EP3382266A1 - Device for projecting a light beam with mechanical actuator, optical module and headlight provided with such a device - Google Patents

Device for projecting a light beam with mechanical actuator, optical module and headlight provided with such a device Download PDF

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Publication number
EP3382266A1
EP3382266A1 EP18163462.7A EP18163462A EP3382266A1 EP 3382266 A1 EP3382266 A1 EP 3382266A1 EP 18163462 A EP18163462 A EP 18163462A EP 3382266 A1 EP3382266 A1 EP 3382266A1
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EP
European Patent Office
Prior art keywords
light beam
light
mechanical actuator
angle
displacement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18163462.7A
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German (de)
French (fr)
Other versions
EP3382266B1 (en
Inventor
Marine Courcier
Benoit Reiss
Jean-Paul Ravier
Vanesa Sanchez
Baptiste BOUISSOU
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Valeo Vision SAS
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Valeo Vision SAS
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Publication of EP3382266A1 publication Critical patent/EP3382266A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/657—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by moving light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/63—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates
    • F21S41/635—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by moving refractors, filters or transparent cover plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a light beam projection device with mechanical actuator, in particular for a motor vehicle, an optical module and a beam light projector, of the low beam or high beam type, provided with such a projection device.
  • an optical module of the housing notably comprises a light source, for example one (or more) electroluminescent diode (s), which emits light rays, and an optical system comprising one or more lenses and, optionally an optical element, for example a reflector, for orienting the light rays from the light sources, to form the output light beam of the optical module.
  • a light source for example one (or more) electroluminescent diode (s), which emits light rays
  • an optical system comprising one or more lenses and, optionally an optical element, for example a reflector, for orienting the light rays from the light sources, to form the output light beam of the optical module.
  • Electroluminescent diode arrays such as matrices for example, are often used to obtain such a beam.
  • Each light emitting diode provides a component of the light beam coming out of the optical module.
  • a large number of diodes makes it possible not only to increase the brightness, but also to improve the resolution of the illumination obtained. Indeed, the beam then comprises more components for the same light beam.
  • the dies also make it possible to activate each light-emitting diode individually.
  • the individual activation of certain diodes gives the possibility to modulate the shape of the beam, or even to modify its extent lateral when there is potentially a wider beam than that used, and it is necessary to select a portion of the diodes only.
  • the projected beam has light holes in the direction of the vehicle detected in order to avoid dazzling the driver of the vehicle crossed or followed, while keeping a wide illumination on both sides of the vehicle.
  • the light hole or holes follow the movement of the detected vehicle; they move within the projected beam.
  • This function requires a high resolution of the beam, especially to define the mobile shadow area with high accuracy.
  • the invention therefore aims to obtain a projection device configured to project a light beam, which is capable of performing functions such as the aforementioned function with a high resolution, and keeping a reduced number of diodes.
  • the invention relates to a device for projecting a light beam with a mechanical actuator, in particular for a motor vehicle, comprising an array of light sources able to emit light rays to form the light beam along an optical axis, each source of light defining a component of the light beam having an initial resolution angle in a plane.
  • the device is remarkable in that it further comprises a mechanical actuator configured to move at least one element of the device so that the optical axis of the light beam is displaced between at least two projection directions in a periodic oscillatory motion to a determined displacement frequency, the projection directions forming between them a substantially coplanar displacement angle of the resolution angle, the displacement angle being equal to a fraction of the initial resolution angle of the beam.
  • the device therefore makes it possible to increase the resolution of the beam without having to add additional light sources. In particular, energy consumption and the risks of overheating due to a large concentration of sources are minimized. In addition, it allows the use of standard electronic components rather than more complex components to produce.
  • the invention also relates to an optical module comprising such a device for projecting a light beam with a mechanical actuator.
  • the invention also relates to a motor vehicle headlight provided with such an optical module.
  • the Figures 1 to 5 represent five different embodiments of the projection device 1 of a light beam with mechanical actuator according to the invention.
  • the projection device 1 may in particular be part of a motor vehicle headlight optical module, which is provided with projection lens means which partly form the light output beam of the optical module.
  • the lens means are represented by a single projection lens 3.
  • the device 1 comprises an array of light sources capable of emitting light rays to form the light beam and an optical system configured to partially form the light beam from the light rays from the light sources.
  • the network is for example a matrix of light-emitting diodes
  • the optical system is for example a single lens, or a correction lens or a system of several lenses which serves to homogenize the light beam and / or to correct optical aberrations.
  • the array of light sources and the optical system are represented together by a single element, which will be called source assembly 2 in the description.
  • Each light source of the network provides a component of the light beam projected by the device 1.
  • the light beam emitted by the device leaves the projection lens 3 along an optical axis 4.
  • the light beam 13, shown schematically on the figure 6 is divided horizontally into several components 10, here extended vertically, each light source of the network defining a component 10 of the beam 13. Each rectangle therefore corresponds to a component 10 of the beam 13 emitted by a different source.
  • the array is a series of aligned light sources, for example a light-emitting diode array.
  • the optical axis of the beam 13 is represented by a central point 22, the vertical and horizontal arrows illustrating the axes 11, 12 of a fixed reference in the space.
  • the beam 13 also has a resolution angle defined in the horizontal plane, the horizontal plane being defined by the horizontal axis 11 and the resolution angle by the double arrow 24. In the description, the beam resolution angle 13 is taken as an example equal to 1 °.
  • the device 1 is configured to periodically move the optical axis of the light beam 13 between two projection directions.
  • the device 1 is provided with a mechanical actuator 5 adapted to move in translation the source assembly 2 of the device relative to the projection lens 3.
  • the mechanical actuator 5 is a mechanical actuator with two positions, for example an electro magnet, a motor provided with a cam, a stepper motor or a piezoelectric motor.
  • the source assembly 2 is driven in a plane substantially parallel to the projection lens 3.
  • the source assembly 2 moves between two extreme positions, the first position corresponding to a first direction of projection of the optical axis beam, and the second position corresponding to a second direction of projection of the optical axis.
  • the figure 6 represents the beam 13 and its optical axis (point 22) in the first direction
  • the figure 7 represents the beam and its optical axis (point 23) in the second direction.
  • the vertical axis reference 12 and horizontal 11 being fixed, the beam shifted to the left.
  • the horizontal difference in position of the points 22 and 23 relative to the horizontal fixed reference point 11 corresponds to half the resolution angle represented by the double arrow 24.
  • the source assembly 2 For a beam with vertical components 10, such as that of the figure 6 , the source assembly 2 is moved horizontally so that the axis of the beam moves along the horizontal axis 11. The displacement of the beam is therefore substantially in the component division plane 10 of the beam 13. If the beam 13 was vertical with horizontal components, the source assembly 2 would be moved vertically. Thus, the two directions of the optical axis of the beam 13 form between them a substantially coplanar displacement angle of the beam resolution angle.
  • the two extreme positions are chosen so that the angle of displacement of the optical axis of the beam 13 is equal to a fraction of the angle of resolution of the beam 13.
  • the The angle of displacement between the two positions is preferably substantially equal to half the resolution angle, i.e. 0.5 ° here.
  • the source assembly 2, and therefore the axis of the beam 13, is further moved between the two positions by the actuator 5, at a determined displacement frequency not perceptible by the human eye.
  • a frequency must be greater than 40 Hz, and is preferably between 100 Hz and 200 Hz.
  • an observer looking at the projected beam 13 is not able to discern the two directions of the beam 13.
  • the observer sees a superposition of the two directions of the same beam 13, that is to say beam 13 of the figure 6 when the optical axis is in the first direction, and the beam of the figure 7 when the optical axis 13 is in the second direction.
  • the figure 8 shows us the effect obtained by this superposition, and the beam 13 which is really perceived by an observer.
  • the beam 13 then has a resolution angle 25, represented by the double arrow, which is twice as small as that of the original beam, that is to say 0.5 °.
  • the resolution of the beam has been multiplied by two.
  • the mechanical actuator 5 is furthermore configured to move the source assembly 2, and therefore the optical axis of the light beam 13, discontinuously, so that the optical axis of the light beam 13 is maintained in each of the two directions. during a hold time which is greater than the transition time between the two projection directions. In other words, the movement does not follow a movement at a constant speed.
  • the displacement follows a periodic function substantially in slots.
  • the top plates 16 and bottom 17 of the slots correspond to the holding time in each of the two extreme positions, and the slopes 18 each joining a top plate 16 to a bottom plate 17 correspond to the transition time.
  • the hold time lasts about four times longer than the time of transition.
  • the holding time is at least four times longer than the transition time, preferably at least twenty times, more preferably at least fifty times.
  • the figure 10 shows a beam 13 comprising vertical and horizontal components, the source array being for example a matrix of light-emitting diodes.
  • the figure 11 illustrates the beam 13 perceived by an observer when the beam 13 is moving through the device 1 according to the invention.
  • the beam 13 is moved horizontally, in a manner similar to the example of the Figures 6 and 7 , and provides increased horizontal resolution.
  • the light sources are individually activatable in order to be able to extinguish certain components of the beam while the other components remain on.
  • a shadow zone appears in the beam 13 whose resolution angle is equal to 1 ° in the previous example, the beam 13 being fixed.
  • the Figures 12 (a) and 12 (b) show an example of a light beam with a shadow zone produced by the third component extinguished on the Figure 12 (a) , and the fourth component extinguished on the figure 12 (b) .
  • the resolution angle of the shadow area is reduced to 0.5 °.
  • the shadow areas 21 can appear only on certain resolution angle components of 0.5 °, a complementary component always being lit. Specifically, only one resolution angle component of 0.5 ° out of two of the beam may appear off.
  • the light sources are activated at an activation frequency which is synchronized with the movement frequency of the light source. mechanical actuator 5.
  • This synchronization is illustrated in FIG. figure 12 .
  • the Figure 12 (a) shows the light beam 13 oriented in the first direction, and the figure 12 (b) the same light beam 13 oriented in the second direction.
  • the light source defining the third component is inactive, and on the figure 12 (b) it is the light source defining the fourth component which is inactive.
  • the activated source is alternated simultaneously with the change of direction of the beam 13 to obtain the shadow zone on the desired component.
  • the extinguished component is thus shifted in the opposite direction to the displacement of the beam 13.
  • the activation frequency is substantially equal to the beam displacement frequency.
  • the Figure 12 (c) is a graph showing the light intensity 19 of the beam 13 having a single shadow area corresponding to a single resolution angle component 26 of 0.5 °.
  • the superposition of the two beams 13 of Figures 12 (a) and 12 (b) leads to a resolution angle component of 0.5 ° which is completely extinguished because it comes from a superposition of two shadows, as shown by the dotted lines 27 of Figures 12 (a), 12 (b) and 12 (c) .
  • This component 21 is surrounded on both sides by two components of luminous intensity whose value is half less than the normal luminous intensity of a component, because they are obtained by superposition of a shadow zone and an illuminated area.
  • the other components all have luminosities of normal intensity because they are obtained by superposition of two illuminated areas.
  • the mechanical actuator 5 is configured to periodically move the source assembly 2 between an intermediate position and another position to choose from two opposite extreme positions with respect to the intermediate position.
  • the periodic displacement between the intermediate position and the first extreme position makes it possible to reveal a resolution angle of shadow zone of 0.5 ° on the beam with an inactive light source.
  • the periodic displacement between the intermediate position and the second extreme position makes it possible to reveal a complementary shadow zone with a resolution angle of 0.5 ° on the beam with the same inactive light source. Consequently, the axis of the beam is oriented periodically between an intermediate direction and a second direction chosen from two extreme directions corresponding to the movement of the source element 2.
  • the mechanical actuator moves the source assembly, either between the intermediate position and the first end position, or between the intermediate position and the second end position.
  • Each move produces an effect similar to that of Figures 6 and 7 as for the reduction of the angle of resolution.
  • the synchronization of the activation of the light sources with the displacement of the beam is not necessary, because it is possible to reveal shadows on the entire beam.
  • FIG. 2 On the figure 2 is represented a second embodiment similar to the first, with the same elements bearing the same references. The difference comes from the mechanical actuator 5 which here rotates the source assembly 2. To move from one position to another, the source assembly 2 follows a curve 6 corresponding to the focal curve of the projection lens 3, whose image focal point 7 is shown.
  • This embodiment is advantageous, particularly as regards the curvature of the field, when the optical system of the source assembly 2 is simple, with a single lens for example.
  • the first embodiment is however advantageous for more complex optical systems.
  • the mechanical actuator 5 only displaces the projection lens 3 in translation.
  • the source assembly 2 is fixed, it is the projection lens movement 3 which defines the orientation of the axis 4 of the beam.
  • the mechanical actuator 5 rotates all the other elements of the device 1, that is to say that the source system 2 and the projection lens 3 are jointly moved around the same axis.
  • This embodiment corresponds to the displacement of an optical module in rotation about an axis, horizontally or vertically.
  • the device 1 comprises a mirror 9 configured to reflect the light beam from the source assembly 2 to the projection lens 3.
  • the mechanical actuator 5 moves the mirror 9, or in translation when the mirror 9 is the only one element to move, or to rotate when moving together with the source assembly 2.
  • the device could be adapted to further divide the beam resolution angle.
  • the actuator 5 is configured to periodically move at least one of the elements of the device 1 to three positions.
  • the frequency of The displacement of the beam is thus chosen so that the displacement is not perceptible by an observer. In the three-way example, the frequency is at least 60Hz.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

