FR3056700A1 - OPTICAL LIGHTING MODULE, IN PARTICULAR FOR A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a lighting optical module, in particular for a motor vehicle, comprising a first optical element, a second optical element and a support 40, in which the first and second optical elements are arranged one behind the other according to an optical axis A, characterized in that the first and second optical elements are fixed to the support 40 to form with it an optical assembly and in that the support is in one piece.

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to the field of lighting projectors, in particular for a motor vehicle.

The invention relates to a lighting projector in light segments, such as light strips or polygons, comprising a lighting module according to the invention.

TECHNICAL BACKGROUND OF THE INVENTION

A motor vehicle is equipped with headlights, or headlights, intended to illuminate the road in front of the vehicle, at night or in the event of reduced light. These headlamps can generally be used in two lighting modes: a first high beam mode and a second low beam mode. The high beam mode makes it possible to strongly illuminate the road far ahead of the vehicle.

The low beam mode provides more limited illumination of the road, but nevertheless offers good visibility, without dazzling other road users. These two lighting modes are complementary. The driver of the vehicle must manually change modes depending on the circumstances, at the risk of inadvertently dazzling another road user. In practice, changing the lighting mode manually can be unreliable and can sometimes be dangerous. In addition, the low beam mode provides visibility that is sometimes unsatisfactory for the driver of the vehicle.

To improve the situation, headlights with Adaptive Driving Beam, ADB and adaptive lighting have been proposed. Such an ADB function is intended to automatically detect a road user likely to be dazzled by a light beam emitted in high beam mode by a projector, and to modify the outline of this light beam so create a gray area where the detected user is located. The advantages of the ADB function are manifold: user comfort, better visibility compared to lighting in dipped beam mode, better reliability for changing modes, risk of glare greatly reduced, safer driving.

The document EP2743567A1 discloses a motor vehicle headlamp provided with modules generating lighting in light segments in the form of strips through a projection lens. Each module includes a series of light guides for shaping radiation from light-emitting diodes. Thanks to such a projector, it is possible to illuminate an environment using light segments which take the form of vertically oriented light bands whose positions are controlled.

Such an optical module generally comprises a matrix of primary light emission means, generally formed by light-emitting diodes (LEDs), one or more optical elements including a primary optical element provided with a structure for forming segments or luminous pixels and projection optics. The light emitting diodes are arranged on a flat printed circuit board which extends in a plane orthogonal to the direction of projection of the final light beam. The light guides of the primary optical element extend generally longitudinally from an entrance face of the light to an exit face of the light. The light guides are intended to conform the rays emitted by the light-emitting diodes into a narrower light brush having the shape of a pixel, generally rectangular or square. The exit faces of the light guides form the matrix of elementary light sources imaged by the projection optics.

Traditionally, each optical element is fixed to its own support. During the assembly of the optical lighting module, the positioning of the different optical elements is then done by the positioning of each of the optical elements and of its support within the optical lighting module. This type of assembly can sometimes prove to be cumbersome and unsuitable, in particular when several optical elements are arranged between the light-emitting diodes and the projection optics. There is therefore a need to propose an alternative to this type of assembly.

BRIEF SUMMARY OF THE INVENTION

To do this, the invention provides an optical lighting module, in particular for a motor vehicle, comprising a first optical element, a second optical element and a support, in which the first and second optical elements are arranged one behind the another along an optical axis A, characterized in that the first and second optical elements are fixed to the support to form with it an optical assembly and in that the support is in one piece.

