Lighting device, in particular for a motor vehicle

Abstract

The invention relates to a lighting device (2), in particular for a motor vehicle, the lighting device comprising: - a light source module (6) comprising a plurality of light elements (8), each light element (8) being, in particular, a light-emitting diode, the light source module (6) further comprising a first set of electrical interconnect zones (10) associated with the plurality of light elements (8), in particular for supplying power to the plurality of light elements (8); - a circuit board (14) comprising a second set of electrical interconnect zones (16) for supplying power to the light source module (6).

Description

Lighting device, especially for a motor vehicle

[0001] The field of the present invention is that of a lighting device, particularly for a motor vehicle. The present invention also relates to a method for assembling such a lighting device.

[0002] In certain lighting device configurations, an optical element, such as a lens, must be placed close to the light source, which may consist of multiple light-emitting elements, including light-emitting diodes (LEDs). These light-emitting elements must be connected to an electronic driver via electrical interconnect areas (or pads). It is common practice to interconnect two rows of electrical interconnect areas on the light source to two rows of electrical interconnect areas on a circuit board. This involves interconnecting the nearest rows with each other and the two furthest rows with each other. This requires the use of short wires and long wires placed over the short wires.

[0003] Mechanical interference can then occur between the electrical connecting wires and the face of an optical element located near these wires. Contact between these elements could damage them. In the case of electrical wires, the electrical connections could even be broken.

[0004] The invention aims to overcome at least these drawbacks.

[0005] The invention thus relates to a lighting device, particularly for a motor vehicle, comprising: a light source module including a plurality of light elements, each light element being in particular a light-emitting diode, the light source module further comprising a first set of electrical interconnection zones associated with the plurality of light elements, in particular for their power supply; an electronic board comprising a second set of electrical interconnection zones for supplying power to the light source module; wherein: the electrical interconnection zones of the first set of electrical interconnection zones are arranged in at least two rows, including a first row and a second row, at least one of these rows being substantially parallel to a longitudinal direction,the first row of the first set of electrical interconnection zones being closer to the second set of electrical interconnection zones than the second row of the first set of electrical interconnection zones; and the second row of the first set of electrical interconnection zones being further from the second set of electrical interconnection zones than the first row of the first set of electrical interconnection zones; the electrical interconnection zones of the first row of the first set of electrical interconnection zones being offset from the electrical interconnection zones of the second row of the first set of electrical interconnection zones in the longitudinal direction of the rows such that the electrical interconnection zones of the second row are at least partially opposite a gap, in particular perpendicular to the longitudinal direction,between two consecutive electrical interconnection zones of the first row, the electrical interconnection zones of the second set of electrical interconnection zones being arranged in at least two rows, including a first row and a second row, at least one of these rows being substantially parallel in the longitudinal direction, the first row of the second set being closer to the first set of electrical interconnection zones than the second row of the second set of electrical interconnection zones; and the second row of the second set of electrical interconnection zones being further from the first set of electrical interconnection zones than the first row of the second set of electrical interconnection zones,the electrical interconnection zones of the first row of the second set of electrical interconnection zones being offset from the electrical interconnection zones of the second row of the second set of electrical interconnection zones in the longitudinal direction such that the electrical interconnection zones of the second row are at least partially opposite an interval, in particular perpendicular to the longitudinal direction, between two consecutive electrical interconnection zones of the first row,the first set of electrical interconnection zones on the light source module and the second set of electrical interconnection zones on the electronic board being arranged relative to each other such that the electrical interconnection zones of the first row of the first set of electrical interconnection zones are opposite the electrical interconnection zones of the second row of the second set of electrical interconnection zones to ensure interconnection by an electrical conductor following a defined direction between each pair of opposite electrical interconnection zones,and the electrical interconnection zones of the second row of the first set of electrical interconnection zones are opposite the electrical interconnection zones of the first row of the second set of electrical interconnection zones to ensure interconnection by an electrical conductor following a defined direction between each pair of opposite electrical interconnection zones.

