JP2005044809A - Elliptical lighting module without shielding emitting a lighting beam having a cut off and headlight provided with the module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a main beam function and a dipped beam function while reducing loss of light energy emitted by a light source. <P>SOLUTION: A lighting module (10) for an automobile is provided with two elliptical reflectors (12) (12') arranged almost along a horizontal optical axis (A-A) in a longitudinal direction from back to front, two light sources (14) (14') arranged near first focal points (F1) (F1') of each reflector (12) (12') respectively and a converging lens (16) whose focal plane is arranged near a second focal point (F2) of the first reflector (12). In the lighting module for a headlight of the automobile (10), the first reflector is also provided with a horizontal plane reflecting surface (22), and a top surface (24) of the reflecting surface generate the cut off type lighting beam which is reflexible. In this invention, the second light source generates the light beam only for the second reflector (12'), and at least one of the light sources (14) (14') consists of a light emitting diode. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an illumination module and an automotive headlight.

  More particularly, the present invention relates to an ellipsoidal reflector (reflector) that defines a reflective space for light rays, generally from the rear to the front, substantially along the longitudinal horizontal optical axis, and comprising a substantially elliptical reflective surface. ) And at least one light source near the first focal point of the reflector and a converging lens whose focal plane is located near the second focal point of the reflector The present invention relates to a lighting module for a headlight of an automobile.

  An elliptical type headlight for generating an illumination beam with a cutoff or a headlight with an image reproducing optical system is well known.

  An illumination beam with a cut-off means a beam that includes a directivity limit, ie a cut-off, in which the light intensity at the top is weak.

  Examples of dip beam, fog light and low beam functions include an illumination beam with a cutoff according to current European regulations.

  In general, in an elliptical headlight, the cut-off is generated by a shield formed by a vertical plate with a matched profile. This shield is sandwiched between the elliptical reflector and the converging lens and is located near the second focal point of the reflector.

  This shield darkens the light generated by the light source and reflected by the reflector towards the bottom of the focal plane of the converging lens, and this light is emitted above the cutoff by the headlight if there is no shield. Will be.

  One drawback of this type of headlight is that most of the light energy emitted from the light source is dissipated at the back of the shield. Furthermore, this type of module does not have a dual function, ie a main beam function and a dip beam function.

U.S. Pat. No. 4,914,747 provides a solution to this problem.
In this specification, two reflectors of the elliptical type, each substantially delimiting a reflective space for light rays, substantially along the longitudinal horizontal optical axis, each defining a reflective space for light rays and having a substantially elliptical reflective surface And two light sources respectively disposed near the first focal point of each reflector, and a focal plane having a converging lens disposed near the second focal point of the first reflector, the first reflector comprising: A horizontal planar reflective surface, the top surface of the reflective surface being reflective, the reflective surface defining a vertical and lower boundary of a reflective space of a beam generated by the first light source; One reflector is further provided with a front end edge, called a cut-off edge, located near the second focal point of the reflector, so as to form a cut-off in the illumination beam. Automotive lighting module of the headlight for generating an illumination beam of the type with a cut-off is described.

  According to this prior art, the first light source formed by the filament is provided with a bottom cap that generates a single upward beam generated from this light source. Accordingly, the first elliptical reflector associated with the first light source can be suitably designed according to the first light source to satisfy the dip beam function.

  On the other hand, the second light source, such as a filament, can also emit light upward and downward. If the second reflector associated with the second light source can be optimally designed according to the second light source to satisfy the main beam function so as to satisfy the main beam function, the upper beam constituted by the selection of the second light source and the second beam By selecting one light source, a part of the light source is formed and reflection at the first reflector occurs. If this single reflected beam is involved in the main beam function, this function cannot be optimized as it depends on the criteria associated with the dip beam with respect to the first reflector.

  As a result, the effects obtained by chance must be combined without being controlled, or trials to obtain a required function must be performed many times.