According to other characteristics of the invention which can be taken together or separately:

the first and second optical elements are fixed at a predetermined distance h from each other along the optical axis "A", the support is designed so that the distance h between the first optical element and the second element optical is not adjustable, the first and second optical elements are arranged parallel to one another, one of the first or second optical elements on the one hand and the support on the other hand are fixed together by overmolding, at least one of the first or second optical elements is fixed to the support by elastic interlocking, the optical element is fixed to the support in a removable manner, the support comprises at least one fixing means designed to allow the fixing of one of the first and second optical elements to the support, the fixing means is an elastic interlocking means produced in one piece with the rest of the support, the fixing means is designed to hold the first element optically at a predetermined distance from the second optical element, at least one of the first and second optical elements is made of silicone, at least one of the first and second optical elements is a lens, the optical lighting module further comprises at least one light emission means and a projection optic having an optical axis (A), the assembly formed by the optical elements and the support is arranged between the light emission means and the projection optics along the optical axis (A), the first and second optical elements are arranged one behind the other orthogonally to the optical axis (A), the at least one light emitting means comprises light-emitting diodes, the first optical element is designed to modify a distribution of the rays emitted by the at least one emission means, the first optical element comprises at least one light guide, the first optical element comprises a matr of light guides, the second optical element is a field correction lens designed to correct an aberration of field curvature of the projection optics, the projection optics has an object focal surface S, the at least one guide of light from the first optical element comprises output surfaces which are arranged in an emission plane P, the optical lighting module is designed so that the object focal surface S is substantially tangent to the emission plane P, the second optical element is designed to flatten the focal surface object S.

The invention also relates to a lighting device for a motor vehicle comprising an optical module produced according to the teachings of the invention.

BRIEF DESCRIPTION OF THE FIGURES

Other characteristics and advantages of the invention will appear during the reading of the detailed description which will follow for the understanding of which reference will be made to the appended drawings in which:

Figure 1 is a side view of an optical assembly formed of a support and two optical elements;

Figure 2 is a top view of the optical assembly shown in Figure 1;

Figure 3 is a bottom view of the optical assembly shown in Figure 1;

Figure 4 is another side view of the optical assembly shown in Figure 1;

Figure 5 is a perspective view of the optical assembly illustrated in the preceding figures;

Figure 6 is a bottom view in perspective of the support of the assembly illustrated in the preceding figures, in which the two optical elements have not been shown.

Figure 7 is a top view in perspective of the support illustrated in the previous figure;

Figure 8 is another top view and perspective view of the support illustrated in Figure 6;

Figure 9 is a partial perspective view showing an optical lighting module;

Figure 10 is a perspective view which shows a printed circuit board of the optical module of Figure 9 comprising an array of light emitting diodes;

Figure 11 is a perspective view showing the rear of a primary optical element of the optical module of Figure 9 having a plurality of light guides;

Figure 12 is a sectional view along the horizontal section plane 4-4 of Figure 9 in which there is shown in dotted lines the curved object focal surface of the projection optics as well as the plane in which the faces of light guide output from the primary optical element.

DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT OF THE INVENTION

According to the invention, as illustrated in particular in FIGS. 1 to 8, the optical lighting module 10 comprises in particular a support 40, a first optical element 24 and a second optical element 34. The optical elements 24, 34 are for example optical lenses.

The optical module 10 for lighting or signaling for a motor vehicle which is intended to emit a final light beam along an optical axis “A”.

The support 40 allows the immobilization of the first 24 and second 34 optical elements relative to each other. In particular, the first optical element 24 and the second optical element are designed to be fixed both to the support 40.

It is noted that the support 40, the first optical element 24 and the second optical element form an assembly, called an optical assembly.

As will be developed below, the optical lighting module 10 further comprises means 12 for emitting light and a projection optic 14 which is arranged along the optical axis “A” at a distance from the means 12 resignation.

Note that here, when the optical lighting module 10 is assembled, the emission means 12, the first optical element 24, the support 40, the second optical element 34 and the projection optics 14 are designed to be arranged substantially one behind the other and in this order along the optical axis "A".

The support 40 is here designed in a single piece, in particular by molding. The support can for example be made of a plastic material. The support 40 has substantially a general shape of a rectangular parallelepiped or a straight block.

Advantageously, as illustrated in FIGS. 9 and 12, the support 40 allows the first optical element 24 to be maintained at a predetermined distance h from the second optical element 44. It is noted that the support 40 is designed so that the distance h between the first element optic 24 and the second optical element 34 is not adjustable. It is however possible to adjust a distance between the optical assembly and the projection optics 14. The presence of the second optical element 34 allows a certain tolerance in the positioning between the projection optics 14 and the optical assembly.

