Push switch

Abstract

This push switch comprises: a housing that has a first accommodation portion; a central fixed contact provided to a bottom section of the first accommodation portion; a movable contact member that is disposed inside the first accommodation portion, and performs an inversion operation by receiving a pushing force from above, thereby bringing a central section thereof into contact with the central fixed contact; and a cover member that covers an upper section of the first accommodation portion, wherein the movable contact member is formed by superimposing a plurality of metal sheets on each other, a lowermost layer metal sheet among the plurality of metal sheets has a rotation stop part provided so as to protrude outward from an outer peripheral edge portion, the housing has a second accommodation portion that accommodates the rotation stop part, the rotation stop part abuts an inner wall surface of the second accommodation portion to thereby stop the rotation of the bottom layer metal sheet, and an uppermost layer metal sheet among the plurality of metal sheets does not have a rotation stop part, but rather includes a pressing member that presses a surface of the uppermost layer metal sheet from above to thereby suppress rotation of the uppermost layer metal sheet.

Description

Technical Field

[0001] The present invention relates to a push switch.

Background Art

[0002] In Patent Document 1 below, in a push switch including a plurality of metal contacts (movable contact members) overlapped with each other, by providing a pair of rotation stoppers protruding from the outer peripheral edge portion to all of the plurality of metal contacts, a technique capable of suppressing the rotation of all of the plurality of metal contacts is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technique of Patent Document 1, when a pressing operation is performed by a pressing member and the plurality of metal contacts perform a reverse operation, the rotation stopper of the uppermost metal contact closest to the cover sheet provided so as to cover the plurality of metal contacts may jump up, which may damage the cover sheet.

Means for Solving the Problems

[0005] A push switch according to one embodiment comprises a housing having a first housing section, a central fixed contact provided at the bottom of the first housing section, a movable contact member disposed within the first housing section which reverses direction upon receiving an upward pressing force so that its central portion contacts the central fixed contact, and a cover member covering the upper part of the first housing section. The movable contact member is composed of multiple metal plates stacked on top of each other, and the lowest metal plate, which is positioned at the bottom of the multiple metal plates, has a rotation-preventing portion that protrudes outward from its outer peripheral edge. The housing has a second housing section that accommodates the rotation-preventing portion, and the rotation of the lowest metal plate is suppressed when the rotation-preventing portion abuts against the inner wall surface of the second housing section. The uppermost metal plate, which is positioned at the top of the multiple metal plates, does not have a rotation-preventing portion, and is provided between the cover member and the uppermost metal plate, with a retaining member that suppresses the rotation of the uppermost metal plate by pressing down on its surface from above. [Effects of the Invention]

[0006] According to one embodiment, wear of the movable contact member and damage to the cover member can be suppressed. [Brief explanation of the drawing]

[0007] [Figure 1] External perspective view of a push switch according to one embodiment. [Figure 2] Exploded perspective view of a push switch according to one embodiment. [Figure 3] Plan view of a push switch according to one embodiment [Figure 4] Cross-sectional view of a push switch according to one embodiment. [Figure 5] Perspective cross-sectional view of a push switch according to another embodiment. [Modes for carrying out the invention]

[0008] An embodiment will be described below with reference to the drawings. For convenience, in the following description, the Z-axis direction in the drawings will be considered as the vertical direction, the Y-axis direction as the left-right direction, and the X-axis direction as the front-back direction. However, the positive Z-axis direction will be considered upward, the positive Y-axis direction as the rightward direction, and the positive X-axis direction as the forward direction.

[0009] (Overview of push switch 100) Figure 1 is an external perspective view of a push switch 100 according to one embodiment. As shown in Figure 1, the push switch 100 has a generally thin rectangular parallelepiped shape in the vertical direction (Z-axis direction), and in a plan view from above, it has a rectangular shape with the left-right direction (Y-axis direction) as its longitudinal direction. As shown in Figure 1, the upper surface 160A of the housing 160 of the push switch 100 is covered by an insulator 110. A raised portion 111 is formed in the center of the insulator 110, which is convex upward (positive Z-axis direction). A pressing body 120 is bonded to the back side of the raised portion 111. As a result, the push switch 100 can be pressed downward (negative Z-axis direction) by the pressing body 120, and this pressing operation can switch it from the switch-off state to the switch-on state.

[0010] (Configuration of push switch 100) Figure 2 is an exploded perspective view of a push switch 100 according to one embodiment. As shown in Figure 2, the push switch 100 comprises, in order from the bottom (negative Z-axis side) in the figure, a housing 160, a movable contact member 150, and an insulator 110.

[0011] The housing 160 is a container-like member having a thin rectangular parallelepiped shape in the vertical direction (Z-axis direction). In a plan view from above, the housing 160 has a rectangular shape with the left-right direction (Y-axis direction) as the longitudinal direction and the front-back direction (X-axis direction) as the short direction. The housing 160 has a first housing portion 160B that is recessed downward from the upper surface 160A. The movable contact member 150 is housed in the first housing portion 160B. For example, the housing 160 is formed by insert molding using a relatively hard insulating material (e.g., hard resin).

[0012] The bottom 160C of the first housing portion 160B of the housing 160 is provided with a central fixed contact 161 and four peripheral fixed contacts 162. The central fixed contact 161 is located in the center of the bottom 160C. The four peripheral fixed contacts 162 are located in the peripheral areas of the bottom 160C. Both the central fixed contact 161 and the peripheral fixed contacts 162 are formed using a conductive material (for example, a metal material).

