Device and keyboard for detecting key operation and / or operating travel of a key module

Abstract

The utility model relates to a device and keyboard for detecting the key operation and / or operation stroke of key module. The device comprises: a circuit substrate; a coil arranged on or in the circuit substrate; a key module mounted on the circuit substrate, having a housing, a movement mechanism comprising a push rod and a return spring, and a damping element, the push rod moving between a rest position and an operating position, the damping element being arranged such that its movement causes a change in the inductance of the coil and / or a change in a physical variable, the movement of the damping element being initiated by the movement of the push rod, the movement of the push rod from the rest position to the operating position causing a change in the inductance of the coil and / or a change in the physical variable, the device outputting an electrical signal for signaling the key operation and / or operation stroke of the key module. The damping element is supported on the housing and / or the circuit substrate, the movement of the damping element relative to the housing being a rotational movement or a linear movement parallel to the circuit substrate, the rotational movement or linear movement of the damping element being different from the movement of the push rod.

Description

Technical Field

[0001] This utility model relates to a device for detecting key operations and / or operating strokes of a key module, and a keyboard including one or more such devices. The key module is a core component of the keyboard. Background Technology

[0002] Inductive button modules are known. These modules have a damping element that approaches a planar coil when the button is pressed. The resulting change in inductance is detected and signaled as the button's operation.

[0003] Such button modules are known from DE 10 2020 127 246 A1, DE 10 2020 132 195 A1, DE 10 2020 132 198 A1, DE 10 2021 116 021A1, DE 10 2020 132 196A1, DE 10 2015 120 607A1, DE10 2015 204 440A1 and US2010 / 0320066 A1.

[0004] A known drawback of the button module is that the damping element is fixed to the push rod. While the implementation is very simple, it introduces three main disadvantages:

[0005] 1. The damping element is directly connected to the push rod, which serves as the operating component, and therefore travels the same distance as the push rod. This distance is typically 3mm to 4mm. Due to limited available installation space, the magnetic field of the coil is relatively flat. Therefore, in the rest position, the damping element is partially or completely positioned outside the magnetic field. Consequently, the magnetic field coupling between the planar coil and the damping element is significantly absent or weakened in the rest position region. This makes the detection of signal changes inaccurate, and sometimes even undetectable.

[0006] 2. The magnetic field strength of the coil decreases disproportionately and therefore non-linearly with increasing distance from the coil or the printed circuit board containing the coil. Because the push rod and damping element move linearly toward or away from the coil, the damping effect on the coil is significantly non-linear. This results in a highly non-uniform inductance travel curve. When the damping element moves from its rest position toward the coil, accurate signal detection is limited in the first half of the travel. When the damping element moves away from the coil from its rest position, signal detection deteriorates in the second half of the travel. In both cases, linear signal travel detection is absent. While linearity can be improved by converting the count during signal evaluation, this introduces inaccuracies in the switching travel and / or increases the cost of the final product.

[0007] Keyboards based on Hall sensors, capacitive sensors, and optical sensors also have similar problems.

[0008] 3. The implementation of button modules with linear force-stroke characteristics is known. However, the implementation of tactile button modules (with tactile force-stroke curves) or click button modules (with tactile and auditory feedback) has so far been quite complex and / or can only be achieved with the aid of additional mechanisms. A fixed connection between the tactile point or click tactile point and the electrical switching point is impossible, or at least highly dependent on tolerances. Utility Model Content

[0009] Therefore, the object of this invention is to provide a new device for detecting key operations and / or operating strokes of a key module, particularly a device that at least partially overcomes the aforementioned disadvantages. Furthermore, a keyboard comprising one or more such devices will also be provided.

[0010] This objective is achieved, in terms of the device, by a device having the features described below, and in terms of the keyboard, by a keyboard having the features described below. Advantageous designs and improvements are given below.

[0011] The device for detecting key operation and / or operation stroke of a key module according to the present invention includes a circuit board (e.g., a printed circuit board) and a coil, particularly a planar coil, arranged on or in the circuit board.

[0012] In addition, the device includes a button module mounted on a circuit board, the button module having a housing, a motion mechanism including a push rod and a return spring, and a damping element for changing the inductance and / or physical variables of the coil, wherein the push rod can move relative to the housing between a rest position and an operating position.

[0013] The damping element can move relative to the housing and is arranged such that the movement of the damping element causes a change in the inductance and / or physical variables of the coil.

[0014] A damping element is connected to a push rod, such that the movement of the damping element is triggered by the movement of the push rod. Due to the connected movement of the damping element, the movement of the push rod from the rest position to the operating position causes a change in the inductance and / or physical variables of the coil. When the inductance and / or physical variables of the coil change, the device outputs at least one electrical signal to signal the button operation and / or operating stroke of the button module.

[0015] This utility model specifies that the damping element is supported on the housing and / or circuit board. The movement of the damping element relative to the housing is rotational or linear parallel to the circuit board. The damping element is connected to the push rod such that the rotational or linear movement of the damping element, which causes changes in the inductance and / or physical variables of the coil, differs from the movement of the push rod.

[0016] Therefore, a significant advantage of this invention lies in the fact that the damping element is not directly mounted on the push rod, which serves as the operating component of the button module, and thus does not need to travel the same distance as the push rod. More precisely, the push rod and the damping element are decoupled, allowing the damping element to move from the moment the push rod begins to move, but their strokes differ. The movements are distinct: the push rod moves linearly perpendicular to the circuit board, while the damping element performs either rotational or linear motion, with the linear motion of the damping element parallel to the circuit board. Furthermore, the motion transmission from the push rod to the damping element does not have to be linear and / or proportional; nonlinear and / or disproportionate transmission is also possible.

[0017] Therefore, a transmission mechanism, such as a variable gearbox, is needed to connect the movement of the damping element with the movement of the push rod. This allows for the arbitrary setting and changing of the motion transmission coefficient during operation.

[0018] Rotary bearings and movements of damping elements offer advantages in terms of simple technical implementation, accuracy, reliability, cost, and durability. However, linear movements of damping elements parallel to the circuit board can also prove advantageous, particularly in the spatial design of keypad modules.

[0019] A damping element is specifically understood as an element that causes a change in the inductance of a coil when the element is brought into the magnetic field of the coil and / or when the element moves within the magnetic field of the coil. This process is referred to as “damping” or “damping effect” on the coil.

[0020] The extended embodiment of this utility model stipulates that, due to the connecting movement of the damping element, the opposite movement of the push rod from the operating position to the stationary position also causes a change in the inductance and / or physical variables of the coil. When the inductance and / or physical variables of the coil change, the device outputs at least one electrical signal to signal the release of the button, that is, the push rod returns to the stationary state due to the return spring.

