CN109003855B

CN109003855B - Micro-switch

Info

Publication number: CN109003855B
Application number: CN201810824921.8A
Authority: CN
Inventors: 付卫星
Original assignee: Comax Electronics Huizhou Co Ltd
Current assignee: Comax Electronics Huizhou Co Ltd
Priority date: 2018-07-25
Filing date: 2018-07-25
Publication date: 2020-08-28
Anticipated expiration: 2038-07-25
Also published as: CN109003855A

Abstract

The invention discloses a microswitch, which comprises a bottom shell, a contact terminal and a pressing piece, wherein the contact terminal comprises a conducting strip and a terminal, the conducting strip is arranged on the bottom shell, the terminal comprises a bottom sheet and a contact convex ring, and the contact convex ring is arranged on the bottom sheet; the pressing piece comprises a button and an elastic sheet, the elastic sheet abuts against the button, the conducting strip is used for abutting against the elastic sheet, and when the button is pressed, the conducting strip is used for extruding the elastic sheet to deform and enabling the deformation part of the elastic sheet to be in annular contact with the contact convex ring. The invention relates to a microswitch, which can ensure good contact between a spring plate and a terminal by arranging a contact convex ring on a bottom plate, and also can increase the contact pressure by the minimum contact surface, thereby keeping the continuity of the whole microswitch in the motion process, finally realizing the conduction function of the microswitch and ensuring that the microswitch can output stable waveforms.

Description

Micro-switch

Technical Field

The invention relates to the field of microswitches, in particular to a microswitch.

Background

The microswitch is a switch which has a minute contact interval and a quick action mechanism, performs a switching action by a specified stroke and a specified force, is covered by a shell, and has a driving rod outside. Also known as sensitive switches and snap switches. A pressure actuated fast switch. For door switches in anti-theft systems, etc. Microswitches, as the name implies, use switches of very small force. The switch is characterized in that external mechanical force acts on an action reed through a transmission element to enable a fixed contact and a movable contact at the tail end of the switch to be quickly connected or disconnected. The micro switch has a minute contact interval and a snap action mechanism, and the contact mechanism for performing a switching action with a predetermined stroke and force is covered by a housing, and has a small external shape with a driver. The microswitch consists of 5 major classes of components. The contact pitch is small and the moment is large. Typically, the drive shaft is external.

However, the quality demand of the micro switch in the market is higher and higher, the contact structure of the traditional micro switch is designed to be a convex point or a plane, the contact failure is easily generated by the design, the waveform generated after the micro switch is touched is unstable, and meanwhile, the contact hand feeling of the micro switch is poor.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides the microswitch with good contact, stable waveform and good contact hand feeling.

The purpose of the invention is realized by the following technical scheme:

a micro-switch, comprising:

a bottom shell, a bottom cover and a bottom cover,

the contact terminal comprises a conducting sheet and a terminal, the conducting sheet is arranged on the bottom shell, the terminal comprises a bottom sheet and a contact convex ring, and the contact convex ring is arranged on the bottom sheet; and

the pressing piece comprises a button and an elastic sheet, the elastic sheet abuts against the button, the conducting strip is used for abutting against the elastic sheet, and when the button is pressed, the conducting strip is used for extruding the elastic sheet to deform and enabling the deformation part of the elastic sheet to be in annular contact with the contact convex ring.

In one embodiment, a pressing convex ring is arranged on one side surface of the button facing the elastic sheet, and the projection of the pressing convex ring on the bottom sheet is coincident with the contact convex ring.

In one embodiment, the central axis of the contact convex ring and the central axis of the pressing convex ring are coincident with the central axis of the button.

In one embodiment, the conductive sheet is provided with a mounting opening, the inner side wall of the mounting opening is provided with a position avoiding opening communicated with the mounting opening, the bottom sheet comprises a mounting sheet and an external sheet, the mounting sheet is located in the mounting opening, the mounting sheet is arranged on the bottom case, one end of the external sheet is connected with the mounting sheet, the other end of the external sheet is exposed out of the position avoiding opening, and the middle position of the external sheet is accommodated in the position avoiding opening.

In one embodiment, the conductive sheet is bent towards the direction close to the elastic sheet to form a plurality of supporting convex parts, and each supporting convex part is used for supporting the elastic sheet together.

