DE102008022795B4 - Motor vehicle headlight - Google Patents

Motor vehicle headlight

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Publication number
DE102008022795B4
DE102008022795B4 DE102008022795.1A DE102008022795A DE102008022795B4 DE 102008022795 B4 DE102008022795 B4 DE 102008022795B4 DE 102008022795 A DE102008022795 A DE 102008022795A DE 102008022795 B4 DE102008022795 B4 DE 102008022795B4
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DE
Germany
Prior art keywords
light
motor vehicle
vehicle headlight
semiconductor laser
preceding
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Active
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DE102008022795.1A
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German (de)
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DE102008022795A1 (en
Inventor
Dr. Schulz Roland
Thomas Zeiler
Dr. Steegmüller Ulrich
Frank Singer
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Osram Opto Semiconductors GmbH
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Osram Opto Semiconductors GmbH
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Publication of DE102008022795A1 publication Critical patent/DE102008022795A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00Arrangements or adaptations of optical signalling or lighting devices
    • B60Q1/0011Arrangements or adaptations of optical signalling or lighting devices with light guides for distributing the light between several lighting or signalling devices
    • 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16Laser 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
    • F21S41/60Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/63Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates
    • F21S41/64Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices
    • F21S41/645Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices by electro-optic means, e.g. liquid crystal or electrochromic devices
    • 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
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24Light guides

Abstract

Automotive headlights with
- At least one semiconductor laser (11, 12, 13) as the light source (1) of the motor vehicle headlight and
- At least one light modulator, which changes the emission characteristic of the light emitted by the semiconductor laser in a predetermined manner, wherein
- The light (101, 102, 103) generated by the at least one semiconductor laser (11, 12, 13) during operation passes through a diffuser (6) before it strikes the light modulator.

Description

  • A vehicle headlight is specified.
  • The pamphlets WO 2006/102882 A1 . JP 2003/295319 A . DE 10 2004 060 475 A1 . DE 197 37 653 A1 . DE 199 07 943 A1 . DE 103 21 564 A1 . DE 199 10 004 A1 . EP 0 291 475 A2 each describe a motor vehicle headlight.
  • One task to be solved is to specify a motor vehicle headlight in which different light functions such as low beam, high beam, motorway light and cornering light can be generated in the simplest possible way.
  • The motor vehicle headlight comprises at least one semiconductor laser, which serves as the light source of the motor vehicle headlight. The semiconductor laser can be part of the light source or can also form the light source of the motor vehicle headlight as the only light-generating element. In particular, it is possible for the motor vehicle headlight to comprise exclusively semiconductor lasers as light-generating elements.
  • A semiconductor laser is characterized by the fact that it forms a quasi-point light source and therefore allows the use of very compact optics.
  • The motor vehicle headlight further comprises a light modulator, which changes the emission characteristic of the light emitted by the semiconductor laser in a predeterminable manner. The light modulator is arranged downstream of the semiconductor laser in the radiation direction of the semiconductor laser. The light modulator changes the radiation characteristic of the semiconductor laser in such a way that a specific, predeterminable radiation characteristic can be generated by the motor vehicle headlight.
  • The radiation characteristic is understood to mean, for example, the spatial intensity and / or brightness distribution of the light emitted by the motor vehicle headlight. With the help of the light modulator, a situation-specific radiation characteristic of the motor vehicle headlight can be modulated. For example, the radiation characteristic of the headlamp can be adapted to the weather conditions, the environment (city, country road, highway), the lighting conditions, changes in direction of the motor vehicle and / or the inclination of the motor vehicle.
  • With regard to the different radiation characteristics of a motor vehicle headlight, reference is also made to the publication WO 2006 / 102882A1 referenced, the disclosure content of which with regard to the different radiation characteristics of motor vehicle headlights is hereby expressly incorporated by reference.
  • The motor vehicle headlight comprises at least one semiconductor laser as the light source of the motor vehicle headlight and at least one light modulator, which changes the emission characteristic of the light emitted by the semiconductor laser in a predeterminable manner.
  • In accordance with at least one embodiment of the motor vehicle headlight, the light modulator comprises at least one mirror which oscillates around at least one axis of the mirror during operation. The mirror is, for example, at least one micromirror. The mirror is illuminated by the at least one semiconductor laser of the light source. Due to its oscillation around at least one axis, the light of the semiconductor laser is deflected in different directions, depending on the point of impact.