[0021] According to the design scheme, the damping element can rotate about a rotation axis that extends parallel to the circuit board, specifically parallel to the surface of the circuit board.

[0022] The rotational support of the damping element on the housing of the button module can be achieved by inserting at least two opposing protrusions formed on the side of the damping element into a recess in the housing.

[0023] It can be specified that the rotational support of the damping element is achieved by at least two protrusions formed on the damping element and projecting in the direction of the circuit board, wherein the protrusions extend through a through recess in the housing and abut against the circuit board. Therefore, the protrusions protrude through the housing and are supported on the surface of the circuit board. This compensates for the vertical mounting tolerance of the button module relative to the circuit board, because the support is not provided within the housing of the button module but directly on the circuit board. In this way, the position of the damping element relative to the coil on or within the circuit board remains constant.

[0024] The design of this utility model specifies that the damping element has a damping leg and a control leg, which are connected to each other at a certain angle at one end of the leg. During rotational motion, the damping leg pivots toward or away from the coil. During linear motion, the damping leg shifts parallel to the circuit board. The control leg is connected to the push rod to convert the motion of the push rod into rotational or linear motion of the damping element.

[0025] The aforementioned connection between the push rod and the control leg of the damping element can be achieved by the control leg abutting against the push rod, wherein the push rod has a guide profile structure that interacts with the control profile structure of the control leg. During the movement of the push rod, the control profile structure of the control leg slides along the guide profile structure of the push rod, thereby causing the damping leg to rotate toward or away from the coil or to move linearly parallel to the circuit board.

[0026] Furthermore, it can be specified that the return spring is integrated and / or arranged and / or mounted in or on the control leg of the damping element, wherein the return spring of the damping element abuts against the housing of the button module in a pre-tensioned manner, and due to its pre-tension, ensures that the control profile structure of the control leg abuts against the guide profile structure of the push rod. If the return spring is a separate spring arranged and / or mounted on the control leg of the damping element, the separate spring can be designed, for example, as a bending spring, compression spring, tension spring, or coil spring.

[0027] Furthermore, it can be specified that the control profile structure of the control leg includes a control cam that protrudes in the direction of the guide profile structure of the push rod.

[0028] The design scheme specifies that the motion conversion from the movement of the push rod to the rotational motion of the damping leg is determined by the shape of the guide profile structure of the push rod.

[0029] Furthermore, it can be specified that the guide profile structure on the push rod decreases constantly in at least a partial section along a direction opposite to the predetermined operating motion of the push rod, such that when the control cam slides along the constantly decreasing section of the guide profile structure, the constant motion of the push rod in the operating direction results in a constant angular velocity of the damping leg's rotational motion toward the coil. It can also be specified that the guide profile structure on the push rod decreases continuously and gradually in at least a partial section along a direction opposite to the predetermined operating motion of the push rod, such that when the control cam slides along the continuously gradually decreasing section of the guide profile structure, the constant motion of the push rod in the operating direction results in a gradually decreasing angular velocity of the damping leg's rotational motion toward the coil. It can also be specified that the guide profile structure on the push rod increases constantly in at least a partial section along a direction opposite to the predetermined operating motion of the push rod, such that when the control cam slides along the constantly increasing section of the guide profile structure, the constant motion of the push rod in the operating direction results in a constant angular velocity of the damping leg's rotational motion away from the coil. Furthermore, it can be specified that the guide profile structure on the push rod gradually increases in a direction opposite to the predetermined operating motion of the push rod, at least in a partial section, such that when the control cam slides along the section of the guide profile structure that gradually increases in a gradual manner, the constant motion of the push rod in the operating direction results in a gradually decreasing angular velocity of the rotational motion of the damping leg away from the coil.

[0030] One embodiment specifies that a protrusion is formed on the guide contour structure on the push rod, such that during the predetermined operating movement of the push rod, the control cam overcomes the gradually increasing force of the return spring of the damping element and slides to the apex of the protrusion. This requires a gradually increasing force when operating the push rod. After passing the apex of the protrusion, the force disappears. Therefore, passing the apex of the protrusion causes a tactilely perceptible pressure point effect and a sudden change in the rotational direction of the damping leg, thereby causing a relatively significant change in the inductance and / or physical variables of the coil.

[0031] An extended embodiment of the above-described embodiment specifies that the push rod has a main body and a moving body for performing the push rod's movement. The main body has a bottom surface facing the circuit board and a top surface opposite the bottom surface, as well as a recess located laterally between the bottom and top surfaces. The moving body is inserted into the recess and supported on the bottom of the recess in a manner rotatable about a rotation axis perpendicular to a predetermined direction of movement of the main body, the bottom of which is opposite to the opening of the recess. The recess defines a movement space for the moving body, which has an upper stop on the side of the top surface of the main body and a lower stop on the side of the bottom surface of the main body, in which the moving body can rotate between the upper and lower stops. The moving body at least partially forms a guide profile structure for the push rod, wherein the guide profile structure forms a protrusion in the region of the moving body and a groove on the side of the protrusion facing the bottom surface of the main body. In the rest position of the push rod, the moving body rests against the lower stop, and a control cam abuts against the groove on the moving body. As the push rod moves from the rest position to the operating position, the moving body first moves to the upper stop, and the control cam continues to abut against the groove on the moving body. As the push rod continues to move, the moving body first abuts against the upper stop, and the control cam slides out of the groove until it reaches the apex of the protrusion, then the control cam passes over the apex of the protrusion. In this situation, on the one hand, the moving body suddenly moves to the lower stop, generating a limiting impact noise; on the other hand, the damping leg moves towards the coil.

[0032] The advantage of the above-described embodiment is that crossing the apex of the protrusion not only simultaneously induces a tactilely perceptible pressure point effect and a sudden change in the rotational direction of the damping leg, thereby causing a relatively significant change in the inductance and / or physical variables of the coil, but also simultaneously generates a limiting impact noise, which provides auditory feedback to the operator of the button module regarding the performed operation. A particular advantage of the above-described extension is that the moving body is supported only on the body of the push rod and does not contact other housing components of the button module. Furthermore, the moving body is rotatably mounted in the body and can complete its rotational movement within the movement space of the body. Due to the small amplitude of the rotational movement and the relatively small friction generated by the rotational axis itself, the overall frictional balance is ideal. Therefore, compared to known button modules, this button module provides a clear and therefore optimized click noise during operation through its limiting impact noise. Another advantage is that significant changes in sensing are accompanied by tactile and auditory feedback, so that switching and / or signaling processes detected by the changes in sensing (e.g., sending a message to a computer) can also be perceived by the operator simultaneously by touch and hearing.