  The present invention solves this problem, and for this reason, in the present invention, each of which demarcates the reflective space for the light beam, substantially from the rear to the front substantially along the longitudinal horizontal optical axis, and substantially Two elliptical reflectors with an elliptical reflective surface, two light sources respectively located near the first focus of each reflector, and a focal plane located near the second focus of the first reflector The first reflector also includes a horizontal planar reflective surface, the top surface of the reflective surface is reflective, and the reflective surface reflects the beam generated by the first light source. Defining a vertical and lower boundary of the space, the first reflector further comprising a front end edge, referred to as a cut-off edge, disposed near the second focal point of the reflector; In an illumination module for a headlight of an automobile that generates an illumination beam of the type having a cutoff, the planar surface of the reflector being arranged in a horizontal plane substantially passing through the focal point of the first reflector, the second light source However, the present invention proposes a lighting module for an automobile, which generates a light beam only on the second reflector, and at least one of the light sources comprises a light emitting diode.

  Thus, each light source emits light separately in a semi-reflective space delimited by a corresponding elliptical reflector. This makes it possible to easily and accurately control its function and light emission.

  With the lighting module according to the invention, in order to fulfill the dual function of the lighting according to the relevant traffic rules, preferably the main beam function, and the dip beam function, most of the luminous flux emitted by each light source is generated by the module. Used in the light beam.

  According to a preferred embodiment, the device comprises two light sources separated by an opaque cowling.

  Preferably, the second focal point of the first elliptical reflector and the second focal point of the second elliptical reflector are substantially integrated.

  The horizontal planar reflective surface, the top surface of which is reflective, preferably consists of a transparent part that supports the reflective coating.

  Due to this property, the light beam reflected by the first reflector can limit the hole corresponding to the image of thickness on the reflecting surface, that is, the dead light zone, to the thickness of the reflective coating. This reflective coating can be produced, for example, by vacuum evaporation of aluminum and has a thickness of about 500 nm to about several micrometers with a size of several visible wavelengths.

  The transparent component also has an optical function related to the light beam reflected by the second reflector. This is because the transparent part passes through the optical beam.

  In order to limit the optical loss of this passage, the transparent part preferably has a spherical bottom surface centered on the second focal point of the second elliptical reflector.

  Therefore, the light beam emitted by the reflection at the second reflector is perpendicular to this bottom surface.

  The substantially elliptical surface of the first reflector is formed by a rotation angle sector of a substantially rotating part centered on the longitudinal axis. This rotational angle sector preferably extends vertically above the planar surface of the reflector.

  The substantially elliptical surface of the second reflector is preferably formed by a rotation angle sector of a substantially rotating body centered on a so-called rotation axis.

  The optical axis of the first reflector and the rotation axis of the second reflector are preferably secant lines.

Another feature of the present invention is as follows.
The planar surface of the reflector extends longitudinally rearward from its cut-off edge to at least a point near one focal point of the reflector.

  The light source is arranged in the module so that the light diffusion axis of the light source associated with the first reflector is substantially perpendicular to the planar surface of the reflector.

  The cut-off edge of the planar surface of the first reflector has a profile that is curved in the horizontal plane to approximately follow the curvature of the focal plane of the lens.

  The invention also relates to an automotive headlight comprising at least one illumination module as described above for a dual illumination function.

  This dual function preferably includes a dip beam mode illumination function and a main beam mode illumination function.

  Other features and advantages of the present invention will become apparent from the following detailed description when read in conjunction with the accompanying drawings.

  FIG. 1 schematically shows a lighting module 10 manufactured according to the present invention.

  This illumination module is arranged in the vicinity of the first reflector 12 of the elliptical type arranged from the rear to the front along the longitudinal horizontal optical axis AA and the first focal point F1 of the first reflector 12 as usual. The first light source 14 and a converging lens 16 having a focal plane disposed near the second focal point F2 of the first reflector 12 are provided.

  The second reflector 12 and the lens 16 form a part of the optical system of the illumination module 10.

  In this example, the optical axis AA defines the horizontal direction in the longitudinal direction and the direction from the rear to the front without limiting the invention. The direction from the rear to the front corresponds to the left-to-right distribution in the figure. This optical axis AA is substantially parallel to the longitudinal axis of a vehicle (not shown) equipped with the illumination module 10, for example.

  In the remainder of this specification, without limiting the invention, the vertical orientation will correspond to the orientation from the top to the bottom in FIG.

  The focusing lens 16 is a rotating body portion centered on the longitudinal optical axis AA. This lens 16 is provided with a transverse entrance surface 17 for the light beam, facing the first reflector 12.

