Back- lightable thermoplastic component for a luminous LOGO for motor vehicles and related production method

Abstract

Backlightable thermoplastic component (15) for a luminous logo (1) equipped with a first layer (2) comprising a first face (2' ) and a second face (2' ' ) opposite each other, an opaque sector (2a) and a transparent or semi-transparent sector (2b), wherein the shape of the transparent or semi- transparent sector (2b) follows the shape of the luminous symbol reproduced by the luminous logo (1), and an electrically powered lighting device (4) capable of selectively illuminating at least a part of the transparent or semi-transparent sector (2b) and comprising: a first light diffuser body (5a), shaped as a closed ring, a second light diffuser body (5b) surrounded by the first light diffuser body (5a), a plurality of light sources (8) adjacent to the first (5a) and / or second light diffuser body (5b), an electrical connection circuit (10) connecting the light sources (8) to an external electrical power source and comprising at least one wireless electrical power transmission device (12) electrically interposed between the internal light source (8' ) and the electrical power source and arranged to straddle the first light diffuser body (5a).

Description

[0001] "BACK- LIGHTABLE THERMOPLASTIC COMPONENT FOR A LUMINOUS LOGO FOR MOTOR VEHICLES AND RELATED PRODUCTION METHOD"

[0002] Cross-Reference to Related Applications

[0003] This Patent Application claims priority from Italian Patent Application No . 102024000027333 filed on December 3 , 2024 , the entire disclosure of which is incorporated herein by reference .

[0004] Technical Field

[0005] The present invention relates to a back-lightable thermoplastic component , a luminous logo / emblem equipped with said back-lightable thermoplastic component , the related method of operation and the related method of production .

[0006] More in detail , this invention relates to a backlightable thermoplastic component that contributes to forming a luminous logo or emblem that can be advantageously positioned on the bodywork of a motor vehicle , in particular an electric or hybrid motor vehicle . This application will be referred to below by way of example .

[0007] Known State of the Art

[0008] As is well known, motor vehicles such as cars , lorries and / or similar vehicles are usually equipped with logos or emblems on the front grille and / or rear tailgate to identi fy the manufacturer, model , type of fuel and / or other characteristics of the vehicle .

[0009] In more recent models , these logos can be selectively back-lightable to reproduce a luminous ef fect that allows the car manufacturer and / or model to be immediately identi fied even in the dark .

[0010] These back-lightable logos generally comprise one or more light guide prof iles / bars , which have the shape of the logo or emblem or the name of the car manufacturer to be reproduced and can be selectively illuminated by point light sources , such as LEDs , positioned immediately adj acent to the light guide bar ( s ) in order to convey the emitted light inside the latter .

[0011] However, these car logos often have rather complex shapes / geometries and feature one or more portions , such as circles , rhombuses , ovals , squares and / or letters , which are shaped as closed rings and are either intersecting with each other and / or surrounded by each other without interruption .

[0012] These automotive logos therefore comprise at least one closed-loop light guide bar that surrounds or intersects another light guide bar . Consequently, at least one internal portion / segment of one of the aforementioned light guide bars is continuously surrounded by the other, adj acent light guide bar . Furthermore , these light guide bars are often made in a single piece , i . e . they have a monolithic structure .

[0013] Experimental tests conducted by the Applicant have found that , by positioning the LEDs outs ide the light guide bars , it is virtually impossible to illuminate only a portion of the luminous logo , in particular the aforementioned internal portion, without having light leakage towards the adj acent light guide bars that are not to be illuminated, with the obvious disadvantages that this entails .

[0014] The unwanted light leakage towards the adj acent light guide bars , in fact , does not allow, for example , partial illumination of the logo and / or dynamic light ef fects .

[0015] There is therefore a need to provide a back-lightable thermoplastic component , a corresponding luminous logo and a corresponding production method that allow only part of the logo to be illuminated, avoiding light leakage into the adj acent portions of the luminous logo that are not to be illuminated .

[0016] The purpose of the present invention is to meet the above requirements in an optimi zed and economical manner .

[0017] Summary of the Invention

[0018] The above purpose is achieved by a light-transmitting component and a l ight-transmitting system as claimed in the attached claims , which form an integral part of this description .

[0019] Brief Description of the Drawings

[0020] For a better understanding of the present invention, a preferred form of implementation i s described below, by way of example and without limitation, with reference to the attached drawings , in which :

[0021] • Figure 1 is an exemplary and schematic view from below of a luminous logo made according to the present invention, with parts out of scale and parts removed for clarity, and

[0022] • Figure 2 is a side view, sectioned along section line I I- I I of Figure 1 , of the luminous logo shown in Figure 1 , with parts out of scale and removed for clarity .

