EP3470728A1 - Leuchtmodul für kraftfahrzeug - Google Patents

Leuchtmodul für kraftfahrzeug Download PDF

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Publication number
EP3470728A1
EP3470728A1 EP18198510.2A EP18198510A EP3470728A1 EP 3470728 A1 EP3470728 A1 EP 3470728A1 EP 18198510 A EP18198510 A EP 18198510A EP 3470728 A1 EP3470728 A1 EP 3470728A1
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EP
European Patent Office
Prior art keywords
light
light sources
imaging device
object focal
focal surface
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.)
Pending
Application number
EP18198510.2A
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English (en)
French (fr)
Inventor
Sebastien ROELS
Marie Pellarin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
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Valeo Vision SAS
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Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP3470728A1 publication Critical patent/EP3470728A1/de
Pending legal-status Critical Current

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    • 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
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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
    • F21S41/10—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
    • 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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • 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
    • F21S41/19—Attachment of light sources or lamp holders
    • F21S41/192—Details of lamp holders, terminals or connectors
    • 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
    • F21S41/26—Elongated 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/322—Optical layout thereof the reflector using total internal reflection
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/323—Optical layout thereof the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
    • 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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • 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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • 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
    • F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
    • F21Y2107/10—Light sources with three-dimensionally disposed light-generating elements on concave supports or substrates, e.g. on the inner side of bowl-shaped supports
    • 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
    • F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
    • F21Y2107/70—Light sources with three-dimensionally disposed light-generating elements on flexible or deformable supports or substrates, e.g. for changing the light source into a desired form
    • 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 invention relates to the technical field of lighting light modules for a motor vehicle.
  • Light modules of this type are already known. They are able to emit longitudinally forwards a segmented light beam.
  • the illumination device comprises a matrix of elementary light sources which is projected forward by an imaging device to form the segmented light beam into a matrix of light pixels. Each bright pixel is illuminated by an associated light source.
  • the light sources are likely to be activated in a individual and independent. By selectively switching on or off each of the elementary light sources, it is possible to create a light beam that specifically illuminates certain areas of the road in front of the vehicle, while leaving other areas in the dark.
  • Such an optical lighting module is used in particular to perform an adaptive lighting function also called "ADB", acronym for the English expression "Adaptive Driving Beam”.
  • ADB adaptive lighting function
  • Such an ADB function is intended to automatically detect a user of the road likely to be dazzled by a beam of light emitted in high beam mode by a projector, and to change the outline of this beam of light in such a way as to create a shadow zone at the location of the detected user while continuing to illuminate the road with a long-range beam on either side of the user.
  • the advantages of the ADB function are multiple: comfort of use, better visibility compared to a lighting in dipped beam mode, risk of dazzling greatly reduced, driving safer ...
  • Such an optical module generally comprises a matrix of light sources, generally formed by light-emitting diodes (LEDs), and an imaging device.
  • the light-emitting diodes are arranged on the surface of a planar substrate which extends in a plane orthogonal to the main emission direction of the light-emitting diodes.
  • Each light source is imaged by the projection optics to form a light pixel.
  • Each luminous pixel can be illuminated selectively by activation or deactivation of each light source.
  • Such an optical module is, however, likely to be subjected to optical aberrations such as spherical aberration, coma aberration, distortion aberration, astigmatism, field curvature aberration, etc.
  • the present invention relates more particularly to the resolution of the problems posed by the field curvature aberration also called "Petzval field curvature".
  • the imaging device is assumed to have an object focal surface formed by a plane orthogonal to the optical axis of said optics.
  • this object focal surface actually has a concave spherical curvature.
  • the light sources of the matrix are arranged in a plane orthogonal to the optical axis of the projection optics, only the secondary elementary light sources located on the curved object focal surface are projected clearly.
  • the other light sources situated in front of or behind the curved object focal surface will be projected in a more or less fuzzy manner according to their longitudinal distance with respect to the object focal surface. The further away the light source is from the object focal surface, the brighter the associated light pixel will be.
  • the matrix of light sources generally has a horizontal dimension much greater than its vertical direction.
  • the light sources arranged at each end of a line are sufficiently far away from the object focal surface so that the curvature defect has visible effects on the corresponding luminous pixels.
  • the defect of curvature thus has troublesome effects on the horizontal lines of luminous pixels, while the effects on the vertical columns of luminous pixels are hardly perceptible to the naked eye.
