EP3899360A1 - Beleuchtungssystem für ein kraftfahrzeug - Google Patents
Beleuchtungssystem für ein kraftfahrzeugInfo
- Publication number
- EP3899360A1 EP3899360A1 EP19805972.7A EP19805972A EP3899360A1 EP 3899360 A1 EP3899360 A1 EP 3899360A1 EP 19805972 A EP19805972 A EP 19805972A EP 3899360 A1 EP3899360 A1 EP 3899360A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- microscanner
- doa
- microscanners
- lighting system
- 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
Links
- 238000009826 distribution Methods 0.000 claims abstract description 104
- 230000010355 oscillation Effects 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 230000005484 gravity Effects 0.000 claims description 21
- 238000005286 illumination Methods 0.000 claims description 9
- 238000012634 optical imaging Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000005424 photoluminescence Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
-
- 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
- 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
- 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
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/36—Combinations of two or more separate reflectors
Definitions
- the invention relates to a lighting system for a motor vehicle, which
- Lighting system includes:
- a first laser scanner with at least one laser light source the laser light source being assigned a first microscanner, which first microscanner is set up to direct laser beams from the laser light source onto a first light conversion element, as a result of which visible light is emitted at the first light conversion element and a first light image is generated, the first light conversion element being an optical one
- Imaging system is assigned in order to image the first light image in front of the lighting system as a first partial light distribution
- Laser light source is assigned a second microscanner, which second microscanner is set up to direct laser beams from the laser light source onto a second light conversion element, whereby visible light is emitted at the second light conversion element and a second light image is generated, an optical imaging system being assigned to the second light conversion element the second photo before
- Imaging the lighting system as a second partial light distribution the first and the second partial light distribution being changeable depending on at least three parameters that can be set on the respective microscanners, the changeable first and second partial light distributions producing a common changeable total light distribution in front of the lighting system and at least partially overlapping, the total light distribution has an opening angle, and wherein the first and the second microscanner are each rotatably mounted about an axis which are arranged parallel to one another, the first and the second
- Microscanners can swing around a zero position with a definable oscillation amplitude AMP, the oscillation amplitude being a maximum value MEMSmax is limited, the oscillation amplitude AMP determining a horizontal width of the partial light distribution generated in each case, and wherein the first and the second microscanners are arranged along an imaginary line, the zero position of the first microscanner by a first angle ALPHA and the zero position of the second microscanner a second angle ALPHA 'are arranged inclined to the imaginary line, the first and the second angle being inverse to one another, and the first and the second partial light distribution each having a light center, which is characterized in that the respective light intensity is maximum at this point , wherein the light center of gravity on the respective microscanners can be shifted in accordance with a definable light center of gravity shift LSPV, and wherein the partial light distributions can each be shifted by an offset value OPPSET that can be supplied to the respective microscanners,
- control device which is set up to control the first and the second microscanners, the oscillation behavior of the first and second microscanners being at least via the parameters oscillation amplitude AMP,
- Control device are changeable, is controllable.
- the invention further relates to a motor vehicle with at least one lighting system according to the invention.
- Laser projection systems can be realized by deflecting a laser beam using so-called microscanners.
- microscanners can e.g. than in MEMS or
- MOEMS technology Micro-Electro-Mechanical Systems or Micro-Opto-Electro-Mechanical Systems manufactured micro mirrors that are only a few millimeters in diameter and can be set in vibration in one or two axial directions.
- the vibration amplitude determines the width of the generated light image or
- Partial light distribution The oscillation speed, ie to vary the angular deflection according to time with a microscanner (angular speed). Since a "slowly" moving light spot generates more light in the light conversion element than a fast moving light spot, the light distribution can also be influenced in this way.
- Vibration amplitudes form undesirable effects, for example two
- control device is set up to receive a time-variable input variable DOA, which represents a target opening angle of the total light distribution, and the parameters
- Vibration amplitude AMP, light center shift LSVP, and offset value OFFSET of the first and second microscanners depending on the test result of a criterion of the input variable DOA, namely DOA ⁇ (MEMSmax - ALPHA), where the maximum vibration amplitude MEMSmax represents the maximum angle about the respective axis, and where if the criterion is met, the parameters of the first
- Microscanners are set as follows:
- LSPV DOA - AMP and the parameters of the second microscanner are defined as follows:
- LSPV - (DOA - AMP).
