DE102008022795A1 - Motor vehicle headlight has semiconductor lasers as light source of motor vehicle headlight, and light modulator which modifies directional characteristic of light - Google Patents

Motor vehicle headlight has semiconductor lasers as light source of motor vehicle headlight, and light modulator which modifies directional characteristic of light

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Publication number
DE102008022795A1
DE102008022795A1 DE102008022795A DE102008022795A DE102008022795A1 DE 102008022795 A1 DE102008022795 A1 DE 102008022795A1 DE 102008022795 A DE102008022795 A DE 102008022795A DE 102008022795 A DE102008022795 A DE 102008022795A DE 102008022795 A1 DE102008022795 A1 DE 102008022795A1
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DE
Germany
Prior art keywords
light
motor vehicle
vehicle headlight
preceding
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE102008022795A
Other languages
German (de)
Other versions
DE102008022795B4 (en
Inventor
Roland Dr. Schulz
Frank Singer
Ulrich Dr. Steegmüller
Thomas Zeiler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram Opto Semiconductors GmbH
Original Assignee
Osram Opto Semiconductors GmbH
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Priority to DE102008022795.1A priority Critical patent/DE102008022795B4/en
Publication of DE102008022795A1 publication Critical patent/DE102008022795A1/en
Application granted granted Critical
Publication of DE102008022795B4 publication Critical patent/DE102008022795B4/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

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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

The motor vehicle headlight has semiconductor lasers as light source (1) of the motor vehicle headlight, and a light modulator which modifies the directional characteristic of the light. The light is radiated from the semiconductor lasers. The light modulator has a micro-electromechanical optical system, particularly a micromirror array, a liquid crystal display (LCD) panel, a liquid crystal on silicon (LCoS) panel or a grating light value.

Description

  • The pamphlets WO 2006/102882 A1 . JP 2003/295319 A and EP 0291475 each describe a motor vehicle headlight.
  • A The problem to be solved is a motor vehicle headlight in which different light functions such as dipped beam, High beam, highway light and cornering light on as possible simple way can be generated.
  • At least an embodiment of the motor vehicle headlamp comprises the Automotive headlamp at least a semiconductor laser, as a light source of the vehicle headlight serves. The semiconductor laser can be part of the light source his or the light source of the car headlamp as the only Form light-generating element. In particular, it is possible that the motor vehicle headlights exclusively semiconductor lasers as light-generating elements.
  • One Semiconductor laser is characterized by being a quasi-point light source forms and therefore allows the use of very compact optics.
  • At least an embodiment of the motor vehicle headlamp comprises the Automotive headlamp also has a light modulator, the radiation characteristics of the light emitted by the semiconductor laser light in a predeterminable manner changed. The light modulator is the semiconductor laser in Downstream of the semiconductor laser. The light modulator changed the emission characteristics of the semiconductor laser such that the motor vehicle headlights a specific, predetermined radiation characteristic can be generated can.
  • Under Radiation characteristic is, for example, the spatial Intensity and / or brightness distribution of the motor vehicle headlight understand the emitted light. With the help of the light modulator can a situation-adapted radiation characteristic of the vehicle headlamp be modulated. So can the emission characteristics of the headlamp for example, the weather conditions, the environment (city, Highway, motorway), the lighting conditions, Direction changes of the motor vehicle and / or the inclination be adapted to the motor vehicle.
  • With regard to the different emission characteristics of a motor vehicle headlamp is also on the publication WO 2006 / 102882A1 The disclosure content of which is hereby expressly incorporated by reference to the different emission characteristics of motor vehicle headlamps.
  • At least an embodiment of the motor vehicle headlamp comprises the Automotive headlamp at least a semiconductor laser as a light source of the vehicle headlamp and at least one light modulator, the Emission characteristic of the emitted light from the semiconductor laser changed in a predeterminable way.
