the light distribution without stepper motors. Furthermore, by dynamically changing the light distribution, cornering light, adaptive high beam and other variable light distributions according to ECE regulation 123 can be generated without moving the entire headlight module mechanically. The movement of the micromirrors is easy to implement due to their low mass.
- MEMS micromirror device
- any aspect ratio can be set by means of the present invention.
- the surface of the luminescent material swept by the beam deflection device and the luminescent material itself can be produced in any length-to-width ratio (in one piece or in pieces) at low cost. This allows the special properties of a beam distribution of a headlight to be taken into account.
- the desired light distribution can be programmed in any form using software. This means that the same headlight module can be used to produce highly functional headlights, but also simple light distributions. 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, i.e. with lower power consumption, while very complex and design-driven headlights are possible with higher laser powers or several exit surfaces, realized by lenses and reflectors are.
- 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 preferably arranged in such a way that radiation emitted by the at least one excitation radiation source passes through the optical filter device and the carrier device before it strikes the phosphor.
- radiation emitted by the excitation radiation source hits the phosphor at a small angle, as a result of which only extremely small distortions arise.
- the measures for distortion corrections are therefore very low.
- the space between the phosphor and the at least partially transparent optical device that may be provided can be kept free of further elements.
- the headlight module furthermore 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 can preferably be an aspherical lens and / or a free-form lens. This allows the intermediate image to be enlarged or projected to infinity on the phosphor - this is typically the case for automobile headlights from a distance greater than 25 m.
- a desired distortion can be achieved by means of freeform lenses, for example in order to produce a stretching of the light distribution in peripheral areas. As a result, the fluorescent surface can be kept small and the light distribution can still be expanded to larger areas
- the at least one carrier device is preferably thermally connected to a cooling device, the cooling device representing a heat sink.
- the heat sink can represent the at least one carrier device. If the heat sink is designed to be reflective, for example by coating with aluminum, aluminum oxide or titanium oxide, the phosphor can be applied directly to the heat sink in a particularly cost-effective manner.
- the surface of the carrier device provided with the at least one luminescent substance or luminescent mixture can be planar or curved, at least in regions. Through these measures, a higher image sharpness can be achieved, since an optional curvature of the surface of the at least one phosphor can ensure that almost all areas of the phosphor lie in the focal point of the at least partially transparent optical device that may be provided. This can be achieved by appropriately designing the surface of the phosphor or by designing 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 optimally illuminating a plurality of phosphor areas, which can be arranged spatially separated from one another, by means of a respective beam steering device. A separate optical device can be provided for each of the fluorescent areas, so that the light that leaves the headlight module is composed of the light of several superimposed individual light distributions.
- phosphor areas with different phosphors are present, the phosphors being selected such that they produce different secondary colors.
- the latter are preferably chosen such that they result in white when they are subsequently superimposed.
- Such a combination of phosphors can preferably be based on red-green-blue (RGB) color coordinates; however, other color systems known in the art are also possible.
- RGB red-green-blue
- the at least one beam steering device comprises a micromirror device.
- the micromirror device preferably comprises at least one micromirror which can be pivoted about two axes.
- the headlight module furthermore comprises a control device for the at least one excitation radiation source and for the at least one beam steering device.
- the control device is designed to control at least one micromirror of the micromirror arrangement in such a way that it assumes predeterminable spatial positions and orientations, the control device also being designed to switch the radiation source on or off 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 means of the at least one micromirror line by line or column by column over the surface of the carrier device provided with luminescent material.
- the electromagnetic radiation emitted by the radiation source can be guided by means of the at least one micromirror over the entire surface of the support device provided with luminescent material and the radiation source can be switched off or switched on when certain positions or positions of the microscopic mirror are reached in order to excite only a section of the area provided with luminescent material and thus to generate the desired light distribution.
- the electromagnetic radiation emitted by the radiation source can be guided by means of the at least one micromirror only over part of the surface of the carrier device provided with luminescent material, in which case the radiation source remains switched on constantly in order to also excite only a section of the area provided with luminescent material and to generate a desired light distribution.
- the modulation capability of the excitation radiation source is used, whereby a high level of efficiency can be achieved, since light does not have to be unnecessarily destroyed or masked out.
- radiation from the excitation radiation source is available longer for the solid angle in which light emission is desired.
- the excitation radiation source can be dimensioned weaker, which is also reflected in an increase in efficiency and in a reduction in implementation costs.
