Surface light guide for a vehicle

Abstract

The invention relates to a surface light guide (1) for a vehicle (3), the surface light guide comprising at least one group (10) of light injection elements (100) and a light guide layer (11), the group (10) being intended to be coupled to at least one light source (20), characterised in that the light guide layer (11) comprises: - at least one light-emitting zone (111); and - at least one zone (115) configured to arrange a human-machine physical interface (25).

Description

Surface light guide for vehicle

[0001] The present invention relates to a surface light guide for a vehicle. It finds a particular but non-limiting application in motor vehicles.

[0002] A surface light guide known to those skilled in the art comprises at least one group of light injection elements and a light guide sheet, said group being configured to be coupled to at least one light source. The light injection elements are folded to form a stack. The stack has an input surface configured to receive light rays emitted by said at least one light source. The light guide makes it possible to illuminate surfaces of interior elements of the vehicle such as for example the dashboard or the central console of the vehicle.

[0003] A disadvantage of this state of the art is that when the interior element also includes physical human-machine interfaces such as rotary knobs or push buttons for example, a fairly large surface area is required to integrate both the functions performed by the physical human-machine interfaces and the illumination function of the interior element performed by the light guide.

[0004] In this context, the present invention aims to provide a light guide which makes it possible to solve the mentioned drawback.

[0005] To this end, the invention proposes a surface light guide for a vehicle, said light guide comprising at least one group of light injection elements and a light guide sheet, said group being intended to be coupled with at least one light source, characterized in that said light guide sheet comprises: at least one light emission zone, and at least one zone configured to provide a physical human-machine interface, otherwise called a human-machine interface zone.

[0006] Thus, as will be seen in detail later, said at least one zone makes it possible to reduce the surface area of ​​the interior element which accommodates both the light guide and the physical human-machine interfaces since the physical human-machine interface(s) are superimposed on the light guide at the level of the zone(s) dedicated to this purpose in the light guide sheet. This reduces the size and cost of the interior element.

[0007] According to non-limiting embodiments, said light guide may further comprise one or more additional characteristics taken alone or in all technically possible combinations, among the following.

[0008] According to a non-limiting embodiment, said light-emitting zone may comprise a light pattern.

[0009] According to a non-limiting embodiment, said physical human-machine interface is a rotary button, a window regulator, a push button.

[0010] According to a non-limiting embodiment, said light guide comprises capacitive detection means which define a capacitive detection zone in the light guide sheet to provide the physical human-machine interface. Thus, this makes it possible, using a finger, to activate a function such as the activation of the air conditioning, the heating, the volume adjustment of the radio, the air conditioning, the heating, etc.

[0011] According to the preceding paragraph and in the example where the light-emitting zone comprises a light pattern, the capacitive detection means are arranged opposite or in the immediate vicinity of the capacitive detection means and the light pattern may have the form of a pictogram or a symbol representing a function of the dashboard. An example of a pictogram that may be used is the double arrow arranged vertically or horizontally indicating the directions for reducing or increasing the volume of the speaker or the intensity of the air conditioning inside the vehicle. Of course, other examples of pictograms associated with other adjustment controls of the vehicle may be envisaged. Thus, the presence of the light pattern next to the capacitive detection means makes it possible to indicate the capacitive detection zone and therefore to control the function associated with it by touching the finger.

[0012] According to a non-limiting embodiment, said capacitive detection means comprise at least one antenna, at least one dielectric and a plurality of electrodes. The dielectric makes it possible to obtain a segmentation of the capacitive detection zone into several detection zones.

[0013] According to a non-limiting embodiment, said capacitive detection means are printed on said light guide sheet.

[0014] According to a non-limiting embodiment, said capacitive detection means are in the form of a film glued to said light guide sheet.

[0015] According to a non-limiting embodiment, said film is transparent or non-transparent. The transparent film makes it possible to superimpose the capacitive function with a light pattern which is illuminated. The non-transparent film is less expensive than the transparent film.

[0016] According to a non-limiting embodiment, when the film is transparent, said light pattern is arranged opposite said capacitive detection zone.

