EP3227604A1 - Verfahren zum betrieb einer beleuchtungseinrichtung eines kraftfahrzeugs, beleuchtungseinrichtung und kraftfahrzeug - Google Patents
Verfahren zum betrieb einer beleuchtungseinrichtung eines kraftfahrzeugs, beleuchtungseinrichtung und kraftfahrzeugInfo
- Publication number
- EP3227604A1 EP3227604A1 EP15797856.0A EP15797856A EP3227604A1 EP 3227604 A1 EP3227604 A1 EP 3227604A1 EP 15797856 A EP15797856 A EP 15797856A EP 3227604 A1 EP3227604 A1 EP 3227604A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- deflection
- angle
- light beam
- control device
- lighting device
- 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
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
- F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
- F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
- F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
Definitions
- the invention relates to a method for operating a lighting device of a motor vehicle, wherein the lighting device comprises a light source for providing a light beam and a deflection device for deflecting the light beam with a first deflecting angle predeterminable by a control device in a first deflection direction and with a second deflection angle predeterminable by the control device a second deflecting direction that is angled to the first deflecting direction, the first deflecting angle being varied over a first angular range defined by the first critical angle, wherein the second deflecting angle is varied by the control device during the variation of the first deflecting angle over the first angular range to cover a second angular range defined by second critical angle.
- the invention relates to an associated illumination device and an associated motor vehicle.
- illumination devices for illuminating the motor vehicle environment in motor vehicles which, in addition to simple switching of light functions, for example between a dipped beam and a high beam, allow a flexible adaptation of the illuminated area.
- These lighting devices can, for example, provide cornering light functions.
- the entire lighting device can be pivoted by an actuator, the lighting device can have a plurality of separately controllable light sources or it can be provided controllable light aperture in the light path.
- variable light distributions for example for head-up displays, by scanning an image area with a light beam, wherein the intensity of the light beam is varied as a function of location. A light beam is thereby repeatedly guided over the area to be illuminated, for example at a pixel repetition rate of 30 or 60 Hz, so that a stationary light image is created for a viewer.
- a focused light beam for example a laser
- a deflector in two substantially mutually perpendicular directions in order to guide the light beam line by line over a rectangular area to be potentially illuminated.
- a selection of the line within which the light beam is guided typically takes place in discrete steps.
- the guidance of the light beam within each of the lines can be achieved by setting a plurality of discrete deflection angles within the line or by sweeping the respective line continuously, for example in the form of an oscillation, through the deflection device. In areas that are not to be illuminated, the light source is deactivated.
- the invention is therefore based on the object of specifying a method for operating a lighting device of a motor vehicle, which in contrast allows a more effective use of the light power which can be provided by the light source.
- the object is achieved by a method of the type mentioned above, wherein the second critical angle as a function of the respectively set first deflection angle can be specified.
- the deflection device such that a plurality of first deflection angles are sequentially set in order to select a "line" within which the light beam is to be guided, after which the second deflection angle is varied in order to sweep this "line".
- the "lines" can be selected by varying the first deflection angle stepwise over the first angle range by means of the control device.
- the second deflection angle is varied by the control device in this case for each set first deflection angle to the second angle range
- the first deflection angle it is also possible for the first deflection angle to be varied essentially continuously over the first angular range If the variation of the second deflection angle is much higher than the variation of the first deflection angle, the first deflection angle during the sweep is one of "Lines" in each case quasi-stationary, that means he essentially does not change.
- the second critical angles can also be predetermined given a substantially continuous variation of the first deflection angle as a function of the respectively set first deflection angle.
- the critical angles which define the second angular range are predefined as a function of the first deflection angle just set.
- the resulting light distribution on a projection plane behind the deflection device would therefore not be rectangular, but the boundary line of the light distribution can have almost any shapes even with a continuously active light source a light distribution with trapezoidal shape is provided. It is also possible to provide more complex relationships between the first deflection angle and the second limit angle, for example, to generate lateral bulges or bulges of the light distribution.
- the light distribution can be further adapted as needed.
