EP1762776B1 - Verfahren zur Herstellung eines Moduls eines Kraftfahrzeugscheinwerfers - Google Patents

Verfahren zur Herstellung eines Moduls eines Kraftfahrzeugscheinwerfers Download PDF

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Publication number
EP1762776B1
EP1762776B1 EP06291391.8A EP06291391A EP1762776B1 EP 1762776 B1 EP1762776 B1 EP 1762776B1 EP 06291391 A EP06291391 A EP 06291391A EP 1762776 B1 EP1762776 B1 EP 1762776B1
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EP
European Patent Office
Prior art keywords
lens
module
light
optical axis
diode
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EP06291391.8A
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English (en)
French (fr)
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EP1762776A1 (de
Inventor
Pierre Albou
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Valeo Vision SAS
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Valeo Vision SAS
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Priority claimed from FR0509234A external-priority patent/FR2890721B1/fr
Priority claimed from FR0602391A external-priority patent/FR2898662A1/fr
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Publication of EP1762776A1 publication Critical patent/EP1762776A1/de
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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
    • F21S41/265—Composite lenses; Lenses with a patch-like shape
    • 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
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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
    • 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 a method of constructing a light projector module giving at least one cut-off beam, for a motor vehicle, of the kind comprising a lens and a light source disposed behind the lens of which it is separated by air, the light source comprising at least one light emitting diode.
  • LED Light-emitting diodes
  • diodes deliver relatively limited light flux, of the order of 100 lumens.
  • LED Light-emitting diodes
  • the outer surface of the projector may have discontinuities in the junction areas of the juxtaposed modules, which is also not desired. The radii of curvature of this outer surface are generally not adapted to those of neighboring body parts, which is not suitable for the style. The fusion of the light beams of the different modules also needs to be improved.
  • the object of the invention is, in particular, to create a lens light projector module that can be assembled in a continuous manner in an extinct aspect to neighboring modules, and that makes it possible to create controlled light beams without constraint of radius of curvature on the surface. output of the overall part forming the projector.
  • the lens module should be able to provide complex forms of beam splitting.
  • LED module and lens that is adaptable to provide different types of beam, including beams, or flat or oblique cut beam portions, such as code beams or beams.
  • beams called motorway beams (or "motorway" in English).
  • the method of constructing a motor vehicle light projector module is such that the exit surface of the lens is chosen so that it can connect smoothly and continuously with the exit surfaces of similar neighboring modules, and determine the entrance surface of the lens so as to obtain the cutoff of the light beam, without using an occulting cover.
  • the term "concealment mask” is understood to mean a mask that intercepts the light that essentially reaches it by absorption (as opposed to a light reflecting element in particular).
  • modules include modules whose external appearance is similar, and which also comprise a lens and at least one light-emitting diode, but which can generate either a cut-off beam or a beam without cutoff (road type).
  • modules can also be modules as defined above but equipped with at least one light emitting diode emitting essentially in the infra-red and not in the visible, this in particular to allow to emit an infra-red beam. Red uninterrupted road-type distribution for night driving assistance.
  • a method of construction of a light projector module giving a cut-off beam for a motor vehicle comprising a lens and a light source disposed behind the lens of which it is separated by air, the light source being formed by at least one electroluminescent diode.
  • the method is such that the exit surface of the lens is chosen and the entrance surface of the lens is determined by relying on a horizontal generatrix, so as to obtain the breaking of the light beam emitted by the module without using an occulting cover, and with a controlled horizontal distribution of said light beam.
  • the exit surface of the lens is selected as being substantially cylindrical or toroidal, the section of the exit surface of the lens being a vertical plane parallel to the optical axis being convex forward.
  • curvature (s) of the exit surface of the lens substantially equal to the curvature (s) of the walls surrounding the module.
  • the exit surface is advantageously chosen to be that of a cylinder of revolution whose section by a vertical plane passing through the optical axis is a convex circular arc. forward, and the entrance area is constructed to be stigmatic between the second focus of the ellipsoidal reflector and infinity.
  • the output surface is generally chosen toric, vertical axis of revolution, and the input surface is constructed so as to create a horizontal cut.
