• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    The invention relates in particular to a motor vehicle light device comprising a pixelated light source (322) and an optical system (300) arranged to project a pixelated light beam (360) emitted by the pixelated light source, the optical system comprising a first mirror (M11) arranged to collect and reflect rays of the pixilated light beam emitted by the pixelated light source, a second mirror (M12) arranged to reflect the rays reflected by the first mirror, and a third mirror (M13) arranged to receive the rays reflected by the second mirror and to reflect these received rays so as to correct the field aberrations. The invention provides a projection of a pixelated light beam by an illuminated device of an improved motor vehicle.
    公开号:FR3055980A1
    申请号:FR1658644
    申请日:2016-09-15
    公开日:2018-03-16
    发明作者:Nicolas Lefaudeux；Guillaume THIN；Antoine De Lamberterie；Samira MBATA；Thomas Canonne；Van-Thai HOANG；Francois-Xavier AMIEL；Vincent DuBois
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    The invention relates to the field of projection of a pixelated light beam by a light device of a motor vehicle.
    BACKGROUND
    The projection of a light beam by a motor vehicle light device conventionally makes it possible to illuminate the road with global lighting and thus to increase visibility in the event of darkness, for example at night. This allows safe driving of the vehicle.
    Recent developments in the field of these light devices make it possible to produce a pixelated light beam to achieve this lighting. With such a light beam, the light device can also perform localized lighting functions, for example projecting a pattern onto the scene. Such functions are known in the field of adaptive lighting. For example, glare-free lighting is known, consisting for example of darkening an area corresponding to a vehicle coming from the front so as not to dazzle this other user. There are also known lighting aids driving, for example consisting in over-intensifying the markings on the ground or road signs so that they are more visible to the driver and / or projecting onto the road one or more pieces of information visible to the driver. .
    In this context, there is a need to improve the projection of a pixelated light beam by a light device of a motor vehicle.
    SUMMARY OF THE INVENTION
    For this, a method of projecting a pixelated light beam by a motor vehicle light device is proposed, as well as a motor vehicle light device configured to execute the method.
    The light device comprises a pixelated light source and an optical system arranged to project a pixelated light beam emitted by the pixelated light source. The optical system includes at least three mirrors. The first mirror is arranged to collect and reflect a majority of the rays of the pixelated light beam emitted by the pixelated light source. The second mirror is arranged to reflect the rays reflected by the first mirror. The third mirror is arranged to reflect the rays reflected by the second mirror so as to correct the field aberrations.
    Such a light device improves the projection of a pixelated light beam by a light device of a motor vehicle.
    The light device is part of the technologies for projecting a pixelated light beam. Such a light beam allows, thanks to its pixelated character, to project one or more patterns when desired.
    The architecture with at least three mirrors, at least one of which corrects the aberrations in the field of the optical system, brings it closer to anastigmatic three-mirror telescopes (TMA, acronym of English "Three-mirror anastigmat"). Like the optical system of these TMAs, the optical system is achromatic or at least relatively little chromatic (thanks to the use of mirrors). Also, the optical system can avoid or at least reduce field aberrations.
    For these reasons, compared with the optical systems of the light device of existing motor vehicles, the optical system can make it possible to produce pixelated light beams at high resolution by generating a blur which remains of the order of magnitude of the pixel. This distinguishes the optical system from the optical systems used today in the automotive field which generate a blur of dimension often greater than that of the pixel for high resolutions. The blur indicates the spreading of the points to be projected. When an optical system generates a blur, this reduces the efficiency and the resolution of the light device. This loss of quality is particularly troublesome when it is desired to project fine patterns, with pixels of relatively small size. The proposed optical system therefore makes it possible to obtain an efficient motor vehicle light device for projecting a good quality high resolution pixelated light beam.
    Unlike TMA optical systems whose function is to collect astronomical images, the optical system is suitable not only for projecting a pixelated light beam, but also for projecting a pixelated light beam emitted by the pixelated light source of a device. motor vehicle light. Thus, the projection field (ie the maximum angle of the projected light beam) of the optical system is relatively wide (to be able to illuminate the road adequately) and the dimensions of the optical system relatively small (to be able to be integrated into a light device motor vehicle, which itself must be integrated into a motor vehicle light projector).
    The method of projecting a pixelated light beam by the light device comprises the provision of an instruction for the distribution of illuminations to be produced by the projection of a pixelated light beam. The method also includes determining a distribution of light intensities on the pixelated light source corresponding to the setpoint and compensating for a distortion of the distribution of illuminations by the optical system. The method also comprises the emission by the pixelated light source of a pixelated light beam by the distribution of determined light intensities. And the method includes the projection by the optical system of the pixelated light beam emitted by the light source.
    A computer program is also provided which includes program code instructions for executing the method. The method is executed when said program is executed by a unit for controlling the projection of a pixelated light beam by a motor vehicle light device as above, the light device also comprising the control unit coupled to the source. bright pixelated.