[0006] Thus, the electrical conductors of the rear row (i.e., the second row) of the first set of electrical interconnection zones pass through the front row (i.e., the first row) of the first set of electrical interconnection zones by passing through the gaps, and not over the electrical interconnection zones of that front row (or front rows when there are several) of the first set of electrical interconnection zones.

[0007] Similarly, the electrically conductive wires of the rear row (i.e., the second row) of the second set of electrical interconnection zones pass through the front row (i.e., the first row) of the second set of electrical interconnection zones by passing through the gaps, and not over the electrical interconnection zones of that front row (or front rows when there are several) of the second set of electrical interconnection zones.

[0008] The expression "substantially parallel" means that the direction of said row deviates by a maximum of 5° from the longitudinal direction.

[0009] The expression "at least partially aligned" means that at least some interconnection zones in one row are aligned with a gap between two consecutive electrical interconnection zones in another row. Specifically, this property may not hold true for interconnection zones located at one end of a row. In such cases, there is not necessarily an aligned gap in the other row.

[0010] The terms "front row" and "rear row" refer to the relative position of the rows in the first set of electrical interconnection zones (or the second set of electrical interconnection zones), with the rear row being further away from the other set than the front row.

[0011] In the case where the electrical interconnection zones of the first set of electrical interconnection zones or the second set of electrical interconnection zones are arranged in three or more rows, the electrical interconnection zones of the rearmost row are opposite the gaps between the interconnection zones of the rows ahead so that the electrical conductors of that rearmost row can pass through the rows ahead by passing through the gaps, and not over the electrical interconnection zones of those rows ahead.

[0012] Thanks to this invention, the electrical conductors run from the first set of electrical interconnection zones to the second set of electrical interconnection zones, staggered relative to each other along the longitudinal direction of the rows, thus preventing overlapping conductors. In particular, it avoids the presence of longer conductors passing over shorter ones, thereby preventing the risk of electrical short circuits.

[0013] Thus, the invention makes it possible to have electrical conductors that are all substantially the same length, including relatively short electrical conductors. This avoids the risk of electrical conductors rubbing or striking against, for example, an optical element.

[0014] In general, the invention provides at least the following advantages: It prevents mechanical contact between electrical connections and the rear face of the optical block (i.e., it prevents mechanical interference between electrical conductors and a nearby optical element). Contact between electrical conductors and the rear face could damage the conductors. In the case of wires, it could even break the electrical connections. It also reduces the overall height of electrical connections relative to the circuit board. Furthermore, it simplifies the manufacturing of electrical connections and increases their long-term reliability. For example, longer electrical connections are more susceptible to bending than shorter ones. By standardizing the length of the electrical connections, this risk is eliminated.The advantage of putting the connections on two rows is a saving of space compared to a single long line.

[0015] The light module may also include one or more of the characteristics described below, taken alone or in combination.

[0016] The longitudinal direction may correspond to the direction of the first and / or second row of the electrical interconnection zone set(s).

[0017] According to one aspect of the invention, at least two rows of the set or sets of electrical interconnection zones are substantially parallel, along the longitudinal direction.

[0018] Because of the offset between the electrical interconnection zones of the first row of a set of electrical interconnection zones relative to the electrical interconnection zones of the second row of the same set of electrical interconnection zones, the case where said rows are perpendicular to each other is excluded.

[0019] According to one aspect of the invention, the light elements have a principal axis of light emission defining a direction of light emission, and are arranged so as to define a flat light-emitting surface perpendicular to the direction of light emission. The flat light-emitting surface corresponds to the union of all the light-emitting surfaces of the light elements. In other words, all the axes of the light elements are oriented along the same direction of light emission defined by the principal axis of light emission perpendicular to the flat light-emitting surface.

[0020] According to one aspect of the invention, the electrical conductors are configured so as to be located on only one side of the plane defined by said flat light-emitting surface, this side being opposite to the side from which the light is emitted. In other words, the electrical conductors do not extend beyond the plane of the flat light-emitting surface.

[0021] According to one aspect of the invention, at least one of the rows is substantially parallel to the longitudinal direction. For example, if the rows of one or more assemblies are not parallel to each other, the longitudinal direction may only be the direction of one row among the rows of said assembly or assemblies.