  • At least an embodiment of the motor vehicle headlamp comprises the Light modulator at least one mirror at least in operation an axis of the mirror oscillates. The mirror is for example, by at least one micromirror. The mirror will illuminated by the at least one semiconductor laser of the light source. Due to its oscillation around at least one axis, the light becomes of the semiconductor laser - depending on the time of impact - in deflected different directions.
  • there It is possible that the light modulator is exactly one mirror includes, which about two axes, for example, an X and a orthogonal Y-axis is movable and in operation of the car headlamp these axes oscillate. It is also possible that the Light modulator, for example, comprises two mirrors, wherein a first Mirror oscillates around a first axis and a second mirror around a second axis which is orthogonal to the first axis, for example is arranged.
  • At least an embodiment of the motor vehicle headlamp comprises the Car headlight is a control device that controls the beam power of the laser is modulated such that predetermined areas of the mirror be illuminated with a predetermined beam power. For example If the semiconductor laser is a highly frequent modulatable Semiconductor lasers. The semiconductor lasers irradiate one in two axes - for example X and Y axis - oscillating mirror, the laser beam along any direction on the lane to be illuminated distracting.
  • Image scanning through the mirror can be done in different ways. For example, the image can be written pixel by pixel, line by line. For that is a fast movement of the Mirror along the lines, that is, for example, in the direction of the X-axis, and a slow movement along the columns, that is, for example, in the Y direction, required.
  • It but can be technically easier to implement and thus advantageous be that the mirror in the direction of both axes an equally fast Movement - for example, the same oscillation frequency - has. But the pixels of the picture can not do any more - like described above - written in order. The In this case, images can be roughly along high-frequency Lissajous curves are built. The order along the the pixels of the image are built up, does not affect that to be written image - so for example, the displayed Radiation.
  • there can be reflective on the example rectangular Surface of the mirror by modulating the beam power the laser by means of the control device exact areas such as For a dipped beam typical shutter edge are recessed. That is, the emission characteristic radiated from the headlamp can have a defined light-dark transition - the Shutterkante.
  • With Help the controller can also other lighting functions how parking light or high beam are generated.
  • alternative For example, the control device can control the beam power of the laser modulate that, depending on the radiation characteristic to be generated only certain areas of the reflective surface of the or the mirror will be illuminated. That is, in this Case is the scan field, so the area of the mirror, which of the Laser is scanned and thereby illuminated, adjusted accordingly.
  • At least an embodiment of the motor vehicle headlamp comprises the Automotive headlight at least two semiconductor lasers as a light source, whose light mixes with white light. For example the headlight includes an RGB light source, that is the light source includes, for example, a red light and a blue light emitting semiconductor laser, each as an edge emitter can be trained. In addition, includes the light source is a green emitting semiconductor laser, for example, by an infrared emitting semiconductor laser may be formed, in the resonator, a frequency doubling optically nonlinear crystal is arranged. It is also possible that the semiconductor laser emits green light per se.
  • The Light of the semiconductor laser of the light source passes through, for example an achromatic lens which serves as a beam combiner. The means the spatially separated laser beams, The red, green and blue lasers are replaced by the achromatic one Lens merged into a single beam, which then forms a laser beam of white mixed light.
  • According to at least one embodiment of the motor vehicle headlamp, the motor vehicle headlamp comprises a semiconductor laser as the light source, which generates light in operation in a first frequency range. The first frequency range is, for example, the frequency range for blue light. The blue laser light strikes the reflective surface of at least one mirror, which serves as a light modulator and which oscillates about at least one axis. The reflective surface of the at least one mirror is at least locally, preferably completely, covered by a converter layer, which converts the light of the first frequency range at least partially into light of a second frequency range. The light of the second frequency range is, for example, yellow light. In this way, from the mirror of the blue laser light and the yellow frequency-converted light existing white mixed light is reflected. The converter layer comprises, for example, a luminescence conversion material introduced into a matrix material, as described, for example, in the document WO98 / 12757 is described.
