Radiator for light-emitting module of motor vehicle, and light-emitting module for motor vehicle

Abstract

The invention relates to a heat sink (10) for a lighting module of a motor vehicle, comprising at least one protruding cooling element (100) extending in an extension direction between a foot (110) and a free end (111) and having a thickness (e) in a direction transverse to the extension direction, the thickness of the protruding cooling element decreases as it extends from the foot to the free end, characterized in that the protruding cooling element comprises a first portion (101) and a second portion (102), the first portion being located between the foot and the second portion and the second portion being located between the first portion and the free end, a decrease in the thickness of the protruding cooling element in the second portion is greater than a decrease in the first portion. The invention further relates to a light-emitting module comprising the radiator.

Description

Technical Field

[0001] The invention relates to the field of heat sinks for lighting modules for motor vehicles. The invention also relates to a lighting module for a motor vehicle comprising such a heat sink, and in particular to a motor vehicle lighting and / or signalling module. Background Art

[0002] Motor vehicle lighting modules, in particular lighting modules and / or signaling modules, comprise components such as light sources or elements for controlling light sources, which emit heat when activated. In order to ensure the performance of the lighting module, these components must be cooled. This is because overheating of these components, and in particular of the light sources, can deteriorate the shape of the light beam emitted by the lighting module.

[0003] It is known to use a heat sink to cool the light module. It is known that the heat sink comprises in particular a plurality of fins extending along a direction of extension between the foot and the free end and whose thickness, taken transversely to the direction of extension, decreases continuously from the foot towards the free end. This continuous decrease in the thickness of the fin from its foot towards its free end reflects a constant draft angle along each of the two lateral sides of the fin, the draft angle being defined for each of the two lateral sides of the fin by the angle formed between the respective lateral side of the fin and the direction of extension of the fin.

[0004] This draft angle typically has a value greater than or equal to 2°, which makes it possible to produce a reduction in the thickness of the fins, so that the heat sink can be easily injection molded and demoulded. However, such heat sinks have the disadvantage of being too bulky to be incorporated into certain lighting modules where the occupied space must be particularly limited.

[0005] It is possible to consider reducing the draft angle to an angle less than 2°, for example to an angle equal to 1°, while reducing the thickness of the foot of the fin and maintaining the spacing between two consecutive fins at its foot. The fins can then be brought closer together and more fins can be positioned in a smaller volume. The footprint of the heat sink is then reduced and, at the same time, the heat dissipation performance of the heat sink remains similar. However, this creates problems in the injection molding of the heat sink and in the demoulding of the heat sink.

[0006] This is because, due to the small thickness of the legs of the fins, and more generally the small thickness of the fins, it is difficult to ensure that the material forming the fins reaches the free ends of the fins during injection molding. As a result, the fins do not correctly adopt the shape of the mold used during the injection molding process and are therefore not always the desired shape. In addition, due to the small draft angle, demoulding of the heat sink is difficult and may cause wear problems of the heat sink or of the mold used during the injection molding process. Summary of the invention

[0007] The object of the present invention is to overcome at least one of the above-mentioned disadvantages of the prior art. More particularly, the object of the present invention is to propose a compact heat sink which makes it possible to dissipate the heat emitted by the components of a lighting module, in which the heat sink is intended to be mounted and which is easy to manufacture, in particular to injection mould and to demould. Another object of the present invention is to propose a lighting module comprising such a heat sink.

[0008] According to the first purpose, the present invention proposes a heat sink for a lighting module of a motor vehicle, the heat sink comprising at least one protruding cooling element, the at least one protruding cooling element extending between a support foot and a free end along an extension direction, and having a thickness along a direction transverse to the extension direction, the thickness of the protruding cooling element decreasing as it extends from the support foot to the free end.

[0009] The heat sink is noteworthy in that the protruding cooling element comprises a first portion and a second portion, the first portion is located between the support leg and the second portion, and the second portion is located between the first portion and the free end,

[0010] The thickness of the protruding cooling element decreases more in the second portion than in the first portion.

