Key module and keyboard

Abstract

Key module (10) include a case (11), a movement mechanism (15) comprising a plunger (16) and a return spring (17), wherein the plunger (16) is movable relative to the housing (11) between a rest position and an actuating position, a contact piece (18) fixed in the housing (11), and a contact element (19) made of a U-shaped bent contact spring material with a first leg (20) and a second leg (21), wherein the first leg (20) is fixed in the housing (11) and the second leg (21) is arranged freely in the housing (11) opposite the contact element (18), wherein contact piece (18) and contact transmitter (19) cooperate in forming an electrical contact, in that in the actuating position of the plunger (16) the second leg (21) of the contact transmitter (19) is biased against its first leg (20) against the contact piece (18) and in the rest position of the plunger (16) the second leg (21) of the contact transmitter (19) is lifted by the plunger (16) against the bias from the contact piece (18) and thus the electrical contact is interrupted, characterized by the fact that the plunger (16) has a main body (22) which executes the movement of the plunger (16) and a moving body (23), wherein the main body (22) has a bottom (24) and a top (25) opposite the bottom (24) in the direction of actuation and a recess (26) laterally between the bottom (24) and the top (25), into which the moving body (23) is inserted and is rotatably mounted on a base (28) of the recess (26) opposite an opening (27) of the recess (26) about an axis of rotation (29) perpendicular to a provided direction of movement (30) of the main body (22), wherein the recess (26) defines a movement space (31) for the moving body (23) with an upper stop (32) on the side of the top (25) of the main body (22) and a lower stop (33) on the side of the bottom (24) of the main body (22), in which the moving body (23) is rotatable between the upper stop (32) and the lower stop (33), wherein the plunger (16) for lifting the second leg (21) of the contactor (19) from the contact piece (18) rests against the second leg (21) via its moving body (23), wherein the moving body (23) has a guide profile (34) which interacts with a control profile (35) of the second leg (21), wherein the control profile (35) of the second leg (21) comprises a control cam (36) which protrudes towards the guide profile (34) of the moving body (23), wherein the guide profile (34) forms a projection (37) and on the side of the projection (37) facing the underside (24) of the main body (22) a recess (38), wherein in the rest position of the plunger (16) the moving body (23) rests against the lower stop (33) and the control cam (36) rests in the recess (38) on the moving body (23) and the second leg (21) of the contactor (19) is lifted against the preload from the contact piece (18) and thus the electrical contact is interrupted, wherein when the plunger (16) moves from the rest position towards the actuating position, the moving body (23) is first moved towards the upper stop (32) and the control cam (36) continues to rest in the recess (38) on the moving body (23) and the second leg (21) of the contactor (19) continues to be lifted against the preload from the contact piece (18) and thus the electrical contact remains interrupted, as the plunger (16) continues to move, the moving body (23) initially rests against the upper stop (32) and the control cam (36) slides out of the recess (38) to a vertex (39) of the projection (37), and subsequently the control cam (36) passes over the vertex (39) of the projection (37), thereby abruptly moving the moving body (23) to the lower stop (33) and generating a striking noise, and simultaneously the guide profile (34) following the vertex (39) of the projection (37) releases the control cam (36), and thus the second leg (21) of the contactor (19) rests against the contact piece (18) due to the preload and the electrical contact is closed.

Description

[0001] The invention relates to a key module and a keyboard comprising one or more such key modules.

[0002] Key modules are a key component of keyboards. In addition to the quality of the key modules themselves, keyboards must also meet specific requirements regarding the click sound they produce when pressed. Common key modules often feature mechanisms with relatively high relative movements. This causes friction, resulting in an unreliable and inconsistent click sound. To improve the sound, the individual components require high precision and must be treated with polytetrafluoroethylene, or PTFE. Future restrictions on this may arise due to a potential PTFE ban.

[0003] Users often find the noise generated by current keyboard modules unpleasant. This noise is caused by freely moving parts within the modules, resulting in undefined sounds. The noises resemble a rattling sound and are also too loud.

[0004] Therefore, there is a desire for key modules with a quiet, discreet and / or defined click sound when pressed.

[0005] Known click mechanisms in key modules require additional guidance in the housing, which increases the cost of the key modules.

[0006] Key modules are known from DE 32 29 465 A1, CN 116259490 A, CN 108231467 A, CN 203386635 U, CN 208226984 U, CN 208241649 U, CN 213988686 U, CN 216871803 U, EP 3794 623 B1 and US 5,372,442.