L'invention concerne un dispositif de projection d'un faisceau lumineux à actionneur mécanique, notamment pour véhicule automobile, comprenant un réseau de sources de lumière (2) aptes à émettre des rayons lumineux pour former le faisceau lumineux selon un axe optique (4), chaque source de lumière (2) définissant une composante du faisceau lumineux qui présente un angle de résolution défini dans un plan, le dispositif comprenant en outre un actionneur mécanique (5) configuré pour déplacer au moins un élément du dispositif de sorte que l'axe optique (4) du faisceau lumineux soit déplacé entre au moins deux directions de projection à une fréquence de déplacement déterminée, les directions de projection formant entre elles un angle de déplacement sensiblement coplanaire de l'angle de résolution, l'angle de déplacement étant égal à une fraction de l'angle de résolution du faisceau.

Figure imgaf001
The invention relates to a device for projecting a light beam with a mechanical actuator, in particular for a motor vehicle, comprising an array of light sources (2) able to emit light rays to form the light beam along an optical axis (4). each light source (2) defining a component of the light beam having a resolution angle defined in a plane, the device further comprising a mechanical actuator (5) configured to move at least one element of the device so that the optical axis (4) of the light beam is displaced between at least two projection directions at a determined displacement frequency, the projection directions forming between them an angle of displacement substantially coplanar with the resolution angle, the displacement angle being equal to a fraction of the beam resolution angle.
Figure imgaf001

Description

La présente invention concerne un dispositif de projection de faisceau lumineux à actionneur mécanique, notamment pour véhicule automobile, un module optique et un projecteur de faisceau lumineux, de type feu de croisement ou feu de route, munis d'un tel dispositif de projection.The present invention relates to a light beam projection device with mechanical actuator, in particular for a motor vehicle, an optical module and a beam light projector, of the low beam or high beam type, provided with such a projection device.

