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    • 专利摘要:
    A method for driving a light scanner (7) in a headlamp for vehicles, wherein the laser beam of at least one modulated laser light source (1) is scanned by means of the light scanner on a light conversion means (8) to generate a luminous image (11) on this, which is projected onto the roadway as an optical image (11 ') via an imaging system (12), a micromirror (10) of the light scanner is swiveled in at least one coordinate direction according to defined control characteristics, the desired illumination image (11) is converted into a pixel set with n lines and / or m columns, the horizontal and / or vertical control characteristic for the micromirror (10) is adapted to at least one selected line and / or column in terms of the required optical power of the pixels and the adapted horizontal and / or vertical control characteristic for driving the Micromirror is used.
    公开号:AT516848A4
    申请号:T50339/2015
    申请日:2015-04-27
    公开日:2016-09-15
    发明作者:Thomas Mitterlehner；Bettina Reisinger
    申请人:Zizala Lichtsysteme Gmbh；
    IPC主号:
    专利说明:

    Method for driving a light scanner in a headlight for vehicles
    The invention relates to a method for driving a light scanner in a headlamp for vehicles, wherein the laser beam of at least one modulated laser light source is scanned by means of the light scanner is directed to a light conversion means to generate a luminous image on this, which on an imaging system as a light image on the Lane is projected, and a micromirror of the light scanner according to predetermined control characteristics is pivoted in at least one coordinate direction.
    The invention further relates to a headlamp for vehicles, with at least one modulated laser light source, the laser beam is by means of a light scanner scanning on a light conversion means steerable to. to generate a luminous image on this, which is projected via an imaging system as a light image on the road, and a micromirror of the light scanner according to predetermined control characteristics in at least one coordinate direction is pivotable, as well as a laser driver and one of these associated computing unit.
    Headlamps that work with laser beams scanning via a light conversion medium are known. They usually produce a luminous image on a light conversion medium, often called "phosphor" for short, on which the blue laser light, for example, is converted into substantially "white" light by fluorescence. The generated luminous image is then extracted by means of the imaging system, e.g. lens optics projected onto the roadway. The light scanner or beam deflection means is generally a micromirror which can be moved about one or two axes, e.g. The modulation of the laser light source determines for each point or line of the light image the desired luminance, which on the one hand has to comply with legal specifications for the projected light image and on the other hand can be adapted to the respective driving situation
    The use of the light scanner with one or more laser beams, which are modulated in synchronism with the mirror oscillation, makes it possible to produce almost any light distribution. In principle, such a method is also known in the case of so-called pico projectors and head-up displays, which likewise use light scanners which are designed as MEMS (micro-electro-Mecharasche systems). However, in contrast to projection systems, which are often used in consumer electronics, significantly higher laser powers have to be introduced in the case of headlamps, while on the other hand there is no need to represent a colored light distribution. As mentioned above, working with blue laser light, which originates for example from laser diodes, is usually used. In view of the required high laser power in the order of 5 to 30 watts, it is important to make the best possible use of the laser power installed in a headlight.
    Most known light scanners, for which the term "microscanner" is sometimes also used below, operate according to a resonant drive principle. The micromirrors used are excited in their resonant frequency and vibrate sinusoidally. Especially this sinusoidal curve represents a major problem with regard to the utilization of the installed laser power, for which reference is made to FIG. 2. For example, a constant laser power of Pcaser = IW was assumed for this figure and a resolution of 60 × 30 pixels was defined, which represents only one possible example. It can be seen that due to the sinusoidal movement of the micromirror in the center of the image significantly less optical power (0.23 mW / pixel) is present than in the peripheral areas in which the power per pixel is 1.75 mW and in the four corners of the Picture even 9,63 mW.
    Such a light distribution is not desirable in projection applications, especially in head-up displays and Pico projectors, since all the pixels should be the same bright. For this reason, it is known to compensate for the brightness change due to the sinusoidal waveform by modulating the laser power in synchronism with the mirror vibration, thereby reducing the laser power to the edge to obtain a homogeneous light distribution in which each pixel is the same light. In this case, the maximum brightness of the compensated image is adapted to the lowest brightness of the uncompensated image, which, relative to FIG. 2, means that in a compensated luminous image each pixel has an incident laser power of 0.23 mW / pixel.