In one embodiment, the edge of the elastic sheet extends to form a plurality of supporting pieces, and each supporting piece is correspondingly arranged on each supporting convex part.

In one embodiment, the conductive sheet is bent towards a direction close to the elastic sheet to form four supporting protrusions, four supporting pieces are arranged at the edge of the elastic sheet in an extending manner, the four supporting pieces are correspondingly arranged on the four supporting protrusions one by one, the four supporting pieces are respectively located at four end corner positions of the elastic sheet, and the four supporting protrusions are respectively located at four end corner positions of the conductive sheet.

In one embodiment, the support sheet has a stepped structure.

In one embodiment, the elastic sheet is concave towards the direction close to the button to form a convex cambered surface structure.

In one embodiment, the bottom shell is provided with a mounting groove, and the bottom plate is arranged in the mounting groove.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the invention relates to a microswitch, which is used for extruding an elastic sheet to deform and enabling a deformation part of the elastic sheet to be in annular contact with a contact convex ring when a button is pressed. Therefore, good contact between the elastic sheet and the terminal can be ensured, the contact pressure is increased by the smallest contact surface, the continuity of the whole microswitch in the motion process is kept, the conduction function of the microswitch is finally realized, and the microswitch can output stable waveforms. Compared with the existing salient point or plane structure, the elastic sheet is in annular contact with the contact convex ring, is not like the contact of a salient point type and the contact of a plane type, so that the contact hand feeling of the micro switch is better, and the on-off operation of the switch is convenient.

Drawings

Fig. 1 is a schematic structural view of a microswitch according to an embodiment of the present invention;

FIG. 2 is an exploded view of the microswitch of FIG. 1;

FIG. 3 is a schematic view of a portion of the microswitch of FIG. 2;

fig. 4 is an exploded view of another embodiment of the microswitch shown in fig. 1.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, a micro switch 10 includes a bottom case 100, a contact terminal 200, and a pressing member 300. It should be noted that the bottom case 100 is used to protect the micro switch from being damaged; the contact terminal 200 is used for connecting an external circuit and providing a necessary contact part for pressing the microswitch; the pressing member 300 is used for pressing, so that the contact terminal can be conducted, and further, the conduction function of the micro switch can be realized.

Referring to fig. 2, the contact terminal 200 includes a conductive sheet 210 and a terminal 220, the conductive sheet 210 is disposed on the bottom case 100, and the terminal 220 is disposed on the bottom case 100. It should be noted that the conductive sheet 210 is used for connecting an external circuit; the terminal 220 is used for connecting another external circuit, when the pressing piece 300 is pressed down, the conducting strip 210 and the terminal 220 can be conducted with each other, and finally the conducting function of the microswitch is achieved, and when the pressing piece 300 is bounced, the conducting strip 210 and the terminal 220 are electrically disconnected, so that the microswitch is disconnected. In this way, by providing the conductive sheet 210 and the terminal 220, the conduction function of the micro switch can be realized.

Referring to fig. 3, the terminal 220 includes a bottom plate 221 and a contact convex ring 222, and the contact convex ring 222 is disposed on the bottom plate 221. Note that, the bottom plate 221 is used for mounting the contact convex ring 222 and for electrically connecting an external circuit; the contact protruding ring 222 protrudes from the bottom plate 221, and when the pressing member 300 is pressed down, the contact protruding ring 222 may first make annular contact with the outer surface of the contact protruding ring 222, so that the contact protruding ring 222 and the conductive sheet 210 may be electrically connected, and further, the terminal 220 and the conductive sheet 210 may be electrically connected, and finally, the conductive function of the micro switch may be achieved.

Referring to fig. 2 and 3, the pressing element 300 includes a button 310 and a resilient plate 320, the resilient plate 320 abuts against the button 310, and the conductive plate 210 abuts against the resilient plate 320. It should be noted that the button 310 is used for implementing the pressing process; the elastic sheet 320 is used for electrically connecting the conductive sheet 210 and the terminal 220 after being pressed, so that the conduction function of the micro switch can be realized. Further, when the button 310 is pressed, the elastic sheet 320 is pressed to deform, so that the deformed portion of the elastic sheet 320 is in annular contact with the contact convex ring 222.