    Such a control unit is also proposed. The control unit includes a processor associated with a memory that has saved the program.
    A motor vehicle light projector is also proposed, comprising a light device as above.
    According to different embodiments, any combination of at least one of the following characteristics can be implemented:
    the first mirror is arranged to collect and directly reflect a majority of the rays of the pixelated light beam emitted by the pixelated light source; in other words, the first mirror directly receives the rays of the pixelated light beam emitted by the pixelated light source and reflects them, without an intermediate optical element being interposed between the pixelated light source and the first mirror;
    the first mirror is arranged to collect and indirectly reflect a majority of the rays of the pixelated light beam emitted by the pixelated light source, that is to say an optical element is interposed between the pixelated light source and the first mirror, without that this changes the collection role of the first mirror;
    the second mirror is arranged to reflect directly or indirectly the rays reflected by the first mirror; the third mirror is arranged to reflect directly or indirectly the rays reflected by the second mirror;
    the third mirror is also arranged to collimate and project the pixelated light beam;
    the light device further comprises an optical means arranged to receive the rays reflected by the third mirror and to collimate and project the pixelated light beam;
    the second mirror is arranged substantially in the pupil position;
    at least one of the mirrors is off-axis;
    at least one of the mirrors is free-form;
    at least two of the mirrors or all the mirrors are free-form;
    the optical system has a hollow architecture;
    the optical system has a monolithic architecture;
    the optical system forms a single solid part, for example made of a block of transparent material;
    the optical system comprises an inlet face and an outlet face; the optical system further comprises at least three other faces forming the first, second and third mirrors;
    the exit face ensures or participates in collimation;
    the input face and / or the output face is arranged to correct the field aberrations;
    the optical system has at least one of the following characteristics (for example all of the following characteristics): a height of projection field greater than 10 °, a width of projection field greater than 40 °, a power of collection (f / D) less than 3, a resolving power lower than 0.5 ° (ie angle value greater than 0.5 °), at least in an area in the center of the projection field, and / or a larger dimension less than 300 millimeters; and / or the light device further comprises a control unit comprising a processor associated with a memory having recorded a computer program comprising program code instructions for the execution of a method comprising: the supply of a setpoint distribution of illuminations to be achieved by the projection of pixelated light beam; determining a distribution of light intensities on the pixelated light source corresponding to the setpoint and compensating for a distortion of the distribution of illuminations by the optical system; the emission by the pixelated light source of a pixelated light beam by the distribution of determined light intensities; and the projection by the optical system of the pixelated light beam emitted by the light source.
    BRIEF DESCRIPTION OF THE FIGURES
    Different embodiments of the invention will now be described, by way of non-limiting examples, with reference to the appended drawings in which:
    FIGs. 1-2 illustrate a prior art TMA optical system;
    FIGs. 3-5 show examples of the optical system;
    FIG. 6 shows the result of simulations;
    FIG. 7 shows a diagram illustrating an example of the process;
    FIG. 8 illustrates the process;
    FIG. 9 shows a schematic example of a light module comprising a pixelated light source; and
    FIG. 10 shows a schematic example of the projection of a pixelated light beam by a vehicle.
    DETAILED DESCRIPTION
    FIG. 1 shows an optical system 102 of TMA type telescope of the prior art. FIG. 2 schematically illustrates the operation of the optical system 102.
    According to this operation, a first mirror M1 is arranged to collect and reflect rays 104 of the light beam emitted by a celestial object and to correct the field aberrations. The rays 104 are parallel due to the distance from the celestial object. A second mirror M2 is arranged to reflect the rays 106 reflected by the first mirror Ml. A third mirror M3 is arranged to receive the rays 108 reflected by the second mirror M2 and to project the rays 110 resulting on a focal plane matrix FPA (acronym of English “Focal Plane Array”) which makes it possible to view and / or record the image. The field of vision of the optical system 102 is rectangular and relatively narrow and the dimensioning of the optical system 102 is relatively large. But thanks to its architecture (in particular by the correction of field aberrations by the first mirror M1), the resolving power of the optical system 102 is particularly great. Thus, the optical system 102 is well suited for observing celestial objects with a telescope. Document US 2012038812 A describes an example of an optical system having this operation.
    The proposed optical system has architectural similarities with the optical system 102. In particular, it too forms a system with several mirrors which can be anastigmatic (at least to some extent) with an arrangement and configuration of mirrors (shape and surface properties) adequate and well known in the field of TMA. Mirrors are reflective surfaces, also called "reflectors". Thus, the optical system makes it possible to obtain a very great resolving power.
    The resolving power for an optical system of a motor vehicle light device which projects a pixelated light beam designates the minimum angle which must separate two contiguous points in order for them to be discernible. Thus, the resolving power of an optical system corresponds to the finest resolution which can be used to embed detailed patterns in a pixelated light beam which one wishes to discern. Below the resolving power, the detailed reason is not discernible. Thus, with an optical system having a high resolution power, a vehicle light device projecting a pixelated light beam emitted by a pixelated light source can take full advantage of all the fineness of resolution provided by the pixelated light source. The proposed optical system allows therefore take advantage of a high resolution pixelated light source, for example which comprises more than 1000 pixels or more than 10,000 pixels.