- a more homogeneous use of the excitation radiation source is thereby achieved.
- the optical device can comprise at least one reflection device which is arranged in such a way that at least radiation emitted by the at least one phosphor strikes the at least one reflection device.
- Reflection devices offer the advantage that the orientation of the fluorescent material in the direction of travel of the motor vehicle can take place above, below or to the side, which enables a greater degree of freedom in the implementation of a headlight module according to the invention.
- different length-to-width ratios of the exit surface can be implemented, as a result of which the design of a headlight with a headlight module according to the invention can be adapted in a simple manner to the specifications of end customers.
- Fig. 1 shows a schematic representation of a first embodiment of a headlight 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 from the excitation radiation source 12 hits 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 in such a way that it allows radiation from 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 regions of the phosphor 20 that differ in time are excited.
- the carrier device 18 is preferably made of ceramic, for example of polycrystalline aluminum oxide ceramic (PCA) or of sapphire.
- the phosphor 20 can be composed of several different phosphor components which convert the electromagnetic radiation from the radiation source 12 into light of different wavelengths or colors. Furthermore, the phosphor 20 can also be a phosphor mixture. Since around 20% of the energy in the phosphor 20 is lost through the Stokes shift and is converted into heat, the phosphor 20 is cooled by means of a cooling device 22. This can be a fan, for example.
- the illustrated embodiment of a headlight module according to the invention is characterized in that the radiation from the radiation source 12 hits the phosphor 20 at a small angle of incidence, whereby the spot size, i.e. the beam diameter of the beam striking the phosphor 20, is kept small and ensures optimal excitation of the phosphor becomes.
- Typical spot sizes are 0.1 mm to 0.2 mm in order to ensure the necessary resolution for the generation of different light distributions.
- the luminescent material 20 and the radiation source 12 are matched to one another in such a way that the light emitted by the headlight module 10 is white with a color temperature in the range of 3000-6500 Kelvin.
- Fig. 2 shows in greater detail a combination of phosphor 20 and optical device 24 of a headlight module 10 according to the invention.
- This can be achieved by appropriate design of the phosphor surface itself or by appropriate design of the carrier device 18
- Optical device 24 can be an aspherical lens in order to achieve a magnification and thereby project the intermediate image onto the phosphor 20 into infinity. This is the case with automobile headlights from a distance greater than 25 m.
- the focal plane of such aspherical lenses that is to say the plane from which the image is sharply focused, is not planar, but typically a curved surface. It is therefore particularly preferred to design the surface of the phosphor 20, or the carrier device 18 for the phosphor 20, preferably as a sphere or, more generally, as a conic section.
- the optical device 24 can also represent a free-form lens in order to deliberately distort the image.
- the light distribution can be stretched into peripheral areas in order to keep the actual phosphor matrix, i.e. the rows and columns on the phosphor 20 to be set by the control device 34, but nevertheless an expansion of the light distribution to larger areas to enable.
- Fig. 3 shows a schematic representation of an embodiment in which the optical device 24 is designed as a reflection device.
- the reflection device can be parabolic in shape and then fulfills a similar purpose as an aspherical lens, that is to say rays emanating from a point are imaged into infinity, that is to say made parallel. Since the luminescent material 20 only emits into a half-space, a maximum of a quarter reflector shell is required.
- Freeform reflectors can, in turn, deliberately distort the light distribution, that is to say one can work with different magnification and distortion factors in the different areas of the reflection device.
- Reflection devices also have the advantage that the fluorescent material 20 can be attached above, below or to the side in the direction of travel, 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.
- different length-to-width ratios of the exit surface can be realized, whereby a great freedom of choice can be achieved for the design of a headlight equipped with a headlight module 10 according to the invention.
- Fig. 4 shows a CIE standard color table in which combinations of excitation radiation sources 12 and phosphors 20, such as can be used for a headlight module according to the invention, are shown by way of example.
- the curve line 36 represents the spectral color line.
- Curve line 38 encloses a field that is considered white according to the ECE regulations.
- the white point 40 is also drawn in.
- the curve 42 reproduces the Planck curve.
- a headlight module 10 according to the invention in a vehicle headlight requires white light, with "white” being defined by the ECE regulations and the CIE standard.
- the color location is preferably placed in the vicinity of the white point 40 (approx. 5500 K or even up to 6500 K) in order to generate light colors similar to daylight.