Les projecteurs de véhicule automobile sont munis d'un ou de plusieurs modules optiques agencés dans un boîtier fermé par une glace de manière à obtenir un ou plusieurs faisceaux lumineux à la sortie du projecteur. De façon simplifiée, un module optique du boîtier comprend notamment une source de lumière, par exemple une (ou plusieurs) diode(s) électroluminescente(s), qui émet des rayons lumineux, et un système optique comportant une ou plusieurs lentilles et, le cas échéant un élément optique, par exemple un réflecteur, pour orienter les rayons lumineux issus des sources lumineuses, afin de former le faisceau lumineux de sortie du module optique.Motor vehicle headlamps are provided with one or more optical modules arranged in an enclosure closed by an ice so as to obtain one or more light beams at the exit of the headlamp. In a simplified way, an optical module of the housing notably comprises a light source, for example one (or more) electroluminescent diode (s), which emits light rays, and an optical system comprising one or more lenses and, optionally an optical element, for example a reflector, for orienting the light rays from the light sources, to form the output light beam of the optical module.

On utilise souvent des réseaux de diodes électroluminescentes, telles des matrices par exemple, pour obtenir un tel faisceau. Chaque diode électroluminescente fournit une composante du faisceau lumineux qui sort du module optique. Ainsi, un nombre important de diodes permet non seulement d'augmenter la luminosité, mais encore d'améliorer la résolution de l'éclairage obtenu. En effet, le faisceau comprend alors plus de composantes pour un même faisceau lumineux.Electroluminescent diode arrays, such as matrices for example, are often used to obtain such a beam. Each light emitting diode provides a component of the light beam coming out of the optical module. Thus, a large number of diodes makes it possible not only to increase the brightness, but also to improve the resolution of the illumination obtained. Indeed, the beam then comprises more components for the same light beam.

Les matrices permettent en outre d'activer individuellement chaque diode électroluminescente. L'activation individuelle de certaines diodes donne la possibilité de moduler la forme du faisceau, voire de modifier son étendue latérale lorsqu'on a potentiellement un faisceau plus large que celui utilisé, et qu'il est nécessaire de sélectionner une partie des diodes seulement.The dies also make it possible to activate each light-emitting diode individually. The individual activation of certain diodes gives the possibility to modulate the shape of the beam, or even to modify its extent lateral when there is potentially a wider beam than that used, and it is necessary to select a portion of the diodes only.

Par exemple, certaines technologies permettent de détecter des véhicules croisés ou suivis en amont de la direction de déplacement et de projeter un faisceau lumineux avec une zone d'ombre. Autrement dit, le faisceau projeté a des trous de lumière en direction du véhicule détecté afin d'éviter d'éblouir le conducteur du véhicule croisé ou suivi, tout en gardant un éclairage large de part et d'autre de ce véhicule. Lors de l'utilisation de cette fonction, le ou les trous de lumière suivent le déplacement du véhicule détecté ; ils se déplacent donc à l'intérieur du faisceau projeté. Cette fonction demande une haute résolution du faisceau, notamment pour définir la zone d'ombre mobile avec une grande précision.For example, certain technologies make it possible to detect crossed or tracked vehicles upstream of the direction of movement and to project a light beam with a shadow zone. In other words, the projected beam has light holes in the direction of the vehicle detected in order to avoid dazzling the driver of the vehicle crossed or followed, while keeping a wide illumination on both sides of the vehicle. When using this function, the light hole or holes follow the movement of the detected vehicle; they move within the projected beam. This function requires a high resolution of the beam, especially to define the mobile shadow area with high accuracy.

De plus, on souhaite éviter l'utilisation d'un trop grand nombre de sources de lumière simultanément, car cela induit une consommation d'énergie importante et un risque de surchauffe du module optique.In addition, it is desired to avoid the use of too many light sources simultaneously, because this induces a significant energy consumption and a risk of overheating of the optical module.

L'invention vise donc à obtenir un dispositif de projection configuré pour projeter un faisceau lumineux, qui soit capable de remplir des fonctions telle que la fonction précitée avec une résolution importante, et en conservant un nombre de diodes réduit.The invention therefore aims to obtain a projection device configured to project a light beam, which is capable of performing functions such as the aforementioned function with a high resolution, and keeping a reduced number of diodes.

Pour cela, l'invention concerne un dispositif de projection d'un faisceau lumineux à actionneur mécanique, notamment pour véhicule automobile, comprenant un réseau de sources de lumière aptes à émettre des rayons lumineux pour former le faisceau lumineux selon un axe optique, chaque source de lumière définissant une composante du faisceau lumineux qui présente un angle de résolution initial dans un plan.For this, the invention relates to a device for projecting a light beam with a mechanical actuator, in particular for a motor vehicle, comprising an array of light sources able to emit light rays to form the light beam along an optical axis, each source of light defining a component of the light beam having an initial resolution angle in a plane.

Le dispositif est remarquable en ce qu'il comprend en outre un actionneur mécanique configuré pour déplacer au moins un élément du dispositif de sorte que l'axe optique du faisceau lumineux soit déplacé entre au moins deux directions de projection selon un mouvement oscillant périodique à une fréquence de déplacement déterminée, les directions de projection formant entre elles un angle de déplacement sensiblement coplanaire de l'angle de résolution, l'angle de déplacement étant égal à une fraction de l'angle de résolution initial du faisceau.The device is remarkable in that it further comprises a mechanical actuator configured to move at least one element of the device so that the optical axis of the light beam is displaced between at least two projection directions in a periodic oscillatory motion to a determined displacement frequency, the projection directions forming between them a substantially coplanar displacement angle of the resolution angle, the displacement angle being equal to a fraction of the initial resolution angle of the beam.

Ainsi, en imprimant un mouvement oscillant périodique à l'axe optique du faisceau entre au moins deux directions définissant un angle de déplacement qui est une fraction de l'angle de résolution initial du faisceau, on obtient une meilleure résolution finale du faisceau lumineux. Dès lors, pour un observateur du faisceau lumineux, si les bords de coupure sont bien nets, chaque composante apparaîtra comme étant fractionnée.Thus, by printing a periodic oscillating motion at the optical axis of the beam between at least two directions defining a displacement angle which is a fraction of the initial beam resolution angle, a better final resolution of the light beam is obtained. Therefore, for an observer of the light beam, if the cut edges are clear, each component will appear to be split.

Le dispositif permet par conséquent d'augmenter la résolution du faisceau sans avoir à ajouter de sources de lumière supplémentaires. On minimise en particulier la consommation d'énergie et les risques de surchauffe dus à une concentration importante de sources. De plus, il permet d'avoir recours à des composants électroniques standards plutôt qu'à des composants plus complexes à produire.The device therefore makes it possible to increase the resolution of the beam without having to add additional light sources. In particular, energy consumption and the risks of overheating due to a large concentration of sources are minimized. In addition, it allows the use of standard electronic components rather than more complex components to produce.