[0023] Detailed Description of the Invention

[0024] With reference to Figure 1 , number 1 indicates a luminous or back-lightable logo / emblem / frieze as a whole . The luminous logo 1 may be suitable , for example , for positioning on the bodywork of a motor vehicle , for example on the front bonnet , rear boot or side panel .

[0025] According to the preferred embodiment of the invention, the luminous logo 1 is suitable for mounting on the bodywork of an electric vehicle , a plug-in hybrid electric vehicle and / or other similar hybrid vehicle .

[0026] It is understood that the luminous logo 1 can also be used in other applications besides the automotive industry, such as in sporting contexts to identi fy teams or sporting events , on sporting goods , clothing, household appliances , electronic devices , advertising proj ectors , signage , etc .

[0027] Preferably, the luminous logo 1 is an electrically powered lighting device that can be mounted on any car or other similar motor vehicle and is adapted to create one or more illuminated symbols that are easily visible even in the dark . For example , the luminous symbol may include the logo , initials , name , identi fying mark and / or other symbol that allows the model , power supply, equipment and / or manufacturer of the motor vehicle on which the luminous logo is mounted to be identi fied .

[0028] Preferably, the luminous logo 1 comprises a plastronic component , i . e . a component made of thermoplastic material that incorporates / embeds / includes electrical and / or electronic s / components . In other words , the luminous logo 1 comprises electronic and / or electrical components integrated / embedded / included on a thermoplastic support or sheet made , for example , by inj ection moulding .

[0029] With reference to the example illustrated in Figure 1 , the luminous logo 1 preferably has a plate-like structure . In addition, the luminous logo 1 preferably has a substantially flat shape . It is understood that the luminous logo 1 could also have a concave or convex shape , for example to adapt to the shape of the bodywork of the vehicle on which it may be mounted . According to the preferred embodiment of the invention, the luminous logo 1 preferably comprises a first sheet or layer or substrate 2 , which is advantageously made of one or more thermoplastic materials , such as polycarbonate , polypropylene , polymethyl methacrylate , acrylonitrile- butadiene-styrene and / or other similar thermoplastic polymers .

[0030] Layer 2 advantageously has a substantially flat shape / structure . In addition, layer 2 is advantageously shaped like a plate or shell .

[0031] Preferably, layer 2 lies on a plane orthogonal to a reference axis A. In other words , layer 2 preferably extends along a second axis B transversal , in particular orthogonal , to axis A and a third axis C transversal , in particular orthogonal to axis A and / or axis B .

[0032] Advantageously, layer 2 comprises an opaque sector 2a and a transparent or semi-transparent sector 2b, preferably complementary in shape .

[0033] The opaque sector 2a is preferably made of a material that is impermeable to light radiation . The transparent or semi-transparent sector 2b, on the other hand, is preferably made of a material that is permeable to light radiation . Preferably, the shape of the transparent or semi-transparent sector 2b follows the shape of the luminous symbol reproduced by the luminous logo 1 .

[0034] More in detail , the transparent or semi-transparent sector 2b preferably comprises at least a first portion 2b ' , which is shaped as a closed ring / loop and extends advantageously without interruption / seamlessly .

[0035] In addition, the transparent or semi-transparent sector 2b preferably comprises at least a second portion 2b ' ' advantageously surrounded without interruption by the first portion 2b' and / or intersecting the first portion 2b' .

[0036] Preferably, the first portion 2b' and / or the second portion 2b' ' also have an oblong shape.

[0037] Preferably, the first portion 2b' and the second portion 2b' ' are also coplanar along the plane defined by axes B and C.

[0038] For example, the second portion 2b' ' may intersect the first portion 2b', such that at least a part thereof is surrounded by the first portion 2b' .

[0039] More in detail, the second portion 2b' may also be shaped as a closed ring and may intersect the first portion 2b' at two points spaced apart from each other.

[0040] Layer 2 is preferably provided with two major faces 2' and 2' ' opposite each other along the reference axis A.

[0041] Preferably, the major face 2' is intended to face the front of the luminous logo 1, while the major face 2' ' is intended to face the rear of the luminous logo 1. For example, the front side of the luminous logo 1 is the side intended to face outwards once the logo is mounted on a motor vehicle, while the rear side is the side intended to face the bodywork of the motor vehicle.