  According to the embodiment shown here, the first reflector 12 comprises an elliptical surface 18 manufactured as a rotational angle sector of a substantially rotating body part, which elliptical surface 18 has a longitudinal optical axis A−. It extends into a half space located above the horizontal horizontal plane passing through A.

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

  The elliptical surface 18 may not be completely elliptical and follows some “dip beam” illumination function generated by the module 10 to optimize the light distribution of the illumination beam generated by the module 10. May have a different profile. This therefore means that the reflector is not a complete rotating body.

  In accordance with the subject matter of the present invention, the first reflector 12 includes a flat horizontal surface 22 whose top surface 24 is reflective.

  The first reflector 12 defines the boundary of the reflection space for the light emitted by the first light source 14. That is, the boundary of the space where light rays are emitted and reflected is defined. In this reflection space, the boundary of the top portion is defined by the inner reflection surface 20 of the elliptical surface 18, and the boundary of the vertical lower portion is defined by the reflection surface 24 of the plane 22.

  The plane 22 here extends in the axial horizontal plane.

  2 to 7 show only the first reflector 12, the lens 16, and the plane 22.

  The plane 22 is defined by an elliptical edge 26 at the intersection of the rear part with the elliptical surface 18, and the boundary up to the front is defined by a front longitudinal end edge 28. In a variant, the plane 22 can be bounded to the rear by a straight line segment that is perpendicular to the axis A-A and passes near the light source 14 in front of the light source 14.

  The front end edge 28 of the plane 22 is located near the second focal point F2 of the reflector 12 and forms a sufficiently sharp cut-off in the illumination beam generated by the illumination module 10.

  Accordingly, in the remainder of this specification, this front end edge 28 is referred to as a “cut-off edge 28”.

  The focal plane of the lens 16 in the horizontal plane passing through the focal point F2 of the lens 16 forms a curved profile that is concave forward. In this embodiment, the curved shape of this profile is somewhat complex and resembles an arc as a first approximation, so that the cut-off edge 28 follows a horizontal plane so that it approximately follows the focal plane profile of the lens 16. It is preferred to have a curved profile at

  In the embodiment shown herein, the reflective plane 22 comprises a quasi-elliptical posterior portion 30, the boundary of which is defined by the diameter 32 of the ellipsis edge 26 and the quasi-circular front edge 34 of the elliptical surface 18. Yes.

  The reflective plane 22 includes a generally trapezoidal isosceles front portion 36 that is bounded by a diameter 32 of the elliptical surface 18, two lateral edges 38, 40, and a cutoff edge 28. .

  According to the embodiment shown herein, the lateral width of the front portion 36 gradually widens forward, so that the lateral width of the cut-off edge 28 depends on the input surface of the lens 16. Is approximately the same diameter as

  According to the variant shown in FIG. 3, the plane 22 can only contain the front part 36. The front portion 36 extends axially rearward from the cut-off edge 28 to a predetermined point on the optical axis AA located between the first focal point F1 and the second focal point F2 of the reflector 12. Yes.

  The light source 14 emits light energy into at least one half space located above the plane 22 and emits light energy toward the inner surface 22 of the elliptical surface 18.

  The light source 14 is preferably a sealed light emitting diode 44.

  The light emitting diode 44 means not only a junction that generates light energy but also a light emitting globe or cap that surrounds the top portion of the junction.

  The light emitting diode 44 is conventionally attached to the electronic support plate 42 shown in FIG. 4, and the support plate 42 is arranged below the plane 22 in parallel.

  The light emitting diode 44 has a light emitting axis B-B substantially perpendicular to the plane 22.

  The light emitting diode 44 emits light energy at a solid angle of less than 180 degrees with the light emitting axis BB approximately at the center.

  With this structure, the diode 44 can emit most of the light energy toward the inner surface 20 of the elliptical surface 18.

  The operation principle of the light emitting module 10 according to the present invention is as follows.

  Assume that the light source 14 has a slight width around a point that is integrated with the first focal point F 1 of the elliptical reflector 18.

  Consider first the light beam emitted by the light source 14, passing over the cut-off edge 28 and labeled as the primary light beam R1.

  Since the light source 15 is disposed at the first focal point F 1 of the elliptical reflector 18, most of the primary ray R 1 emitted by the light source 14 is reflected by the inner surface 20 of the elliptical surface 18, and then the first level of the reflector 18. Returned to or near bifocal point F2.