    Unlike the optical system 102, the proposed optical system does not include FPA. In the overall arrangement of the light device, the FPA is replaced by a pixelated light source which emits a pixelated light beam (eg, not parallel). Therefore, the proposed optical system operates in reverse of the optical system of the prior art. With reference to FIG. 2, the first mirror encountered by the rays of the pixelated light beam corresponds to M3 in the optical system 102. This first mirror collects and reflects these rays towards a second mirror which corresponds M2. The second mirror then reflects the rays towards a third mirror which corresponds to M1 and which corrects the field aberrations.
    Various examples of characteristics of the proposed optical system are now discussed.
    The third mirror can be arranged to collimate and project the pixelated light beam, for example on the road. Alternatively, the light device may further comprise an optical means arranged to receive the rays reflected by the third mirror and to collimate and project the pixelated light beam. The optical means can, for example, directly receive the rays coming from the third mirror (without an intermediate element). In these cases, the optical system can comprise exactly three and not more than three mirrors, as for the optical systems of TMA. Its manufacture is therefore relatively simple. Alternatively, the optical system may include one or more other mirrors, for example a fourth or a fifth mirror.
    The first mirror can be arranged to collect a majority of the rays of the pixelated light beam emitted by the pixelated light source. This allows a high efficiency of the light device. The pixelated light beam emitted by the pixelated light source may have the shape of a cone. The first mirror can be arranged in a suitable manner. The first mirror can be concave.
    The first mirror can produce the majority of the optical power of the optical system, for example most of the optical power. The first mirror can be arranged to participate in the correction of field aberrations (with the third mirror). The first mirror can also participate in the correction of spherical aberrations.
    The position and shape of the second mirror can be configured to receive all the rays emitted by the pixelated light source which are reflected by the first mirror and to redirect these rays to the third mirror, regardless of their angle of emission. This optimizes the efficiency of the light device.
    The second mirror can be arranged substantially in the pupil position. The pupil position corresponds to the telecentrism of the light rays at the level of the pixelated light source. This optimizes the efficiency of the light device.
    At least one mirror can be off-axis. For example, all mirrors can be off-axis. The use of off-axis mirrors makes it possible to avoid obscuring part of the rays by the folding mirror and to improve the transmission of the system.
    At least one of the mirrors can be free-form. For example, all the mirrors are free-form. A free-form mirror is a mirror having a surface-free type profile, that is to say without an axis of symmetry of revolution. This distinguishes it from spherical type mirrors but also from so-called aspheric type mirrors used in conventional TMA, that is to say different from the shape of a sphere but constituting at least a portion of a shape with symmetry of revolution. For a system with a high collection power and a large field, the use of free surfaces makes it possible to obtain the best performance in terms of resolution power, field of projection and compactness of the system.
    The motor vehicle can be any type of land vehicle, for example an automobile (car), a motorcycle, or a truck. The vehicle can be equipped with one or more front headlamp (s) and / or one or more rear headlamp (s). One or more of the front and / or rear headlights may each include one or more light device (s) each configured to project a pixelated light beam. The projection of a pixelated light beam is of particular interest when carried out by a front headlight light device.
    For a given light device, the projection can be done on a stage. The scene or "road scene" is the environment of the vehicle capable of being illuminated by the light device.
    A pixelated light beam is in known manner a light beam subdivided into elementary light sub-beams called "pixels". The subdivision can be any, for example forming a grid having a dimension in ίο azimuth and a dimension in depth (or distance) relative to the position of the vehicle. Each pixel is individually controllable by the light device to a extent allowing at least one pattern to be projected onto the scene. A pattern is a localized area of the scene for which the value of the light intensity deviates from the nominal value and creates a localized contrast in the scene. A pattern can be distinguished or not distinguishable with the naked eye.
    Each pixel of the pixelated light beam is projected onto a corresponding area of the scene, also called a “pixel”. The light device can individually control the light intensity of the source of each pixel of the pixelated light beam, thereby individually controlling the illumination of each pixel in the scene. The light device can divide the scene into more than 10 pixels, more than 50 pixels, or, for a projection implementing advanced functions, more than 500 pixels (for example of the order of 1000 pixels or more than 1000 pixels). The pixelated light beam can for example darken one or more groups of one or more pixels, and / or over-illuminate one or more groups of one or more pixels with respect to a current light intensity value, for example the nominal value. A pixel darkening is a decrease at a given instant in the illumination in the pixel. It should therefore be noted that the darkening of a pixel does not necessarily imply stopping the lighting of the pixel. A pixel over-illumination is an increase at a given moment in the illumination in the pixel. The contrast of the pattern with respect to its periphery can therefore be positive or negative. The resolution of a pattern can be of the order of a pixel. The size of the pattern can be less than 25% or 10% of the total pixels of the scene.