[0042] With reference to the preferred embodiment illustrated in Figures 1 and 2, the luminous logo 1 also comprises an electrically powered lighting device 4, which is positioned adjacent to layer 2 and is adapted to selectively illuminate at least a portion of layer 2.

[0043] More in detail, the lighting device 4 is positioned facing the face 2' ' of layer 2, so as to be able to backlight the same face 2 ' ' .

[0044] Preferably, the lighting device 4 is adapted to selectively backlight at least part of the transparent or semi-transparent portion 2b of layer 2.

[0045] With reference to the example illustrated in Figure 2, the lighting device 4 comprises at least one light diffuser body / element 5, which is positioned immediately adjacent to the transparent or semi-transparent portion 2b of layer 2 and is adapted to diffuse light radiation, preferably in a substantially uniform manner, towards the latter.

[0046] Preferably, the light diffusing body 5 is arranged at the second face 2' ' of layer 2.

[0047] More in detail, the light diffusing body 5 comprises a light guide bar or profile 6, which has a shape complementary to the shape of the transparent or semi-transparent portion 2b of layer 2 and / or the graphic symbol reproduced by the luminous logo 1.

[0048] In addition, the light guide bar 6 is positioned immediately below the transparent or semi-transparent portion 2b of layer 2.

[0049] The lighting device 4 also comprises a plurality of light sources 8, in particular LEDs (Light Emitting Diodes) , which are arranged adjacent to the light diffuser body 5 and are oriented so as to direct the light produced inside the facing light diffuser body 5.

[0050] Preferably, the light sources 8 are arranged immediately below the opaque sector 2a.

[0051] Preferably, the light sources 8 each comprise at least one RGB (Red Green Blue) LED configured to emit light radiation with different wavelengths and therefore with different colours.

[0052] The light emitted by each light source 8 then propagates inside the body of the relative light diffuser body 5 by internal reflection, and is also emitted from at least one side surface of the same light di f fuser body 5 , so as to backlight the transparent or semi-transparent portion 2b of layer 2 .

[0053] Preferably, the lighting device 4 comprises a plurality of light sources 8 spaced apart from each other alongside the light di f fuser body 5 , for example with approximately constant spacing . The number and position of the light sources 8 are selected according to the dimensions of the light di f fusing body 5 . Preferably, the light sources 8 are also positioned approximately coplanar with the light di f fusing body 5 along the plane defined by axes B and C .

[0054] Preferably, the light sources 8 are also arranged at the second face 2 ' ' of layer 2 , adj acent to and facing the light di f fuser body 8 .

[0055] With reference to the example illustrated in Figure 1 , the lighting device 4 preferably also comprises an electrical connection circuit 10 for electrically connecting the light sources 8 to a source of electrical energy, such as a battery . The electrical connection circuit 10 comprises a plurality of electrical connections 10a, for example tracks made of electrically conductive material , each of which electrically connects a respective light source 8 to the source of electrical energy .

[0056] In addition, the electrical connection circuit 10 preferably also comprises at least one electrical connector 10b, adapted to be connected to the source of electrical energy and / or to an electronic control unit configured to control the operation of the light sources 8 .

[0057] With reference to the example illustrated in Figure 1 , the lighting device comprises at least two light di f fusing bodies 5a and 5b. At least one 5a of the two light diffusing bodies 5a and 5b is shaped as a closed ring and extends advantageously without interruption. Preferably, the other 5b of the two light diffusing bodies 5a and 5b has at least one portion / segment 5b' advantageously extending continuously around the first light diffusing body 5a and / or intersecting the first light diffusing body 5a.

[0058] For example, the second light diffuser body 5b may intersect the first light diffuser body 5a, such that at least one segment 5b' of the same second light diffuser body 5b is surrounded by the first light diffuser body 5a.

[0059] In the example illustrated in Figure 1, the second light diffuser body 5b is also shaped as a closed ring, extends advantageously without interruption and intersects the first light diffuser body 5a at two points spaced apart from each other. Therefore, the second light diffuser body 5b has a segment 5b' inside and / or surrounded by the first light diffuser body 5a and a segment 5b' ' outside the first light diffuser body 5a.

[0060] Preferably, segments 5a and 5b are also part of the same light-guiding body 5a with a monolithic structure. In other words, the two light-diffusing bodies 5a and 5b are preferably made in a single piece.