  • the invention also relates, according to one embodiment of the module, to a motor vehicle headlight module comprising a lens and, behind the lens, a light source separated from the lens by air and formed by minus a light-emitting diode, this module being such that the exit surface of the lens is entirely convex forward and is such that it can be connected in a smooth, continuous surface with the lens exit surfaces of similar neighboring modules , and the input surface of the lens is defined so that the module gives a light beam cut without intervention of an occulting cache, including vertical.
  • a light projector module giving a cut-off beam for a motor vehicle, comprising a lens and a light source disposed behind the lens from which it is separated by air, the light source comprising at least one light-emitting diode, such that the exit surface of the lens is fully convex forward, and the entrance surface (Ae1-Ae5) of the lens is defined based on a generator horizontal, so that the module gives a light beam cut without intervention of an occulting cover, including vertical, and with a horizontal distribution.
  • the entrance surface (Ae6) of the lens is calculated so that a family of light rays, called limit radii, emanating from the emitter of the light source, emerge from the lens so that they are all normal, at the points where they meet, to a surface, said output wave surface, cylindrical, vertical generators and any cross section (the choice of a straight section or more generally, a director of the output waveform makes it possible to control the horizontal distribution of the energy in the beam and here replaces the choice of the "generating curve" of the preceding variant).
  • the limit radii are chosen so that all the other light rays coming from the source reaching the entrance face of the lens at the same point as they emerge from the exit face (As6) with a direction vector of vertical component negative or zero.
  • the generated beam has a horizontal cutoff line and all images of the transmitter meet this limit line at infinity at one point.
  • the lens input surface is generally discontinuous, the points (called foci) of the emitter from which the limit rays are derived being different depending on the point of emergence of the beam. limit on the surface of the source reaches the entrance face of the lens at a point above or below (along the vertical axis z) of it.
  • the physical part comprises a continuous surface made up of the above-mentioned high and low surfaces and a connection surface, ideally set, with generatrices parallel to the optical axis, and, in practice, inclined generatrices. relative to this axis so as to allow demolding of the lens.
  • variant II ⁇ lies in the possibility of calculating the output area (in two parts) directly (one equation for each point, independent of the neighboring points) and not step by step, which causes the propagation of the errors of calculations and possibly numerical oscillations.
  • choice of the output wave surface imposes precisely the direction of the highest radius of each image according to its point of emergence at the exit surface of the lens, while the "generating curve" of the preceding variant constitutes only one of the boundary conditions for a system of partial differential equations and, if it makes it possible to control the horizontal distribution of the energy, can not be directly connected to the horizontal position of a image from a given point of the exit surface.
  • the exit surface of the lens may be cylindrical or toric, the section of the exit surface of the lens by a vertical plane parallel to the optical axis being convex forwards.
  • the curvature (s) of the exit surface of the lens may be substantially equal to the curvature (s) of the walls surrounding the module on the vehicle.
  • the light projector module may comprise an ellipsoidal reflector and a folder, in which case the exit surface is advantageously chosen to be that of a cylinder of revolution whose section by a vertical plane passing through the optical axis is an arc of a circle. convex forward, and the entrance surface is constructed to be stigmatic between the second focus of the ellipsoidal reflector and the infinite.
  • the shape of the edge of the folder may be provided for the beam bright has a V cut.
  • the edge of the folder may have valley deformation to compensate, in part, for the aberrations of the lens.
  • the edge of the folder may have on both sides of the vertical plane passing through the optical axis two bumps connected by a portion in bowl to form an additional module for a highway code, strengthening the light in the axis below from the horizontal.
  • the input surface is such that the optical path is constant from the external focus of the reflector, to a plane tangential to the exit face at its point of intersection with the optical axis of the module.
  • the focus of the lens is offset transversely with respect to the optical axis and the module illuminates in a lateral direction with respect to the optical axis, the input surface of the lens being such that the optical path is constant between the focus of the lens and a vertical plane whose trace on the horizontal plane of the optical axis is inclined relative to this axis.
  • the output surface of the lens is selected toric of vertical axis of revolution, and the input surface is defined to give a beam cutoff horizontal.
  • the light source may consist of a rectangular lambertian emitter placed in a vertical plane, orthogonal to the optical axis, or by a light-emitting diode having a transparent protective dome located above the emitter, itself placed in the light source. 'air.