  • the primary optical element comprises for example light guides, each of which is associated with a light source.
  • the exit faces of the light guides are arranged on a curved surface matching the curvature of the real object focal surface of the projection optics.
  • the device imaging then projects an image of the exit faces of the light guides.
  • the input faces of the light guides are arranged in the same plane.
  • the light guides located transversely at a distance from the optical axis of the projection optics have a length greater than that of the light guides located near the optical axis.
  • Such a primary optical element is not easy to manufacture because of the variable lengths of the light guides.
  • the length of the light guides at the ends of the primary optical element is such that the choice of material for producing the primary optical element is limited, for example, to silicone. It is particularly very complex and extremely expensive to make light guides polycarbonate or PMMA.
  • Such a shape of the substrate makes it possible to arrange each light source of a line at a single distance from the first focussing surface object of the imaging device.
  • the luminous pixels obtained by projection of the light sources of the same line have substantially the same light intensity profile regardless of their position along the line.
  • a luminous pixel located at the end of the line will have substantially the same distribution of light intensity as a luminous pixel situated in the middle of the line.
  • the substrate which carries the matrix of light sources is flexible at least in a horizontal plane to adapt its radius of curvature to the radius of curvature of the first object focal surface.
  • the substrate can be bent under stress and it resumes its original shape when the stress is removed.
  • the substrate can take a flat shape in its unconstrained state.
  • the substrate is also flexible in a vertical plane to form a sphere portion after deformation.
  • the imaging device comprises an input face of the light rays, the imaging device being designed so that the first object focal surface has a determined radius of curvature so that, in projection in a horizontal plane, the circle virtually extending said first object focal surface passes through the end edges of the input face of the light rays.
  • the light sources are merged with the first focal surface object of the imaging device.
  • This variant is particularly interesting when the light sources of the same line are substantially contiguous.
  • the light sources are shifted rearwardly with respect to the first focal surface object of a specific offset distance.
  • the offset distance is defined so that a cone whose base rests on the circumference of the input face of the imaging device and whose vertex is located on the intercepts focus, in the extension of its summit, a segment whose length is equal to the distance between the center of two consecutive light sources of the same line.
  • the imaging device comprises a single object focal surface which is formed by said first object focal surface.
  • the vertical distance separating two adjacent light sources of the same column is substantially equal to the horizontal distance separating two adjacent light sources of the same line so that, in the light beam, the Bright lines of bright pixels overlap vertically.
  • the vertical distance separating two adjacent light sources of the same column is greater than the horizontal distance separating two adjacent light sources of the same line so that, in the light beam, the lines bright luminous pixels appear distinctly from each other with vertical interposition of darker intervening lines.
  • the invention also relates to a segmented light beam projector for a motor vehicle which comprises two light modules each produced according to the invention, the lines of light pixels of a light beam being interposed between the lines of light pixels. from the other light beam to create a homogeneous overall light beam.
  • the imaging device comprises a second object focal surface, the first objective focal surface focusing the light rays in a horizontal plane, and the second object focusing surface focusing the light rays in a plane.
  • the light module comprising a primary optical element which shapes the light rays emitted by the light sources to obtain vertically adjacent secondary light sources which are arranged in coincidence or near the second object focal surface.
  • a local coordinate system linked to the light module having longitudinal orientations, oriented from rear to front and corresponding to the normal direction of movement of the vehicle, vertical, oriented from bottom to top, and transverse, oriented from left to right indicated by the trihedron "L, V, T" of the figures.
  • the vertical orientation is used here as a geometric reference for the description of the light module, unrelated to the direction of gravity.
  • the vertical and transverse orientations are independent of a reference linked to the vehicle.
  • the transverse orientation extends from one wing to the other of the vehicle parallel to the road, while the vertical orientation extends orthogonally to the road, from the wheels to the roof of the vehicle.
  • the light module can also be arranged in the vehicle so that the vertical and transverse orientations are rotated about the longitudinal axis relative to the vehicle.
  • FIG. 1 a motor vehicle 10 equipped with a projector 12 which produces a light beam 14 segmented into light pixels which performs a specific lighting function. Without limitation, this is a high beam function.
  • the light beam 14 is emitted along a substantially longitudinal transmission axis "A" toward the front of the vehicle 10.
  • a vertical transverse screen 16 has been arranged at a determined longitudinal distance in front of the vehicle 10.
  • the screen 16 is here arranged at 25 m from the vehicle.