    The size of the pattern can be equal to or greater than one pixel. For a given pattern projected at a given time, one or more pixels of the scene - or equivalent of the light beam - correspond to the pattern. A distribution of one or more light intensity (s) respective to the pattern is thus associated with each pixel and forms the pattern. A method can therefore project the pattern into an area of the scene by providing the light device with a light intensity instruction which corresponds to the pattern, for each pixel concerned in the scene. The light intensity setpoint can be any data structure relating to the light intensity, for example a light intensity value to be applied for the center of the pixel, a spatial and / or temporal distribution of values to be applied for the same pixel. , and / or data indirectly linked to the light intensity and which can be translated into light intensity (such as, for example, data relating to the illumination in the pixel). When the set point is respected for all the pixels corresponding to the pattern, the pattern is fully projected onto the scene. Several patterns can be projected simultaneously, with or without spatial overlap. The case of spatial overlap can be handled anyway. For example, one pattern can take precedence over another. Alternatively, the light device can be configured to find a compromise in the illuminations to be applied to a pixel included in the overlap.
    Projecting the pattern can improve a driving situation. A driving situation can correspond to a set of driving parameters, for example including environmental and / or architectural parameters relating to the road, system parameters of the vehicle and / or other vehicles, and / or parameters relating to the road condition. The improvement may consist of a projection of the pattern increasing the comfort and / or helping the driver of the vehicle projecting the pattern and / or other users (for example another driver of one or more other vehicle (s) and / or one or more pedestrians). Projecting the pattern can accomplish this improvement by performing one or more of the following functions: an information projection function created for the driver and / or other users, a highlighting or highlighting function of object (s) in the scene, and / or a function of not dazzling any person (for example of one or more other users). Such a pattern makes it easier to drive and / or increases safety, from the point of view of the transmitting vehicle and / or other vehicles in circulation at the time when the pattern is projected.
    A pattern can have the function of avoiding the glare of another user or of the driver by darkening an area of the scene corresponding to this other user and / or to a reflective panel. Thanks to this, the light device can for example operate continuously in high beam, the light device ensuring darkening as soon as another vehicle comes from the front. This ensures high driving comfort and visibility and therefore increases safety.
    A pattern can form an image projected on the ground, for example on the road. An image is a pattern that is visible, that is to say, distinguishable, for example by the driver and / or other users. The image can have one or more of the following functions: over-intensify ground markings (for example lines and / or arrows, for example by over-illumination so as to allow their contrast and therefore their visibility to be increased ); highlight a side of the road taken by the vehicle; create a representation bounding the route (for example when a marking is absent); create a marking corresponding to the size of the vehicle (which makes it possible to identify the trajectory of the vehicle - by possibly integrating the steering wheel angle - thus forming an equivalent at the front of the reversing cameras); and / or display one or more pieces of information of any type offering assistance to the driver (for example concerning safety, dangers, or even data related to driving, such as speed or direction).
    The pattern can correspond, for example, to a localized area that is more lit than the rest of the scene around, and / or to a localized area that is less lit than the rest of the scene around or not at all lit. If the localized area is on the road itself, the pattern can correspond to a localized lit area. This allows the driver to continue to see the road even in the area and thus maintains driving safety. If the motif is for the attention of the driver of the vehicle, the motif may correspond to a localized area which is more illuminated than the rest of the scene. This allows greater visibility for the driver. Also, an outline of the pattern can be darkened. This further increases the contrast and therefore the visibility of the pattern. The pattern can for example form an image projected on the road for the attention of the driver of the vehicle. In this case, a positive contrast of the pattern with respect to its periphery allows a particularly good visualization. In another example, the pattern may correspond to another vehicle (automobile or not), for example coming from the front. In this case, the pattern can correspond to the location occupied by this other vehicle in the scene. Darkening implying a negative contrast of the pattern with respect to its circumference makes it possible not to dazzle this other user and thus to secure the road. Similarly, the pattern may correspond to the location occupied by a panel or other reflecting object. A darkening of this panel avoids reflections and therefore the glare of the driver and / or other users.
    A pixelated light beam can be projected by a light device comprising a pixelated light source. The light source may be able to cooperate with an optical system (integrated into the device or not) arranged to project onto the road a pixelated light beam emitted by the pixelated light source. The method may include projecting the pixelated light beam with such a light device. The same pixelated light source can emit the overall lighting and the image. A pixelated light source is a light source divided into several units of individually controllable light sources. Each pixel emitted by the pixelated light source, and therefore each light source unit, can correspond to one pixel of the projected pixelized light beam. Thus, the light intensity of each pixel of the pixelated light source and therefore the illumination of each pixel of the scene can be controlled individually. The pixelated light source can have more than 1000 pixels. The light device can thus project patterns in high resolution.
