• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    The present invention relates to a cooling member (1) for a lighting and / or signaling system for a motor vehicle, the member (1) comprising a base (10) (10) having two opposite flat faces, at least one of which is configured to support a light source (2) of said system and at least one heat dissipating device (100) in thermal conduction connection to said base (10), the dissipator device (100) including a plurality of dissipating elements (101) ), characterized in that each dissipator element (101) of said plurality comprises at least one dissipating wall (102) extending from a fixing face (11) taken from one of said faces of the base (10) and in a plane inclined with respect to the plane of the fixing face (11), at least some of the dissipating walls (102) of a dissipating element (101) extending respectively by a fixing portion (107) through which the dissipating element (101) is attached and fixed on said fixing face (11), the fixing portion (107) being formed integrally with the corresponding dissipating wall (102) and extending mainly in the plane of said fixing face (11), the dissipator element (101) having a discontinuity of material between the attachment portion (107) of a first dissipating wall (102) and a second dissipating wall (102) adjacent to the first dissipating wall. The invention also relates to a lighting and / or signaling system and a method for producing the cooling member.
    公开号:FR3025293A1
    申请号:FR1458137
    申请日:2014-08-29
    公开日:2016-03-04
    发明作者:Marc Duarte；Eric Stefura；Paul Jacquemin；Christophe Cleto；Lotfi Redjem-Saad；Brahim Elhachir
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The invention relates to the field of lighting and / or signaling systems for a motor vehicle. It relates more particularly, a cooling member for such a system. It finds for particularly advantageous but non-limiting application the field of projectors for vehicles. STATE OF THE ART Automotive headlamps are usually composed of a housing which is closed by a transparent wall through which emerge one or more light beams. This housing houses at least one optical module, mainly comprising a light source and an optical system capable of modifying at least one parameter of the light generated by the light source for the emission of the light beam by the optical module. The evolution of techniques tends to favor the use of light sources consisting of at least one LED (Electroluminescent Diode), because of their low power consumption, their small size and the quality of the lighting obtained. However, LEDs have the disadvantage that in use they produce heat which is detrimental to their operation. Indeed, the more an LED rises in temperature, the more its luminous flux decreases. When the optical module is designed to generate a beam requiring a high light intensity, such as for low beam, high beam or fog lamps. The number of LEDs and / or the power required for their operation is high. As an indication, such high operating power is likely to be between 5 W and 60 W. To provide efficient cooling within the housing above an operating power of 10 Watts (10 W ), it is known from the document W02005116520 to induce a forced passage of an air flow along the fins, according to the orientation of the general direction of emergence of the light out of the optical module. The operation of such an air flow forced passage has the disadvantage of having to implement specific means to cause the flow of air and increase the size inside the projector. The cost and complexity of the projector are also high. It has also been proposed to arrange a heat sink in the form of fins or a molded plate in contact with the LED. The documents FR2840151 or FR2853200 present this type of plate. These solutions have the disadvantage of having a limited efficiency to evacuate the calories. Thus, in spite of the existing solutions, there still exists a need to provide a solution for more efficiently cooling a lighting and / or signaling system while maintaining limited size and complexity. SUMMARY OF THE INVENTION In order to achieve this objective, one aspect of the present invention relates to a cooling member for a lighting and / or signaling system for a motor vehicle, the member comprising a base having two opposing flat faces of which at least one is configured to support a light source of said system and at least one heat dissipating device in thermal conduction connection to said base, the dissipator device including a plurality of dissipating elements. The dissipating element comprises at least one dissipating wall extending from a fixing face taken from one of said faces of the base and in a plane inclined with respect to the plane of the fixing face, the dissipating wall or at least some dissipating walls of the dissipating element respectively extending through a fixing portion by which the dissipating element is attached and fixed on said fixing face, the fixing portion being formed integrally with the corresponding dissipating wall.
    [0002] The invention thus makes it possible to separately form the base and the dissipator device. The base can then be manufactured by a process typically injection molding, stamping, stamping, or even machining. This makes it easy to obtain a large mass to promote the extraction of calories from the LED and their absorption within the base. The dissipator device can in turn be made by a method, typically cutting and folding a metal sheet, facilitating the production of a profile having a high ratio of exchange surface with air on mass. This helps promote heat dissipation in the air by convection.
    [0003] The materials and manufacturing methods for the base and the dissipator device can therefore be chosen freely and independently. It is thus possible to choose materials having a lower quality of heat exchange but significantly less expensive. Moreover, the fixing portions make it possible to improve the transfer of the calories from the base to the dissipator device, without impairing the free flow of air along the dissipating walls. In addition, the dissipating walls extending from the fixing face or from the face opposite to the latter, which increases the evacuation of calories from the base to the dissipative walls.