The fact that the support 40 is in one piece makes it possible to simplify the positioning and assembly of the optical elements relative to the rest of the optical lighting module 10.

As illustrated in particular in FIGS. 6 to 8, the support 40 here comprises a base 42 and a sleeve 44 coming from the base 42. The base 42 is of planar shape and substantially rectangular. The sleeve 44 of the support 40 here extends from an external periphery of the base 42. The sleeve 44 is here integrally formed with the base 44. The sleeve 44 extends along the external periphery of the base 42. The sleeve 44 delimits an interior space of the support 40.

The optical assembly is designed to be arranged so that the base 42 of the support 40 is orthogonal to the optical axis "A".

As illustrated in particular in FIG. 12, it is noted that when the optical assembly is mounted to the rest of the optical lighting module 10, the base 42 of the support 40, the first optical element 24 and the second optical element 34 are all orthogonal or substantially orthogonal to the optical axis "A".

The support 40 here has a height measured in a direction orthogonal to the base

42. The support 40 has a lower face 401 and an upper face 403 and extends along its height between its lower face 401 and its upper face 403.

As illustrated in particular in Figure 6, Here, the sleeve 44 of the support 40 is double. In particular, the sleeve 44 here comprises an internal part 441, an external part 443 and upper part 445. The upper part 445 acts as a material bridge between the internal part 441 and the external part 443. In other words, the external parts 443 and internal 441 are here connected to each other by the upper part 445. It is noted that the upper part 445 of the sleeve is arranged at the level of the upper face 403 of the support 40.

The internal part 441 here extends from the base 42 to the upper part 445. The external part 443 extends, for its part, from the upper part 445 to the lower face 401 of the support

40. In other words, the external part 443 comprises one end, called the low end, and another end, called the high end, and extends substantially from one to the other in a direction substantially parallel to the height of the support 40 We note that the lower end of the external part

443 here corresponds to the lower face 401 of the support 40. The upper end of the external part 443 is, for its part, merged with the upper part 445 of the sleeve 44.

Here, the internal part 441 opens onto an interior space of the support 40. In particular, the internal part 441 thus laterally delimits the interior space of the support 40. The external part 443, it gives onto an external space of the support 40.

It is noted that the internal 441 and external 443 parts can be slightly inclined with respect to each other. They extend here substantially orthogonal to the base 42. The internal parts 441 and external 443 are here concentric. They both extend here around the optical axis "A".

As illustrated in particular in FIGS. 7 and 8, the upper part 445 of the sleeve here comprises a bearing surface 447. The bearing surface 447 is here provided near the upper face 403 of the support 40.

As illustrated in particular in FIGS. 2 and 5, when the second optical element is fixed to the support 40, the support 40 is designed so that the second optical element 34 rests at least partially on the bearing surface 447. We notes that the bearing surface 447 is designed to serve as a stop, in particular along the optical axis, for the second optical element 34. This bearing surface 447 also makes it possible to guarantee an isostatic maintenance of the second optical element

34.

As can be seen, this can be seen in FIG. 8, the sleeve 44 is further provided with a coding means. Here, the coding means is a positioning lug 449.

The positioning lug 449 is here arranged on the support surface 447. In particular, the positioning lug 449 projects here from the support surface 447. The positioning lug 449 is designed to facilitate the positioning of the second optical element 34 when it is fixed to the support 40. More particularly, the positioning lug 449 is here designed so as to cooperate mechanically with a part provided for this purpose of the second optical element 34. As will be seen below, the second optical element 34 is provided at its periphery with a cavity or zone devoid of material designed to cooperate by form fitting with the positioning lug 449 of the support 40. Here, the positioning lug 449 and the cavity or zone devoid of material of the second optical element 34 are of complementary shapes.

As is particularly visible in Figures 4 and 8, the sleeve 44 is further provided with fixing means. The means for fixing the sleeve 44 are here elastic fitting means. They are designed to cooperate mechanically with the second optical element 34 so as to allow its attachment, here in a removable manner, to the support 40. The elastic interlocking means here comprise four flexible tongues 442.