- laser light sources generally emit coherent, monochromatic light or light in a narrow wavelength range, but in the case of a motor vehicle headlight, white mixed light is generally preferred or prescribed by law for the emitted light, so-called light conversion elements for converting essentially monochromatic light into are given to the laser light sources white or
- This light conversion element is designed, for example, in the form of one or more photoluminescence converters or photoluminescence elements, with incident laser beams from the laser light source generally striking the
- Light conversion element having photoluminescent dye meet and excite this photoluminescent dye for photoluminescence, and thereby light in a wavelength different from the light of the incident laser device or
- the light output of the light conversion element essentially has the characteristics of a Lambertian spotlight.
- transmissive refers to the blue portion of the converted white light.
- transmissive structure that is
- the laser beam is reflected or deflected at an interface attributable to the conversion element, so that the blue light component has a different direction of propagation than the laser beam, which is usually designed as a blue laser beam.
- the total light distribution on the road is created by superimposing the partial light distributions, the first laser scanner being located, for example, in a left motor vehicle headlight and the second laser scanner, for example, in a right motor vehicle headlight, whereby the resulting total light distribution is generated by a left and a right motor vehicle headlight of a motor vehicle .
- the laser light sources are dimmable.
- - measured from the imaginary line - the first angle ALPHA is 2 ° and the second angle ALPHA 'is -2 °.
- microscanners are designed as quasi-static microscanners.
- Microscanners can be obtained one-dimensionally (mirror only moves in one direction) or two-dimensionally (mirror moves in two directions at the same time).
- Most currently available microscanners work on a resonant drive principle.
- the MEMS scanners essentially represent mechanical resonant circuits that are excited in their resonance frequency and oscillate sinusoidally. This sinusoidal curve represents a major problem with regard to the utilization of the installed laser power, since the light distribution is always brightest where the microscanner lowest angular velocity reached. With a sinusoidal vibration, the edge area would appear brightest and the middle area or the center of the
- the maximum value MEMSmax of the oscillation amplitude of the microscanners is 6 °.
- control device controls the laser light sources.
- the object of the invention is further achieved by a motor vehicle with at least one lighting system.
- the time-varying target opening angle of the total light distribution DOA changes depending on the speed of the motor vehicle, the target opening angle DOA being reduced as the speed of the motor vehicle increases.
- FIG. 1 shows an exemplary lighting system with a first laser scanner, which comprises a first microscanner, and a second laser scanner, which comprises a second microscanner, the microscanners in each case being inclined by a first and a second angle, and the microscanners being controlled by a control device
- the first laser scanner having a first one
- Partial light distribution and the second laser scanner generates a second partial light distribution, the first and the second partial light distribution together producing an overall light distribution which has an aperture angle, the total light distribution being imaged on a measuring screen,
- Fig. 2 shows an exemplary characteristic of a microscanner, wherein an oscillation amplitude AMP is plotted against the angular velocity, and the maximum
- Vibration amplitude MEMSmax is 6 °
- FIG. 3A shows a representation of a changed vibration amplitude AMP of the characteristic curve from FIG. 2;
- FIG. 3B shows a light center of gravity shift LSVP on the characteristic curve from FIG. 2;
- 3C is an illustration of a shift of a characteristic curve by an offset value OFFSET
- 4A shows the first and second partial light distribution on the measuring screen for different opening angles, the first and second angles of the respective ones
- Microscanner is zero;
- FIG. 4B shows a representation of the total light distribution on the measuring screen, which is composed of the partial light distributions from FIG. 4A;
- Fig. 5A first partial light distributions for certain opening angles, the first
- Microscanner in this example is inclined by 2 °, the light center of gravity being shifted towards the center for the individual partial light distributions shown;
- 5B shows second partial light distributions for specific opening angles, the second microscanner in this example being inclined by -2 °, the light center of gravity being shifted towards the center for the individual partial light distributions shown;
- 6B shows second partial light distributions for specific opening angles, the parameters of the second microscanner being set in accordance with the criterion according to the invention
- FIG. 1 shows an exemplary lighting system 10 for a motor vehicle, which
- Illumination system 10 comprises a first laser scanner 100 with at least one laser light source 110, the laser light source 110 being associated with a first microscanner 120, which first microscanner 120 is set up to direct laser beams from the laser light source 110 onto a first light conversion element 130, thereby at the first
- Light conversion element 130 emits visible light and a first light image is generated, wherein an optical imaging system 140 is assigned to the first light conversion element 130 in order to be the first light image in front of the illumination system 10
- the illumination system 10 comprises a second laser scanner 200 with at least one laser light source 210, with the laser light source 210 being assigned a second microscanner 220, which second microscanner 220 is set up to direct laser beams from the laser light source 210 onto a second light conversion element 230, thereby visible light is emitted from the second light conversion element 230 and a second light image is generated, an optical imaging system 240 being assigned to the second light conversion element 230 in order to image the second light image in front of the illumination system 10 as a second partial light distribution 250.
