FR3104079A1 - Motor vehicle interface and mounting method - Google Patents

Abstract

Interface (1) for controlling at least one function of a motor vehicle component, comprising a movable part (2) comprising a capacitive touch surface (3), a fixed part (4) intended to be fixed to the motor vehicle , at least one damping element (5) interposed between the movable part (2) and the fixed part (4) to connect the movable part (2) to the fixed part (4), at least one capacitive support sensor (6 ) comprising a movable electrode (16; 31) carried by the movable part (2) and a fixed electrode (22) carried by the fixed part (4), at least one insulating spacer (23) interposed between the fixed electrode (22 ) and the movable electrode (16; 31), the movable electrode (16; 31) comprising a holding device (25) cooperating with an axis (24) of the movable part (2) to assemble the movable electrode ( 16; 31) on the axis (24) after pushing the movable electrode (16; 31) along the axis (24) in abutment against the insulating spacer (23). Abstract figure: Figure 2

Description

Automotive vehicle interface and mounting method

The present invention relates to an interface for controlling at least one function of a motor vehicle component. The invention also relates to a method for mounting such an interface.

In the automotive field, touch screens are commonly used to control electrical or electronic systems, such as an air conditioning system, an audio system or even a navigation system. These touch screens comprise capacitive touch screens making it possible to detect an interaction with a user. However, these tiles do not detect the support force with which the user presses on the surface. This information can be useful in some cases to better interpret user commands.

To measure the pressing force exerted, it is known to measure the deformation of an elastic mechanical part whose stiffness is known. The elastic deformation allows the bringing together of two measuring elements, such as the bringing together of two electrodes in the case of a capacitive measurement or like the bringing together of an inductance and a core in the case of an inductive measurement.

In the case of a capacitive measurement, the measurement sensitivity changes according to the distance between the two electrodes. The sensitivity (minimum variation that can be measured) is lower when the distance between the electrodes increases. To benefit, on the contrary, from a higher sensitivity for weaker forces, another architecture is known which consists in measuring the gap between electrodes “in the distance” rather than in “approach”.

The mobile electrode is carried by a fixing screw passing through a shock absorber as well as an electronic card carrying the fixed electrode. At least one spacer surrounding the screw makes it possible to ensure spacing between the two electrodes by forming a stop for tightening the fixing screw when assembling the interface. With this arrangement, pressure exerted by the user on the interface moves the mobile electrode away from the fixed electrode, which makes it possible to obtain an accurate measurement for small efforts.

A drawback of this solution is the difficulty of adjusting the spacing between electrodes defining the initial capacitance at rest when assembling the interface. Indeed, to precisely adjust this spacing, it is necessary to precisely control the tightening of the screw carrying the mobile electrode. Tightening too lightly can leave too large a gap between the electrodes and tightening too hard can compress the spacer, shifting the initial capacitance from the optimum range of the sensor. This fine adjustment of the tightening of the screw is therefore quite difficult to achieve with the required precision. Knowing in addition that an interface generally includes at least four capacitive sensors, the overall assembly of the interface can be particularly long to achieve and therefore relatively expensive.

Another disadvantage of this architecture is that the capacitive sensors arranged in the same axis as the damper, can penalize the overall thickness of the interface.

One of the aims of the present invention is therefore to propose an improved interface which at least partly solves one of the drawbacks of the state of the art.

To this end, the subject of the invention is an interface for controlling at least one function of a motor vehicle component, comprising:
- a mobile part comprising a capacitive touch surface,
- a fixed part intended to be fixed to the motor vehicle,
- at least one damping element interposed between the mobile part and the fixed part to connect the mobile part to the fixed part,
- at least one capacitive support sensor comprising a movable electrode carried by the movable part and a fixed electrode carried by the fixed part, the fixed electrode being arranged facing the movable electrode to measure a variation in distance between the part mobile and the fixed part representative of a pressure force exerted on the capacitive touch surface, the fixed electrode being placed between the mobile electrode and the capacitive touch surface so that a pressure exerted on the capacitive touch surface moves the mobile electrode of the fixed electrode,
characterized in that:
- the capacitive support sensor comprises at least one insulating spacer interposed between the fixed electrode and the mobile electrode,
- the movable electrode comprises a holding device cooperating with an axis of the movable part to assemble the movable electrode on the axis after pushing the movable electrode along the axis into abutment against the insulating spacer.