    The pixelated light source may include a matrix of light source units. The matrix can include a multitude of pixels in a plane. In the case of a light source comprising a matrix of pixels and cooperating with an optical system, the optical system may have a focusing zone coincident with the plane of the pixel matrix, that is to say coincident with the source bright pixelated.
    The pixelated light source can be of the DMD (English acronym for “Digital Mirror Device”) type where the rotation modulation of micro-mirrors makes it possible to obtain a desired light intensity in a given direction. The pixelated light source can be of the LCD type (acronym for “Liquid Crystal Displays”) comprising a surface light source in front of which liquid crystals are placed. The movement of liquid crystals can allow or prohibit the passage of light and thus form a pixelated light beam. The pixelated light source can be of the laser type sending a beam of light rays to a scanning system which distributes it over the surface of a wavelength conversion device, such as a plate comprising a phosphor.
    The pixelated light source can be an electroluminescent source. An electroluminescent source is a solid-state light source which comprises at least one electroluminescent element. Examples of the light emitting element include the light emitting diode (LED), the organic light emitting diode (OLED), or the polymeric light emitting diode or PLED (English acronym for "Polymer Light-Emitting Diode"). The pixelated light source can be a semiconductor light source. Each electroluminescent element or group of electroluminescent elements can form a pixel and can emit light when its or their material is supplied with electricity. The electroluminescent elements may each be semiconductor, that is to say that they each comprise at least one semiconductor material. The light-emitting elements can be predominantly made of semiconductor material. We can therefore speak of a light pixel when an electroluminescent element or group of electroluminescent elements forming a pixel of the pixelated light source emits light. The electroluminescent elements can be located on the same substrate, for example deposited on the substrate or obtained by growth and extend from the substrate. The substrate can be predominantly made of semiconductor material. The substrate may include one or more other materials, for example non-semiconductors.
    The pixelated light source may be a monolithic semiconductor electroluminescent. The source can for example be a monolithic matrix of pixels. The light source can for example be a monolithic array of LEDs (translation of the English term "monolithic array of LEDs"). A monolithic matrix comprises at least 50 electroluminescent elements located on the same substrate (for example on the same face of the substrate), for example more than 100, 1000 or thousands. The substrate may include sapphire and / or silicon. The pixels of the monolithic matrix can be separated from each other by lines (called “lanes” in English) or streets (called “streets” in English). The monolithic matrix can therefore form a grid of pixels. A monolithic source is a source with a high density of pixels. The pixel density can be greater than or equal to 400 pixels per square centimeter (cm 2 ). In other words, the distance between the center of a first pixel and the center of a second pixel near the first may be equal to or less than 500 micrometers (pm). This distance is also called "pixel pitch" in English.
    In a first configuration, corresponding in particular to the case of a monolithic matrix of LEDs, each of the electroluminescent elements of the matrix may be electrically independent of the others and may or may not emit light independently of the other elements of the matrix. Each electroluminescent element can thus form a pixel. Such a light source achieves a relatively simple high resolution.
    In a second configuration, the electroluminescent elements have a general form of "rods", for example of submillimetric dimensions. The rods can each extend orthogonally to the substrate, have a generally cylindrical shape, in particular of polygonal section, have a diameter between 0.5 pm and 2.0 pm, preferably 1 pm, have a height between 1 pm and 10 pm, preferably 8 pm , and / or have a luminance of at least 60 Cd / mm 2 , preferably at least 80 Cd / mm 2 . The distance between two immediately adjacent rods can be between 3 μm and 10 μm and / or constant or variable. The rods can be arranged to emit light rays along the rod (that is to say along a direction perpendicular to a majority plane of extension of the substrate) and at the end thereof. The semiconductor material may include silicon. The electroluminescent elements are distributed in different light emission zones which can be activated selectively, each pixel thus being formed by a zone which can be activated selectively. Such a pixelated light source has advantages of size and lifespan, and of achieving very high resolutions.
    The pixelated light source can be coupled to a light emission control unit of the pixelated light source. The control unit can thus control (control) the generation (for example the emission) and / or the projection of a pixelated light beam by the light device. The control unit can be integrated into the lighting device. The control unit can be mounted on the light source, the assembly thus forming a light module. The control unit can comprise a processor (or CPU acronym from the English “Central Processing Unit”, literally “central processing unit”) which is coupled with a memory on which is stored a computer program which comprises instructions allowing the processor to perform steps generating signals allowing the control of the light source so as to execute the method. The control unit can thus for example individually control the light emission of each pixel of a pixelated light source.