- An essential advantage over a "rectangular" sweeping of the area illuminatable by the illuminating device and a switching off of the light source in areas not to be illuminated is that the switching-off times of the light source can be reduced in the method according to the invention Therefore, in the method according to the invention, it is possible to use a light source with a lower power than a given illumination brightness to be achieved, than with a "rectangular" sweep of the illuminated area.
- the first and second deflection directions may be substantially perpendicular to each other. Deviations from a vertical arrangement can be caused in particular by production tolerances.
- a light source a laser can be used.
- a sweeping of the angular range is on the one hand possible by the deflector also gradually adjusts the second deflection angle to sweep the second angle range.
- the time required to cover the second angle range is typically not linearly scaled with the size of the second angle range.
- a time for a swing operation may be substantially independent of the amplitude. In this, but also in other cases, it may be desirable to keitsver Ecuador within an illuminated by the lighting device area.
- the stepwise variation over the first angular range may be performed such that for at least two pairs of adjacent set first deflection angles, the angular difference between the respectively adjacent first deflection angles is different.
- the first deflection angles, and thus the "lines" are unevenly distributed over the first angular range in this case, and areas in which the adjacent deflection angles are spaced smaller are illuminated brighter than areas where these areas are swept by the light beam more frequently the angular difference between each adjacent deflection angles is greater.
- the second deflection angle can be varied such that the second angle range is swept over several times. If a deflection in the second deflection direction by swinging of the deflecting element, this is for example possible in that certain set first deflection angle are kept longer before a new first deflection angle is set.
- the deflection angle is varied in such a way that in addition at least one further angle defined by at least partially overlapping the second angle range is swept for the second deflection angle before or after the second angle range is swept across the overlapping portion of the further angular range thus becomes the light beam Repainted several times so that the brightness in this part is increased.
- the further angular range can in particular be selected such that it completely encompasses the second angular range or is encompassed entirely by the second angular range.
- the further angular range may be a partial range of the second angular range or vice versa.
- the described procedure makes it possible, in particular, to increase the brightness in a middle region of the second angle range. If a deflection of the light beam by an oscillating deflection element, so the light beam can be guided with a sinusoidal vibration over the second angular range. This means that the light beam is moved more slowly in the range of the second critical angle than in the central region, whereby the illumination at the edges of the brightness distribution is brighter. This can be compensated, at least partially, by repeatedly sweeping over the middle region.
- the light source may be deactivated by the control means at at least one set first deflection angle during the sweep of at least a portion of the second angular range for the second deflection angle. For example, it may be desirable to omit portions of the second angular range, that is, not to illuminate. If, as explained above, a swinging deflection over the second angular range, the areas in the vicinity of the second critical angle can be illuminated more than the central region. By switching off the light source in the immediate vicinity of the second critical angle, this effect can be largely compensated.
- the invention relates to a lighting device for a motor vehicle, comprising a light source for providing a light beam, a deflection device for deflecting the light beam and a control device for controlling the deflection device, wherein the control device and the deflection device are designed to carry out the method according to the invention.
- the features explained for the method according to the invention can also be transferred to the illumination device according to the invention with the advantages mentioned there.
- the deflection device may comprise an electrostatically or electromagnetically controlled micromirror.
- the provision of micromirrors enables a particularly compact design of the illumination device.
- the construction of a micromirror-based deflection device is basically known from the prior art and will not be explained in detail.
- the deflection of a micromirror can take place at least in the second deflection direction such that the micromirror oscillates.
- the oscillations may be excited by at least one actuator based on an electromagnetic or electrostatic attraction.
- the amplitude of an oscillation can be determined by control voltages or control currents for the actuating element. If current or voltage pulses are used to excite the oscillation, then an amplitude can be adjusted by a pulse width modulation of the current or voltage pulses. It is also possible to directly adapt an amplitude of the control voltages or currents.
- an amplitude of the oscillation can also be effected by adapting a frequency of the control voltage or of the control current. If an oscillation of the microgame is excited by a control voltage or by a control current having a frequency slightly above or slightly below the resonant frequency of the micromirror, the amplitude can be influenced by bringing the frequency of the excitation voltage or the excitation current closer to the resonant frequency or further is spaced from this.