[0033] The intensity of the limit impact noise depends on the rotation angle of the moving body and / or the weight of the moving body and / or the position of the stop surface and / or the spring force of the damping element's return spring, and can be adjusted by appropriately selecting these parameters. Furthermore, when operating the button module, the pre-stroke or force stroke curve can be adjusted by the rotation angle of the moving body and the guide profile structure.

[0034] As an alternative to the aforementioned design scheme that includes a control cam in the control profile structure of the control leg, it can also be specified that the guide profile structure of the push rod includes a sliding cam that protrudes in the direction of the control profile structure of the control leg of the damping element. An improved embodiment here specifies that the motion conversion from the movement of the push rod to the rotational motion of the damping leg is determined by the shape of the control profile structure of the control leg.

[0035] For all the above variations, it can be specified that the damping leg has a through recess, which is surrounded laterally by the material of the damping leg, such that the damping leg forms a secondary coil with a shorted coil winding, which inductively interacts with the primary coil. According to the design scheme, when the push rod moves from the rest position to the operating position, the secondary coil can rotate into or out of the coil's magnetic field, thereby causing a change in the coil's inductance and / or physical variables.

[0036] Alternatively, the damping leg can be designed as a plate that rotates into or out of the magnetic field of the coil as the push rod moves from the rest position to the operating position, thereby inducing eddy currents in the plate that cause changes in the inductance and / or physical variables of the coil.

[0037] The damping element may be made of ferromagnetic, paramagnetic, or conductive material, or may include ferromagnetic, paramagnetic, or conductive material in at least certain regions.

[0038] Damping elements can be stamped parts made of metal.

[0039] The motion of the push rod can be linear, rotary, or contour-controlled.

[0040] The button module may have an illumination device, or the button module may be associated with an illumination device. The illumination device may be mounted on the circuit board such that it illuminates the associated keycaps with symbols and / or the housing of the button module. One or more light guides may be integrated into the housing of the button module and / or arranged as separate components within the button module.

[0041] The keyboard according to this invention includes one or more devices according to this invention. Attached Figure Description

[0042] Other features and advantages of the present invention will now be described in more detail based on the description of embodiments and with reference to the accompanying schematic diagrams. In the drawings:

[0043] Figures 1 to 3 Different perspective views of the device according to the present invention are shown in the figures.

[0044] Figure 4 An example is shown according to Figure 1 Three variations of the push rod design for the device's button module.

[0045] Figures 5 to 8 Different diagrams illustrate what can be done according to Figure 1 The first embodiment of the damping element used in the button module of the device,

[0046] Figure 9 and Figure 10 It shows the basis from different perspectives. Figure 1 Two exploded perspective views of the device, in which... Figure 4 The variation of the push rod shown on the left and the use of... Figure 5 Damping elements,

[0047] Figures 11 to 13 It shows that according to Figure 9 Cross-sectional views of the device in different motion states.

[0048] Figures 14 to 16 It shows that according to Figure 1 The device is shown in cross-sectional views at different motion states, where the following is used. Figure 4 The variation of the push rod shown in the middle,

[0049] Figure 17 and Figure 18 It shows Figure 4 The diagram on the right shows different variations of the push rod.

[0050] Figures 19 to 22 It shows that according to Figure 1 The device is shown in cross-sectional views at different motion states, where the following is used. Figure 4 The push rod shown on the right is a variation of the same type. Figure 17 and Figure 18 As shown in the figure,

[0051] Figure 23 It shows that it can be based on Figure 1 The second embodiment of the damping element used in the device,

[0052] Figure 24 It shows that according to Figure 1 Exploded perspective view of the device, which uses Figure 4The variation of the push rod shown on the left and the use of... Figure 23 Damping elements,

[0053] Figures 25 to 27 It shows that according to Figure 24 Cross-sectional views of the device in different states.

[0054] In all the accompanying drawings, corresponding parts and components are indicated by the same reference numerals. Detailed Implementation

[0055] Figures 1 to 3 Different perspective views of embodiments of the device 10 according to the present invention are shown. The device 10 includes a circuit board 18 (e.g., a printed circuit board) and a coil 30 (in the illustrated embodiment, a planar coil disposed on or within the circuit board 18) and a key module 11 mounted on the circuit board 18. The device 10 is used to detect key operations and / or operating strokes of the key module 11. Figure 1 A device 10 is shown in which the button module 11 is mounted on a circuit board 10. Figure 2 In the middle, the button module 11 is lifted from the circuit board 18 so that the coil 30 (planar coil) and the lighting device 50 (here, LED) arranged on the circuit board 18 can be seen. Figure 3 A cross-sectional view is shown, in which the interior of the button module 11 can be seen.

[0056] The button module 11 includes a housing 12, which is composed of a first housing portion 13 (upper part or cover) and a second housing portion 14 (lower part or base). The button module 11 also includes a motion mechanism 15 having a push rod 16 and a return spring 17, wherein the push rod 16 is movable relative to the housing 12 between a rest position and an operating position.

[0057] Figure 4 Three variations of the design of the push rod 16 of the button module 11 are illustrated by way of example. These variations will be described in further detail in the following description of the movement of the push rod 16.

[0058] Figure 9 and Figure 10 It shows the basis from different perspectives. Figure 1 Two exploded perspective views of device 10, in which the following is used Figure 4A variation of the push rod 16 shown on the left. It can be seen that the button module 11 also includes a damping element 19, which is used to change the inductance and / or physical variables of the coil 30. For this purpose, the damping element 19 is movably arranged relative to the housing 12. This movable arrangement in the housing 12 is such that movement of the damping element 19 causes a change in the inductance and / or physical variables of the coil 30. The movement of the damping element 19 is triggered by the movement of the push rod 16. To achieve this, the damping element 19 is coupled to the push rod 16, wherein, due to the coupled movement of the damping element 19, movement of the push rod 16 from a rest position to an operating position causes a change in the inductance and / or physical variables of the coil 30. This will be explained in further detail below. The damping element 19 is coupled to the push rod 16 such that the rotational movement of the damping element 19 causing the change in the inductance and / or physical variables of the coil 30 is different from the movement of the push rod 16. This will also be explained in further detail below.

[0059] The device 10 is configured such that when the inductance and / or physical variables of the coil 30 change (as described above), it outputs at least one electrical signal to signal the button operation and / or operation stroke of the button module 11.