Therefore, the elastic sheet 320 and the contact convex ring 222 are in annular contact, good contact performance can be achieved, stable waveforms can be provided, and contact handfeel of the microswitch can be better. Specifically, when the button 310 is not pressed, there is no contact between the dome 320 and the terminal 220, i.e., there is a gap between the dome 320 and the terminal 220; and the spring 320 and the conductive plate 210 are in contact with each other, i.e. the spring 320 and the conductive plate 210 are electrically connected to each other. When the button 310 is pressed, the button 310 moves downwards, the button 310 presses the elastic sheet 320, so that the elastic sheet 320 is elastically deformed, namely, the elastic sheet protrudes downwards along the pressed direction, in the deformation process of the elastic sheet 320, because the contact convex ring 222 on the terminal 220 protrudes from the bottom sheet 221, the elastic sheet 320 can be in annular contact with the contact convex ring 222 at the first time after being deformed, so that the good contact between the elastic sheet 320 and the terminal 220 can be ensured, the contact pressure is increased by the smallest contact surface, the continuity of the whole microswitch in the movement process is maintained, the microswitch can output stable waveforms, and the contact hand feeling of the microswitch is better.

It will be appreciated that the existing terminals are provided with bumps or flats. If be provided with the bump at the film, when the button was pressed, a side of shell fragment was extruded the back for elastic deformation takes place for the shell fragment, i.e. makes the shell fragment along by extruded direction undercut, thereby the shell fragment takes place the side after the deformation can take place the contact with the point with the bump, continues to press the back at the button, just can take place the shell fragment and contact with whole bump, because the reason of bump structure like this, the unstable condition appears in the wave form that can make micro-gap switch output. If the film is a plane, when the button is pressed, one side surface of the elastic sheet is pressed, the elastic sheet is elastically deformed, namely, the elastic sheet is downwards sunken along the pressed direction, at the beginning, the deformed side surface of the elastic sheet can be contacted with the film, after further pressing, the sunken part of the elastic sheet can be completely contacted with the film, namely, the contact between the film and the film or the surface and the surface is contacted, although the stable waveform output of the structure of the film can be ensured, the structure of the film is a plane structure, so that the good contact can be ensured after pressing, and the problem of poor contact of the microswitch is easily caused. Therefore, in order to improve the contact of the micro switch and ensure the waveform stability of the micro switch, in one embodiment, for example, the terminal 220 includes a bottom plate 221 and a contact protrusion 222, and when the button 310 is pressed, the terminal is used for pressing the elastic sheet 320 to deform and make the deformed portion of the elastic sheet 320 and the contact protrusion 222 to make annular contact. Therefore, the elastic sheet 320 and the contact convex ring 222 are in annular contact, good contact performance can be achieved, stable waveforms can be provided, and contact handfeel of the microswitch can be better. Specifically, when the button 310 is pressed, the button 310 moves downward, the button 310 presses the elastic sheet 320, so that the elastic sheet 320 is elastically deformed, that is, the elastic sheet 320 is recessed downward along the pressed direction, in the process of deformation of the elastic sheet 320, because the contact convex ring 222 on the terminal 220 is protruded from the bottom sheet 221, the elastic sheet 320 is in contact with the outer surface of the contact convex ring 222 at the first time after deformation, that is, the outer surface of the recessed portion of the elastic sheet 320 is in surface-to-surface contact with the outer surface of the contact convex ring 222, and because the contact convex ring 222 is of an annular structure, the outer surface of the recessed portion of the elastic sheet 320 is in annular contact with the outer surface of the contact convex ring 222, or the recessed portion of the elastic sheet can be in surface-to-surface contact with the contact convex ring directly, that is, the outer surface of the recessed portion of the elastic sheet is in annular contact with the outer surface of the contact convex ring, so that good, and the contact pressure is increased by the minimum contact surface, the continuity of the whole microswitch in the motion process is kept, the conduction function of the microswitch is finally realized, and the microswitch can output stable waveforms. Compared with the existing salient point or plane structure, the elastic sheet is in annular contact with the contact convex ring, is not like the contact of a salient point type and the contact of a plane type, so that the contact hand feeling of the micro switch is better, and the on-off operation of the switch is convenient.