[0017] According to a non-limiting embodiment, when the film is non-transparent, said light pattern is arranged in the immediate vicinity of said capacitive detection zone.

[0018] According to a non-limiting embodiment, said light guide further comprises a decorative mask configured to mask the capacitive detection means.

[0019] According to one embodiment, the light guide sheet comprises: a cutting area dedicated to a physical human-machine interface of the rotary button, or window regulator, or push button type, called a mechanical interface; a capacitive detection area where capacitive detection means are arranged, called a capacitive interface; and a light pattern, said capacitive detection means being arranged opposite or in the immediate vicinity of said capacitive detection means. This is an embodiment in which the light guide integrates different types of physical human-machine interface. This allows for a compact installation of the interfaces inside the vehicle, in particular at the level of the vehicle dashboard.

[0020] According to a non-limiting embodiment, said light guide comprises a plurality of light-emitting zones, each light-emitting zone comprising a light pattern. Thus, it is possible to have several illuminated patterns among which at least one pattern is associated with the capacitive detection means and the remaining patterns mainly provide the decorative function. In this way, the light guide is a multifunctional part present with the function of a physical human-machine interface and the decorative function.

[0021] According to a non-limiting embodiment, said light guide sheet comprises a plurality of zones. Thus, it is possible to integrate several human-machine interfaces at the level of the light guide.

[0022] There is also provided a lighting device for a vehicle, said lighting device comprising at least one light guide according to any one of the preceding characteristics and at least one associated light source.

[0023] There is also provided an interior element for a vehicle comprising at least one light guide according to any one of the preceding characteristics and at least one associated light source.

[0024] The invention and its various applications will be better understood by reading the following description and examining the accompanying figures:

[0025] is a schematic illustration of a surface light guide according to a non-limiting embodiment of the invention, the light guide comprising at least one group of light injection elements and a light guide sheet with zones which are dedicated to human-machine interfaces and at least one light emission zone comprising a light pattern,

[0026] is a view of the light guide on which the physical human-machine interfaces are arranged in the areas specifically dedicated to it,

[0027] is a view of the light guide with the light injection elements unfolded,

[0028] is an enlarged view of a portion of light injection elements of a same group of light injection elements of the light guide according to the,

[0029] is a view of one face of the stack formed by the light injection elements of the,

[0030] is a schematic illustration of the light guide in which a capacitive detection zone is defined in the light guide sheet by means of capacitive detection means,

[0031] is a schematic figure of the capacitive detection means defining the capacitive detection zone of the and which comprise at least one antenna, at least one dielectric, and at least one electrode,

[0032] is an illustration of a first non-limiting example of a light pattern arranged opposite the capacitive detection zone of the when the capacitive detection means of the are printed on said light guide sheet according to a first non-limiting embodiment,

[0033] is an illustration of a second non-limiting example of a light pattern arranged opposite the capacitive detection zone of the when the capacitive detection means of the are printed on said light guide sheet according to a first non-limiting embodiment,

[0034] is an illustration of a first non-limiting example of a light pattern arranged opposite the capacitive detection zone of the when the capacitive detection means of the are in the form of a film glued to said light guide sheet according to a second non-limiting embodiment,

[0035] is an illustration of a second non-limiting example of a light pattern arranged opposite the capacitive detection zone of the when the capacitive detection means of the are in the form of a film glued according to a second non-limiting embodiment,

[0036] is a schematic side view of a non-limiting embodiment of a human-machine interface configured to be disposed at an area of ​​the light guide of the.

[0037] Identical elements, by structure or function, appearing in different figures retain, unless otherwise specified, the same references.

[0038] The light guide 1 according to the invention is described with reference to Figures 1 to 11. In a non-limiting embodiment, the light guide 1 is a light guide for a vehicle. In a non-limiting embodiment, the vehicle (not shown) is a motor vehicle. By motor vehicle is meant any type of motorized vehicle. This embodiment is taken as a non-limiting example in the remainder of the description. In the remainder of the description, the vehicle is thus otherwise called a motor vehicle. In a non-limiting variant embodiment, the vehicle is a thermal vehicle or an electric vehicle.