[0060] Due to the connecting movement of the damping element 19, the reverse movement of the push rod 16 from the operating position to the rest position also causes a change in the inductance and / or physical variables of the coil 30. It can also be specified here that when the inductance and / or physical variables of the coil 30 change, the device 10 outputs at least one electrical signal to signal the release of the button.

[0061] exist Figure 9 and Figure 10 The embodiment of the damping element 19 shown is in Figures 5 to 8 The first embodiment of the damping element 19 is shown separately.

[0062] Figures 5 to 8 The first embodiment described above, which can be used in the button module 11, is illustrated with different diagrams. This first embodiment is used for... Figures 9 to 16 and Figures 19 to 22 In the device 10 and button module 11 shown. Figure 23 A second embodiment of the damping element 19, shown separately, is illustrated. This second embodiment is used for... Figures 24 to 27 The device 10 and button module 11 are shown. In the first embodiment, the damping element 19 is supported on the housing 12, while in the second embodiment, the damping element 19 is supported on the circuit board 18.

[0063] In both embodiments, the damping element 19 has a damping leg 20 and a control leg 21, which are connected to each other at an angle at one end of the two legs 20, 21.

[0064] The two embodiments shown are designed such that the damping leg 20 of the damping element 19 used in the button module 11 pivots toward or away from the coil 30 by rotational movement, that is, the movement of the damping element 19 relative to the housing 12 is a rotational movement.

[0065] In the first embodiment, the rotational support of the damping element 19 on the housing 12 of the button module 11 is achieved by inserting at least two protrusions 43 opposite to each other on the side of the damping element 19 into recesses 44 in the housing 12. In the example shown, the protrusions 43 are on the side of the control leg 21 of the damping element 19 (see...). Figures 5 to 8 as well as Figure 9 and Figure 10 ).

[0066] In the second embodiment, the rotational support of the damping element 19 is achieved by at least two protrusions 43 formed on the damping element 19 (specifically on the control leg 21) and protruding in the direction of the circuit board 18, wherein the protrusions 43 pass through the through recesses 44 in the housing 12 and abut against the circuit board 18. This can be achieved from... Figure 23 Chinese combination Figure 25 and Figure 26 see. Figure 27 Supplementally shown Figure 26 The cross-sectional view of the device 10 shown is after it has been rotated 90° about the vertical axis.

[0067] The advantage of this second embodiment is that the distance between the damping element 19 (especially its damping leg 20) and the coil 30 on the circuit board 18 does not depend on the mounting accuracy of the button module 11 on the circuit board 18. This is... Figure 25 and Figure 26 This was explained in [the text]. Figure 25 In the middle, the button module 11 is compared to Figure 26 The button module 11 is mounted at a greater distance from the circuit board 18. However, since the damping element 19 is not supported in the housing 12 but directly on the circuit board 18, this different distance between the button module 11 and the housing 12 and the circuit board 18 is irrelevant to the distance between the damping leg 20 and the coil 30 on the circuit board 18. In both cases, the distance is the same. Therefore, the change in inductance and / or physical variables of the coil 30 caused by the movement of the damping leg 20 is independent of the distance between the housing 12 and the circuit board of the button module 11, and therefore independent of the mounting accuracy of the button module 11 on the circuit board 18. Thus, different button modules 11, even if mounted on the circuit board 18 in different ways, will result in a considerable change in the inductance and / or physical variables of the coil 30.

[0068] In both embodiments, the damping element 19 can rotate about a rotation axis extending parallel to the circuit board 18.

[0069] The following description relates to two embodiments of the damping element 19. The damping leg 20 has a through recess 47, which is laterally surrounded by the material of the damping leg 20, such that the damping leg 20 forms a secondary coil 48 with a shorted coil winding 49, which interacts with the coil 30 (as the primary coil) on the circuit board 18. As described in more detail below, when the push rod 16 moves from the rest position to the operating position, the secondary coil 48 rotates into or out of the magnetic field of the coil 30, thereby causing a change in the inductance and / or physical variables of the coil 30.

[0070] As an alternative to the illustrated embodiment, the damping leg 20 of the damping element 19 can also be designed as a plate that rotates into or out of the magnetic field of the coil 30 when the push rod 16 moves from the rest position to the operating position, thereby inducing eddy currents in the plate, which cause changes in the inductance and / or physical variables of the coil 30.

[0071] The following description relates to two embodiments of the damping element 19. To convert the motion of the push rod 16 into rotational motion of the damping element 19, a control leg 21 is connected to the push rod 16. The connection between the push rod 16 and the control leg 21 of the damping element 19 is achieved by the control leg 21 abutting against the push rod 16. This is achieved by a return spring 45 integrated into the control leg 21 of the damping element 19; in the illustrated embodiment, the return spring 45 is integrally formed with the control leg 21 and the damping leg 20. Alternatively, other arrangements and / or connections of the return spring on the control leg 21 are also possible. The return spring 45 of the damping element 19 abuts against the housing 12 of the button module 11 in a preloaded manner. Due to the preload of the return spring, the return spring 45 of the damping element 19 ensures that the control leg 21 abuts against the push rod 16.

[0072] The push rod 16 has a guide profile structure 34 that interacts with the control profile structure 35 of the control leg 21. In the illustrated embodiment, the control profile structure 35 is divided into two parts. When the push rod 16 moves, the control profile structure 35 of the control leg 21 slides along the guide profile structure 34 of the push rod 16, thereby realizing the rotational movement of the damping leg 20 toward or away from the coil 30. Due to the preload of the return spring, the return spring 45 of the damping element 19 ensures that the control profile structure 35 of the control leg 21 abuts against the guide profile structure 34 of the push rod 16.

[0073] The control profile structure 35 for controlling the outrigger 21 includes a control cam 36, which in both embodiments is a two-part control cam 36. The control cam 36 protrudes in the direction of the guide profile structure 34 of the push rod 16.

[0074] The motion transition from the motion of push rod 16 to the rotational motion of damping leg 20 is determined by the shape of the guide profile structure 34 of push rod 16.

[0075] For example, the guide profile structure 34 on the push rod 16 can be continuously and gradually reduced in at least a partial section in the direction opposite to the predetermined operating movement of the push rod 16, such that when the control cam 36 slides along the continuously and gradually reduced section of the guide profile structure 34, the constant movement of the push rod in the operating direction results in a gradually decreasing angular velocity of the rotational movement of the damping leg 20 toward the coil 30. For example, the push rod 16 can be configured to... Figure 4 The design is based on a variation on the left side. According to this variation of push rod 16, its corresponding movement process is exemplarily described in... Figure 11 , Figure 12 and Figure 13 As shown, the push rod 16 is gradually pressed into the housing 12 in a predetermined direction of motion (i.e., from the rest position of the push rod 16 to the operating position): from Figure 11 The stationary position in the middle, via Figure 12 The middle position, until Figure 13 The operation location within.