  • At least an embodiment of the motor vehicle headlamp comprises the Light modulator at least one micro-electro-mechanical optical System. In the micro-electro-mechanical optical system can For example, it is a micromirror array (DMD - Digital Mirror Device), an LCD panel, an LCoS panel (LCoS - Liquid Crystal on Silicon) or a Grating Light Valve.
  • Of the At least one semiconductor laser of the light source is preferably operated continuously (cw operation). The radiation characteristic of the vehicle headlamp is by means of the light modulator by a change 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). Advantageous is the exact and very flexible control option the illuminated surface of the micro-electro-mechanical optical system.
  • at Using a Grating Light Valve will cause each line of the generating image - for example, the one to be generated Radiation characteristic - written at once. This means, a scanning of the line by the laser can be omitted. To produce a complete picture by means of the Grating Light Valve will be oscillating mirror used by the Grating Light Valve radiated light is illuminated.
  • At least an embodiment of the motor vehicle headlight occurs from the at least one semiconductor laser of the light source generated in operation Light before hitting the light modulator through a diffuser. The diffuser can be, for example, a light-scattering Act diffuser plate. In the light-diffusing diffuser plate Light scattering particles are introduced into a matrix material and / or the surface of the plate is roughened, so that as light passes through the plate, scattering occurs. With Help of the diffuser it is possible to use the light modulator to illuminate evenly.
  • In Emission direction, the light modulator also has a projection optics be downstream, which the image generated by the light modulator projected the surface to be illuminated.
  • All in all is the vehicle headlamp described here in use a micro-electro-mechanical optical system as a light modulator Among other things, the idea that underlies with the help of the light modulator in the manner of a projection optical device a desired Radiation characteristic on the surface to be illuminated - for example the street - can be projected. Under use stored settings for the micro-electromechanical optical system, it is thus possible in a simple way and a variety of radiation characteristics on the road to project.
  • At least an embodiment of the motor vehicle headlamp comprises the Automotive headlamp at least one optical element whose optical Properties are changeable and adjustable. In which optical element, for example, by external Pressure if necessary by means of a piezo or by an applied Voltage the focal length can be changed and adjusted. The optical element preferably forms the light modulator of Car headlamps and can be designed as adaptive optics.
  • By the change is at least one optical property it possible to increase the power of the optical element passing laser light and / or the angular spectrum of the laser light to change the focus of the optical element. The That is, the laser light focused by the optical element meets, for example, a pinhole. Is the aperture in focus of the optical element, so does the full power of the laser through the aperture. If the focal length of the laser is changed, so the power that passes through the aperture can be reduced because at a constant distance between the optical element and aperture the Aperture is no longer in the focus of the optical element. In addition to the focal length of the lens and the distance between the optical element and diaphragm varies such that the Aperture remains in the focus of the optical element, so only the angle spectrum varies according to the aperture, but not the radiated power.
  • Illuminated one with the light that passes through the aperture a reflector that is similar formed a reflector of a conventional automotive headlamp is, by changing the optical properties produces different emission characteristics of the headlamp become. For example, by changing the Angle spectrum of the radiated light different areas of the reflector. The advantage of such a system is that it uses proven headlamp technology can be largely and on moving elements is waived.
  • At least an embodiment of the motor vehicle headlamp comprises the Light source of the vehicle headlamp at least one semiconductor laser, which is suitable electromagnetic radiation in the infrared spectral range to create. Such an infrared semiconductor laser generates electromagnetic Radiation, for example, in a frequency range of 808-940 nm. The lighting, for example, the street with the infrared laser can with the same light modulator and / or the same optical elements, which also for the other semiconductor laser of the light source be used, done. The light of the infrared laser is doing for a night vision system in the motor vehicle of the headlight integrated, used.
