Pivoting mounting of a lighting module for motor vehicles

Abstract

The present invention concerns a lighting and/or signalling device including at least one lighting and/or signalling module. The module including at least one light source, a heatsink thermally coupled to the light source or sources to cool it or them, and optical means adapted to deflect the light rays from the light source or sources to form a light beam along an optical axis of the module. The module is pivotably mounted on a support of the device via its heatsink.

Claims

1. A lighting and/or signalling device for motor vehicles comprising: at least one lighting module adapted to emit a light beam and including a heatsink; and a support; wherein said at least one lighting module is mounted to pivot on said support via said heatsink; wherein said support includes a cradle on which said heatsink of said at least one lighting module is pivotably mounted, said cradle being made of electrically insulative material; wherein said cradle forms two arms extending laterally on either side of said heatsink; wherein said heatsink of said at least one lighting module includes laterally, on each side, a trunnion cooperating with one of said arms; wherein at least one, notably each, of said two arms includes surfaces for guiding said corresponding trunnion of said heatsink relative to said cradle to fit said at least one lighting module; wherein said at least one lighting module has lateral retaining means of said arms relative to said at least one lighting module; wherein said at least one lighting module includes a mask including said lateral retaining means, said means forming surfaces for retaining said arms on said mask.

2. The lighting and/or signalling device according to claim 1, wherein said at least one lighting module has an optical axis and pivots about an axis transverse to said optical axis of said at least one lighting module.

3. The lighting and/or signalling device according to claim 1, wherein said mask includes an aesthetic portion intended at least to mask said heatsink, said lateral retaining means extending on either side of said mask from the aesthetic portion parallel to said arms of said cradle.

4. The lighting and/or signalling device according to claim 1, wherein each of said lateral retaining means extends so as to cover said arm that said retaining means are intended to retain.

5. The lighting and/or signalling device according to claim 1, wherein said cradle includes a base connecting said two arms, said base including positioning means for positioning it on or fixing means for fixing it to said support.

6. The lighting and/or signalling device according to claim 1, wherein said at least one lighting module includes at least one light source thermally coupled to said heatsink of said module.

7. The lighting and/or signalling device according to claim 6, wherein said at least one lighting module including said at least one light source includes optical means adapted to deflect the light rays from said at least one light source to form a light beam along an optical axis of said at least one lighting module.

8. The lighting and/or signalling device according to claim 1, wherein said at least one lighting module including said least one light source and optical means for forming said light beam, said at least one light source, said heatsink and said optical means of said at least one lighting module form a rigid assembly adapted to pivot relative to said support.

9. The lighting and/or signalling device according to claim 2, wherein said support includes a cradle on which said heatsink of said at least one lighting module is pivotably mounted, said cradle being made of electrically insulative material.

10. The lighting and/or signalling device according to claim 5, wherein said fixing means fixes said base to a plate of said support.

11. A lighting and/or signalling device for motor vehicles comprising: at least one lighting module adapted to emit a light beam and including a heatsink; and a support; wherein said at least one lighting module is mounted to pivot on said support via said heatsink; wherein said support includes a cradle on which said heatsink of said at least one lighting module is pivotably mounted, said cradle being made of electrically insulative material; wherein said cradle forms two arms extending laterally on either side of said heatsink; wherein said heatsink of said at least one lighting module includes laterally, on each side, a trunnion cooperating with one of said arms; wherein at least one, notably each, of said two arms includes surfaces for guiding said corresponding trunnion of said heatsink relative to said cradle to fit said at least one lighting module; wherein said at least one lighting module has lateral retaining means of said arms relative to said at least one lighting module; wherein there are at least two modules and they are lighting modules, a first of said modules being mounted in a non-pivotable manner on said support, at least a second one of said modules being mounted in a pivotable manner, said first module being adapted to produce a first beam with at least one of a right-hand cut-off or no cut-off, said second module being adapted to produce a second lighting beam with a cut-off and an offset, and in that said device is capable of producing a lighting function of a low beam type by superposition of said first and second beams.

