EP1500869A1 - Elliptical lighting module without screen emitting a low beam and headlamp comprising the same - Google Patents

Elliptical lighting module without screen emitting a low beam and headlamp comprising the same Download PDF

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Publication number
EP1500869A1
EP1500869A1 EP04291792A EP04291792A EP1500869A1 EP 1500869 A1 EP1500869 A1 EP 1500869A1 EP 04291792 A EP04291792 A EP 04291792A EP 04291792 A EP04291792 A EP 04291792A EP 1500869 A1 EP1500869 A1 EP 1500869A1
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EP
European Patent Office
Prior art keywords
reflector
lighting
lighting module
light
according
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
EP04291792A
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German (de)
French (fr)
Other versions
EP1500869B1 (en
Inventor
Pierre Albou
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Valeo Vision SA
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Valeo Vision SA
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Filing date
Publication date
Priority to FR0309094 priority Critical
Priority to FR0309094A priority patent/FR2858042B1/en
Application filed by Valeo Vision SA filed Critical Valeo Vision SA
Publication of EP1500869A1 publication Critical patent/EP1500869A1/en
Application granted granted Critical
Publication of EP1500869B1 publication Critical patent/EP1500869B1/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • F21S41/147Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148Light 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • F21S41/151Light emitting diodes [LED] arranged in one or more lines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/162Incandescent light sources, e.g. filament or halogen lamps
    • F21S41/164Incandescent light sources, e.g. filament or halogen lamps having two or more filaments
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25Projection lenses
    • F21S41/27Thick lenses
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32Optical layout thereof
    • F21S41/322Optical layout thereof the reflector using total internal reflection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32Optical layout thereof
    • F21S41/36Combinations of two or more separate reflectors
    • F21S41/365Combinations of two or more separate reflectors successively reflecting the light
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43Illuminating 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

The invention relates to a lighting module (10) for a motor vehicle headlamp producing a cut-off type lighting beam, comprising, arranged from rear to front generally along a longitudinal horizontal optical axis (AA), two reflectors. (12, 12 ') of the elliptical type, two light sources (14, 14') which are respectively arranged in the vicinity of a first focus (F1, F1 ') of each reflector (12, 12'), and a converging lens (16) whose focal plane is arranged in the vicinity of the second focus (F2) of the first reflector (12), the first reflector also having a horizontal flat reflection surface (22), the upper face (24) is reflective. According to the invention, the second light source is arranged so as to emit a light beam only towards the second reflector (12 '), and at least one of the light sources (14, 14') being constituted by a light-emitting diode. <IMAGE>

Description

The present invention relates to a lighting module and a motor vehicle lighting projector.

The present invention relates more particularly to a module lighting for a motor vehicle headlight producing a lighting beam of the cut-off type, comprising, rear-facing before globally along a horizontal longitudinal optical axis, a reflector of the elliptical type which delimits a reflection volume for light rays and which has a substantially elliptical surface of reflection, at least one light source which is arranged in the vicinity of a first focus of the reflector, and a convergent lens whose plane focal is arranged in the vicinity of the second focus of the reflector.

Elliptical projectors, or projectors with optical image reproduction, are well known, especially for the realization of a cut-off lighting beam.

A beam of cut-off lighting means a beam lighting that has a directional limit, or cutoff, above from which the luminous intensity emitted is weak.

The functions of low beam, fog lamps and codes are examples of cut-off light beams, in accordance with the European legislation in force.

Generally, in an elliptical projector, the cut is made by means of a cover, which is formed of a vertical plate of adapted profile, which is interposed axially between the elliptical reflector and the convergent lens, which is arranged in the vicinity of the second focus reflector.

The cache allows to hide the light rays from the light source and reflected by the reflector towards the lower part of the focal plane of the convergent lens, and which would be, in the absence of cache, emitted by the projector above the cutoff.

A disadvantage of this type of projector is that part significant amount of light energy emitted by the source dissipates into the back side of the cache. In addition, this type of module does not allow dual function, namely the "road" function and the "code" function.

A solution to this problem is disclosed in US Patent 4,914 747.

In this document is described a lighting module for a motor vehicle headlamp producing a lighting beam of the cut-off type, comprising, arranged from rear to front overall along a longitudinal horizontal optical axis, two reflectors of the type elliptical which each delineates a volume of reflection for rays each of which has a substantially elliptical surface of reflection, two light sources which are respectively arranged at neighborhood of a first focus of each reflector, and a lens convergent whose focal plane is arranged in the vicinity of the second focus of the first reflector, this first reflector having a surface horizontal plane of reflection, whose upper surface is reflective, which delimits vertically down the beam reflection volume emitted by the first light source and having an end edge before, said cutting edge, which is arranged in the vicinity of the second focus reflector, so as to form the cut in the beam lighting.

According to this prior art, the first light source formed of a filament is equipped with a lower cover ensuring a single beam upward issued by this source. The first elliptical reflector that is associated can be so optimized designed according to this first source to fulfill the function code.