[0076] It can also be specified that a protrusion 37 is formed on the guide contour structure 34 on the push rod 16, so that during the predetermined operating movement of the push rod 16, the control cam 36 slides against the gradually increasing force of the return spring 45 of the damping element 19 to the apex 39 of the protrusion 37, which requires a gradually increasing force when operating the push rod 16. After passing the apex 39 of the protrusion 37, the force disappears, thus causing a tactilely perceptible pressure point effect and a sudden change in the rotational direction of the damping leg 20, thereby causing a relatively significant change in the inductance and / or physical variables of the coil 30. For example, the push rod 16 can be configured to... Figure 4 The design is based on an intermediate variation. According to this variation of the push rod 16, its corresponding motion process is exemplarily described in... Figure 14 , Figure 15 and Figure 16 As shown, the push rod 16 is gradually pressed into the housing 12 in a predetermined direction of movement (i.e., from the rest position of the push rod 16 to the operating position): from Figure 14 The stationary position in the middle, via Figure 15 The middle position, until Figure 16 The operation location within.

[0077] Figure 17 and Figure 18 It shows Figure 4 Different illustrations of a variant of the push rod 16 shown on the right. The push rod 16 has a main body 22 that performs the movement of the push rod 16 and a moving body 23. Figure 17 In the middle, the two parts of the push rod are assembled together, while Figure 18 The body 22 is disassembled and displayed. It has a bottom surface 24 facing the circuit board 18 and a top surface 25 opposite to the bottom surface 24, and a recess 26 laterally located between the bottom surface 24 and the top surface 25. A moving body 23 is inserted into this recess 26 and supported on the bottom 28 of the recess 26 in a manner rotatable about a rotation axis 29 perpendicular to a predetermined direction of movement 46 of the body 22. This bottom 28 is opposite to the opening 27 of the recess 26.

[0078] The recess 26 defines a movement space 31 for the moving body 23, which has an upper stop 32 on the side of the top surface 25 of the main body 22 and a lower stop 33 on the side of the bottom surface 24 of the main body 22, in which the moving body 23 can rotate between the upper stop 32 and the lower stop 33.

[0079] The moving body 23 forms the guide contour structure 34 of the push rod 16. The guide contour structure 34 forms a protrusion 37, which is connected to... Figure 4 The aforementioned protrusion is equivalent to the intermediate variant of the push rod 16. Furthermore, the guide profile structure 34 forms a groove 38 on the side of the protrusion 37 facing the bottom surface 24 of the body 22.

[0080] The moving body 23 has a top surface 40 and a bottom surface 41. In the illustrated embodiment, stop protrusions 42 are mounted and / or formed on the bottom surface 41. Alternatively or additionally, these stop protrusions may also be mounted and / or formed on the top surface 40.

[0081] Based on this variation of the push rod 16 having a main body 22 and a moving body 23, its corresponding motion process is exemplarily described in Figures 19 to 22 As shown, the push rod 16 is gradually pressed into the housing 12 in a predetermined direction of movement (i.e., from the rest position of the push rod 16 to the operating position): from Figure 19 The stationary position in the middle, via Figure 20 and Figure 21 The two middle positions in the middle, until Figure 22 The operation location within.

[0082] In the rest position of push rod 16, moving body 23 abuts against lower stop 33, and control cam 36 abuts against groove 38 on moving body 23 (see...). Figure 19When push rod 16 moves from the rest position to the operating position, moving body 23 first moves in the direction of upper stop 32, and control cam 36 continues to abut against the groove 38 on moving body 23. As push rod 16 continues to move, moving body 23 first abuts against upper stop 32, and control cam 36 slides out of groove 38 against the gradually increasing force of return spring 45 of damping element 19 until the apex 39 of protrusion 37 (see...). Figure 20 This requires gradually increasing the force when operating push rod 16. During this process, damping leg 20 is removed from coil 30.

[0083] Then, the control cam 36 passes the apex 39 of the protrusion 37. During this process, on the one hand, the moving body suddenly moves to the lower stop. Limiting impact noise is generated during this process. On the other hand, the damping leg 20 experiences a sudden change in the direction of rotational motion and moves towards the coil 30 (see...). Figure 21 Furthermore, after passing the apex 39 of the protrusion 37, the aforementioned force disappears. Therefore, passing the apex 39 of the protrusion 37 will cause a tactilely perceptible pressure point effect and a sudden change in the rotational direction of the damping leg 20, thereby causing a relatively significant change in the inductance and / or physical variables of the coil 30, as well as limiting impact noise caused by the moving body 23.

[0084] Finally, push rod 16 moves to the operating position against the restoring force of push rod 16's return spring 17. Figure 22 ).

[0085] In all implementation variations, the damping element 19 may be made of a ferromagnetic, paramagnetic, or conductive material, or may include a ferromagnetic, paramagnetic, or conductive material in at least certain regions.

[0086] The damping element shown in the figure is a one-piece component. Alternatively, it can be composed of two or more parts. In particular, the damping element 19 can be a stamped part made of metal.

[0087] The movement of the aforementioned push rod (which in turn causes the movement of the damping element 19) can be linear.

[0088] Therefore, this invention specifically proposes a device for detecting button operation and / or operating stroke of a button module, wherein the damping element, unlike known button modules, is not directly placed on the push rod that serves as the operating element, but is instead supported separately within the housing of the button module. Here, the movement of the damping element is connected to the movement of the push rod via a variable transmission mechanism (e.g., a variable gearbox). Thus, not only can the motion transmission coefficient be arbitrarily set, but it can also be arbitrarily changed during operation.

[0089] Furthermore, in one variation, the damping element is designed to rotate, while the push rod can perform linear motion. The rotary support of the damping element offers advantages in terms of simple technical implementation, accuracy, reliability, cost, and durability.

[0090] For example, the damping element can be designed in the form of an L-shaped lever arm. At least one sliding cam (preferably two sliding cams) is arranged on the vertical support leg, and the sliding cam slides on the guide profile structure of the push rod.