    Because of the compensation of the brightness curve, the average laser power introduced into the system has to be reduced by 60%, i. In the example according to FIG. 2, the leasers = 1 W of a laser power are used for the means of only 0.4 W, whereby it should be noted that the term "average power" is used here. Even in this light distribution, the laser diode must be able to apply an optical power of 1 W for a short time. However, since the power is reduced in the peripheral areas, results in an average power, which is significantly lower.
    The problem outlined is exacerbated significantly in applications of the scanning method on motor vehicle headlights. Light distributions, which are generated for main light functions in vehicle headlights, namely in the rarest cases in all pixels the same light. On the contrary, in the light distribution of a motor vehicle headlamp, it is even desirable that the edge areas are much darker than the center of the image, usually a so-called Light spot to be generated. This light spot illuminates the roadway, while the edge areas illuminate the roadway environment. For clarity, an exemplary light distribution is considered, which is suitable as additional high beam and shown in Fig. 3. Here it can be seen that in the middle of the picture a high light output is required (100%), whereas in the peripheral areas the brightness already decreases significantly, whereby areas with 30% and 5% are drawn in and labeled. Compensated in this case, the laser power of a sinusoidally oscillating in two directions micromirror, it can be shown that only 13% of the installed laser power are utilized.
    One way to at least partially address this problem is to increase the scan speed, i. for a mirror, the angular deflection after time da / dt to vary. Since a slow-scanning point of light ("spot") generates more light in the light conversion medium than a fast-moving spot, the light distribution can also be influenced in this way, but micromirrors are required that do not vibrate resonantly anymore but are essentially linear at least in one coordinate direction can be controlled.
    In the case of a linearly controlled drive axis of the micromirror, the utilization of the installed laser power can thereby already be increased significantly, namely to approximately 20%. If the second axis of the micromirror is also linearly driven, a further increase in utilization can theoretically be achieved up to 30%. However, even a 30% utilization of the laser power means that you have to install three times as much laser power as theoretically necessary. In practice, this leads to e.g. must install three times the number of laser diodes in a headlight, which, not least because of the need for focusing, significantly affect the price of such a headlight.
    A method or a headlight in which the scan speed is reduced to. To produce regions with higher intensity, are also known from DE 10 2012 205 437 Al, the problem of lack of efficiency is addressed. In addition, the spot diameter of the laser beam can be changed, but the laser power is not changed.
    Furthermore, a headlamp is described in US 2009/0046474 A1, in which the light of at least one light source is directed onto the roadway via an actuated mirror, which can be rotated about one or two axes, via imaging optics. The light source may be turned on or off during scanning, and the brightness may be changed by the rotational speed of the mirror. However, scanning a laser beam over a phosphor to produce a luminous image is not described in this document.
    A headlamp made by a method or a headlamp, as stated above, are known from US 2014/0029282, wherein either the scanning speed or the intensity of the laser beam is changed to produce an adaptive light / light image.
    An object of the invention is to provide a method and a working according to such a method headlights, in which an improved utilization of the installed laser power with the least possible effort for the control, in particular of the micromirror is possible.
    This object is achieved by a method of the aforementioned type, in which according to the invention the desired luminous image has been subdivided into a pixel set with n rows and / or m columns, the horizontal and / or the vertical control characteristic for the micromirror is applied to at least one selected row and / or column is adjusted with respect to the required optical power of the pixels and the adjusted horizontal and / or the vertical control characteristic is used to control the micromirror.
    It is in. For purposes of rapid optimization, it is expedient if the selected row and / or column is the one in which the maximum illuminance is required in total over its n pixels.