[0011] “The thickness of the protruding cooling element decreases more in the second part than in the first part” means that, considering that a section of the first part has a given height taken along the extension direction, and a section of the second part has a height the same as the given height of that section of the first part, each of the first section and the second section has a lower end facing the leg of the protruding cooling element and an upper end facing the free end of the protruding cooling element, then the difference between the thickness of the protruding cooling element at the lower end of the section of the first part and the thickness of the protruding cooling element at the upper end of the section of the first part is greater than the difference between the thickness of the protruding cooling element at the lower end of the section of the second part and the thickness of the protruding cooling element at the upper end of the section of the second part.

[0012] The reduction in thickness of the protruding cooling element from its foot to its free end is therefore not constant. As a result, it is possible to design a foot of the protruding element that is thick enough to ensure that the material forming the heat sink enters the mold during injection molding while maintaining a limited footprint. This is because, although the thickness of the foot of the protruding element is greater and therefore has a larger footprint than a heat sink with a constant draft angle (e.g., less than 2° all the way along the lateral sides of the protruding cooling element), the second portion has a greater reduction in thickness than the first portion, so that the thickness of the protruding cooling element can be sufficiently reduced as the protruding cooling element extends away from the foot.

[0013] According to a variant, the heat sink comprises a plurality of protruding cooling elements along the transverse direction.

[0014] Thanks to the invention, more protruding cooling elements can be positioned in the same footprint. In order to position more protruding cooling elements in the same footprint, the distance taken in the transverse direction between two consecutive protruding cooling elements at their feet is reduced. However, since the reduction in the thickness of the protruding cooling elements in the second portion is greater than in the first portion, the distance between two consecutive protruding cooling elements in the direction of their second portion is greater than the distance between the two consecutive protruding cooling elements in the direction of the first portion. In the direction of the second portion, and therefore closer to the free end of the protruding cooling elements, the distance between the two protruding cooling elements is therefore large enough to promote convection between the protruding cooling elements and therefore promote radiation towards the outside of the radiator. If the protruding cooling elements are too close together, this will hinder convection by pressure drop and eliminate radiation towards the outside, because the radiation will be captured inside the radiator between the protruding cooling elements. Thanks to the invention, the effectiveness of the radiator is maintained in a smaller footprint compared to the prior art.

[0015] According to a variant, the feet of two consecutive protruding cooling elements are spaced apart by the same distance in the transverse direction.

[0016] According to a variant, the protruding cooling elements are formed by fins or pins.

[0017] According to one variant, the protruding cooling element comprises a third portion between the second portion and the free end, the reduction in thickness of the protruding cooling element in the third portion being smaller than the reduction in thickness of the protruding cooling element in the second portion.

[0018] The second portion is then located between the first portion and the third portion.

[0019] For example, the reduction in thickness of the protruding cooling element in the third portion may be the same as the reduction in thickness of the protruding cooling element in the first portion.

[0020] According to a variant, the reduction in thickness of the protruding cooling element is constant in the first portion and in the second portion. Where appropriate, if the protruding cooling element comprises a third portion, the reduction in thickness of the protruding cooling element may also be constant in the third portion.

[0021] The mold for injection molding the protruding cooling element is then simpler to produce.

[0022] According to one variant, the protruding cooling element comprises a first lateral side and a second lateral side opposite the first lateral side.

[0023] For example, the first lateral side and the second lateral side correspond to edges of the protruding cooling element taken on a cross section of the protruding cooling element in a plane comprising the extension direction and the lateral direction.

[0024] Where appropriate, the first portion comprises a first main draft angle formed between a first lateral side of the protruding cooling element in the first portion and the extension direction, and the second portion comprises a second main draft angle formed between a first lateral side of the protruding cooling element in the second portion and the extension direction, and the first main draft angle is smaller than the second main draft angle. Where appropriate, if the protruding cooling element comprises a third portion, the third portion comprises a third main draft angle formed between a first lateral side of the protruding cooling element in the third portion and the extension direction, the third main draft angle being smaller than the second main draft angle and optionally the same as the first main draft angle.

[0025] According to a variant, the draft angle along a second lateral side of the protruding cooling element, opposite to the first lateral side, is constant. "Constant" means that it is the same for each of these portions.

[0026] Alternatively, the first lateral side is symmetrical to the second lateral side with respect to an axis of symmetry parallel to the direction of extension.