Selon différents modes de réalisation de l'invention, qui pourront être pris ensemble ou séparément :

  • l'angle de déplacement est sensiblement égal à la moitié de l'angle de résolution,
  • l'actionneur mécanique est configuré pour déplacer l'élément de sorte que la fréquence de déplacement de l'axe optique soit une fréquence non perceptible par l'oeil humain,
  • l'actionneur mécanique est configuré pour déplacer l'élément de façon discontinue de sorte que l'axe optique du faisceau lumineux est maintenu dans chaque direction de projection pendant un temps de maintien qui est supérieur au temps de transition entre les deux directions de projection,
  • les sources de lumière sont activables individuellement à une fréquence d'activation définie afin de moduler le faisceau projeté de façon à produire une zone d'ombre mobile dans le faisceau lumineux,
  • la fréquence d'activation des sources de lumière et la fréquence de déplacement de l'axe optique sont synchronisées,
  • le dispositif comprend un système optique configuré pour former le faisceau lumineux à partir des rayons lumineux provenant des sources de lumière,
  • le réseau de sources de lumière est une matrice de diodes électroluminescentes,
  • le dispositif comprend des moyens formant lentille de projection, les moyens formant lentille de projection étant aptes à former en partie le faisceau lumineux,
  • l'actionneur mécanique est apte à déplacer en translation le réseau de sources de lumière,
  • l'actionneur mécanique est apte à déplacer en rotation le réseau de sources de lumière,
  • l'actionneur mécanique est apte à déplacer en rotation conjointement les moyens formant lentille de projection et le réseau de sources de lumière,
  • l'actionneur mécanique est apte à déplacer en translation les moyens formant lentille de projection.
  • le dispositif comprend un miroir configuré pour réfléchir le faisceau lumineux, l'actionneur mécanique étant apte à déplacer le miroir.
According to various embodiments of the invention, which may be taken together or separately:
  • the angle of displacement is substantially equal to half the angle of resolution,
  • the mechanical actuator is configured to move the element so that the displacement frequency of the optical axis is a frequency not perceptible to the human eye,
  • the mechanical actuator is configured to move the element discontinuously so that the optical axis of the light beam is maintained in each projection direction for a holding time which is greater than the transition time between the two projection directions,
  • the light sources are individually activatable at a defined activation frequency in order to modulate the projected beam so as to produce a moving shadow zone in the light beam,
  • the activation frequency of the light sources and the frequency of displacement of the optical axis are synchronized,
  • the device comprises an optical system configured to form the light beam from the light rays from the light sources,
  • the light source array is a matrix of light-emitting diodes,
  • the device comprises projection lens means, the projection lens means being able to form part of the light beam,
  • the mechanical actuator is able to move the light source array in translation,
  • the mechanical actuator is able to rotate the network of light sources,
  • the mechanical actuator is able to jointly rotate the projection lens means and the light source array,
  • the mechanical actuator is able to move in translation the projection lens means.
  • the device comprises a mirror configured to reflect the light beam, the mechanical actuator being able to move the mirror.

L'invention se rapporte également à un module optique comprenant un tel dispositif de projection d'un faisceau lumineux à actionneur mécanique.The invention also relates to an optical module comprising such a device for projecting a light beam with a mechanical actuator.

L'invention se rapporte encore à un projecteur de véhicule automobile muni d'un tel module optique.The invention also relates to a motor vehicle headlight provided with such an optical module.

L'invention sera mieux comprise à la lumière de la description suivante qui n'est donnée qu'à titre indicatif et qui n'a pas pour but de la limiter, accompagnée des dessins joints :

  • la figure 1 illustrant de façon schématique, une vue en perspective d'un premier mode de réalisation d'un dispositif selon l'invention,
  • la figure 2 illustrant de façon schématique, une vue de dessus d'un deuxième mode de réalisation d'un dispositif selon l'invention,
  • la figure 3 illustrant de façon schématique, une vue de dessus d'un troisième mode de réalisation d'un dispositif selon l'invention,
  • la figure 4 illustrant de façon schématique, une vue de dessus d'un quatrième mode de réalisation d'un dispositif selon l'invention,
  • la figure 5 illustrant de façon schématique, une vue de dessus d'un cinquième mode de réalisation d'un dispositif selon l'invention,
  • la figure 6 illustrant de façon schématique, un faisceau lumineux projeté par le dispositif avec un axe optique dans une première direction,
  • la figure 7 illustrant de façon schématique, un faisceau lumineux projeté par le dispositif avec un axe optique dans une deuxième direction,
  • la figure 8 illustrant de façon schématique, un faisceau lumineux perçu par un observateur,
  • la figure 9 illustrant de façon schématique, un graphique représentant le déplacement de l'axe optique du faisceau lumineux,
  • la figure 10 illustrant de façon schématique, un autre type de faisceau lumineux projeté par le dispositif,
  • la figure 11 illustrant de façon schématique, le faisceau lumineux perçu par l'observateur à partir de celui de la figure 10,
  • la figure 12 illustrant de façon schématique, la formation d'une zone d'ombre dans un faisceau.
The invention will be better understood in the light of the following description which is given for information only and which is not intended to limit it, accompanied by the attached drawings:
  • the figure 1 schematically illustrating a perspective view of a first embodiment of a device according to the invention,
  • the figure 2 schematically illustrating a view from above of a second embodiment of a device according to the invention,
  • the figure 3 schematically illustrating a view from above of a third embodiment of a device according to the invention,
  • the figure 4 schematically illustrating a view from above of a fourth embodiment of a device according to the invention,
  • the figure 5 schematically illustrating a view from above of a fifth embodiment of a device according to the invention,
  • the figure 6 illustrating schematically a light beam projected by the device with an optical axis in a first direction,
  • the figure 7 illustrating schematically a light beam projected by the device with an optical axis in a second direction,
  • the figure 8 schematically illustrating a light beam perceived by an observer,
  • the figure 9 schematically illustrating a graph representing the displacement of the optical axis of the light beam,
  • the figure 10 illustrating schematically another type of light beam projected by the device,
  • the figure 11 schematically illustrating the light beam perceived by the observer from that of the figure 10 ,
  • the figure 12 illustrating schematically the formation of a shadow zone in a beam.

Les figures 1 à 5 représentent cinq modes de réalisation différents du dispositif de projection 1 d'un faisceau lumineux à actionneur mécanique selon l'invention. Le dispositif de projection 1 peut notamment faire partie d'un module optique de projecteur de véhicule automobile, qui est muni de moyens formant lentille de projection qui forment en partie le faisceau lumineux de sortie du module optique. Sur les figures, les moyens formant lentille sont représentés par une lentille de projection 3 unique.The Figures 1 to 5 represent five different embodiments of the projection device 1 of a light beam with mechanical actuator according to the invention. The projection device 1 may in particular be part of a motor vehicle headlight optical module, which is provided with projection lens means which partly form the light output beam of the optical module. In the figures, the lens means are represented by a single projection lens 3.

Sur la figure 1, le dispositif 1 comprend un réseau de sources de lumière aptes à émettre des rayons lumineux pour former le faisceau lumineux et un système optique configuré pour former en partie le faisceau lumineux à partir des rayons lumineux provenant des sources de lumière. Le réseau est par exemple une matrice de diodes électroluminescentes, et le système optique est par exemple une lentille simple, ou une lentille de correction ou un système de plusieurs lentilles qui sert à homogénéiser le faisceau lumineux et/ou à corriger les aberrations optiques. Le réseau de sources de lumière et le système optique sont représentés ensemble par un élément unique, que l'on appellera ensemble source 2 dans la description. Chaque source de lumière du réseau fournit une composante du faisceau lumineux projeté par le dispositif 1.On the figure 1 the device 1 comprises an array of light sources capable of emitting light rays to form the light beam and an optical system configured to partially form the light beam from the light rays from the light sources. The network is for example a matrix of light-emitting diodes, and the optical system is for example a single lens, or a correction lens or a system of several lenses which serves to homogenize the light beam and / or to correct optical aberrations. The array of light sources and the optical system are represented together by a single element, which will be called source assembly 2 in the description. Each light source of the network provides a component of the light beam projected by the device 1.