  • the module comprises a light-emitting diode in direct view of the lens, said diode being disposed in an oblique plane with respect to the optical axis of said module.
  • a light-emitting diode is preferably chosen having a transparent protective dome located above the emitter.
  • the diode is sufficiently inclined so that the angle under which is seen the emitter of the diode from a majority of points (corresponding to at least 75% of the input area for example) of the lens is smaller than what it would be with a lens arranged in a plane perpendicular to the optical axis of the module.
  • Another favorable condition is to choose the inclination of the diode so that the radius most inclined relative to the axis of the emitter of the diode reaching the lens is lower than the limit angle of the distribution of the light beam emitted by the diode. This prevents a zone of the lens from receiving more light from the transmitter.
  • An appropriate inclination is for example an angular deviation with respect to the optical axis of the module of the order of +/- 35 ° to +/- 55 °, in particular from +/- 40 ° to +/- 50 °, by example of + 45 ° or - 45 °.
  • the module by tilting the diode, it is easy to obtain with the module a beam or a portion of the motorway-type beam, in particular having a beam thickness of less than 5%, (corresponding to 2.852 °), in particular less than 3% (which corresponds to 1.718 °), a high intensity, in particular at least 40 lux at 25 meters, and a cut above the horizontal part of the cut of the code beam.
  • This cut is clear and is naturally below the glare limit defined in the relevant regulations.
  • the module may comprise a light source including a light-emitting diode in direct view of the lens, the module being such that, in the mounting position, the emitter of the diode and the lens are inclined both laterally in a vertical plane, in particular to obtain a beam or a portion of obliquely cut light beam.
  • the invention also relates to a light projector giving a cut-off beam, for a motor vehicle, as it is formed by an assembly of several modules as defined above, juxtaposed so that the output surface of the projector optics is smooth, continuous.
  • the luminous headlight is advantageously constituted by several superimposed rows of assembled modules, some of the modules providing a 15 ° cut, other modules being able to illuminate laterally, each extinguished row having the external appearance of a single cylindrical rod or a continuous ring segment.
  • the invention also relates to any module assembly, which assembles a plurality of modules, at least one of which provides an oblique cutoff as described above, with other similar modules capable of emitting an unbroken beam and possibly with similar modules. can illuminate laterally. It is thus possible to insert into a projector one or more rows associating dedicated modules code with dedicated road modules in the visible and / or road in the infra-red, keeping an external appearance unit very interesting for the style of the projector in general.
  • the invention also relates to any unitary module for making a beam or a beam portion with horizontal or oblique cut. If it is intended to emit a beam portion, it may be supplemented by another complementary beam, emitted by a different module and already known, using for example conventional light sources of halogen or xenon type.
  • a light projector module for a motor vehicle comprising a lens La, Lb, Lc, Ld, Le and a light source formed by at least one light emitting diode Da, Db, Dc, Dd, De disposed rearwardly of the lens.
  • An air space separates the diode from the lens.
  • forward and backward are to be considered in the direction of propagation of the luminous flux from the source to the lens, and the module is to be considered in the position it occupies on the vehicle, ie with its horizontal optical axis.
  • the procedure is as follows.
  • the output area As1, As2, As3, As4, As5 of the lens La, Lb, Lc, Ld, Le is chosen so that it can be connected in a smooth, continuous surface with the exit surfaces of adjacent modules. Similar.
  • This outlet surface is furthermore chosen so as to have a curvature adapted, preferably substantially equal, to that of the walls W ( Fig.1 ) that surround it, including the walls of the vehicle body.
  • the exit surface is fully convex forward.
  • the entrance surface Ae1, Ae2, Ae3, Ae4, Ae5 of the lens is determined so as to obtain, without a vertical cover, a light beam with cutoff with spreading of the light.
  • the case of the cylindrical surface can be considered as the case particular of a toric surface whose axis of revolution is at infinity.
  • the exit surface of the lens has a horizontal plane of symmetry passing through the optical axis of the module; the section of the exit surface, cylindrical or toric, by a vertical plane passing the optical axis is a forward convex circular arc.