[0091] The damping element is equipped with a return spring that rotates the damping element in the direction of the coil on the circuit board. The horizontal support leg of the damping element is preferably designed as a ring, i.e., a short-circuited secondary winding, and is already partially located in the magnetic field of the coil when the switch is in the rest position. This creates electromagnetic coupling between the primary coil on the circuit board and the closed secondary coil (i.e., the short-circuited secondary winding) of the damping element. Energy from the magnetic field is induced in the secondary winding of the damping element, current flows in the short-circuited secondary winding, and the induced energy is converted into heat. This results in a decrease in inductance or other changes in physical characteristics.

[0092] This change can be detected and converted into a signal in several ways. During operation, the damping element rotates into the magnetic field of the coil, and electromagnetic coupling is enhanced. This, for example, changes the inductance, resulting in a change in the signal. This signal change can be used to detect one or more switching points, thus enabling travel measurement.

[0093] The damping element can also be designed as a plate made of conductive material. Here, the energy of the magnetic field is generated in the damping element as eddy current induction and is also converted into heat. As in the first case, changes in inductance or other physical variables are possible.

[0094] The swivel bearing can be achieved by mounting two protrusions on the damping element into a V-shaped bearing opening in the housing of the button module.

[0095] Preferably, the damping element can be manufactured as a stamped part at low cost, where the return spring can be designed as a C-shaped bending spring. The return spring can be designed as a bending spring, a separate helical spring, a compression spring, or a tension spring.

[0096] The push rod of the button module has at least one, preferably two, control lugs with arbitrary guide profile structures. For example, continuous motion of the push rod can be converted into continuous rotation of a damping element through a constant-angle inclined profile. Here, the transmission ratio or rotation angle can be adjusted by the inclination of the inclined plane and / or by the lever ratio of the two legs of the damping element and / or by the position of the rotation axis. In this case, the rotation of the damping element is proportional to the operating motion of the push rod. Due to the superproportional increase in magnetic field coupling, the inductance or output signal will exhibit a gradual nonlinear change relative to the operating stroke. This behavior is not optimal.

[0097] Furthermore, the guide profile structure on the push rod can be designed to be non-linear. Here, in the rest position, the angle between the guide profile structure and the control cam on the damping element can be designed to be relatively steep, gradually flattening out with increasing operation, i.e., presenting a decreasing curve. Therefore, the angular velocity of the damping element gradually decreases while the push rod speed remains constant during operation, and the damping effect on the coil decreases. In this way, the non-linearity of the inductance travel curve can be compensated for and linearized. Therefore, a sensor with decreasing, increasing, and linear inductance travel curves can be provided.

[0098] Simultaneously, a raised profile can be installed on the push rod to form a tactile button module. The lateral force of the return spring of the damping element generates different resistances on the push rod according to the profile of the control cam. In the case of a tactile switch, the operating force gradually increases before reaching the apex of the guide profile structure and decreases after the apex. During this process, the operator will feel a noticeable pressure point effect when operating the button module.

[0099] Similarly, the damping element will suddenly move into the coil's magnetic field, causing a sudden signal change. In any case, the pressure point and the significant signal change are synchronized along the travel axis. The distance between the pressure point and the electrical switching point can be arbitrarily adjusted by regulating the switching threshold.

[0100] A click switch, also known as a click switch with tactile and auditory feedback, can be implemented similarly to a pressure point switch, but the control contour is not located on the main body of the actuator, but on the moving part of the actuator, also called the clicker. The clicker is rotatably fixed to the main body of the actuator and can complete rotational movement within a sector. During operation, the clicker rotates about its axis of rotation until it reaches a stop on the actuator, causing the damping element to deflect and generating a perceptible increase in force on the actuator. After passing the apex, the clicker suddenly rotates in the opposite direction until it reaches the stop on the actuator, producing an impact noise. Simultaneously, the damping element suddenly rotates in the coil direction, producing a significant signal change. Similar to tactile variations, the signal change is synchronized with the pressure point or click point.

[0101] The reset of all switch variations is achieved by a separate compression spring positioned between the push rod and the switch housing.

[0102] The switch includes at least a housing, a damping element with an integrated return spring, a push rod, and a cylindrical return spring. The housing may be integrally molded, consist of a base and a cover, or be designed as a multi-piece unit.

[0103] The above functional description applies to a variant in which the damping element rotates in the direction of the coil via a return spring. The damping element rotates away from the coil during reset and towards the coil during operation via a guide profile structure on the push rod. The reset force is provided by an additional cylindrical compression spring preloaded between the housing and the push rod, resisting the force of the return spring on the damping element. During switch operation, the damping effect on the coil gradually increases, causing the sensor's inductance to gradually decrease during switch operation.

[0104] Alternatively, the opposite function can be envisioned, where the damping of the coil gradually decreases with increasing operation. In this case, the inductance of the coil increases during operation. This can be achieved by controlling the reverse profile of the cam. In the rest position of the push rod, the damping element rotates towards the coil, and during operation, the damping element rotates away from the coil.

[0105] Another embodiment variation can be achieved by mounting or forming the guide profile structure on the opposite side and the inner side of the push rod.

[0106] Another variation is possible, in which a guide profile structure is mounted on the vertical leg of the damping element instead of a cam, and a simple cam is mounted on the push rod that moves along the guide profile structure on the damping element. Here, the guide profile structure can be stamped in a low-cost manner, or, for example, injection molded as a plastic part or a snap-fit ​​connection.

[0107] The return spring on the damping element can be designed as a bending spring integrated with the damping element. Alternatively, the return spring can be a separate bending spring, helical spring, compression spring, or tension spring.

[0108] The push rod return spring can also be designed as a compression spring, helical spring, tension spring or bending spring, for example, made of metal wire or sheet metal.

[0109] Preferably, the push rod of the button module moves linearly and perpendicular to the button housing or circuit board. However, it is also conceivable to design the push rod movement in the button module as rotary or contour-controlled.

[0110] Preferably, the damping element is rotatably mounted inside the housing. However, the damping element can also be mounted inside the housing, allowing it to perform linear displacement or rotation in the horizontal direction. Here, the damping effect on the coil is achieved by the displacement of the damping element parallel to the coil. The stroke ratio and displacement speed can be determined by the control profile on the push rod, as in the preferred variant.

[0111] To improve the illumination of keycaps, light guides can be integrated into the cover, which can either homogenize the illumination or provide targeted, more intense illumination to specific keycap areas.

[0112] In another embodiment, the light guide can be installed as a separate component in the switch housing.