Le faisceau lumineux émis par le dispositif sort par la lentille de projection 3 selon un axe optique 4. Le faisceau lumineux 13, représenté schématiquement sur la figure 6, est divisé horizontalement en plusieurs composantes 10, ici étendues verticalement, chaque source de lumière du réseau définissant une composante 10 du faisceau 13. Chaque rectangle correspond donc à une composante 10 du faisceau 13 émis par une source différente. Ici, le réseau est une série de sources de lumière alignées, par exemple une barrette de diodes électroluminescentes. L'axe optique du faisceau 13 est représenté par un point central 22, les flèches verticales et horizontales illustrant les axes 11, 12 d'un repère fixe dans l'espace. Le faisceau 13 présente en outre un angle de résolution défini dans le plan horizontal, le plan horizontal étant défini par l'axe horizontal 11 et l'angle de résolution par la double flèche 24. Dans la description, l'angle de résolution du faisceau 13 est pris à titre d'exemple égal à 1°.The light beam emitted by the device leaves the projection lens 3 along an optical axis 4. The light beam 13, shown schematically on the figure 6 , is divided horizontally into several components 10, here extended vertically, each light source of the network defining a component 10 of the beam 13. Each rectangle therefore corresponds to a component 10 of the beam 13 emitted by a different source. Here, the array is a series of aligned light sources, for example a light-emitting diode array. The optical axis of the beam 13 is represented by a central point 22, the vertical and horizontal arrows illustrating the axes 11, 12 of a fixed reference in the space. The beam 13 also has a resolution angle defined in the horizontal plane, the horizontal plane being defined by the horizontal axis 11 and the resolution angle by the double arrow 24. In the description, the beam resolution angle 13 is taken as an example equal to 1 °.

Afin d'augmenter la résolution optique du faisceau 13, et donc diminuer l'angle de résolution, le dispositif 1 est configuré pour déplacer périodiquement l'axe optique du faisceau lumineux 13 entre deux directions de projection.In order to increase the optical resolution of the beam 13, and thus reduce the resolution angle, the device 1 is configured to periodically move the optical axis of the light beam 13 between two projection directions.

A cette fin, dans le premier mode de réalisation de la figure 1, le dispositif 1 est doté d'un actionneur mécanique 5 apte à déplacer en translation l'ensemble source 2 du dispositif par rapport à la lentille de projection 3. L'actionneur mécanique 5 est un actuateur mécanique à deux positions, par exemple un électro-aimant, un moteur muni d'une came, un moteur pas-à-pas ou encore un moteur piézo-électrique.For this purpose, in the first embodiment of the figure 1 , the device 1 is provided with a mechanical actuator 5 adapted to move in translation the source assembly 2 of the device relative to the projection lens 3. The mechanical actuator 5 is a mechanical actuator with two positions, for example an electro magnet, a motor provided with a cam, a stepper motor or a piezoelectric motor.

L'ensemble source 2 est animé d'un mouvement dans un plan sensiblement parallèle à la lentille de projection 3. L'ensemble source 2 se déplace entre deux positions extrêmes, la première position correspondant à une première direction de projection de l'axe optique du faisceau, et la deuxième position correspondant à une deuxième direction de projection de l'axe optique.The source assembly 2 is driven in a plane substantially parallel to the projection lens 3. The source assembly 2 moves between two extreme positions, the first position corresponding to a first direction of projection of the optical axis beam, and the second position corresponding to a second direction of projection of the optical axis.

La figure 6 représente le faisceau 13 et son axe optique (point 22) dans la première direction, et la figure 7 représente le faisceau et son axe optique (point 23) dans la deuxième direction. On remarque que le repère des axes vertical 12 et horizontal 11 étant fixe, le faisceau s'est décalé vers la gauche. L'écart horizontal de position des points 22 et 23 par rapport au repère fixe horizontal 11 correspond à la moitié de l'angle de résolution représenté par la double flèche 24.The figure 6 represents the beam 13 and its optical axis (point 22) in the first direction, and the figure 7 represents the beam and its optical axis (point 23) in the second direction. Note that the vertical axis reference 12 and horizontal 11 being fixed, the beam shifted to the left. The horizontal difference in position of the points 22 and 23 relative to the horizontal fixed reference point 11 corresponds to half the resolution angle represented by the double arrow 24.

Pour un faisceau muni de composantes verticales 10, comme celui de la figure 6, l'ensemble source 2 est déplacé horizontalement afin que l'axe du faisceau se déplace selon l'axe horizontal 11. Le déplacement du faisceau est donc effectué sensiblement dans le plan de division en composantes 10 du faisceau 13. Si le faisceau 13 était vertical avec des composantes 10 horizontales, l'ensemble source 2 serait déplacé verticalement. Ainsi, les deux directions de l'axe optique du faisceau 13 forment entre elles un angle de déplacement sensiblement coplanaire de l'angle de résolution du faisceau.For a beam with vertical components 10, such as that of the figure 6 , the source assembly 2 is moved horizontally so that the axis of the beam moves along the horizontal axis 11. The displacement of the beam is therefore substantially in the component division plane 10 of the beam 13. If the beam 13 was vertical with horizontal components, the source assembly 2 would be moved vertically. Thus, the two directions of the optical axis of the beam 13 form between them a substantially coplanar displacement angle of the beam resolution angle.

Les deux positions extrêmes sont choisies de sorte que l'angle de déplacement de l'axe optique du faisceau 13 soit égal à une fraction de l'angle de résolution du faisceau 13. Pour diminuer l'angle de résolution par exemple de moitié, l'angle de déplacement entre les deux positions est de préférence sensiblement égal à la moitié de l'angle de résolution, c'est-à-dire 0.5° ici. On voit sur les figures 6 et 7 que l'axe vertical 12 est passé de la limite entre la troisième et la quatrième composante sur la figure 6, vers le milieu de la quatrième composante sur la figure 7.The two extreme positions are chosen so that the angle of displacement of the optical axis of the beam 13 is equal to a fraction of the angle of resolution of the beam 13. In order to reduce the resolution angle, for example by half, the The angle of displacement between the two positions is preferably substantially equal to half the resolution angle, i.e. 0.5 ° here. We see on Figures 6 and 7 that the vertical axis 12 has gone from the boundary between the third and the fourth component on the figure 6 , towards the middle of the fourth component on the figure 7 .

L'ensemble source 2, et donc l'axe du faisceau 13, est en outre déplacé entre les deux positions par l'actionneur 5, à une fréquence de déplacement déterminée non perceptible par l'oeil humain. Une telle fréquence doit être supérieure à 40Hz, et est de préférence comprise entre 100 Hz et 200 Hz.The source assembly 2, and therefore the axis of the beam 13, is further moved between the two positions by the actuator 5, at a determined displacement frequency not perceptible by the human eye. Such a frequency must be greater than 40 Hz, and is preferably between 100 Hz and 200 Hz.