  These primary rays R1 form a concentrated light image at the focal point F2 of the lens 16, and this light image is substantially parallel to the longitudinal axis A-A and directed downward by the lens 16 in front of the illumination module 10. Projected in the direction.

  Secondly, a light ray R2 (hereinafter referred to as a secondary light ray R2) emitted from the light source 14 passing under the cut-off edge 28 when it is assumed that there is no plane 22 is considered.

  Since the secondary ray R2 is reflected toward the reflection plane 22 by the inner side surface 20 of the elliptical surface 18, the secondary ray R2 is reflected twice forward.

  During the second reflection, the secondary ray R2 is reflected toward the top portion of the input surface 17 of the lens 16. Therefore, due to the convergence property of the lens 16, the secondary ray R2 is deflected downward. Therefore, the secondary ray R2 is emitted below the cutoff in the illumination beam in the same zone as the ray R1 is emitted.

  The closer the reflection location on the plane 22 of the secondary ray R2 is to the cutoff edge 28, and thus the closer to the focal plane of the lens 16, the more the direction of the secondary ray R2 at the exit of the lens 16 is the longitudinal direction. It approaches in a direction parallel to the axis AA.

  One advantage of the illumination module 10 according to the present invention is that a significant portion of the light emitted by the light source 14 is not darkened, as is the case with conventional illumination modules that include a shield.

  This reflection plane 22 makes it possible to bend the image of the light source 14 reflected by the elliptical surface 18 of the reflector 12 at the second focal point F2 of the reflector 12.

  The reason is that in the absence of the plane 22, some of these images must straddle the limit point formed by the cut-off edge 28 in the vertical plane where the cut-off edge 28 occurs. Each light image includes a top portion located above the cut-off edge 28 and a bottom portion located below the cut-off edge 28. The reflection plane 22 reflects the bottom portion of each image upwards as if the bottom portion was folded at the top portion, so that this light image portion is cut in the vertical plane where the cut-off edge 28 occurs. Overlaid above the off-edge 28.

  The folding part formed by folding the optical image is useful for forming a sharp cut-off part in the illumination beam projected by the lens 16.

  The lighting module 10 according to the present invention also has certain advantages associated with the use of a light emitting diode 44 as the light source 14 in the lighting module.

  The reason is that the image of the virtual light source corresponding to the diode diffuses almost circularly.

  To generate a cut-off in the illumination beam from an illumination module that uses a light source and a Fresnel lens, or that uses a light source and a complex surface type reflector, it works to enable the illumination beam to meet traffic rules It is necessary to align the edges of the image of the light source on the measurement screen.

  When the light source is a filament, the virtual image has a substantially rectangular shape, and a sharp cut-off can be generated relatively easily by manufacturing a rectangular edge.

  When the light source is a diode, it is more difficult to obtain a sharp cut-off by aligning the corresponding images with rounded shapes.

  This problem can be solved by using a diaphragm and a diode, but a significant amount of the optical image generated by the diode is lost.

  With the illumination module 10 of the present invention, a sharp cut-off can be generated by the diode 44. The reason is that the diode projects the image of the edge of the optical system 11, that is, the image of the cutoff edge 28 to the front.

  Accordingly, the shape of the cutoff in the illumination beam is determined by the profile of the cutoff edge 28 in the projected image in the vertical and lateral planes.

  Another problem in manufacturing lighting modules from diodes arises from the non-uniform distribution of light energy in the light beam emitted by the diodes. It is therefore very difficult to generate a uniform illumination beam from a direct image of the diode.

  The illumination module 10 of the present invention solves this problem by taking advantage of the properties of an elliptical illumination module that “mixes” the image of the light source at the second focal point F2 of the reflector 12, thereby generating the illumination generated. The problem of beam uniformity is improved.

  One advantage of the illumination module 10 of the present invention is to take advantage of the nature of the encapsulated diode 44 that emits light in approximately a half space. As a result, more than 80% of the luminous flux emitted from the diode 44 can be captured, and less than 50% of the luminous flux can be captured in the conventional dip beam elliptical headlight.

  According to the first embodiment shown schematically in FIGS. 2 to 4, the lighting module 10 is manufactured by assembling the individual parts.

  The illumination module 10 includes, for example, an element 18 that forms an elliptical portion of the reflector 12, an element 22 that forms a plane of the reflector 12, and an element 16 that forms a converging lens.