The assembly is complete when the mobile electrode pushed along the axis comes into abutment against the insulating spacer. It is therefore not necessary to adjust the tightening of the screw as in the prior art to guarantee the spacing between the electrodes. The assembly of the mobile electrode facing the fixed electrode can therefore be carried out without screws. Assembly is therefore simplified. The gap between the electrodes is controlled by the insulating spacer which ensures a constant gap between the electrodes regardless of the tolerances of the interface parts. The distance between the electrodes can be precise enough with the insulating spacers to avoid calibrating the sensors on the assembly line. In addition, the capacitive support sensor is separated from the damping elements, which makes it possible to limit the thickness of the interface.

The interface may also include one or more of the characteristics which are described below, taken alone or in combination.

The mobile electrode can be a metal washer.

The assembly of the mobile electrode on the axis can be irreversible, that is to say that the device for holding the mobile electrode can allow the axial insertion of the mobile electrode along the axis in the direction of assembly but block the movement of the mobile electrode in the other direction. Once the mobile electrode is inserted, it can no longer be removed without difficulty.

The device for holding the movable electrode may comprise at least one flexible tongue projecting radially from a central orifice of the movable electrode, the flexible tongue being deformed when the movable electrode is force-fitted along the axis . This deformation of the flexible tabs makes it difficult to disassemble the mobile electrode. When deformed, the edges of the flexible tabs press against the axis and prevent the movable electrode from moving along the axis in the opposite direction to the direction of assembly. The clamping and holding of the mobile electrode on the axis are thus ensured by the deformation of the flexible tabs, the edges of which continuously exert pressure on the axis of the mobile part.

The device for holding the mobile electrode can also comprise at least one centering tab, projecting radially from the central orifice to center the washer on the shaft. Once assembled, the mobile electrode is centered on the axis perpendicular to the axis thanks to the centering tabs and it is maintained on the axis thanks to the deformation of the flexible tabs.

According to another exemplary embodiment, the holding device is configured to hold the mobile electrode on the axis by friction. For example, the diameter of the center hole of the movable electrode washer is just a little larger than the diameter of the shaft. During assembly, the washer can be pushed along the axis by a force exerted by an operator. Once released and in abutment against the insulating spacer, the friction force of the washer on the axle is sufficient to prevent the washer from sliding on the axle under the effect of its own weight or under the effect of vibrations .

The mobile electrode and the holding device can be made in one piece.

The axis and the support of the mobile part bearing the capacitive touch surface can be metallic. In this case, mounting the mobile electrode on the shaft also ensures electrical contact between the mobile electrode and the support, making it possible to easily connect the mobile electrode to ground.

The insulating spacer may be an insulating washer.

The fixed electrode can be embedded in an electronic card of the fixed part, the insulating spacer being formed by a portion of the electronic card interposed between the fixed electrode and the mobile electrode. This embodiment makes it possible to reduce the number of parts. It is therefore less expensive.

The fixed electrode of the capacitive pressure sensor can be carried by a rear face of the electronic card, the electronic card carrying electrical circuits on the front face, in particular for managing the capacitive touch surface.

The mobile part may comprise a display screen arranged at the rear of the capacitive touch surface.

The invention also relates to a method for mounting an interface as described above, in which:
- a support for a mobile part bearing a capacitive touch surface is placed on a mounting support, the capacitive touch surface being flat against the mounting support,
- a frame of a fixed part is fixed to the support by interposing at least one damping element between the mobile part and the fixed part and by causing at least one fixed electrode of the fixed part to pass through an axis of the mobile part,
- at least one insulating spacer is inserted around the axis until it comes into abutment against the fixed electrode,
- A movable electrode is pushed along the axis until the movable electrode comes into abutment against the insulating spacer.

Other characteristics and advantages of the invention will emerge from the following description, given by way of example, without limitation, with reference to the appended drawings in which:

FIG. 1 represents a view of a portion of the interior passenger compartment of a motor vehicle comprising an interface which is installed by way of example at the level of the dashboard of the vehicle.

