• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method and a headlight for motor vehicles with at least one modulatable laser light source (1a, 1b, 1c) whose laser beam is directed to a luminous surface (8) via a pivotable micromirror (7) controlled by a mirror drive (9) Phosphor for light conversion, and having a projection system (12) for projecting the fluorescent image generated on the phosphor layer on the road, in which at least two laser light sources (1a, 1b, 1c) are provided, which associated with a laser driver (3) for modulating the beam intensity is, between each laser light source (1a, 1b, 1c) and the micromirror (7) an expansion optics (Sa, Sb, Sc) for generating a fanned laser beam (6a, 6b, 6c) is arranged, the micromirror (7) with fixed Frequency oscillates about an axis, wherein the fanned beams of the at least two laser light sources (1 a, 1 b, 1 c) to form at least two aneinande r lying horizontal light bands (10a, lOb, 10c) on the luminous surface (8) via the micromirror (7) are deflected.
    公开号:AT513909A1
    申请号:T99/2013
    申请日:2013-02-07
    公开日:2014-08-15
    发明作者:Markus Reinprecht；Friedrich Bauer
    申请人:Zizala Lichtsysteme Gmbh；
    IPC主号:
    专利说明:

    P12925
    Headlight for a motor vehicle and method for generating a
    light distribution
    The invention relates to a method for generating a predetermined light distribution with the aid of a motor vehicle headlight on a roadway, in which at least one modulated laser beam is directed via a pivotable micromirror onto a luminous surface having a lightconversion phosphor and the illuminated image generated on the luminous surface is projected onto the roadway.
    Likewise, the invention relates to a headlamp for motor vehicles with at least one modulatable laser light source whose laser beam is directed via a pivotable, controlled by a mirror drive micromirror on a luminous surface, which is a phosphor, often falsely " phosphor " called, for light conversion has, and with a projection system for the projection of the phosphor image generated on the phosphor layer on the road.
    The use of laser light sources in motor vehicles is currently gaining in importance, as e.g. The dimensions of laser diodes are smaller compared to conventional LEDs, which allows more flexible and efficient installation solutions, and also the luminance of the light beam and the light output can be significantly increased.
    In the known solutions, however, no direct laser beam is emitted in order to avoid endangering the eyes of humans and other living beings by the extremely concentrated light beam of high power. Rather, the laser beam is applied to an intermediate converter which uses a luminescence conversion material, " phosphor " called, contains, for example. blue light in preferably " white " Converted light.
    From EP 2 063 170 A2 a headlight for motor vehicles of the type mentioned above has become known, in which certain areas can be left out depending on other road users for illuminating the road with a glare-free adaptive main beam. The beam of a laser is directed via a micromirror which is movable in at least two spatial directions onto a luminous surface which contains a phosphor for converting the laser light into preferably white light. By means of a lens, the luminous image of the luminous surface is projected onto the roadway. Because the micromirror 2/14 PI2925
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    DE 10 2008 022 795 A1 discloses a motor vehicle headlamp in which the beams of three semiconductor lasers of the colors red, green, blue are combined by an achromatic lens into a white beam which impinges on a mirror oscillating about two axes. A control device modulates the Beam power such that predetermined areas of the mirror are irradiated with predetermined power. The mirror may in one embodiment have a coating with a converter material. In another embodiment, a driven micromirror array is provided. A laser beam impinges on a diffuser, which is also light-converting, and which illuminates the micromirror array. Projection optics allow the desired image generated by the mirror array to be projected onto the roadway.
    More generally, there is a desire for more functionalities for adaptive front lighting systems (AFS) with high resolution and short response times. However, the known devices are either very complex in their complexity or show dissolution problems in at least one, usually in the horizontal direction. This also applies to headlamps that use an LED matrix for illumination, with optional segments of the matrix being switched on or off. Here, the resolution is in favorable cases at 1.5 °.
    An object of the invention is to provide a method or a headlamp of the subject type, which has a highly complex structure without improved resolution in the horizontal direction and meets the above requirements for AFS functions.
    This object is achieved by a method of the aforementioned type, in which according to the invention the laser beams of at least two laser light sources are fanned out to form a radiation band and are guided by the micromirror oscillating about an axis to produce at least two light bands adjacent to one another on the luminous surface. An advantageous development of the method according to the invention provides that the distance of the light bands from each other by the mutual angle 3/14 P12925 • I t · · Φ ···· ···· ··········· ··· It is determined on fan-shaped laser beams of the at least two laser light sources and / or on the oscillation amplitude of the micromirror.