    In a practice-proven variant, it is provided that the desired light image is subdivided into a pixel set with n rows and m columns, in a second step for optimizing the control characteristics according to the desired light distribution for each pixel of the pixel set the required illuminance Eij is set Step, that column / row is selected in which, in total, over whose n pixels the maximum illuminance, namely the sum illuminance of this column c2 / row is required, is calculated in a third step from this sum illuminance, wTel unit of time per illuminance tsix in this column / Row is available on the average, namely tsix = Ts / EC2 tot, where Ts is half the period of the column period / row period and Ec2 tot. the sum of all predefined illuminance values per pixel, which is required in this half period of the column period, means that in a fourth step the illuminances Ec.n of the column / row present in a row can be used to create a new row the illuminance E'c2n of each member of the new row is E c2n = Ec2j, in a fifth step, each member of the new row is multiplied by the time unit per illuminance tu to obtain a new time series that is greater than that available for each pixel is defined as a new optimized control characteristic, and each term of the new time series is multiplied by the deflection angle a :::: amax / n available to each pixel, whereby one for each pixel of the column / row Deflection and thus an optimized control curve receives and in a sixth step, this control characteristic for controlling the M ikrospiegels for each column / row is used.
    In many cases, a sufficiently optimized result is obtained if the remaining axis is controlled with a fixed, non-optimized control characteristic.
    On the other hand, if in a seventh step the utilization of the laser power per pixel is evaluated and the row / column with the best utilization rjmax is determined, it can be advantageous in an eighth step to select those column with the optimum utilization of the installed laser power and the optimization of the control characteristic of the remaining axis is used and was proceeding in steps analogous to the first, second, third and fourth step, starting from the utilization of the installed laser power per pixel, proceeding in that line in which the previously determined highest exploitation of the installed laser power could be made, all utilization of the installed laser power in the respective pixel summed up, in a, ninth step subsequently of the utilization ηΓ2 ges. the time unit per utilization tzi is calculated starting from this line. tzr, - IZ / I] r2 sat. where Tz half the period of the line period and ηΓ2 ges. the sum of all calculated or measured powers of the installed laser power per pixel required in this half period of the line period, in a tenth step the respective utilization values of the line are used to create a new row, the illuminance η r2m of each member of the new one Row to η'Γ2ιη = Σ "-ι böj yields, in an eleventh step, the members of the new row multiplied by the time unit per utilization ίζη and optimized over the, for each pixel available, deflection angle ctn '= öHmax / m as a new Horiontale / vertical control characteristic.
    This results in a particularly well optimized result, if applied in a twelfth step, the optimized control characteristic for the vertical / horizontal and the horizontal / vertical axis and analogous to the seventh step, the exploitation of the installed laser power per pixel is determined.
    It may also be useful in certain cases if the optimization of the control characteristics is performed stepwise in reverse order with respect to the rows and columns or axes, in order to further obtain two optimized control characteristics.
    In this case, it is advisable to make a selection from the total of the optimized control characteristics obtained as a function of the desired illumination image, the most favorable combination being used to control the light scanner.
    The object of the invention is also achieved with a headlamp of the type specified above, in which the arithmetic unit for carrying out the method according to one or more of claims 1 to 8, which have been mentioned above, is set up.
    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
    1 shows the essential components of the invention for a headlight and their relationship in a schematic representation,
    FIG. 2 shows the power distribution on a luminous image generated by a scanning laser beam deflected by a conventional two-axis mirror. FIG.
    3 shows a desired, exemplary light distribution for a headlight,
    4 shows the division of a luminous image in rows and columns,
    5a and 5b a flow chart of two variants of the method according to the invention, Fig. 6 a desired output luminous image,
    7 shows an optimized control characteristic,
    8 shows a diagram of the utilization of the installed laser power after carrying out an optimization method,
    9 shows a further optimized control characteristic,
    10 shows a diagram of the utilization of the installed laser power after carrying out a further optimization method and
    11 shows in another diagram the utilization of the installed laser power after carrying out a further optimization method.