  • It is possible for the light modulator to include exactly one mirror, which is movable about two axes, for example an X axis and a Y axis orthogonal to it, and which oscillates about these axes during operation of the motor vehicle headlight. It is also possible that the light modulator comprises, for example, two mirrors, a first mirror oscillating about a first axis and a second mirror about a second axis, which is arranged, for example, orthogonally to the first axis.
  • In accordance with at least one embodiment of the motor vehicle headlamp, the motor vehicle headlamp comprises a control device which modulates the beam power of the laser in such a way that predetermined regions of the mirror are illuminated with a predetermined beam power. For example, the semiconductor laser is a high-frequency modulatable semiconductor laser. The semiconductor lasers irradiate a mirror which oscillates in two axes - for example the X and Y axes - and which deflects the laser beam along any direction onto the road to be illuminated.
  • The image can be scanned by the mirror in different ways. For example, the image can be written pixel by pixel and thus line by line. This requires rapid movement of the mirror along the rows, that is, for example in the direction of the X axis, and slow movement along the columns, for example in the Y direction.
  • However, it can be technically simpler to implement and therefore advantageous that the mirror has the same rapid movement in the direction of both axes, for example the same oscillation frequency. However, the pixels of the image can then no longer be written in sequence, as described above. In this case, the images can be built up along high-frequency Lissajous curves. The order in which the pixels of the image are built up has no influence on the image to be written - for example, the radiation pattern to be displayed.
  • Exact areas such as the shutter edge typical of a low beam can be left out on the, for example, rectangular reflecting surface of the mirror by modulating the beam power of the laser by means of the control device. This means that the radiation characteristic emitted by the headlight can have a defined light-dark transition - the shutter edge.
  • With the help of the control device, other light functions such as parking lights or high beams can also be generated.
  • Alternatively, the control device can modulate the beam power of the laser in such a way that, depending on the radiation characteristic to be generated, only certain areas of the reflecting surface of the mirror or mirrors are illuminated. This means that in this case the scan field, that is to say the area of the mirror which is scanned by the laser and illuminated in the process, is set accordingly.
  • In accordance with at least one embodiment of the motor vehicle headlight, the motor vehicle headlight comprises at least two semiconductor lasers as the light source, the light of which mixes to form white light. For example, the motor vehicle headlight comprises an RGB light source, that is to say the light source comprises, for example, a red light and a blue light-emitting semiconductor laser, which can each be designed as an edge emitter. In addition, the light source comprises a green-emitting semiconductor laser, which can be formed, for example, by an infrared-emitting semiconductor laser, in the resonator of which a frequency-doubling optically non-linear crystal is arranged. It is also possible for the semiconductor laser to emit green light per se.
  • The light from the semiconductor laser of the light source passes through an achromatic lens, for example, which serves as a beam combiner. This means that the spatially separated laser beams, the red, green and blue lasers are brought together by the achromatic lens to form a single beam, which then forms a laser beam from white mixed light.
  • In accordance with at least one embodiment of the motor vehicle headlight, the motor vehicle headlight comprises a semiconductor laser as a light source, which generates light in a first frequency range during operation. The first frequency range is, for example, the frequency range for blue light. The blue laser light strikes the reflecting surface of at least one mirror, which serves as a light modulator and which oscillates about at least one axis. The reflecting surface of the at least one mirror is at least partially, preferably completely, covered by a converter layer which at least partially converts the light of the first frequency range into light of a second frequency range. The light of the second frequency range is, for example, yellow light. In this way, white mixed light consisting of the blue laser light and the yellow frequency-converted light is reflected by the mirror. The converter layer comprises, for example, a luminescence conversion material introduced into a matrix material, as described, for example, in the publication WO 98/12757 A1 is described.
  • According to at least one embodiment of the motor vehicle headlight, the light modulator comprises at least one micro-electromechanical optical system. The micro-electromechanical optical system can be, for example, a micro mirror array (DMD - Digital Mirror Device), an LCD panel, an LCoS panel (LCoS - Liquid Crystal on Silicon) or a grating light valve.