    [0004] Furthermore, the invention offers the possibility of arranging the wings cantilever while maintaining a good contact surface for conduction and resistance. The cantilever allows the circulation of air along the fins. The connection of the LED, by wire bonding, implies that the LED is in direct contact with the base, eg glued. As a result, the propagation of thermal energy from the source to the dissipators is shorter and therefore more efficient. Optionally, the invention may further include at least any of the following optional features taken separately or in combination. The fixing portion is integrally formed with the dissipating wall and extending mainly in the plane of said fixing face; This makes it possible to increase the contact surface between this dissipating wall and the base, thus favoring heat transfer towards the dissipating wall. the fixing portion and the corresponding dissipating wall are formed by a folded sheet, a fold of this sheet separating the fixing portion and the corresponding dissipating wall. According to one embodiment, the fixing portion and the dissipating wall are at a 90 ° angle at the fold. - The dissipating element has a discontinuity of material between the fixing portion of a first dissipating wall and a second dissipating wall adjacent to the first dissipating wall. Each dissipating wall of each dissipating element is extended by a fixing portion through which the dissipating element is attached and fixed on the base, the fixing portion being integrally formed with the dissipating wall. The attachment portion extends perpendicularly to said dissipating wall which it extends so as to form a fin. - The dissipating element is fixed to the base only by the fixing portion. - The dissipative walls form fins. - The dissipator element is attached to the base. The dissipating wall extends mainly in a plane defined by a direction perpendicular to the plane of the face of the base from which the dissipating wall extends and a direction parallel to the plane of said face. - The member comprises at least a separate fixing portion per dissipative wall. The dissipative wall extends in particular in a main extension direction which is parallel to the plane of the fixing face. A proximal portion of the dissipating wall is disposed in line with the fixing face and a distal portion of the dissipating wall is disposed cantilever with respect to the fixing face. The cantilevered distal portion, taken along said major extension direction, has a length of at least 0.5 and preferably at least 0.75 the total length of the dissipative wall taken along the same principal extension direction. .
    [0005] Thus, the dissipating element is largely remote from the base, which favors the dissipation in the air of the heat transmitted from the base to the dissipating element. - Each dissipator element is formed by folding. Typically it is formed from a folded sheet or strip. The folding of a dissipating element forms an air circulation channel delimited by two dissipative walls. The channel is open at two of its ends in a direction perpendicular to the face of the base on which the dissipator device 10 is attached. In one embodiment, it is open in the main extension direction of the dissipating wall. In another embodiment it is closed in the main extension direction. It then forms, for example, alveoli. The dissipator forms a honeycomb structure, each channel forming a cell. - The dissipating elements are connected to each other. - The dissipating elements are formed integrally formed material, two adjacent dissipating walls having a continuity of material. - The dissipator device is formed by folding the same room. Preferably, the workpiece is continuously folded along a set of adjacent air convection channels. The folding forms for example accordion. - Each dissipator element is formed by folding from a separate room, the dissipating elements being individually reported on the base. each dissipating element is constituted by a separate folded sheet, the dissipating elements being distinct from the base and fixed on the latter, in particular by glue or by welding. They can be reported successively or preferably in bulk on the basis. The combination of individual dissipating elements, preferably two individual elements, forms a channel. According to one embodiment, the fixing portion of the first dissipating wall is brought into contact with one of: the second dissipating wall adjacent to the first dissipating wall or a fixing portion of the second dissipating wall. Alternatively, the fixing portion of the first dissipating wall is related to a distance less than the distance D of one of: the second dissipating wall adjacent to the first dissipating wall or the securing portion of the second wall; distance D being less than or equal to half the distance separating the first and second dissipative walls at the level of the fixing portions. Preferably, the distance D being less than or equal to one quarter of the distance separating the first and second dissipating walls at the level of the fixing portions. The distance D is measured in a direction parallel to the plane of the fixing face and in a direction perpendicular to a main direction along which the dissipating walls extend. The distance D is measured at the proximal ends of two consecutive dissipative walls. The thickness of the dissipating walls of the dissipating element is between 0.4 and 1 millimeter; the thickness of the base is between 2 and 6 millimeters; the distance between two adjacent dissipating walls is between 4 and 12 millimeters. The base is taken from one of the following materials or an alloy based on one of the following materials: Aluminum 1050 or 1060; - The dissipating elements are taken from one of the following materials or an alloy based on one of the following materials: aluminum 1050 or 1060; - The dissipator device comprises at least one connecting element attached to at least a plurality of and preferably all the dissipating walls 25 and linking together the dissipating walls of said plurality. - The connecting element forms a bar fixed by welding or brazing on the dissipative walls of said plurality. - The connecting element forms a comb nested on the dissipative walls of said plurality. The base is a molded or extruded material. According to a preferred embodiment, the base is molded and the fins consist of 3025293 7 stamped plates. The stamped plates can be a 90% Alu alloy, which makes it possible to have an improved thermal conduction. The dissipator device comprises at least one hook integral with a fixing portion and configured to cooperate with an opening made in an adjacent fixing portion. a fixing portion carries a male part configured to cooperate by interlocking with a female part carried by an adjacent fixing portion, the cooperation between the male and female parts preventing the removal of the adjacent fixing portions in certain relative movements of the portions of adjacent fasteners. According to one embodiment, the channels are formed by fins joined in pairs so as to form a "U". According to one embodiment, the ends of the branches of the "U" resting partly on the base.
    [0006] According to another aspect, the present invention relates to a lighting and / or signaling system for a motor vehicle comprising a cooling member according to the invention and an optical device configured to modify the direction of the light radiation emitted by the source.
    [0007] According to one embodiment, the system comprises a light source supported by one of said opposite faces of said base. According to one embodiment, the optical device of the lighting and / or signaling system comprises optical components which consist, for example, of a reflector, a lens, a scattering element or a collimator, or any other organ capable of modifying at least one of the parameters of the light generated by the light source, such as its mean reflection and / or its direction.