12. A lighting and/or signalling device for motor vehicles comprising: at least one lighting module adapted to emit a light beam and including a heatsink; and a support; wherein said at least one lighting module is mounted to pivot on said support via said heatsink; wherein said support includes a cradle on which said heatsink of said at least one lighting module is pivotably mounted, said cradle being made of electrically insulative material; wherein said cradle forms two arms extending laterally on either side of said heatsink; wherein said heatsink of said at least one lighting module includes laterally, on each side, a trunnion cooperating with one of said arms; wherein at least one, notably each, of said two arms includes surfaces for guiding said corresponding trunnion of said heatsink relative to said cradle to fit said at least one lighting module; wherein said at least one lighting module has lateral retaining means of said arms relative to said at least one lighting module; wherein said at least one lighting module has an optical axis and pivots about an axis transverse to said optical axis of said at least one lighting module; wherein there are at least two modules and they are lighting modules, a first of said modules being mounted in a non-pivotable manner on said support, at least a second one of said modules being mounted in a pivotable manner, said first module being adapted to produce a first beam with at least one of a right-hand cut-off or no cut-off, said second module being adapted to produce a second lighting beam with a cut-off and an offset, and in that said device is capable of producing a lighting function of a low beam type by superposition of said first and second beams.

Description

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

(1) FIG. 1 is a general view of a motor vehicle headlamp conforming to the invention;

(2) FIG. 2 is a detail view of a lighting module of the FIG. 1 headlamp; and

(3) FIG. 3 is a perspective view from behind and from below of the FIG. 2 module.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(4) FIG. 1 shows a lighting device, to be more precise a motor vehicle headlamp 2. The headlamp 2 is shown in perspective from in front and from the right. Here it is a right-hand headlamp, represented without the outer lens closing the housing 4. The latter accommodates three lighting modules 6, 8, 10. These three modules 6, 8, 10 provide the high beam and low beam type lighting functions. The low beam type lighting function corresponds to essentially horizontal lighting with a cut-off intended for passing other vehicles if the high beam type lighting function has no cut-off and illuminates higher and therefore farther, this function being reserved for driving without passing other vehicles.

(5) Of these three modules 6, 8, 10, a first module is able to produce a lighting beam with a right-hand and horizontal cut-off, a second module is able to produce a lighting beam with a horizontal cut-off with an offset and the third module is able to produce a lighting beam with no cut-off. The low beam type lighting function can then be provided by the first and second modules in combination. Similarly, the high beam type lighting function can be provided by the first and third modules in combination. The lighting functions are therefore provided by superposing two beams.

(6) The three modules 6, 8, 10 are mounted on a support 12 that is preferably common to the three modules 6, 8, 10. For the superposition of the beams from the different modules 6, 8, 10 to be satisfactory, it may be necessary to adjust the beams relative to one another, notably vertically. To this end, at least one of the modules 6, 8, 10, preferably at least two of the modules 6, 8, 10 when there are three of them, may be mounted to pivot about a generally horizontal axis in order to be able to adjust the beam in a vertical direction.

(7) The mounting of the module 6 on its support 12 is described with reference to FIGS. 2-4, on the understanding that this form of mounting is equally applicable to each of the other modules 8, 10.

(8) FIG. 2 is a detail view of the lighting module 6. It includes a heatsink 14, also known as a heat dissipater, supporting one or more light sources (not visible). It also includes optical means adapted to reflect and/or to deflect the rays produced by the light source or sources in order to form a lighting beam. The optical means may include a reflector (not visible) and a lens 16. These various components are well known in themselves to a person skilled in the art. These various components of the lighting module 6 form a rigid assembly mounted to pivot on the support 12 via the cradle 20.

(9) The heatsink 14 extends longitudinally under the lighting module 6 and includes two trunnions 14.sup.1 cooperating through rotary engagement with arms 20.sup.1 of the cradle 20. These arms 20.sup.1 may further include guide surfaces 20.sup.2 intended to facilitate fitting the lighting module 6, more particularly fitting the trunnions 14.sup.1 of the heatsink 14 in their respective housings in the arms 20.sup.1. The guide surfaces 20.sup.2 are in fact directed so as to diverge towards the front of the lighting module 6 and the headlamp 2, thus enabling the lighting module 6 to be fitted by a movement for the most part longitudinal towards the rear.