- the micromirror may preferably be tiltable in the first and the second deflection direction. Accordingly, at least two adjusting elements can be provided on the micromirror in order to transfer electrostatic or electromagnetic forces to the micromirror, wherein the adjusting elements and a Storage of the micromirror span a triangle. Alternatively, two adjusting elements can be provided for each tilting direction.
- the deflection device may comprise at least two of the micromirrors which can be tilted in different directions.
- a first micromirror acts as a first deflecting element that deflects the light beam in one of the deflection directions
- a second micromirror acts as a second deflecting element that deflects in the second of the deflection directions.
- the light beam is deflected by the deflecting device onto a luminous element which can be excited by the light beam, whereby the luminous element is excited at a position determined by the first and the second deflecting angle to emit light.
- the luminous element can be substantially transparent and it can be a phosphor introduced into the luminous element, or applied to this, which can be excited by the light of the light source.
- blue light can be used to excite the luminous element
- white light can be emitted by the luminous element or white light can be provided by a combination of the light emitted by the luminous element with the incident light.
- the lighting element can light up in the case of illumination with the light beam, in particular for a specific time interval, with which a uniform light image can be provided.
- the light emitted by the luminous element can then be projected into an area to be illuminated, for example, on a street in front of a motor vehicle.
- the invention relates to a motor vehicle, wherein the motor vehicle comprises a lighting device according to the invention.
- the motor vehicle comprises a lighting device according to the invention.
- FIG. 3 is an illustration of a lighted area and an associated deflection pattern in an implementation of an embodiment of the method according to the invention
- Fig. 6 shows another embodiment of an inventive
- Fig. 1 and Fig. 2 each show schematic embodiments of a lighting device of a motor vehicle.
- the illumination devices 1, 11 each comprise a light source 2 for providing a light beam 3 and a deflection device 4, 12 for deflecting the light beam 3 with a first deflection angle predeterminable by a control device 10 in a first deflection direction, which is represented by the arrow 5 and in FIG the image plane is located, and with a predetermined by the control device 10 second deflection angle in a second deflection direction, which is indicated in each case by the arrow 6 and is perpendicular to the image plane.
- the first deflection angle is gradually over a The first angular range defined by the first critical angle varies.
- the second deflection angle is varied by the control device 10 in order to cover a second angular range defined by the second limit angle.
- the second critical angles are each predetermined as a function of the set first deflection angle.
- the stepwise variation of the first critical angle selects "lines" of an area to be illuminated, which are swept by the light beam by varying the second deflection angle.
- the sweeping of the individual "lines”, ie the variation of the second deflection angle, takes place in the form of a high-frequency oscillation with a vibration frequency of a few kilohertz.
- the first deflection angle is varied, for example, in one hundred steps over the first angle range. After each oscillation of the second deflection angle through the second angular range, the first deflection angle is changed.
- the complete sweep of an illuminated area defined by the first and second critical angles becomes a time interval of just over 30 milliseconds required, so that an illumination of the entire area with a frequency of about 30 Hz is possible.
- the illumination appears static to a human eye.
- the illumination devices 1, 11 shown in FIG. 1 and FIG. 2 differ in the specific implementation of the deflection device 4 or 12.
- the deflection device 4 which is shown in FIG. 1
- a single micromirror 8 is provided for deflecting the light beam 3 which is tiltable via an actuator 9 in the first and the second deflection direction in order to deflect the light beam 3.
- the deflected light beam 3 is subsequently supplied to the protective screen 7 of the illumination device 1, which terminates the illumination device relative to the vehicle surroundings.
- additional optical elements for example Apertures to integrate in the optical path from the deflection device 4 to the protective plate 7.