[0061] Preferably, the light diffuser body 5a is positioned immediately below portion 2b' of the transparent or semitransparent sector 2b of layer 2. The light diffuser body 5b, on the other hand, is positioned immediately below portion 2b' ' of the transparent or semi-transparent sector 2b of layer 2.

[0062] Advantageously, the light diffusing bodies 5a and 5b are coplanar with each other along the plane defined by axes A and B .

[0063] With reference to a different embodiment of the invention not illustrated, the second light diffuser body 5b may be surrounded without interruption by the first diffuser body 5a. In particular, the light diffuser bodies 5a and 5b may be separate and distinct from each other.

[0064] With reference to the preferred embodiment of the present invention, at least one of the light sources 8' is arranged inside the first diffuser body 5a, immediately adjacent to the inner segment 5b' of the second diffuser body 5b surrounded by the first diffuser body 5a, advantageously substantially without interruptions.

[0065] The aforementioned source of electrical energy, on the other hand, is positioned outside the first diffuser body 5a.

[0066] With reference to the preferred embodiment of the invention illustrated in Figures 1 and 2, the electrical connection circuit 10 also comprises a wireless power transmission device (wireless power transmission device) 12, which is electrically interposed between the light sources 8' and the electrical power source and is arranged astride the first light diffuser body 5a, so as to allow the transmission of electrical power from the electrical power source to the light source 8' located inside the first light diffuser body 5a. Preferably, the wireless power transmission device 12 is positioned coplanar with the light diffuser body 5.

[0067] Preferably, the wireless electrical power transmission device 12 is also arranged at the second face 2' ' of layer 2, adjacent to the light diffuser body 5.

[0068] In addition, the wireless electrical power transmission device 12 preferably has a thickness that approximates the thickness of the adj acent light di f fuser body 5 .

[0069] With reference to the illustrated example , in particular, the wireless electrical power transmission device 12 preferably comprises at least one power transmitter 12a, which is electrically connected to the electrical power source via a wired connection and is positioned outside the first light di f fuser body 5a, advantageously immediately adj acent to the latter .

[0070] In addition, the wireless electrical power transmission device 12 preferably comprises at least one power receiver 12b, which is electrically connected to the light source 8 ' via a wired connection and is positioned inside the first light di f fuser body 5a, advantageously immediately adj acent to the latter .

[0071] In other words , the power transmitter 12a and the power receiver 12b are preferably positioned on opposite sides of the first light di f fuser body 5a, preferably facing each other .

[0072] The power transmitter 12a and the power receiver 12b are preferably positioned at the second layer 2 ' ' and are preferably coplanar with each other along the plane defined by the axes B and C .

[0073] Preferably, the power transmitter 12a and the power receiver 12b each comprise a coil or inductor, which are inductively coupled to each other . In other words , the power transmitter 12a comprises an inductor adapted to be supplied with an alternating current , so as to induce an alternating current in the inductor of the power receiver 12b, thereby allowing the trans fer of electrical energy between the latter two . Preferably, the light diffuser body or bodies 4, the light sources 8, the electrical connection circuit 10 and / or the wireless electrical power transmission device 12 are coupled to the same major face 2' ' of layer 2.

[0074] With reference to the example illustrated in Figure 2, the luminous logo 1 preferably also comprises a second layer 14 (not shown in Figure 1) , which is made adjacent to the first layer 2.

[0075] The second layer 14 is preferably made by injection moulding .

[0076] The second layer 14 is preferably superimposed on the second major face 2' ' of the first layer 2, so as to cover the light diffuser body or bodies 4, the light sources 8, the electrical connection circuit 10 and / or the wireless electrical power transmission device 12, if present.

[0077] Preferably, the second layer 14 is made of an opaque thermoplastic polymer material, i.e. configured so as not to allow light radiation to pass through it. Advantageously, the shape of the second layer 14 follows the shape of the first layer 2.

[0078] The layer 14 preferably contributes to forming the rear side of the luminous logo 1.

[0079] Preferably, layer 2, the light diffusing body or bodies 4, the light sources 8, the electrical connection circuit 10 and / or the wireless electrical power transmission device 12 contribute to forming a back-lightable thermoplastic component 15 for the luminous logo 1. The back-lightable thermoplastic component 15 may also comprise layer 14. In addition to the back-lightable thermoplastic component 15, the luminous logo 1 may also comprise anchoring means for fixing it, for example, to the bodywork of a vehicle and / or other support, a front lens, a rear shell and / or other similar components.