    [0008] According to another aspect, the present invention relates to a method for producing a cooling member according to the invention comprising in particular the following steps: - to make the base; - Realize the dissipator device by performing at least the following steps: o Cut a sheet to form at least a portion for forming a dissipating wall of a dissipator element and at least a portion for forming a fixing portion extending said wall ; o bending of the sheet so that the fixing portion is disposed in a plane inclined relative to the plane of said dissipating wall; 10 - postpone the dissipating element by fixing the fixing portion on one face of the base. This method can be used to obtain a cooling member according to the invention. Optionally, the invention, including the method previously described, may further have at least any of the following optional features taken separately or in combination. the base is obtained by molding, injection molding, extrusion, stamping or machining. the fastening portion is fixed on one face of the base by a thermal interface, for example glue: according to one embodiment, a plurality of at least dissipating elements, and preferably all the elements; dissipators, have between them a continuity of material and are formed from the same sheet. the said plurality of dissipating elements is reported as a block on the base. Preferably, each dissipating element comprises two parallel dissipating walls. Preferably each dissipating element comprises two parallel dissipating walls. According to one embodiment each dissipating element comprises two parallel dissipating walls folded one parallel to the other so as to form an open channel. According to another embodiment, at least a plurality of dissipating elements, and preferably all the dissipating elements, are individually formed before being attached to the face of the base. Preferably, the dissipating elements are reported in block on the face of the base. Preferably each dissipating element comprises two parallel dissipating walls.
    [0009] BRIEF DESCRIPTION OF THE FIGURES The objects, objects, as well as the features and advantages of the invention will become more apparent from the detailed description of an embodiment thereof which is illustrated by the following accompanying drawings in which: Figure 1 shows an exemplary embodiment of the invention, wherein the cooling member is associated with a card comprising a printed circuit (PCB). - Figure 2 shows another embodiment wherein the cooling member has two dissipating elements associated with the same base. FIGS. 3a to 3e illustrate several variants of the principle illustrated in FIGS. 1 and 2. FIG. 4a illustrates in detail an example of a dissipator device. - Figures 4b to 4h illustrate several steps leading to obtaining the dissipator device of Figure 4a. - Figures 5a to 5c illustrate an embodiment in which the dissipating device forms alveolar channels. FIGS. 6a and 6b illustrate in detail a dissipator element of the dissipator device illustrated in FIGS. 5a to 5c. FIGS. 10b and 10b illustrate several solutions making it possible to reinforce the fixing of the dissipating elements forming together the dissipating device. The drawings are given by way of example and are not limiting of the invention. They constitute schematic representations of principle intended to facilitate the understanding of the invention and are not necessarily at the scale of practical applications.
    [0010] In particular, the relative dimensions of the different elements are not necessarily representative of reality. DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the invention will now be described with reference to FIGS. 1 and 2. The lighting and / or signaling system comprises one or more light sources 2. Preferably, it This is LEDs. There are three of them in this nonlimiting embodiment.
    [0011] The LEDs 2 are electrically connected to an electronic circuit, for example in the form of a printed circuit forming a rigid or flexible PCB (printed circuit board). The LEDs 2 are supported by a base 10. In a preferred but nonlimiting manner, the LEDs 2 are directly in contact with the base 10.
    [0012] The base 10 thus forms a support for the LEDs 2. The base 10 is also part of a cooling member 1 for the lighting and / or signaling system. For this purpose, the base 10 is in heat conduction connection with the LED 2. It absorbs the heat produced by the LED 2 to cool the latter.
    [0013] The cooling member 1 also comprises a heat sink device 100. The dissipator device 100 is in thermal conduction connection with the base 10. It also has a plurality of dissipating walls 102 arranged in contact with the air and whose function is to dissipate by convection the calories transmitted from the base 10 to the device heat sink 100. Thus, the heat generated by the LED 2 is extracted from the latter and transmitted by the base 10 by conduction. At least a portion of the heat absorbed by the base 10 is then transmitted, mainly by conduction, to the dissipating device 100 which then dissipates it by convection in the surrounding medium, typically air. The base 10 comprises at least one portion which has two opposite and substantially planar faces. This base portion can thus be qualified as sole in the illustrated example. According to other embodiments, the base 10 has additional portions to the sole. These two faces are contained in parallel planes illustrated in FIG. 1. One of the substantially planar faces is configured to receive and support the LED 2. Advantageously, at least one of these two faces is configured to cooperate with the dissipating device 100 to ensure the fixing of the latter to the base 10. This face is subsequently designated fixing face 11. In the example illustrated in Figure 1, the upper face, the one 10 supporting the LEDs 2, acts as a fixing face 11 for the dissipating device 100 illustrated. The dissipator device 100 has a plurality of dissipating elements 101 each carrying two dissipating walls 102. These dissipating elements 101 are preferably arranged parallel to one another. The dissipating walls 102 extend from the base 10 and in a plane inclined with respect to the xy plane of the faces of the base 10 and in particular of the fixing face 11. As illustrated, they can extend in a plane perpendicular to that of the faces of the base 10, that is to say according to the plane zx. Particularly advantageously, the dissipating elements 101 extend in the x direction by having a cantilever relative to the base 10. These dissipating elements 101 are fixed to the base 10 on a portion of their dimension according to the X-axis which does not exceed 0.5 and preferably does not exceed 20% of the total dimension of the dissipating element 101 in this direction x. This makes it possible to increase the exchange surface between the dissipator element 101 and the surrounding air so as to optimize the convective heat dissipation. Particularly advantageously, the dissipating elements 101 have attachment portions 107 configured to ensure dual functionality: - the attachment of the dissipating element 101 to the base 10; the transfer by conduction of the calories from the base 10 to the dissipating element 101.