Figure 2 shows a schematic cross-sectional view of part of the elements of a first embodiment of the interface of Figure 1.

Figure 3 is a view of a detail of the interface of Figure 2, in the absence of support on the interface.

FIG. 4 is a view similar to FIG. 3 when pressure is exerted on the interface.

Figure 5 is a perspective view of a movable electrode of the interface of Figure 1.

FIG. 6a shows a first step in a method for mounting the interface.

Figure 6b shows a second step of the mounting method.

Figure 6c shows a third step of the assembly process.

Figure 6d shows a fourth step of the assembly process.

Figure 7 is a view similar to Figure 3 for a second embodiment of the interface, in the absence of support on the interface.

FIG. 8 is a view similar to FIG. 7 when pressure is exerted on the interface.

Figure 9 is a view similar to Figure 5 for a second embodiment of the movable electrode.

Figure 10 is a radial CC sectional view of the mobile electrode of Figure 9 assembled on an axis of the mobile part of the interface.

In these figures, identical elements bear the same reference numbers.

The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference is to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.

Figure 1 shows elements of a front part of a motor vehicle cabin.

The passenger compartment comprises in particular a driver's seat denoted -C- arranged behind a steering wheel 60 and a dashboard 61, a passenger seat denoted -P-, an interior rear-view mirror 62, a ceiling light module 63 also called a dome placed near the rear-view mirror interior 62 in the upper central part of the front part of the cabin and a central console 64 located between the two seats C, P of the front part of the cabin.

The passenger compartment further comprises an interface 1 in particular adapted to be housed in the dashboard 61 of the vehicle. Of course, interface 1 can also be placed in other places in the passenger compartment.

Such an interface 1 allows the control of at least one function of a motor vehicle component such as the control of the functions of an air conditioning system, an audio system, a telephone system or even a navigation system. This interface 1 can also be used for window lift controls, for positioning exterior mirrors or even for moving motorized seats or for controlling interior lights, central locking, a sunroof, hazard warning lights or dash lights. 'atmosphere.

Interface 1 allows the user, for example, to select by scrolling through a list or to modify a parameter value or to validate a selection. It allows the user, for example, to select a destination postal address or a name in a directory, the settings of the air conditioning system or the selection of a musical track from a list.

Figure 2 shows a schematic cross-sectional view of Interface 1.

The interface 1 comprises a mobile part 2 comprising a capacitive touch surface 3, a fixed part 4 intended to be fixed to the motor vehicle, at least one damping element 5 interposed between the mobile part 2 and the fixed part 4 to connect the mobile part 2 to the fixed part 4, and at least one capacitive pressure sensor 6 configured to measure a parameter representative of a pressure force exerted on the capacitive touch surface 3.

By "interposed", it is meant that the mobile part 2 and the fixed part 4 are not directly in contact, but are connected via one or more damping elements 5. The damping element 5 which connects the mobile part 2 of the interface 1 to the fixed part 4 comprises at least one elastic element 7, such as an elastic, silicone or rubber pad working in compression. The elastic element 7 is for example in one piece and has for example a substantially cylindrical general shape having an axial orifice for the passage of a fixing member 8. The fixing member 8 is for example a screw whose The threaded end is screwed into a support 11 of the movable part 2 and against which the elastic element 7 of the damping element 5 abuts. The interface 1 comprises for example four damping elements 5 of the “silentblock®” type. The damping element 5 makes it possible in particular to limit the movement of the mobile part 2 towards the fixed part 4 when pressure is exerted on the capacitive touch surface 3.

The capacitive touch surface 3 comprises for example at least one capacitive sensor and a front plate, such as a glass or plastic plate, ensuring the rigidity of the capacitive touch surface. The front plate is arranged on the at least one capacitive sensor and faces the user once mounted in the passenger compartment. The front plate can be flat or curved and can be at least partially transparent and/or at least partially opaque so as to hide the elements arranged behind.

