CN214012803U - Sound switch, input device and keyboard - Google Patents

Abstract

The utility model provides a switch makes a sound. The sound switch comprises a shell with an accommodating space, a pressing body and a variable capacitor, wherein the pressing body and the variable capacitor are accommodated in the accommodating space. The pressing body comprises a first assembly and a second assembly, the first assembly comprises a corresponding L-shaped clamping hook and a limiting protruding block, the second assembly comprises a retaining wall, the retaining wall comprises a first sliding groove and an abutting notch, the L-shaped clamping hook slides along the first sliding groove, and therefore the abutting notch is in reciprocating movement between the L-shaped clamping hook and the limiting protruding block. The variable capacitor comprises a first electrode and a second electrode which are oppositely arranged at intervals in a coupling mode, wherein the first electrode comprises an arc-shaped abutting end and elastically abuts against the protrusion and the recess of the retaining wall. The utility model provides a sound switch with paragraph sense, reduction electrode loss still provides an input device and keyboard that adopt above-mentioned sound switch simultaneously.

Description

Sound switch, input device and keyboard

Technical Field

The present invention relates to a sound switch, and more particularly to a sound switch, an input device and a keyboard for a capacitive mechanical key as an input system.

Background

With the development of modern electronic technology, electronic products gradually go deep into the lives of people, and various electronic products such as telephones, mobile phones, notebook computers, remote controllers and the like accompany the daily lives of people.

The role played by the input device of the electronic product is particularly important. The key switch adopted in the prior art mainly adopts a contact switch as a switch element, and when the key moves downwards in the pressing process, pressure is applied to the contact switch to drive two electrodes of the contact switch to be mutually conducted, so that a physical and mechanical input signal is converted into an electronic input signal, and the input action is realized.

However, the above design still has the following drawbacks:

firstly, the feeling of paragraphs is poor;

secondly, when the contact switch is turned on but the pressure applied to the key is not yet finished, two electrodes of the contact switch are continuously pressed, and the loss of the contact switch is accelerated.

Therefore, it is necessary to provide a sound switch to solve the above-mentioned problems of bad hand feeling and serious electrode loss.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems that the touch switch in the prior art is not good in hand feeling and the electrode loss is serious, the utility model provides a sound switch with paragraph feeling and electrode loss reduction. Simultaneously, an input device and a keyboard adopting the sound switch are also provided.

The utility model provides a sounding switch, including the casing, the pressing body, the variable capacitance who possesses accommodating space, press the body with the variable capacitance accept in the accommodating space, press the body including first assembly and utensil hollow structure's second assembly, first assembly runs through hollow structure, first assembly includes the L shape pothook and the spacing lug that set up correspondingly, second assembly includes the barricade, the barricade includes first spout and butt breach, the butt breach is located first spout one end, L shape pothook follows the first spout slides, thereby the butt breach is in L shape pothook with reciprocating motion between the spacing lug, the variable capacitance includes relative interval coupling set up first electrode and second electrode, the second electrode locate the second assembly with between the first electrode, the first electrode comprises an arc-shaped abutting end, the retaining wall of the second group body faces the side wall of the arc-shaped abutting end and is provided with a first inclined plane, a second inclined plane and a third inclined plane, the first inclined plane is smoothly connected with the second inclined plane to form a bulge, the second inclined plane is smoothly connected with the third inclined plane to form a recess, and the arc-shaped abutting end is convexly abutted with the recessed elastic abutting end.

In a preferred embodiment of the acoustic switch provided in the present invention, the first electrode is made of an elastic conductive material.

In a preferred embodiment of the loud switch provided by the present invention, the second electrode includes an insulating layer disposed between the first electrode and the second electrode.

In a preferred embodiment of the loud switch, the loud switch further comprises a capacitor circuit, the capacitor circuit comprises a fixed capacitor or a plurality of fixed capacitors, the fixed capacitor or the plurality of fixed capacitors is connected in series with the first electrode and the variable capacitor formed by the coupling of the second electrode, and the plurality of fixed capacitors are connected in series or in parallel with the output capacitor.