[0027] The draft angle along the second lateral side of the protruding cooling element then follows the same evolution as the draft angle along the first lateral side of the protruding cooling element. In particular, the first portion comprises a first draft angle formed between the second lateral side of the protruding cooling element in the first portion and the extension direction, and the second portion comprises a second draft angle formed between the second lateral side of the protruding cooling element in the second portion and the extension direction. In addition, the first main draft angle is identical to the first draft angle, and the second main draft angle is identical to the second draft angle. Where appropriate, if the protruding cooling element comprises a third portion, the third portion comprises a third draft angle formed between the second lateral side of the protruding cooling element in the third portion and the extension direction, and the third main draft angle is identical to the third draft angle.

[0028] According to one variant, the heat sink comprises at least one upper protruding cooling element and one lower protruding cooling element,

[0029] And the upper protruding cooling elements and the lower protruding cooling elements are aligned and extend in opposite directions in the same extension direction.

[0030] In particular, each of the upper protruding cooling element and the lower protruding cooling element comprises a foot and a free end, and the feet of each of the upper protruding cooling element and the lower protruding cooling element rest on opposite sides along the extension direction of the base plate of the heat sink. Therefore, the upper protruding cooling element and the lower protruding cooling element extend on both sides of the base plate.

[0031] Where appropriate, the upper protruding cooling elements and the lower protruding cooling elements each have a height taken along the extension direction. According to a first variant, the height of the upper protruding cooling elements is equal to the height of the lower protruding cooling elements. According to a second variant, the height of the upper protruding cooling elements is different from the height of the lower protruding cooling elements.

[0032] Thus, the height of the protruding cooling element is adapted to the available space in the lighting module in combination with the heat sink.

[0033] According to a variant, the heat sink comprises a parting surface extending in a longitudinal plane perpendicular to the extension direction.

[0034] The parting surface corresponds to the joining area of ​​the two parts of the mould. In particular, the upper fin and the lower fin extend on both sides of the parting surface. Preferably, the base plate of the heat sink is located in the parting surface.

[0035] According to a second object, the invention proposes a lighting module for a motor vehicle, comprising a heat sink according to the first object of the invention.

[0036] According to one variant, the lighting module comprises:

[0037] - at least one light source configured to emit a light beam;

[0038] - at least one printed circuit board, the light source being arranged on the at least one printed circuit board;

[0039] - at least one optical element configured to deflect and / or project a light beam emitted by the light source;

[0040] And the heat sink is configured to cool the at least one light source.

[0041] According to a variant, the printed circuit board is arranged on a heat sink.The heat sink is thus in indirect contact with the light source(s), which allows efficient cooling of the light sources.

[0042] According to one variant, the parting plane of the heat sink is parallel to the printed circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Other characteristics and advantages of the invention will become more clearly apparent on reading the following description given by way of illustrative and non-limiting examples and through the accompanying drawings, in which:

[0044] [ Figure 1 ] Figure 1 A heat sink including a plurality of fins according to the first object of the present invention is shown;

[0045] [ Figure 2 ] Figure 2 Shows Figure 1 A rear cutaway view of the radiator is shown;

[0046] [ Figure 3 ] Figure 3 Schematically shows Figure 1 and Figure 2 The fins of the radiator;

[0047] [ Figure 4 ] Figure 4 Schematically shows an alternative solution for the fins of a heat sink according to a variant of the first object of the invention;

[0048] [ Figure 5 ] Figure 5 A lighting module for a motor vehicle according to the second object of the present invention is shown, the lighting module comprising: Figures 1 to 3 Radiators, reflectors and projection lenses as described in;

[0049] [ Figure 6 ] Figure 6 Shows Figure 5 A light emitting module in which the reflector has been removed to expose the printed circuit board and the light source. DETAILED DESCRIPTION

[0050] In the following description, the longitudinal direction L indicates the direction in which the vehicle travels (oriented from the rear to the front), the transverse direction T indicates the direction extending transversely to the vehicle and perpendicular to the longitudinal direction L, and the vertical direction V indicates the direction extending from the bottom to the top of the vehicle and perpendicular to the longitudinal direction L and the transverse direction T. These directions are represented by trihedrons L, V, T in the drawings.