[0039] The light guide 1 is surface-mounted. Thus, it can be adapted to any type of flat or curved surface. A surface-mounted light guide is understood to mean an optical guide element in which one of the dimensions is much smaller than the other two dimensions in space, for example smaller by one or more orders of magnitude. Here, the thickness of the light guide 1 is much smaller than its length and its width. In a non-limiting embodiment, the light guide 1 has a thickness of between 10 and 1000 µm (micrometers). In a non-limiting alternative embodiment, the thickness is between 50 and 1000 µm. In a non-limiting example, the thickness is 50 µm. The light guide 1 is thus very thin.

[0040] In a non-limiting embodiment, said light guide 1 is flexible. By flexible, it is understood that the light guide 1 is adapted to be bent without being damaged or without breaking. It can thus be integrated into a lighting device 2 illustrated schematically on the and follow curves linked to a particular style of said lighting device 2. The lighting device 2 thus comprises the light guide 1 and at least one associated light source 20.

[0041] In a non-limiting embodiment, the light source 20 is a semiconductor light source. In a non-limiting embodiment, the semiconductor light source is part of a light-emitting diode or a laser diode. By light-emitting diode, we mean any type of light-emitting diode, whether in non-limiting examples LEDs (Light Emitting Diodes), OLEDs (Organic LEDs), AMOLEDs (Active-Matrix-Organic LEDs), or FOLEDs (Flexible OLEDs). In a non-limiting embodiment, the light source 20 is composed of several distinct emitters. In a non-limiting example, the light-emitting diode is an RGB diode. The RGB light source is said to be multi-source with three RG and B emitters which have different sizes and with different geometric arrangements.In a non-limiting embodiment, the light source 20 is arranged on an electronic support 21 (illustrated in the). In a non-limiting embodiment, the electronic support 20 is a printed circuit board otherwise called in English “Printed Circuit Board Assembly”.

[0042] In a non-limiting embodiment, the light device 2 is arranged in an interior element 8 of a vehicle or on all or part of a vehicle front face. A part of the front face may be the grille or the bumper in non-limiting examples. In non-limiting examples, the interior element 8 illustrated schematically in the is the dashboard, the central console, a door, or the cockpit of the vehicle. Thus, the interior element 8 comprises the light guide 1 and the light source 20 of the light device 2.

[0043] Due to the fact that it is surface-mounted and flexible, the light guide 1 is configured to be placed on the interior element 8 of the vehicle.

[0044] In a non-limiting embodiment, the light guide 1 is made of polycarbonate (PC), polymethyl methacrylate (PMMA), thermoplastic polyurethane (TPU), or polyethylene terephthalate (PET). Such materials make it possible to produce a flexible light guide 1.

[0045] The light guide 1 comprises: at least one group 10 of light injection elements 100, and a light guide sheet 11.

[0046] The light guide sheet 11 comprises: at least one light emitting zone 111 comprising a light pattern 1110, and at least one zone 115 configured to provide a physical human-machine interface 25.

[0047] It will be noted that when the light guide 1 is integrated into an interior element 8, in this case, the light pattern 1110 is seen by an observer who is inside the vehicle. The light pattern 1110 is formed by a plurality of microstructures making it possible to decouple the light from the light guide 1. In the non-limiting example illustrated in FIGS. 1 to 3 and 6, the light pattern 1110 is arranged in a light emission zone 111 having a rectangular shape.

[0048] In a first non-limiting embodiment, the physical human-machine interface 25 is a rotary knob, a window regulator, or a push button. In a second non-limiting embodiment, alternatively or cumulatively, the physical human-machine interface 25 is a capacitive detection zone 116 (described later).

[0049] As illustrated in Figures 1 and 2, the light guide 1 comprises a group 10 of light injection elements 100 and the light guide sheet 11 comprises a light emission zone 111 and two zones 115 dedicated to human-machine physical interfaces. In a non-limiting embodiment, as illustrated in Figures 1 and 2, the zones 115 are defined in the light emission zone 111 of the light guide sheet 11.