In a preferred embodiment of the sound switch provided by the present invention, the capacitor circuit comprises a plurality of branches, each branch is connected in series with the variable capacitor formed by the coupling of the first electrode and the second electrode, each branch comprises at least one branch switch, and the branch switch is closed or disconnected to make the capacitor circuit output corresponds to the set capacitance value.

In a preferred embodiment of the loud switch provided by the present invention, the first assembly further comprises a lead column, a second bottom wall and two opposite side walls, wherein the two side walls are perpendicularly connected to the second bottom wall and located at the same side of the second bottom wall, and the lead column extends out of the center of the second bottom wall. The limit lug is arranged at the joint of the side wall and the second bottom wall, the L-shaped hook is arranged opposite to the lead column at intervals, and the L-shaped hook is an L-shaped structure extending from the second bottom wall.

The utility model provides a preferred embodiment of a sound switch, the casing includes upper cover and base, the upper cover with the base encloses through buckle structure and becomes accommodating space, the base includes first diapire, first diapire center department is equipped with the helical pitch pipe, the helical pitch pipe is acceptd the helical pitch post, the helical pitch pipe with the one end that first diapire meets is sealed and is set up.

The utility model provides a preferred embodiment of the switch makes a sound, the switch makes a sound still includes the elastomer, the elastomer cover is located the helical pitch pipe outside, press from both sides and locate the second diapire with between the first diapire.

An input device comprises a sound switch, a capacitance detection module and a control module, wherein the sound switch receives a physical pressing signal and correspondingly feeds back a capacitance change signal, the capacitance detection module receives the capacitance change signal from the sound switch and judges the working state of the sound switch to generate a working state signal, the control module receives the working state signal from the capacitance detection module and correspondingly generates an input signal, the sound switch comprises a shell with a containing space, a pressing body and a variable capacitor, the pressing body and the variable capacitor are contained in the containing space, the pressing body comprises a first body and a second body with a hollow structure, the first body penetrates through the hollow structure, the first body comprises an L-shaped hook and a limit protruding block which are correspondingly arranged, and the second body comprises a retaining wall, the barricade includes first spout and butt breach, the butt breach is located first spout one end, L shape pothook is followed first spout slides, thereby the butt breach is in L shape pothook with reciprocating motion between the spacing lug, variable capacitance includes first electrode and the second electrode that the relative interval coupling set up, the second electrode is located the second stack body with between the first electrode, the first electrode includes arc butt end, the barricade orientation of the second stack body the lateral wall of arc butt end is equipped with first inclined plane, second inclined plane and third inclined plane, first inclined plane with second inclined plane smooth phase meets and forms protrudingly, the second inclined plane with third inclined plane smooth phase meets and forms sunkenly, the arc butt end with protruding with sunken elasticity butt.

A keyboard comprises a circuit board, a capacitance detection module, a sound switch and a control module, wherein the sound switch is arranged in the circuit board, the capacitance detection module is arranged in the circuit board and is electrically connected with the sound switch, the control module correspondingly generates an input signal according to a detection result of the capacitance detection module, the sound switch comprises a shell with an accommodating space, a pressing body and a variable capacitor, the pressing body and the variable capacitor are accommodated in the accommodating space, the pressing body comprises a first body and a second body with a hollow structure, the first body penetrates through the hollow structure, the first body comprises an L-shaped clamping hook and a limiting protruding block which are correspondingly arranged, the second body comprises a retaining wall, the retaining wall comprises a first sliding groove and a butt notch, and the butt notch is arranged at one end of the first sliding groove, the L-shaped hook slides along the first sliding groove, so that the butt notch is in reciprocating movement between the L-shaped hook and the limiting protruding block, the variable capacitor comprises a first electrode and a second electrode which are arranged in a relatively spaced coupling mode, the second electrode is arranged between the second assembly and the first electrode, the first electrode comprises an arc butt end, a retaining wall of the second assembly faces the side wall of the arc butt end and is provided with a first inclined surface, a second inclined surface and a third inclined surface, the first inclined surface is smoothly connected with the second inclined surface to form a bulge, the second inclined surface is smoothly connected with the third inclined surface to form a recess, and the arc butt end is elastically abutted against the bulge and the recess.