When the button is released, the button is not acted by external force, so that the elastic sheet cannot be extruded, and the elastic sheet can be restored to the original state because the elastic sheet does not receive the extrusion force, so that the elastic sheet is not contacted with the contact convex ring, and the disconnection operation of the microswitch is realized. It can be understood that when the button receives external pressure, promote the shell fragment downstream for conducting strip and terminal simultaneously with the shell fragment contact, realize the switch function of breaking out, when external pressure release, under the drive of the internal tension of shell fragment, make it resume deformation, the contact of shell fragment and terminal breaks away from, and then makes the contact of conducting strip and terminal break away from, realizes the switch function of breaking out.

In order to further improve the good contact between the elastic sheet and the contact convex ring, the stability of the waveform of the microswitch is ensured. In one embodiment, for example, referring to fig. 4, a pressing convex ring 330 is disposed on a side surface of the button 310 facing the elastic sheet 320, and a projection of the pressing convex ring 330 on the bottom sheet 221 coincides with the contact convex ring 222. Specifically, the pressing protrusion 330 is used to allow sufficient contact between the striking flake 320 and the contact protrusion 222 when the button is pressed. When the button is pressed, the pressing convex ring 330 can be tightly attached to the elastic sheet after the button is pressed down, so that the downward sunken part of the elastic sheet is just matched with the size and the shape of the contact convex ring, the good contact performance of the elastic sheet and the contact convex ring can be further improved when the button is pressed down, and the stability of the waveform of the microswitch is ensured.

It should be noted that, in order to ensure that the elastic sheet and the contact convex ring have good contact when the button is pressed, the stability during contact is further improved, and the stability of the micro switch waveform is improved; in one embodiment, for example, the central axis of the contact collar 222 and the central axis of the pressing collar 330 coincide with the central axis of the button 310. So, through with contact bulge loop 222, press bulge loop 330 and button 310 setting on same center axis, can be so that when pressing the button, guarantee to press the direction that bulge loop 330 pushed down and can push down along the central axis, make and press the bulge loop 330 back of pushing down, the deformation shape on the shell fragment, the size of deformation and the scope of deformation can be identical with the contact bulge loop just, make shell fragment and contact bulge loop 222 take place the annular contact better, the contact between shell fragment and the contact bulge loop 222 is better, the contact is inseparable, shell fragment and contact bulge loop have good contact when guaranteeing that the button presses, stability when further improving the contact, improve the stability of micro-gap switch wave form.

Referring to fig. 3, a mounting opening 211 is formed in the conductive sheet 210, an avoiding opening 212 communicated with the mounting opening 211 is formed in an inner side wall of the mounting opening 211, the bottom sheet 211 includes a mounting sheet 221a and an external sheet 221b, the mounting sheet 221a is located in the mounting opening 221, the mounting sheet 221a is disposed on the bottom case 100, one end of the external sheet 221b is connected with the mounting sheet 221a, the other end of the external sheet 221b is exposed out of the avoiding opening 212, and a middle position of the external sheet 221b is accommodated in the avoiding opening 212. It should be noted that the mounting opening 211 is used for accommodating a negative plate, and a gap is formed between the negative plate and the conductive sheet; the position avoiding opening 212 is used for accommodating an external connecting sheet, so that the external connecting sheet can be connected with an external circuit and a mounting sheet, and the mounting sheet, the contact convex ring and the external circuit are electrically connected; the mounting piece 221a is used for mounting the contact convex ring; the external connection piece 221b is used for external circuit, i.e. for connecting the external circuit and the mounting piece, and realizes the electrical connection between the mounting piece and the contact convex ring and the external circuit. Thus, by arranging the mounting opening 211 and the avoiding opening 212, an interval can be formed between the conducting plate and the negative plate, and the microswitch can be ensured to realize stable on-off operation; and through setting up installation piece 221a and external connection piece 221b, can install the contact bulge loop to make film and contact bulge loop can connect on the circuit outward, further guarantee that micro-gap switch can realize stably switching on or off the operation.