  • In accordance with at least one embodiment of the motor vehicle headlamp, the light source with the at least one semiconductor laser is arranged outside a housing of the motor vehicle headlamp and the light of the light source is guided by means of fiber optics into the housing of the motor vehicle headlamps. That is, in this case, the light source is spatially separated from the vehicle headlight. For example, the light source may be located in a portion of the car where it is particularly accessible for maintenance. It also can Converter materials are embedded in the fiber, so that the light source comprises, for example, a semiconductor laser which generates blue light, which is frequency-converted partially to yellow light when passing through the fiber optics, so that white light from the fiber optic occurs in the housing of the headlamp.
  • The Diffuser plate can also be a luminescence conversion material included, which is suitable, for example, blue laser light to convert yellow laser light. In this way, the diffuser is added Irradiation with blue laser light evenly white light emitted to the light modulator.
  • At least an embodiment of the motor vehicle headlamp comprises the Car headlight is a control device that operates a Light function of the headlamp with a high luminance - for Example a high beam of the car headlight - controls. That is, the control device decides depending of certain measurements, for example, a high beam of the car headlight can be operated.
  • Of the Vehicle headlights described here is based, inter alia, on the realization that for reasons of eye safety It should be noted that the headlight has such a large area must be lit that a harmful power density can not fall into the eyes of an observer. The control device therefore allows the operation of the high beam depending on from the speed of the motor vehicle, which is the motor vehicle headlight such that the operation of the high beam is below a predetermined Limit speed of the motor vehicle is prevented. This means, only if a certain speed limit - for example of 30 km / h - it is through the control device allows the high beam, for example, by the driver of the motor vehicle can be actuated. Below this limit speed is an operation of the high beam then not possible.
  • alternative or in addition, operating the high beam of the Control device as a function of the distance from obstacles be controlled in front of the vehicle headlights, such that the operation of the high beam below a predetermined limit distance prevented is. That is, if objects are too close to the headlight, so the illuminated area is not big enough would. That is, only for distances, at which the power density of the radiated light below a Limiting power density, the operation of the high beam is prevented. The motor vehicle headlight can in this case a system for distance measurement in which, for example, as described above Infrared laser is used.
  • in the Below is the vehicle headlamp described here based on Embodiments and the associated figures explained in more detail.
  • 1 shows a motor vehicle headlamp described here in a schematic view according to a first embodiment.
  • 2 shows a vehicle headlamp described here in a schematic view according to a second embodiment.
  • 3 shows a vehicle headlamp described here in a schematic view according to a third embodiment.
  • 4A and 4B show a vehicle headlamp described here in a schematic view according to a fourth embodiment.
  • In The embodiments and figures are the same or like-acting components each with the same reference numerals Mistake. The illustrated elements are not to scale On the contrary, individual elements can be better Understanding shown exaggeratedly large be.
  • 1 shows a motor vehicle headlamp described here in a schematic view according to a first embodiment. The motor vehicle headlight comprises a headlight housing 5 , In the headlight housing 5 is a light source 1 arranged. According to the first embodiment, the light source includes 1 three semiconductor lasers: a blue semiconductor laser 11 , a red semiconductor laser 12 , a green semiconductor laser 13 , The semiconductor lasers generate laser radiation 101 . 102 . 103 pointing to an achromatic lens 3 meets, which acts as Strahlvereiniger. From the lens 3 occurs white mixed radiation 104 out. The mixed radiation 104 meets a mirror 4 which operates around the X-axis 41 as well as the Y-axis 42 oscillates. The mirror forms the light modulator of the car headlight. For example, the mirror is a micromirror.
  • From the control device 21 become the semiconductor laser of the light source 1 thereby modulated in their beam power such that predetermined areas of the mirror 4 be illuminated with a predetermined 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 given emission characteristic 10 be generated by the headlight. For example, a dipped beam is produced with a bright-dark border 106 (so-called shutter edge), which on the right side of the road an angle 105 with the horizontal, so that an asymmetrical illumination of the road takes place.
  • For different 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 retrieving these control signals, the respective emission characteristic and thus the respective light function of the headlight can be activated.