The capacitive sensor makes it possible to detect a variation in capacitance at the level of the surface of the front plate. The capacitive sensor can for example detect a contact or a movement of a finger of a user. The capacitive sensor also makes it possible to determine the spatial coordinates of the contact.

According to a first example, the interface is of the “control panel” type. The front plate is opaque and the mobile part 2 comprises one or more capacitive sensors arranged at a distance from each other, forming one or more contact zones, reproducing for example keyboard keys or cursors.

According to a second example, the interface is of the “touchpad” type (also called “TouchPad” in English). The front plate is opaque and the mobile part 2 comprises a capacitive sensor of the capacitive touch screen type, for example in particular capable of performing handwriting recognition.

According to a third example, the interface 1 is of the “touch screen” type. In this case, the mobile part 2 comprises a display screen arranged at the rear of the capacitive sensor of the capacitive touch screen type, the front plate being at least partially transparent.

The capacitive sensor is fixed to the front plate for example by an optical adhesive (called “optical bounding”). The capacitive sensor is for example formed of a network of electrodes extending over all or part of the rear surface of the front plate. The electrodes are for example made of ITO (indium tin oxide) which allows the capacitive sensor to be transparent.

The display screen, such as a TFT (Thin-Film transistor) screen or an LED screen or an LCD screen can be configured to display information associated with the manipulation of the interface 1. screen is arranged under the capacitive sensor so as to form a touch screen. The display screen can be fixed to the capacitive sensor by an optical glue. The capacitive sensor, the optical glue and the front plate are at least partially transparent to allow viewing of the images displayed by the screen.

The support 11 of the mobile part 2 carries the capacitive touch surface 3 and the display screen if applicable. The support 11, for example in the form of a frame and for example metallic, is for example fixed to the rear of the front plate, at the level of an opaque surface around the capacitive sensor.

The interface 1 can also include at least one vibratory actuator configured to make the mobile part 2 vibrate in response to a contact, a displacement or a pressure exerted on the capacitive touch surface 3 in order to provide haptic feedback to the user in particular for inform him of the taking into account of his order.

The fixed part 4 comprises an electronic card 13 and a box 14 comprising for example a chassis 14a and a base 14b whose bottom makes it possible to close the interface 1. The electronic card 13, for example of the PCB type in English for "Printed Circuit Board”, bears in particular electrical circuits for managing the capacitive touch surface 3 and the display screen if applicable. The frame 14a has for example a frame shape, the frame 14a and the base 14b being assembled for example by means of screws 15.

The elastic element 7 of the damping element 5 has for example a central annular clearance allowing the elastic element 7 to be retained in a respective orifice of the frame 14a. The elastic elements 7 can be inserted into the openings of the frame 14a by deformation or can be overmolded in a respective opening.

The at least one capacitive bearing sensor 6 comprises a mobile electrode 16 carried by the mobile part 2 and a fixed electrode 22 carried by the fixed part 4, the fixed electrode 22 being arranged facing the mobile electrode 16 to measure a variation in distance “d” between the mobile part 2 and the fixed part 4 in a direction perpendicular to the capacitive touch surface 3 representing a pressing force exerted on the capacitive touch surface 3 (FIG. 4).

The fixed electrode 22 and the mobile electrode 16 have conductive metal surfaces or are made of conductive material, in particular metal.

The fixed electrode 22 is for example carried by the electronic card 13 of the fixed part 4. It is for example printed on the electronic card 13 like the electric tracks of the circuits of the card 13. The fixed electrode 22 of the capacitive sensor d support 6 is for example carried by a rear face of the electronic card 13 carrying the electric circuits in particular for the management of the capacitive touch surface 3, on the front face. By using a single common electronic card 13 for managing the capacitive touch surface 3, the display screen 9 and the capacitive support sensor 6, the use of additional electronic cards for the capacitive sensors of support, which makes it possible to reduce the number of components of the interface 1, facilitates its assembly and lowers costs.

The fixed electrode 22 is arranged between the mobile electrode 16 and the capacitive touch surface 3 so that a pressure exerted on the capacitive touch surface 3 moves the mobile electrode 16 away from the fixed electrode 22. With this configuration, the distance “d” increases when the effort increases. This configuration provides good sensitivity for low force values.