    [0014] These fixing portions 107 are adjacent to the dissipating walls 102. While the dissipating walls 102 are contained in a plane different from that of the fixing face 11 (xy plane), preferably perpendicular (zx plane), the portions of fixing 107 are contained in a plane parallel (xy) to that 5 of the fixing face 11. This allows to provide a large contact surface between the base 10 and the attachment portions 107 to increase the resistance of the dissipating elements 101 and increase the transfer of calories from the base 10 to the dissipating device 100. Particularly advantageously, each attachment portion 107 10 extends one of the dissipating walls 102. They form a single piece, preferably formed integrally. Advantageously, the dissipating wall 102 and the fixing portion 107 are obtained from the same sheet or the same strip and are folded to be arranged in two different planes.
    [0015] They then have a junction 116, illustrated in FIGS. 4c and 4e, for example. This junction 116 and this continuity of material improve the transfer of the calories between the fixing portion 107 in contact with the base 10 and the dissipating walls 102. Thus, and particularly advantageously, the dissipating device 100 is attached to the base 1 and Thus, the invention offers a great freedom of choice both in the materials and in the manufacturing processes for each of the base 10 and the dissipating element 101. For example, will make the base 10 by molding or by injection molding ("die casting" in English) or by stamping or stamping ("stamping" in English). This makes it possible to obtain in a simple and inexpensive manner a base 10 having a high thermal density in order to offer a great ability to extract the heat out of the LED 2 and to store it inside the base 10. If the base 10 is formed by molding, for example an aluminum-based alloy, for example an alloy of aluminum and silicon, with a mass content of about 11%. This facilitates the proper filling of the mold. If the base 10 is formed by stamping, then aluminum or an aluminum alloy having a higher proportion of aluminum (typically greater than 90%) can be used. This makes it possible to improve the thermal conductivity of the base 10. With regard to the dissipator device 100, it will preferably be made by folding from a pre-cut metal sheet or strip. This technique allows, unlike molding or stamping, to easily obtain thin thicknesses. Typically, the thickness of the folded sheet corresponds to the thickness of the dissipating walls 102. The dissipating elements 101 thus having a large surface area and low thicknesses thus make it possible to optimize the surface of exchange with the air and of very rapidly dissipate the calories coming from the base 10 to the dissipating device 100. By injection, because of the necessary remains and the arrangement of the injectors, it would be much more difficult to obtain a high density of thin walls. Preferably, the dissipating elements 101 are made of aluminum.
    [0016] The base 10 and the dissipating elements 101 thus have two complementary functions which, in synergy, allow a very efficient cooling of the LEDs 2. The base 10 extracts the calories produced by the LEDs 2, stores them and can transfer them quickly to the dissipating elements. The dissipating elements 101, for their part, dissipate in the air by convection the calories reported by the base 10. As illustrated in FIG. 2, the attachment portions 107 of the dissipating elements 101 together form a base. 106 which ensures the attachment to the base 10 and the heat exchange by conduction with the base 10. This base 106 25 preferably has attachment ends 108 disposed in contact with the base 10 and on either side of the assembly. formed by the dissipating walls 102. In this example shown in Figures 1 and 2, the dissipating device 100 forms channels 103 parallel to each other. These channels 103 are formed by a folded accordion band. Two adjoining dissipating walls 102 are interconnected by a fold. Thus, some channels 103 'have a fold located at a proximal end 105 disposed at right base 10 and an opening located at a distal end 104. This promotes a good circulation of the air at the distal end 104 of the wall along the x axis. A channel 103 "adjacent the channel 103 'has a fold at its distal end 104 and an opening at a proximal end 105. This promotes air circulation at the base 10. This configuration therefore makes it possible to optimize the convective dissipation of the calories stored by the walls 103. It will be noted that, in a particularly advantageous manner, the presence of the attachment portions 107 makes it possible to ensure a good heat transfer between the base 10 10 and the dissipator device 100 while promoting the circulation of air within the channels 103. Indeed, these channels are widely open compared to a configuration in which the channels 103 would be formed by two-by-two joined fins. so as to form a "U", the ends of the branches of the "U" resting in part on the base 10 and 15 extending along the x-dimension, the invention offers the same advantage as before Furthermore, it offers the advantage of not closing the channel 103 over its entire dimension along the x axis, but only on the channel portion 103 in contact with the base 10, thereby improving the circulation of the air along the z axis and the dissipation of calories.
    [0017] With respect to a configuration in which the channels 103 would be formed by fins joined in pairs to form a "U", the bottom of the "U" extending perpendicularly to and from the base 10, the invention offers the advantage of increasing the exchange surface between the dissipating elements 101 and the base 10 without affecting the flow of air. Advantageously, and as illustrated in FIG. 2, the cooling member 1 comprises two dissipating devices 100a, 100b associated with the same base 10. The fixing portions 107 of the dissipating device 100a are fixed on the fixing face 11 while the fixing portions 107 of the dissipating device 100b are fixed on the face opposite to the fixing face 11. This configuration makes it possible to dissipate the calories even more efficiently. Preferably, the dissipating walls 102a of the dissipator device 100a are situated in line with the dissipating walls 102b of the dissipator device 100b. Two dissipative walls 102a, 102b thus form together a same dissipating wall 102a, of the same channel. The air can therefore more easily circulate along the z axis.