  • the radii of curvature in a horizontal plane and in a vertical plane of the exit surface of the lens are freely chosen to match the curvatures of the walls W surrounding the module.
  • the module comprises an ellipsoidal reflector Ma, Mb having two foci, namely an internal focal point in the vicinity of which the light source is located and an external focus coinciding with the focus of the lens or neighboring this focus.
  • the light source does not directly illuminate the input face of the lens, but illuminates towards the reflector, substantially at right angles to the optical axis of the module.
  • a folder Na, Nb is located in the horizontal plane passing through or near the optical axis of the module. The front edge of the folder goes through the focus of the lens.
  • the light source is in direct view of the entrance face of the lens, without the intervention of a reflector or a folder.
  • a projector Ea can be seen having a light source constituted by at least one LED Da whose maximum emission point is preferably located at the internal focal point Bi of the ellipsoidal reflector Ma.
  • the external focus Be is located in front of Bi .
  • the reflector Ma corresponds substantially to the upper rear quarter of an ellipsoid of revolution whose geometric axis coincides with the optical axis Oy of the module and the lens La, located in front of the external focus Be.
  • the diode Da is oriented so as to illuminate substantially upwards, substantially at right angles to the optical axis Oy, towards the reflector Ma.
  • the rays from Bi are reflected to converge towards the focus Be confused with the focus of the lens.
  • the module further comprises a folder Na, that is to say a plate whose upper surface is reflective, located in a horizontal plane passing through the optical axis Oy and whose front edge 10 passes through the focus Be, and determines the cutoff line of the light beam.
  • the illumination is below the image of this edge given by the lens La.
  • the outlet area As1 is chosen so that it can be connected in a smooth, continuous surface with adjacent similar module exit surfaces, while having a curvature adapted to the surrounding walls W.
  • the entrance surface Ae1 of the lens is determined so as to obtain a light beam with cut-off of the light.
  • the surface Ae1 is constructed to be stigmatic between the second focus Be of the reflector Ma and the infinite.
  • Ae1 is such that a light ray r1 coming from the focus Be and propagating in the air, after entering the lens La and refraction along r2, leaves the surface As1 along a radius r3 parallel to the optical axis Oy.
  • the optical path is constant between the focus Be and a plane II1 tangent to the output face As1 at its intersection point h1 with the optical axis of the module.
  • the exit surface As1 is chosen to be that of a cylinder of revolution of horizontal geometric axis, orthogonal to the optical axis. (It could also be of substantially toric shape).
  • the section of the surface As1 by the vertical plane of the Figure 4 is an arc having its center at the point ⁇ located on the optical axis Oy, in front of the outer focus Be, the generatrices being perpendicular to the plane of Fig.4 .
  • the three-dimensional construction is then done in all vertical planes parallel to the Oyz optical axis.
  • LEDs may be arranged parallel to the generatrices of the exit surface.
  • the successive front edges 10 of the folders of the different modules are aligned parallel to the generatrices of the cylindrical surface As1.
  • a lens with cylindrical exit surface As1 has aberrations that can be partially offset by a modification of the shape of the edge of the folder 10 by providing a deformation 11 (FIG. Fig.3 ) in the form of a bump, preferably in a vertical plane.
  • Fig. 3 illustrates a form of folder with a branch rising substantially rectilinear to the right, and a branch with breakage of slope on the left.
  • the edge 10a of the folder has on both sides of the vertical plane 12 passing through the optical axis two bumps 13,14 connected by a portion 15 in a bowl.
  • the bumps 13,14 extend on both sides by 16,17 depression areas that go back to reach the edge located in the horizontal plane passing through the optical axis.
  • Such a module can constitute an additional module for a motorway lighting code which makes it possible to reinforce the light in the axis, below the horizontal.
  • Fig. 7 illustrates the isolux network obtained with the module of Fig. 6 which has a maximum of intensity in the axis, the isolux curves being located below the horizontal intersecting the optical axis, being substantially symmetrical with respect to the vertical plane passing through the optical axis.
  • one or more modules are advantageously provided with an output face identical to that of the modules giving a cutoff at "15 ° »( Fig.5 ), But illuminating in a lateral direction to complete the beam with light under the cut, eg left for right-hand drive country vehicles.