  The inner surface of the oval portion 18 and the top surface of the plane 22 are coated with, for example, a reflective material.

  In the case where the light source 14 is a light emitting diode 44, in view of the fact that the amount of heat dissipation of this type of light source is small compared to a lamp, individual parts can be manufactured, for example as polymer parts assembled by fitting.

  The lens 16 can be a Frennel lens.

  According to another embodiment of the invention schematically illustrated in FIG. 5, the optical system 11 of the illumination module 10 is manufactured as a solid integral optical component made of a transparent material, for example PMMA (potimethyl methacrylate). Yes.

This solid optical component is manufactured, for example, by molding or machining.
In the reflection space bounded by the reflector 12, on the outer surface of the elliptical portion 18 of the reflector 12 and the outer surface of the plane 22 of the reflector 12, in this example the bottom, to allow reflection of light rays emitted by the light source 14. , Coating reflective material.

  Total reflection in a medium having a higher refractive index than air so as to cause reflection of light into a reflective space delimited by the reflector 12 without using a reflective material for a given portion of the reflector 12 Properties can be used. These portions of the reflector 12 have a shape slightly different from a pure ellipse.

  According to the second embodiment, the light beam emitted from the light source 14 propagates in the material constituting the optical system 11 of the illumination module 10, and then exits the optical system 11 through the front surface of the focusing lens 16.

  In the first embodiment, the light beam propagates in the air. In the second embodiment, the light beam propagates in a certain material, which has a considerable influence on the operating principle of the lighting module 10 according to the present invention. It is not a thing.

  The reflection plane 22 preferably includes a cavity having a shape complementary to the cap of the light emitting diode 44.

  For example, when the cap of the diode 44 is hemispherical, the cavity is also substantially hemispherical.

  In the modification of the second embodiment, the reflector 12 is manufactured as an integral part from a transparent material different from the part forming the converging lens 16.

  According to the variant embodiment of the invention shown in FIG. 6, the light source 14 can be manufactured with several 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 generally located at the first focal point F1 of the reflector 12.
For example, according to FIG. 6, the two diodes 44 are preferably aligned in a direction perpendicular to the longitudinal optical axis A-A.

  The light source 14 obtained as a result is equivalent to a light source having a long length because the illumination beams emitted from the light emitting diodes 44 overlap.

  Therefore, by arranging the diode 44 in this way, the light beam generated by the illumination module 10 can be expanded.

  In order to fulfill a traffic regulation-compliant lighting function, such as a “dip beam” lighting function, with a cut-off, the vehicle headlight is preferably produced by several identical lighting modules that function simultaneously.

The illumination modules 10 are arranged in parallel. That is, the optical axes AA are substantially parallel to each other.
Thus, the illumination beam produced by each of the illumination modules 10 is superimposed in front of the vehicle so as to generate an illumination beam that satisfies a traffic rule having a cutoff.

  For example, FIG. 7 shows an automotive headlight 46 that satisfies the dip beam function and uses the same four lighting modules 10.

  The dip illumination beam includes a cut-off having a portion that is inclined at a predetermined angle, for example 15 degrees, so that the two illumination modules 48 of the headlight 46 are only 15 degrees around their longitudinal optical axis A-A. Rotate to produce an illumination beam with a cutoff that is inclined by 15 degrees relative to a horizontal plane.

  The other two illumination modules 50 form an illumination beam with a horizontal cut-off.

  The superposition of the illumination beams generated by the four illumination modules 10 forms an illumination beam that satisfies traffic rules with a horizontal portion and a portion that is inclined by 15 degrees.

  According to a modified embodiment (not shown) of the present invention, the light source 14 can be formed by the free ends of the optical fiber clusters.

  One drawback of optical fibers is that the sheath surrounding the fiber core forms a light beam with a bright core and a dark annulus.

  Thus, this type of light source, for example when used in automotive headlights using complex surface type reflectors, forms a pixel-like image in the illumination beam surrounded by a dark area by means of a sheath.

  One advantage of the optical module 10 according to the present invention is that all images of the light source 14 can be mixed at the second focal point F2 of the reflector 12 so that no fiber optic pixels are found in the illumination beam.