    [0018] FIGS. 3a to 3c illustrate several variants of the invention which can all be adapted to the same base 10. In each of these variants, the dissipating device 100 is preferably formed by a continuous sheet and folded so as to define the dissipating walls 102 parallel to each other and the fixing portions 107 perpendicular to the dissipating walls 102. There is thus continuity of material between the dissipating elements 101. FIG. 3a is a view from above (along the z axis) of the cooling member 1 illustrated in Figure 1. The dissipating device 100 comprises seven dissipating elements 101 15 together carrying fourteen dissipating walls 102 and thirteen channels 103. The distance between two dissipating walls 102 is consecutive and for example 6mm. Two consecutive dissipative walls 102 are interconnected by a rounded portion. The dissipating walls 102 at the end of the dissipator device 100 along the x-axis are shorter than those at the center. This increases the exchange surface with the central portion of the base 10, so as to promote the dissipation of calories while reducing clutter and weight where less dissipation is required. FIG. 3b is a view from above of the cooling member 1 of FIG. 2. With respect to the variant of FIG. 3a, that of FIG. 3b shows a lower density of the dissipating walls 102 and therefore of the channels 103. , here numbering ten and nine respectively. The weight of the dissipator device 100 is therefore reduced compared with that of FIG. 3a, but the exchange surface is smaller. This embodiment is preferred for systems generating less heat than those associated with the cooling member 1. FIGS. 3c to 3e show dissipating elements 101, all of which have the same length. The variant of Figure 3c has dissipating walls 3025293 16 102 connected in pairs by folds at right angles. The bottom of the "U" forms a right angle with the branches of the "U". The space between two dissipative walls 102 measures, in this non-limiting example, 4mm. The variants of FIGS. 3d and 3e show rounded folds between two consecutive dissipative walls 102. Typically, these cooling members weigh between 102 g (variant of Figure 3b) and 130 g (variant of Figure 3d). The dissipating walls 102 being formed of aluminum from a folded sheet and the base 10 being made of aluminum and silicon alloy formed by injection molding, forming or cutting.
    [0019] FIGS. 4b to 4h illustrate certain steps of producing a dissipator device 100 illustrated in FIG. 4a and which is close to that illustrated in FIG. 2. Stage 4b shows the cut sheet, before folding, which will serve the purpose of forming the entire dissipator device 100 of Figure 4a. This sheet forms a plane element, of substantially longitudinal shape, delimited by two longitudinal edges 119 each extending along the axis Y. This sheet defines the two attachment ends 108, the attachment portions 107 and fold lines 110, 111, 112.
    [0020] The fold lines 110, 111 extend transversely from one longitudinal edge 119 to the other. The fold lines 110, 111 are intended to form the junction two consecutive dissipative walls 102 (that is to say the bottom of a "U"). Depending on the folding and the disposition of the fold lines 110, 111, the bottom of the "U" will be rounded or flat. The lines 110 define the folds at the proximal ends 105 while the folds 111 define the folds at the distal ends 104. The attachment portions 107 are defined by the cuts 113, 114, 115 and each have a junction 116 with the dissipating wall 102 to which it is associated. This junction 116 is intended to be folded to allow the dissipating wall 102 to be contained in the plane zx and the attachment portion 107 to be contained in the xy plane.
    [0021] FIG. 4c illustrates a portion of sheet metal after folding at the folds 110 and 111. This sheet portion has two dissipating walls 102 defining a channel 103. The fixing portion 107 disposed on the left has been folded. It thus extends in the xy plane. The fixing portion 107 disposed on the right has not yet been folded and will be at the fold line 112 of the junction 116 as shown in Figure 4d. This figure clearly shows the clearance of an edge 117 formed by the cutting line 113 and which appears after folding. This edge 117 is intended to abut against the thickness of the base 110 to facilitate the setting in position and the holding in position of the dissipator device 100 on the base 10. FIG. 4e illustrates a partial view of the folded sheet showing the juxtaposition of five dissipating walls 102. The attachment portions 107a are folded and juxtaposed to each other. They thus form a continuous base 106 which optimizes the surface 109 of contact between the dissipator device 100 and the base 10. The portion 107b is itself illustrated in an unfolded position. According to Figure 4f, this portion 107b is folded by being folded under the bottom of the "U". Thus, all the attachment portions 107 are folded in the same direction of rotation. Note that this structure also allows a contact between the attachment portion 107b and the bottom of the "U", which improves the propagation of calories from the attachment portion 107b to the bottom of the "U" and the dissipating walls 102 adjacent to the "U".
    [0022] Figure 4g illustrates the dissipator device 100 viewed from below once fully folded. Figure 4h illustrates the dissipating device 100 seen in section along a plane xz. In these two last figures, it is clearly seen that the fixing portions 107 form a base 106 without empty space to increase the surface 109 of contact with the base 10. Thus, particularly advantageously, two adjacent fastening portions have a discontinuity. of matter but are contiguous or are distant a distance D low. D is typically less than 1/10 of the distance separating the two adjacent dissipating walls 102 at their proximal ends 105. This distance D is measured in a direction perpendicular to the direction in which the portions 102 extend, in illustrated examples this is the Y direction.