  • a transverse axis "H” and a vertical axis “V” intersecting at the axis "A” of emission of the light beam 14 have been drawn on the screen 16.
  • the axes "H” and “V” are graduated in degree of opening of the light beam.
  • the light beam 14 illuminates an area 18 of the screen 16.
  • This illuminated area 18 is divided into a matrix of juxtaposed light pixels 20 which are arranged in transverse lines and in vertical columns.
  • the bright pixels 20 are individually activatable and independently of each other.
  • juxtaposed means that two adjacent bright pixels 20 vertically or transversely overlap each other.
  • the light beam 14 substantially homogeneously illuminates the area 18 of the screen 16.
  • a light pixel 20 is off, a portion of the space it occupies on the Screen 16 is not lit by neighboring pixels.
  • each light pixel 20 has a bell-shaped light intensity profile along a section line.
  • the overlap of two luminous pixels 20 is defined by the fact that the light profiles of two successive luminous pixels along a line, for example transverse, intersect.
  • the figure 3 gives a non-limiting example of overlapping luminous pixels 20.
  • the figure 3 represents the light intensity profiles of three adjacent 20A, 20B, 20C light pixels projected onto the screen 16.
  • Each light pixel 20A, 20B, 20C has a bell-shaped light intensity profile, the maximum light intensity Imax being located in the center of the light pixel 20A, 20B, 20C.
  • the left light pixel 20A overlaps the central light pixel 20B so that the light intensity curves intersect at a "P1" point having a luminous intensity substantially equal to half of the maximum luminous intensity Imax.
  • the right light pixel 20C overlaps the central light pixel 20B so that the light intensity curves intersect at a point "P2" having a light intensity substantially equal to half the maximum light intensity Imax.
  • a central band comprising the top of the bell is illuminated only by the central light pixel 20B, and this central band is surrounded by degraded and low intensity light bands, which extend from the central band respectively to the points P1. and P2.
  • each luminous pixel has a luminous profile approaching a slot shape in which the top of the bell is spread out to substantially form a plate.
  • the crossing between two light intensity profiles of two successive luminous pixels is at a light intensity less than half of the maximum intensity.
  • the space occupied by a given light pixel is likely to be fully illuminated by the adjacent luminous pixels.
  • the projector 12 comprises at least one light module 22.
  • the light module 22 comprises at least one matrix 24 of light sources 26 and at least one imaging device 28 which is designed to project the light sources forming the light beam 14 in which each light source 26 produces a light pixel 20.
  • the light sources 26 are here all identical in size.
  • the light sources 26 are formed by light-emitting diode-emitting surfaces. They are all arranged on a front face 29 of a common substrate 30.
  • the common substrate 30 has a plate shape which extends in a generally vertical transverse plane
  • all the light sources 26 are arranged in the same plane parallel to or coincident with the face 29.
  • the light emitting diodes protrude from the face 29, they all project from the same distance.
  • the light sources 26 are arranged in horizontal lines 32 and in vertical columns 34.
  • the matrix 24 here has a greater number of columns 34 than 32 lines. As a result, the matrix has a transverse width much greater than its vertical height.
  • two adjacent light sources 26 of the same line 32 are spaced apart by a first transverse distance "D1".
  • the transverse distance "D1" is the same for all the light sources 26 of the same line 32.
  • two adjacent light sources 26 of the same column 34 are spaced apart by a second vertical distance "D2".
  • the vertical distance "D2" is the same for all light sources of the same column 34.
  • the light module 22 comprises at least one imaging device 28 which is designed to project an image of each light source 26 substantially to infinity.
  • the imaging device 28 is especially designed to project the light sources 26 by forming the light beam 14 in which each light source 26 produces a light pixel 20.
  • the imaging device 28 is in the form of a single lens. It will be understood, however, that the imaging device may also comprise at least one reflecting element and / or one or more lenses.
  • the imaging device 28 has an input face 36 of the light rays and an output face 38 of the light beam 14.
  • the imaging device 28 has at least a first focal length F1 and a first generally transverse vertical object focal surface 40 which is arranged substantially in coincidence with the light sources 26.
  • the first object focal surface 40 is arranged in such a way that, when all the light sources 26 of a line 32 are activated, the screen 16 is illuminated homogeneously by a corresponding luminous line of light pixels 20.