[0022] According to one aspect of the invention, an electrical interconnection zone of one or more sets of electrical connection zones can be associated with a plurality of light elements.

[0023] Alternatively, each electrical interconnection zone of one or more sets of electrical connection zones can be associated with a respective lighting element.

[0024] Alternatively, at least two of the electrical interconnection zones within one or more sets of electrical connection zones can be associated with a single lighting element. In other words, these electrical interconnection zones are associated with a single lighting element to provide more electrical power.

[0025] This avoids the need for a single electrical conductor with a large cross-section, which is difficult to implement when there are multiple interconnection zones. In this way, the electrical current can be shared across several conductors with smaller cross-sections than if there were only one conductor.

[0026] In this way, electrical conductors of the same cross-section can be used for all electrical interconnection zones. This simplifies the manufacturing of the lighting device.

[0027] According to one aspect of the invention, said lighting device comprises an optical element, including at least one lens, or even at least two lenses. A lens is understood to be a transparent element, particularly transparent to visible light, comprising one or more light entry surfaces, one or more light exit surfaces, and optionally one or more surfaces for total internal reflection of light.

[0028] According to one aspect of the invention, at least one of the lenses of the optical element has at least one face positioned at least partially opposite at least some of the luminous elements of the light source module, in particular at a distance of less than 2 mm. Advantageously, said distance is also greater than 0.5 mm. This distance corresponds to the smallest distance separating the optical element from the luminous elements of the light source module.

[0029] According to one aspect of the invention, at least one of the electrical conductors is in the form of a conducting wire or a conducting ribbon, in particular with a circular, ellipsoidal or polygonal cross-section.

[0030] According to one aspect of the invention, the electrical conductor connecting the two opposite electrical interconnection zones extends along a geometric line that is perpendicular to the longitudinal direction.

[0031] Alternatively, the electrical conductor connecting the two opposite electrical interconnection zones extends along a geometric line that makes an angle with the longitudinal direction, the angle being greater than or equal to 45° and less than 90°.

[0032] A geometric line is understood to be a direction that connects opposite electrical interconnection zones.

[0033] According to one aspect of the invention, the light source module comprises a plurality of light elements, including in particular electroluminescent semiconductor elements, the number of which is greater than 10, or greater than 20, being for example between 20 and 150, in particular between 20 and 100.

[0034] According to one aspect of the invention, the light source module comprises a support on which the light elements are arranged, in particular light-emitting diodes (LEDs). The support for the light elements is a flat plate, in particular made of ceramic.

[0035] According to one aspect of the invention, the light-emitting element(s), in particular the light-emitting diodes (LEDs) of the light source module, comprise wavelength-converting elements. These wavelength-converting elements are arranged above the light-emitting semiconductor elements comprising the light-emitting element(s), in particular the light-emitting diode(s).

[0036] According to one aspect of the invention, each light-emitting diode (LED) comprises one or more electroluminescent semiconductor elements.

[0037] According to one aspect of the invention, the light source module comprises an encapsulation layer, particularly made of silicone, containing the light-emitting chips and the wavelength-converting elements. In this way, the light-emitting chips and said conversion elements can be protected from mechanical damage, such as scratches.

[0038] According to one aspect of the invention, the first set of electrical interconnection zones associated with the plurality of luminous elements arranged on the support, in particular a ceramic-based plate, on which the luminous elements are present, in particular electroluminescent semiconductor elements.

[0039] According to one aspect of the invention, the light source module is placed on a heat sink.

[0040] In one variant of the invention, the light source module is placed in an opening in the electronic board.

[0041] According to one aspect of the invention, for respectively the first set of electrical interconnection zones and / or the second set of electrical interconnection zones, the electrical interconnection zones in each row are spaced from each other at a constant pitch.

[0042] According to one aspect of the invention, for respectively the first set of electrical interconnection zones and / or the second set of electrical interconnection zones, the electrical interconnection zones of the second row are offset from the electrical interconnection zones of the first row by a fraction of a step of that first row, in particular along the longitudinal direction: by half a step; by the step in a row divided by the number of rows N in the set considered, N being a natural number greater than or equal to 3; or by an offset between 1 / 3 and 2 / 3 of the step.