[0007] The invention is therefore based on the objective of providing a new key module, in particular a key module that provides an improved, especially a defined, click sound when actuated. Furthermore, a keyboard with one or more such key modules is to be provided.

[0008] This problem is solved with respect to the keypad module by a keypad module having the features of claim 1 and with respect to the keyboard by a keyboard having the features of claim 9. Advantageous embodiments and further developments are specified in the dependent claims.

[0009] The keypad module according to the invention comprises a housing, a movement mechanism comprising a plunger and a return spring, wherein the plunger is movable relative to the housing between a rest position and an actuation position. The keypad module further comprises a contact element fixed in the housing and a contact transmitter made of a U-shaped bent contact spring material with a first leg and a second leg, wherein the first leg is fixed in the housing and the second leg is freely arranged opposite the contact element in the housing.

[0010] The contact piece and contactor work together to form an electrical contact, whereby in the actuating position of the plunger the second leg of the contactor is biased against its first leg and rests against the contact piece, and in the rest position of the plunger the second leg of the contactor is lifted away from the contact piece by the plunger against the bias, thus interrupting the electrical contact.

[0011] The plunger has a main body that executes the movement of the plunger and a moving body, wherein the main body has a bottom and a top opposite the bottom in the direction of actuation and a recess laterally between the bottom and top, into which the moving body is inserted and is rotatably mounted on a bottom of the recess opposite an opening of the recess about an axis of rotation perpendicular to a provided direction of movement of the main body.

[0012] The recess defines a movement space for the moving body with an upper stop on the top side of the main body and a lower stop on the bottom side of the main body, in which the moving body can rotate between the upper stop and the lower stop.

[0013] To lift the second leg of the contactor from the contact piece, the plunger rests against the second leg via its moving body.

[0014] The moving body has a guide profile that interacts with a control profile of the second leg, wherein the control profile of the second leg includes a control cam that protrudes towards the guide profile of the moving body.

[0015] The guide profile forms a projection and a recess on the side of the projection facing the underside of the main body.

[0016] In the rest position of the plunger, the moving body rests against the lower stop, the control cam rests in the recess on the moving body, and the second leg of the contactor is lifted against the preload from the contact piece, thus interrupting the electrical contact.

[0017] When the plunger moves from the rest position towards the actuation position, the moving body is first moved towards the upper stop, the control cam remains in the recess on the moving body, and the second leg of the contactor remains lifted against the preload from the contact piece, thus keeping the electrical contact interrupted.

[0018] As the plunger continues to move, the moving body initially rests against the upper stop, and the control cam slides out of the recess to a point on the projection. The control cam then passes over this point, abruptly moving the moving body to the lower stop. This action produces a knocking sound. Simultaneously, the guide profile following the projection's apex releases the control cam. Due to the preload, the second leg of the contactor then rests against the contact piece, and the electrical contact is closed.

[0019] The advantages of the invention arise particularly from the fact that the moving element is mounted exclusively on the main body of the plunger and does not come into contact with other housing parts of the key module. Furthermore, the moving element is rotatably mounted within the main body and can complete its rotational movement within the movement space of the main body. Since the rotational movement is small and the axis of rotation generates relatively little friction anyway, the overall friction balance is very favorable.

[0020] Thus, the keypad module according to the invention provides a defined and therefore improved click sound when actuated, compared to known keypad modules. A further advantage is that the electrical contact during actuation of the keypad module, and thus the electrical signal output during actuation, coincides in a predetermined manner with the impact sound, which constitutes the desired click sound, due to the movement sequence within the keypad module.

[0021] The intensity of the impact noise depends on the rotation angle of the moving body and / or its weight and / or the position of the impact surfaces and / or the spring force of the contact element, and can be adjusted by selecting these parameters accordingly. Furthermore, the pre-travel distance or force-displacement curve when the keypad is actuated can be adjusted by the rotation angle and the guide profile of the moving body.

[0022] A further development of the invention provides that, as the control cam slides out of the recess to the apex of the projection, the second leg is additionally pressed against the preload by the first leg, which requires an increasing force when actuating the plunger, which disappears after passing the apex of the projection, so that passing the apex of the projection simultaneously with the closing of the electrical contact and the emission of the impact noise causes a tactilely perceptible pressure point effect.

[0023] According to one embodiment, when the plunger moves from the actuating position towards the rest position, the initially released control cam contacts the guide profile and is then, with further movement of the plunger, pressed by the guide profile against the preload, so that the second leg of the contactor is lifted from the contact piece and thus the electrical contact is interrupted.