    The control unit can form an electronic device capable of controlling electroluminescent elements. The control unit can be an integrated circuit. An integrated circuit, also called an electronic chip, is an electronic component reproducing one or more electronic functions and can integrate several types of basic electronic components, for example in a reduced volume (i.e. on a small plate). This makes the circuit easy to implement. The integrated circuit can for example be an ASIC or an ASSP. An ASIC (acronym for "Application-Specific Integrated Circuit") is an integrated circuit developed for at least one specific application (that is to say for a client). An ASIC is therefore a specialized integrated circuit (micro-electronics). In general, it brings together a large number of unique or tailor-made functionalities. An ASSP (acronym for “Application Specifies Standard Product”) is an integrated electronic circuit (microelectronics) grouping together a large number of functions to satisfy a generally standardized application. An ASIC is designed for a more specific (specific) need than an ASSP. The supply of electricity to the electroluminescent source, and therefore to the electroluminescent elements is carried out via the electronic device, itself supplied with electricity using for example using at least one connector connecting it to a source of electricity. The electronic device then supplies the electroluminescent elements with electricity. The electronic device is thus able to control the electroluminescent elements.
    Different examples of the optical system are now discussed with reference to FIGs. 3-5.
    The optical systems 300,400 of the examples each include a first mirror Mil arranged to collect and reflect rays of the pixelated light beam emitted by the pixelated light source, a second mirror M12 arranged to reflect the rays reflected by the first mirror, and a third mirror M13 arranged to receive the rays reflected by the second mirror and to reflect these rays so as to correct the field aberrations. In these examples, the second mirror M12 is arranged substantially in the pupil position and receives all the rays reflected by the first mirror Mil. The first Mil mirror, the second M12 mirror and the third M13 mirror are free-form. The first mirror is concave Mil. In these examples, the optical system does not include any other mirror. The discussions which follow however also apply in other cases, in particular in the case where the optical system comprises one or more other mirror (s).
    In a first configuration shown in FIG. 3, the optical system 300 has a hollow architecture. In the example, Mil, M12 and M13 are all separated. Alternatively, a single hollow structure could be provided. Each group or each mirror can be maintained in the light device independently of the others, by means not illustrated in the figure. Such a hollow architecture makes it possible to have a light optical system 300. Mil is arranged to collect and reflect rays of the pixelated light beam emitted by the pixelated light source 322. The structure of the optical system being open, no shutter element obstructs this collection. M12 arranged to reflect the rays reflected by Mil and M13 is arranged to receive these rays, to make a collimation and to project the pixelated light beam 360. The third mirror M13 is arranged to make a collimation of the pixelized light beam 360 and to project it on the road .
    In a second configuration shown in perspective in FIG. 4 and along a vertical plane of symmetry in FIG. 5, the optical system 400 on the contrary has a monolithic architecture. The Mil, M12 and M13 mirrors form a single piece 402, that is to say a single piece. This makes it possible to avoid the adjustments of the mirrors between them, and thus to have an initial adjustment (for example, a factory setting) which remains stable.
    The single piece 402 can be made of a transparent material provided with aluminized reflection faces forming one, several or all of the Mil, M12 and M13 mirrors. This allows simple manufacture, since it does not have to take account of the arrangement of walls of 402 hindering the circulation of light rays. Manufacturing may have as manufacturing constraint only the arrangement of the aluminized reflection faces forming the mirrors Mil, M12 and M13.
    In this second configuration, the optical system 400 comprises an input face 582 and an output face 584. The pixelated light beam emitted by the pixelated light source 522 enters through the input face 582, follows the reflections of the mirrors Mil, M12, and M13 and the exit face 584 collimates the rays and projects the pixelated light beam on the road. The input face 582 and the output face 584 can either one or both be arranged to correct the field aberrations. This improves overall performance.
    An optical system suitable for a motor vehicle light device can be designed according to any of the examples and / or any of the configurations described above, for example based on well-known designs in the field of TMA ( for example as described in the document US 2012038812 A cited above), taking as constraints the following specifications of the optical system: a height of field of projection (ie maximum angle of the pixelated light beam projected in a vertical plane) greater than 10 ° (for example +/- 5 °, the symbol “+/-” being respective to the central direction), a projection field width (ie maximum angle of the pixelated light beam projected in a horizontal plane) greater than 40 ° (by example +/- 20 °), a collection power (that is to say an f / D) of less than 3, a resolution power lower than 0.5 ° (at least in an area in the center of the field projection), and a larger dimension (ie a di size mension) of the optical system less than 300 millimeters. The largest dimension may be the length of the smallest theoretical parallelepiped containing the optical system (for example the height H for the optical system 400 of FIG. 5).
    This makes it possible to obtain an optical system which has an adequate size to be able to be integrated into a motor vehicle light device and which ensures a good quality of projection of a pixelated light beam emitted by a pixelated light source of the light device, even when the pixelated source is high resolution and the light beam contains details making full use of the maximum resolution. Indeed, a resolution power lower than 0.5 ° and an f / D less than 3 are relatively high specifications compared to optical systems of TMA but sufficiently good for the intended application. The fact that the specifications are not more restrictive makes it possible to respect the constraints of dimension and field of projection of the intended application.
    We can further improve the quality by adding one or more of the following constraints: a projection field height of the order of or greater than +/- 15 °, a projection field width of the order of or greater at +/- 40 °, a resolving power greater than 0.15 ° for the entire projection field, a resolving power greater than or on the order of 0.08 ° in an area in the center of the projection field, an f / D on the order of 0.8, and / or dimensions on the order of 100 x 100 x 250 millimeters.