[0051] Figure 1 A heat sink 10 for a lighting module of a motor vehicle is shown. As will be seen below, the heat sink 10 is intended to be mounted in a lighting module 20 and, in turn, in a motor vehicle. In the following description, the longitudinal orientation L, the transverse orientation T and the vertical orientation V given with reference to the heat sink 10 and the lighting module 20 correspond to the orientation of the heat sink 10 and the lighting module 20 when mounted on a vehicle.

[0052] The heat sink 10 comprises a plurality of protruding cooling elements. In the illustrated example, the protruding cooling elements are formed by fins 100. It will be appreciated that other protruding cooling elements, such as pins, may be used. In the following description, the term "fin" will be used to refer to the protruding cooling elements of the heat sink 100.

[0053] The heat sink 10 includes a base plate 11 from which fins 100 extend. In particular, each fin 100 extends in an extension direction E ( Figure 2 The fin 100 extends between a foot 110 and a free end 111, the foot 110 of the fin being positioned towards the base plate 11 of the heat sink 10. In the example shown, the extension direction E of the fin 100 corresponds to the vertical direction V.

[0054] The heat sink 10 comprises a parting plane P extending in a longitudinal plane perpendicular to the extension direction E. The parting plane P corresponds to the plane where two parts of a mould used during injection moulding of the heat sink 10 meet. Preferably, the base plate 11 of the heat sink 11 is located in the parting plane P.

[0055] The fins 100 of the heat sink 10 include an upper fin 100a and a lower fin 100b. The legs 110 of each of the upper fin 100a and the lower fin 100b rest on opposite sides along the extension direction E of the base plate 11 of the heat sink 10. The upper fin 100a and the lower fin 100b thus extend on both sides of the base plate 11 of the heat sink 10.

[0056] In particular, the upper fin 100a extends upward along the vertical direction V from the foot 110 on the upper surface of its base plate 11 to its free end 111, and the lower fin 100b extends downward along the vertical direction V from the foot 110 on the lower surface of its base plate 11 (opposite to the upper surface of the base plate 11 along the extension direction E) to its free end 111.

[0057] The upper fins 100a and the lower fins 100b are aligned. In other words, each upper fin 100a extends along the same extension direction E as the lower fins 100b and extends oppositely away from the lower fins. According to a variant covered by the invention but not shown, the upper fins 100a may not be aligned with the lower fins 100b, and conversely, the lower fins 100b may not be aligned with the upper fins 100a.

[0058] In a variant not shown, the heat sink 10 may include only the upper fins 100 a or only the lower fins 100 b .

[0059] Each fin 100 comprises a height in the extension direction E. The height of the fin 100 depends on the available space in the light emitting module in which the heat sink 10 is to be mounted. The upper fins 100a and / or the lower fins 100b may therefore all have the same height ha. Alternatively, the upper fins 100a and / or the lower fins 100b may have different heights ha. Figure 1 and Figure 2 In the non-limiting example shown, several upper fins 100a have the same height ha, while other upper fins 100a have different heights ha, and all lower fins 100b have the same height hb, it being understood that some lower fins may also have different heights hb.

[0060] The fins 100 , and therefore the upper fins 100 a and the lower fins 100 b , are distributed along a direction transverse to the extension direction E. In the example illustrated, the direction transverse to the extension direction E corresponds to the transverse direction T.

[0061] Figure 2 A rear sectional view is shown in a plane defined by the extension direction and the transverse direction of the heat sink 10 , which in this example correspond to the vertical direction and the transverse direction, respectively.

[0062] Each fin 100 has a thickness e in the transverse direction. This thickness e is Figure 2 This thickness e decreases from the foot 110 of the fin 100 to the free end 111 of the fin 100 . In particular, the thickness e of each fin 100 is greater near the foot 110 of the fin 100 than near the free end 111 of the fin 100 .

[0063] The fin 100 comprises a first portion 101 and a second portion 102. In the example shown, the fin 100 further comprises a third portion 103. The first portion 101 is located between the leg 110 and the second portion 102, the second portion 102 is located between the first portion 101 and the third portion 103, and the third portion 103 is located between the second portion 102 and the free end 111. In each of these portions 101, 102, 103, the variation of the thickness e of the fin is different.