[0080] The production of the back-lightable thermoplastic component 15 preferably comprises the following steps: a) prepare layer 2 with opaque section 2a and transparent or semi-transparent section 2b, b) position the light diffuser body 5 on one face 2' ' of layer 2, immediately below the transparent or semi-transparent sector 2a, c) position the light sources 8 adjacent to the light diffuser body 5, d) position the electrical connection circuit 10 on face 2' ' of layer 2, e) place the wireless electrical power transmission device 12 on the 2' ' face of layer 2 and connect it electrically to the electrical connection circuit 10 and to the light source (s) 8, f) place the semi-finished product comprising layer 2, light diffuser body 5, light sources 8, electrical connection circuit 10 and wireless electrical power transmission device 12 inside the cavity of an injection moulding machine or press, and g) overmould / overinj ect layer 14 on top of the semifinished product referred to in step f.

[0081] The operation of the back-lightable thermoplastic component 15, on the other hand, may involve the step of simultaneously activating all the light sources 8 so as to emit light radiation with a first wavelength or colour, for example white, and backlight the entire transparent or semitransparent portion 2b.

[0082] This phase can be used, for example, to backlight the luminous logo 1 and reproduce the relative graphic symbol , for example the vehicle logo .

[0083] Alternatively, the operation of the back-lightable thermoplastic component 15 may also include the phase of activating only a part of the light sources 8 , for example dynamically, so as to backlight only a part of the transparent or semi-transparent portion 2b . In addition, this phase may involve controlling the light sources 8 so that they emit light radiation with a colour other than white , for example blue .

[0084] From the above , the advantages of the back-lightable thermoplastic component 15 and the relative luminous logo 1 according to the invention are evident .

[0085] In particular, thanks to the wireless electrical power transmission device 12 , it is possible to provide a luminous logo 1 with even complex or articulated geometries , in which it is possible to precisely backlight also portions completely surrounded by other closed-loop portions , without light leakage or shadow areas .

[0086] In fact , the wireless electrical power transmission device 12 avoids the use of wired electrical connections that pass behind the light di f fuser body 5, thus preventing the formation of shadow areas behind it .

[0087] In addition, the wireless electrical power transmission device 12 allows a plurality of light sources 8 to be arranged immediately adj acent to the internal portions 5b ' of the second light di f fuser body 5 , so that those internal portions 5b ' can be effectively illuminated and the power of the relative light source 8 can be modulated to avoid light leakage towards the relative surrounding first light di f fuser body 5a . This in particular allows only a portion of the luminous logo 1 to be effectively illuminated, without light leakage towards the remaining portions of the luminous logo 1 that are not to be illuminated, so as not to compromise the aesthetic appearance and definition of the resulting illuminated graphic sign .

[0088] This is particularly advantageous in the automotive field, especially in the case of electric or plug-in hybrid vehicles, because it allows the luminous logo 1 to be illuminated completely in a first colour when the vehicle is in operation, and vice versa, it allows the luminous logo 1 to be illuminated, for example, with dynamic light effects or progressively depending on the state of charge during recharging of the battery of the vehicle housing the luminous logo 1 .

[0089] Finally, it is clear that modifications and variations may be made to the back-lightable thermoplastic component 15 and the relative luminous logo 1 according to the present invention, which nevertheless do not fall outside the scope of protection defined by the claims .

[0090] Colours, shapes and sizes may vary from those illustrated and schematised.

[0091] Clearly, the printed layers may be present in different numbers, just as, for example, substrates or additional layers may be present, which are optional in themselves .

[0092] Finally, according to one embodiment, the power transmitter 12a and the power receiver 12b each comprise an electrode, for example a capacitor plate, which are capacitively coupled to each other . In other words, the wireless electrical power transmission device 12 comprises a capacitor positioned astride the relative light diffuser body 5a .