    For comparison, the optical system 102 of the TMA of FIG. 1 can have: a field of vision of +/- 0.85 ° in width and +/- 0.3 ° in height, a resolving power of the order of 0.00005 °, an f / D of l 'order of 24, and to meet these constraints a larger dimension of several meters. Consequently, this dimensioning of TMA is unsuitable for the projection of pixelated light beam by a light device in the automotive context.
    FIG. 6 shows simulations carried out on the basis of the above specifications. For each result, a geometric ray throw represents the performance of the optical system. As can be seen, the resolution of the projected image is of the order of 2 milli-rad = 0.1 ° for a total field of 0.45rad x 1.4rad = 25 ° x80 °. This shows that the proposed optical system is well suited for projecting a high resolution pixelated light beam.
    The results of FIG. 6 also make it possible to observe that the optical system can exhibit distortion aberrations (sometimes of the order of 30%). Not being associated with a blurring but a distortion of the image, this aberration can be compensated digitally (even when it is for example of the order of 30%) by modifying the shape of the pattern to be projected emitted by the source.
    FIG. 7 shows an example of a pixelated light beam projection method by a light device as described above which makes it possible to make this digital compensation.
    The method includes providing S10 with a distribution instruction (ie a map) of illuminations to be produced by the projection of pixelated light beam. In other words. The pixelated source control unit is ordered, for example, to emit a light beam which will achieve the desired spatial and / or temporal distribution on the scene of illumination values.
    The method then comprises, for example by the control unit, the determination of a distribution of light intensities on the pixelated light source corresponding to the setpoint and compensating for a distortion of the distribution of illuminations by the optical system. In other words, the control unit determines which distribution of spatial and / or temporal light intensities (on the pixelated source) it must control in order to comply with the command for distribution of illuminations on the scene. But instead of doing this by calculating a perfect inverse of the projection of a light pixel, the control unit takes into account the distortion of the optical system in the calculation. In particular, to establish the correspondence between a pixel of the scene and a pixel of the light source, the control unit integrates one or more distortion parameters. For example, the method may include using nominal distortion of the optical system and producing opposite deformation. This compensation is illustrated in FIG. 8 which shows the projection 804 of a rectangular grid of pixels of a scene on a pixelated light source 822 without taking into account the distortion. Taking into account the projection, the control unit calculates that the light intensity distribution 802 must be controlled rather than a distribution corresponding to the projection 804.
    The control unit can then control the emission S30 by the pixelated light source of a pixelated light beam according to the distribution of light intensities determined. And thus, the optical system projects S40 the pixelated light beam emitted by the light source, with a distortion which was provided for in the calculations and which therefore leads to the correct image.
    FIG. 9 shows a schematic example of a light module comprising a pixelated light source. The light device can include such a light module. The light module 20 comprises the high density monolithic electroluminescent source 22, a printed circuit or PCB 25 (from the English "Printed Circuit Board") which supports the source 22 and a control unit 27 which controls the electroluminescent elements of the source luminous monolithic 22. Any support other than a PCB can be considered. The control unit Y1 can be at any other place, even outside the light module 20. The control unit 27 is represented in the form of an ASIC, but other types of control unit can implement the functions of the light module.
    FIG. 10 shows a schematic example of projection of a pixelated light beam by a vehicle, seen in perspective. The motor vehicle 1 is provided with two projectors 4 which can each or each include at least one light device 7 configured to each project a pixelated light beam
    10 on a scene 5 located in front of the vehicle 1. The pixelated light beam 10 is in the example configured to form a global lighting 6. The global lighting 6 can be regulatory. The pixelated light beam 10 is also configured to form the pattern 9. The illumination of the pattern 9 is also regulatory. In the example, it is higher than the illumination of the first portion 9 around it, which makes it visible by positive contrast. The motif 9 is in the example an image containing textual and symbolic information for driving assistance. Image 9 relates in particular to the vehicle speed. The light device 7 can alternatively project signaling information or even guidance information for the driver of the vehicle 1. The device 7 can also in other examples project other patterns.
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    1. Motor vehicle light device (7) (1) comprising a pixelated light source (22, 322, 522, 822) and an optical system (300, 400) arranged to project a pixelated light beam (10, 360, 460) emitted by the pixelated light source, the optical system comprising:
    - a first mirror (Mil) arranged to collect and reflect rays of the pixelated light beam emitted by the pixelated light source,
    - a second mirror (M12) arranged to reflect the rays reflected by the first mirror, and
    - a third mirror (M13) arranged to reflect the rays reflected by the second mirror so as to correct the field aberrations.
    [2" id="c-fr-0002]
    2. A light device according to claim 1, in which the third mirror (M13) is also arranged to collimate and project the pixelated light beam.
    [3" id="c-fr-0003]
    3. Light device according to claim 1, wherein the light device further comprises an optical means arranged to receive the rays reflected by the third mirror and to collimate and project the pixelated light beam.