  • The at least one semiconductor laser of the light source is preferably operated continuously (cw operation). The radiation characteristic of the motor vehicle headlight is generated by means of the light modulator by changing the transmission (for example in the case of an LCD panel) or by reflection (for example in the case of a micromirror array, an LCoS panel or a grating light valve). Is an advantage thereby the exact and very flexible control possibility of the illuminated surface of the micro-electromechanical optical system.
  • When using a grating light valve, each line of the image to be generated - for example the radiation characteristic to be generated - is written at once. This means that scanning the line by the laser can be omitted. An oscillating mirror is used to generate a complete image using the grating light valve, which is illuminated by light emitted by the grating light valve.
  • The light generated by the at least one semiconductor laser of the light source during operation strikes the light modulator through a diffuser before it hits it. The diffuser can be, for example, a light-scattering diffuser plate. In the light-scattering diffuser plate, light-scattering particles are introduced into a matrix material and / or the surface of the plate is roughened, so that scattering occurs when light passes through the plate. With the help of the diffuser, it is possible to illuminate the light modulator evenly.
  • Projection optics, which project the image generated by the light modulator onto the surface to be illuminated, can furthermore be arranged downstream of the light modulator.
  • Overall, the motor vehicle headlamp described here, when using a micro-electromechanical optical system as a light modulator, is based, among other things, on the idea that, with the aid of the light modulator in the manner of an optical projection device, a desired radiation characteristic is projected onto the surface to be illuminated, for example the street can. Using stored settings for the micro-electromechanical optical system, it is thus possible to project a large number of radiation characteristics onto the road in a simple manner.
  • According to at least one embodiment of the motor vehicle headlight, the motor vehicle headlight comprises at least one optical element, the optical properties of which can be changed and adjusted. In the case of the optical element, the focal length can be changed and set, for example, by external pressure, if appropriate by means of a piezo or by an applied voltage. The optical element preferably forms the light modulator of the motor vehicle headlight and can be designed as adaptive optics.
  • By changing at least one optical property, it is possible to change the power of the laser light passing through the optical element and / or the angle spectrum of the laser light after the focus of the optical element. That is, the laser light focused by the optical element strikes a pinhole, for example. If the aperture is in the focus of the optical element, the entire power of the laser passes through the aperture. If the focal length of the laser is changed, the power that passes through the diaphragm can be reduced since the diaphragm is no longer in the focus of the optical element if the distance between the optical element and the diaphragm is constant. If, in addition to the focal length of the lens, the distance between the optical element and the diaphragm is varied in such a way that the diaphragm remains in the focus of the optical element, only the angle spectrum after the diaphragm is varied, but not the radiated power.
  • If one illuminates with the light that passes through the diaphragm, a reflector that is designed similar to a reflector of a conventional motor vehicle headlight, different radiation characteristics of the headlight can be generated by changing the optical properties.
  • For example, different areas of the reflector can be illuminated by changing the angular spectrum of the emitted light. The advantage of such a system is that proven headlight technology can be used and moving elements are largely avoided.
  • According to at least one embodiment of the motor vehicle headlight, the light source of the motor vehicle headlight comprises at least one semiconductor laser which is suitable for generating electromagnetic radiation in the infrared spectral range. Such an infrared semiconductor laser generates electromagnetic radiation, for example, in a frequency range from 808 to 940 nm. The street, for example, can be illuminated with the infrared laser using the same light modulator and / or the same optical elements that are also used for the further semiconductor lasers of the light source. The light from the infrared laser is used for a night vision system that is integrated into the headlight's motor vehicle.
  • According to at least one embodiment of the motor vehicle headlight, the light source with the at least one semiconductor laser is arranged outside a housing of the motor vehicle headlight and the light from the light source is guided into the housing of the motor vehicle headlights by means of fiber optics. In this case, this means that the light source is spatially separated from the motor vehicle headlight. The light source can be located, for example, in a section of the car where it is particularly easily accessible for maintenance work. In this case, converter materials can also be embedded in the fiber, so that the light source comprises, for example, a semiconductor laser which generates blue light which is partially converted to yellow light when it passes through the fiber optics, so that white light emerges from the fiber optics in the housing of the headlamp.
  • The diffuser plate can also contain a luminescence conversion material that is suitable, for example, to convert blue laser light to yellow laser light. In this way, white light is emitted uniformly from the diffuser onto the light modulator when irradiated with blue laser light.