    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 car-Scheinwerter still contains many other parts that allow its meaningful use in a motor vehicle, in particular a car or motorcycle. The lighting starting point of the headlamp is a laser light source 1, which emits a laser beam 2, and which is associated with a laser driver 3, said driver 3 for power supply and for monitoring the laser emission or e.g. is used for temperature control and is also set up to modulate the intensity of the emitted laser beam. By "modulating" in the context of the present invention is meant that the intensity of the 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 angular position at which a mirror described in more detail later stands. In addition, there is still the possibility of switching on and off for a certain time, not to illuminate or hide defined places. An example of a dynamic driving concept for forming an image by a scanning laser beam is approximately in FIG. Document A 514633 of the applicant described.
    The laser light source in practice often contains several laser diodes, for example six of e.g. 1 watt each, to the desired power or the required luminous flux. to reach. The drive signal of the laser light source 1 is denoted by LL.
    The laser driver 3 in turn receives signals from a central processing unit 4, which sensor signals si ... Si ... sn can be supplied. These signals can on the one hand, for example, switching commands for switching from high beam to low beam or on the other hand, signals that are taken, for example, from sensors Si ... Sn, such as cameras, which detect the lighting conditions, environmental conditions and / or objects on the road. Also, the signals may originate from vehicle-vehicle communication information. The mer 4 shown schematically as a block arithmetic unit 4 may be completely or partially contained in the headlight and is also used in particular for carrying out the method of the invention described below.
    The laser light source 1 emits, for example, blue or UV light, wherein the laser light source is followed by a collimator optics 5 and a focusing optics 6. The design of the optics depends, inter alia, on the type, number and spatial placement of the laser diodes used, on the required beam quality and on the desired laser spot size at the Lichtkonversionsmittei.
    The focused or formed laser beam 2 'passes to a light scanner 7 and is reflected by a micromirror 10 onto a light conversion means 8, which in the present example is designed as a light-emitting surface, which is used e.g. has a phosphor for light conversion in a known manner. For example, the phosphor converts blue or UV light into "white" light. In the context of the present invention, "phosphorus" is generally understood to mean a substance or a substance mixture which converts light of one wavelength into light of another wavelength or a wavelength mixture, in particular into "white" light, which is termed "wavelength conversion "subsumable.
    One uses luminescent dyes, wherein the output wavelength is generally shorter and thus more energetic than the emitted wavelength mixture. The desired white light impression is created by additive color mixing. It is under "white
    The term "light" is of course not restricted to radiation visible to the human eye, for example, optoceramics are possible for the light conversion medium, these are transparent ceramics, such as For example, YAG: Ce (an yttrium-aluminum garnet doped with cerium).
    It should be noted at this point that in the drawing, the light conversion means is shown as a phosphor surface on which the scanning laser beam or scanning laser beams produce an image projected from this side of the phosphor. However, it is also possible to use a translucent phosphor in which the laser beam, coming from the side facing away from the projection lens, produces an image, but the emission side is on the projection lens-facing side of the light conversion means. Thus, both reflective and transmissive beam paths are possible, and ultimately a mixture of reflective and trans-missive beam paths is not excluded.
    The micromirror 10 swinging about two axes in the present example was driven by a mirror drive 9 with the aid of drive signals ax, ay and e.g. deflected in two mutually orthogonal directions x, y. The mirror drive 9 is also controlled by the arithmetic unit 4 in order to be able to set the oscillation amplitudes of the micromirror 10 as well as its instantaneous angular velocity, although asymmetric oscillation about the respective axis can also be adjustable. The driving of micromirrors is known and can be done in many ways, e.g. electrostatic, electromagnetic or electrodynamic. In proven embodiments of the invention, the micromirror 10 pivots in the x-direction about a first axis of rotation lOx and in the y-direction about a second axis of rotation lOy and its maximum deflection leads in dependence on its control to deflections in the. resulting luminous image, for example, 35 ° in the x-direction and -12 ° to + 6 ° in the y-direction, wherein the Spiegelauslen-kungen the halves of these values amount.