Compared with the prior art, the utility model provides a sound switch has better paragraph and feels, when pressing the body and receiving external physics effort to push down, the elastic coefficient of elastomer is unchangeable, the pressure stroke curve of sound switch is a class straight line, works as the second stack body transmits pressure for the arc butt end of first electrode, the arc butt end certainly the second inclined plane with when the level and smooth of third inclined plane meets and forms sunken roll-off, first electrode adopts the processing of elasticity conducting material to form, can produce a jump on pressure formation curve, produces the paragraph and feels.

After the arc-shaped abutting end is smoothly connected with the third inclined surface from the second inclined surface to form a recess and slide out, the first electrode is abutted to the second electrode and is not influenced by external physical acting force any more, and the loss of the electrodes is reduced.

In addition, after the arc-shaped abutting end smoothly connects with the third inclined surface from the second inclined surface to form a concave sliding-out, the second group body falls down under the action of gravity and collides with the L-shaped clamping hook to make a crisp sound, so that the input prompting function is realized.

And thirdly, the joint arrangement of the variable capacitor and the capacitor circuit reduces the requirement of the sound switch on the contact sensitivity between the first electrode and the second electrode, reduces the production cost, improves the input precision and prolongs the service life of the sound switch.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is a schematic perspective view of a keyboard according to the present invention;

fig. 2 is a schematic view of a three-dimensional assembly structure of a sound switch of the present invention;

FIG. 3 is an exploded perspective view of the loud switch of FIG. 2;

FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a schematic structural view of a pressing body of the loud switch shown in FIG. 2;

FIGS. 6a and 6b are side cross-sectional views of the loud switch of FIG. 2 in two operating states, i.e., non-activated and activated, respectively;

fig. 7 is a block diagram of an input device according to the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Please refer to fig. 1, which is a schematic perspective view of a keyboard according to the present invention. The keyboard 20 comprises a plurality of array-arranged sound switches 10, a fixing plate 23, a circuit board 24, a capacitance detection module 26 and a control module 28. The acoustic switch 10 is arranged on the circuit board 24, the capacitance monitoring module 26 is arranged on the circuit board 24 and electrically connected with the acoustic switch 10, and the control module 28 correspondingly generates an input signal according to the detection result of the capacitance monitoring module 26. The fixing plate 23 includes a plurality of first through holes 231, and the circuit board 24 includes a plurality of second through holes 241. The fixing plate 23 and the circuit board 24 are oppositely arranged at intervals, and the sound switch 10 is correspondingly inserted through the first through hole 231 of the fixing plate 23 and the second through hole 241 of the circuit board 24, and is clamped and fixed with the fixing plate 23 and the circuit board 24.

Please refer to fig. 2 and fig. 3, wherein fig. 2 is a schematic perspective assembly structure of a sound switch according to the present invention, and fig. 3 is a schematic perspective exploded view of the sound switch shown in fig. 2. The ringing switch 10 includes a housing 11, a pressing body 12, an elastic body 14, a variable capacitor 16, and a capacitor circuit 18. The housing 11 has a housing space in which the pressing body 12, the elastic body 14, and the variable capacitor 16 are housed, and the capacitor circuit 18 is provided in the circuit board 24 and is provided in series with the variable capacitor 16.