The capacitive bearing sensor 6 further comprises an insulating spacer 23 interposed between the fixed electrode 22 and the mobile electrode 16. The insulating spacer 23 is for example placed on the fixed electrode 22 of the fixed part 4. In rest position, when no pressure is exerted on the capacitive touch surface 3, the mobile 16 and fixed 22 electrodes are separated by the insulating spacer 23 (FIG. 3).

In this first embodiment, the insulating spacer 23 is produced by an insulating washer which is an element distinct from the other elements of the interface 1. The material of this insulating spacer 23 is electrically insulating. It comprises for example a thermoplastic polymer such as a PMMA material.

The mobile electrode 16 comprises a holding device 25 cooperating with a shaft 24 of the mobile part 2 to assemble the mobile electrode 16 on the shaft 24 after pushing the mobile electrode 16 along the shaft 24 against the insulating spacer 23.

The assembly of the mobile electrode 16 on the axis 24 can be irreversible, that is to say that the device for holding the mobile electrode 16 can allow the axial insertion of the mobile electrode 16 along of the axis 24 in the direction of assembly (arrow 28 in FIG. 6d) but block the movement of the movable electrode 16 in the other direction. Once the movable electrode 16 has been inserted, it cannot be removed without difficulty.

There are for example at least three capacitive support sensors 6, for example four, each comprising a movable electrode 16 carried by the movable part 2 and a fixed electrode 22 carried by the fixed part 4, as many insulating spacers 23 interposed between the fixed 22 and mobile 16 electrodes and as many axes 24 of the mobile part 2.

Shaft 24, for example, is made in one piece with support 11 of mobile part 2. The direction of shaft 24 is perpendicular to the plane of capacitive touch surface 3.

The mobile electrode 16 is for example fixed to one end of the axis 24.

The fixed electrode 22 and the mobile electrode 16 of at least one capacitive support sensor 6 can surround the axis 24 of the mobile part 2.

For this, the fixed electrode 22 and the mobile electrode 16 have, for example, annular shapes. The movable electrode 16 is for example a metal washer, such as steel. The surface of the metal disc is arranged parallel to and facing the surface of the fixed electrode 22.

The holding device 25 of the movable electrode 16 in the form of a washer comprises for example at least one flexible tongue 26 projecting radially from a central orifice 27 of the movable electrode 16 (FIG. 5).

The holding device 25 comprises for example between three and eight flexible tabs 26 (here six diametrically opposed) regularly distributed.

The mobile electrode 16 and the holding device 25 are for example in one piece, for example metallic (FIG. 5). The flexible tongues 26 are for example obtained by cutting out the washer.

The flexible tongue 26 is deformed by the force fitting of the mobile electrode 16 along the axis 24 through the central hole 27 of the washer. After assembly, the flexible tongues 26 are deformed against the axis 24 in the direction of insertion of the axis 24. More precisely, the deformed flexible tongues 26 extend along the axis 24 on the side of the end of the shaft 24 inserted first through the central hole 27 of the mobile electrode 16. This deformation of the flexible tabs 26 makes it difficult to disassemble the mobile electrode 16. When they are deformed, the edges 29 of the flexible tongues 26 press against the axis 24 and prevent the movable electrode 16 from moving along the axis 24 in the opposite direction to the direction of assembly (arrow 28). The clamping and holding of the movable electrode 16 on the pin 24 are thus ensured by the deformation of the flexible tabs 26 whose edges 29 continuously exert pressure on the pin 24 of the movable part 2.

In the case of a pin 24 and a metal support 11, the mounting of the movable electrode 16 on the pin 24 also ensures electrical contact between the movable electrode 16 and the support 11, making it possible to connect the movable electrode 16 to ground 30.

The method for mounting the interface 100 comprises for example the following succession of steps (FIGS. 6a, 6b, 6c, 6d).

The support 11 of the mobile part 2 bearing the capacitive touch surface 3 is placed on a mounting support 19 (FIG. 6a). Interface 1 is then turned over so that the capacitive touch surface 3 of interface 1 is flat against the mounting bracket 19.