On the other hand, the second light source, also a filament, can emit as much up as down. If the second elliptical reflector associated with it can be designed so optimized according to this second source to fulfill the function route, there is an upper beam defined by the choice of this second light source and reflecting on the first reflector defined as for him by the choice of the first light source. If this beam once thoughtful participates in the route function, this function can only be optimized since it depends on criteria relating to the code function, for the first reflector.

This results in an uncontrolled arrangement and random efficiency or at least requiring many tests to get the functions desired.

The invention solves this technical problem and to do this, it offers a lighting module for a vehicle headlamp automobile producing a lighting beam of the cut-off type, comprising, arranged from rear to front generally along an axis longitudinal horizontal optics, two elliptical type reflectors which each delineates a reflection volume for light rays and which each has a substantially elliptical reflection surface, two light sources which are respectively arranged in the vicinity of a first focus of each reflector, and a converging lens whose focal plane is arranged in the vicinity of the second focus of the first reflector, this first reflector having a flat surface horizontal reflection, whose upper surface is reflective, which vertically downwards the reflection volume of the beam emitted by the first light source and having an end edge before, said cutting edge, which is arranged in the vicinity of the second focus of the reflector, this flat surface of the first reflector being arranged in a horizontal plane passing globally through the foci of the first reflector, characterized in that the second light source is arranged to emit a light beam only towards the second reflector, at least one of the light sources being consisting of a light emitting diode.

Thus, each light source emits in half a volume of reflection limited by the corresponding elliptical reflector, so independent. This allows to control their function and their radiation in a simple and precise way.

Thanks to the lighting module according to the invention, the majority of the flow light emitted by each source is used in the light beam produced by the module, to achieve the dual function of lighting regulatory framework, preferably the "road" function and the "Code" ..

According to a preferred embodiment, this arrangement consists in that the two light sources are separated by a cowling opaque.

Preferably, the second foci of the first and second elliptical reflectors are substantially merged.

Advantageously, said flat horizontal plane of reflection, whose upper surface is reflective, consists of a piece transparent with a reflective coating.

This characteristic makes it possible to limit the hole or dead zone of light corresponding to the image of the thickness of this face reflective by the light beam reflected by the first reflector to the thickness of said reflective coating which can be realized by a vacuum deposit of aluminum for example which is of a thickness between about 500 nm and about a few micrometers, of the order of magnitude of a few visible wavelengths.

In addition, this transparent part also has a function optical relative to the optical beam reflected by the second reflector. Indeed, it is crossed by this beam.

In order to limit the optical losses at this crossing, preferably, said transparent piece has a lower face spherical centered on the second focus of the second elliptical reflector.

Thus the rays of light emitted by reflection on the second Reflector are normal to this underside.

Preferably, the substantially elliptical surface of the first reflector is formed by an angular sector substantially of revolution, around the longitudinal optical axis, and in that this sector angle extends vertically above the flat surface of the reflector.

Preferably, the substantially elliptical surface of the second reflector is formed by an angular sector substantially of revolution, around an axis called revolution.

And advantageously, the optical axis of the first reflector and the axis of revolution of the second reflector are secant.

According to other features of the invention:

  • the flat surface of the reflector may extend longitudinally rearwardly from its cutting edge at least to the vicinity of the first focus of the reflector;
  • the light source associated with the first reflector is arranged in the module so that its light scattering axis is substantially perpendicular to the flat surface of this reflector;
  • the cutting edge of the flat surface of the first reflector has a curved profile, in the horizontal plane, so as to follow the overall curvature of the focal plane of the lens.

The invention also relates to a lighting projector of motor vehicle having at least one lighting module such as previously specified and intended for a dual lighting function.

Preferably, this dual function includes the function lighting in "code" mode and the lighting function in "Road".

Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings among which:

  • Figure 1 is a vertical sectional view which schematically shows a preferred embodiment of the lighting module according to the invention;
  • FIG. 2 is a perspective view which partially represents this preferred embodiment of the lighting module according to the invention;
  • Figure 3 is a top view which schematically shows the lighting module of Figure 1;
  • Fig. 4 is a side view which schematically illustrates the path of the light rays in the illumination module of Fig. 1;
  • Figure 5 is a view similar to that of Figure 2 which shows a second embodiment of the lighting module according to the invention;
  • Figure 6 is a view similar to that of Figure 2 which shows an alternative embodiment of the lighting module of Figure 1 comprising a plurality of light emitting diodes;
  • Figure 7 is a front view which shows schematically a vehicle lighting projector comprising lighting modules according to the invention and providing a regulatory lighting beam crossover;
  • Fig. 8 is a schematic perspective view of the illumination module shown in Fig. 1;
  • FIG. 9 is a schematic representation of an image of the projection of the light beam emitted by the module, according to a first mode of operation of the module according to the invention.
  • Figure 10 is a schematic representation of an image of the projection of the light beam emitted by the module, according to a second mode of operation of the module according to the invention.

FIG. 1 schematically shows a module lighting 10 which is made in accordance with the teachings of the invention.