  • Fig.8 a module having a stigmatic lens Lb between a focus point 18, abscissa x F and a vertical plane wave, inclined with respect to the optical axis and whose trace 19 on the horizontal plane is shown.
  • the inclination of the plane wave is intended to promote lighting under the cutoff, on the left.
  • the focal point 18 of the lens Lb is shifted to the right with respect to the straight line Oy passing through the center of the exit face As2.
  • the exit surface As2 of the lens is chosen cylindrical of revolution; its horizontal cut on Fig.8 and 9 is a rectilinear generator.
  • the entrance surface Ae2 of the lens is constructed so that the optical path between the focus 18 and the vertical trace plane 19 is constant.
  • the lens Lb whose horizontal section is visible on Fig.9 , is asymmetrical at its input surface Ae2. From a point G, corresponding to a maximum thickness, situated to the right of the optical axis Oy of the reflector Mb, the lens Lb decreases in thickness to the left less rapidly than to the right.
  • the isolux network obtained with a projector in accordance with the Fig. 9 is illustrated on Fig.10 .
  • the Isolux curves are located below the horizontal passing through the optical axis, and essentially to the left of the vertical plane passing through the optical axis.
  • the light source Dc ( Fig.11 ) is considered to consist of a rectangular lambertian emitter placed in a vertical plane, orthogonal to the optical axis, behind a known primary optic, imposed by the manufacturer of the light-emitting diode.
  • the input surface is constructed at the point M so that the rays coming from the source Dc and passing through M are falling, or more horizontal, at the exit of the lens Lc.
  • the input surface element in M is constructed so that the ray emerging from the lens, resulting from this limit radius, is straightened horizontally. Under these conditions, all the other rays coming from the source Dc, which arrive at M with a lower inclination, will come out of the lens while being descendants.
  • the point F of the transmitter on the Fig. 11 lowest and closest to the plane parallel to the plane (Oyz) passing through M, if M is situated in the zone where z is greater than 0, and the furthest from that plane if M is situated in the zone where z is less than 0 ,. is the one that will give the highest inclined radius reaching M, that is to say the limit radius.
  • M is located in the zone where z is negative it is possible, to simplify the construction, to use an approximate construction of choosing the symmetric with respect to (Oyz) of the nearest point of the cited plane.
  • it is possible to link the horizontal deflection of the light rays originating from the origin of the reference and contained in the plane z 0 to the abscissa of their intersection with the input surface of the lens.
  • a first case is illustrated by the figure 12 , with a deviation independent of abscissa x and zero.
  • a second case is illustrated by the figure 14 , with a non-constant and piecewise linear deviation.
  • the module is focused.
  • the input face Ae3 is symmetrical with respect to the optical axis and has a convex vertex facing towards the source with a relatively strong curvature which decreases when one deviates from the optical axis.
  • Fig. 13 illustrates the isolux curve network obtained with a module conforming to Fig.12 .
  • the light beam has a horizontal cut-off line in the plane of the optical axis and is substantially symmetrical with respect to the vertical plane passing through this optical axis.
  • the beam has a maximum of illumination in its central zone corresponding to the focus.
  • Fig.14 is a schematic vertical section similar to that of Fig.12 , of a module with a light source Dd, which corresponds to a vertical wafer, orthogonal to the optical axis, with several electroluminescent chips aligned along the x-axis.
  • the exit face As4 of the lens Ld is toric, identical to the exit face As3 of Fig.12 .
  • the input face Ae4 is less convex towards the light source and the thickness of the lens along the optical axis is smaller.
  • fig.15 illustrates the network of isolux curves obtained with the Fig. 14 .
  • the cutoff line is always horizontal at the optical axis.
  • the isolux curves are substantially symmetrical with respect to the vertical plane passing through the optical axis. The light is more spread out than in the case of Fig. 13 .
  • a light source De constituted by an LED having a transparent protective dome 21 located above the emitter 22, itself placed in the air.
  • the inner face 21a and the outer face 21b of the dome 21, or protective bell, constitute two spherical diopters between the air and the transparent material of the dome 21. The successive deviations of the rays due to these two spherical dioptres are to be taken into account.