[0050] As illustrated in the, two physical human-machine interfaces 25 are arranged at the level of the two cutting zones 115 respectively. In the non-limiting example, these are rotary knobs. In this case, the zones 115 are cutting zones 115 in the light guide sheet 11. In the non-limiting example illustrated, the cutting zones 115 form orifices which make it possible to receive the rotary knobs 25 and to allow the rotary knobs 25 to pass through the light guide sheet 11.

[0051] As illustrated in the, in the case of the first non-limiting embodiment of the human-machine interfaces 25, the human-machine interfaces 25 have a central stud 25.1 configured to be inserted into the cutting areas 115 and a head. 25.2 In a non-limiting embodiment, the dimensions of the cutting areas 115 are slightly smaller than the dimensions of the head 25.2 of the human-machine interfaces 25 to avoid light leaks. Thus, in the non-limiting example illustrated in the and the, the central stud 25.1 of the rotary knobs 25 is inserted into the cutting areas 115 and their head 25.2 covers the edges of the cutting areas 115 through which there may be light leaks. The head 25.2 is opaque so as not to let light pass. Thus, in a non-limiting example, if a cutting zone 115 has a diameter d of 45mm (millimeters), the head 25.2 of the rotary button 25 has a diameter d'' greater than 50mm and the central stud 25.1 of the rotary knob 25 has a diameter of less than 45 mm to allow the insertion of the central stud 25.1 into the cutting zone 115.

[0052] As illustrated in Figures 1 to 3, the light guide sheet 11 extends in a first direction y and in a second direction z substantially perpendicular to the first direction y and to a third direction x. It will be noted that the width La and the length Lg of the light guide sheet 11 may be equal. As illustrated in the, in the unfolded state, the light injection elements 100 extend mainly along the first direction y in a non-limiting embodiment. The dimension measured in this first direction y is thus considered to be the length Lg' of the light injection element 100 as illustrated in the.

[0053] It will be noted that during the manufacturing process of the light guide 11, the light injection elements 100 and the light guide sheet 11 are manufactured from a large sheet which is sheared on one end to separate the different light injection elements 100 along the y axis illustrated in the (in the non-limiting example illustrated) and thus form the different light injection elements 100 and the light guide sheet 11. The light injection elements 10 are thus obtained by shearing the large sheet. Thus, the light injection elements 100 remain attached to the light guide sheet 11 on one of their ends.

[0054] The large sheet from which the light guide sheet 11 and the light injection elements 100 are formed comprises a core (which is a flexible film) and shell layers arranged on either side of the core. A layer of glue or adhesive is located between the flexible film and the shell layers. The layer of glue or adhesive has a refractive index different from that of the flexible film so as to propagate the light rays in the flexible film by total internal reflection, hence the use of the name "light guide" to designate the entirety of the guide sheet and the light injection elements.

[0055] The groups 10 and the light injection elements 100 are described in detail below.

[0056] In a non-limiting embodiment, the number of groups 10 is between two and twenty.

[0057] A group 10 may comprise one or more light injection elements 100. In a non-limiting embodiment, it comprises between three and ten light injection elements 100. In a non-limiting alternative embodiment, it comprises ten light injection elements 100.

[0058] A group 10 is coupled with at least one light source 20. Said at least one light source 20 is configured to emit light rays R (illustrated on the) which will propagate by total reflection in the light injection elements 100 of the group 10 so as to bring light to the light guide sheet 11 which is adjacent to the light injection elements 100 and which will thus illuminate the light emission zone(s) 111 of the light guide sheet 11. In a non-limiting embodiment, a group 10 is coupled with a plurality of light sources 20. In another non-limiting embodiment, a group 10 is coupled with a single light source 20. This latter non-limiting embodiment is taken as a non-limiting example in the remainder of the description. Thus, the light guide 11 coupled to the light source 20 makes it possible to perform an illumination function of the light pattern(s) 1110.