In a conventional manner, the lighting module 10 comprises, arranged from rear to front along a horizontal longitudinal optical axis A-A, a first reflector 12 of the elliptical type, a first source 14 which is arranged in the vicinity of a first focus F1 of the first reflector 12, and a convergent lens 16 whose focal plane is arranged in the vicinity of the second focus F2 of the first reflector 12.

The first reflector 12 and the lens 16 form part of the optical system of the lighting module 10.

The optical axis A-A defines here, in a non-limiting way, a direction longitudinal axis and a back-to-front orientation, which corresponds to a left-to-right orientation in the figures. The axis optical A-A is for example substantially parallel to the longitudinal axis of a vehicle (not shown) equipped with the lighting module 10.

In the following description, without limitation, we will use a vertical orientation that corresponds to a top-to-bottom orientation in Figure 1.

The convergent lens 16 is here a piece of revolution around of the longitudinal optical axis A-A. The lens 16 has, vis-à-vis the first reflector 12, a transverse input surface 17 for the light rays.

According to the embodiment shown here, the first reflector 12 has an elliptical surface 18 which is in the form of a substantially angular sector of revolution, and which extends in the half space above a passing horizontal axial plane by the longitudinal optical axis A-A.

The inner face 20 of the elliptical surface 18 is reflective.

It is noted that the elliptical surface 18 may not be perfectly elliptical and she can have several specific profiles planned for optimize the light distribution in the product beam by the module 10, according to the lighting function "code" performed by the module 10. This implies that the reflector is not perfectly of revolution.

In accordance with the teachings of the invention, the first reflector 12 has a horizontal flat surface 22 whose face upper 24 is reflective.

The first reflector 12 delimits a reflection volume for the light rays emitted by the first source 14, ie a volume in which the light rays are emitted and in which the rays bright are reflected. This volume of reflection is delimited, in its upper part, by the internal surface of reflection 20 of the surface elliptical 18, and vertically downwardly by the reflecting face 24 of the flat surface 22.

The flat surface 22 extends here in a horizontal axial plane.

Figures 2 to 7 represent only this first reflector 12, the lens 16 and the flat surface 22.

The flat surface 22 is delimited, at the rear, at its intersection with the elliptical surface 18, by an elliptical edge 26, and at the front, by a longitudinal end edge before 28. It can be provided alternatively that the flat surface 22 is delimited at the rear by a segment of perpendicular to the axis A-A and passing in the immediate vicinity of the source 14, in front of the latter.

The front end edge 28 of the flat surface 22 is arranged at the near the second focus F2 of the reflector 12, so as to form a sufficiently sharp cut in the lighting beam produced by the lighting module 10.

In the following description, we will designate this edge front end 28 by "cutting edge 28".

The focal plane of the lens 16, in a horizontal plane passing through the focus F2 of the lens 16, forms a curved profile, concave forward. According to the embodiment, the curved shape of this profile is more or less complex, and can be likened in a first approximation to a arc. Therefore, preferably, the cutoff edge 28a a curved profile, in the horizontal plane, so as to follow overall the profile of the focal plane of the lens 16.

According to the embodiment shown here, the flat surface reflective 22 has a semi-ellipsoidal rear portion 30, which is delimited by the elliptical edge 26, and by the diameter 32 of the front edge 34 semi-circular of the elliptical surface 18.

The reflecting flat surface 22 has a front section 36 overall isosceles trapezoidal, which is delimited by the diameter 32 of the elliptical surface 18, by two lateral edges 38, 40, and by the edge of cutoff 28.

According to the embodiment shown here, the width cross-section of the front section 36 progressively increases towards the front, so that the transverse width of the cutting edge 28 substantially equal to the diameter of the entrance surface of the lens 16.

According to an alternative embodiment as shown in FIG. 3, the flat surface 22 may comprise only a front section 36, which extends axially rearwards from the cutting edge 28 up to a certain point in the optical axis A-A between the first F1 and the second F2 foci of the reflector 12.

Advantageously, the light source 14 is provided for emit light energy in less than one "half-space" above the flat surface 22, and to emit its light energy towards the inner face 20 of the elliptical surface 18.

Advantageously, the light source 14 is a diode electroluminescent encapsulated 44.

Here is meant by light emitting diode 44, the junction which produces light energy as well as globe, or capsule, diffusion bright, which envelops the upper part of the junction.

Conventionally, the light-emitting diode 44 is mounted on an electronic support plate 42, which is shown in FIG. 4, and which is arranged here parallel to the flat surface 22.

The light-emitting diode 44 has a diffusion axis luminous B-B which is here substantially perpendicular to the surface plane 22.

The light-emitting diode 44 emits its light energy in a solid angle globally centered around its diffusion axis bright B-B, and less than 180 degrees.

This arrangement allows the diode 44 to emit the majority of its light energy towards the inner face 20 of the elliptical surface 18.

The principle of operation of the lighting module 10 according to the invention is as follows.

It is assumed that the light source 14 is of small extent around a point coincides with the first focus F1 of the reflector elliptical 18.