- the phosphor 20 Depending on the pump wavelength of the laser used as radiation source 12, which can be between 400 and 480 nm, the phosphor 20 must therefore have its center of gravity between 570 and 590 nm. 590 nm produces warm white light and 570 nm with a pump wavelength of around 410 nm produces cold white light.
- Some combinations are shown as examples in FIG. 6.
- the straight connecting line goes through the white field 38 and the color location can be set there.
- the most efficient solution is a phosphor with 570 nm, as this is at the maximum of V ( ⁇ ) and can be achieved with a pump wavelength of the laser of 405 nm.
- Phosphors 20 are used as they are already used today for light-emitting diodes for generating white light.
- the phosphor 20 is yttrium aluminum garnet doped with cerium (YAG: Ce) or related garnets with doping in different concentrations.
- YAG: Ce cerium
- Various embodiments of such phosphors 20 can be EP 1 471 775 can be removed.
- Further typical phosphors are calsine, phosphors of the SCAP type, nitridosilicates and chlorosilicates, oxynitrides and silicates, in particular orthosilicates, as they are already known per se and are used for mixing in order to generate white light.
- phosphors that emit red light such as nitrides
- the use of phosphors that emit red light, such as nitrides, in the phosphor mixture 20 also ensures that the white light contains more than 5% of the red content required by law for vehicle headlights.
- a laser or a laser diode which emits ultraviolet radiation or blue light is used as the radiation source 12 for exciting the phosphor mixture 20.
- a UV radiation source can also be used as the radiation source 12 instead of the laser emitting blue light.
- the radiation source 12 instead of the laser emitting blue light.
- at least two different phosphors are required for generating white light, the color locations of which are diametrically opposite to the white point 40. This results in an increased color quality because of the spectrum of 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 the radiation from the radiation source 12 and the radiation emitted by one or more phosphors. This allows the wavelength of the emitted light to be controlled very well, which makes color control much easier than with today's white LEDs.
- the color quality i.e. the color rendering index
- the entire color space spanned by the phosphors can be represented by different modulation of the different colors.
- the control device 34 is also designed to set the range setting to a predetermined value if communication with the motor vehicle fails. At the same time, the control of the beam steering device 14 is preferably switched to normal low beam by means of a permanently stored light distribution in order to protect the phosphor 20.
- the radiation source 12 fails or works incorrectly or at low power, provision is also made to signal the driver that there is a defect, typically by means of a corresponding warning lamp on the dashboard. This informs the driver of the restricted functionality and the need to visit a workshop.
- a warning signal is also generated for the driver and the radiation source 12 is switched off. Finally, provision is made to deactivate the radiation source 12 if the vehicle is in a workshop for maintenance and the headlight module 10 has to be opened. This reliably protects the maintenance personnel. Likewise, a safety device can also be provided which switches off the radiation source 12 in the event of an open headlight housing or in the event of an accident, in particular if the headlight housing is broken.
- 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)
Claims (10)
- Bloc optique (10) comprenant- au moins une substance luminescente (20) qui est excitable, pour l'émission de lumière, au moyen d'un rayonnement électromagnétique, et- au moins une source de rayonnement (12) servant à l'excitation de l'au moins une substance luminescente (20) ;où le bloc optique (10) comprend en outre :- au moins un dispositif support (18) pour l'au moins une substance luminescente (20) et- au moins un dispositif de direction du faisceau (14) qui est disposé de manière telle, qu'il dirige sur l'au moins une substance luminescente (20), un rayonnement électromagnétique émis par l'au moins une source de rayonnement (12),caractérisé en ce que l'au moins un dispositif support (18) est configuré en étant transparent et appliqué sur un dispositif à filtre optique (16) qui est conçu pour réfléchir au moins partiellement un rayonnement émis par l'au moins une substance luminescente (20), où le bloc optique (10) comprend en outre un dispositif de commande (34) pour l'au moins un dispositif de direction du faisceau (14) et pour l'au moins une source de rayonnement (12), où l'au moins un dispositif de direction du faisceau (14) comprend un dispositif à micromiroir, et où le dispositif de commande (34) est conçu pour allumer ou éteindre la source de rayonnement (12) en fonction de la position ou orientation d'au moins un micromiroir du dispositif à micromiroir.
- Bloc optique (10) selon la revendication 1, où le bloc optique (10) comprend en outre au moins un dispositif optique (24) au moins partiellement transparent qui est disposé dans la trajectoire du faisceau du rayonnement émis par l'au moins une substance luminescente (20).