The flexible tongues 442 are branches of substantially longitudinal shape. Here they come from the material with the rest of the support 40. In particular, the flexible tongues 442 come from the external part 442 of the support 40. The flexible tongues 442 extend longitudinally in a manner substantially orthogonal to the base 42. In other words , here, the flexible tongues extend substantially parallel to the optical axis “A”.

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The flexible tabs 442 each include a lower end 4421 and an upper end 4422 and extend longitudinally from one to the other. Flexible tabs

442 extend here from the external part 443 of the sleeve 44.

The external part 443 of the sleeve 44 and each of the flexible tongues are here connected to one another by an embedding connection.

It is noted that the flexible tongues 442 are designed to immobilize the second optical element 34 relative to the support 40. The flexible tongues 442 are designed so as to allow the passage and then the maintenance of the second optical element 44. In particular, the flexible tongues 442 are designed to, from an initial rest position, undergo an elastic bending and substantially towards the outside of the support 40 before returning to their initial rest position.

The flexible tabs 442 further include at their upper end

4423 of a head 4425 designed to block the second optical element 34 once it has been assembled to the support 40. In particular, here, the heads 4425 of the flexible tongues 442 prevent movement of the second optical element 34 notably in a direction orthogonal to the base of the support 40. In other words, the flexible tongues 442 allow axial locking of the second optical element 34.

In particular, the second optical element 34 is blocked in translation in both directions in a direction orthogonal to the base 42 of the support 40 between the bearing surface 447 of the sleeve and the head 4425 of each flexible tongue 442.

The flexible tabs 442 are distributed along the sleeve 44. In particular, the flexible tabs 442 are here arranged at two opposite sides of the sleeve 44. More specifically, each of the flexible tabs 442 is arranged opposite the one of the other flexible tabs 442.

As can be seen in particular in FIGS. 4 and 5, it is further noted that the sleeve 44 further comprises four slots 448. They are arranged along the sleeve 44. Here, the slots 448 are of longitudinal shape. They serve as accommodation for the flexible tabs 442. The slots 448 allow in particular the displacement and / or the deformation of the flexible tabs 442 during the fixing of the second optical element 34. It is noted in particular that each flexible tab 442 is arranged at the one of the zones devoid of material 448 of the sleeve 44.

Advantageously, the spacing between the tongues 442 and the slots 448 is different depending on the side considered so as to serve as polarizing means during assembly.

It will be noted that each of the slots 448 of the sleeve 44 is formed here by zones devoid of material arranged both on the internal part 441, on the external part 443 and on the upper part 445.

In variants not illustrated, the second optical element 34 and the support 40 can be joined by welding, screwing, gluing, overmolding or even by plastic deformation.

As illustrated in particular in Figure 6, the base 42 of the support 40 is here planar or substantially planar. It has a substantially rectangular shape. The base 42 of the support 40 here comprises a central zone 420 devoid of material and designed to serve as a housing for the first optical element 24.

As illustrated in particular in FIG. 3, the first optical element 24 and the support 40 are here fixed to one another by overmolding. In particular, the support 40 is here itself overmolded to the first optical element 24.

In a variant not illustrated, the first optical element 24 is for example fixed to the support by elastic deformation, plastic deformation, welding, bonding or even by screwing.

Once the support 40 is overmolded to the first optical element 24, the first optical element is designed to be immobilized relative to the support and arranged at the level of said central zone of the base 40.

Note that the assembly between the first 24 and second 34 optical elements on the one hand and the support 40 on the other hand is here isostatic or hyperstatic.

As illustrated in particular in FIG. 10, the light emission means 12 here comprise a matrix 16 of elementary primary light emission means 18. These are light-emitting diodes. The matrix 16 is equipped with two transverse rows of seventeen light-emitting diodes. The optical axis A passes substantially in the middle of the matrix 16 in the transverse direction.