    Furthermore, it is expedient if the length of the light bands is adjusted via the oscillation amplitude of the micromirror.
    To achieve the above object, a headlamp of the above-mentioned type can further be used, in which at least two laser light sources are provided, which is associated with a laser control for modulating the beam intensity, arranged between each light source and the micromirror an expansion optics for generating a fanned laser beam is the fixed-frequency micromirror oscillates about an axis, wherein the fanned rays of the at least two laser light sources are deflected over the micromirrors to form at least two adjacent light bands on the luminous surface, wherein the distance of the light bands from each other by the mutual angle of the fanned laser beams the set of at least two laser light sources, the length of the light bands on the luminous surface by the oscillation amplitude of the micromirror and the width of the light bands is determined by the expansion optics ,
    In order to obtain a light image without disturbing dark streaks, it is recommended that the light bands connect directly to each other without a gap.
    It is advantageous if the micromirror is controlled via the mirror drive with its mechanical natural frequency.
    In an expedient embodiment, it can further be provided that the pivoting amplitude of the micromirror can be changed via the mirror drive.
    A practical development of the invention provides that the fanned beams of the at least two laser light sources are deflected over the micromirrors to form at least two superimposed horizontal light bands on the luminous surface.
    This results in an advantageous variant when three laser light sources are provided to form three superimposed light bands on the luminous surface, wherein the 4/14 PI2925
    on the road projected light bands of the light image of a high beam, the light-dark border and a low beam can correspond.
    The invention together with further advantages is explained in more detail below by way of example embodiments, which are illustrated in the drawing. In this shows
    Fig. 1, the essential components of the invention for a headlamp and their context in a schematic representation and
    Fig. La and b further possibilities of illumination of the luminous surface of a headlamp according to the invention.
    With reference to Fig. 1, an embodiment of the invention will now be explained in more detail. In particular, the important parts for a headlight according to the invention are shown, it being understood that a motor vehicle headlamp contains many other parts that allow its meaningful use in a motor vehicle, in particular a car or motorcycle. Lighting starting point of the headlamp are three laser light sources la, lb and lc, each emit a laser beam, which is designated 2a, 2b and 2c, and which is associated with a laser drive 3, this control 3 is used for power supply and also for modulating the beam intensity the individual laser is set up. Under " Modulate " is understood in the context of the present invention that the intensity of a laser light source can be changed, be it continuous or pulsed, in the sense of switching on and off. It is essential that the light output can be changed dynamically analogously, depending on the position of the mirror. In addition, there is still the possibility of switching on and off for a certain time in order not to illuminate defined places
    In turn, the laser driver 3 in turn contains signals from a central headlamp control 4, to which sensor signals sl ... si ... sn can be supplied. These control and sensor signals may, on the one hand, be, for example, switching commands for switching from high beam to low beam or, on the other hand, signals received by light sensors which detect the lighting conditions on the road. 5/14 PI2925 ········
    The laser light sources 1a, 1b, 1c emit blue or UV light, for example, whereby the emitted laser beam 2a, 2b, 2c is fanned out by an expansion optics 5a, 5b, 5c. Such a widening optical system consists in particular of an actual widening optics, as is known in the field of holography for wide widening of a laser beam, and on the other hand from an actual widening optics upstream Lichtbandvorsatz.Optiken for beam shaping of laser beams are known and commercially available, for example, the Linos Laser optics of the Qioptiq Group, whose range of products includes band optics for laser expansion optics. After the flare optics 5a, 5b, 5c are fanned laser beams 6a, 6b, 6c whose cross section is not " punctiform " like that of the laser beams 2a, 2b, 2c, but " line-shaped ".
    The fanned-out laser beams 6a, 6b, 6c impinge on a micromirror 7 and are reflected onto a luminous surface 8, which has a phosphor for light conversion in a known manner. For example, the phosphor converts blue or UV light into " white " Light around. Under " Phosphor " In the context of the present invention, it is understood quite generally to mean a substance or a mixture of substances which mixes light of one wavelength into light of another wavelength or a wavelength mixture, in particular " white " Light, which translates into the term " wavelength conversion " is subsumed. Here, under " white light " Understood light of such a spectral composition, which in humans the color impression " white " causes.