  Reference is now made to FIG. 1 in conjunction with FIG. Furthermore, in addition to what has already been described in detail so far, in order to fulfill the dual function, i.e. the dip function and the main beam function, the module according to the invention, which is adapted to be mounted on the headlight of an automobile, A second reflector of the elliptical type comprising a reflective surface 18 ', 20' which is generally elliptical, defining a reflective space for the light beam, disposed along the longitudinal horizontal optical axis A-A from the back to the front. 12 ′ and a second light source 14 ′ disposed near the first focal point F1 ′ of the second reflector 12 ′. The second light source 14 'emits a single light beam downward.

  The second reflector 12 'and the second light source 14' can be similar to the first light source 18 and the first light source 14, respectively. Therefore, since they have all the corresponding features already described, the description thereof will not be repeated.

  To do this, the two light sources 14, 14 ′ with selective control, preferably two light emitting diodes or two sets of light emitting diodes, are separated by an opaque cowling 60, which is Where possible, heat sinks and control circuitry may be included.

  As can already be seen from the above, the substantially elliptical surface of the reflector 12 is formed by a rotation angle sector of a substantially rotating body centered on the longitudinal optical axis AA, which is the plane of the reflector. It extends vertically above 22.

  A part of the substantially elliptical surface of the second reflector is formed by a rotation angle sector of a substantially rotating body about a so-called rotation axis A′-A ′. The optical axis AA of the first reflector and the rotation axis A′-A ′ of the second reflector are preferably secant lines.

  The second elliptical reflector 12 ′ has a second focal point that is substantially integrated with the second focal point F <b> 2 of the first reflector 12. Therefore, the optical axis AA of the first reflector and the rotation axis A′-A ′ of the second reflector almost intersect each other at the second focal point F2.

  The horizontal reflective surface 22 with the top surface 24 being reflective comprises a transparent component 22 ′ that supports the reflective coating on the top surface and forms the reflective top surface 24. The transparent part 22 'has a spherical bottom surface 22A centered about the second focal point F2. A part of the side surface 22b of the transparent part facing the lens 16 is preferably constituted by a constant surface configured as a vertical plane by a straight line connecting the top edge 34 of the first reflector 12 to the second focal point F2.

  The transparent part 22 'is preferably manufactured from PMMA (polymethyl methacrylate), and the reflective coating is formed by vacuum-depositing aluminum.

  With particular reference to FIG. 4, the optical function of the module has already been described in relation to the first elliptical reflector 12 having an associated reflective surface 22.

  To summarize this function with reference to FIG. 1, while the first light source 14 is functioning, the majority of the primary rays emitted from the light source 14 are reflected by the inner surface 20 of the elliptical surface 18 before the reflector 18. Back toward or near the second focal point F2. Since the secondary rays are reflected by the inner surface 20 of the elliptical surface 18 toward the reflecting surface 22, the second reflection toward the front of these rays is made. Accordingly, the reflecting surface 22 has a folding function.

  FIG. 9 schematically shows a projected image I1 of the light beam emitted from the module 16 and emitted from the module. The first function of this module corresponds to the dip mode of an automobile headlight.

  During the simultaneous switching of the second light source 14 ′, most of the primary ray R 1 ′ emitted by the light source 14 ′ is reflected by the inner surface 20 of the elliptical surface 18 and then returned toward or near the second focus F 2. . These rays perpendicular to the bottom surface 22A of the transparent part 22 'pass through the transparent part without any optical loss, except for the loss due to the reflection of the glass on the surface 22A, and then above the axis AA. Is returned by the lens 16.

  In FIG. 10, a projected image of the light beam emitted by the module output from the lens 16 is shown schematically. An image I2 is added to the previous image I1. This second function of the module corresponds in particular to the main beam function of automobile headlights.

  With respect to the transparency of the part 22 'and the thin and invisible thickness of its reflective coating 24, the two images I1 and I2 are continuous to the eye and form a single light beam. Yes.