The matrix 16 extends in a plane orthogonal to the optical axis. More particularly, the light-emitting diodes 18 are here carried by the front face of a printed circuit card 20.

These light-emitting diodes 18 are capable of emitting heat during their operation. A heat sink 22 comprising cooling fins is therefore attached to the back of the printed circuit board 20 to remove the heat.

As can be seen in particular in FIG. 12, it is noted that the support 40 is here fixed at its lower face 401 to the printed circuit board 20. The support 40 and the printed circuit card 20 are for example joined by gluing.

It will also be noted that, alternatively or cumulatively, the support 40 can be designed to cooperate mechanically with the heat sink 22. In particular, the external part 443 can be designed to cooperate mechanically with means for positioning the heat sink 22.

The light-emitting diodes 18 emit light rays in a very open cone of light. In addition, each light-emitting diode 18 has an emitting surface whose dimensions must be adapted to allow efficient use by the optical lighting module. To this end, the first optical element 24, also called the primary optical element, is designed to modify the distribution of the light rays emitted.

As shown in FIG. 11, the primary optical element 24 here comprises a first rear portion 24A which is formed of a plurality of light guides 26. Each light guide 26 extends along a longitudinal main axis from an entry face 28, to a front end face 30 for exit of the light rays, in particular visible in FIG. 4. Each light guide 26 is designed to guide the rays entering via the entry face 28 to the exit face 30.

In the context of the invention, each outlet face 30 forms an elementary light source which will hereinafter be referred to as elementary light source.

The rear portion 24A comprises a matrix comprising at least as many light guides 26 as the matrix 16 comprises light-emitting diodes 18. Each light guide 26 is associated with a light-emitting diode 18. Thus, the rear portion 24A comprises two rows of seventeen light guides 26.

The entry faces 28 of the light guides 26 are arranged in a common plane which is parallel to the plane of the printed circuit board 20. When the primary optical element 24 is arranged in the optical module 10, each input face 28 is thus positioned longitudinally opposite and near an associated light-emitting diode 18, as illustrated in FIGS. 11 and 12, so that the major part of the light rays emitted by each light-emitting diode 18 enters the associated light guide 26.

As can be seen in FIG. 11, each light guide 26 is capable of having a section adapted to produce a primary elementary light beam emerging from the shape desired for the function of the optical module 10 for lighting or signaling.

The exit faces of the light guides 26, forming elementary light sources, are arranged in a common emission plane P which is parallel to the plane of the printed circuit board 20, as shown in FIG. 12. In this way, the light guides 26 all have an identical length.

The exit faces of the light guides 26 thus form a matrix of elementary light sources, here of two rows of seventeen sources, each of which is capable of emitting a primary elementary beam in a main longitudinal direction of projection from the plane P emission common orthogonal to the longitudinal direction L. The exit faces, forming elementary light sources, are arranged in contact with each other.

The primary optical element 24 also includes a portion 24B before the primary elementary light beams emitted by the elementary light sources are formed. This front portion 24B allows for example to spread the elementary light beams vertically and / or horizontally.

The front portion 24B has a common front end face 32 for the exit of the light rays from the primary optical element.

This front portion 24B is here produced integrally with the light guides 26 so that the primary optical element 24 is produced in one block.

The primary optical element 24 is for example made of silicone, polycarbonate, polymethylmethacrylate (PMMA) or any other material suitable for the production of light guides 26. The projection optic 14 is arranged along the optical axis “A” at a distance from the plane

P of emission. The projection optic 14 is capable of projecting an image of the elementary light sources towards infinity to form the final light beam. In projection on a transverse vertical screen (not shown) located at a great distance, for example at 25 m, each elementary light source makes it possible to illuminate an area of the screen. The areas overlap slightly to provide even lighting. Each diode 18 is individually controlled so as to be able to selectively illuminate each of the areas of the screen.

The projection optic 14 is here produced in a single block.

In known manner, the projection optic 14 has an object focal surface S. The object focal surface S extends generally orthogonally to the optical axis A which it intersects at the object focal point.