At first, we consider the light rays emitted by the light source 14 which pass over the cutoff edge 28, which will be designated by primary radii R1.

Since the light source 14 is arranged at the first focus F1 of the elliptical reflector 18, most of the primary rays R1 emitted by the source 14, after being reflected on the inner face 20 of the elliptical surface 18, is returned to the second focus F2 of the reflector 18, or in the vicinity of it.

These primary light rays R1 form, at the focus F2 of the lens 16, a concentrated bright image that is projected, at the front of the lighting module 10, by the lens 16, in one direction substantially parallel to the longitudinal axis A-A, but oriented towards the low.

In a second step, we consider the light rays R2 emitted by the source 14 that would pass below the cutoff edge 28, if there was no flat surface 22, and which will be designated by secondary rays R2.

These secondary light rays R2 are reflected by the face internal 20 of the elliptical surface 18 to the reflecting flat surface 22, so that they are reflected a second time forward.

During this second reflection, secondary light rays R2 are transmitted to the upper part of the entry surface 17 of the 16. Therefore, because of its convergence properties, the lens 16 deflects the secondary light rays R2 downwards. The secondary light rays R2 are thus emitted under the cut in the lighting beam, in the same area in which are emitted the rays R1.

Plus the place of reflection on the flat surface 22 of a radius secondary bright R2 is close to the cutoff edge 28, so close of the focal plane of the lens 16, plus the direction of this light ray secondary R2, at the exit of the lens 16, is close to a direction parallel to the longitudinal axis A-A.

An advantage of the lighting module 10 according to the invention is that its optical system 11 does not hide a large part of the rays light emitted by the source 14, as is the case in a module conventional lighting with a cover.

The reflecting flat surface 22 makes it possible to "fold" the images of light source 14 that are reflected by the surface elliptical 18 of the reflector 12 to the second focus F2 of the reflector 12.

Indeed, in the absence of the flat surface 22, some of these images should overlap the limit formed by the cutoff edge 28, in a vertical plane generated by the cutting edge 28. Each image would then have an upper portion above the edge of cut-off 28 and a lower portion below the edge of 28. Thanks to the flat reflective surface 22, the portion bottom of each image is reflected upward, as if the lower portion was folded over the upper portion, so that these portions of the image are superimposed above the cutoff edge 28, in the vertical plane generated by the cutoff edge 28.

The "fold" formed by this "folding" of images helps to form a clear cut in the light beam projected by the lens 16.

The lighting module 10 according to the invention also has particular advantages, in the context of the use of a diode electroluminescent 44 as a light source 14 in a module lighting.

Indeed, the image of the virtual source corresponding to a diode is usually round and diffuse.

To make a break in a lighting beam, from of a lighting module using a light source and an optical Fresnel, or using a light source and reflector type to complex surface, it is necessary to align the edges of the images of the light source on the measurement screen used to validate the beam regulatory lighting.

When the light source is a filament, its virtual image has globally the shape of a rectangle, so that it is relatively easy to make a clean cut by aligning the edges of the rectangles.

When the light source is a diode, it is much more difficult to make a clean cut by aligning the images corresponding, round shapes.

This difficulty could be overcome by using a diaphragm with the diode, but then we would lose a significant amount of the light energy produced by the diode.

The lighting module 10 according to the invention makes it possible to clear cut with a diode 44, because it projects to the front the image of a edge of the optical system 11, ie the image of the cutoff edge 28.

The shape of the cut in the lighting beam is therefore determined by the profile of the cutting edge 28, in a projection on a vertical and transverse plane.

Another difficulty for the realization of a lighting module to from a diode comes from the fact that the distribution of energy light in the light beam emitted by the diode is not homogeneous. Therefore, it is very difficult to achieve a beam homogeneous lighting from the direct images of the diode.

The lighting module 10 according to the invention overcomes this difficulty in exploiting a property of elliptical lighting modules which is to "mix" the images of the light source to the second focal point F2 of the reflector 12, which improves the homogeneity of the beam lighting product.

An advantage of the lighting module 10 according to the invention is that it exploits the property of encapsulated diodes 44 to emit globally in a half space, which captures over eighty percent of the luminous flux emitted by the diode 44, whereas in a traditional code elliptical projector, we capture less than fifty percent of the luminous flux.

According to a first embodiment, which is represented schematically in FIGS. 2 to 4, the lighting module 10 is achieved by an assembly of discrete elements.

The lighting module 10 comprises, for example, an element 18 forming the elliptical portion of the reflector 12, an element 22 forming the flat surface of the reflector 12, and an element 16 forming the lens convergent.

The inner face of the elliptical portion 18 and the upper face of the flat surface 22 are for example coated with a material reflective.

In the case where the light source 14 is a diode electroluminescent 44, given the low heat dissipation of this type of source, compared to lamps, it is possible to realize the discrete elements in the form of polymer parts, assembled for example by interlocking.

The lens 16 may be a Fresnel lens.

According to another embodiment of the invention, which is schematically shown in FIG. 5, the optical system 11 of FIG. lighting module 10 is made in one solid optical part, in transparent material, for example PMMA (polymethacrylate) methyl).