  • the method is as follows: for M given, we search for Fs closest to M in projection on Ox (the farthest for z negative, or the symmetric of the quoted point for z positive, within the framework of a simplified construction) such that there exists a point F of the lower edge of the emitter emitting a ray reaching M and passing through Fs: the corresponding emergent radius in Fs is the limit radius for M.
  • the spheres 21a, 21b are centered on the center of the emitter 22 and not on its lower edge where the foci F must be taken. As a result, the height of the light source 22 is to be taken into account. in the construction of the Ae5 surface.
  • Fig. 18 is a schematic vertical section of a module with a diode protected by a dome 21 constructed as set forth above.
  • the input surface Ae5 has a convexity facing the light source De and is symmetrical with respect to the vertical plane passing through the optical axis.
  • Fig.19 illustrates the network of isolux curves obtained with a module according to Fig.18 .
  • the curves are located below the horizontal plane passing through the optical axis.
  • Each curve has a substantially rectangular curvilinear contour whose long sides are substantially horizontal, with a slight concavity turned downwards.
  • Fig.20 illustrates schematically in horizontal section a projector formed by the assembly of three modules whose output surfaces are constituted by cylindrical surfaces of revolution of the same radius of curvature.
  • the input surfaces inside the projector form successive corrugations 23 while the output surface is smooth continuous, formed by a cylindrical surface of which a generator 24 appears on Fig.20 .
  • Fig.21 is a schematic front view of a projector with several superposed rows of assembled modules.
  • the upper row 25 corresponds to two modules ensuring a cut at 15 °.
  • the middle row 26 corresponds to three modules, two of which give a cut at 15 ° and the third lights to the left.
  • the lower row 27 corresponds to three modules illuminating to the right. Each extinguished row has the same exterior appearance of a single cylindrical bar or continuous ring segment.
  • FIGS. Figures 22a and 22b A variant of construction has also been provided in the case of modules, operating in particular but not exclusively with diodes with protective domes as shown in FIGS. Figures 22a and 22b . Take the case of a module as represented in figure 22a , with a protective dome diode as described above and arranged vis-à-vis the lens and perpendicular to the optical axis.
  • Is v o the direction vector of the limit ray reaching the surface in M , (that is to say the radius coming from the source reaching M which must be deflected by the lens so as to emerge parallel to the plane ( O , x , there ), so that all the other rays coming from the source reaching the M- lens are deflected downwards), the direction is easily calculated r corresponding radius, refracted in M by the desired surface, as a function of not , that is, of n z and v o . It is then easy to calculate the emergence point P of this radius out of the lens as a function of n z and v o : we search ⁇ such that P + ⁇ ⁇ r belongs to the torus of the exit surface. The normal P being known (torus), we finally calculate the direction e emerging ray, refracted at P , as a function of n z .
  • F moves along the edge of the emitter to be quickly constant (lower corner of the emitter, on the same side as M with respect to the plane ( O , there , z )), when x is close to or greater than the half width of the emitter).
  • the figure 23a shows the isolux obtained with a diode and a lens thus constructed: the distribution of the beam is well centered and horizontal. This type of beam may advantageously complete a code-type beam.
  • the two modules according to the figure 22b correspond to a variant of the modules according to the figure 22a
  • Each module uses a dome diode which is inclined at approximately 45 ° upwards with respect to the optical axis.
  • the method of construction of the lens is in principle identical to that described in the context of the figure 22a .
  • the figure 23b shows the curves of isolux obtained: we see, in comparison with those of the figure 23a , that the beam is much thinner, less than 3%.
  • the beam is intense (more than 40 lux at 25 meters), and it has a clear horizontal cut, above the horizontal below the glare threshold: this type of beam perfectly meets the requirements for a motorway-type beam regulatory.
  • Fc + designates the lower corner of the next largest coordinate transmitter x and if the components along x and z of v o ( F C + , F S ) are positive, Fc + is a focus and ( F S , v o ( F C + , F S )) is a limit radius.
  • Fc- denotes the lower corner of the smallest coordinate emitter following x and if the components along x and z of v o ( F C- , F S ) are respectively negative and positive, Fc- is a focus and ( F S , v o ( F C- , F S )) is a limit radius. Otherwise, if the Fs coordinate x is greater than the center of the emitter, Fc- is a focus and ( F S , v o ( F C- , F S )) is a limit radius. Otherwise, Fc + is a focus and ( F S , v o ( F C + , F S )) is a limit radius.