Referring to fig. 3, the conductive sheet 210 is bent toward the elastic sheet 222 to form a plurality of supporting protrusions 213, and each supporting protrusion 213 is used for supporting the elastic sheet 320 together. The supporting protrusion 213 is used to support the elastic sheet. Specifically, the edge of the elastic sheet 320 extends to form a plurality of supporting pieces 321, and each supporting piece 321 is correspondingly disposed on each supporting protrusion 213. The support piece 321 is used to support the spring plate, that is, the support piece is placed on the supporting protrusion 213, so that a certain gap is formed between the spring plate and the terminal, that is, when the support piece is placed on the supporting protrusion, the spring plate can be lifted up, so that a certain gap is formed between the spring plate and the contact protrusion ring, and the gap is sufficient to disconnect the electrical connection of the micro switch.

In this embodiment, the conductive sheet 210 is bent toward the direction close to the elastic sheet 222 to form four supporting protrusions 213, the edge of the elastic sheet extends to form four supporting pieces 321, the four supporting pieces 321 are correspondingly disposed on the four supporting protrusions 213 one by one, the four supporting pieces 321 are respectively located at four end corners of the elastic sheet 222, and the four supporting protrusions 213 are respectively located at four end corners of the conductive sheet 210. Thus, by arranging the four supporting pieces 321 and the four supporting protrusions 213 in a one-to-one correspondence, the supporting pieces can be stably placed on the supporting protrusions, and then the elastic pieces can be stably placed on the supporting protrusions of the conducting pieces, so that the stability and reliability of the micro switch can be improved.

In one embodiment, the supporting plate 321 has a stepped structure. Thus, by arranging the supporting sheet 321 with the stepped structure, a gap can be formed between the elastic sheet and the contact convex ring, and the supporting sheet 321 can be placed on the top supporting convex part 213 to support the elastic sheet, so that the elastic sheet can be more firmly placed above the contact convex ring, and the effectiveness of the micro switch in disconnection can be ensured.

In another embodiment, the resilient tab 320 is recessed in a direction close to the button 310 to form a convex arc structure. So, through the shell fragment that sets up convex arc surface structure, can make the contact segment of the pushing down of shell fragment protruding in the contact bulge loop, namely make to have the clearance between the contact segment of spring and the contact bulge loop to can further guarantee the validity of micro-gap switch disconnection, can also guarantee to realize micro-gap switch's waveform stability better.

In another embodiment, in order to more firmly install the elastic sheet on the abutting convex part, the size of the gap between the elastic sheet and the contact convex ring can be further increased, so that the effectiveness and the stability of annular contact between the elastic sheet and the contact convex ring when the button is pressed are improved, and the stable contact of the microswitch is further realized; for example, the conductive sheet 210 is bent toward the direction close to the elastic sheet 222 to form four supporting protrusions 213, the edge of the elastic sheet extends to form four supporting pieces 321, the four supporting pieces 321 are correspondingly disposed on the four supporting protrusions 213 one by one, the four supporting pieces 321 are respectively located at four end corners of the elastic sheet 222, and the four supporting protrusions 213 are respectively located at four end corners of the conductive sheet 210. Further, the support plate 321 has a stepped structure. Further, the resilient tab 320 is recessed toward the button 310 to form a convex arc structure. Thus, by arranging the supporting sheet with the stepped structure, the elastic sheet with the convex cambered surface structure and the jacking convex part, the elastic sheet can be more firmly arranged on the jacking convex part 213, the size of a gap between the elastic sheet and the contact convex ring can be further increased, the effectiveness and the stability of annular contact between the elastic sheet and the contact convex ring when the button is pressed are further improved, the stable contact of the microswitch is further realized, and the stability of the waveform of the microswitch can be also improved; through the support sheet with the stepped structure and the elastic sheet with the convex cambered surface structure, the gap between the elastic sheet and the contact convex ring can be increased, and the contact hand feeling is better when the elastic sheet is pressed.

Please refer to fig. 2, an installation groove 110 is formed on the bottom case 100, and the bottom plate 221 is disposed in the installation groove 110. Therefore, the film can be fixed in the mounting groove by arranging the mounting groove 110, so that the stability and the reliability of the film can be improved, and the film can be externally connected with a circuit or a microswitch is conducted.