[0059] As illustrated in the, a light injection element 100, otherwise called coupling bar 100, or light bar 100, or simply bar 100, is configured to receive the light rays R emitted by the light source 20. The light injection element 100 is of rectangular or square section. The light injection element 100 comprises a length Lg' (illustrated in the), a width La' (illustrated in Figures 3 to 5) and a thickness e (illustrated in the). Its thickness e is that of the thickness of the light guide sheet 11. The light injection element 100 comprises two ends 100.1, one of which is directly adjacent and attached to the light guide sheet 11 and the other (illustrated in the) is configured to face said light source 20. The light rays R emitted by the light source 20 enter through one end 100.1 and are transmitted to the other end 100.1 and then to the light guide sheet 11.

[0060] As illustrated in the, the light injection elements 100 are composed of: a main part 100.2 which extends along the y-axis, namely in the first direction of the light guide sheet 11, and an end part 100.3 which extends along the z-axis, namely in the second direction of the light guide sheet 11.

[0061] The main part 100.2 is connected to the light guide sheet 11. The two parts 100.2 and 100.3 are separated by a fold 100.4. The end part 100.3 extends after the fold 100.4. In a non-limiting embodiment, the fold 100.4 is a right-angled fold. The length Lg' of a light injection element 100 is the sum of the dimension of the main part 100.2 and the end part 100.3.

[0062] Illustrates the end portions 100.3, the main portions 100.2 of light injection elements 100 of a group 10 and the fold 100.4 which separates them. Illustrates the end portions 100.3 of ten light injection elements 100 of a group 10 and a light source 20 coupled to said group 10.

[0063] As illustrated in the, each light injection element 100 thus comprises a fold 100.4. Thus, in each group 10, the light injection elements 100 are folded so that their end portions 100.3 form a stack 103 (illustrated in the) with a thickness E adapted to an emission surface of the light source 20. The thickness E is the sum of the thicknesses e of each light injection element 100 whose end portions 100.3 form the stack 103. The stack 103 thus has an entry surface 103.1 formed by the ends of the end portions 100.3 of each of the light injection elements 100 of the group 10, and configured to receive the light emitted by the light source 20.

[0064] As illustrated in the, in a non-limiting embodiment, the light source 20 coupled to the group 10 is arranged opposite the entry surface 103.1 of the stack 103. The light rays R from the light source 20 enter through this entry surface 103.1 and thus propagate in the light injection elements 100. The light rays R are totally reflected inside the light injection elements 100 and are redirected via the folds 100.4 towards the light guide sheet 11. The light emerges through the light emission zone(s) 111 of the light guide sheet 11 and will thus make it possible to illuminate the light pattern(s) 1110.

[0065] As illustrated in Figures 1 and 2, the light emitting area 111 includes the light pattern 1110. This is why the reference 111 / 1110 has been used.

[0066] In a non-limiting embodiment illustrated in the, the light guide 10 further comprises capacitive detection means 16 which define a capacitive detection zone 116 in the light guide sheet 11 to produce a human-machine interface 25. In other words, a capacitive function is integrated into the light guide 1 to produce the human-machine interface 25. The zone 116 is therefore a zone configured to provide a physical human-machine interface.

[0067] In the illustrated example, the capacitive detection zone 116 is located at the level of the cutting zone 115.

[0068] In a non-limiting embodiment, the capacitive detection means 16 comprise at least one antenna 160, at least one dielectric 161 and a plurality of electrodes 162. In the non-limiting example illustrated in the, they comprise an antenna 160, a dielectric 161 and a plurality of electrodes 162. The capacitive detection means 16 define a capacitive detection zone 116 illustrated in dotted lines in the. The dielectric 161 has the function of obtaining a segmentation of the capacitive detection zone 116 into several detection zones 16.1 for the detection of a finger. The electrodes 162 make it possible to transfer a signal to an electronic control unit ECU of the vehicle via electrical wires 163 which connect them to said electronic control unit ECU as illustrated in the.