Ainsi, un observateur qui regarde le faisceau 13 projeté, n'est pas en mesure de discerner les deux directions du faisceau 13. Autrement dit, l'observateur voit une superposition des deux directions du même faisceau 13, c'est-à-dire du faisceau 13 de la figure 6 lorsque l'axe optique est dans la première direction, et du faisceau de la figure 7 lorsque l'axe optique 13 est dans la deuxième direction.Thus, an observer looking at the projected beam 13 is not able to discern the two directions of the beam 13. In other words, the observer sees a superposition of the two directions of the same beam 13, that is to say beam 13 of the figure 6 when the optical axis is in the first direction, and the beam of the figure 7 when the optical axis 13 is in the second direction.

La figure 8 nous montre l'effet obtenu par cette superposition, et le faisceau 13 qui est réellement perçu par un observateur. On remarque que le faisceau 13 a alors un angle de résolution 25, représenté par la double flèche, qui est deux fois plus petit que celui du faisceau d'origine, c'est-à-dire 0,5°. Ainsi, la résolution du faisceau a été multipliée par deux.The figure 8 shows us the effect obtained by this superposition, and the beam 13 which is really perceived by an observer. Note that the beam 13 then has a resolution angle 25, represented by the double arrow, which is twice as small as that of the original beam, that is to say 0.5 °. Thus, the resolution of the beam has been multiplied by two.

L'actionneur mécanique 5 est en outre configuré pour déplacer l'ensemble source 2, et donc l'axe optique du faisceau lumineux 13, de façon discontinue, de sorte que l'axe optique du faisceau lumineux 13 est maintenu dans chacune des deux directions pendant un temps de maintien qui est supérieur au temps de transition entre les deux directions de projection. Autrement dit, le déplacement ne suit pas un mouvement à vitesse constante.The mechanical actuator 5 is furthermore configured to move the source assembly 2, and therefore the optical axis of the light beam 13, discontinuously, so that the optical axis of the light beam 13 is maintained in each of the two directions. during a hold time which is greater than the transition time between the two projection directions. In other words, the movement does not follow a movement at a constant speed.

En effet, on souhaite obtenir une superposition des deux orientations du faisceau, tout en minimisant la superposition d'autres directions du faisceau qui correspondent à des positions intermédiaires. Comme le montre la figure 9, où la position de l'ensemble source 2 figure en ordonnée 14 et le temps figure en abscisse 15, le déplacement suit une fonction périodique sensiblement en créneaux. Les plateaux haut 16 et bas 17 des créneaux correspondent au temps de maintien dans chacune des deux positions extrêmes, et les pentes 18 joignant chacune un plateau haut 16 à un plateau bas 17 correspondent au temps de transition. Ici, on remarque que le temps de maintien dure environ quatre fois plus longtemps que le temps de transition. Avantageusement, le temps de maintien est au moins quatre fois plus long que le temps de transition, de préférence au moins vingt fois, plus préférentiellement au moins cinquante fois.Indeed, it is desired to obtain a superposition of the two orientations of the beam, while minimizing the superposition of other beam directions that correspond to intermediate positions. As shown in figure 9 , where the position of the source assembly 2 is on the ordinate 14 and the time is on the abscissa 15, the displacement follows a periodic function substantially in slots. The top plates 16 and bottom 17 of the slots correspond to the holding time in each of the two extreme positions, and the slopes 18 each joining a top plate 16 to a bottom plate 17 correspond to the transition time. Here, we notice that the hold time lasts about four times longer than the time of transition. Advantageously, the holding time is at least four times longer than the transition time, preferably at least twenty times, more preferably at least fifty times.

Dans une variante de réalisation, la figure 10 montre un faisceau 13 comportant des composantes verticales et horizontales, le réseau de source étant par exemple une matrice de diodes électroluminescentes. La figure 11 illustre le faisceau 13 perçu par un observateur lorsque le faisceau 13 est en mouvement grâce au dispositif 1 selon l'invention. Le faisceau 13 est déplacé horizontalement, de façon semblable à l'exemple des figures 6 et 7, et permet d'obtenir une résolution horizontale accrue.In an alternative embodiment, the figure 10 shows a beam 13 comprising vertical and horizontal components, the source array being for example a matrix of light-emitting diodes. The figure 11 illustrates the beam 13 perceived by an observer when the beam 13 is moving through the device 1 according to the invention. The beam 13 is moved horizontally, in a manner similar to the example of the Figures 6 and 7 , and provides increased horizontal resolution.

Tel que représenté sur la figure 12, les sources de lumière sont activables individuellement afin de pouvoir éteindre certaines composantes 10 du faisceau alors que les autres composantes restent allumées. Ainsi, on peut moduler le faisceau projeté pour produire une zone d'ombre 21 mobile dans le faisceau lumineux 13. Lorsqu'une seule source de lumière est inactive, une zone d'ombre apparaît dans le faisceau 13 dont l'angle de résolution est égal à 1° dans l'exemple précédent, le faisceau 13 étant fixe. Les figures 12(a) et 12(b) montrent un exemple de faisceau lumineux avec une zone d'ombre produite par la troisième composante éteinte sur la figure 12(a), et la quatrième composante éteinte sur la figure 12(b).As shown on the figure 12 the light sources are individually activatable in order to be able to extinguish certain components of the beam while the other components remain on. Thus, it is possible to modulate the projected beam to produce a moving shadow zone 21 in the light beam 13. When a single light source is inactive, a shadow zone appears in the beam 13 whose resolution angle is equal to 1 ° in the previous example, the beam 13 being fixed. The Figures 12 (a) and 12 (b) show an example of a light beam with a shadow zone produced by the third component extinguished on the Figure 12 (a) , and the fourth component extinguished on the figure 12 (b) .

Lorsqu'on laisse la même source de lumière inactive pendant que le faisceau change de direction de manière périodique selon l'invention, l'angle de résolution de la zone d'ombre est réduit à 0.5°. Cependant, dans ce cas, les zones d'ombre 21 ne peuvent apparaitre que sur certaines composantes d'angle de résolution de 0.5°, une composante complémentaire étant toujours allumée. Plus précisément, seulement une composante d'angle de résolution de 0.5° sur deux du faisceau peut apparaître éteinte.When the same inactive light source is left while the beam changes direction periodically according to the invention, the resolution angle of the shadow area is reduced to 0.5 °. However, in this case, the shadow areas 21 can appear only on certain resolution angle components of 0.5 °, a complementary component always being lit. Specifically, only one resolution angle component of 0.5 ° out of two of the beam may appear off.

Selon une première variante de réalisation, pour faire apparaître des zones d'ombre sur les autres composantes d'angle de résolution de 0.5°, les sources de lumière sont activées à une fréquence d'activation qui est synchronisée avec la fréquence de déplacement de l'actionneur mécanique 5. Cette synchronisation est illustrée à la figure 12. La figure 12 (a) montre le faisceau lumineux 13 orienté selon la première direction, et la figure 12 (b) le même faisceau lumineux 13 orienté selon la deuxième direction. Sur la figure 12 (a), la source de lumière définissant la troisième composante est inactive, et sur la figure 12 (b), c'est la source de lumière définissant la quatrième composante qui est inactive. Ainsi, on alterne la source activée simultanément au changement de direction du faisceau 13 pour obtenir la zone d'ombre sur la composante souhaitée. La composante éteinte est donc décalée dans le sens inverse du déplacement du faisceau 13. De préférence, la fréquence d'activation est sensiblement égale à la fréquence de déplacement du faisceau.According to a first variant embodiment, in order to make shadow areas appear on the other resolution angle components of 0.5 °, the light sources are activated at an activation frequency which is synchronized with the movement frequency of the light source. mechanical actuator 5. This synchronization is illustrated in FIG. figure 12 . The Figure 12 (a) shows the light beam 13 oriented in the first direction, and the figure 12 (b) the same light beam 13 oriented in the second direction. On the Figure 12 (a) , the light source defining the third component is inactive, and on the figure 12 (b) it is the light source defining the fourth component which is inactive. Thus, the activated source is alternated simultaneously with the change of direction of the beam 13 to obtain the shadow zone on the desired component. The extinguished component is thus shifted in the opposite direction to the displacement of the beam 13. Preferably, the activation frequency is substantially equal to the beam displacement frequency.