  • In accordance with at least one embodiment of the motor vehicle headlight, the motor vehicle headlight comprises a control device which controls the operation of a light function of the headlight with a high luminance - for example a high beam of the motor vehicle headlight. This means that the control device decides on the basis of certain measured values whether, for example, a high beam of the motor vehicle headlight can be operated.
  • The motor vehicle headlamp described here is based, among other things, on the knowledge that, for reasons of eye safety, care must be taken that the headlamp illuminates such a large area that a harmful power density cannot fall into the eyes of an observer. The control device therefore allows the high beam to be operated as a function of the speed of the motor vehicle which has the motor vehicle headlight in such a way that the operation of the high beam is prevented below a predetermined limit speed of the motor vehicle. This means that only when a certain limit speed - for example of 30 km / h - has been reached is it possible for the control device to enable the high beam to be actuated, for example, by the driver of the motor vehicle. It is then not possible to operate the high beam below this limit speed.
  • Alternatively or additionally, the operation of the high beam can be controlled by the control device as a function of the distance from obstacles in front of the motor vehicle headlight, in such a way that the operation of the high beam is prevented below a predefinable limit distance. In other words, objects are too close to the headlight, so that the illuminated area would not be large enough. This means that the driving of the high beam is only prevented for distances at which the power density of the emitted light is below a limit power density. In this case, the motor vehicle headlight can comprise a system for measuring the distance, in which, for example, an infrared laser as described above is used.
  • The motor vehicle headlight described here is explained in more detail below using an exemplary embodiment, further examples and the associated figures.
    • 1 shows a motor vehicle headlight described here in a schematic view according to a first example.
    • 2 shows a motor vehicle headlight described here in a schematic view according to a second example.
    • 3 shows a motor vehicle headlight described here in a schematic view according to an embodiment.
    • 4A and 4B show a motor vehicle headlight described here in a schematic view according to a third example.
  • In the exemplary embodiments and figures, the same or equivalent components are each provided with the same reference numerals. The elements shown are not to be regarded as true to scale; rather, individual elements can be exaggerated for better understanding.
  • 1 shows a motor vehicle headlight described here in a schematic view according to a first example. The motor vehicle headlight comprises a headlight housing 5 , In the headlight housing 5 is a light source 1 arranged. According to the first example, the light source comprises 1 three semiconductor lasers: one blue semiconductor laser 11 , a red semiconductor laser 12 , a green semiconductor laser 13 , The semiconductor lasers generate laser radiation 101 . 102 . 103 on an achromatic lens 3 that acts as a beam union. From the lens 3 occurs white mixed radiation 104 out. The mixed radiation 104 meets a mirror 4 . which in operation around the X axis 41 as well as the Y axis 42 oscillates. The mirror forms the light modulator of the motor vehicle headlight. For example, the mirror is a micromirror.
  • From the control device 21 become the semiconductor laser of the light source 1 modulated in its beam power in such a way that predetermined areas of the mirror 4 are illuminated with a given beam power. Due to the control of the oscillation of the mirror 4 around the axes 41 . 42 through the control device 44 can have a predetermined radiation pattern 10 generated by the headlight. For example, a low beam is generated with a cut-off line 106 (so-called shutter edge), which is an angle on the right side of the road 105 with the horizontal so that the street is asymmetrically illuminated.
  • For various radiation characteristics are in the control device 44 Control signals for the mirror 4 as well as in the control device 21 for the light source 1 specified. By calling up these control signals, the respective radiation characteristics and thus the respective light function of the headlamp can be activated.
  • The 2 shows a schematic view of a motor vehicle headlight described here according to a second example. In this example, the light source is 1 through a blue laser 11 as well as an infrared laser 14 educated. That is, in contrast to, for example, the 1 in the example according to 2 from the light source 1 not white light, but blue light. The reflective surface of the mirror 4 is complete with a converter layer 43 comprising a luminescence conversion material. The luminescence conversion material is suitable for converting blue light into yellow light. The on the light modulator, that is, the mirror 4 incident laser radiation 101 becomes when passing through the converter layer 43 partially converted to yellow light, yellow and blue light is emitted by the mirror 4 distracts and creates a radiation pattern 10 which is dependent on that by the control device 44 controlled mirror movements around the axes 41 . 42 as well as that by the control device 21 modulated beam power of the light source coordinated with the mirror movement 1 ,
  • Just like the blue laser radiation 101 will also be the infrared laser radiation 114 from the mirror 4 directed onto the street. The infrared laser radiation is used, for example, in conjunction with a night vision device, which helps the driver of the motor vehicle to better recognize obstacles that are poorly illuminated.