  • the object focal surface 40 of the imaging device 30 is represented in first approximation by an objective focal surface 40 which is plane and perfectly orthogonal to the optical "A" axis.
  • the projection optic 14 has an object focal surface having a concave spherical curvature defect.
  • Such a defect is called Petzval field aberration.
  • the curvature defect has a radius of curvature of radii of curvature determined.
  • the first object focal surface 40 appears as a circular arc.
  • the invention proposes that the substrate 30 of the matrix 24 has, in a horizontal plane, a curved shape at least partly parallel to the first focal surface object 40 of the imaging device 28.
  • the portion of the substrate 30 comprising the light sources 26 may have, in a horizontal plane, a curved shape parallel to the first object focal surface 40 of the imaging device 28 while the ends of the substrate 30 located on either side of the portion of the substrate 30 comprising the light sources 26 may have, in this same horizontal plane, a shape parallel or not to the first object focal surface 40 of the imaging device 28.
  • the entire substrate 30 of the matrix 24 has, in a horizontal plane, a curved shape parallel to the first object focal length 40 of the imaging device.
  • the substrate 30 is thus curved so that its front face 29 has a cylindrical sector shape of vertical generatrices and direction in a horizontal arc.
  • the radius of curvature of the substrate 30 is determined so that each line 32 of light sources 26 is parallel to the object focal surface 40 taken along a horizontal sectional plane passing through said line 32.
  • all the light sources 26 of a same line 32 are arranged at the same distance from the first object focal surface 40.
  • the substrate 30 carrying the matrix 24 of light sources 26 is flexible at least in a horizontal plane to precisely adapt its radius of curvature to the radius of curvature of the first object focal surface 40.
  • the substrate 30 is for example elastically flexible, the front face 29 of the substrate 30 having a planar shape in its unstressed state, as shown in broken lines at the figure 6 . This makes it possible to precisely adjust the radius of curvature of the substrate 30 to the defect of curvature of the associated imaging device 30.
  • the die 24 is mounted on a frame which makes it possible to adjust its radius of curvature.
  • the frame comprises for example two clamping jaws 35 which are each arranged against a vertical edge of the substrate 30 and transversely clamping the substrate 30 to constrain it to the desired curved position.
  • the frame has a curved bearing surface against which a rear face of the substrate 30 is fixed, for example by gluing or elastic interlocking or by any other suitable fastening means.
  • the transverse distance "D1" between two adjacent light sources 26 of the same line 32 is not zero.
  • the transverse distance "D1" is between 10% and 50% of the width of a light source 26.
  • the surface focal length object 40 is shifted longitudinally forward a longitudinal distance "D3" with respect to the nearest light sources 26, as shown in FIG. figure 6 .
  • This allows the light source 26 to be imaged by a slightly blurred and more transversely spreading light pixel 20 which overlaps the adjacent pixels 20, thereby removing the dark spaces between two transversely adjacent light sources 26.
  • the radius of curvature of the substrate 30 is equal to the sum of the radius of curvature of the first object focal surface 40 and the longitudinal distance "D3" of offset.
  • the offset distance "D3" is defined so that a cone 43 whose base is supported on the circumference of the input face 36 of the imaging device 28 and whose apex is located on the focus of the device In the extension of its apex, the imaging circuit 28 intercepts a segment whose length is equal to the distance between the center of two consecutive light sources 26 of the same line 32. It will be noted that the opening angle " ⁇ of the cone 43 corresponds to the opening angle of the imaging device 28.
  • a virtual "C” circle is defined which is formed by extending the first object focal plane 40.
  • the imaging device 28 is advantageously designed so that the first object focal plane 40, projected into an axial horizontal plane, has a radius of curvature determined so that the circle “C” passes through the end edges of the input face 36 of the light rays, as illustrated in FIG. figure 7 .
  • the end edges of the input face 36 define an arc 41 of the circle “C”.
  • the so-called “inscribed angle” theorem states that an angle inscribed in the circle “C” which intercepts said arc 41 has the same value " ⁇ " regardless of the position of its vertex on the circle “C”.
  • the angle " ⁇ " corresponds to the opening angle of the imaging device 28.
  • This configuration thus makes it possible to very substantially improve the light output of the light sources 26 arranged at the end of line 32 with respect to a light module in which the light sources are arranged on a plane substrate. This configuration also avoids vignetting optical aberrations.
  • the imaging device 28 has a single object focal surface which is formed by said first object focal surface 40.