[0043] According to one aspect of the invention, said interval is regular in the first row so that the electrical interconnection zones are arranged according to the pitch.

[0044] According to one aspect of the invention, the pitch is the same for the rows of each set.

[0045] According to one aspect of the invention, the center-to-center distance of the electrical interconnection zones connected by an electrical conductor, in particular by an electrical wire, is advantageously between 0.5 and 1 mm, preferably between 0.6 and 0.9 mm, more particularly between 0.7 and 0.8 mm.

[0046] This center-to-center distance allows positioning tools to be passed and electrical conductors to be welded onto electrical interconnection areas without tearing out electrical conductors already in position.

[0047] According to one aspect of the invention, for respectively the first set of electrical interconnection zones and / or the second set of electrical interconnection zones, the electrical interconnection zones in the first row and the electrical interconnection zones in the second row have the same constant pitch.

[0048] Alternatively, the electrical interconnection zones in the first row and the electrical interconnection zones in the second row have an irregular pitch.

[0049] In this scenario, for example, some electrical interconnection zones may be closer together along the geometric line, while other electrical interconnection zones may be more spaced out at the ends of the geometric line. This configuration allows for the placement of smaller light sources in the center and larger ones at the ends relative to the geometric line.

[0050] According to one aspect of the invention, the first and second rows of the same set of electrical interconnection zones are spaced apart from each other by a distance ∈ between the opposite edges of the electrical interconnection zones of the two rows, this distance ∈ being between 0 and 1 mm, more particularly between 0 and 0.1 mm. Advantageously, said distance ∈ is also greater than or equal to 0.01 mm.

[0051] Thus, the center-to-center distance of electrical interconnection zones measured perpendicular to the longitudinal direction is greater than or equal to the sum of the half-dimensions of each row of interconnection zones in that direction, with the distance ∈ (or a tolerance ∈). The half-dimensions of the interconnection zone rows can have different values.

[0052] According to one aspect of the invention, the electrical interconnection zones are formed by depositing an electrically conductive material, in particular a metallic material.

[0053] According to one aspect of the invention, the electrical conductors are welded on areas of electrical interconnection.

[0054] The invention further relates to a method of assembling a lighting device, in particular for a motor vehicle, as defined above, said method comprising the following steps: placing electrical conductors between the first set of electrical interconnection zones on the light source module and the second set of electrical interconnection zones on the electronic board, these electrical conductors extending, in particular, parallel to each other; soldering the electrical conductors to the electrical interconnection zones of the first set of electrical interconnection zones and the second set of electrical interconnection zones to ensure an interconnection by these electrical conductors between each pair of opposite electrical interconnection zones respectively on the light source module and on the electronic board.

[0055] According to one aspect of the invention, the method further comprises the following step: encapsulating the light-emitting chips and wavelength-converting elements, for example in silicone, so that said chips and wavelength-converting elements are protected, in particular from mechanical damage, such as scratches.

[0056] According to one aspect of the invention, the method comprises the following step: placing electrical conductors, in particular electrical wires, between the first set of electrical interconnection zones on the light source module and the second set of electrical interconnection zones on the electronic board, with a tolerance of about 0.1mm, preferably with a tolerance of about 1 µm.

[0057] Other features, details and advantages of the invention will become clearer upon reading the following description on the one hand, and several illustrative and non-limiting examples of embodiments given with reference to the attached schematic drawings on the other hand, in which:

[0058] Laest is a representation of a lighting device, seen from above, according to an example of an embodiment of the invention;

[0059] This is a side view, in perspective, of the lighting system of the;

[0060] This is a schematic representation of the electrical interconnection assemblies of the example implementation of the;

[0061] This is a schematic representation of the electrical interconnection assemblies according to another example of implementation;

[0062] This is a schematic representation of an electrical interconnection set according to an example of implementation;

[0063] This is a flowchart of a process for assembling the lighting device according to an example of implementation.

[0064] The features, variations, and different embodiments of the invention can be combined in various ways, provided they are not incompatible or mutually exclusive. In particular, variations of the invention may include only a selection of features, described hereafter in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage and / or to differentiate the invention from prior art.