The frame 14a of the fixed part 4 is fixed to the support 11 by interposing the at least one damping element 5 between the mobile part 2 and the fixed part 4 and by causing the at least one fixed electrode 22 of the fixed part 4 to cross by a axis 24 of the mobile part 2 (FIG. 6b).

Then, at least one insulating spacer 23 is inserted around the axis 24 until it comes into abutment against the fixed electrode 22 (FIG. 6c).

Then, the movable electrode 16 is pushed along the axis 24 until it comes into abutment against the insulating spacer 23 (FIG. 6d).

The mobile electrode 16 thus pushed into abutment along the axis 24 allows assembly by simply pressing the mobile electrode 16 onto the axis 24 of the mobile part 2 resting on the assembly support 19. The assembly is finished when the movable electrode 16 comes into abutment against the insulating spacer 23. It is not necessary to adjust the tightening of the screw as in the prior art to guarantee the spacing between the electrodes. The assembly of the movable electrode 6 facing the fixed electrode 22 can therefore be made without screws. Assembly is therefore simplified. The gap between the electrodes 16, 22 is controlled by the insulating spacer 23 which ensures a constant gap between the electrodes 16, 22 whatever the tolerances of the parts of the interface 1. The distance between the electrodes 16, 22 can be sufficiently precise with the insulating spacers 23 to dispense with a calibration of the sensors on the assembly line. In addition, the capacitive support sensor 6 is separated from the damping elements 5, which makes it possible to limit the thickness of the interface 1.

A processing unit comprising one or more microcontrollers or computers or processors, having suitable memories and programs can be connected to the capacitive support sensors 6 and to the capacitive touch surface 3. This is for example the on-board computer of the vehicle automobile.

In operation, when the user 17 presses with effort on the capacitive touch surface 3, the mobile part 2 is depressed (the direction of movement is represented by the arrow 18 in FIG. 4) and moves a distance "d" relative to the fixed part 4, moving the movable electrode 16 away from the fixed electrode 22 carried by the electronic card 13.

The capacitive support sensor 6 detects the movement of the mobile part 2 towards the fixed part 4, representative of a support force. The measurement of the distance “d” and the calibrated value of the suspension make it possible to deduce the value of the force applied.

The measurement of the pressing force can make it possible to control at least one function of the interface 1, for example only when a pressing force exerted on the capacitive touch surface 3 is greater than a threshold. The function of the interface 1 can be controlled relative to the intensity of the pressing force exerted on the capacitive touch surface 3.

Figures 7 and 8 show a second embodiment.

In this example, the fixed electrode 22 is embedded in the electronic card 13 of the fixed part 4. The surface of the fixed electrode 22 is parallel to the rear and front faces of the electronic card 13.

The insulating spacer 23 is thus formed by a portion of the electronic card 13 interposed between the fixed electrode 22 and the mobile electrode 16, sandwiched by the electrodes 16, 22 in the rest position (FIG. 7).

In operation, when the capacitive touch surface 3 is pressed with force, the mobile part 2 is depressed (the direction of movement is represented by the arrow 18 in FIG. 8) and moves a distance "d" by relative to the fixed part 4, moving the movable electrode 16 away from the fixed electrode 22 carried by the electronic card 13.

This embodiment does not reduce the number of parts compared to the first embodiment by removing the insulating washer. It is therefore less expensive.

Figures 9 and 10 show a second embodiment of mobile electrode 31.

In this embodiment, the holding device 25 of the mobile electrode 31 in the form of a washer also comprises at least one centering tab 32 projecting radially from the central orifice 27 of the mobile electrode 16, to center the washer. on axis 24.

Before deformation of the flexible tongues 26, the diameter in which the ends of the centering tongues 32 fit is greater than that in which the ends of the flexible tongues 26 fit, which are therefore radially longer (FIG. 9).

The holding device 25 comprises for example between three and four flexible tabs 26 and between three and four centering tabs 32 regularly distributed and arranged alternately.

The flexible tongues 26 and the centering tongues 32 are for example made by cutting out the washer.

These centering tabs 32 do not prevent the washer from sliding along the axis 24 in one direction or the other, but allow its centering on the axis 24, perpendicular to the axis 24.