The housing 11 includes an upper cover 111 and a base 113, and the upper cover 111 and the base 113 enclose the accommodating space through a snap structure. The upper cover 111 includes a lead through hole 1111, and one end of the pressing body 12 penetrates the lead through hole 1111. The base 113 includes a first bottom wall 1131, four side walls 1132 and a lead pipe 1135, and the first bottom wall 1131 and the side walls 1132 are connected to each other. Four lateral walls 1132 is end to end in proper order, and two liang are relative, and locate same one side of first diapire 1131, helical pitch pipe 1135 is located first diapire 1131 center department, with the one end that first diapire 1131 meets seals the setting, and wherein two are relative lateral wall 1132 is equipped with rectangular shape second spout 11321 between two parties.

Please refer to fig. 4 and 5, wherein fig. 4 is a cross-sectional view taken along IV-IV of fig. 2, and fig. 5 is a schematic structural diagram of the pressing body of the acoustic switch shown in fig. 2. The pressing body 12 includes a first body 121 and a second body 123 having a hollow structure, the first body 121 penetrates the hollow structure, and one end of the first body 121 penetrates the lead through hole 1111.

The first assembly 121 includes a pressing end 1211, a second bottom wall 1212, two opposite side walls 1214, an L-shaped hook 1216, a limiting protrusion 1217 and a guiding column 1219, wherein the pressing end 1211 protrudes out of the guiding through hole 1111, the two side walls 1214 and the second bottom wall 1212 are perpendicularly connected to each other and are located on the same side of the second bottom wall 1212, and the guiding column 1219 is a cylindrical structure extending from the center of the second bottom wall 1212. The limiting protrusion 1217 is disposed at a position where the side wall 1214 and the second bottom wall 1212 meet, the L-shaped hook 1216 is disposed opposite to the lead post 1219 at an interval, the L-shaped hook 1216 is an L-shaped structure extending from the second bottom wall 1212, and the limiting protrusion 1217 and the L-shaped hook 1216 are disposed correspondingly. The lead column 1219 is housed in the lead tube 1135.

The second set 123 includes the barricade 1231, the barricade 1231 includes first spout 12315, butt breach 12311 and slider 12313, the barricade 1231 orientation the internal surface at the second set 123 center is equipped with first spout 12315, butt breach 12311 is located first spout 12315 is close to the one end of second diapire 1212, with the internal surface is relative the surface of barricade 1231 is equipped with slider 12313. The L-shaped hook 1216 slides along the first sliding groove 12315, so that the abutting notch 12311 reciprocates between the L-shaped hook 1216 and the limit projection 1217, and the slider 12313 slides along the second sliding groove 11321.

The elastic body 14 is a metal spring, and is sleeved outside the lead pipe 1135 and sandwiched between the second bottom wall 1212 of the first assembly 121 and the first bottom wall 1131 of the base 113. Of course, as a further improvement of the above embodiment, the elastic body 14 is not limited to a metal spring, but may be other elastic materials, and all that is achieved to elastically support the pressing body 12 to move along the vertical direction within the set stroke range belongs to the creation purpose of the present invention.

The variable capacitor 16 is arranged in series with the capacitor circuit 18 and includes a first electrode 161 and a second electrode 163 coupled and arranged in opposing spaced apart relation. The first electrode 161 is formed by processing an elastic conductive material, the first electrode 161 is connected in series with the second electrode 163, and the second electrode 163 is disposed between the second assembly 123 and the first electrode 161. One end of the first electrode 161 penetrates through the first bottom wall 1131 and is welded and fixed to the circuit board 24, the other end of the first electrode 161 is provided with an arc abutting end 1611, the arc abutting end 1611 and the movable electrode plate 1613 are of an integral structure, the retaining wall 1231 of the second assembly 123 faces the side wall of the arc abutting end 1611 and is provided with a first inclined surface 12314, a second inclined surface 12316 and a third inclined surface 12318, the first inclined surface 12314 and the second inclined surface 12316 are smoothly connected to form a protrusion, the second inclined surface 12316 and the third inclined surface 12318 are smoothly connected to form a recess, and the arc abutting end 1611 is elastically abutted against the protrusion and the recess. One end of the second electrode 163 penetrates through the first bottom wall 1131 and is fixed to the circuit board 24 by welding, and the other end is provided with an insulating layer 1631, and the insulating layer 1631 is arranged between the first electrode 161 and the second electrode 163. In this embodiment, the insulating layer 1631 is adhered to the surface of the second electrode 163, but other arrangements are also possible, as long as the insulating layer is sandwiched between the first electrode 161 and the second electrode 163, and any design for preventing short circuit when the two are close to each other is feasible.