Claims

CLAIMS1.- Back-lightable thermoplastic component (15) for a luminous logo (1) adapted to reproduce a luminous symbol, said component (15) comprising:- a first layer (2) , which has a first face (2' ) and a second face (2' ' ) opposite each other along a reference axis (A) and comprising an opaque sector (2a) and a transparent or semi-transparent sector (2b) , wherein the shape of the transparent or semi-transparent sector (2b) follows the shape of the luminous symbol reproduced by the luminous logo (1) , and- an electrically powered lighting device (4) adapted to selectively illuminate at least part of the transparent or semi-transparent sector (2b) , the transparent or semi-transparent sector (2b) comprising a first portion (2b' ) shaped as a closed ring and extending without interruption, and a second portion (2b' ' ) surrounded at least in part by the first portion (2b' ) , the lighting device (4) comprising:- a first light diffuser body (5a) , which is shaped as a closed ring and is positioned immediately below the first portion (2b' ) of the transparent or semi-transparent sector (2b) , a second light diffuser body (5b) , which is positioned immediately below the second portion (2b' ' ) of the transparent or semi-transparent sector (2b) and is surrounded at least in part by the first light diffuser body (5a) ,- a plurality of light sources (8) positioned adjacent to the first light diffusing body (5a) and / or the second light diffusing body (5b) and comprising at least oneinternal light source (8' ) arranged immediately adjacent to the second light diffusing body (5b) and surrounded by the first light diffusing body (5a) , an electrical connection circuit (10) for electrically connecting the light sources (8) to an electrical power source located outside the first light diffuser body (5a) , wherein the electrical connection circuit (10) comprises at least one wireless electrical power transmission device (12) , which is adapted to be electrically interposed between the internal light source (8' ) and the electrical power source and is arranged straddling the first light diffusing body (5a) in such a way as to allow the transmission of electrical power from the electrical power source to the internal light source (8' ) .2.- Component according to claim 1, also comprising a second layer (14) formed adjacent to the first layer (2) and superimposed at least on the second face (2' ' ) along the reference axis (A) .3.- Component according to claim 2, wherein the second layer (14) is made by injection moulding and is shaped so as to incorporate at least part of the first light diffuser body (5a) , the second light diffuser body (5b) , the light sources (8) and the electrical connection circuit (10) .4.- Component according to claim 1, 2 or 3, wherein the wireless electrical power transmission device (12) comprises at least:- a power transmitter (12a) , which is adapted to be electrically connected to the electrical power source and is positioned outside the first light diffuser body (5a) , anda power receiver (12b) , which is electrically connected to the internal light source (8' ) and is positioned inside the first light diffuser body (5a) , and is adapted to receive electrical power from the power transmitter ( ) to power the internal light source (8' ) .5.- Component according to claim 4, wherein the power transmitter (12a) comprises a first inductor and the power receiver (12b) comprises a second inductor inductively coupled to the first inductor.6.- Component according to claim 4, wherein the power transmitter (12a) comprises a first electrode and the power receiver (12b) comprises a second electrode capacitively coupled to the first inductor.7.- Component according to any of the preceding claims, wherein the second portion (2b' ' ) of the transparent or semitransparent sector (2b) is shaped as a closed ring, extends substantially without interruption, and intersects the first portion (2b' ) of the same transparent or semi-transparent sector (2b) at two points spaced apart from each other.8.- Component according to any of the preceding claims, wherein said light sources (8) comprise LEDs, which are arranged adjacent to the first light diffusing body (5a) and the second light diffusing body (5b) , respectively, and are oriented so as to direct the light produced inside the facing first light-diffusing body (5a) or second light-diffusing body (5b) .9.- Component according to any of the preceding claims, wherein the first light diffusing body (5a) , the second light diffusing body (5b) , the plurality of light sources (8) and the electrical connection circuit (10) are coupled to thesecond face (2' ' ) of the first layer (2) along the reference axis (A) .10.- Component according to any of the preceding claims, wherein the thickness of the wireless electrical power transmission device (12) approximates the thickness of the first light diffusing body (5a) along the reference axis (A) .11.- Method for manufacturing a backlightable thermoplastic component (15) made according to any of claims 2 to 10, the method comprising the steps of: a) providing the layer (2) , b) positioning the first light diffusing body (5a) on the second face (2' ' ) of the layer (2) , immediately below the first portion (2b' ) of the transparent or semi-transparent sector (2b) , and positioning the second light diffusing body (5b) on the second face (2' ' ) of the layer (2) , immediately below the second portion (2b' ' ) of the transparent or semi-transparent sector (2b) , c) position the light sources (8) adjacent to the first light diffuser (5a) and / or the second light diffuser (5b) , d) position the electrical connection circuit 10 on the face (2' ' ) of the layer (2) , placing the wireless electrical power transmission device (12) on the second face (2' ' ) of the layer (2) , straddling the first light diffuser body (5a) and connecting it electrically to the electrical connection circuit (10) and to the internal light source (s) (8' ) ,e) place the semi-finished product comprising the layer(2) , the first light diffuser body (5a) , the second light diffuser body (5b) , the light sources (8) and the electrical connection circuit (10) inside the cavity of an injection moulding machine, and f) overmould / overin ect the layer (14) on top of the semi-finished product referred to in step f.

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