- the actuator 9 is formed by at least two adjusting elements, which span a triangle together with a bearing of the micromirror 8 and which tilt the micromirror 8 by electrostatic or electromagnetic forces. It is also possible that two adjusting elements are provided for each of the tilting directions, which are arranged substantially symmetrically to a mounting of the micromirror 8. A tilt in the first deflection takes place stepwise. In the second deflection direction, an oscillation of the micromirror 8 close to a resonance frequency of the micromirror 8 is excited by corresponding control of the actuating elements by the control device 10. By adjusting the frequency and / or the amplitude of the excitation, an oscillation amplitude can be adjusted in accordance with the respectively specified second critical angle.
- the control device 10 is designed to specify the second limit angle as a function of the respectively set first deflection angle.
- the deflection device 12 comprises the first micromirror 13 with the associated actuator 14, through which a first deflection angle in the deflection deflection represented by the arrow 5 is varied step by step by an actuation by the control device 10.
- the light beam is then directed via the lens 17 onto the second micromirror 15.
- the micromirror 15 By means of the micromirror 15, the light beam 3 is deflected in the deflection direction represented by the arrow 6, which is substantially perpendicular to the deflection direction represented by the arrow 5.
- the micromirror 15 is excited to oscillate in order to periodically vary the deflection of the light beam in the deflection direction represented by the arrow 6 by varying the second deflection angle.
- the control unit 10 adjusts the amplitude or the frequency of the excitation in such a way that that the amplitude of the oscillation is given by the second critical angle.
- FIG. 3 shows a lighted area 19 as it would be imaged in the area of the protective pane 7.
- the illuminated area 19 corresponds to illumination required for a high beam, in which an upper middle angle range in front of the motor vehicle is relatively strongly illuminated, the height of the illumination limit to the lateral edges of the illumination area decreasing.
- the illuminated area 19 is thus substantially triangular.
- the illumination pattern shown can be illuminated in a continuous operation of the light source by the second critical angle depending on the set first deflection angle are given.
- the maximum area illuminated by the illumination device 1, 11 is represented by the rectangle 18.
- the first deflection angle By varying the first deflection angle, the light beam can be deflected in a first deflection direction, which corresponds to the vertical direction in FIG. 3.
- a variation of the second deflection angle leads to a deflection of the light beam in a second deflection direction, which corresponds to a left-right direction in FIG. 3.
- the control device 10 controls the deflection device 4, 12 such that a bright area 19 of the rectangle 18 is illuminated, while a dark area 20 is not illuminated.
- the light source is active during the entire illumination, so that the determination of the bright area 19 and the dark area 20 is effected exclusively by a corresponding specification of the first and second deflection angles.
- the guidance of the light beam for illuminating the bright area 19 is represented by the arrows 21 to 26.
- Each of the arrows 21 to 26 corresponds to a "line” which is selected by a stepwise specification of the first deflection angle, and each of these "lines” is followed by an oscillation of the light beam in the second deflection direction to sweep the second angular range.
- the second angle range is defined in each case by second critical angle, that of a position of the light beam 3 at the arrowheads of the arrows 21 to 26 correspond.
- the amplitude of the oscillation is adjusted such that the second critical angles are predefined as a function of the respective first deflection angle, that is to say the instantaneous "line". This can be done as explained with reference to FIGS. 1 and 2.
- the first deflection angles are unevenly distributed over the first angular range extending from arrow 21 to arrow 26.
- the first deflection angles represented by the arrows 21, 22 are substantially closer to one another than the deflection angles represented by the arrows 25, 26.
- the luminance in this area is also higher than in the area of the arrows 25, 26.
- the control device 10 additionally controls the light source 2 in order to control the Light source 2 at at least one set first deflection angle during the sweep of at least a portion of the second angular range for the second deflection angle.
- the micromirror 8, 16 oscillates in the second deflection over the second angle range represented by the arrow 30, the light source controlled by the control device 10 so that it is activated during the sweeping of the area 27, that emits a light beam 3 and deactivated during a sweep, the area 28, 29.
- the light source is preferably activated in the region 27, in which the micromirrors 8, 16 oscillates at almost constant angular velocity.
- 5 shows a further possibility of varying the brightness within a "line.”