La figure 12 (c) est un graphique représentant l'intensité lumineuse 19 du faisceau 13 ayant une zone d'ombre unique correspondant à une seule composante d'angle de résolution 26 de 0.5°. La superposition des deux faisceaux 13 des figures 12 (a) et 12(b) aboutit a une composante d'angle de résolution de 0.5° qui est complètement éteinte car elle est issue d'une superposition de deux zones d'ombres, comme le montrent les pointillés 27 des figures 12 (a), 12(b) et 12 (c). Cette composante 21 est entourée de part et d'autre par deux composantes d'intensité lumineuse dont la valeur est moitié moins importante que l'intensité lumineuse normale d'une composante, car elles sont obtenues par superposition d'une zone d'ombre et d'une zone éclairée. Les autres composantes ont toutes des luminosités d'intensité normale car elles sont obtenues par superposition de deux zones éclairées.The Figure 12 (c) is a graph showing the light intensity 19 of the beam 13 having a single shadow area corresponding to a single resolution angle component 26 of 0.5 °. The superposition of the two beams 13 of Figures 12 (a) and 12 (b) leads to a resolution angle component of 0.5 ° which is completely extinguished because it comes from a superposition of two shadows, as shown by the dotted lines 27 of Figures 12 (a), 12 (b) and 12 (c) . This component 21 is surrounded on both sides by two components of luminous intensity whose value is half less than the normal luminous intensity of a component, because they are obtained by superposition of a shadow zone and an illuminated area. The other components all have luminosities of normal intensity because they are obtained by superposition of two illuminated areas.

Selon une deuxième variante de réalisation, non représentée sur les figures, l'actionneur mécanique 5 est configuré pour déplacer périodiquement l'ensemble source 2 entre une position intermédiaire et une autre position à choisir parmi deux positions extrêmes opposées par rapport à la position intermédiaire. Le déplacement périodique entre la position intermédiaire et la première position extrême permet de faire apparaître une zone d'ombre d'angle de résolution de 0.5° sur le faisceau avec une source de lumière inactive. Le déplacement périodique entre la position intermédiaire et la seconde position extrême permet de faire apparaître une zone d'ombre complémentaire d'angle de résolution de 0.5° sur le faisceau avec la même source de lumière inactive. Par conséquent, l'axe du faisceau est orienté périodiquement entre une direction intermédiaire et une deuxième direction choisie parmi deux directions extrêmes correspondant au mouvement de l'élément source 2.According to a second alternative embodiment, not shown in the figures, the mechanical actuator 5 is configured to periodically move the source assembly 2 between an intermediate position and another position to choose from two opposite extreme positions with respect to the intermediate position. The periodic displacement between the intermediate position and the first extreme position makes it possible to reveal a resolution angle of shadow zone of 0.5 ° on the beam with an inactive light source. The periodic displacement between the intermediate position and the second extreme position makes it possible to reveal a complementary shadow zone with a resolution angle of 0.5 ° on the beam with the same inactive light source. Consequently, the axis of the beam is oriented periodically between an intermediate direction and a second direction chosen from two extreme directions corresponding to the movement of the source element 2.

Ainsi, selon la composante à éteindre, l'actionneur mécanique déplace l'ensemble source, soit entre la position intermédiaire et la première position extrême, soit entre la position intermédiaire et la seconde position extrême. Chaque déplacement produit un effet semblable à celui des figures 6 et 7 pour ce qui est de la réduction de l'angle de résolution. Dans cette variante, la synchronisation de l'activation des sources de lumières avec le déplacement du faisceau n'est pas nécessaire, car il est possible de faire apparaître des zones d'ombre sur tout le faisceau.Thus, depending on the component to be switched off, the mechanical actuator moves the source assembly, either between the intermediate position and the first end position, or between the intermediate position and the second end position. Each move produces an effect similar to that of Figures 6 and 7 as for the reduction of the angle of resolution. In this variant, the synchronization of the activation of the light sources with the displacement of the beam is not necessary, because it is possible to reveal shadows on the entire beam.

Les modes de réalisation suivants ont les mêmes effets et avantages sur le faisceau lumineux que le premier mode de réalisation.The following embodiments have the same effects and advantages on the light beam as the first embodiment.

Sur la figure 2 est représenté un deuxième mode de réalisation semblable au premier, avec les mêmes éléments portants les mêmes références. La différence provient de l'actionneur mécanique 5 qui déplace ici en rotation l'ensemble source 2. Pour passer d'une position à l'autre, l'ensemble source 2 suit une courbe 6 correspondant à la courbe focale de la lentille de projection 3, dont le point focal image 7 est représenté. Ce mode de réalisation est avantageux, notamment concernant la courbure de champ, lorsque le système optique de l'ensemble source 2 est simple, avec une seule lentille par exemple. Le premier mode de réalisation est en revanche avantageux pour des systèmes optiques plus complexes.On the figure 2 is represented a second embodiment similar to the first, with the same elements bearing the same references. The difference comes from the mechanical actuator 5 which here rotates the source assembly 2. To move from one position to another, the source assembly 2 follows a curve 6 corresponding to the focal curve of the projection lens 3, whose image focal point 7 is shown. This embodiment is advantageous, particularly as regards the curvature of the field, when the optical system of the source assembly 2 is simple, with a single lens for example. The first embodiment is however advantageous for more complex optical systems.

Dans un troisième mode de réalisation, représenté sur la figure 3, l'actionneur mécanique 5 déplace seulement la lentille de projection 3 en translation. Ici, l'ensemble source 2 est fixe, c'est le mouvement de lentille de projection 3 qui définit l'orientation de l'axe 4 du faisceau.In a third embodiment, shown in the figure 3 the mechanical actuator 5 only displaces the projection lens 3 in translation. Here, the source assembly 2 is fixed, it is the projection lens movement 3 which defines the orientation of the axis 4 of the beam.

Selon un quatrième mode de réalisation, illustré par la figure 4, l'actionneur mécanique 5 déplace en rotation tous les autres éléments du dispositif 1, c'est-dire que le système source 2 et la lentille de projection 3 sont conjointement déplacées autour d'un même axe. Ce mode de réalisation correspond au déplacement d'un module optique en rotation autour d'un axe, horizontalement ou verticalement.According to a fourth embodiment, illustrated by the figure 4 , the mechanical actuator 5 rotates all the other elements of the device 1, that is to say that the source system 2 and the projection lens 3 are jointly moved around the same axis. This embodiment corresponds to the displacement of an optical module in rotation about an axis, horizontally or vertically.

Dans un cinquième mode de réalisation présenté sur la figure 5, le dispositif 1 comprend un miroir 9 configuré pour réfléchir le faisceau lumineux issu de l'ensemble source 2 vers la lentille de projection 3. Ici, l'actionneur mécanique 5 déplace le miroir 9, soit en translation lorsque le miroir 9 est le seul élément à se déplacer, soit en rotation lorsqu'il se déplace conjointement à l'ensemble source 2.In a fifth embodiment presented on the figure 5 , the device 1 comprises a mirror 9 configured to reflect the light beam from the source assembly 2 to the projection lens 3. Here, the mechanical actuator 5 moves the mirror 9, or in translation when the mirror 9 is the only one element to move, or to rotate when moving together with the source assembly 2.