[0113] One variant specifies that the support for the damping element does not occur entirely within the housing as in the variant described above. In the X and Y directions, the support occurs within the housing as in the variant described above. However, in the Z direction, the position of the damping element is determined by the circuit board (i.e., the printed circuit board). Support legs protrude through the housing and rest on the surface of the circuit board. This compensates for the vertical assembly tolerances of the button module relative to the circuit board. The advantage of this is that the position of the damping element relative to the coil is always the same, regardless of manufacturing tolerances. For example, the damping element can be equipped with a dual-function spring area. For example, a T-shaped spring can ensure rotation relative to the circuit board, thereby ensuring rotation relative to the coil. Two horizontal spring plates press the damping element against the circuit board in the vertical direction. Of course, other spring plate shapes are also possible, not just "T" shaped spring plates.

[0114] Reference tag list

[0115] 10 devices

[0116] 11 Button Module

[0117] 12. Outer shell

[0118] 13 First outer shell section

[0119] 14 Second outer shell section

[0120] 15 Sports Organizations

[0121] 16 Putter

[0122] 17 push rod 16 return spring

[0123] 18 Circuit board

[0124] 19 Damping elements

[0125] 20 damping elements and 19 damping legs

[0126] 21 Damping element 19 Control leg

[0127] 22-push-stick 16-body

[0128] 23 putter 16 motion body

[0129] 24 main body 22 bottom surface

[0130] 25 main body 22 top surface

[0131] 26 Recess in body 22

[0132] 27 Recess 26 Opening

[0133] 28 bottom of recess 26

[0134] 29 Rotation axis

[0135] 30 coils

[0136] The movement space in the recess 26 of 31

[0137] 32 Upper stop

[0138] 33 Lower stop component

[0139] 34 push rod 16 guide profile structure

[0140] 35 control outriggers 21 control contour structure

[0141] 36 Control contour structure 35 Control cam

[0142] 37. Protrusions of guide contour structure 34

[0143] 38 guide contour structure 34 groove

[0144] 39 protrusions, 37 apex

[0145] Top surface of 40 moving body 23

[0146] 41 The bottom surface of moving body 23

[0147] 42 stop protrusions

[0148] 43 Protrusions on damping element 19

[0149] 44 Recess in the outer casing for the protrusion 43

[0150] 45 Damping element 19 return spring

[0151] 46 Entities 22 Expected direction of movement

[0152] 47 Damping outrigger 20 through recess

[0153] 48 secondary coils

[0154] 49 secondary coil 48 coil winding

[0155] 50 lighting fixtures.

Claims

1. A device (10) for detecting key operations and / or operating strokes of a key module (11), comprising: Circuit board (18), Coils (30) arranged on or in the circuit board (18), A button module (11) mounted on the circuit board (18) has a housing (12), a motion mechanism (15) including a push rod (16) and a return spring (17), and a damping element (19) for changing the inductance and / or physical variables of the coil (30). The push rod (16) is capable of moving relative to the housing (12) between a rest position and an operating position. The damping element (19) is movable relative to the housing (12) and is arranged such that the movement of the damping element (19) causes a change in the inductance and / or physical variables of the coil (30). The damping element (19) is connected to the push rod (16), such that the movement of the damping element (19) is triggered by the movement of the push rod (16). The movement of the push rod (16) from the rest position to the operating position, caused by the connection movement of the damping element (19), results in changes in the inductance and / or physical variables of the coil (30). When the inductance and / or physical variables of the coil (30) change, the device (10) outputs at least one electrical signal to signal the button operation and / or operation stroke of the button module (11). Its features are, The damping element (19) is supported on the housing (12) and / or the circuit board (18). The movement of the damping element (19) relative to the housing (12) is either rotational or linear, parallel to the circuit board (18). The damping element (19) is connected to the push rod (16) such that the rotational or linear motion of the damping element (19) that causes changes in the inductance and / or physical variables of the coil (30) is different from the motion of the push rod (16).

2. The apparatus (10) according to claim 1, characterized in that, Due to the connecting movement of the damping element (19), the movement of the push rod (16) from the operating position to the rest position causes a change in the inductance and / or physical variables of the coil (30). When the inductance and / or physical variables of the coil (30) change, the device (10) outputs at least one electrical signal to signal the release of the button.

3. The apparatus (10) according to claim 1 or 2, characterized in that, The damping element (19) is rotatable about a rotation axis that extends parallel to the circuit board (18).

4. The apparatus (10) according to any one of the preceding claims, characterized in that, The damping element (19) is rotatably supported on the housing (12) of the button module (11) by inserting at least two opposing protrusions (43) formed on the side of the damping element (19) into the recesses (44) in the housing (12).

5. The apparatus (10) according to any one of claims 1 to 3, characterized in that, The rotational support of the damping element (19) is achieved via at least two protrusions (43) formed on the damping element (19) and projecting in the direction of the circuit board (18), wherein the protrusions (43) extend through the through recess (44) in the housing (12) and abut against the circuit board (18).

6. The apparatus (10) according to any one of the preceding claims, characterized in that, The damping element (19) has a damping leg (20) and a control leg (21), the damping leg (20) and the control leg (21) being connected to each other at one end of the legs (20, 21) at a certain angle. During the rotational motion, the damping leg (20) pivots toward or away from the coil (30), and during the linear motion, the damping leg (20) shifts parallel to the circuit board (18). The control leg (21) is connected to the push rod (16) to convert the motion of the push rod (16) into the rotational or linear motion of the damping element (19).

7. The apparatus (10) according to claim 6, characterized in that, The connection between the push rod (16) and the control leg (21) of the damping element (19) is achieved by the control leg (21) abutting against the push rod (16), wherein the push rod (16) has a guide profile structure (34), the guide profile structure (34) interacts with the control profile structure (35) of the control leg (21), wherein when the push rod (16) moves, the control profile structure (35) of the control leg (21) slides along the guide profile structure (34) of the push rod (16), thereby causing the damping leg (20) to rotate toward or away from the coil (30), or to move linearly parallel to the circuit board (18).

8. The apparatus (10) according to claim 7, characterized in that, The return spring (45) is integrated and / or arranged and / or mounted in or on the control leg (21) of the damping element (19), wherein the return spring (45) of the damping element (19) abuts against the housing (12) of the button module (11) in a pre-tensioned manner, and due to the pre-tension of the return spring, the control profile structure (35) of the control leg (21) abuts against the guide profile structure (34) of the push rod (16).

9. The apparatus (10) according to claim 8, characterized in that, The control profile structure (35) of the control leg (21) includes a control cam (36) that protrudes in the direction of the guide profile structure (34) of the push rod (16).