[0024] It can be designed so that the moving part in the recess of the main body of the plunger has only one rotational degree of freedom about the aforementioned axis of rotation. This can result in fewer unwanted background noises than with larger degrees of freedom.

[0025] It may also be provided that the moving body has one or more stop knobs on its upper side facing the upper stop and / or on its lower side facing the lower stop.

[0026] According to one embodiment of the invention, the main body of the plunger and / or the housing can incorporate soft components to dampen impact noises when the rest position and / or the actuation position are reached. This reduces impact noises of the plunger against the housing during actuation and emphasizes the impact noise, and thus the desired click sound, during actuation. This gives the key module a distinctive sound.

[0027] It may also be designed that the housing incorporates soft components on its exterior for acoustic decoupling from a keyboard housing in which the key module is installed, and / or from a keyboard circuit board. This means that the acoustic sound is predominantly generated by the key modules and less by the keyboard housing and / or the keyboard circuit board, resulting in a specific sound.

[0028] The contact piece and contact transmitter can have one or more crossbar contacts to form their electrical contact.

[0029] The keyboard according to the invention comprises one or more key modules according to the invention.

[0030] The invention is further explained below with regard to other features and advantages by means of a description of exemplary embodiments and with reference to the accompanying schematic drawings.

[0031] This shows Fig. 1 and Fig. 2 Two perspective exploded views of an embodiment of a keypad module according to the invention from different viewing angles, Fig. 3, Fig. 4, Fig. 5 to Fig. 6 in sectional views, the keyboard module after Fig. 1 in different states of motion, Fig. 7 and Fig. 8. Push the plunger of the key module towards Fig. 1 in two different perspective representations, in Fig. 7 composed and in Fig. 8 as an exploded view, Fig. 9 and Fig. 10 the main body of the pestle after Fig. 7 in perspective drawings with different viewpoints, and Fig. 11 and Fig. 12 the moving body of the plunger after Fig. 7 in perspective drawings with different viewpoints.

[0032] Corresponding parts and components are marked with the same reference symbols in all figures.

[0033] Fig. 1 and Fig. Figure 2 shows an embodiment of a keypad module 10 according to the invention in perspective exploded views. The keypad module 10 comprises a housing 11, which consists of a first housing part 13, an upper part, and a second housing part 14, a lower part.

[0034] Furthermore, the key module comprises a movement mechanism 15 with a plunger 16 and a return spring 17, wherein the plunger (16) is movable relative to the housing 11 between a rest position and an actuation position.

[0035] Fig. 3 to Fig. Section 6 shows the keyboard module 10 in different movement states:

[0036] Fig. Figure 3 shows the rest position in which no actuation takes place, i.e. the plunger 16 is pressed against the first housing part 13 by the return spring 17.

[0037] Fig. 4 and Fig. Figure 5 shows two successive movement states when the key module 10 is activated from the rest position towards the activation position.

[0038] Fig. Figure 6 shows the actuation position in which the plunger 16 is pressed against the restoring force emanating from the return spring 17 until it reaches a stop.

[0039] The keypad module 10 further comprises a contact piece 18 fixed in the housing 11 and a contact element 19 made of a U-shaped bent contact spring material with a first leg 20 and a second leg 21, wherein the first leg 20 is fixed in the housing 11 and the second leg 21 is freely arranged opposite the contact piece 18 in the housing 11. The contact piece 18 and the contact element 19 interact to form an electrical contact, such that in the actuating position of the plunger 16, the second leg 21 of the contact element 19 is biased against its first leg 20 and rests against the contact piece 18, and in the rest position of the plunger 16, the second leg 21 of the contact element 19 is lifted away from the contact piece 18 against the bias by the plunger 16, thus interrupting the electrical contact.

[0040] Fig. 7 to Fig. 12 show in addition to Fig. 1 to Fig. Figure 6 shows the plunger 16 and its components in various views. The plunger 16 comprises a main body 22, which performs the intended movement of the plunger 16 in connection with the key actuation, and a moving body 23. The main body 22 has a bottom surface 24 and a top surface 25 opposite the bottom surface 24 in the direction of actuation, and a recess 26 laterally between the bottom surface 24 and the top surface 25. The moving body 23 is inserted into the recess 26 and is rotatably mounted on a base 28 of the recess 26 opposite an opening 27 of the recess 26 about an axis of rotation 29 perpendicular to an intended direction of movement 30 of the main body 22, which is indicated by a double arrow 30.