[0065] Identical elements or elements with identical functions bear the same reference symbol. For the sake of brevity, only the differences between the presented embodiment examples are described.

[0066] Figures 1 to 5 illustrate a lighting device 2 comprising: a light source module 6, with relatively large dimensions, for example 27.8 mm x 10.8 mm around, comprising a plurality of light elements 8, each light element 8 being a light-emitting diode (LED). The light source module 6 further comprises a first set of electrical interconnection zones 10 associated with the plurality of light elements 8, for their power supply; an electronic board 14 comprising a second set of electrical interconnection zones 16 for supplying power to the light source module 6.

[0067] The electrical interconnection zones 12 of the first set of electrical interconnection zones 10 are arranged in two parallel rows 18, 20 in a longitudinal direction LR, of which a first row 18 and a second row 20.

[0068] The first row 18 of the first set of electrical interconnection zones 10 is closer to the second set of electrical interconnection zones 16 than the second row 20 of the first set of electrical interconnection zones 10 and the second row 20 of the first set of electrical interconnection zones 10 is further from the second set of electrical interconnection zones 16 than the first row 18 of the first set of electrical interconnection zones 10.

[0069] The electrical interconnection zones 12 of the first row 18 of the first set of electrical interconnection zones 10 are offset from the electrical interconnection zones 12 of the second row 20 of the first set of electrical interconnection zones 10 in the longitudinal direction LR, of rows 18, 20 so that the electrical interconnection zones 12 of the second row 20 are each opposite an interval 21, perpendicular to the longitudinal direction LR, between two consecutive electrical interconnection zones 12 of the first row 18.

[0070] The electrical interconnection zones 12 of the second set of electrical interconnection zones 16 are arranged in two parallel rows 22, 24 along the longitudinal direction LR, of which a first row 22 and a second row 24.

[0071] The first row 22 of the second set of electrical interconnection zones 16 is closer to the first set of electrical interconnection zones 10 than the second row 24 of the second set of electrical interconnection zones 16; and the second row 24 of the second set of electrical interconnection zones 16 is further from the first set 10 of electrical interconnection zones 12 than the first row 22 of the second set 16.

[0072] The electrical interconnection zones 12 of the first row 22 of the second set of electrical interconnection zones 16 being offset from the electrical interconnection zones 12 of the second row 24 of the second set of electrical interconnection zones 16 in the longitudinal direction LR such that the electrical interconnection zones 12 of the second row 24 are each opposite an interval 21, perpendicular to the longitudinal direction LR, between two consecutive electrical interconnection zones 21 of the first row 22,the first set of electrical interconnection zones 10 on the light source module 6 and the second set of electrical interconnection zones 16 on the electronic board 14 being arranged relative to each other such that the electrical interconnection zones 12 of the first row 18 of the first set of electrical interconnection zones 10 are opposite the electrical interconnection zones 12 of the second row 20 of the second set of electrical interconnection zones 16 to ensure interconnection by an electrical conductor 30, in the form of a conducting wire 30, following a defined direction between each pair of opposite electrical interconnection zones 12,and the electrical interconnection zones 12 of the second row 20 of the first set of electrical interconnection zones 10 are opposite the electrical interconnection zones 12 of the first row 22 of the second set of electrical interconnection zones 16 to ensure interconnection by an electrical conductor 30, in the form of a conducting wire 30, following a defined direction between each pair of opposite electrical interconnection zones 12.

[0073] The 8 light elements have a principal axis of light emission defining a direction of light emission, and are arranged to define a flat light-emitting surface perpendicular to the direction of light emission. The flat light-emitting surface corresponds to the union of all the light-emitting surfaces of the 8 light elements. In other words, all the axes of the 8 light elements are oriented along the same direction of light emission defined by the principal axis of light emission perpendicular to the flat light-emitting surface.

[0074] The electrical conductors 30 are configured so that they are located on only one side of the plane defined by the flat light-emitting surface. In other words, the electrical conductors 30 do not extend beyond the plane of the flat light-emitting surface. This side is the one opposite the side from which the light is emitted.

[0075] Said luminous device 2 comprises an optical element 40 comprising a lens.