    The only about a single axis a vibrating micromirror 7 is controlled by a mirror drive 9 and set in oscillations of constant frequency, these vibrations may correspond in particular to the mechanical natural frequency of the micromirror. The mirror drive 9 is in turn controlled by the Scheinwerferansteue-tion 4 in order to adjust the oscillation amplitude of the micromirror, with asymmetric swinging can be adjusted about the axis. The driving of micromirrors is known and can be done in many ways, e.g. electrostatic or electrodynamic. In proven embodiments of the invention, the micromirror 7 vibrates, for example, with a frequency of a few hundred Hz and its maximum deflection is a few degrees to 60 °, depending on its activation. The position of the micromirror 7 is expediently returned to the mirror drive 9 and / or to the headlight drive 4. 6/14 P12925 · «♦ · · · · ·······« ♦ · · · · · · · · ♦ # ···· ···· ♦ · ··· ···· · · · · ..... * 6- · .......
    The fanned-out laser beams 6a, 6b, 6c produce horizontal light bands 10c, 10b, 10a on the luminous surface 8, which is generally flat, but need not be flat, the angle of the laser light sources 1a, 1b, 1c being adjusted with respect to the micromirror 7 is that the light bands on the luminous surface 8 superimposed and adjacent to each other, wherein the distance of the light bands from each other is preferably zero. This can be precisely adjusted by corresponding adjustment of the laser light sources 1a, 1b, 1c, and a luminous image 11 is produced on the luminous surface 8, which is composed of the light bands, in the present case three light bands 10a, 10b and 10c. This luminous image 11 is now projected onto the roadway 13 with a projection system 12 as luminous image 11 '. The use of three laser light sources to form three light strips 10'a, 10'b, 10'c projected onto the roadway is particularly expedient since these light bands then correspond to a high beam, the cut-off line and a low beam (apron light).
    It should also be noted that in the drawing all three bands of light 10a, 10b, 10c are drawn at the same height, but that the individual fanned-out light beams in practice do not equal " high " are. For example, the high beam band is " higher " as that for low beam or for the cut-off line whose height dimension is the lowest. When changing the height of individual light bands of course, the angle of the laser or laser beams must be changed to each other again to make the distance between the Lichtbändem equal to zero.
    The term " carriageway " is used here for a simplified representation, because of course it depends on the local conditions, whether the image 11 'is actually on the road or even beyond. It should also be understood that the term " horizontal " is to be understood here in a relative meaning and refers to a flat road or to a normal position of the vehicle. In principle, the light bands 10a ', 10b' and 10c 'of the image 11' projected onto the roadway 13 should essentially but not necessarily be horizontal, which applies even more to the light bands 10a, 10b, 10c on the luminous surface 8.
    It can now be seen that the illuminated image 11 and thus also the road illumination 11 'can be changed on the one hand by adjusting the oscillation amplitude of the micromirror 7, whereby the length of the horizontal light bands 10a, 10b, 10c changes and by adjusting the intensity of the individual laser light sources In addition, the intensity intensity can be adjusted by the intensity 7/14 PI2925 PI2925 ·· • t ···················································································· · · · ♦ · · · · «i ^ l _ · · · · ·« ««
    Distribution within each band of light can be changed. It should be noted that it is possible, high-frequency laser light sources, whether pulsed or continuously modulated intensity to drive, so that in accordance with the respective position of the micromirror 7 arbitrary light distributions within the light bands not only adjustable but also rapidly changeable, if a special terrain or driving situation this requires, for example, when oncoming vehicles or pedestrians are detected by sensors and accordingly a corresponding change in geometry and / or intensity roadway illumination 11 'is desired.
    FIG. 1a and FIG. 1b schematically show further possibilities of controlling or illuminating the luminous area 8 with four or five fanned-out laser beams. In Fig. La it is shown that the middle horizontal light band can be divided into two adjacent light bands lOba and lObb, so you get one above the other and adjacent light bands. Here, for example, the dipped beam would be formed of two strips of two light sources.