    The position of the micromirror 10 is expediently reported back to the mirror drive 9 and / or to the arithmetic unit 4 with the aid of a position signal pr. It should be noted that other beam deflecting means, such as e.g. movable prisms, although the use of a micromirror is preferred.
    The laser beam 2 'thus scans across the light conversion means 8, which is generally flat, but need not be flat, and produces a light image 11 with a predetermined light distribution. This light image 11 is now projected onto the roadway 13 with an imaging system 12 as a light image 11 '. In this case, the laser light source is pulsed at high frequency or driven continuously, so according to the position of the micromirror arbitrary light distributions are not only adjustable, for example, high beam / low beam - but are also quickly changeable, if this requires a special terrain or road situation, such as when pedestrians or oncoming vehicles one or more of the sensors si ... sn are detected and accordingly a change in the geometry and / or intensity of the light image 11 'of the road illumination is desired. The imaging system 12 is shown here in simplified form as a lens.
    The term "roadway" is used here for a simplified representation, because of course it depends on the local conditions whether the photograph 11 'is actually located on the roadway or extends beyond it. "In principle, the image 11' corresponds to a projection onto a vertical one Area in accordance with the relevant standards relating to automotive lighting technology.
    Hereinafter, embodiments of the method according to the invention are explained in detail. First, the desired luminous image is divided into a pixel set with n rows and m columns, wherein m :::: 30 and n = 60 in the raster shown in Fig. 4, thus having 30 rows and 60 columns. It should be clear that any other technically acceptable alternative resolution can be chosen here. In the illustrated example, there are at least 30 * 60 :::: 1800 pixel fields.
    It is now determined in which column and in which row there is the pixel for which the highest optical power must be provided, this optical power for each pixel depending on the desired light distribution or on the desired intensity in the respective pixel. The corresponding presets are defined for each pixel as a specific illuminance in ix, and these values are used to calculate the required optical power in watts per pixel, taking into account the efficiency of the optics of the headlamp and, optionally, the efficiency of a light conversion means.
    The invention now provides that the horizontal and / or vertical control characteristic for the micromirror is adapted to a selected row and / or column with regard to the required optical power of the pixels and uses the adapted horizontal and / or vertical control characteristic to control the micromirror becomes. In this case, the most general case is the one in which the micromirror is driven "linearly" with respect to both axes, thus no resonant operation is selected, but it should be understood that the invention is also applicable only to the control with respect to one axis, namely if scanning is only done in one axis, eg with a wide light spot or with several micromirrors, which scan one spot above or next to each other.
    After setting the n rows and m columns as mentioned above, setting the required illuminance Ejj per pixel, and determining the maximum power required per pixel, either the horizontal or vertical control characteristics are adjusted, i. optimized, resulting in two variants. A variant of the invention will first be described in which the vertical control characteristic is optimized, hence that relating to the columns and referred to as "variant 2", with reference to figures 5a and 5b.
    Step v'12:
    In this step, column column c2 is defined in the column in which the previously determined highest optical power must be provided, and the sum illumination intensity of this column c2 is calculated. Fig. 6 shows the desired illumination image in which the column c2 was determined with the maximum illuminance.
    The total illuminance is saturated with EC2. designated.
    Step v22:
    In this following step, it is calculated from this total illuminance, which unit of time per illuminance tsix is available in this column c2. tsix "" -I S / Ec2 ges.
    Here, Ts means half the period of the column period and EC2 tot. the sum of all predefined illuminance values per pixel required in this half period of the column period. Column period is the duration that the mirror requires when pivoting about a (horizontal) axis for scanning in the vertical direction, thus in the column direction.
    Step v32:
    Subsequently, the respective illuminances of column c2 EC2n, which are in a row, are used to create a new row, the illuminance E'c2n of each member of the new row being E c2n = Ec2j.
    Step v42:
    In this following step, the members of the new grater are multiplied by the time unit per column strength tsix and are set above the deflection angle αν '= civmax / n available for each pixel as a new optimized control characteristic which is drawn for an example in FIG is drawn and recognizes the deviation from the dashed line drawn linear control. Ts is half the period of the column period. The abscissa axis represents the time in FIG. 7, the deflection takes place over an entire column period and thus T6 corresponds to half this time.