- Bloc optique (10) selon la revendication 1, où l'au moins un dispositif de direction du faisceau (14) est disposé de manière telle, que le rayonnement émis par l'au moins une source de rayonnement (12), avant qu'il soit incident sur la substance luminescente (20), traverse le dispositif à filtre optique (16) et le dispositif support (18).
- Bloc optique (10) selon l'une quelconque des revendications précédentes, où l'au moins une substance luminescente (20) est appliquée, comme un revêtement, sur une surface du dispositif support (22).
- Bloc optique (10) selon l'une quelconque des revendications précédentes, où le bloc optique (10) comprend au moins un dispositif séparateur de faisceaux (30) qui est disposé entre l'au moins une source de rayonnement (12) et l'au moins un dispositif de direction du faisceau (14).
- Bloc optique (10) selon l'une quelconque des revendications précédentes, où le dispositif optique (24) comprend au moins un dispositif de réflexion qui est disposé de manière telle, que le rayonnement émis par l'au moins une substance luminescente (20) soit incident sur l'au moins un dispositif de réflexion.
- Bloc optique (10) selon l'une quelconque des revendications précédentes, où le dispositif optique (24) comprend au moins une lentille asphérique ou respectivement une lentille à forme libre.
- Bloc optique (10) selon l'une quelconque des revendications précédentes, où la source de rayonnement (12) est au moins une diode laser ou un agencement de diodes laser.
- Bloc optique (10) selon l'une quelconque des revendications précédentes, où il est prévu un dispositif de sécurité servant à l'arrêt automatique de la source de rayonnement (12), dans le cas d'un boîtier de projecteur ouvert.
- Projecteur d'un véhicule comprenant un bloc optique selon l'une quelconque ou plusieurs des revendications 1 à 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20130192971 EP2725293A1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
| EP14193460.4A EP2851611B1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201010028949 DE102010028949A1 (de) | 2010-05-12 | 2010-05-12 | Scheinwerfermodul |
| PCT/EP2011/057314 WO2011141377A1 (fr) | 2010-05-12 | 2011-05-06 | Module de projecteur |
Related Child Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14193460.4A Division-Into EP2851611B1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
| EP14193460.4A Division EP2851611B1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
| EP20130192971 Division-Into EP2725293A1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
| EP20130192971 Division EP2725293A1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP2507545A1 EP2507545A1 (fr) | 2012-10-10 |
| EP2507545B1 EP2507545B1 (fr) | 2015-02-25 |
| EP2507545B2 true EP2507545B2 (fr) | 2020-11-18 |
Family
ID=44201932
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11719235.1A Not-in-force EP2507545B2 (fr) | 2010-05-12 | 2011-05-06 | Module d'un phare de véhicule |
| EP14193460.4A Not-in-force EP2851611B1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
| EP20130192971 Withdrawn EP2725293A1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14193460.4A Not-in-force EP2851611B1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
| EP20130192971 Withdrawn EP2725293A1 (fr) | 2010-05-12 | 2011-05-06 | Module de phare |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US20130058114A1 (fr) |
| EP (3) | EP2507545B2 (fr) |
| JP (2) | JP2013526759A (fr) |
| KR (1) | KR101805049B1 (fr) |
| CN (2) | CN102939500A (fr) |
| DE (1) | DE102010028949A1 (fr) |
| WO (1) | WO2011141377A1 (fr) |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20130082090A (ko) | 2013-07-18 |
| KR101805049B1 (ko) | 2017-12-05 |
| EP2725293A1 (fr) | 2014-04-30 |
| JP6092180B2 (ja) | 2017-03-08 |
| JP2015043346A (ja) | 2015-03-05 |
| WO2011141377A1 (fr) | 2011-11-17 |
| DE102010028949A1 (de) | 2011-11-17 |
| EP2851611A2 (fr) | 2015-03-25 |
| JP2013526759A (ja) | 2013-06-24 |
| EP2507545A1 (fr) | 2012-10-10 |
| US20130058114A1 (en) | 2013-03-07 |
| EP2507545B1 (fr) | 2015-02-25 |
| CN104848134A (zh) | 2015-08-19 |
| EP2851611A3 (fr) | 2015-04-08 |
| EP2851611B1 (fr) | 2018-11-21 |
| CN104848134B (zh) | 2017-10-31 |
| CN102939500A (zh) | 2013-02-20 |
| US20150124468A1 (en) | 2015-05-07 |
| US9702519B2 (en) | 2017-07-11 |
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