  • the figure 24a shows a lens and its diode according to the variant II ⁇ , in a configuration intended to produce a fog beam according to the representation of the isolux of the figure 24b .
  • the figure 25a shows a lens and its diode according to variant II ⁇ , in a configuration intended to produce a motorway complement beam, as represented in the isoluxes of the figure 25b .
  • the figure 26 represents points and angles that were used in the description of the construction method above, including zo and delta and omega angles.
  • the invention makes it possible to control the horizontal distribution of the light and to obtain a cut-off, possibly complex, with an exit surface for each module possibly allowing the assembly of several modules by creating a lens overall single smooth outer face.

Claims (14)

  1. Kraftfahrzeug-Scheinwerfermodul, welches ein Lichtbündel mit Hell-Dunkel-Grenze abgibt, mit:
    - einer Linse (La)
    - einem Reflektor (Ma) mit einem inneren Brennpunkt und einem äußeren Brennpunkt, der mit dem Brennpunkt der Linse zusammenfällt oder diesem benachbart ist,
    - einem Ablenkspiegel (Na) und
    - einer Lichtquelle (Da), die hinter der Linse, von der sie durch die Luft getrennt ist, angeordnet und in der Nähe des inneren Brennpunkts des Reflektors platziert ist, wobei die Lichtquelle wenigstens eine Leuchtdiode umfasst,
    dadurch gekennzeichnet, dass die Austrittsfläche (As1) der Linse nach vorne vollständig konvex ist und solchermaßen ausgebildet ist, dass sie sich entlang einer glatten und kontinuierlichen Fläche an die Austrittsflächen der Linsen gleichartiger benachbarter Module anschließt, und die Eintrittsfläche (Ae1) der Linse solchermaßen definiert ist, dass das Modul ein Lichtbündel mit Hell-Dunkel-Grenze ohne Beteiligung einer abschattenden Blende abgibt, und dass die Eintrittsfläche (Ae1) solchermaßen ausgebildet ist, dass der Lichtweg vom äußeren Brennpunkt (Be) des Reflektors bis zu einer die Austrittsfläche (As1) in ihrem Schnittpunkt (h1) mit der optischen Achse des Moduls tangierenden Ebene (Π1) gleichförmig ist.
  2. Modul nach dem vorhergehenden Anspruch,
    dadurch gekennzeichnet, dass die Eintrittsfläche (Ae6) der Linse solchermaßen berechnet ist, dass eine Gruppe von als Grenzstrahlen bezeichneten Lichtstrahlen, die von der Strahlungsquelle abgegeben werden, aus der Linse solchermaßen austreten, dass sie an den Punkten, an denen sie auf diese treffen, zu einer gegebenen, als Austrittswellenfläche bezeichneten Fläche alle normal sind.
  3. Modul nach dem vorhergehenden Anspruch,
    dadurch gekennzeichnet, dass die Austrittswellenfläche zylindrisch ist, mit senkrechten Erzeugenden und beliebigem Querschnitt.
  4. Modul nach Anspruch 2 oder 3,
    dadurch gekennzeichnet, dass die Diode ausreichend geneigt ist, damit der Winkel, in dem der Strahler der Diode von einer Mehrzahl von Punkten der Linse aus gesehen wird, kleiner ist, als dies mit einer Linse der Fall wäre, die entlang einer zur optischen Achse des Moduls lotrechten Ebene angeordnet ist.
  5. Modul nach einem der Ansprüche 2 bis 4,
    dadurch gekennzeichnet, dass die Diode ausreichend geneigt ist, damit der bezüglich der Achse des Strahlers der Diode am stärksten geneigte Lichtstrahl, der die Linse erreicht, geringer ist als der Grenzwinkel der Verteilung des von der Diode emittierten Lichtbündels.
  6. Modul nach einem der Ansprüche 2 bis 5,
    dadurch gekennzeichnet, dass die Diode bezüglich der optischen Achse des Moduls um +/- 35° bis +/- 55°, insbesondere +/- 40° bis +/- 50° geneigt ist.