- the first and second microscanners are quasi-static in this example
- Microscanner trained. 2 shows a diagram which shows the different vibration behavior of a resonant microscanner (in a broken line) and a quasi-static microscanner (in a solid line).
- the resonant microscanners essentially represent mechanical resonant circuits that are excited in their resonant frequency and oscillate sinusoidally. This sinusoidal curve represents a major problem with regard to the utilization of the installed laser power, since the light distribution is always brightest where the
- Microscanner reaches the lowest angular speed.
- Vibration would make the edge area the brightest and the center area or the center of the light distribution darkest, which is why the laser diodes have to be dimmed strongly and therefore only a small percentage can be used.
- the microscanner changes its direction in the edge area, which means that the mirror “brakes” completely and then accelerates in the opposite direction. During this phase, the laser light sources are deactivated, otherwise due to the low average angular velocity in the mirror Reversal area the
- the first and the second partial light distribution 150, 250 can be changed as a function of at least three parameters which can be set on the respective microscanners 120, 220, namely AMP, LSPV and OFFSET, which are illustrated in FIGS. 3A, 3B and 3C, the Changeable first and second partial light distributions 150, 250 generate a common changeable total light distribution 300 in front of the lighting system 10 and at least partially overlap, the total light distribution 300 having an opening angle.
- Total light distribution 300 in the example shown are shown in the figures on a measuring screen MS, which is used, for example, in a lighting technology laboratory and is arranged perpendicular to a main emission direction of the laser scanner.
- a typical distance of such a measuring screen to the device to be measured is 25m according to ECE regulations.
- the first and the second microscanners 120, 220 are each rotatably mounted about an axis XI, X2, which are arranged parallel to one another, the first and the second microscanners 120, 220 about a zero position with a definable vibration amplitude AMP about the respective axis XI , X2 can oscillate, the oscillation amplitude AMP being limited by a maximum value MEMSmax, the oscillation amplitude AMP determining a horizontal width of the partial light distribution 150, 250 generated in each case.
- Microscanners can be changed dynamically (in fine gradations), as a result of which the brightness increases significantly due to the smaller illumination range, for example due to the speed-dependent increase in the illumination range.
- FIG. 3A shows, for example, an oscillation amplitude AMP limited to + / -2 °, it being possible to see that the angular velocity in the region of the zero position of the microscanner is lower than in the characteristic curve from FIG. 2, which causes an increased light intensity.
- the first and the second partial light distribution 150, 250 each have a light center of gravity, which is characterized in that the respective light intensity is maximum at this point, the light center of gravity on the respective microscanners 120, 220
- LSPV can be shifted according to a definable light center shift.
- the light center of gravity results from the deflection area of the microscanner with the lowest angular velocity (the edge areas or reversal points are excluded from this).
- 3B shows one
- the partial light distributions 150, 250 can each be shifted by an offset value OFFSET which can be supplied to the respective microscanners 120, 220, the mode of operation of this
- the microscanner parameter OFFSET makes it possible to add an offset value to the angular movement of the respective microscanner.