    On the other hand, it is also possible, as illustrated in FIG. 1b, to assemble the luminous image from adjacent luminous bands 101... 105 when the mirror 8 oscillates accordingly
    For imaging targeted points or strips that are controllable in their horizontal extent, the laser light sources, depending on the current position of the mirror can be controlled pulsed. To achieve, for example, that light exits the optical system only from 0 ° to + 10 °, the corresponding laser is switched off at an angle position corresponding to this range of the micromirror of light and thus emitted only in the range of 0 ° to + 10 ° ,
    Compared with conventional AFS systems, the method and the headlight according to the invention offer the advantage of enabling a horizontally very high, theoretically infinite resolution, since the light source can be switched on effectively at any time because of the analog oscillation of the micromirror. Also caused by the sharp delimitation of the hidden area of an illuminated object low stray light values, which makes a very good representation of this area possible. 8/14 PI2925 PI2925
    • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
    In comparison with known solutions, in which a micromirror oscillates about two axes, there is a noticeable reduction in the complexity of mirror and laser control. In the known solutions, in fact, oscillation frequencies of the mirror of about 250 Hz in the x-direction and of about 10 kHz in the y-direction are required in order to produce a flicker-free image for the eye. Assuming that in practice a resolution of 200 pixels is necessary, pulse frequencies of the laser of up to 2 MHz are required, which can cause considerable difficulties in terms of the EMC behavior of the system and cable lengths and wiring at great expense under the Aspect of RF lines. 9.14
    权利要求:
    Claims (8)
    [1]
    P12925

    Claims: 1. A method for generating a predetermined light distribution with the aid of a motor vehicle headlamp on a roadway, in which at least one modulated laser beam is directed via a pivotable micromirror onto a luminous area having a light conversion phosphor and the luminous image generated on the luminous area is projected onto the carriageway, characterized in that the laser beams of at least two laser light sources are fanned out to form a beam band and are directed onto the light surface via the micromirror oscillating about an axis for generating at least two light bands lying against one another on the luminous surface.
    [2]
    2. The method according to claim 1, characterized in that the distance of the light bands from each other by the mutual angle of the fanned laser beams of the at least two laser light sources and / or determined by the oscillation amplitude of the micromirror.
    [3]
    3. The method according to claim 1 or 2, characterized in that the length of the light bands is adjusted via the oscillation amplitude of the micromirror.
    [4]
    4. Headlamps for motor vehicles with at least one modulatable laser light source (la, lb, lc) whose laser beam is directed via a pivotable, by a mirror drive (9) controlled micromirror (7) on a luminous surface (8) having a phosphor for light conversion , and with a projection system (12) for projecting the fluorescent image generated on the phosphor layer on the roadway, characterized in that at least two laser light sources (la, lb, lc) are provided, which associated with a Laseransteue- tion (3) for modulating the beam intensity is, between each laser light source and the micromirror (7) an expansion optics (5a, 5b, 5c) for generating a fanned laser beam (6a, 6b, 6c) is arranged, the micromirrors with a fixed frequency oscillates about an axis, wherein the fanned rays of the at least two laser light sources to form at least two adjacent light bands (10a, 10b, 10ba, 10b, 10c; 101 ... 105) are deflected over the micromirror on the luminous surface (8), the distance between the light bands being determined by the mutual angle of the fanned-out laser beams (6a, 6b, 6c) of the at least two laser light sources, the length of the light bands on the Luminous surface is determined by the oscillation amplitude of the micromirror and the width of the light bands by the expansion optics.
    [5]
    5. Headlight according to claim 4, characterized in that the light bands (10a, 10b, 10c) directly, without spacing connect to each other.
    [6]
    6. Headlight according to claim 4 or 5, characterized in that the micromirror (7) via the mirror drive (9) is driven with its mechanical natural frequency.
    [7]
    7. Headlight according to one of claims 4 to 6, characterized in that the Ver-swing amplitude of the micromirror (7) via the mirror drive is changeable.
    [8]
    8. Headlight according to one of claims 4 to 7, characterized in that the fanned beams of the at least two laser light sources to form at least two superimposed horizontal light bands (10a, 10b, 10c) on the luminous surface (8) via the micromirror (7) are redirected.9. Headlamp according to Claim 8, characterized in that three laser light sources (1a, 1b, 1c) are provided on the luminescent surface (8) for the formation of three superimposed light bands (10a, 10b, 10c), the light bands (10th, 10b) projected onto the lane 'a, 10'b, 10'c) of the light image to a high beam, the light-dark boundary and a low beam correspond. 11/14
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1999011968A1|1997-08-29|1999-03-11|Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH|Lighting system for vehicles and method for operating a lighting system of this type|
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    法律状态:
    2017-04-15| HC| Change of the firm name or firm address|Owner name: ZKW GROUP GMBH, AT Effective date: 20170221 |
    2018-10-15| MM01| Lapse because of not paying annual fees|Effective date: 20180207 |
    优先权:
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