  • the matrix 24 of light sources 26 is designed so that the vertical distance "D2" separating two adjacent light sources 26 of the same column 34 is substantially equal to the horizontal distance "D1" separating two adjacent light sources 26 of the same line 32.
  • the light beam 14 illuminates the screen 16 so that the light lines of light pixels 20 overlap vertically, in the same way as two light pixels 20 of the same line 32.
  • the light beam 14 thus illuminates homogeneous screen 16.
  • the die 24 has, in vertical axial section, a rectilinear shape, while the first object focal surface 40 has a shape of an arc of a circle.
  • this configuration is not a problem since, as explained above, the vertical dimension of the matrix 24 is much smaller than its transverse dimension. As a result, the blur created by the effect of the curvature of the field is not perceptible to the naked eye on the luminous pixels 20 of the same column.
  • the invention proposes a variant of this first embodiment which is represented in FIGS. figures 9 and 10 .
  • the vertical distance "D2" separating two adjacent light sources 26 of the same column 34 is greater than the horizontal distance "D1" separating two sources adjacent luminaires 26 of the same line 32 so that, in the light beam 14A, the lines 42A of bright pixels 20 appear distinctly from each other with the interposition of darker interposed lines, as shown in FIG. figure 9 .
  • the projector 12 then comprises two light modules 22A, 22B similar.
  • the second light module 22B is arranged to project a light beam 14B having lines 42B of light pixels 20 between the lines 42A of light pixels of the other light beam 14A to create a homogeneous overall light beam.
  • the two light modules 22A, 22B are here arranged in the same projector 12.
  • the projector 12 comprises a housing 44 common closed by an ice 46 enclosing the two light modules 22A, 22B.
  • the invention proposes a second embodiment of the invention which is represented in FIGS. figures 11 and 12 .
  • the imaging device 28 is a bifocal device, sometimes also called astigmatism, which comprises, besides the first object focal surface 40, a second object focal surface 48.
  • the second object focal surface 48 is arranged at a focal length "F2" with respect to the optical center of the imaging device 28.
  • the first object focal surface 40 focuses the light rays in a horizontal plane, while the second object focal surface 48 focuses the light rays in a vertical plane.
  • the light module further comprises a primary optical element 50 which shapes the light rays emitted by the light sources 26 to obtain light sources. vertically adjoining secondary members which are arranged on the second object focal surface.
  • the primary optical element 50 is an optical part, or a set of parts and / or optical structures, arranged to transfer the light emitted by said light sources 26 onto a virtual projection surface, which is opposite and at a distance predefined of the matrix 24, in the direction of the emission of light, to form the secondary light sources 52.
  • the virtual surface is advantageously a virtual concave surface in the form of a parallel sphere portion or coincident with the second object focusing surface 48.
  • the virtual projection surface may be a cylinder portion parallel to the front face of the matrix 24.
  • each secondary light source 52 has a height greater than that of each associated light source 26.
  • the secondary light sources 52 are here joined vertically.
  • the primary optical element 50 may be made in a single optical part but may comprise at least two optical parts which may have different shapes and / or refractive indices.
  • the at least two pieces may also be made of different materials and may include coatings for improving light transmission efficiency, such as an antireflection coating.
  • the primary element 50 may comprise diffractive or refractive structures, such as diffraction gratings or Fresnel structures.
  • the primary optical element 50 comprises several layers of light guide 54 each of which is arranged facing a line 32 of associated light sources 26.
  • a guide sheet 54 is defined as an optical part capable of guiding light by total internal reflection of this light, for example from an entrance face to an exit face.
  • a guide sheet 54 has a small thickness compared to its length and its width.
  • each guide ply 54 has an upper face 56 and an underside 58 of extended guide separated by a periphery. This circumference defines a thickness of the guide ply 56, which may be variable, for example increasing from one end to the other.
  • the periphery comprises a vertical rear transverse face 60 input of light common to all light sources 26 of the associated line 32. The rear face 60 input is arranged near the associated light sources 26, for example a few millimeters.
  • the light emitted by the light sources 26 which enters through the rear face 60 propagates inside the guide ply 60 by successive total internal reflections against the upper and lower faces 56, 58 towards a front transverse face 62 vertical exit.
  • the front face 62 forms a portion of the periphery of the guide ply 54.
  • each guide ply 54 has a height greater than that of its inlet face 60.
  • each guide ply 54 has, in transverse longitudinal section, a profile diverging from its inlet face 60 to its outlet face 62.