    Step v52:
    The optimized control characteristic is now applied and for the remaining axis a linear, thus not optimized control is used.
    Step v62:
    In this step, the utilization (for example in% of the laser power per pixel) is evaluated and the line with the best utilization pmax is determined:
    The evaluation can either be done by calculation or determined by measuring.
    If the evaluation is to be carried out by measuring, a corresponding headlamp system is constructed and for each pixel, the utilization of the installed laser power on the luminous flux in the resulting photograph is recalculated. For example, one can measure the luminous flux for each pixel and calculate back to watts per pixel through the efficiency of the light conversion agent (phosphor).
    Mathematically, one must assume the possible achievable optical power of a laser diode in the light image. By way of example, a laser diode IW delivers optical power which, due to the scanning process, is to be divided among the 60 × 30 pixels, for example.
    With a linear control curve, one could thus achieve an optical power of 0.556mW in each pixel in this example.
    In the case of the optimized control curve, this power of 1 W was no longer divided evenly, but distributed at different speeds across the pixels in accordance with the optimized control curve.
    The optical power distribution with a laser diode, for example one watt, resulting from application of the optimized control curve can then be used to calculate the number of laser diodes required for each pixel, namely the required optical power per pixel Pm, n divided by the deliverable one optical power per pixel Pm.n with the optimized control characteristic when using a laser diode with, for example, IW optical power.
    Thus one obtains the necessary number of laser diodes for the respective pixels, which of course is round if the result of the division is not integer.
    The utilization of the installed laser power for each pixel Pm, n is then obtained by dividing the required optical power in pixels Prn, n by the product of the achievable power of a laser diode in pixels Pm, n and the maximum number of laser diodes required in all pixels.
    FIG. 8 illustrates the utilization of the installed laser power in each pixel calculated for a representative example, with a higher utilization corresponding to a higher density of dots in the drawing.
    Step v72:
    Now the column with the optimal utilization of the installed laser power is selected and used for the optimization of the control characteristic of the remaining axis (in this example the horizontal control characteristic).
    The process is basically the same as in the optimization of the vertical control characteristic in the process steps vl2, v22, v32, v42, but now is not based on the illuminance but on the utilization of the installed laser power per pixel.
    In this case, in the line in which the previously determined maximum utilization of the installed laser power could be provided, defined as row r2 and summed all exploitation of the installed laser power in the respective pixel. See also step v82.
    Step v82:
    Subsequently, the utilization η, · . tot., namely the sum of the utilizations in step v72, calculated on the basis of which unit of time per utilization tzi is available in this row r2. tzr, IZ / I] r2 ges. where Tz half the period of the line period and ηΓ2 ges. the sum of all calculated or measured utilizations of the installed laser power per pixel required in this half period of the line period is.
    Step v92:
    In this step, the respective utilization values of row r2 are used to create a new row, with the illuminance η r2m of each member of the new row being η βn, === 1, ¾¾¾.
    Step v102:
    Now, the members of the new series are multiplied by the time unit per utilization tzn and set above the, for each pixel available, deflection angle cm '= ctHmax / m as a new optimized control characteristic for the horizontal control of the micromirror. For the example considered, this characteristic is shown in FIG. 9 as a solid line, the dotted line again corresponds to a linear control without opimization, wherein it can be seen that the deviation of the optimized horizontal control characteristic from the linear curve is only slightly smaller.
    Step v'112:
    Now you have both for the vertical and for the horizontal axis of the micro-scanner or micromirror an optimized control characteristic obtained, which can be applied. In this application, in analogy to step v62, the utilization of the installed laser power is either calculated or measured in a test setup. This utilization is shown in a representation comparable to FIG. 8 in FIG.