- an example is shown with an offset value of 2 ° with an oscillation amplitude of 4 °.
- the light center shift LSPV is set to 0 ° here.
- the lighting system 10 further comprises a control device 400, which is set up to control the first and the second microscanners 120, 220, wherein the
- Vibration behavior of the first and second microscanners 120, 220 can be controlled at least via the parameters vibration amplitude AMP, light center of gravity shift LSVP, and offset value OFFSET, which can be changed by the control device 400.
- the control device 400 is also set up to change over time
- Total light distribution 300 represents, and the parameters of the first and second
- Microscanners 120, 220 accordingly.
- first and the second microscanners 120, 220 from FIG. 1 are arranged along an imaginary line, the zero position of the first microscanner 120 by a first angle ALPHA and the zero position of the second microscanner 220 by a second angle ALPHA 'to the imaginary line arranged inclined, the first and second angles ALPHA, ALPHA 'being inverse to one another, for example the first angle
- FIGS. 4A and 4B show diagrams of the partial light distributions and the resulting total light distributions for different DOA values, the first angle ALPHA and the second angle ALPHA 'being 0 °, and therefore symmetrical partial light distributions occur.
- a symmetrical light distribution exists if the center position of the partial light distribution also corresponds to the center position of the microscanner deflection.
- FIGS. 4A to 6D show the relative light output, which is the reciprocal of the angular velocity of the respective one Corresponds to microscanners.
- the line dotted in FIG. 4A represents a DOA value of 6 °, which is one
- Illumination area is continuously reduced, which means that the light output in the remaining angular range increases sharply. Since both laser scanners in this example from FIGS. 4A and 4B cover an identical angular range in the resulting partial light distribution, the light output is doubled by superimposing the two partial light distributions, which is shown in FIG.
- Partial light distribution does not correspond to the center position or the zero position of the microscanner deflection. This is the case if, for example, the respective microscanners are arranged at an angle to one another. 5A, 5B and 5C, the first angle ALPHA is + 2 ° and the second angle
- ALPHA 'at -2 ° The center position of the partial light distribution is therefore shifted by 2 ° in each case.
- a horizontally wider basic light distribution is generated.
- Partial light distributions are moved back to the center. This is done via the parameter LSPV, which leaves the oscillation amplitude of the microscanner unchanged, however, bring the area in which the microscanner vibrates the slowest closer to the center of the total light distribution or closer to the center on the measuring screen.
- FIG. 5A shows first partial light distributions of the first laser scanner and FIG. 5B shows second partial light distributions of the second laser scanner, again showing several partial light distributions with different vibration amplitudes or for different opening angles of the total light distribution (DOA value).
- DOA value total light distribution
- the control device 400 which controls the first and the second microscanners 120, 220, is set up to receive an input variable DOA that changes over time, which represents a target opening angle of the total light distribution 300 , and the parameters vibration amplitude AMP, light center shift LSPV and offset value OFFSET of the first and second microscanners 120, 220, depending on the test result of a criterion of the input variable DOA, namely DOA ⁇ (MEMSmax - ALPHA), the maximum vibration amplitude MEMSmax represents the maximum angle about the respective axis XI, X2, and the parameters of the first microscanner 120 are defined as follows when the criterion is met:
- LSPV 0 ° and the parameters of the first microscanner 120 are defined as follows if the criterion is not met:
- LSPV DOA - AMP and the parameters of the second microscanner 220 are defined as follows:
- LSPV - (DOA - AMP).
- 6A and 6B show the first and the second partial light distribution, the above-mentioned algorithm for setting the parameters being used by the control device 400.
- FIG. 6A shows that at high DOA values only the left light-dark boundary of the partial light distribution is shifted inwards. At the DOA value of 4 ° (in this example) there is a transition to a symmetrical partial light distribution, as a result of which both the left and the right cut-off line move evenly inwards.
- Fig. 6B shows in principle the first partial light distributions from Fig. 6A only mirrored.
- FIG. 6C shows the superimposition of the partial light distributions from FIGS. 6A and 6B for different DOA values.