[0064] The thickness e of each fin 100 decreases more in the second portion 102 than in the first portion 101. The thickness e of the fin 100 decreases less in the third portion 103 than in the second portion 102. In the illustrated example, the thickness e of the fin 100 decreases in the third portion 103 by the same amount as the thickness e of the fin 100 decreases in the first portion 101.

[0065] To illustrate these changes in the thickness e of the fin 100, Figure 3 Schematically shown in FIG are fins 100 of a heat sink 10. A first section P1 of a first portion 101, a second section P2 of a second portion 102, and a third section P3 of a third portion 103 can be considered on each fin 100, each of these first sections P1, second sections P2, and third sections P3 having the same height H taken along the extension direction E of the fin 100. Each of the first sections P1, second sections P2, and third sections P3 is defined by an upper end P1sup, P2sup, P3sup facing the free end 111 of the fin 100 and a lower end P1inf, P2inf, P3inf facing the leg 110 of the fin 100. Each upper end P1sup, P2sup, P3sup comprises a thickness e1h, e2h, e3h taken in the transverse direction, and each lower end P1inf, P2inf, P3inf comprises a thickness e1b, e2b, e3b taken in the transverse direction.

[0066] Since the thickness e of each fin 100 is reduced more in the second portion 102 than in the first portion 101, the difference between the thickness e1b of the fin 100 at the lower end P1inf of the first section P1 and the thickness e1h of the fin 100 at the upper end P1sup of the first section P1 is greater than the difference between the thickness e2b of the fin 100 at the lower end P2inf of the second section P2 and the thickness e2h of the fin 100 at the upper end P2sup of the second section P2.

[0067] Since the reduction in the thickness e of the fin 100 in the third portion 103 is smaller than the reduction in the thickness e of the fin 100 in the second portion 102, the difference between the thickness e2b of the fin 100 at the lower end P2inf of the second section P2 and the thickness e2h of the fin 100 at the upper end P2sup of the second section P2 is smaller than the difference between the thickness e3b of the fin 100 at the lower end P3inf of the third section P3 and the thickness e3h of the fin 100 at the upper end P3sup of the third section P3.

[0068] In addition, in particular, in the example shown, since the reduction in the thickness e of the fin 100 in the third portion 103 is the same as the reduction in the thickness e of the fin 100 in the first portion 101, the difference between the thickness e1b of the fin 100 at the lower end P1inf of the first section P1 and the thickness e1h of the fin 100 at the upper end P1sup of the first section P1 is equal to the difference between the thickness e3b of the fin 100 at the lower end P3inf of the third section P3 and the thickness e3h of the fin 100 at the upper end P3sup of the third section P3.

[0069] The reduction in the thickness e of the fin 100 from its foot 110 towards its free end 110 is therefore not constant, which makes it possible to have a sufficiently wide foot 110 to ensure that the material forming the heat sink 10 enters the mold during injection molding, while reducing the thickness of the fin 100 to a greater extent in the second portion 102, so as to obtain a thinner fin 100 more quickly as the fin 100 extends towards the free end 111 of the fin. Since the fins 100 thin more quickly due to the greater reduction in thickness in the second portion 102, the fins 100 can be positioned closer to each other at their foot 110, since the distance between the fins 100 eventually increases more quickly in the second portion 102. Even if the fins 100 will likely radiate heat towards each other in the direction of the first portion 101, this radiation phenomenon will therefore also be limited in the direction of the second portion 102 and the third portion 103. In the direction of the second portion 102 and the third portion 103, convection is promoted and radiation towards the outside of the heat sink is also promoted.