(10) The cradle 20 is preferably made from an electrically insulative material, such as in particular a plastic material. The heatsink 14 is made from a thermally conductive material, notably a metal, such as aluminum, for example. The at least one light source is preferably of the light-emitting diode type. Such light sources require cooling, which is provided by the heatsink 14. The light sources can therefore be mounted directly on the heatsink 14 in order to maximize the transfer of heat. To this end, the light source or sources may be mounted directly on the heatsink 14, and so the latter may be at the electrical potential of one of the power supply conductors of the sources.

(11) It may therefore be necessary to insulate the heatsink 14 electrically from the rest of the headlamp 2, more particularly the support 12. The latter may in fact be made of metal, more particularly of sheet metal for reasons essentially of cost and stiffness.

(12) The lighting module 6 may also include a part 18 serving not only as a shield but also to retain the arms 20.sup.1 of the cradle 20 via its portions 18.sup.1. In fact, when placing the lighting module 6 on the support 12 via the guide surfaces 20.sup.2, the arms 20.sup.1 of the cradle 20 are elastically deformed so as to move away from the heatsink 14, in an essentially transverse direction, thereafter to return to a position close to the initial position when the trunnions 14.sup.1 are engaged in the corresponding housings in the arms 20.sup.1. To prevent any untimely spreading apart of the arms 20.sup.1, the part 18 may be fitted to the lighting module 6 after fitting the lighting module 6 to the cradle 20, the part 18 including laterally on either side of the heatsink 14 of the lighting module 6 a portion 18.sup.1 forming a retaining lug. This lug extends parallel to an upper portion of an arm 20.sup.1 and externally of the portion. The part 18 is represented by virtue of transparency in FIG. 2.

(13) A device 22 is provided for adjusting the lighting module 6 relative to the support 12. It may electrical or mechanical. It may include a mobile part mechanically connected to a portion of the lighting module 6 at a distance from the pivot axis defined by the trunnions 14.sup.1 and the cradle 20. This mechanical connection may be a ball-joint connection. The movement of the mobile part therefore makes it possible to modify the inclination of the lighting module 6 relative to its pivot axis.

(14) The range of pivoting of the lighting module 6 is limited, for example to less than 20°, preferably less than 15°, more preferably less than 10°. Means for damping the pivoting movement may be provided between the heat sink 14 and the support 12. To be more specific, one or more shoes (not shown) may be provided between the lower face of the heatsink and the support 12, the shoe or shoes being made from an elastically deformable material with a damping component, such as an elastomer and/or fibrous material, for example.

(15) FIG. 3 is a detail perspective view of the lighting module 6 from behind and below the lighting module 6. It can be seen that the cradle 20 includes a base 20.sup.3, the base 20.sup.3 and the arms 20.sup.1 having a U-shaped profile adapted to receive the lighting module 6, to be more precise the heatsink 14 of the lighting module 6. The base 20.sup.3 may include centering pins 20.sup.4 cooperating by engagement with corresponding orifices in a plate of the support 12. In a similar way, fixing means such as fixing screws may be used to fix the base 20.sup.3 to the plate of the support 12. These fixing means cooperate with orifices in the base 20.sup.3 of the cradle 20 and in the plate of the support 12.

(16) The portions 18.sup.1 of the part 18 can be seen in FIG. 3. The portions 18.sup.1 more precisely form notches with which projecting portions of the arms 20.sup.1 of the cradle 20 cooperate. These notches are open towards the rear of the lighting module 6 to enable their placement via the part 18 in a longitudinal rearward direction.

(17) While the system, apparatus, process and method herein described constitute preferred embodiments of this invention, it is to be understood that the invention is not limited to this precise system, apparatus, process and method, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.