10. The apparatus (10) according to claim 9, characterized in that, The motion transition from the movement of the push rod (16) to the rotational motion of the damping leg (20) is determined by the shape of the guide profile structure (34) of the push rod (16).

11. The apparatus (10) according to claim 10, characterized in that, The guide profile structure (34) on the push rod (16) decreases at least partially and constantly in the direction opposite to the predetermined operating motion of the push rod (16), such that when the control cam (36) slides along the constantly decreasing section of the guide profile structure (34), the constant motion of the push rod in the operating direction results in a constant angular velocity of the rotational motion of the damping leg (20) toward the coil (30), or The guide profile structure (34) on the push rod (16) gradually decreases at least partially in the opposite direction to the predetermined operating motion of the push rod (16), such that when the control cam (36) slides along the gradually decreasing section of the guide profile structure (34), the constant motion of the push rod in the operating direction results in a gradually decreasing angular velocity of the rotational motion of the damping leg (20) toward the coil (30), or The guide profile structure (34) on the push rod (16) increases at least partially and constantly in a direction opposite to the predetermined operating motion of the push rod (16), such that when the control cam (36) slides along the constantly increasing section of the guide profile structure (34), the constant motion of the push rod in the operating direction results in a constant angular velocity of the rotational motion of the damping leg (20) away from the coil (30), or The guide profile structure (34) on the push rod (16) gradually increases in at least a partial section in the direction opposite to the predetermined operating motion of the push rod (16), such that when the control cam (36) slides along the section of the guide profile structure (34) that gradually increases in the direction of the continuous decreasing motion, the constant motion of the push rod in the operating direction causes the damping leg (20) to rotate away from the coil (30) at a gradually decreasing angular velocity.

12. The apparatus (10) according to claim 10 or 11, characterized in that, The guide profile structure (34) on the push rod (16) forms a protrusion (37), such that during the predetermined operation of the push rod (16), the control cam (36) overcomes the gradually increasing force of the return spring (45) of the damping element (19) and slides to the apex (39) of the protrusion (37). This requires a gradually increasing force when operating the push rod (16). After passing the apex (39) of the protrusion (37), the force disappears. Therefore, passing the apex (39) of the protrusion (37) causes a tactilely perceptible pressure point effect and a sudden change in the rotational direction of the damping leg (20), thereby causing a relatively significant change in the inductance and / or physical variables of the coil (30).

13. The apparatus (10) according to claim 12, characterized in that, The push rod (16) has a main body (22) for performing the movement of the push rod (16) and a moving body (23). The main body (22) has a bottom surface (24) facing the circuit board (18) and a top surface (25) opposite to the bottom surface (24), and a recess (26) located laterally between the bottom surface (24) and the top surface (25). The moving body (23) is inserted into the recess (26) and supported on the bottom (28) of the recess (26) in a manner that allows it to rotate about a rotation axis (29) perpendicular to a predetermined direction of movement (46) of the main body (22). The bottom (28) is opposite to the opening (27) of the recess (26). The recess (26) defines a movement space (31) for the moving body (23). The movement space has an upper stop (32) on the side of the top surface (25) of the main body (22) and a lower stop (33) on the side of the bottom surface (24) of the main body (22). In the movement space, the moving body (23) is able to rotate between the upper stop (32) and the lower stop (33). The moving body (23) at least partially forms the guide contour structure (34) of the push rod (16). The guide contour structure (34) forms the protrusion (37) in the region of the moving body (23), and forms a groove (38) on the side of the protrusion (37) facing the bottom surface (24) of the main body (22). In the rest position of the push rod (16), the moving body (23) abuts against the lower stop (33), and the control cam (36) abuts against the groove (38) on the moving body (23). When the push rod (16) moves from the rest position to the operating position, the moving body (23) first moves in the direction of the upper stop (32), and the control cam (36) continues to abut against the groove (38) on the moving body (23). When the push rod (16) continues to move, the moving body (23) first abuts against the upper stop (32), and the control cam (36) slides out of the groove (38) until the apex (39) of the protrusion (37). Then the control cam (36) passes the apex (39) of the protrusion (37). In this case, on the one hand, the moving body (23) suddenly moves to the lower stop (33) and generates a limiting impact noise in the process. On the other hand, the damping leg (20) moves toward the coil (30).

14. The apparatus (10) according to claim 7 or 8, characterized in that, The guide profile structure (34) of the push rod (16) includes a sliding cam that protrudes in the direction of the control profile structure (35) of the control leg (21) of the damping element (19).

15. The apparatus (10) according to claim 14, characterized in that, The motion transition from the movement of the push rod (16) to the rotational motion of the damping leg (20) is determined by the shape of the control profile structure (35) of the control leg (21).

16. The apparatus (10) according to any one of claims 6 to 15, characterized in that, The damping leg (20) has a through recess (47) which is surrounded on the side by the material of the damping leg (20), such that the damping leg (20) forms a secondary coil (48) with a short-circuited coil winding (49), which inductively interacts with the coil (30) which is the primary coil.

17. The apparatus (10) according to claim 16, characterized in that, When the push rod (16) moves from the rest position to the operating position, the secondary coil (48) rotates into or out of the magnetic field of the coil (30), thereby causing a change in the inductance and / or physical variables of the coil (30).

18. The apparatus (10) according to any one of claims 6 to 15, characterized in that, The damping leg (20) is designed as a plate. When the push rod (16) moves from the rest position to the operating position, the plate is rotated into or away from the magnetic field of the coil (30), thereby inducing eddy currents in the plate, which cause changes in the inductance and / or physical variables of the coil (30).

19. The apparatus (10) according to any one of the preceding claims, characterized in that, The damping element (19) is made of a ferromagnetic, paramagnetic, or conductive material, or at least in a portion thereof comprises a ferromagnetic, paramagnetic, or conductive material.

20. The apparatus (10) according to any one of the preceding claims, characterized in that, The damping element (19) is a stamped part made of metal.

21. The apparatus (10) according to any one of the preceding claims, characterized in that, The motion of the push rod (16) is linear motion, rotational motion, or contour-controlled motion.

22. The apparatus (10) according to any one of the preceding claims, characterized in that, The button module (11) has a lighting device (50), or the button module (11) is associated with the lighting device (50). The lighting device (50) is mounted on the circuit board (18) such that the lighting device (50) illuminates the associated keycaps with symbols and / or the housing (12) of the key module (11).

23. The apparatus (10) according to claim 22, characterized in that, One or more light guides are integrated into the housing (12) of the button module (11) and / or arranged as separate components in the button module (11).

24. A keyboard comprising one or more means (10) according to any one of the preceding claims.

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