  7. Modul nach einem der Ansprüche 2 bis 6,
    dadurch gekennzeichnet, dass es ein Lichtbündel oder ein Lichtbündelteil vom Typ Autobahnlicht zu emittieren vermag, das insbesondere eine Lichtbündeldicke von weniger als 5 %, insbesondere weniger als 3 %, eine Lichtintensität von insbesondere wenigstens 40 Lux in einer Entfernung von 25 Metern und eine Hell-Dunkel-Grenze über der Horizontalen aufweist.
  8. Scheinwerfermodul nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass die Austrittsfläche (As1-As5) der Linse zylindrisch oder torisch ist, wobei der Querschnitt der Austrittsfläche der Linse durch eine zur optischen Achse parallele vertikale Ebene nach vorne konvex ist.
  9. Scheinwerfermodul nach Anspruch 1, mit einem Ellipsoid-Reflektor (Ma) und einem Ablenkspiegel (Na),
    dadurch gekennzeichnet, dass die Austrittsfläche (As1) so gewählt ist, als handelte es sich um die eines Rotationszylinders, dessen Querschnitt durch eine durch die optische Achse verlaufende vertikale Ebene ein nach vorne konvexer Kreisbogen ist, und die Eintrittsfläche (Ae1) solchermaßen ausgebildet ist, dass ein vom Brennpunkt (Be) stammender und sich in der Luft ausbreitender Lichtstrahl (r1) nach Eintritt in die Linse (La) und Brechung gemäß (r2) aus der Fläche (As1) gemäß einem zur optischen Achse (Oy) parallelen Strahl (r3) austritt.
  10. Modul nach dem vorhergehenden Anspruch,
    dadurch gekennzeichnet, dass die Form des Rands (10) des Ablenkspiegels so ausgebildet ist, dass das Lichtbündel eine V-förmige Hell-Dunkel-Grenze aufweist.
  11. Modul nach Anspruch 9 oder 10,
    dadurch gekennzeichnet, dass der Rand des Ablenkspiegels eine höckerartige Deformation (11) aufweist, um die Abbildungsfehler der Linse teilweise zu kompensieren.
  12. Modul nach Anspruch 9 oder 10,
    dadurch gekennzeichnet, dass der Rand (10a) des Ablenkspiegels beidseits der durch die optische Achse verlaufenden vertikalen Ebene zwei durch ein konkav gewölbtes Teil (15) miteinander verbundene Höcker (13, 14) aufweist, um ein zusätzliches Modul für Autobahnlicht zu bilden, das das Licht in der Achse unterhalb der Horizontalen verstärkt.
  13. Kraftfahrzeug-Scheinwerfer, der ein Lichtbündel mit Hell-Dunkel-Grenze erzeugt, wobei dieser durch eine Anordnung mehrerer Module wie in einem der vorhergehenden Ansprüche definiert gebildet ist, die solchermaßen aneinandergereiht sind, dass die Austrittsfläche der Optik des Scheinwerfers glatt und stetig ist.
  14. Scheinwerfer nach dem vorhergehenden Anspruch, der aus mehreren übereinanderliegenden Reihen aneinandergefügter Module gebildet ist, wobei einige der Module eine Hell-Dunkel-Grenze von 15° erzeugen und andere Module die Seite ausleuchten können, wobei jede ausgeschaltete Reihe von außen betrachtet wie ein einziger zylindrischer Stab oder ein kontinuierliches torische Segment aussieht.
EP06291391.8A 2005-09-09 2006-09-01 Verfahren zur Herstellung eines Moduls eines Kraftfahrzeugscheinwerfers Active EP1762776B1 (de)

Applications Claiming Priority (2)

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FR0509234A FR2890721B1 (fr) 2005-09-09 2005-09-09 Procede de construction d'un module de projecteur lumineux pour vehicule automobile, module et projecteur.
FR0602391A FR2898662A1 (fr) 2006-03-17 2006-03-17 Procede de construction d'un module de projecteur lumineux pour vehicule automobile, module et projecteur

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US20070058386A1 (en) 2007-03-15
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EP1762776A1 (de) 2007-03-14

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