[0076] The lens of the optical element 40 has a face 42 placed opposite the light elements 8 of the light source module 6, at a distance d1, d2 less than 2 mm.

[0077] The electrical interconnection zones 12 are formed by the deposition of an electrically conductive material.

[0078] The 30 electrical conductors are welded to the 12 electrical interconnection areas.

[0079] As can be seen in particular in figures 1, 3 and 4, each electrical interconnection zone 12 of the sets of electrical connection zones 10, 16, is associated with a respective light element 8.

[0080] As illustrated in the example above, the electrical conductors 30 connecting the two opposite electrical interconnection zones 12 extend along a geometric line LW which is perpendicular to the longitudinal direction LR

[0081] As illustrated in another example, the electrical conductors 30 connecting the two opposite electrical interconnection zones 12 extend along a geometric line LW which makes an angle A with the longitudinal direction LR, angle A being greater than or equal to 45° and less than 90°.

[0082] The center-to-center distance of the electrical interconnection zones 12 connected by an electrical wire 30 is advantageously between 0.5 and 1 mm, preferably between 0.6 and 0.9 mm, more particularly between 0.7 and 0.8 mm.

[0083] This center-to-center distance allows positioning tools to be passed and electrical conductors 30 to be welded onto electrical interconnection zones 12 without tearing out electrical conductors 30 already in position.

[0084] For the first set of electrical interconnection zones 10 and / or the second set of electrical interconnection zones 16, respectively, the electrical interconnection zones 12 in each row are spaced from each other at a constant spacing of Pi. This spacing is measured from the center to the center of adjacent electrical interconnection zones 12.

[0085] The said interval 21 is regular in the first row 18, 22 so that the electrical interconnection zones 12 are arranged according to the pitch Pi.

[0086] In the examples visible in figures 3 to 5, the step Pi is the same for the rows of each set 10, 16.

[0087] As can be seen in the figure, the light source module 6 includes a support 50 on which the light elements 8 are arranged, here light-emitting diodes (LEDs). The support 50 for the light elements 8 is a flat ceramic plate 50.

[0088] The LEDs 8 of the light source module 6, comprise several electroluminescent semiconductor elements 62 and wavelength converter elements 60, arranged above these electroluminescent semiconductor elements 62.

[0089] The light source module 6, mounted on a heat sink 64, includes a silicone encapsulation layer 66 containing the light-emitting chips 62 and the wavelength-converting elements 60. This protects the light-emitting chips 62 and the wavelength-converting elements 60 from mechanical damage, such as scratches. It should be noted that the encapsulation layer 66 is shown here as completely transparent, to allow the light-emitting chips 62 and the wavelength-converting elements 60 to be visible, thus facilitating understanding of the explanation.However, said encapsulation layer 66 may also include opaque parts, in particular between light-emitting chips 62 and wavelength-converting elements 60, the upper part of said encapsulation layer 66, located above the light-emitting surface – that is to say the part located on the side of the plane defined by said plane light-emitting surface identical to the side from which the light is emitted – remaining transparent in order to allow the light emitted by the light elements 8 to pass through.

[0090] Said luminous device 2 includes an adhesion layer 68, comprising silver, between the support 50 and the heat sink 64.

[0091] The first set of electrical interconnection zones 10 associated with the plurality of light elements 8 arranged on the ceramic base plate 50, on which the light elements 8 are present.

[0092] Now, with reference to the first 18, 22 and second 20, 24 rows of the same set of electrical interconnection zones 10, 16, are spaced from each other by a distance ∈ between the edges opposite the electrical interconnection zones of the two rows, this distance ∈ being between 0 and 0.1 mm. The half-dimensions d4 / 2 of the interconnection zone rows 18, 20, 22, 24 can have different values.

[0093] Thus, the center-to-center distance d3 of the electrical interconnection zones 12 measured perpendicular to the longitudinal direction LR is greater than or equal to the sum of half-dimensions d4 / 2 of each row of interconnection zone 12 in this longitudinal direction LR, with the distance (or tolerance) ∈.