  • The 2 shows a schematic view of a vehicle headlamp described here according to a second embodiment. In this embodiment, the light source 1 through a blue laser 11 as well as an infrared laser 14 educated. That is, in contrast to the embodiment according to the 1 is in the embodiment according to the 2 from the light source 1 no white light is generated, but blue light. The reflective surface of the mirror 4 is complete with a converter layer 43 coated with a luminescence conversion material. The luminescence conversion material is capable of converting blue light to yellow light. That on the light modulator, that is, the mirror 4 incident laser radiation 101 becomes during the passage of the converter layer 43 partially converted to yellow light, yellow and blue light is from the mirror 4 deflected and produces a radiation characteristic 10 , which depends on the control device 44 controlled mirror movements around the axes 41 . 42 as well as by the control device 21 timed to mirror movement modulated beam power of the light source 1 ,
  • Like the blue laser radiation 101 is also the infrared laser radiation 114 from the mirror 4 steered 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 badly illuminated obstacles.
  • As in the first embodiment, the motor vehicle headlamp further comprises a control device 22 on. The control device 22 is intended to control the operation of a light function of the headlight with a particularly high radiance - such as a high beam - depending on the speed of the vehicle and / or the distance of obstacles in front of the vehicle. The control device therefore allows operating the high beam as a function of the speed of the motor vehicle, which has the motor vehicle headlight such that the operation of the high beam is prevented below a predetermined limit speed of the motor vehicle. That is, only when a certain limit speed - for example, 30 km / h - is reached, it is through the control device 22 allows the high beam, for example, be operated by the driver of the motor vehicle. Below this limit speed operating the high beam is then not possible. Alternatively or additionally, the operation of the high beam of the control device 22 be controlled in dependence on the distance from obstacles in front of the motor vehicle headlights, such that the operation of the high beam is prevented below a predetermined limit distance. The motor vehicle headlamp may in this case comprise a distance measuring system in which, for example, an infrared laser as described above 14 Use finds.
  • In conjunction with the 3 is a third embodiment of a motor vehicle headlamp described here described in more detail with reference to a schematic representation. In this embodiment, the light modulator is not by a mirror 4 but formed by a micro-electro-mechanical optical system. In the present case, it is the micro-electro-mechanical optical system 7 around a micromirror array (DMD) with a plurality of micromirrors, which can oscillate about their x-axis, for example. The blue laser radiation 101 of the blue semiconductor laser 11 first meets a diffuser 6 , which is formed by a diffuser plate, in addition to scattering particles - for example, titanium oxide - also contains a luminescence conversion material. The blue laser light 101 is from the diffuser 6 scattered and partially converted to yellow light, leaving white mixed radiation 104 The micro-mirror array illuminates evenly. By means of a control device 77 the image of a desired light function having a desired emission characteristic is generated by the micromirror array. The motor vehicle headlamp may comprise at its light exit side projection optics, which this image as the desired radiation characteristic 10 projected onto the street.
  • In conjunction with the 4A and 4B a fourth embodiment of a motor vehicle headlamp described here is explained in more detail with reference to schematic views. In this embodiment, the light source 1 which, for example, in connection with the 1 or 2 may 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 that has a projection optics 61 may be illuminated in such a way that a predetermined emission characteristic is generated. The change in the focal length takes place so fast that a flicker of the light function thus generated can not be perceived by the human observer.
  • In conjunction with Tables 1, 2 and 3, it is shown how by means of a light source 1 holding a red semiconductor laser 13 , a green semiconductor laser 12 and a blue semiconductor laser 11 includes, a low beam or a high beam with different color temperatures can be generated. About the control device 21 Thus, it is possible to adjust the color temperature by adjusting the operating current of the semiconductor laser 11 . 12 . 13 the light source 1 adjust.
  • That is, in addition to the described by the vehicle headlamp described as simple as possible generating different lighting functions for the headlight, and the color temperature with a light source 1 , as in connection with the 1 is described, can be adjusted in a simple manner.