[0070] For each of the first portion 101, the second portion 102 and the third portion 103, the reduction in thickness e of the fin 100 is constant. For the first portion, the difference between the thickness e1b of the fin 100 at the lower end P1inf of the first portion P1 and the thickness e1h of the fin 100 at the upper end P1sup of the first portion P1 is the same, regardless of which first segment P1 of height H is considered. Similarly, for the second portion 102, the difference between the thickness e2b of the fin 100 at the lower end P2inf of the second segment P2 and the thickness e2h of the fin 100 at the upper end P2sup of the second segment P2 is the same, regardless of which second segment P2 of height H is considered. Similarly, for the third portion 103, the difference between the thickness e3b of the fin 100 at the lower end P3inf of the third segment P3 and the thickness e3h of the fin 100 at the upper end P3sup of the third segment P3 is the same, regardless of which third segment P3 of height H is considered.

[0071] Each fin 100 comprises a first transverse side 120 and a second transverse side 130 opposite to the first transverse side 120. In particular, the first transverse side and the second transverse side correspond to the edges of the fin 100 taken on a cross section of the fin 100 in a plane comprising the extension direction E and the transverse direction T, the plane corresponding to Figure 2 The cross-sectional plane in Figure 3 The plane of the fin 100 is schematically shown in FIG.

[0072] The first lateral side 120 is symmetrical to the second lateral side 130 with respect to an axis of symmetry S parallel to the extension direction.

[0073] Since the thickness e of the fin 100 is constantly reduced in each of the first portion 101, the second portion 102, and the third portion 103, the first lateral side 120 and the second lateral side 130 are formed by straight line segments for each of the first portion 101, the second portion 102, and the third portion 103. The first portion 101 thus includes a first main draft angle i1 formed between the first lateral side 120 of the fin 100 in the first portion 101 and the extension direction E, the second portion 102 includes a second main draft angle i2 formed between the first lateral side 120 of the fin 100 in the second portion 102 and the extension direction E, and the third portion 103 includes a third main draft angle i3 formed between the first lateral side 120 of the fin 100 in the third portion 103 and the extension direction E.

[0074] The first main draft angle i1 is smaller than the second main draft angle i2 , and the third main draft angle i3 is smaller than the second main draft angle i2 , and in particular, in the illustrated example, the third main draft angle i3 is the same as the first main draft angle i1 .

[0075] By symmetry, the draft angle along the second lateral side 130 of each fin 100 follows the same evolution as the draft angle along the first lateral side 120 of the fin. In particular, the first portion 101 comprises a first draft angle i1' formed between the second lateral side 130 of the fin 100 in the first portion 101 and the extension direction E, the second portion 102 comprises a second draft angle i2' formed between the second lateral side 130 of the fin 100 in the second portion 102 and the extension direction E, and the third portion 103 comprises a third draft angle i3' formed between the second lateral side 130 of the fin in the third portion 103 and the extension direction E.

[0076] The first main draft angle i1 is the same as the first draft angle i1 ′, the second main draft angle i2 is the same as the second draft angle i2 ′, and the third main draft angle i3 is the same as the third draft angle i3 ′.

[0077] Figure 4 Alternative shapes of the fins 100 of the heat sink 10 are schematically shown. Figure 4 The fin 100 shown in FIG. 1 differs from the fins shown in the other figures only in that the reduction in thickness e of the fin 100 in the first portion 101 and in the second portion 102 is not constant. In the example shown, the reduction in thickness e of the fin 100 is constant in the third portion 103.

[0078] In the following description, only the non-constant reduction of the thickness e in the first portion 101 and the second portion 102 will be explained, it being understood that in all other respects, reference is made to Figures 1 to 3 The description given for the fin 100, and in particular for the third portion 103, applies to Figure 4 The fins in 100.

[0079] Since the reduction in the thickness e of the fin 100 is not constant, for the first portion 101, the difference between the thickness e1b of the fin 100 at the lower end P1inf of the first section P1 and the thickness e1h of the fin 100 at the upper end P1sup of the first section P1 is different depending on which first section P1 is considered. Similarly, for the second portion 102, the difference between the thickness e2b of the fin 100 at the lower end P2inf of the second section P2 and the thickness e2h of the fin 100 at the upper end P2sup of the second section P2 is different depending on which second section P2 is considered.

[0080] Due to the non-constant reduction of the thickness e of the fin 100 in the first portion 101 and in the second portion 102 , the first lateral side 120 and the second lateral side 130 are formed by a continuous curve for the first portion and the second portion.