Once mounted on the axis 24, the mobile electrode 31 is centered on the axis 24 perpendicular to the axis 24 thanks to the centering tongues 32 and it is maintained on the axis 24 thanks to the deformation of the flexible tongues 26 .

Claims (12)

Interface (1) for controlling at least one function of a motor vehicle component, comprising:
- a mobile part (2) comprising a capacitive touch surface (3),
- a fixed part (4) intended to be fixed to the motor vehicle,
- at least one damping element (5) interposed between the mobile part (2) and the fixed part (4) to connect the mobile part (2) to the fixed part (4),
- at least one capacitive pressure sensor (6) comprising a movable electrode (16; 31) carried by the movable part (2) and a fixed electrode (22) carried by the fixed part (4), the fixed electrode ( 22) being arranged opposite the movable electrode (16; 31) to measure a variation in distance (d) between the movable part (2) and the fixed part (4) representative of a bearing force exerted on the capacitive touch surface (3), the fixed electrode (22) being arranged between the movable electrode (16; 31) and the capacitive touch surface (3) so that pressing on the capacitive touch surface (3) moves the mobile electrode (16; 31) of the fixed electrode (22),
characterized in that:
- the capacitive support sensor (6) comprises at least one insulating spacer (23) interposed between the fixed electrode (22) and the mobile electrode (16; 31),
- the mobile electrode (16; 31) comprises a holding device (25) cooperating with a shaft (24) of the mobile part (2) to assemble the mobile electrode (16; 31) on the shaft (24) after pushing the movable electrode (16; 31) along the axis (24) into abutment against the insulating spacer (23). Interface (1) according to the preceding claim, characterized in that the holding device (25) is configured to irreversibly assemble the mobile electrode (16; 31) on the shaft (24). Interface (1) according to one of the preceding claims, characterized in that the movable electrode (16; 31) is a metal washer. Interface (1) according to Claim 3, characterized in that the device for holding (25) the movable electrode (16; 31) comprises at least one flexible tongue (26), projecting radially from a central orifice (27) of the movable electrode (16; 31), the flexible tab (26) being deformed on force fitting of the movable electrode (16; 31) along the axis (24). Interface (1) according to claim 4, characterized in that the holding device (25) of the movable electrode (31) further comprises at least one centering tongue (32), projecting radially from the central orifice (27 ) to center the washer on the shaft (24). Interface (1) according to one of the preceding claims, characterized in that the mobile electrode (16; 31) and the holding device (25) are in one piece. Interface (1) according to Claims 3 and 6, characterized in that the axis (24) and the support (11) of the movable part (2) bearing the capacitive touch surface (3) are metallic. Interface (1) according to one of the preceding claims, characterized in that the insulating spacer (23) is an insulating washer. Interface (1) according to one of Claims 1 to 7, characterized in that the fixed electrode (22) is embedded in an electronic card (13) of the fixed part (4), the insulating spacer (23) being formed by a portion of the electronic card (13) interposed between the fixed electrode (22) and the mobile electrode (16; 31). Interface (1) according to one of the preceding claims, characterized in that the fixed electrode (22) of the capacitive pressure sensor (6) is carried by a rear face of the electronic card (13), the electronic card ( 13) carrying electrical circuits on the front face, in particular for managing the capacitive touch surface (3). Interface (1) according to one of the preceding claims, characterized in that the mobile part (2) comprises a display screen arranged behind the capacitive touch surface (3). Method for mounting an interface (100) according to one of the preceding claims, in which
- a support (11) of a mobile part (2) carrying a capacitive touch surface (3) is placed on a mounting support (19), the capacitive touch surface (3) being flat against the mounting support (19 ),
- a frame (14a) of a fixed part (4) is fixed to the support (11) by interposing at least one damping element (5) between the movable part (2) and the fixed part (4) and by causing the at least one fixed electrode (22) of the fixed part (4) by an axis (24) of the movable part (2),
- at least one insulating spacer (23) is inserted around the axis (24) until it comes into abutment against the fixed electrode (22),
- a mobile electrode (16; 31) is pushed along the axis (24) until the mobile electrode (16; 31) comes into abutment against the insulating spacer (23).