When the capacitance existing between the first electrode 161 and the second electrode 163 is set to C, the capacitance of the variable capacitor 16 can be changed by changing the facing area and the distance between the first electrode 161 and the second electrode 163.

When an external physical force acts on the pressing end 1211, the pressing end 1211 moves down along the lead through hole 1111, the lead column 1219 moves down along the lead pipe 1135 to compress the elastic body 14, the L-shaped hook 1216 slides down along the first sliding groove 12315 of the retaining wall 1231, and the limit protrusion 1217 moves towards the abutting notch 12311; when the limit protrusion 1217 abuts against the abutment notch 12311, the pressing end 1211 moves downward continuously to transmit the acting force to the second assembly 123, the slider 12313 slides downward along the second sliding slot 11321, the first inclined surface 12314, the second inclined surface 12316 and the third inclined surface 12318 move downward to transmit the pressure to the arc-shaped abutment end 1611, the arc-shaped abutment end 1611 slides out of the second inclined surface 12316 and smoothly contacts with the third inclined surface 12318 to form a recess, the first electrode 161 abuts against the insulating layer 1631 of the second electrode 163, and the capacitance between the first electrode 161 and the second electrode 163 is C1, i.e., the capacitance of the variable capacitor 16 is C1. Meanwhile, the second assembly 123 falls down due to the gravity, the sliding block 12313 slides down along the second sliding groove 11321, and the abutting notch 12311 collides with the L-shaped hook 1216 to make a crisp sound.

When the external physical force is removed, the elastic body 14 is deformed by itself, so as to push the first assembly 121 to move upward, the pressing end 1211 moves upward along the lead through hole 1111, the lead column 1219 moves upward along the lead tube 1135, the L-shaped hook 1216 slides upward along the first sliding slot 12315 of the retaining wall 1231, so as to drive the second assembly 123 to move upward, the slider 12313 slides upward along the second sliding slot 11321, the first inclined surface 12314, the second inclined surface 12316 and the third inclined surface 12318 move upward, and abut against the arc abutting end 1611, so as to reset the arc abutting end 1611, the first electrode 161 is separated from the insulating layer 1631 of the second electrode 163, and the capacitance value between the first electrode 161 and the second electrode 163 is C2, i.e., the capacitance value C of the variable capacitor 16 is C2.

By pressing the pressing body 12 with or without applying an external force, the capacitance value C of the variable capacitor 16 is correspondingly changed between C1 and C2.

The capacitance circuit 18 is connected in series with the variable capacitance 16 formed by coupling the first electrode 161 and the second electrode 163. In this embodiment, the capacitor circuit 18 is a fixed capacitor, as a further improvement of this embodiment, the capacitor circuit 18 may further include multiple fixed capacitors, the multiple fixed capacitors are connected in series or in parallel, the fixed capacitor or the multiple fixed capacitors are connected in series with the variable capacitor 16 formed by coupling the first electrode 161 and the second electrode 163, multiple branches may be formed, each branch is connected in series with the variable capacitor 16 formed by coupling the first electrode 161 and the second electrode 163, each branch includes at least one branch switch, and the branch switch may be closed or opened to enable the capacitor circuit 18 to output a corresponding set capacitance value.