    [0023] In all of the embodiments described above, the air can flow in channels 103 freely along the z axis and also along the x axis except at either the proximal end 105 or the distal end. 104 of the channel 103. FIGS. 5a to 5c and 6a and 6b illustrate another embodiment of the invention in which the dissipating elements 101 form channels having in section, a closed periphery. In this nonlimiting example, the channels 103 extend along the z axis. They have in section, along the xy plane, a closed periphery, here a cellular periphery. Preferably, each dissipating element 101 has a proximal portion 15 forming a rectilinear wall extending along the x axis and which is prolonged by several blistered channels. 103. Preferably, each dissipating element 101 is obtained individually. It is not formed integrally with the dissipating element 101 which is adjacent thereto.
    [0024] The assembly of the dissipating elements 101 forms the dissipating device 100. Preferably, the juxtaposition of two dissipating elements 101 forms between these dissipating elements 101 cavities. The resulting assembly forms a continuous cellular structure. Preferably a dissipating element 101 is obtained by folding on itself a sheet of metal or a sheet. The two ends of the sheet being fixed to each other after folding, this fixing being provided preferably by clinching, crimping or electric welding. Advantageously, each rectilinear portion is formed by two dissipating walls 102 folded one over the other. Each dissipating wall 102 is extended by an attachment portion 107 folded in the plane perpendicular to that of the dissipating walls 102. The dissipating elements 101 are thus formed individually, but possibly simultaneously. They are then assembled and fixed to each other, preferably by clinching, crimping or electric welding. The assembly thus formed forms the dissipating device 100 illustrated in FIGS. 6a and 6b. It constitutes a subassembly ready to be reported on the base 10. It is possible to resort to a so-called submount process in which the fixing of an element, for example the diode, is carried out directly on a support, here the base, via glue or solder to optimize heat dissipation. This process involves the disappearance of the metal substrate on which the diode is mounted. Thus, a wirebonding is generally performed to a PCB remote from the diode, here a flexible PCB which connects the diode to a control circuit. Preferably, the attachment portions 107 extend over the entire dimension along the x axis of the proximal rectilinear portion. The continuous juxtaposition of these fixing portions 107 forms the base 106 for fixing, as illustrated in FIG. 6b, it is this base 106 for fixing which defines the contact surface 109 between the dissipating device 100 and the base 10. Thus, and as described for the previous embodiment, two adjacent fastening portions have a discontinuity of material but are contiguous or distant a distance D low, typically less than 1/10 of the distance separating the two dissipating walls 102 adjacent to the At the level of their proximal ends 105. Preferably, as illustrated in FIG. 5c, two dissipating devices 100a, 100b are reported on each of the faces of the base 10. Each cellular channel 103 formed by one of the dissipating devices 100a, 100b is extended by a honeycomb channel 103 of the other dissipating device 100a, 100b.
    [0025] To facilitate production and to reduce costs, the dissipating devices 100a, 100b are identical. In this embodiment, there is provided a reflector 12 disposed on the face of the base 10 which supports the LED 2. This embodiment thus provides a structure having an optimized exchange surface and allowing a free circulation of air in the channels 103 along the z axis. Depending on the weight and thermal power constraints to be dissipated, the density of the cells will be varied for the same size.
    [0026] FIGS. 7 to 10b illustrate several exemplary embodiments making it possible to reinforce the robustness of the dissipator device 100. These embodiments are combinable with each other and with the embodiments described with reference to the preceding figures. These embodiments will be very advantageous if they are applied to dissipating elements 101 obtained individually and fixed to each other to form a dissipating device 100. Nevertheless, they also apply to cases where all the dissipating elements 101 are formed in one piece, typically by folding a single sheet of metal. In this embodiment of FIG. 7, a bar 130 integral with some and preferably integral with all the dissipating walls 102 is advantageously provided. Advantageously, an edge of the dissipating walls 102 has a notch complementary to the shape of the bar 130 and configured to accommodate at least a portion of the bar 130. The bar 130, once inserted into the slot, can be attached to the dissipating walls 102 by welding or brazing. Thus, the cohesion of the dissipating walls 102 is enhanced.
    [0027] Figures 8a and 8b illustrate an embodiment in which the base 10 has a comb shape 131 having slots 132 disposed longitudinally along the y-axis and configured to be penetrated by the dissipating walls 102.
    [0028] Preferably, the dissipating walls 102 also have slots 133 configured to receive the comb 131 at the slots 132. The engagement of the slots 132 in the slots 133 allows a good attachment of the comb 131 on the dissipating walls 102, reinforced fixation if necessary by welding or brazing.
    [0029] Preferably, the comb 131 is obtained by cutting a metal sheet, in particular to form the slots 132 and by folding a border to form a rib 134 reinforcing the robustness of the assembly.
    [0030] FIGS. 9a and 9b illustrate an embodiment in which hooks 135 reinforce the fixing between the attachment portion 107 of a first dissipating wall 102 and a second dissipating wall 102 adjacent to this first dissipating wall 102.
    [0031] A hook 135 carried by the attachment portions 107 of the first dissipating wall 102 is provided to enter an opening 106 formed in the second dissipating wall 102 and close thereto. The hook 135 is configured to engage with the second dissipating wall 102. Advantageously, the hooks 135 form part of the metal sheet 10 constituting the dissipating walls 102. To ensure the activation of the hook fastening after juxtaposition of the dissipating walls 102 and fixing portions 107, the hooks 135 are folded by folding them so as to penetrate into the opening 136 of the adjacent fixing portion 107.