- the brightness curve of the partial light distributions or of the basic light distributions that can be generated is not generated solely via the angular speed of the microscanner, since this cannot generate any speed curves, but an additional dimming of the laser light sources is carried out. Especially in
- the laser light source is completely switched off or deactivated.
- the control device 400 is set up here, the laser light sources accordingly
- the courses shown above can be improved by additional dimming of the laser light sources in the “left” and “right” edge area, for example in FIG. 6D, in the sense of a smooth transition from light to dark.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18213455.1A EP3671017A1 (de) | 2018-12-18 | 2018-12-18 | Beleuchtungssystem für ein kraftfahrzeug |
PCT/EP2019/082119 WO2020126298A1 (de) | 2018-12-18 | 2019-11-21 | Beleuchtungssystem für ein kraftfahrzeug |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3899360A1 true EP3899360A1 (de) | 2021-10-27 |
EP3899360B1 EP3899360B1 (de) | 2022-06-29 |
Family
ID=64744652
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18213455.1A Withdrawn EP3671017A1 (de) | 2018-12-18 | 2018-12-18 | Beleuchtungssystem für ein kraftfahrzeug |
EP19805972.7A Active EP3899360B1 (de) | 2018-12-18 | 2019-11-21 | Beleuchtungssystem für ein kraftfahrzeug |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18213455.1A Withdrawn EP3671017A1 (de) | 2018-12-18 | 2018-12-18 | Beleuchtungssystem für ein kraftfahrzeug |
Country Status (4)
Country | Link |
---|---|
EP (2) | EP3671017A1 (de) |
KR (1) | KR102537719B1 (de) |
CN (1) | CN113242949B (de) |
WO (1) | WO2020126298A1 (de) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1077013A (zh) * | 1992-03-03 | 1993-10-06 | 彭格智 | 机动车无耀光无眩目会车车灯 |
JP5842467B2 (ja) * | 2010-11-16 | 2016-01-13 | 株式会社リコー | アクチュエータ装置、このアクチュエータ装置用の保護カバー、このアクチュエータの製造方法、このアクチュエータ装置を用いた光偏向装置、二次元光走査装置及びこれを用いた画像投影装置 |
FR2993831B1 (fr) * | 2012-07-27 | 2015-07-03 | Valeo Vision | Systeme d'eclairage adaptatif pour vehicule automobile |
DE102013216318A1 (de) * | 2013-08-16 | 2015-02-19 | Volkswagen Aktiengesellschaft | Verfahren zum Steuern einer Scheinwerferanordnung für ein Fahrzeug und Scheinwerferanordnung |
AT516666B1 (de) * | 2014-11-24 | 2016-12-15 | Zkw Group Gmbh | Messung der Schwingamplitude eines Scannerspiegels |
AT516848B1 (de) * | 2015-04-27 | 2016-09-15 | Zizala Lichtsysteme Gmbh | Verfahren zum Ansteuern eines Lichtscanners in einem Scheinwerfer für Fahrzeuge sowie Scheinwerfer |
AT517524B1 (de) * | 2015-08-03 | 2017-10-15 | Zkw Group Gmbh | Laserbeleuchtungsvorrichtung für Fahrzeugscheinwerfer |
-
2018
- 2018-12-18 EP EP18213455.1A patent/EP3671017A1/de not_active Withdrawn
-
2019
- 2019-11-21 KR KR1020217018185A patent/KR102537719B1/ko active IP Right Grant
- 2019-11-21 CN CN201980083661.6A patent/CN113242949B/zh active Active
- 2019-11-21 EP EP19805972.7A patent/EP3899360B1/de active Active
- 2019-11-21 WO PCT/EP2019/082119 patent/WO2020126298A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
KR102537719B1 (ko) | 2023-05-30 |
CN113242949A (zh) | 2021-08-10 |
EP3899360B1 (de) | 2022-06-29 |
CN113242949B (zh) | 2023-10-10 |
WO2020126298A1 (de) | 2020-06-25 |
KR20210093297A (ko) | 2021-07-27 |
EP3671017A1 (de) | 2020-06-24 |
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