In order for the final beam obtained to have the desired light characteristics for its use, it is necessary for the elementary light sources to be imaged in a substantially clear manner. For this purpose, each elementary light source 30 must be located on the focal surface object of the projection optics 14.

Theoretically, the projection optics 14 is supposed to have a plane object focal surface and perfectly orthogonal to the optical axis A. However, in reality, it is known that the projection optics 14 has an object focal surface having a concave spherical curvature defect. Such a defect is called a Petzval field aberration.

The second optical element 34 is designed to allow the projection optics 14 to be correctly focused on the elementary light sources 30. The second optical element is here interposed between the emission plane P and the projection optics 14.

The second optical element 34 here comprises optical field correction means which are specifically designed to correct the aberration of field curvature of the projection optics 14.

The second optical element 34 is shaped so that, viewed from the projection optics 14, the image of the curved focal surface S of the projection optics 14 by the second optical element 34 extends in an object focal plane coincident with the emission plane P of the matrix of elementary light sources. The projection optics 14 will have been previously positioned so that the object focal surface S is tangent to the emission plane P, the second optical element 34 having the effect of flattening the object focal surface S towards the plane P d ' program.

The second optical element 34 is here a field correction lens also known by its English name of field flattener lens and which will be referenced 34 below.

In a variant not shown of the invention, the optical field correction element comprises a plurality of field correction lenses arranged in series along the optical axis.

The field correction lens 34 has a rear face 36 for entering the light rays which is arranged longitudinally at a distance from the emission plane P. The input face 36 of the field correction lens 34 is arranged longitudinally away from the output face 32 of the primary optical element 24. As can be seen in FIG. 12, the input face 36 of the field correction lens is concave in its center near the optical axis A and convex at its periphery radially away from the optical axis.

The field correction lens 34 has a face 38 before the light rays exit. This outlet face 38 is arranged longitudinally opposite and at a distance from the projection optics 14. The outlet face 38 here has a convex shape.

The field correction lens 34 has a height. When the field correction lens 34 is fixed to the support 40, the height of the correction lens 34 is orthogonal to the base 42 of the support 40 and parallel to the optical axis "A".

The field correction lens 34 extends along its height between its entry face 36 and its exit face 38. In other words, the entry faces 36 and exit 38 define a height of the field correction lens 34. It is noted that here the entry face 36 corresponds to one end, called the lower end 341, of the field correction lens 34. The exit face 38 corresponds to another end called the upper end of the correction lens field 34.

Note that the field correction lens 34 is provided with mechanical cooperation means. The mechanical cooperation means are designed to cooperate mechanically with the support 40. Here, in particular, the mechanical cooperation means comprise an external peripheral rim 347. The external peripheral rim 347 is arranged near the lower end of the lens. field correction 34. The external peripheral rim 347 extends along an external periphery of the field correction lens 34 and in a direction substantially orthogonal to the height thereof.

Here, the external peripheral rim 347 of the field correction lens 34 comprises a lower planar face 3471 and an upper planar face 3472. The lower planar faces 3471 and upper 3472 are here parallel to each other. They define between them a thickness of the external peripheral rim 347. It is noted that the thickness of the external peripheral rim 347 here extends parallel to the height of the field correction lens 34.

When the field correction lens 34 is fixed to the support, the lower planar face

3471 of the outer peripheral rim 347 is designed to be in contact with the bearing surface

447 of sleeve 44.

Note that once the field correction lens 34 is assembled to the support 40, the flexible tabs 442 of the sleeve 44 are designed to return to their initial rest position and close above the outer peripheral rim 347 of the lens. field correction

34. The flexible tongues 442 and in particular their heads 4425 thus exert a force against the field correction lens 34 allowing it to be held against the bearing surface 447 of the sleeve 44. The flexible tongues 442 are dimensioned so as to have a stiffness in bending allowing manual mounting of the second optical element 34, for example with an insertion force of less than 30 N.

It is further noted that once the field correction lens 34 fixed to the support 40, the optical assembly is designed so that the head 4425 of each flexible tongue 442 cooperates mechanically with the upper planar face 3472 of the correction lens of fields 34. Here, in particular, the head 4425 of each flexible tab 442 is in contact with the upper planar face

3472.