- further angle ranges 32, 33 are defined in the control device 10 for the corresponding "line", that is to say for a predefined first deflection angle be swept over after sweeping the second angle range.
- Fig. 6 shows schematically another embodiment of a lighting device of a motor vehicle.
- the illumination device 34 corresponds largely to the illumination device 1 shown in FIG. 1.
- the light beam through the deflection device in the illumination device 34 according to FIG 4 is directed to a luminous element 35 which is excited by the light beam at a position determined by the first and second deflection angles to emit light.
- the luminous element 35 is formed by introducing a stimulable by the light of the light source 2 phosphor in a transparent plastic.
- the light source 2 may provide a blue light that excites the phosphor to emit white light.
- the light emitted by the light-emitting element 35 is supplied via the lens 36 to the protective pane 7 and radiated from there into the motor vehicle environment.
- the light distribution on the light-emitting element 35 which depends on the excitation by the light source 2 and thus on the deflection pattern of the deflection device 4, is thus imaged by the lens 36 in the automotive environment in order to illuminate it.
- the use of a stimulable by the light beam light-emitting element 35 is independent of the further structure of the illumination device 34. Accordingly, such a light-emitting element 35, for example, in the lighting device 11 shown in Fig. 2 are provided.
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014017919.2A DE102014017919A1 (de) | 2014-12-04 | 2014-12-04 | Verfahren zum Betrieb einer Beleuchtungseinrichtung eines Kraftfahrzeugs, Beleuchtungseinrichtung und Kraftfahrzeug |
| PCT/EP2015/002341 WO2016087025A1 (de) | 2014-12-04 | 2015-11-21 | Verfahren zum betrieb einer beleuchtungseinrichtung eines kraftfahrzeugs, beleuchtungseinrichtung und kraftfahrzeug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3227604A1 true EP3227604A1 (de) | 2017-10-11 |
| EP3227604B1 EP3227604B1 (de) | 2020-07-22 |
Family
ID=54695661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15797856.0A Active EP3227604B1 (de) | 2014-12-04 | 2015-11-21 | Verfahren zum betrieb einer beleuchtungseinrichtung eines kraftfahrzeugs, beleuchtungseinrichtung und kraftfahrzeug |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3227604B1 (de) |
| DE (1) | DE102014017919A1 (de) |
| WO (1) | WO2016087025A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11208030B2 (en) | 2016-07-20 | 2021-12-28 | Lumileds Llc | Adaptive illumination method for vehicle headlight |
| CA3125623C (en) * | 2020-07-21 | 2023-06-27 | Leddartech Inc. | Beam-steering device particularly for lidar systems |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4881255B2 (ja) * | 2007-08-13 | 2012-02-22 | 株式会社小糸製作所 | 車両用前照灯 |
| JP5577138B2 (ja) * | 2010-04-08 | 2014-08-20 | スタンレー電気株式会社 | 車両用前照灯 |
| DE102010028949A1 (de) * | 2010-05-12 | 2011-11-17 | Osram Gesellschaft mit beschränkter Haftung | Scheinwerfermodul |
| DE102012205437A1 (de) * | 2012-04-03 | 2013-10-10 | Bayerische Motoren Werke Aktiengesellschaft | Beleuchtungsvorrichtung für ein Kraftfahrzeug |
| FR3003629B1 (fr) * | 2013-03-22 | 2016-07-15 | Valeo Vision | Systeme d'eclairage multifonction |
| FR3009370B1 (fr) * | 2013-07-30 | 2018-06-15 | Valeo Vision | Systeme d'eclairage a moyens de balayage perfectionnes |
-
2014
- 2014-12-04 DE DE102014017919.2A patent/DE102014017919A1/de not_active Ceased
-
2015
- 2015-11-21 EP EP15797856.0A patent/EP3227604B1/de active Active
- 2015-11-21 WO PCT/EP2015/002341 patent/WO2016087025A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016087025A1 (de) | 2016-06-09 |
| DE102014017919A1 (de) | 2016-06-09 |
| EP3227604B1 (de) | 2020-07-22 |
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