La description présente des exemples de l'invention d'angle de résolution divisé par deux. Néanmoins, le dispositif pourrait être adapté de manière à diviser davantage l'angle de résolution du faisceau. Ainsi, en choisissant d'orienter périodiquement le faisceau dans trois positions au lieu de deux, il est possible de diviser l'angle de résolution par trois, et atteindre un angle sensiblement égal à 0.33° pour les exemples cités précédemment. A cette fin, l'actionneur 5 est configuré pour déplacer périodiquement au moins un des éléments du dispositif 1 sur trois positions. La fréquence du déplacement du faisceau est donc choisie pour que le déplacement ne soit pas perceptible par un observateur. Dans l'exemple à trois directions, la fréquence est d'au moins 60Hz.The description presents examples of the invention of resolution angle divided by two. Nevertheless, the device could be adapted to further divide the beam resolution angle. Thus, by choosing to periodically orient the beam in three positions instead of two, it is possible to divide the resolution angle by three, and reach an angle substantially equal to 0.33 ° for the examples mentioned above. For this purpose, the actuator 5 is configured to periodically move at least one of the elements of the device 1 to three positions. The frequency of The displacement of the beam is thus chosen so that the displacement is not perceptible by an observer. In the three-way example, the frequency is at least 60Hz.

Claims (16)

Dispositif de projection d'un faisceau lumineux à actionneur mécanique, notamment pour véhicule automobile, comprenant un réseau de sources de lumière (2) aptes à émettre des rayons lumineux pour former le faisceau lumineux (13) selon un axe optique (4), chaque source de lumière (2) définissant une composante (10) du faisceau lumineux (13) qui présente un angle de résolution défini dans un plan, caractérisé en ce qu'il comprend en outre un actionneur mécanique (5) configuré pour déplacer au moins un élément du dispositif de sorte que l'axe optique (4) du faisceau lumineux (13) soit déplacé entre au moins deux directions de projection selon un mouvement oscillant périodique à une fréquence de déplacement déterminée, les directions de projection formant entre elles un angle de déplacement sensiblement coplanaire de l'angle de résolution, l'angle de déplacement étant égal à une fraction de l'angle de résolution du faisceau.Device for projecting a light beam with a mechanical actuator, in particular for a motor vehicle, comprising an array of light sources (2) capable of emitting light rays to form the light beam (13) along an optical axis (4), each light source (2) defining a component (10) of the light beam (13) having a resolution angle defined in a plane, characterized in that it further comprises a mechanical actuator (5) configured to move at least one element of the device so that the optical axis (4) of the light beam (13) is displaced between at least two projection directions according to a periodic oscillatory movement at a determined displacement frequency, the projection directions forming between them an angle of substantially coplanar displacement of the resolution angle, the displacement angle being equal to a fraction of the beam resolution angle. Dispositif selon la revendication 1, caractérisé en ce que l'angle de déplacement est sensiblement égal à la moitié de l'angle de résolution.Device according to claim 1, characterized in that the displacement angle is substantially equal to half the resolution angle. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'actionneur mécanique (5) est configuré pour déplacer l'élément de sorte que la fréquence de déplacement de l'axe optique (4) soit une fréquence non perceptible par l'oeil humain.Device according to claim 1 or 2, characterized in that the mechanical actuator (5) is configured to move the element so that the frequency of displacement of the optical axis (4) is a frequency not perceptible by the eye human. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'actionneur mécanique (5) est configuré pour déplacer l'élément de façon discontinue de sorte que l'axe optique (4) du faisceau lumineux (13) est maintenu dans chaque direction de projection pendant un temps de maintien qui est supérieur au temps de transition entre les deux directions de projection.Device according to any one of the preceding claims, characterized in that the mechanical actuator (5) is configured to move the element discontinuously so that the optical axis (4) of the light beam (13) is maintained in each direction of projection during a hold time which is greater than the transition time between the two projection directions. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les sources de lumière (2) sont activables individuellement à une fréquence d'activation définie afin de moduler le faisceau lumineux projeté (13) de façon à produire une zone d'ombre (21) mobile dans le faisceau lumineux (13).Device according to one of the preceding claims, characterized in that the light sources (2) are individually activatable at a defined activation frequency in order to modulate the projected light beam (13) so as to produce a shaded area. (21) movable in the light beam (13). Dispositif selon les revendications 5, caractérisé en ce que la fréquence d'activation des sources de lumière (2) et la fréquence de déplacement l'axe optique (4) sont synchronisées.Device according to claim 5, characterized in that the activation frequency of the light sources (2) and the displacement frequency of the optical axis (4) are synchronized. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend un système optique configuré pour former en partie le faisceau lumineux (13) à partir des rayons lumineux provenant des sources de lumière (2).Device according to any one of the preceding claims, characterized in that it comprises an optical system configured to partially form the light beam (13) from the light rays coming from the light sources (2). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le réseau de sources de lumière (2) est une matrice de diodes électroluminescentes.Device according to any one of the preceding claims, characterized in that the light source array (2) is a matrix of light-emitting diodes. Dispositif selon l'une quelconque des revendications précédentes, comprenant des moyens formant lentille de projection (3), les moyens formant lentille de projection (3) étant aptes à former en partie le faisceau lumineux (13).Apparatus according to any one of the preceding claims, comprising projection lens means (3), the projection lens means (3) being adapted to partially form the light beam (13). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'actionneur mécanique (5) est apte à déplacer en translation le réseau de sources de lumière (2).Device according to any one of the preceding claims, characterized in that the mechanical actuator (5) is able to move in translation the light source array (2). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'actionneur mécanique (5) est apte à déplacer en rotation le réseau de sources de lumière (2).Device according to any one of the preceding claims, characterized in that the mechanical actuator (5) is able to rotate the network of light sources (2). Dispositif selon la revendication 9, caractérisé en ce que l'actionneur mécanique (5) est apte à déplacer en rotation conjointement les moyens formant lentille de projection (3) et le réseau de sources de lumière (2).Device according to claim 9, characterized in that the mechanical actuator (5) is able to jointly rotate the projection lens means (3) and the light source array (2). Dispositif selon la revendication 9, caractérisé en ce que l'actionneur mécanique (5) est apte à déplacer en translation les moyens formant lentille de projection (3).Device according to claim 9, characterized in that the mechanical actuator (5) is able to move in translation the projection lens means (3). Dispositif selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'il comprend un miroir (9) configuré pour réfléchir le faisceau lumineux (13), l'actionneur mécanique (5) étant apte à déplacer le miroir (9).Device according to any one of claims 1 to 9, characterized in that it comprises a mirror (9) configured to reflect the light beam (13), the mechanical actuator (5) being able to move the mirror (9) . Module optique (8) comprenant un dispositif de projection d'un faisceau lumineux à actionneur mécanique selon l'une quelconque des revendications précédentes.Optical module (8) comprising a device for projecting a light beam with a mechanical actuator according to any one of the preceding claims. Projecteur de véhicule automobile comprenant un module optique (8) selon la revendication précédente.Motor vehicle headlight comprising an optical module (8) according to the preceding claim.
EP18163462.7A 2017-03-31 2018-03-22 Device for projecting a light beam with mechanical actuator, optical module and headlight provided with such a device Active EP3382266B1 (en)

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