[0041] The recess 26 defines a movement space 31 for the moving body 23 with an upper stop 32 on the side of the top 25 of the main body 22 and a lower stop 33 on the side of the bottom 24 of the main body 22. In this movement space 31, the moving body 23 is rotatable between the upper stop 32 and the lower stop 33.

[0042] The plunger 16 rests against the second leg 21 of the contactor 19 via its moving body 23 to lift the second leg 21 from the contact piece 18. The moving body 23 has a guide profile 34 that interacts with a control profile 35 of the second leg 21. The control profile 35 of the second leg 21 includes a control cam 36 that projects towards the guide profile 34 of the moving body 23. The guide profile 34 forms a projection 37 and, on the side of the projection 37 facing the underside 24 of the main body 22, a recess 38.

[0043] In the rest position of the plunger 16, the moving body 23 rests against the lower stop 33, the control cam 36 rests in the recess 38 on the moving body 23, and the second leg 21 of the contactor 19 is lifted against the preload from the contact piece 18, thus interrupting the electrical contact. This is in Fig. 3 shown.

[0044] When the plunger 16 moves from its rest position towards its actuating position, the moving body 23 is initially moved towards the upper stop 32. The control cam 36 remains in the recess 38 on the moving body 23, and the second leg 21 of the contactor 19 remains lifted against the preload from the contact piece 18, so that the electrical contact remains interrupted. With further movement of the plunger 16, the moving body 23 initially rests against the upper stop 32, and the control cam 36 slides out of the recess 38 to a vertex 39 of the projection 37. The second leg 21 of the contactor 19 remains lifted against the preload from the contact piece 18, so that the electrical contact remains interrupted. This is in Fig. 4 shown.

[0045] Subsequently, the control cam 36 passes the apex 39 of the projection 37. This causes the moving body 23 to be abruptly moved to the lower stop 33, generating a clanging sound. Simultaneously, the guide profile 34 following the apex 39 of the projection 37 releases the control cam 36, so that the second leg 21 of the contact element 19 rests against the contact piece 18 due to the preload, thus closing the electrical contact. This is in Fig. 5 shown.

[0046] As the plunger 16 moves further, it reaches its stop and thus assumes its final actuation position. This is in Fig. 6 shown.

[0047] During the aforementioned sliding of the control cam 36 out of the recess 38 to the apex 39 of the projection 37, the second leg 21 is additionally pressed against the preload by the first leg 20, which requires an increasing force when actuating the plunger 16. This force is no longer required after passing the apex 39 of the projection 37, so that passing the apex 39 of the projection 37 simultaneously with the closing of the electrical contact and the emission of the impact noise produces a tactilely perceptible pressure point effect.

[0048] During the reverse movement of the plunger 16 from the actuating position towards the rest position, the initially released control cam 36 contacts the guide profile 34. With further movement of the plunger 16, the control cam 36 is pressed by the guide profile 34 against the preload, so that the second leg 21 of the contactor 19 lifts off the contact piece 18 and thus the electrical contact is interrupted.

[0049] The moving body 23 arranged in the recess 26 of the main body 22 of the plunger 16 has only one rotational degree of freedom about the aforementioned axis of rotation 29.

[0050] The moving body 23 has one or more stop knobs 42 on its upper side 40 facing the upper stop 32 and / or on its lower side 41 facing the lower stop 33.

[0051] Contact piece 18 and contact transmitter 19 have cross-rail contacts 43 to form their electrical contact.

[0052] The invention thus proposes, in particular, a keypad module comprising a base as the lower housing part, a cover as the upper housing part, a contact transmitter, a contact element, a return spring, and a two-part plunger. The plunger comprises, as its main body, a support part and, as its moving part, a rotatably mounted clicker.

[0053] The advantage of the new concept is that the clicker is mounted exclusively on the plunger and does not come into contact with other housing parts.

[0054] The clicker is rotatably attached to the plunger's support bracket and can rotate within a sector of the bracket's angle. Because the rotation is small and the axis of rotation generates relatively little friction, the overall friction balance is very favorable. The clicker has two stops: one at the top of the angle sector and one at the bottom.

[0055] In its resting position, the clicker is rotated clockwise to the lower stop. The control cam of the contactor is located in the recess of the clicker's guide profile. The contactor is elastically deformed, interrupting the electrical contact between the contactor and the contact piece.