  • As in the first example, the motor vehicle headlight also has a control device 22 on. The control device 22 It is provided to control the operation of a light function of the headlight with a particularly high beam density - such as a high beam - depending on the speed of the vehicle and / or the distance from obstacles in front of the vehicle. The control device therefore allows the high beam to be operated as a function of the speed of the motor vehicle which has the motor vehicle headlight in such a way that the operation of the high beam is prevented below a predetermined limit speed of the motor vehicle. This means that it is only through the control device when a certain limit speed - for example 30 km / h - has been reached 22 enables the high beam to be actuated, for example, by the driver of the motor vehicle. It is then not possible to operate the high beam below this limit speed. Alternatively or additionally, operating the high beam from the control device 22 can be controlled as a function of the distance from obstacles in front of the motor vehicle headlight, in such a way that the operation of the high beam below a predeterminable limit distance is prevented. In this case, the motor vehicle headlight can comprise a system for distance measurement, in which, for example, an infrared laser as described above 14 Is used.
  • In connection with the 3 An embodiment of a motor vehicle headlight described here is described in more detail using a schematic representation. In this embodiment, the light modulator is not through a mirror 4 , but formed by a micro-electromechanical optical system. In the present case, it is the micro-electromechanical optical system 7 a micromirror array (DMD) with a multitude of micromirrors, which can oscillate, for example, about their X-axis. The blue laser radiation 101 of the blue semiconductor laser 11 first meets a diffuser 6 , which is formed by a diffuser plate which, in addition to scattering particles - for example made of titanium oxide - also contains a luminescence conversion material. The blue laser light 101 is from the diffuser 6 scattered and partially converted into yellow light, so that white mixed radiation 104 the micromirror array illuminates evenly. By means of a control device 77 the image of a desired light function with a desired radiation characteristic is generated by the micromirror array. The motor vehicle headlamp can include a projection optic on its light exit side, which optics this image as the desired radiation characteristic 10 projected onto the street.
  • In connection with the 4A and 4B A fourth example of a motor vehicle headlight described here is explained in more detail using schematic views. In this example, the light source is 1 which, for example, in connection with the 1 or 2 can be formed outside the headlight housing 5 arranged. A fiber optic 8th leads white mixed light 104 to an adjustable optical element 9 whose focal length can be adjusted by applying a voltage. This is done, for example, by the control device 99 , By rapidly changing the focal length of the optical element 9 becomes a reflector 60 which is a projection optics 61 can include, illuminated in such a way that a predetermined radiation characteristic is generated. The focal length is changed so quickly that the human viewer cannot perceive a flickering of the light function generated in this way.
  • In connection with Tables 1, 2 and 3 it is shown how using a light source 1 that have a red semiconductor laser 13 , a green semiconductor laser 12 and a blue semiconductor laser 11 includes a low or high beam with different color temperatures can be generated. About the control device 21 it is thus possible to adjust the color temperature by adjusting the operating current of the semiconductor laser 11 . 12 . 13 the light source 1 adjust.