    [4" id="c-fr-0004]
    4. Light device according to claim 1, 2 or 3, wherein the second mirror (M12) is arranged substantially in the pupil position.
    [5" id="c-fr-0005]
    5. Light device according to any one of claims 1 to 4, in which at least one of the mirrors (Mil, M12, M13) is off-axis.
    [6" id="c-fr-0006]
    6. Lighting device according to claims, in which at least one of the mirrors (Mil, M12, M13) is of free shape.
    [7" id="c-fr-0007]
    7. Light device according to any one of claims 1 to 6, wherein the optical system (300) has a hollow architecture.
    [8" id="c-fr-0008]
    8. Light device according to any one of claims 1 to 7, wherein the optical system (400) has a monolithic architecture.
    [9" id="c-fr-0009]
    9 Light device according to claim 8, wherein the optical system comprises an inlet face (582) and an outlet face (584).
    [10" id="c-fr-0010]
    10. Light device according to claim 9, in which the input face (582) and / or the output face (584) is arranged to correct the field aberrations.
    [11" id="c-fr-0011]
    11. Luminous device according to any one of claims 1 to 10, in which the optical system has at least one of the following characteristics:
    - a projection field height greater than 10 °,
    - a projection field width greater than 40 °,
    - a collection power (f / D) less than 3,
    - a resolution power lower than 0.5 °, at least in an area in the center of the projection field, and / or
    - a larger dimension (H) less than 300 millimeters.
    [12" id="c-fr-0012]
    12. Luminous device according to any one of claims 1 to 11, further comprising a control unit (25) comprising a processor associated with a memory having recorded a computer program comprising program code instructions for execution a process comprising:
    - the supply (S10) of a lighting distribution instruction to be produced by the projection of pixelated light beam;
    - determining (S20) a distribution of light intensities on the pixelated light source corresponding to the setpoint and compensating for a distortion of the distribution of illuminations by the optical system;
    - The emission (S30) by the pixelated light source of a pixelated light beam by the distribution of determined light intensities; and
    - the projection (S40) by the optical system of the pixelated light beam emitted by the light source.
    [13" id="c-fr-0013]
    13. A method of projecting a pixelated light beam by a light device according to any one of claims 1 to 12, the method comprising:
    - the supply (S10) of a lighting distribution instruction to be produced by the projection of pixelated light beam;
    - determining a distribution of light intensities on the pixelated light source corresponding to the setpoint and compensating for a distortion of the distribution of illuminations by the optical system;
    - The emission by the pixelated light source of a pixelated light beam by the distribution of determined light intensities; and
    - the projection by the optical system of the pixelated light beam emitted by the light source.
    [14" id="c-fr-0014]
    14. Computer program comprising program code instructions for the execution of the method according to claim 13 when said program is executed by a control unit for projecting a pixelated light beam by a motor vehicle light device comprising a pixelated light source, the control unit coupled to the pixelated light source, and an optical system arranged to project a pixelated light beam (10) emitted by the pixelated light source.
    [15" id="c-fr-0015]
    15. Motor vehicle light projector (4) comprising a light device according to any one of claims 1 to 12.
    1/4
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    同族专利:
    公开号 | 公开日
    WO2018050594A1|2018-03-22|
    JP6942795B2|2021-09-29|
    EP3513234A1|2019-07-24|
    JP2019530158A|2019-10-17|
    FR3055980B1|2019-06-28|
    CN109716196A|2019-05-03|
    US20190264885A1|2019-08-29|
    US11028992B2|2021-06-08|
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    法律状态:
    2017-09-29| PLFP| Fee payment|Year of fee payment: 2 |
    2018-03-16| PLSC| Search report ready|Effective date: 20180316 |
    2018-09-28| PLFP| Fee payment|Year of fee payment: 3 |
    2019-09-30| PLFP| Fee payment|Year of fee payment: 4 |
    2020-09-30| PLFP| Fee payment|Year of fee payment: 5 |
    2021-09-30| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1658644|2016-09-15|
    FR1658644A|FR3055980B1|2016-09-15|2016-09-15|OPTICAL SYSTEM FOR PIXELIZED LIGHT BEAM|FR1658644A| FR3055980B1|2016-09-15|2016-09-15|OPTICAL SYSTEM FOR PIXELIZED LIGHT BEAM|
    EP17764602.3A| EP3513234A1|2016-09-15|2017-09-11|Optical system for a pixelized light beam|
    US16/333,921| US11028992B2|2016-09-15|2017-09-11|Optical system for a pixelized light beam|
    JP2019514259A| JP6942795B2|2016-09-15|2017-09-11|Optical system for pixelated rays|
    CN201780057017.2A| CN109716196A|2016-09-15|2017-09-11|Optical system for pixelation light beam|
    PCT/EP2017/072741| WO2018050594A1|2016-09-15|2017-09-11|Optical system for a pixelized light beam|
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