When the capacitance value of the capacitor circuit 18 is set to C0, the capacitance value Cx of the branch formed by the variable capacitor 16 and the capacitor circuit 18 in series is C1C 0/(C1+ C0) when the pressing body 12 is pressed; when the external force is removed and the pressing body 12 does not trigger the variable capacitor 16, the capacitance value of the variable capacitor 16 is C2, and the capacitance value Cx of the branch formed by the variable capacitor 16 and the capacitor circuit 18 in series is C2C 0/(C2+ C0).

Referring to fig. 6a and fig. 6b, which are side sectional views of the acoustic switch 10 shown in fig. 2 in two working states, i.e., the acoustic switch 10 is in an activated state and an inactivated state, respectively, in this embodiment, the capacitance value of the variable capacitor 16 is switched between C1 and C2, so that the capacitance value Cx of the branch formed by the variable capacitor 16 and the capacitor circuit 18 connected in series is greatly changed. Based on the change of the capacitance value, the operating state of the ringing switch 10 is determined, specifically, when the pressing body 12 is pressed, the capacitance value Cx of the branch formed by the variable capacitor 16 and the capacitor circuit 18 in series is C1 × C0/(C1+ C0), and the ringing switch 10 is in the activated state; when the pressing body 12 is not pressed or the pressure is released, the capacitance value Cx ═ C2 ═ C0/(C2+ C0) of the branch formed by the variable capacitance 16 in series with the capacitance circuit 18, and the ringing switch 10 is in an inactivated state.

Compared with the prior art, the utility model provides a switch 10 makes a sound has better paragraph and feels, press the body 12 when being pushed down by external physics effort, the elastic coefficient of elastomer 14 is unchangeable, switch 10 makes a sound's pressure stroke curve is a class straight line, works as the second group body 123 transmits pressure for the arc butt end 1611 of first electrode 161, arc butt end 1611 certainly second inclined plane 12316 with when third inclined plane 12318 smooth phase meets and forms sunken roll-off, first electrode 161 adopts the processing of elasticity conducting material to form, can produce a jump on pressure formation curve, produces the paragraph and feels.

After the arc-shaped abutting end 1611 smoothly meets the second inclined surface 12316 and the third inclined surface 12318 to form a recess and slide out, the first electrode 161 abuts against the second electrode 163, and is not affected by external physical force any more, so that the loss of the electrodes is reduced.

In addition, after the arc-shaped abutting end 1611 smoothly connects with the second inclined surface 12316 and the third inclined surface 12318 to form a recess and slide out, the second assembly 123 falls due to gravity and collides with the L-shaped hook 1216 to generate a crisp sound, thereby having an input prompting function.

Thirdly, the variable capacitor 16 and the capacitor circuit 18 are jointly arranged, so that the requirement on the contact sensitivity between the first electrode 161 and the second electrode 163 of the ringing switch 10 is reduced, the production cost is reduced, the input precision is improved, and the service life of the ringing switch 10 is prolonged.

Please refer to fig. 7, which is a block diagram of an input device according to the present invention. The input device 30 includes a sound switch 31, a capacitance detection module 33 and a control module 35.

The ringing switch 31 receives the physical pressing signal and corresponds to the feedback capacitance change signal.

The capacitance detection module 33 detects a capacitance change signal of the loud switch 31, and determines a working state of the loud switch 31 according to a capacitance change result, specifically, the loud switch 31 includes an activated working state and an inactivated working state, and when the loud switch 31 is pressed, the loud switch is correspondingly in the activated state, and when the loud switch 31 is not pressed, the loud switch is correspondingly in the inactivated state.

The control module 35 receives the judgment result from the capacitance detection module 33, and generates an input signal according to the working state of the ringing switch 31. Specifically, when the input device 30 is a keyboard, the operator intends to input the letter a. When the key a is pressed, the capacitance value of the ringing switch 31 corresponding to the key a is increased; correspondingly, the capacitance detection module 33 judges that the sound switch 21 is in an activated state according to the capacitance change value; the control module 25 generates a control signal for inputting the letter a according to the activation state of the ringing switch 21, so as to realize the input operation of the letter a.