[0069] In a first non-limiting embodiment, the capacitive detection means 16 are printed on the light guide sheet 11. The light guide sheet 11 is used as a printing substrate. Subsequently, the assembly can be overmolded with the inner element 8.

[0070] In a second non-limiting embodiment, the capacitive detection means 16 are in the form of a capacitive film bonded to the light guide sheet 11. The capacitive film is denoted capacitive film 16. In a non-limiting embodiment, the capacitive film 16 has dimensions smaller than those of the light guide sheet 11. In a non-limiting embodiment, the thickness of the capacitive film is approximately 50 micrometers. In a first non-limiting variant embodiment, a decorated bezel (otherwise called a decorative mask) is arranged above the light guide sheet 11. The decorated bezel comprises a decorative support, for example made of transparent plastic, and a decoration (made of plastic with a pattern, translucent wood, leather, etc.). In this example, the capacitive detection means 16 are arranged between the light guide sheet 11 and the decorated bezel. The decorated bezel is part of the interior element 8.In a second non-limiting variant embodiment, in the absence of a decorated bezel arranged above the light guide sheet 11, the capacitive film is glued to the back of the light guide sheet 11.

[0071] The capacitive film 16 is transparent or non-transparent.

[0072] In a non-limiting embodiment, when the capacitive film 16 is transparent, the light pattern 1110 can be arranged opposite the capacitive detection zone 116. We thus have the light pattern 1110 which is illuminated and on which the capacitive detection zone 116 is superimposed, namely the capacitive function.

[0073] In a non-limiting embodiment, when the capacitive film 16 is non-transparent, the light pattern 1110 can be arranged in the immediate vicinity of the capacitive detection zone 116. This results in the light pattern 1110 being illuminated and being offset from the capacitive detection zone 116, namely the capacitive function. It will be noted that a non-transparent capacitive film 16 is less expensive than a transparent capacitive film. When there is a decorated bezel, the decorated bezel may have an opaque portion to hide the capacitive film 16 (which represents a technical portion) and a transparent portion at the light-emitting zone 111 to allow light to pass through.

[0074] In the two non-limiting embodiments, the light emission zones 111 are thus obtained at the same level as the capacitive function.

[0075] When a user's finger touches the light pattern 1110, thanks to the capacitive detection means 16, a signal is sent to the electronic control unit ECU of the vehicle which triggers a function. In non-limiting embodiments, the function is an adjustment (increase / decrease) of the volume of the radio, the temperature in the passenger compartment of the vehicle, the air conditioning, or a change of radio stations, etc.

[0076] Figures 8 and 9 illustrate a light pattern 1110 which is arranged opposite the capacitive detection means 16. The superposition of the light pattern 1110 and the capacitive detection means 16 makes it possible to have a capacitive detection zone 116 (illustrated in dotted lines) which covers said light pattern 1110. The capacitive detection means 16 are in this case transparent. Thus, by moving the finger over this light pattern 1110, there will be a signal sent to the electronic control unit ECU to carry out the desired function associated with the light pattern 1110. In the non-limiting example of the, the light pattern 1110 is a two-way arrow bar. Thus, by moving the finger over this light pattern 1110, there will be in a non-limiting example an increase / decrease in the air conditioning of the vehicle. In the non-limiting example of the, the light pattern 1110 is a series of cloud-shaped pictograms. It will be noted that a detection zone 16.1 described above may correspond to one or more pictograms. As can be seen in these two figures, the capacitive detection means 16 are superimposed on the light pattern 1110.

[0077] Figures 10 and 11 illustrate a light pattern 1110 which is arranged in the immediate vicinity of the capacitive detection means 16. The proximity of the capacitive detection means 16 to the light pattern 1110 makes it possible to have a capacitive detection zone 116 (illustrated in dotted lines) which covers said light pattern 1110. Thus, by moving the finger over this light pattern 1110, a signal will be sent to the electronic control unit ECU to carry out the desired function associated with the light pattern 1110. In the non-limiting example of the, the light pattern 1110 is a two-way arrow bar. In the non-limiting example of the, the light pattern 1110 is a series of cloud-shaped pictograms.