[0081] The first portion 101 includes a first main draft angle i1 formed between a tangent line of the first lateral side 120 of the fin 100 in the first portion 101 and the extension direction E, and the second portion 102 includes a second main draft angle i2 formed between a tangent line of the first lateral side 120 of the fin 100 in the second portion 102 and the extension direction E. The first main draft angle i1 and the second main draft angle i2 gradually change along the first lateral side 120. In particular, the first main draft angle i1 and the second main draft angle i2 increase as the tangent line of the first lateral side 120 under consideration extends away from the base plate 11 of the heat sink 10.

[0082] The third main draft angle i3 is smaller than the second main draft angle i2. In particular, the second portion 102 may be defined by a portion in which all second main draft angles i2 are smaller than the third main draft angle i3. In this case, the portion between the second portion 102 defined in this manner and the leg 110 of the fin 100 forms the first portion 101.

[0083] By symmetry, the draft angle along the second lateral side 130 of each fin 100 follows the same evolution as the draft angle along the first lateral side 120 of the fin.

[0084] Figure 5 and Figure 6 A light module 20 for a motor vehicle is shown, mounted on a radiator 10. This light module 20 is intended to be mounted in a motor vehicle headlamp.

[0085] The light emitting module 20 includes a plurality of light sources 201 configured to emit light beams and a printed circuit board 202 on which the light sources 201 are arranged. The heat sink 10 allows cooling of the light sources 201. The printed circuit board 202 rests on the heat sink 10. In this example, the parting plane P of the heat sink 10 is parallel to the printed circuit board 202.

[0086] The lighting module 20 comprises a first optical element in the form of a reflector 203 and a second optical element in the form of a projection lens 204. The reflector 203 is intended to receive the light beam emitted by the light source 201 and reflect the light beam towards the projection lens 204. The projection lens 204 makes it possible to project the light beam reflected by the reflector 203 onto the road on which the vehicle is travelling.

Claims

1. A heat sink (10) for a lighting module of a motor vehicle, the heat sink comprising at least one protruding cooling element (100), the at least one protruding cooling element extending along an extension direction between a leg (110) and a free end (111), and having a thickness (e) along a direction transverse to the extension direction, the thickness of the protruding cooling element decreasing as it extends from the leg to the free end, It is characterized in that The protruding cooling element comprises a first portion (101) and a second portion (102), the first portion being located between the foot and the second portion, and the second portion being located between the first portion and the free end, The thickness of the protruding cooling element is reduced more in the second portion than in the first portion.

2. Heat sink according to the preceding claim, comprising a plurality of protruding cooling elements (100) along said transverse direction.

3. The radiator according to claim 1 or 2, wherein: The protruding cooling elements are formed by fins (100) or pins.

4. The heat sink according to any one of claims 1 to 3, wherein: The protruding cooling element comprises a third portion (103) located between the second portion and the free end, the thickness of the protruding cooling element decreasing in the third portion less than the thickness of the protruding cooling element decreasing in the second portion.

5. The heat sink according to any one of claims 1 to 4, wherein: The reduction in thickness of the protruding cooling element is constant in the first portion (101) and in the second portion (102).

6. A heat sink as claimed in any preceding claim, wherein: The protruding cooling element comprises a first lateral side (120) and a second lateral side (130) opposite the first lateral side, the first lateral side being symmetrical to the second lateral side with respect to an axis of symmetry (S) parallel to the extension direction.

7. The heat sink as claimed in one of the preceding claims, comprising at least one upper protruding cooling element (100a) and one lower protruding cooling element (100b), And among them, The upper protruding cooling elements and the lower protruding cooling elements are aligned and extend in opposite directions in the same extension direction.

8. Radiator according to one of the preceding claims, comprising a parting plane (P) extending in a longitudinal plane perpendicular to said extension direction.

9. A lighting module (20) for a motor vehicle, comprising a heat sink (10) according to one of the preceding claims.

10. The lighting module (20) according to the preceding claim, further comprising: - at least one light source (201) configured to emit a light beam; - at least one printed circuit board (202), the light source being arranged on the at least one printed circuit board; - at least one optical element (203, 204) configured to deflect and / or project a light beam emitted by the light source; And wherein the heat sink is configured to cool the at least one light source.

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