  • Table 1
  • To produce a color temperature of 4500 K, the following settings must be selected for a dipped beam with a luminous flux of 1000 lm per headlamp: 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 produce a color temperature of 4500 K, the following settings are to be selected for a high beam with a luminous flux of 1600 lm per headlamp: 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 produce a color temperature of 5600 K, the following settings must be selected for a dipped beam with a luminous flux of 1000 lm per headlamp: 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 produce a color temperature of 5600 K, the following settings are to be selected for a high beam with a luminous flux of 1600 lm per headlamp: 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 produce a color temperature of 6000 K, the following settings must be selected for a dipped beam with a luminous flux of 1000 lm per headlamp: 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 lm per headlamp: 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 The invention is not by the description based on the embodiments limited. Rather, the invention encompasses every new feature as well as any combination of features, especially any combination includes features in the claims, also if this feature or combination itself is not explicit in the claims or embodiments is specified.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • - WO 2006/102882 A1 [0001, 0007]
    • - JP 2003/295319 A [0001]
    • EP 0291475 [0001]
    • WO 98/12757 [0019]

Claims (14)

  1. Automotive headlamp with - at least one semiconductor laser ( 11 . 12 . 13 ) as a light source ( 1 ) of the vehicle headlamp and - at least one light modulator, which changes the radiation characteristic of the light emitted by the semiconductor laser light in a predetermined manner.
  2. Motor vehicle headlamp according to the preceding claim, in which the light modulator has at least one mirror ( 4 ) around at least one axis ( 41 . 42 ) of the mirror oscillates.
  3. Motor vehicle headlamp according to the preceding claim with a control device ( 21 ), which determines the beam power of the at least one semiconductor laser ( 11 . 12 . 13 ) is modulated in such a way that predetermined regions of the mirror ( 4 ) are illuminated with 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 whose light ( 101 . 102 . 103 ) to white mixed light ( 104 ) mixes.
  5. Motor vehicle headlight according to one of Claims 2 to 3 with a semiconductor laser ( 11 ) as a light source that is in operation ( 101 ) is generated in a first frequency range, wherein a reflective surface of the at least one mirror ( 4 ) at least in places by a converter layer ( 43 ), which converts the light of the first frequency range at least partially into light of a second frequency range, such that the mirror produces white mixed light ( 104 ) is reflected.
  6. Motor vehicle headlight according to one of the preceding claims, in which the light modulator comprises at least one microelectromechanical 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 the preceding claim, in which the at least one semiconductor laser ( 11 . 12 . 13 ) light generated during operation ( 101 . 102 . 103 ) before impinging on the light modulator by a diffuser ( 6 ) occurs.
  8. Motor vehicle headlight according to one of the preceding claims with at least one optical element ( 9 ), whose optical properties are adjustable.
  9. Motor vehicle headlamp according to the preceding claim, in which the optical properties of the optical element ( 9 ) are adjustable by applying a voltage or mechanical load.
  10. Motor vehicle headlight according to one of the preceding claims, in which the light source ( 1 ) at least one semiconductor laser ( 14 ), which is suitable for generating electromagnetic radiation in the infrared spectral range.
  11. Motor vehicle headlamp according to one of the preceding claims, wherein the light source outside a housing ( 5 ) of the vehicle headlight and the light ( 104 ) of the light source ( 1 ) by means of a fiber optic ( 8th ) in the housing ( 5 ) to be led.
  12. 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 headlamp.
  13. Motor vehicle headlight according to the preceding claim, in which the control device ( 22 ) the operation of the light function with high luminance depending on the speed of the motor vehicle, which has the motor vehicle headlights, controls, such that the operation of the high beam is prevented below a predetermined limit speed of the motor vehicle.
  14. A motor vehicle headlight according to claim 12 or 13, wherein the control device operating the light function with high Luminance depending on the distance of obstacles controls in front of the vehicle headlights, such that the operation of the high beam is prevented below a predetermined threshold distance.
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