The solid optical part is for example made by molding, or by machining.

To allow reflection of the light rays emitted by the source 14 in the reflection volume delimited by the reflector 12, the outer surface of the elliptical portion 18 of the reflector 12 and the surface outer, here below, the flat surface 22 of the reflector 12 are coated with a reflective material.

For certain portions of the reflector 12, it is possible to use the total reflection properties in an index medium greater than air to cause the reflection of light rays in the volume of reflection delimited by the reflector 12, without using any material reflective. These portions of the reflector 12 will then have a shape slightly different from that of a pure ellipsoid.

According to this second embodiment, the light rays which are emitted by the light source 14 propagate inside the material constituting the optical system 11 of the lighting module 10, then they come out of the optical system 11 through the front of the lens convergent 16.

The fact that light rays propagate inside a material, in the second embodiment, while the spokes luminous propagate in the air, in the first embodiment, has no significant influence on the principle of module operation lighting 10 according to the invention.

Advantageously, the reflecting flat surface 22 comprises a cavity of complementary shape to the capsule of the diode electroluminescent 44.

For example, if the capsule of diode 44 has a shape hemispherical, the cavity is substantially hemispherical.

According to a variant of this second embodiment, the reflector 12 is made of a single piece of transparent material, which is distinct from the piece forming the convergent lens 16.

According to an alternative embodiment of the invention, which is shown in FIG. 6, the light source 14 can be realized at by means of a plurality of light-emitting diodes 44.

It should be noted that the light-emitting diodes 44 must be very close to each other, so that they are arranged overall to the first focus F1 of the reflector 12.

For example, according to FIG. 6, two diodes 44 are aligned, advantageously in a direction perpendicular to the axis longitudinal optical A-A.

The resulting light source 14 is then equivalent to a light source extended in width because the light beams produced by each light-emitting diode 44 overlap.

This arrangement of the diodes 44 thus makes it possible to widen the beam light produced by the lighting module 10.

Advantageously, to achieve a lighting function regulatory, cut-off, for example a "code" lighting function, a vehicle headlamp is made by means of several modules identical lighting systems operating simultaneously.

The lighting modules 10 are arranged in parallel, that is to say that their optical axes A-A are substantially parallel to each other.

Thus, the lighting beams produced by each of the modules 10 are superimposed on the front of the vehicle so as to form the regulatory lighting beam with cut-off.

For example, there is shown in Figure 7 a projector 46 vehicle that performs a code function, and that uses four identical lighting modules 10.

As the crossing light beam must have a cut having an inclined portion of a given angle, by example fifteen degrees, two lighting modules 48 of the projector 46 are rotated fifteen degrees, about their longitudinal optical axis A-A, in order to realize a lighting beam including a cut tilted fifteen degrees from a horizontal plane.

The other two lighting modules 50 form a beam lighting having a horizontal cut.

The superposition of the lighting beams produced by the four lighting modules 10 then forms a lighting beam with a horizontal part and an inclined part of fifteen degrees.

According to an alternative embodiment (not shown) of the invention, the light source 14 may be formed by the free end of a fiber optic bundle.

A disadvantage of optical fibers is that they form a light source having a bright heart and a dark ring, due to the sheath surrounding the heart of the fiber.

This type of light source, when used in a vehicle lighting projector using for example a reflector of type with a complex surface, thus forms, in the lighting beam, images in the form of pixels surrounded by a dark area, due to the sheath.

An advantage of the lighting module 10 according to the invention is that it allows to mix all the images of the light source 14 with second focus F2 of the reflector 12, so that we do not find in the lighting beam the pixels of the optical fiber.

Now back to Figure 1, associated with Figure 8. In more, from what has already been described precisely above, in order to fill a dual function, namely the "code" function but also the function "road", the module according to the invention, intended to equip a automotive vehicle lighting projector, also features arranged from rear to front globally along the horizontal optical axis longitudinal A-A, a second reflector 12 'of the elliptical type which delimits a reflection volume for light rays and which has a substantially elliptical reflection surface 18 ', 20', a second source 14 'which is arranged in the vicinity of a first focus F1' of the second reflector 12 '. This second light source 14 'is arranged so as to emit a single light beam downwards.

The second reflector 18 'and the second light source 14' can be similar to the first reflector 18 and the first source 14. They can therefore have all the characteristics correspondents already mentioned above, without these being repeated here explicitly.

To do this, the two light sources 14, 14 'to control which are preferably two light-emitting diodes or two sets of light-emitting diodes, are separated from one opaque cover 60 which possibly can contain a radiator and control circuits.

As already seen above, the substantially elliptical surface of the first reflector 12 is formed by an angular sector of the room substantially of revolution about the longitudinal optical axis A-A, and this angular sector extends vertically above the flat surface 22 of the reflector.

The substantially elliptical surface of the second reflector is to it, formed by an angular sector of a piece substantially of revolution, around its so-called axis of revolution A'- A 'and, advantageously, the optical axis A-A of the first reflector and the axis of revolution A'- A 'of the second reflector are intersecting.