    Similarly, the optimization of the control characteristics of the respective axes in the reverse order, which led to a variant of the invention, in which the horizontal control characteristic is optimized, thus those relating to the lines and which is referred to as "variant 1". The ablaut diagram of Fig. 5a and 5b shows this in the steps vll to vlll, with a separate explanation is not required because here compared to the second variant only rows and columns or "horizontal" and vertical "reversed". The line rl with the maximum illuminance in the desired light image can be seen in Fig. 6 already mentioned above.
    First of all, the optimization of the horizontal control characteristic takes place. Step v51 applied and then evaluated in step völ to optimize in the following steps v71 to vlOl the remaining vertical control characteristic. The utilization using the method according to the variant 1 is shown in Fig. 11, wherein in this figure, notwithstanding the representations of Figs. 8 and 10, the percentage of utilization for each pixel is entered in numbers. For the sake of a clear overview
    11, only the "left" half of the illuminated image is shown, for the entire illuminated image the "right" half would have to be supplemented in mirror image form.
    Regardless of whether variant 1 or 2 is used, the laser output is utilized in the important areas of the illuminated image to near 100%.
    Using the methods described above, one obtains different control characteristics which lead to different utilizations of the installed laser power. More specifically, each variant has both an optimized horizontal and an optimized vertical control characteristic. Whichever is better depends on the desired image, resolution, and intensity in each pixel, so it is recommended to compare the results that can be done in the Compare Usage step, but typically the optimized horizontal and The optimized vertical control characteristic of the respective variant in the sense of the best possible total utilization together best.
    Considering the method shown in FIGS. 5a and 5b, it will be appreciated that various combinations or simplifications are possible. Thus, for example, one can use the optimized horizontal control characteristic obtained in variant 1 with the optimized vertical control characteristic obtained in variant 2 and vice versa and determine in a comparison the most favorable combination of the control characteristics for a specific case and then use this combination to control the micromirror.
    In many cases it would not be necessary to apply the said comparison, i. one then carries out only one variant of the method and applies the result obtained without further examination. As already mentioned above, in the case of a headlight whose scan takes place only in one axial direction, the optimization is naturally carried out only in this single axis - corresponding, e.g. of steps v61 to v101 of variant 1.
    权利要求:
    Claims (9)
    [1]
    1. A method for driving a light scanner (7) in a headlight for vehicles, wherein the laser beam of at least one modulated laser light source (1) is scanned by means of the light scanner on a light conversion means (8) to generate a luminous image (11) on this, soft is projected onto the carriageway via an imaging system (12) as a light image (11 '), and a micromirror (10) of the light scanner is swiveled in at least one coordinate direction according to defined control characteristics, characterized in that the desired illumination image (11) is in a pixel set subdivided with n rows and / or m columns, the horizontal and / or the vertical control characteristic for the micromirror (10) is adapted to at least one selected row and / or column with regard to the required optical power of the pixels and the adjusted horizontal and / or the vertical control characteristic is used to control the micromirror.
    [2]
    2. The method according to claim 1, characterized in that the selected row and / or column is the one in which in total over its n pixels, the maximum illuminance is needed.
    [3]
    3. The method of claim 1 and 2, characterized in that the desired light image is divided into a pixel set with n rows and m columns, in a first step to optimize the control characteristics according to the desired light distribution for each pixel of the pixel set the required illuminance Ejj set is selected, in a second step (vl2) that column (r) / row in which in sum over its n pixels the maximum illuminance, namely the sum illuminance of this column c2 / row is required, in a third step (v22) of from this sum illumination intensity, which unit of time per illuminance hx in this column (c2) / row is available on average, namely tsix = Ts / EC2 tot, where Ts is half the period of the column period / row period and Ec2 tot. the sum of all predefined illuminance values per pixel, required in this half period of the column period, means that in a fourth step (v32) the illuminances (EC2n) of the column (c2) / row present in a row are used to form a new row in a fifth step (v42), each limb of the new row is multiplied by the unit time per illuminance tssx in order to obtain a new time series, the illuminance E'C2n of each limb of the new row being E c2tl = Σρι Ec2j , which is determined as the new optimized control characteristic over the deflection angle αν '= avmax / n available for each pixel, and each term of the new time series has been multiplied by the deflection angle a' = amax / n available to each pixel, whereby each pixel of the column / row receives a deflection and thus an optimized control characteristic and in a sixth step (v52) this control rkennlinie used to control the micromirror for each column / row was used.