It should be further noted that, in order to ensure good contact between the elastic sheet and the contact convex ring when the button is pressed, and in order to improve the pressing effect of the convex cambered surface structure of the elastic sheet, the stability during contact is further improved, and the stability of the micro switch waveform is improved; in one embodiment, for example, the central axis of the contact collar 222, the central axis of the pressing collar 330, and the central axis of the button 310 coincide with the central axis of the convex arc structure of the dome spring. The annular contact occurs better. Thus, by arranging the central axes of the convex arc structure of the contact convex ring 222, the pressing convex ring 330, the button 310 and the spring plate on the same central axis, it is possible to ensure that the pressing direction of the pressing lug 330 can be pressed down along the central axis when the button is pressed, so that after the pressing lug 330 is pressed down, the convex cambered surface structure of the elastic sheet is deformed, and the deformed shape, the deformed size and the deformed range can be just matched with the contact convex ring, that is, the convex arc structure of the spring plate is better in annular contact with the contact convex ring 222, the contact between the convex arc structure of the spring plate and the contact convex ring 222 is better and tight, thereby shell fragment and contact bulge loop have good contact when guaranteeing that the button is pressed, improve the convex cambered surface structure of shell fragment and press the effect, stability when further improving the contact improves the stability of micro-gap switch wave form.

Referring to fig. 1 and 2, the micro switch 10 further includes an upper cover 400, and the upper cover is fastened to the bottom case. Therefore, the protection of the microswitch can be further improved, and the service life of the microswitch is prolonged.

the invention relates to a microswitch, which is characterized in that a contact convex ring is arranged on a bottom sheet, and when a button is pressed, the contact convex ring is used for extruding a spring plate to deform and enabling a deformation part of the spring plate to be in annular contact with the contact convex ring. Therefore, good contact between the elastic sheet and the terminal can be ensured, the contact pressure is increased by the smallest contact surface, the continuity of the whole microswitch in the motion process is kept, the conduction function of the microswitch is finally realized, and the microswitch can output stable waveforms. Compared with the existing salient point or plane structure, the elastic sheet is in annular contact with the contact convex ring, is not like the contact of a salient point type and the contact of a plane type, so that the contact hand feeling of the micro switch is better, and the on-off operation of the switch is convenient.

The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A micro-switch, comprising:

a bottom shell, a bottom cover and a bottom cover,

the pressing piece comprises a button and an elastic sheet, the elastic sheet abuts against the button, the conductive sheet is used for abutting against the elastic sheet, and when the button is pressed, the conductive sheet is used for extruding the elastic sheet to deform and enabling the deformation part of the elastic sheet to be in annular contact with the contact convex ring;

the conducting sheet is internally provided with a mounting opening, the inner side wall of the mounting opening is provided with a position avoiding opening communicated with the mounting opening, the bottom sheet comprises a mounting sheet and an external sheet, the mounting sheet is positioned in the mounting opening and arranged on the bottom shell, one end of the external sheet is connected with the mounting sheet, the other end of the external sheet is exposed out of the position avoiding opening, and the middle position of the external sheet is accommodated in the position avoiding opening;

one side surface of the button facing the elastic sheet is provided with a pressing convex ring, and the projection of the pressing convex ring on the bottom sheet is superposed with the contact convex ring.

2. The microswitch of claim 1, wherein a central axis of the contact collar and a central axis of the press collar coincide with a central axis of the button.

3. The microswitch of claim 1, wherein the conductive sheet is bent in a direction close to the spring plate to form a plurality of supporting protrusions, and each supporting protrusion is used for supporting the spring plate together.

4. The microswitch of claim 3, wherein a plurality of support pieces extend from the edge of the elastic sheet, and each support piece is correspondingly arranged on each supporting convex part.

5. The microswitch of claim 4, wherein the conductive sheet is bent towards a direction close to the elastic sheet to form four supporting protrusions, the edge of the elastic sheet extends to form four supporting pieces, the four supporting pieces are correspondingly arranged on the four supporting protrusions one by one, the four supporting pieces are respectively located at four end corners of the elastic sheet, and the four supporting protrusions are respectively located at four end corners of the conductive sheet.

6. The microswitch of claim 4, wherein the support tab has a stepped configuration.

7. The microswitch of claim 1, wherein the spring tab is recessed in a direction adjacent the button to form a convex arcuate surface.

8. The microswitch of claim 1, wherein a mounting slot is defined in the bottom housing, and the base plate is disposed in the mounting slot.