    [0032] FIGS. 10a and 10b illustrate an embodiment in which two consecutive attachment portions 107 have a male portion 136 and a female portion 137 configured to cooperate together to lock the two attachment portions 107. As shown in these FIGS. In FIGS., the attachment portions 107 carrying these two male 136 and female 137 portions form two pieces of a puzzle. This facilitates positioning and holding in position of the dissipating elements 101 between them. Thus a fixing portion carries a male portion configured to cooperate by interlocking with a female portion carried by a fixing portion adjacent thereto. The dissipating device is configured so that the engagement of the male and female portions prevents disengagement of the adjacent fastening portions when the adjacent fastening portions are relatively moved in a direction parallel (X or Y direction) to the plane of the the base. On the other hand, a relative displacement of the fixing portions in a perpendicular direction (Z direction) to the plane of the faces of the base makes it possible to disengage the fixing portions. Also, the dissipator walls of the dissipator have a particular shape based on the embodiment illustrated in FIGS. 4a to 4h, but modified to also approach the advantages of the above-described cellular embodiments. Unlike the dissipative walls illustrated in Figures 4a to 4h, they are corrugated instead of being flat. This increases the exchange surface.
    [0033] The corrugation thus generates an alternation of hollows and vertices on the faces of the dissipative walls. As in the example illustrated, the vertices of the faces of two adjacent walls forming an air channel, these faces being vis-à-vis, are vis-à-vis. Similarly, the hollows of these faces are vis-à-vis. This corrugation may for example be formed by a plurality of successive folds 10, for example the dissipative walls being in accordion. From the above description, it is clear that the invention offers a particularly effective solution for dissipating the calories stored by the base 10. The disposition of the dissipating walls 102, in particular their cantilever relative to the base 10, their possible formation by folding, the free air circulation they allow and the good heat transfer between the base 10 and the dissipating walls 102, enhance the efficiency of the heat dissipation. The invention is not limited to the previously described embodiments and extends to all the embodiments covered by the claims. In particular, the invention extends to dissipating devices 100 formed of dissipating elements 101 made individually and then assembled together or on the contrary of dissipating elements 101 bonded together and formed from the same family of metal.
    [0034] Furthermore, the invention is not limited to walls and channels having the shapes illustrated in the figures. It encompasses any form of walls and channels and extends in particular to walls forming fins.
    [0035] REFERENCES 1. Cooling member 2. Light source 5 3. Printed circuit 10. Base 11. Mounting face 12. Reflector 10 100. Heat sink 101. Heat sink 102. Wall 103. Channel 15 104. Distal end 105 Proximal end 106. Base 107. Fixation portion 108. Stand attachment end 20 109. Exchange surface dissipator / base device 110. Fold line 111. Fold line 112. Fold line 113. Cutout 25 114. Cutting 115. Cutting 116. Junction 117. Edge 118. Contact face between dissipating element and base 30 119. Longitudinal edge 130. Bar 131. Comb
    权利要求:
    Claims (18)
    [0001]
    REVENDICATIONS1. Cooling member (1) for a lighting and / or signaling system for a motor vehicle, the member (1) comprising a base (10) (10) having two opposite faces, at least one of which is configured to support a light source (2) of said system and at least one heat dissipating device (100) in heat conduction connection with said base (10), the dissipating device (100) comprising a plurality of dissipating elements (101), characterized in that each dissipator element (101) of said plurality comprises at least one dissipating wall (102) extending from a fixing face (11) taken from one of said faces of said base (10) and in a plane inclined relative to at the plane of the fixing face (11), the dissipating wall or at least some of the dissipating walls (102) of a dissipating element (101) being extended by a fixing portion (107) through which the dissipating element (101) ) is reported and attached said fixing face (11), the fixing portion (107) being integral with the corresponding dissipating wall (102) and extending mainly in the plane of said fixing face (11).
    [0002]
    2. Body according to the preceding claim wherein the fixing portion (107) and the corresponding dissipating wall (102) are formed by a folded sheet, a fold of this sheet separating the fixing portion (107) and the dissipating wall (102). ) corresponding.
    [0003]
    3. Body according to the preceding claim wherein the fixing portion (107) and the dissipating wall (102) are at an angle of 90 ° at the fold.
    [0004]
    4. Body according to one of claims 1 to 3 wherein the fixing portion (107) of a first dissipating wall (102) is reported in contact with one of: a second dissipating wall (102) adjacent to the first dissipative wall (102) or an attachment portion (107) of the second dissipative wall. 3025293 26
    [0005]
    5. Body according to one of claims 1 to 3 wherein the fixing portion (107) of a first dissipating wall (102) is reported at a distance less than the distance D of one of: the second dissipating wall (102) adjacent to the first dissipating wall (102) or the securing portion (107) of the second dissipating wall, the distance D being less than or equal to half the distance between the first and second dissipative walls (102) at the attachment portions (107).
    [0006]
    An organ according to any one of the preceding claims wherein the attachment portion (107) extends perpendicular to said dissipative wall (102) and extends thereto to form a fin.