Once assembled to the support 40, the field correction lens 34 is blocked between the bearing surface 447 of the sleeve 44 and the heads 4425 of the flexible tongues 442.

In addition, the external peripheral rim 347 of the field correction lens 34 comprises a recess 346 at the level of the lower planar face 3471. As mentioned above, the recess 346 is designed to cooperate mechanically with the positioning lug 449 .

The recess 346 of the field correction lens 34 thus facilitates the positioning of the field correction lens 34 when it is fixed to the support 40.

Thanks to the arrangement of the optical element for field correction between the primary optical element 24 and the projection optic 14, it is possible to produce short light guides 26 having an identical length. The primary optical element 24 is thus easier to manufacture.

It is in particular possible to use materials which do not make it possible to obtain long light guides by molding. The primary optical element 24 is thus capable of being obtained in polycarbonate while the primary optical elements according to the state of the art having very long light guides can only be produced in silicone.

It will of course be understood that, a fortiori, the primary optical element 24 produced can be made of silicone.

Claims (18)

1. Lighting device (10), in particular for a motor vehicle, comprising a first optical element (24), a second optical element (34) and a support (40), in which the first (24) and second (34) ) optical elements are arranged one behind the other along an optical axis A, characterized in that the first (24) and second (34) optical elements are fixed to the support (40) to form with it an optical assembly and in what the stand is in one piece. 2. Lighting device (10) according to the preceding claim wherein the first (24) and second (34) optical elements are fixed at a predetermined distance from each other along the optical axis "A" . 3. Lighting device (10) according to any one of claims in which the first (24) and second (34) optical elements are arranged parallel to each other. 4. Lighting device (10) according to any one of the preceding claims, in which at least one of the first (24) or second (34) optical elements on the one hand and the support (40) on the other hand are fixed together by overmolding. 5. Lighting device (10) according to the preceding claim wherein the optical element is removably attached to the support. 6. Lighting device (10) according to any one of the preceding claims in which the support (40) comprises at least one fixing means (442) designed to allow the fixing of one of the first (24) and second (34) optical elements to the support (40). 7. Lighting device (10) according to the preceding claim wherein the fixing means (442) is an elastic interlocking means made in one piece with the rest of the support (40). 8. Lighting device (10) according to one of claims 6 or 7 wherein the fixing means (442) is designed to maintain the first optical element (24) at a predetermined distance from the second optical element (34). 9. A lighting device (10) according to any one of the preceding claims in which at least one of the first (24) and second (34) optical elements is made of silicone. 10. Lighting device (10) according to any one of the preceding claims wherein at least one of the first (24) and second (34) optical elements is a lens. 11. Lighting device (10) according to any one of the preceding claims, characterized in that it further comprises at least one light emission means (12) and a projection optic (14) having an optical axis ( A), in which the assembly formed by the first (24) and second (34) optical elements and the support (40) is arranged between the light emitting means (12) and the projection optics (14) along the optical axis (A). 12. Lighting device (10) according to the preceding claim wherein the first (24) and second (34) optical elements are arranged one behind the other orthogonally to the optical axis (A). 13. Lighting device (10) according to any one of claims 11 to 12 wherein the at least one light emitting means (12) comprises light emitting diodes (18). 14. A lighting device (10) according to any one of claims 11 to 13 the first optical element (24) is designed to modify a distribution of the rays emitted by the at least one light emitting means (12). 15. Lighting device (10) according to any one of claims 11 to 14 wherein the first optical element (24) comprises at least one light guide (26). 16. Lighting device (10) according to any one of claims 11 to 14 wherein the first optical element (24) comprises a matrix of light guides (26). 17. A lighting device (10) according to any one of claims 11 to 16 wherein the second optical element (34) is a field correction lens designed to correct an aberration of field curvature of the projection optics (14). 18. Lighting device for a motor vehicle characterized in that it comprises an optical module (10) produced according to any one of the preceding claims.