[0094] As seen in the figure, an assembly method 100 of the light device 2 is shown. Said method 100 comprises the following steps: placing electrical conductors 30 between the first set of electrical interconnection zones 10 on the light source module 6 and the second set of electrical interconnection zones 16 on the electronic board 14, these electrical conductors 30 extending parallel to each other (S110), soldering the electrical conductors 30 to the electrical interconnection zones 12 of the first set of electrical interconnection zones 10 and of the second set of electrical interconnection zones 16 to ensure an interconnection by these electrical conductors 30 between each pair of electrical interconnection zones 12 opposite each other respectively on the light source module 6 and on the electronic board 14 (S120).

[0095] Thanks to the invention, the electrical conductors 30 run from the first set of electrical interconnection zones 10 to the second set of electrical interconnection zones 16, offset from each other in the longitudinal direction LR of the rows, thereby preventing overlap between the electrical conductors 30. In particular, it prevents longer electrical conductors 30 from passing over shorter ones. This avoids the risk of electrical short circuits.

[0096] Thus, the invention allows for relatively short electrical conductors 30 that are all substantially the same length. This avoids the risk of electrical conductors 30 rubbing or striking against the optical element 40.

[0097] In general, the invention provides at least the following advantages: It prevents mechanical contact between the electrical connections and the face 42 located opposite the electrical conductors 30 of the optical block 40. Contact between the electrical conductors 30 and the rear face 42 could damage the electrical conductors 30. In the case of the electrical wires 30, the electrical connections could even be interrupted. It reduces the overall height of the electrical connections relative to the electronic board 14. It simplifies the manufacturing of electrical connections and increases their long-term reliability. For example, longer electrical connections are more susceptible to bending than shorter ones. By standardizing the length of the electrical connections, this risk is eliminated.The advantage of putting the connections on two rows 18, 20, 22, 24 is a saving of space compared to a single long line.

[0098] Such a lighting device 2 is configured for use on a vehicle, in particular as a lighting and / or signaling device, or as an interior lighting device for the passenger compartment of said vehicle.