    [0007]
    7. Body according to any one of the preceding claims wherein the dissipating element (101) forms a channel (103) of air circulation delimited by two dissipative walls (102), the channel (103) being open to two of its ends in a direction perpendicular to the attachment face (11) 15 and the channel (103) is open in a main extension direction which extends the dissipating wall (102).
    [0008]
    8. Body according to any one of the preceding claims wherein the dissipating element (101) forms a channel (103) of air circulation delimited by two dissipating walls (102), the channel (103) being open to two 20 its ends in a direction perpendicular to the attachment face (11) and the channel (103) is closed in the main extension direction.
    [0009]
    9. Body according to the preceding claim wherein the dissipating device (100) forms a honeycomb structure, each channel (103) forming a cell. 25
    [0010]
    10. Body according to any one of the preceding claims wherein the dissipating elements (101) are integrally formed integrally, two dissipating walls (102) adjacent having a continuity of material. 3025293 27
    [0011]
    11. Body according to any one of claims 1 to 9 wherein each dissipating element (101) is constituted by a separate folded sheet, the dissipating elements (101) being separate from the base (10) and fixed on the latter, in particular by glue or welding. 5
    [0012]
    12. Body according to any one of the preceding claims wherein the dissipator device (100) comprises at least one connecting element attached to at least a plurality and preferably all the dissipating walls (102) and connecting the dissipating walls ( 102) of said plurality. 10
    [0013]
    13. Body according to any one of the preceding claims wherein the dissipating device (100) comprises at least one hook (135) integral with a fixing portion (107) and configured to cooperate with an opening (136) formed in a adjacent fixing portion (107).
    [0014]
    An organ according to any one of the preceding claims, wherein a securing portion (107) carries a male portion (137) configured to cooperate by interlocking with a female portion (138) carried by an adjacent attachment portion (107). , the co-operation the male (137) and female (138) parts preventing the disruption of the adjacent attachment portions according to certain relative movements of the adjacent attachment portions (107). 20
    [0015]
    A lighting and / or signaling system for a motor vehicle comprising: - a cooling member (1) according to any one of the preceding claims, - a light source (2) supported by one of said opposite faces of 25 said base (10), and - an optical device configured to change the direction of the light radiation emitted by the source. 3025293 28
    [0016]
    16. A method of producing a cooling member (1) according to any one of claims 1 to 14 comprising in particular the following steps: - realize the base (10); 5 - realize the dissipating device (100) by performing at least the following steps: cutting a sheet to form at least one part intended to form a dissipating wall (102) of a dissipating element (101) and at least one part intended to forming an attachment portion (107) extending said wall; o bending of the sheet so that the fixing portion (107) is disposed in a plane inclined with respect to the plane of said dissipating wall (102); - Postpone the dissipating element (101) by fixing the fixing portion (107) 15 on one face of the base (10).
    [0017]
    17. Method according to the preceding claim wherein a plurality of at least dissipating elements (101) have a continuity of material between them and are formed from the same sheet.
    [0018]
    18. The method of claim 16 wherein a plurality of at least 20 dissipating members (101) are individually formed before being reported on the face of the base (10).
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    同族专利:
    公开号 | 公开日
    US10352526B2|2019-07-16|
    BR112017002082A2|2018-01-30|
    FR3025293B1|2021-02-19|
    CN107208858A|2017-09-26|
    WO2016030156A1|2016-03-03|
    JP6479965B2|2019-03-06|
    CN107208858B|2020-10-02|
    US20170219182A1|2017-08-03|
    JP2017526140A|2017-09-07|
    EP3186546A1|2017-07-05|
    MX368460B|2019-10-03|
    MX2017002611A|2017-05-19|
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    法律状态:
    2015-08-31| PLFP| Fee payment|Year of fee payment: 2 |
    2016-03-04| PLSC| Search report ready|Effective date: 20160304 |
    2016-08-31| PLFP| Fee payment|Year of fee payment: 3 |
    2017-08-31| PLFP| Fee payment|Year of fee payment: 4 |
    2018-08-30| PLFP| Fee payment|Year of fee payment: 5 |
    2019-08-30| PLFP| Fee payment|Year of fee payment: 6 |
    2020-08-31| PLFP| Fee payment|Year of fee payment: 7 |
    2021-08-31| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1458137A|FR3025293B1|2014-08-29|2014-08-29|COOLING UNIT FOR LIGHTING AND / OR SIGNALING SYSTEMS|FR1458137A| FR3025293B1|2014-08-29|2014-08-29|COOLING UNIT FOR LIGHTING AND / OR SIGNALING SYSTEMS|
    CN201580046646.6A| CN107208858B|2014-08-29|2015-08-04|Cooling member for lighting and/or signalling systems|
    EP15753914.9A| EP3186546A1|2014-08-29|2015-08-04|Cooling member for lighting and/or signalling system|
    PCT/EP2015/067992| WO2016030156A1|2014-08-29|2015-08-04|Cooling member for lighting and/or signalling system|
    JP2017511600A| JP6479965B2|2014-08-29|2015-08-04|Cooling element for lighting and / or signaling systems|
    BR112017002082-3A| BR112017002082A2|2014-08-29|2015-08-04|cooling system for lighting and / or signaling system|
    MX2017002611A| MX368460B|2014-08-29|2015-08-04|Cooling member for lighting and/or signalling system.|
    US15/500,695| US10352526B2|2014-08-29|2015-08-04|Cooling member for lighting and/or signaling system|
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