  • That means, in addition to the generation of different light functions for the headlight as simple as possible by the motor vehicle headlight described here, the color temperature can also be achieved with a light source 1 , such as in connection with the 1 described, can be set in a simple manner. Table 1 To generate a color temperature of 4500 K, the following settings must be selected for a low beam with a luminous flux of 1000 Im per headlight: Semiconductor laser Wavelength [nm] Light output [lm] Light output [W] 13 640 282 2.36 12 532 699 1.16 11 440 22 0.62 To generate a color temperature of 4500 K, the following settings must be selected for a high beam with a luminous flux of 1600 Im: Semiconductor laser Wavelength [nm] Light output [lm] Light output [W] 13 640 452 3.78 12 532 1119 1.86 11 440 36 0.99
    Table 2 To generate a color temperature of 5600 K, the following settings must be selected for a low beam with a luminous flux of 1000 Im per headlight: Semiconductor laser Wavelength [nm] Light output [lm] Light output [W] Red (13) 640 246 2.06 Green (12) 532 742 1.23 Blue (11) 440 12 0.79 To generate a color temperature of 5600 K, the following settings must be selected for a high beam with a luminous flux of 1600 Im: Semiconductor laser Wavelength [nm] Light output [lm] Light output [W] Red (13) 640 394 3.30 Green (12) 532 1188 1.97 Blue (11) 440 20 1.26
    Table 3 To generate a color temperature of 6000 K, the following settings must be selected for a low beam with a luminous flux of 1000 Im per headlight: Semiconductor laser Wavelength [nm] Light output [lm] Light output [W] Red (13) 640 250 2.1 Green (12) 532 724 1.2 Blue (11) 440 31 0.86 To generate a color temperature of 6000 K, the following settings must be selected for a high beam with a luminous flux of 1600 Im: Semiconductor laser Wavelength [nm] Light output [lm] Light output [W] Red (13) 640 398 3.33 Green (12) 532 1153 1.91 Blue (11) 440 49 1.37
  • The invention is not limited by the description based on the exemplary embodiments. Rather, the invention encompasses every new feature and every combination of features, which includes in particular every combination of features in the patent claims, even if this feature or this combination itself is not explicitly specified in the patent claims or exemplary embodiments.

Claims (13)

  1. Automotive headlights with - At least one semiconductor laser (11, 12, 13) as the light source (1) of the motor vehicle headlight and - At least one light modulator, which changes the emission characteristic of the light emitted by the semiconductor laser in a predetermined manner, wherein - The light (101, 102, 103) generated by the at least one semiconductor laser (11, 12, 13) during operation passes through a diffuser (6) before it strikes the light modulator.
  2. Motor vehicle headlight according to the preceding claim, in which the light modulator comprises at least one mirror (4) which oscillates about at least one axis (41, 42) of the mirror.
  3. Motor vehicle headlamp according to the preceding claim with a control device (21) which modulates the beam power of the at least one semiconductor laser (11, 12, 13) in such a way that predetermined areas of the mirror (4) are illuminated with a predetermined beam power.
  4. Motor vehicle headlight according to one of the preceding claims with at least two semiconductor lasers (11, 12, 13) as a light source, the light (101, 102, 103) of which is mixed to form white mixed light (104).
  5. Automotive headlights according to one of the Claims 2 to 3 with a semiconductor laser (11) as light source, which generates light (101) in a first frequency range during operation, wherein a reflecting surface of the at least one mirror (4) is at least partially covered by a converter layer (43) which contains the light of the first frequency range at least partially converted into light of a second frequency range such that white mixed light (104) is reflected by the mirror.
  6. Motor vehicle headlight according to one of the preceding claims, in which the light modulator comprises at least one micro-electromechanical optical system (7), in particular a micromirror array, an LCD panel, an LCoS panel or a grating light valve.
  7. Motor vehicle headlight according to one of the preceding claims with at least one optical element (9), the optical properties of which are adjustable.
  8. Motor vehicle headlight according to the preceding claim, in which the optical properties of the optical element (9) are adjustable by applying a voltage or mechanical load.
  9. Motor vehicle headlight according to one of the preceding claims, in which the light source (1) comprises at least one semiconductor laser (14) which is suitable for generating electromagnetic radiation in the infrared spectral range.
  10. Motor vehicle headlight according to one of the preceding claims, in which the light source is arranged outside a housing (5) of the motor vehicle headlight and the light (104) of the light source (1) is guided into the housing (5) by means of fiber optics (8) ,
  11. Motor vehicle headlight according to one of the preceding claims with a control device (22) which controls the operation of a light function with high luminance, in particular a high beam of the motor vehicle headlight.
  12. Motor vehicle headlight according to the preceding claim, in which the control device (22) controls the operation of the light function with high luminance as a function of the speed of the motor vehicle having the motor vehicle headlight, such that the operation of the high beam is below a predetermined limit speed of the motor vehicle is prevented.
  13. Automotive headlights after Claim 11 or 12 , in which the control device (22) controls the operation of the light function with high luminance as a function of the distance from obstacles in front of the motor vehicle headlight, in such a way that the operation of the high beam is prevented below a predetermined limit distance.
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