In the input device 30, the loud switch 31 is the loud switch 10 disclosed in the first embodiment.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a switch makes a sound, includes the casing that has accommodating space, its characterized in that still includes:

the pressing body is accommodated in the accommodating space and comprises a first assembly body and a second assembly body with a hollow structure, the first assembly body penetrates through the hollow structure and comprises an L-shaped clamping hook and a limiting protruding block which are correspondingly arranged, the second assembly body comprises a retaining wall, the retaining wall comprises a first sliding groove and an abutting notch, the abutting notch is arranged at one end of the first sliding groove, the L-shaped clamping hook slides along the first sliding groove, and therefore the abutting notch moves back and forth between the L-shaped clamping hook and the limiting protruding block;

variable capacitance accept in the accommodating space, including relative interval coupling first electrode and the second electrode that sets up, the second electrode is located the second stack body with between the first electrode, first electrode includes arc butt end, the barricade orientation of the second stack body the lateral wall of arc butt end is equipped with first inclined plane, second inclined plane and third inclined plane, first inclined plane with second inclined plane smooth phase meets and forms the arch, the second inclined plane with third inclined plane smooth phase meets and forms the cave in, the arc butt end with protruding with sunken elasticity butt.

2. The loud switch of claim 1 wherein the first electrode is machined from a resilient conductive material.

3. The loud switch of claim 1 wherein the second electrode comprises an insulating layer disposed between the first electrode and the second electrode.

4. The loud switch of claim 1 further comprising a capacitive circuit, the capacitive circuit comprising a fixed capacitance or a plurality of fixed capacitances, the fixed capacitance or the plurality of fixed capacitances being arranged in series with the variable capacitance formed by the coupling of the first electrode and the second electrode, the plurality of fixed capacitances connecting the output capacitance values in series or in parallel.

5. The ringing switch of claim 4 wherein said capacitive circuit comprises a plurality of branches, each of said branches being arranged in series with a variable capacitor formed by coupling said first electrode and said second electrode, each of said branches comprising at least one branch switch, said branch switch being closed or opened to cause said capacitive circuit to output a corresponding set capacitance value.

6. The loud switch of claim 1 wherein the first assembly further comprises a lead post, a second bottom wall and two opposing side walls, the two side walls are perpendicular to and on the same side as the second bottom wall, the lead post is a cylindrical structure extending from the center of the second bottom wall, the position-limiting protrusion is disposed at the junction of the side walls and the second bottom wall, the L-shaped hook is spaced from the lead post and is an L-shaped structure extending from the second bottom wall.

7. The loud switch of claim 6, wherein the casing comprises an upper cover and a base, the upper cover and the base enclose the accommodating space through a snap structure, the base comprises a first bottom wall, a lead pipe is arranged at the center of the first bottom wall, the lead pipe accommodates the lead column, and one end of the lead pipe, which is connected with the first bottom wall, is closed.

8. The loud switch of claim 7 further comprising an elastic body, wherein the elastic body is sleeved outside the lead pipe and sandwiched between the second bottom wall and the first bottom wall.

9. An input device, comprising:

the sound switch receives the physical pressing signal and correspondingly feeds back a capacitance change signal;

the capacitance detection module receives a capacitance change signal from the sound switch, judges the working state of the sound switch and generates a working state signal;

the control module receives an operating state signal from the capacitance detection module and correspondingly generates an input signal, wherein the audible switch is the audible switch as claimed in any one of claims 1 to 8.

10. The utility model provides a keyboard, includes circuit board, fixed plate, electric capacity detection module, the sound switch, the control module group that a plurality of arrays set up, sound switch array is located the circuit board, electric capacity detection module locates the circuit board, and with sound switch electricity is connected, the control module group basis electric capacity detection module's testing result corresponds produces input signal, its characterized in that: the loud switch is as claimed in any one of claims 1 to 8.

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