The second elliptical reflector 12 'is arranged to have its second focus substantially coincident with the second focus F2 of the first reflector 12. The optical axis A-A of the first reflector and the axis of revolution A'-A 'of the second reflector thus intersect substantially in this second focus F2.

The flat horizontal reflection surface 22, the face of which upper 24 is reflective, consists of a transparent piece 22 'bearing a reflective coating on its upper face and forming the reflective upper surface 24. Advantageously, this piece transparent 22 'has a spherical bottom surface 22A centered substantially on the second focus F2. Its side face 22B turned towards the lens 16 is advantageously defined by a surface defined defined in vertical plane by straight lines connecting the upper edge 34 from the first reflector 12 to the second focus F2.

Preferably, this transparent piece 22 'is made of PMMA (polymethylmethacrylate) and the reflective coating is constituted a vacuum deposit of aluminum.

The optical operation of the module has already been specified above for the first elliptical reflector 12 with its surface reflecting reflector 22, in particular with reference to FIG.

To summarize here, with reference to FIG. operation of the first light source 14, the major part primary rays emitted by the source 14, after having reflected on the inner face 20 of the elliptical surface 18, is returned to the second F2 focus of the reflector 18, or in the vicinity thereof. The Rays secondary luminaries are reflected by the inner face 20 of the surface elliptical 18 towards the reflecting flat surface 22, so that they reflect a second time forward, this reflective surface 22 operating a function of "folding".

An image I1 of the projection of the beam of light emitted by the module, at the output of the lens 16, is shown schematically in FIG. first function of the module corresponds in particular to the "code" mode of a motor vehicle headlamp.

When simultaneously switching the second source of light 14 ', most of the primary rays R1' emitted by the source 14 ', after being reflected on the inner face 20 of the surface elliptical 18, is returned to the second focus F2 or in the vicinity of this one. These normal rays at the bottom surface 22A of the room transparent 22 'pass through it without optical loss, losses near undergone by glassy reflection on the surface 22A, and are then returned by the lens 16 above the axis A-A.

An image of the projection of the beam of light emitted by the module, at the output of the lens 16, is shown schematically in FIG. image I2 is added to the previous image I1. This second function of the module corresponds in particular to the "road" mode of a motor vehicle headlight.

Given the transparency of the piece 22 'and the thickness reduced and not visible its reflective coating 24, the two images in question I1 and I2 are eye-joined and form a bundle of single light.

Claims (13)

  1. Lighting module (10) for a motor vehicle headlamp producing a cut-off type lighting beam comprising, arranged from rear to front generally along a longitudinal horizontal optical axis (AA), two reflectors (12, 12 ') ) of the elliptical type which each delimits a reflection volume for light rays and which each comprises a substantially elliptical reflection surface (20, 20 '), two light sources (14, 14') which are respectively arranged in the vicinity of a first focus (F1, F1 ') of each reflector (12, 12'), and a converging lens (16) whose focal plane is arranged in the vicinity of the second focus (F2) of the first reflector (12), the first reflector comprising also a horizontal plane reflective surface (22), whose upper surface (24) is reflective, which delimits vertically downward the reflection volume of the beam emitted by the first light source and having an end edge before (28), said cutting edge, which is arranged in the vicinity of the second focus (F2) of the reflector (12), this planar surface (22) of the first reflector being arranged in a horizontal plane passing generally through the foci (F1, F2) of the first reflector (12), characterized in that the second light source is arranged to emit a light beam only towards the second reflector (12 '), at least one of the light sources (14, 14') being constituted of a light-emitting diode.
  2. Lighting module (10) according to claim 1, characterized in that the two light sources are separated by an opaque cover (60).
  3. Lighting module (10) according to one of the preceding claims, characterized in that the second foci (F2, F2 ') of the first and second elliptical reflectors are substantially merged.
  4. Lighting module (10) according to one of the preceding claims, characterized in that said flat horizontal reflection surface (22), whose upper face (24) is reflective, consists of a transparent piece (22 ') bearing a reflective coating.
  5. Lighting module (10) according to claim 4, characterized in that said transparent piece (22 ') comprises a spherical lower face (22A) centered on the second focus (F2') of the second elliptical reflector (18 ').
  6. Lighting module (10) according to any one of the preceding claims, characterized in that the substantially elliptical surface (18, 20) of the first reflector (12) is formed by an angular sector substantially of revolution, around the longitudinal optical axis (AA), and in that this angular sector extends vertically above the flat surface (22) of the reflector (12).
  7. Lighting module (10) according to any one of the preceding claims, characterized in that the substantially elliptical surface (18 ') of the second reflector (12') is formed by an angular sector substantially of revolution, around an axis called revolution (A'-A ').
  8. Lighting module (10) according to claim 7, characterized in that the optical axis (A - A) and the axis of revolution (A '- A') of the second reflector (18 ') are intersecting.
  9. Lighting module (10) according to the preceding claim, characterized in that the flat surface of the reflector extends longitudinally rearwardly from its cutting edge, at least to the vicinity of the first focus (F1) of the reflector (12).
  10. Lighting module (10) according to any one of the preceding claims, characterized in that the light source (14) associated with the first reflector (18) is arranged in the module (10) so that its light scattering axis ( BB) is substantially perpendicular to the planar surface (22) of this reflector (12).
  11. Lighting module (10) according to any one of the preceding claims, characterized in that the cutting edge (28) of the flat surface (22) of the first reflector (12) has a curved profile, in the horizontal plane, in order to follow globally the curvature of the focal plane of the lens (16).
  12. Vehicle lighting headlamp (46), characterized in that it comprises at least one lighting module (10) according to any one of the preceding claims for a dual lighting function.
  13. Headlight according to Claim 12, characterized in that this dual function comprises the lighting function in "code" mode and the lighting function in "road" mode.
EP04291792A 2003-07-24 2004-07-13 Elliptical lighting module without screen emitting a low beam and headlamp comprising the same Active EP1500869B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR0309094 2003-07-24
FR0309094A FR2858042B1 (en) 2003-07-24 2003-07-24 Luminaire-free elliptical lighting module comprising a cut-off lighting beam and projector comprising such a module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL04291792T PL1500869T3 (en) 2003-07-24 2004-07-13 Elliptical lighting module without screen emitting a low beam and headlamp comprising the same