[0078] For the sake of simplification, the light emitting region 111 has not been illustrated in FIGS. 8 to 11.

[0079] Of course, the description of the invention is not limited to the embodiments described above or to the field described above. Thus, in another non-limiting embodiment, the lighting device 2 is a lighting and / or signaling device. In non-limiting embodiments, the lighting and / or signaling device is a headlight or a rear light.

[0080] Thus, the invention can be applied to any application other than the vehicle application, such as an application in the field of aviation, railways, for example for lighting a pattern in an airplane cockpit or a train cabin. It can also be applied to applications in the field of advertising on billboards or on storefronts or in buildings. It can also be applied to applications in the field of toys, decoration, or multimedia.

[0081] Thus, the invention described has in particular the following advantages: thanks to the integration of the human-machine interface(s) 25 at the same level as the light guide sheet 11 of the light guide 1, it makes it possible to reduce the space used in comparison with a solution where the human-machine interface 25 is arranged next to the light guide 1, thanks to the integration of one or more human-machine interfaces 25 (in the form of buttons for example or capacitive detection zone) in the light guide 1, it makes it possible to have a more compact solution in comparison with a solution where the human-machine interface 25 is arranged next to the light guide 1; thus the assembly is integrated more easily on a smaller surface. For example, it is possible to have a more compact vehicle dashboard which integrates both a human-machine interface 25 which integrates the capacitive function, a human-machine interface 25 such as a button, and the illumination function.

Claims

Surface light guide (1) for a vehicle, said light guide (1) comprising at least one group (10) of light injection elements (100) and a light guide sheet (11), said group (10) being intended to be coupled with at least one light source (20), characterized in that said light guide sheet (11) comprises: at least one light emission zone (111), and at least one zone (115, 116) configured to provide a physical human-machine interface (25). Light guide (1) according to claim 1, wherein said human-machine physical interface (25) is a rotary knob, or a window regulator, or a push button. Light guide (1) according to any one of the preceding claims, wherein said light guide (1) comprises capacitive detection means (16) which define a capacitive detection zone (116) in the light guide sheet (11) to provide the physical human-machine interface (25). Light guide (1) according to claim 3, wherein the light emitting zone (111) comprises a light pattern and wherein the capacitive detection means (16) are arranged opposite or in the immediate vicinity of said capacitive detection means. Light guide (1) according to claim 1, according to which the light guide sheet (11) comprises: a cutting zone (115) dedicated to a physical human-machine interface of the rotary button, or window regulator, or push button type, called mechanical interface; a capacitive detection zone (116) where capacitive detection means (16) are arranged, called capacitive interface; and a light pattern (1110), said capacitive detection means (16) being arranged opposite or in the immediate vicinity of said capacitive detection means. Light guide (1) according to the preceding claim, wherein:the light guide comprises a plurality of light emitting zones each comprising a light pattern to have several light patterns; andamong said several light patterns, one light pattern (1110) is associated with the capacitive detection means and the remaining light patterns provide a decorative function. Light guide (1) according to one of claims 3 to 6, wherein said capacitive detection means (16) comprise at least one antenna (160), at least one dielectric (161) and a plurality of electrodes (162). Light guide (1) according to one of claims 3 to 7, wherein said capacitive detection means (16) are printed on said light guide sheet (11). Light guide (1) according to one of claims 3 to 7, according to which said capacitive detection means (16) are in the form of a film glued onto said light guide sheet (11). Light guide (1) according to the preceding claim, wherein said film is transparent or non-transparent. Light guide (1) according to one of claims 3 to 10, wherein said light guide further comprises a decorative mask configured to mask said capacitive detection means (16). Luminous device (2) for a vehicle, said luminous device (2) comprising at least one light guide (1) according to any one of the preceding claims and at least one associated light source (20). Interior element (8) for a vehicle comprising at least one light guide (1) according to any one of the preceding claims 1 to 11 and at least one associated light source (20).

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