1 is a vertical sectional view schematically illustrating a preferred embodiment of a lighting module according to the present invention. 1 is a perspective view partially showing a preferred embodiment of a lighting module according to the present invention. FIG. 2 is a plan view schematically showing the illumination module of FIG. 1. It is a side view which shows schematically the optical path of the light beam in the illumination module of FIG. It is a figure similar to FIG. 2 which shows 2nd Example of the illumination module concerning this invention. FIG. 3 is a view similar to FIG. 2 showing a modified embodiment of the lighting module of FIG. 1 including several light emitting diodes. 1 is a front view of a headlight of a motor vehicle with an illumination module according to the present invention that generates a dip illumination beam that conforms to a rule; FIG. FIG. 2 is a schematic perspective view of the illumination module shown in FIG. 1. 1 is a schematic diagram of a projected image of a light beam emitted by a module according to a first embodiment of the module according to the present invention; 4 is a schematic view of a projected image of a light beam emitted by a module according to a second embodiment of the module according to the present invention;

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Illumination module 12 1st reflector 12 '2nd reflector 14 1st light source 14' 2nd light source 16 Converging lens 18 Elliptical surface 18 '2nd reflector 20 Inner side surface
22 reflective surface 22 'transparent part 22A bottom surface 24 top surface 46 headlight 48 illumination module 50 illumination module 60 cowling A-A optical axis F1 first focus F2 second focus

Claims (13)

Along the longitudinal horizontal optical axis (A-A), from the rear to the front, each delimits a reflective space for light rays, and a substantially elliptical reflective surface (20) (20 '). Two reflectors (12) and (12 ') of the ellipse type provided, and two light sources (14) respectively arranged near the first focal points (F1) and (F1') of the reflectors (12) and (12 ') 14 ′) and a converging lens (16) whose focal plane is located near the second focal point (F2) of the first reflector (12), the first reflector comprising a horizontal planar reflective surface ( 22), the top surface (24) of the reflective surface is reflective, the reflective surface (22) delimiting the vertical and lower boundary of the reflective space of the beam generated by the first light source. The first reflector further includes a reflector With a front end edge (28), called a cut-off edge, located near the two focal points (F2), this planar surface (22) of the first reflector is the first reflector (12) In an automotive headlight illumination module (10) for generating an illumination beam of the type having a cutoff, which is arranged in a horizontal plane substantially passing through the focal points (F1) (F2) of
The second light source is configured to generate a light beam only on the second reflector (12), and at least one of the light sources (14) and (14 ′) includes a light emitting diode. The automotive lighting module (10).   2. Illumination module according to claim 1, characterized in that the two light sources are separated by an opaque cowling (60).   3. The first focal point (F2) of the first elliptical reflector and the second focal point (F2 ') of the second elliptical reflector are substantially integrated. Illumination module (10) as described.   The horizontal planar reflective surface (22), whose top surface (24) is reflective, consists of a transparent part (22 ') that supports the reflective coating. The illumination module (10) according to any one of 3 above.   5. Illumination according to claim 4, characterized in that the transparent part (22) comprises a spherical bottom surface (22A) centered on the second focal point (F2) of the second elliptical reflector (18 '). Module (10).   A substantially elliptical surface (18, 20) of the first reflector (12) is formed by a rotational angle sector of a substantially rotating part centered on the longitudinal axis (AA), and this rotational angle. The lighting module (10) according to any of the preceding claims, characterized in that the sector extends vertically above the planar surface (22) of the reflector (12).   The substantially elliptical surface (18 ′) of the second reflector (12) is formed by a rotation angle sector of a substantially rotating body centered on a so-called rotation axis (A′-A ′). The illumination module (10) according to any one of claims 1 to 6.   The illumination module (10) according to claim 7, characterized in that the optical axis (A-A) and the rotation axis (A'-A ') of the second reflector (18') are secant lines.   The planar surface of the reflector extends longitudinally rearward from its cut-off edge to at least a point near the first focal point (F1) of the reflector (12). Item 9. The illumination module (10) according to any one of items 1 to 8.   The light source (14) such that the light diffusion axis (BB) of the light source (14) associated with the first reflector (18) is substantially perpendicular to the planar surface (22) of the reflector (12). The illumination module (10) according to any one of the preceding claims, characterized in that it is arranged in the module (10).   The cut-off edge (28) of the planar surface (22) of the first reflector (12) has a profile that is curved in a horizontal plane so as to substantially follow the curvature of the focal plane of the lens (16). The illumination module (10) according to any one of claims 1 to 10.   Car headlight (45), characterized in that it comprises at least one lighting module (10) according to any of the preceding claims, which is adapted to perform a double lighting function.   13. The headlight according to claim 12, wherein the dual function includes a dip mode illumination function and a main beam mode illumination function.

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