Claims

A lighting device (2), particularly for a motor vehicle, comprising: a light source module (6) comprising a plurality of light elements (8), each light element (8) being in particular a light-emitting diode, the light source module (6) further comprising a first set of electrical interconnection zones (10) associated with the plurality of light elements (8), in particular for their power supply; an electronic board (14) comprising a second set of electrical interconnection zones (16) for providing power to the light source module (6); wherein: the electrical interconnection zones (12) of the first set of electrical interconnection zones (10) are arranged in at least two rows (18, 20), of which a first row (18) and a second row (20) are included, at least one of these rows being substantially parallel to a longitudinal direction (LR), ,the first row (18) of the first set of electrical interconnection zones (10) being closer to the second set of electrical interconnection zones (16) than the second row (20) of the first set of electrical interconnection zones (10); and the second row (20) of the first set of electrical interconnection zones (10) being further from the second set of electrical interconnection zones (16) than the first row (18) of the first set of electrical interconnection zones (10); the electrical interconnection zones (12) of the first row (18) of the first set of electrical interconnection zones (10) being offset from the electrical interconnection zones (12) of the second row (20) of the first set of electrical interconnection zones (10) in the longitudinal direction (LR) such that the electrical interconnection zones (12) of the second row (20) are at least partially opposite an interval (21),in particular perpendicular to the longitudinal direction (LR), between two consecutive electrical interconnection zones (12) of the first row (18), the electrical interconnection zones (12) of the second set of electrical interconnection zones (16) being arranged in at least two rows (22, 24), including a first row (22) and a second row (24), at least one of these rows being substantially parallel along the longitudinal direction (LR), the first row (22) of the second set (16) being closer to the first set of electrical interconnection zones (10) than the second row (24) of the second set of electrical interconnection zones (16); and the second row (24) of the second set of electrical interconnection zones (16) being further from the first set of electrical interconnection zones (10) than the first row (22) of the second set of electrical interconnection zones (16),the electrical interconnection zones (12) of the first row (22) of the second set of electrical interconnection zones (16) being offset from the electrical interconnection zones (12) of the second row (24) of the second set of electrical interconnection zones (16) in the longitudinal direction (LR) such that the electrical interconnection zones (12) of the second row (24) are at least partially opposite an interval (21), in particular perpendicular to the longitudinal direction (LR), between two consecutive electrical interconnection zones (12) of the first row (22),- the first set of electrical interconnection zones (10) on the light source module (6) and the second set of electrical interconnection zones (16) on the electronic board (14) being arranged relative to each other such that the electrical interconnection zones (12) of the first row (18) of the first set of electrical interconnection zones (10) are opposite the electrical interconnection zones (12) of the second row (24) of the second set of electrical interconnection zones (16) to ensure interconnection by an electrical conductor (30) in a defined direction between each pair of opposite electrical interconnection zones,and the electrical interconnection zones (12) of the second row (20) of the first set of electrical interconnection zones (10) are opposite the electrical interconnection zones (12) of the first row (22) of the second set of electrical interconnection zones (16) to ensure interconnection by an electrical conductor (30) along a defined direction between each pair of opposite electrical interconnection zones (12). A luminous device (2) according to claim 1, wherein the luminous elements (8) have a principal axis of light emission defining a direction of light emission, and are arranged so as to define a flat light emission surface perpendicular to the direction of light emission, this flat light emission surface corresponding to the union of all the light emission surfaces of the luminous elements (8) and the electrical conductors (30) are configured so as to be located on only one side of the plane defined by said flat light emission surface, this side being opposite to the side from which the light is emitted. Light device (2) according to claim 1 or 2, comprising an optical element (40), comprising at least one lens, the lens having at least one face (42) placed at least partially opposite some at least of the light elements (8) of the light source module (6), in particular at a distance (d1, d2) less than 2mm. A lighting device (2) according to any one of claims 1 to 3, wherein the electrical conductor (30) connecting the two opposite electrical interconnection zones (12) extends along a geometric line (LW) which makes an angle (A) with the longitudinal direction (LR), the angle (A) being greater than or equal to 45° and less than or equal to 90°. A lighting device (2) according to any one of claims 1 to 4, wherein for respectively the first set of electrical interconnection zones (10) and / or the second set of electrical interconnection zones (16), the electrical interconnection zones (12) in each row (18, 20, 22, 24) are spaced from each other at a pitch (Pi) which is a constant pitch. A lighting device (2) according to any one of claims 1 to 4, wherein for respectively the first set of electrical interconnection zones (10) and / or the second set of electrical interconnection zones (16), the electrical interconnection zones (12) of the second row (20, 24) are offset relative to the electrical interconnection zones (12) of the first row (18, 22) by a fraction of a step (Pi) of this first row (18, 22), in particular along the longitudinal direction (LR): by half a step (Pi / 2); by the step (Pi) in a row divided by the number of rows N, (Pi / N) in the set (10, 16) considered, N being a natural number greater than or equal to 3; or by an offset between 1 / 3 and 2 / 3 of the step (Pi / 3 and 2Pi / 3). Light device (2) according to any one of claims 1 to 4, wherein the electrical interconnection zones (12) in the first row (18, 22) and / or the electrical interconnection zones (12) in the second row (20, 22) have an irregular pitch (Pi). A lighting device (2) according to any one of the preceding claims, wherein the first (18, 22) and second (20, 24) rows of the same set of electrical interconnection zones (10, 16) are spaced apart from each other by a distance (∈) between the edges opposite the electrical interconnection zones of the two rows, this distance (∈) being between 0 and 1 mm, more particularly between 0 and 0.1 mm. Assembly method (100) of a lighting device (2) according to any one of the preceding claims, said method comprising the following steps: placing electrical conductors (30) between the first set of electrical interconnection zones (10) on the light source module (6) and the second set of electrical interconnection zones (16) on the electronic board (14), these electrical conductors (30) extending, in particular, parallel to each other (S110), soldering the electrical conductors (30) to the electrical interconnection zones (12) of the first set of electrical interconnection zones (10) and of the second set of electrical interconnection zones (16) to ensure an interconnection by these electrical conductors (30) between each pair of electrical interconnection zones (12) opposite each other respectively on the light source module (6) and on the electronic board (14) (S120).

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