    [4]
    4. The method according to claim 3, characterized in that the remaining axis is controlled with a fixed, non-optimized control characteristic.
    [5]
    5. The method according to claim 3, characterized in that in a seventh step (v62) the utilization of the laser power per pixel is evaluated and the line / column is determined with the best utilization i] maX. in an eighth step (v72), that column with the optimum utilization of the installed laser power is selected and used for the optimization of the control characteristic of the remaining axis and subsequently in steps analogous to the first (vH), second (v22), third (v32) and fourth (v42) step, proceeding from the utilization of the installed laser power per pixel, wherein in the line (r2), in which the previously determined maximum utilization of the installed laser power could be provided, all exploitation of the installed laser power in the respective Pixel sums up, in a ninth step (v82) Next from exploiting rp . ges. the time unit per utilization tzg in this row (r2) is calculated. tzr, "Tz / Π r2 where Tz is half the period of the line period and ηΓ2 tot. the sum of all calculated or measured utilization of installed laser power per pixel, required in this half period of the line period, in a tenth step (v92) the respective utilization values of the line (r2) are used to create a new row, the illuminance η ..2ο1 of each member of the new series to ηώπι = £ -¾rjr2j, in an eleventh step (λ 102) multiplies the members of the new series by the unit of time per utilization tzi) and over that available for each pixel , Deflection angle cir '= OHmax / m are defined as a new optimized horizontal / vertical control characteristic.
    [6]
    6. The method according to claim 3 and 5, characterized in that in a twelfth step (vll2) applied the optimized control characteristic for the vertical / horizontal and the horizontal / vertical axis and analogous to the seventh step (v62), the utilization of the installed laser power each Pixel is determined.
    [7]
    A method according to claims 3, 5 and 6, characterized in that the optimization of the control characteristics is carried out stepwise (steps vll to v'111) in reverse order with respect to the rows and columns or axes in order to further obtain two optimized control characteristics ,
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that a selection of the total obtained, optimized control characteristics in response to the desired light image, wherein the most favorable combination used to control the light scanner word.
    [9]
    9. Headlamp for vehicles, with at least one modulated laser light source (1) whose laser beam by means of a light scanner (7) is steerable on a light conversion means (8) to generate a luminous image (11) on this, which via an imaging system (12 ) is projected onto the road as a light image (1Γ), and a micromirror (10) of the light scanner can be swiveled in at least one coordinate direction in accordance with defined control characteristics, and with a laser control (3) and a computing unit (4) associated therewith, characterized in that the arithmetic unit (4) is arranged to carry out the method according to one or more of the preceding claims.
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    US20180147978A1|2018-05-31|
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    法律状态:
    2016-11-15| HC| Change of the firm name or firm address|Owner name: ZKW GROUP GMBH, AT Effective date: 20161014 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50339/2015A|AT516848B1|2015-04-27|2015-04-27|Method for driving a light scanner in a headlight for vehicles and headlights|ATA50339/2015A| AT516848B1|2015-04-27|2015-04-27|Method for driving a light scanner in a headlight for vehicles and headlights|
    PCT/AT2016/050055| WO2016172747A1|2015-04-27|2016-03-10|Method for controlling a light scanner in a headlamp for vehicles|
    CN201680037853.XA| CN107787428B|2015-04-27|2016-03-10|Method for controlling an optical scanner in a headlight for a vehicle|
    JP2017556122A| JP6463507B2|2015-04-27|2016-03-10|Method for controlling optical scanner of vehicle projector|
    EP16711510.4A| EP3289282B1|2015-04-27|2016-03-10|Method for controlling a light scanner in a headlamp for vehicles|
    US15/568,154| US10207630B2|2015-04-27|2016-03-10|Method for controlling a light scanner in a headlamp for vehicles|
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