[0056] When activated, the clicker initially rotates counterclockwise around its axis of rotation until it reaches the upper stop on the carrier part of the plunger, additionally deflecting the contactor and generating a noticeable increase in force on the plunger.

[0057] After passing the apex of the guide profile, the kicker, due to the pre-tensioned spring of the contact switch, abruptly rotates in the opposite direction until it reaches the lower stop on the plunger's support bracket, generating an impact noise. The contact switch is then released, and the electrical contacts close. An electrical signal is generated when the contacts close. During the switching process, the resistance on the plunger also decreases abruptly. This creates a tactile feedback that is clearly perceptible. Thus, the electrical signal, tactile feedback, and acoustic feedback are interconnected in a specific sequence.

[0058] After the switching process, the plunger can be actuated further. During this time, the plunger with its carrier and clicker, and the contactor, remain mechanically decoupled. The return spring, which is pre-tensioned between the base and the plunger, is further compressed. The return spring defines a specific force-displacement curve. The end stop occurs between the plunger and the base.

[0059] Since the clicker only has one rotational degree of freedom, significantly less negative background noise is produced.

[0060] The intensity of the impact noise depends on the clicker's rotation angle, its weight, the position of the contact surfaces, and the strength of the contact spring, and can be adjusted as desired. The travel distance, or force-displacement curve, can be adjusted as desired by the clicker's rotation angle and guide profile.

[0061] During downshifting, the plunger with the clicker moves upwards due to the spring force of the return spring until it reaches the point of contact between the control cam of the contactor and that of the clicker. The contactor is then deflected to the right by the angle of the clicker, and the contacts are broken. The contactor's bending spring is compressed in the process.

[0062] The clicker is in the clockwise rotated position. The angle of the ramp is therefore reduced by the amount of the rotation compared to the actuation position. This results in a significantly lower return force than with a linearly sliding clicker with the same angle of ramp. This makes the return action more reliable and allows the use of weaker return springs.

[0063] The return movement ends in the rest position. In this position, the control cams of the contactor are once again caught in the recess of the clicker's guide profile.

[0064] The plunger can also include soft components for the stop in the rest position and / or end position. This reduces impact noise during actuation and emphasizes the click sound, giving the switch a distinctive sound.

[0065] The base and / or lid may also contain a soft component to minimize impact noise.

[0066] The base can also be decoupled from the keyboard housing (frame, PCB) using soft components. This means that the acoustic sound is primarily generated by the keycap and less by the keyboard housing, resulting in a specific sound. Reference symbol list 10-key module 11 cases 13 first housing part 14 second housing part 15 Movement mechanism 16 pestles 17 Return spring 18 contact pieces 19 contact persons 20 first leg of the contactor 19 21 second limb of the contactor 19 22 Main body of the pestle 16 23 Moving body of the plunger 16 24 Underside of the main body 22 25 Top of the main body 22 26. Cutout in the main body 27 Opening of the recess 26 28 Bottom of the recess 26 29 axis of rotation 30 intended direction of movement of the main body 22 31 Movement space in the recess 26 32 upper stop 33 lower stop 34 Guide profile of the moving body 23 35 Tax profile of the second leg 21 36 Tax cam of the tax profile 35 37 Advantage of the leadership profile 34 38 Trough of the guide profile 34 39 Peak of the lead 37 40 Top of the moving body 23 41 Underside of the moving body 23 42 impact studs 43 Crossbar contact QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 32 29 465 A1

[0006] CN 116259490 A

[0006] CN 108231467 A

[0006] CN 203386635 U

[0006] CN 208226984 U

[0006] CN 208241649 U

[0006] CN 213988686 U

[0006] CN 216871803 U

[0006] EP 3794 623 B1

[0006] US 5,372,442

[0006]