  • the input face 60 has a height that is substantially equal to the height of the emission surface of the associated light sources 26.
  • the exit face 62 is thus illuminated over its entire height by the associated light sources 26, thus forming a line of secondary light sources 52.
  • the first object focusing surface 40 of the imaging device 28 is arranged in the same manner as in the previous embodiments, that is to say in coincidence or near the light sources 26.
  • the second focussing surface object 48 which is arranged substantially in coincidence with the outlet faces 62 of the guide plies 54.
  • each light source 26 arranged substantially close to the first object focusing surface 40 the light rays emitted by the emission surface of said light source 14 are projected parallel by the imaging device 28 in vertical planes. longitudinal, so that the light beam associated with said light source 26 creates a light segment of generally rectangular shape transversely delimited by vertical edges which are the sharp image of the vertical edges of the emission surface.
  • each light source 26 creates on the output face 62 of the guide web 20 a secondary light source 52.
  • Each secondary light source 52 is thus delimited vertically by two transverse edges which coincide with the edges formed by the upper faces and lower 56, 58 with the outlet face 62.
  • each secondary light source 52 Since the outlet face 62 is arranged substantially in coincidence with the second object focusing surface 48, the light rays emitted by each secondary light source 52 are thus projected parallel by the imaging device 28 in longitudinal transverse planes, so that the light beam associated with said light source 20 creates a luminous segment of generally rectangular shape delimited vertically by vertical edges which are the image clear of the transverse edges of the secondary light source 52.
  • the secondary light sources 52 being substantially contiguous, the pixels 20 obtained are also vertically joined.
  • the guide web is replaced by reflective surfaces.
  • the space that was occupied by the guide web of the figure 12 is left empty, while the reflective surfaces are carried by prisms 64 which extend longitudinally from their base 66 located on the front face of the substrate 24, between two lines 32 to a free front transverse edge 68.
  • the upper faces 58 and lower 56 of the prisms 64 form reflecting surfaces.
  • the prisms fill exactly the gaps between two guiding layers of the figure 12 .
  • This embodiment operates in the same way as the embodiment of the figure 12 and it provides the same benefits.
  • the pixels obtained are sharper, particularly on the transverse edges of the area illuminated by the light beam.
  • the light output of the module light is substantially improved compared to known designs.

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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)
  • Geometry (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP18198510.2A 2017-10-16 2018-10-03 Leuchtmodul für kraftfahrzeug Pending EP3470728A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1759648A FR3072445B1 (fr) 2017-10-16 2017-10-16 Module lumineux pour vehicule automobile

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EP3470728A1 true EP3470728A1 (de) 2019-04-17

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EP (1) EP3470728A1 (de)
CN (1) CN109668109B (de)
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EP3786518A1 (de) * 2019-08-27 2021-03-03 Seoul Semiconductor Europe GmbH Beleuchtungsvorrichtung
FR3141749A1 (fr) * 2022-11-06 2024-05-10 Valeo Vision Dispositif d’éclairage

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DE112020002482A5 (de) * 2019-05-23 2022-02-17 Osram Opto Semiconductors Gmbh Beleuchtungsanordnung, lichtführungsanordnung und verfahren
CN112443808A (zh) * 2019-08-28 2021-03-05 堤维西交通工业股份有限公司 适应性头灯
FR3103025B1 (fr) * 2019-09-27 2021-12-10 Valeo Vision Dispositif et procede de commande de sources lumineuses matricielles
CN113154331B (zh) * 2020-01-22 2024-01-23 扬明光学股份有限公司 交通工具的投射装置及其制造方法、车前头灯
US11865964B2 (en) * 2020-03-13 2024-01-09 Maxell, Ltd. Optical apparatus, method for manufacturing optical apparatus, and headlight
JP7529981B2 (ja) 2020-07-22 2024-08-07 日亜化学工業株式会社 光源装置
CN113231283B (zh) * 2021-05-10 2023-06-27 上海润立美术设计有限公司 一种点、线、面光源可调式的uv-led固化装置

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Also Published As

Publication number Publication date
CN109668109B (zh) 2021-08-17
US10837613B2 (en) 2020-11-17
US20190113199A1 (en) 2019-04-18
FR3072445A1 (fr) 2019-04-19
FR3072445B1 (fr) 2020-11-13
CN109668109A (zh) 2019-04-23

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