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EP1500869A1 true EP1500869A1 (en) 2005-01-26
EP1500869B1 EP1500869B1 (en) 2006-08-23

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JP (1) JP4460966B2 (en)
AT (1) AT337518T (en)
DE (1) DE602004002043T2 (en)
ES (1) ES2271804T3 (en)
FR (1) FR2858042B1 (en)
PL (1) PL1500869T3 (en)

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EP1762776A1 (en) * 2005-09-09 2007-03-14 Valeo Vision Method for the manufacturing of a module or a vehicle headlamp
EP1881264A1 (en) * 2006-07-21 2008-01-23 Valeo Vision Optical module for headlights of an automobile
EP1970619A1 (en) * 2007-03-14 2008-09-17 Valeo Vision Optical module for headlights of an automobile
FR2941785A1 (en) * 2009-02-05 2010-08-06 Valeo Vision Sas Optical device, in particular for a motor vehicle, such as a lighting or signaling device
FR2944578A1 (en) * 2009-04-21 2010-10-22 Valeo Vision Sas Module and lighting device for vehicle with enhanced road function
EP2390561A1 (en) * 2010-05-28 2011-11-30 Hella KGaA Hueck & Co. LED projection module for a vehicle headlight
WO2012034936A1 (en) * 2010-09-18 2012-03-22 Automotive Lighting Reutlingen Gmbh Motor vehicle headlight comprising a multifunctional projection module
WO2012038173A1 (en) * 2010-09-21 2012-03-29 Osram Ag Light-emitting device
FR2995662A1 (en) * 2012-06-29 2014-03-21 Valeo Vision Lighting module for projector of car, has secondary light source associated with main lens to generate beam with function codes when main source is activated and secondary source is deactivated, and beam with function of diurnal lighting
EP2711611A1 (en) * 2012-09-24 2014-03-26 Valeo Vision Lighting module, in particular for a motor vehicle
CN104421795A (en) * 2013-08-29 2015-03-18 现代摩比斯株式会社 Lamp for vehicle
EP1708513B1 (en) * 2005-03-30 2015-04-29 Samsung Electronics Co., Ltd. Illumination unit and image projection apparatus employing the same
DE102013225950A1 (en) * 2013-12-13 2015-06-18 Automotive Lighting Reutlingen Gmbh Automotive lighting device
CZ305372B6 (en) * 2013-11-22 2015-08-19 Varroc Lighting Systems, s.r.o. Motor vehicle headlight
CN105371204A (en) * 2014-08-11 2016-03-02 株式会社小糸制作所 Vehicle lamp
CN105805669A (en) * 2016-03-30 2016-07-27 奇瑞汽车股份有限公司 LED dipped headlight light distribution device
EP3115683A1 (en) * 2015-07-10 2017-01-11 Valeo Vision Lighting module for lighting and/or signalling of a motor vehicle
EP2284435B1 (en) * 2009-08-10 2018-03-07 Koito Manufacturing Co., Ltd. Lamp unit for vehicular headlamp

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DE102009008631B4 (en) * 2009-02-12 2016-11-03 Automotive Lighting Reutlingen Gmbh Projection module for a motor vehicle headlight
FR2962784B1 (en) * 2010-07-19 2015-01-16 Valeo Vision Reflector of the elliptical type corrected
FR2962786B1 (en) * 2010-07-19 2014-11-21 Valeo Vision Lighting module with incline and reverse elliptical reflector
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AT514161B1 (en) 2013-04-09 2016-05-15 Zizala Lichtsysteme Gmbh Light unit with aperture with at least one light window
DE102015113141A1 (en) 2014-12-15 2016-06-16 Mauser-Werke Oberndorf Maschinenbau Gmbh Method for machining a workpiece surface and workpiece