Claims

[1] Key module (10) include a case (11), a movement mechanism (15) comprising a plunger (16) and a return spring (17), wherein the plunger (16) is movable relative to the housing (11) between a rest position and an actuating position, a contact piece (18) fixed in the housing (11), and a contact element (19) made of a U-shaped bent contact spring material with a first leg (20) and a second leg (21), wherein the first leg (20) is fixed in the housing (11) and the second leg (21) is arranged freely in the housing (11) opposite the contact element (18), wherein contact piece (18) and contact transmitter (19) cooperate in forming an electrical contact, in that in the actuating position of the plunger (16) the second leg (21) of the contact transmitter (19) is biased against its first leg (20) against the contact piece (18) and in the rest position of the plunger (16) the second leg (21) of the contact transmitter (19) is lifted by the plunger (16) against the bias from the contact piece (18) and thus the electrical contact is interrupted, characterized by , that the plunger (16) has a main body (22) which executes the movement of the plunger (16) and a moving body (23), wherein the main body (22) has a bottom (24) and a top (25) opposite the bottom (24) in the direction of actuation and a recess (26) laterally between the bottom (24) and the top (25), into which the moving body (23) is inserted and is rotatably mounted on a base (28) of the recess (26) opposite an opening (27) of the recess (26) about an axis of rotation (29) perpendicular to a provided direction of movement (30) of the main body (22), wherein the recess (26) defines a movement space (31) for the moving body (23) with an upper stop (32) on the side of the top (25) of the main body (22) and a lower stop (33) on the side of the bottom (24) of the main body (22), in which the moving body (23) is rotatable between the upper stop (32) and the lower stop (33), wherein the plunger (16) for lifting the second leg (21) of the contactor (19) from the contact piece (18) rests against the second leg (21) via its moving body (23), wherein the moving body (23) has a guide profile (34) which interacts with a control profile (35) of the second leg (21), wherein the control profile (35) of the second leg (21) comprises a control cam (36) which protrudes towards the guide profile (34) of the moving body (23), wherein the guide profile (34) forms a projection (37) and on the side of the projection (37) facing the underside (24) of the main body (22) a recess (38), wherein in the rest position of the plunger (16) the moving body (23) rests against the lower stop (33) and the control cam (36) rests in the recess (38) on the moving body (23) and the second leg (21) of the contactor (19) is lifted against the preload from the contact piece (18) and thus the electrical contact is interrupted, wherein when the plunger (16) moves from the rest position towards the actuating position, the moving body (23) is first moved towards the upper stop (32) and the control cam (36) continues to rest in the recess (38) on the moving body (23) and the second leg (21) of the contactor (19) continues to be lifted against the preload from the contact piece (18) and thus the electrical contact remains interrupted, as the plunger (16) continues to move, the moving body (23) initially rests against the upper stop (32) and the control cam (36) slides out of the recess (38) to a vertex (39) of the projection (37), and subsequently the control cam (36) passes over the vertex (39) of the projection (37), thereby abruptly moving the moving body (23) to the lower stop (33) and generating a striking noise, and simultaneously the guide profile (34) following the vertex (39) of the projection (37) releases the control cam (36), and thus the second leg (21) of the contactor (19) rests against the contact piece (18) due to the preload and the electrical contact is closed. [2] Keypad module (10) according to claim 1, characterized by, that when the control cam (36) slides out of the recess (38) to the apex (39) of the projection (37), the second leg (21) is additionally pressed against the preload by the first leg (20), which requires an increasing force when actuating the plunger (16), which is eliminated after passing the apex (39) of the projection (37), so that passing the apex (39) of the projection (37) simultaneously with the closing of the electrical contact and the emission of the impact noise causes a tactilely perceptible pressure point effect. [3] Keypad module (10) according to claim 1 or 2, characterized by, that when the plunger (16) moves from the actuating position towards the rest position, the initially released control cam (36) contacts the guide profile (34) and then, with further movement of the plunger (16), is pressed by the guide profile (34) against the preload, so that the second leg (21) of the contactor (19) is lifted from the contact piece (18) and thus the electrical contact is interrupted. [4] Keypad module (10) according to any of the preceding claims, characterized by , that the moving body (23) in the recess (26) of the main body (22) of the plunger (16) has only one rotational degree of freedom about the said axis of rotation (29). [5] Keypad module (10) according to any of the preceding claims, characterized by , that the moving body (23) has one or more stop knobs (42) on its upper side (40) facing the upper stop (32) and / or on its lower side (41) facing the lower stop (33). [6] Keypad module (10) according to any of the preceding claims, characterized by , that the main body (22) of the plunger (16) and / or the housing (11) has soft components to dampen impact noises when reaching the rest position and / or the actuating position. [7] Keypad module (10) according to any of the preceding claims, characterized by , that the housing (11) has soft components on its outside for acoustic decoupling from a keyboard housing in which the key module (10) is installed, and / or from a keyboard circuit board. [8] Keypad module (10) according to any of the preceding claims, characterized by , that the contact piece (18) and contact transmitter (19) have one or more cross-rail contacts (43) to form their electrical contact. [9] Keyboard comprising one or more key modules (10) according to any of the preceding claims.

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