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EP1708513B1 (en) * 2005-03-30 2015-04-29 Samsung Electronics Co., Ltd. Illumination unit and image projection apparatus employing the same
EP1762776A1 (en) * 2005-09-09 2007-03-14 Valeo Vision Method for the manufacturing of a module or a vehicle headlamp
EP1881264A1 (en) * 2006-07-21 2008-01-23 Valeo Vision Optical module for headlights of an automobile
FR2913750A1 (en) * 2007-03-14 2008-09-19 Valeo Vision Sa Optical module for motor vehicle projector
EP1970619A1 (en) * 2007-03-14 2008-09-17 Valeo Vision Optical module for headlights of an automobile
US8939625B2 (en) 2009-02-05 2015-01-27 Valeo Vision Optical device, in particular for an automotive vehicle, such as a lighting or signalling device
FR2941785A1 (en) * 2009-02-05 2010-08-06 Valeo Vision Sas Optical device, in particular for a motor vehicle, such as a lighting or signaling device
EP2216589A1 (en) * 2009-02-05 2010-08-11 Valeo Vision Optical device for lighting or signalisation, namely for automobile vehicle
US8579483B2 (en) 2009-02-05 2013-11-12 Valeo Vision Optical device, in particular for an automotive vehicle, such as a lighting or signaling device
FR2944578A1 (en) * 2009-04-21 2010-10-22 Valeo Vision Sas Module and lighting device for vehicle with enhanced road function
WO2010121948A1 (en) * 2009-04-21 2010-10-28 Valeo Vision Lighting module and device for a vehicle with improved road function
CN102460002A (en) * 2009-04-21 2012-05-16 法雷奥照明公司 Lighting module and device for a vehicle with improved road function
US8545073B2 (en) 2009-04-21 2013-10-01 Valeo Vision Lighting module and device for vehicle with improved high-beam function
EP2284435B1 (en) * 2009-08-10 2018-03-07 Koito Manufacturing Co., Ltd. Lamp unit for vehicular headlamp
EP2390561A1 (en) * 2010-05-28 2011-11-30 Hella KGaA Hueck & Co. LED projection module for a vehicle headlight
WO2012034936A1 (en) * 2010-09-18 2012-03-22 Automotive Lighting Reutlingen Gmbh Motor vehicle headlight comprising a multifunctional projection module
US9157595B2 (en) 2010-09-21 2015-10-13 Osram Gmbh Light-emitting device having multiple light source groups
WO2012038173A1 (en) * 2010-09-21 2012-03-29 Osram Ag Light-emitting device
CN102933895A (en) * 2010-09-21 2013-02-13 欧司朗有限公司 Light-emitting device
FR2995662A1 (en) * 2012-06-29 2014-03-21 Valeo Vision Lighting module for projector of car, has secondary light source associated with main lens to generate beam with function codes when main source is activated and secondary source is deactivated, and beam with function of diurnal lighting
FR2995967A1 (en) * 2012-09-24 2014-03-28 Valeo Vision Lighting module, in particular for a motor vehicle
EP2711611A1 (en) * 2012-09-24 2014-03-26 Valeo Vision Lighting module, in particular for a motor vehicle
CN104421795A (en) * 2013-08-29 2015-03-18 现代摩比斯株式会社 Lamp for vehicle
CZ305372B6 (en) * 2013-11-22 2015-08-19 Varroc Lighting Systems, s.r.o. Motor vehicle headlight
US9366405B2 (en) 2013-11-22 2016-06-14 Varroc Lighting Systems, s.r.o. Headlamp system for motor vehicles
DE102013225950B4 (en) * 2013-12-13 2017-06-01 Automotive Lighting Reutlingen Gmbh Automotive lighting device
DE102013225950A1 (en) * 2013-12-13 2015-06-18 Automotive Lighting Reutlingen Gmbh Automotive lighting device
CN105371204A (en) * 2014-08-11 2016-03-02 株式会社小糸制作所 Vehicle lamp
US9714747B2 (en) 2014-08-11 2017-07-25 Koito Manufacturing Co., Ltd. Vehicle lamp
EP3115683A1 (en) * 2015-07-10 2017-01-11 Valeo Vision Lighting module for lighting and/or signalling of a motor vehicle
FR3038696A1 (en) * 2015-07-10 2017-01-13 Valeo Vision Luminous module for lighting and / or signaling of a motor vehicle
CN105805669A (en) * 2016-03-30 2016-07-27 奇瑞汽车股份有限公司 LED dipped headlight light distribution device

Also Published As

Publication number Publication date
AT337518T (en) 2006-09-15
PL1500869T3 (en) 2006-12-29
JP4460966B2 (en) 2010-05-12
FR2858042A1 (en) 2005-01-28
DE602004002043T2 (en) 2007-04-12
JP2005044809A (en) 2005-02-17
ES2271804T3 (en) 2007-04-16
FR2858042B1 (en) 2005-09-23
DE602004002043D1 (en) 2006-10-05
EP1500869B1 (en) 2006-08-23

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