[0013] The movable contact member 150 is positioned within the first housing portion 160B of the housing 160. The movable contact member 150 has a dome shape that is convex upward (in the positive Z-axis direction) and has a top portion 150A in the center. When the movable contact member 150 receives a pressing force from above, it reverses direction so that its central portion contacts the central fixed contact 161 provided at the bottom portion 160C of the first housing portion 160B of the housing 160. The movable contact member 150 is placed on the four peripheral fixed contacts 162 such that its circular outer edge contacts each of the four peripheral fixed contacts 162 provided at the bottom portion 160C of the first housing portion 160B of the housing 160.

[0014] The movable contact member 150 is a so-called "reversal spring." When pressed by the pressing body 120, the top portion 150A is pressed downward by the pressing body 120. When the predetermined operating load is exceeded, the top portion 150A rapidly deforms elastically into a concave shape (reversal movement). As a result, the movable contact member 150 contacts the central fixed contact 161 on the back side of the top portion 150A, and is electrically connected to the central fixed contact 161. Consequently, the movable contact member 150 can electrically connect the central fixed contact 161 and the peripheral fixed contact 162 to each other via the movable contact member 150. When the movable contact member 150 is released from the pressing force from the pressing body 120, it returns to its original convex shape by elastic force.

[0015] The movable contact member 150 is constructed by stacking a bottom metal plate 151, which is positioned at the bottom, and an uppermost metal plate 152, which is positioned at the top. Both the bottom metal plate 151 and the uppermost metal plate 152 have a circular shape when viewed from above and are dome-shaped members that are convex upwards (in the positive Z-axis direction). Both the bottom metal plate 151 and the uppermost metal plate 152 are formed into a dome shape using thin metal plates.

[0016] In this embodiment, the movable contact member 150 is described as being made up of multiple overlapping metal plates. However, as an alternative method of description, it can also be described as being made up of multiple overlapping movable contact members 150 by considering each metal plate as a single movable contact member 150.

[0017] The insulator 110 is a thin, sheet-like member placed on the upper surface 160A of the housing 160. The insulator 110 is an example of a "cover member that covers the upper part of the first housing section". The insulator 110 is formed using a resin material such as PET. In a plan view from above, the insulator 110 has a rectangular shape, with the left-right direction (Y-axis direction) as the longitudinal direction and the front-back direction (X-axis direction) as the short direction. That is, in a plan view from above, the insulator 110 has substantially the same shape as the upper surface 160A of the housing 160 so that it can cover substantially the entire upper surface 160A of the housing 160. The insulator 110 is bonded to the upper surface 160A of the housing 160 by any adhesive means (for example, laser welding) while covering the upper surface 160A of the housing 160. The insulator 110 seals the first housing portion 160B of the housing 160 by closing the upper opening of the first housing portion 160B. A raised portion 111 is formed in the center of the insulator 110, which is convex upward (in the positive Z-axis direction). As shown in Figure 3, the pressing body 120 is adhered to the back side of the raised portion 111.

[0018] The pressing body 120 is a member disposed on the top 150A of the movable contact member 150 and within the space on the back side of the raised portion 111 of the insulator 110. The pressing body 120 has a circular shape in a plan view from above (see FIG. 3), and has a three-dimensional shape that protrudes upward from the top 130A of the movable contact member 150. The pressing body 120 is formed using a resin material such as PA. The pressing body 120 has a curved upper surface portion along the raised portion 111 of the insulator 110, and on this upper surface portion, it is adhered to the back side portion of the raised portion 111 of the insulator 110 by any adhesion means (for example, laser welding, etc.). In the present embodiment, the pressing body 120 has a three-dimensional shape such that a hemispherical shape is crushed in the vertical direction (Z-axis direction) (see FIG. 4). However, it is not limited to this, and the pressing body 120 may be a cylindrical shape, an ellipsoid, etc. Further, the pressing body 120 is not limited to having a circular shape in a plan view from above.

[0019] (Operation of Push Switch 100) In the push switch 100 according to one embodiment, when the pressing operation by the pressing body 120 is not performed, since the movable contact member 150 is in an initial state convex upward, the movable contact member 150 is in contact with the peripheral fixed contact 162 but not in contact with the central fixed contact 161. That is, the peripheral fixed contact 162 and the central fixed contact 161 are not electrically connected to each other. Therefore, the push switch 100 according to one embodiment is in an off state when the pressing operation by the pressing body 120 is not performed.

[0020] In one embodiment, when a pressing operation is performed by the pressing body 120, the pressing body 120 presses down the top portion 150A of the movable contact member 150. When the operating load of the pressing operation by the pressing body 120 exceeds a predetermined threshold value, the top portion 150A of the movable contact member 150 elastically deforms (inverts) in a concave shape. As a result, the movable contact member 150 is electrically connected to the central fixed contact 161 by the portion on the back side of the top portion 150A coming into contact with the central fixed contact 161. As a result, the push switch 100 is turned on by the central fixed contact 161 and the peripheral fixed contact 162 being electrically connected to each other through the movable contact member 150. At this time, the push switch 100 according to one embodiment can exhibit a click feeling with respect to the pressing operation by the pressing body 120 due to the inversion operation of the movable contact member 150. Therefore, the push switch 100 according to one embodiment can allow the operator to tactilely recognize that the switch has been switched to the on state.

[0021] Note that when the pressing operation by the pressing body 120 is released, the movable contact member 150 returns to its original convex shape by its own elastic force. As a result, the push switch 100 returns to the off state.

[0022] (Rotation prevention structure) Hereinafter, referring to FIGS. 3 and 4, the rotation prevention structure included in the push switch 100 according to one embodiment will be described. FIG. 3 is a plan view of the push switch 100 according to one embodiment. FIG. 4 is a cross-sectional view of the push switch 100 according to one embodiment. In FIG. 4, the illustration of the insulator 110 is omitted so that the pressing body 120 can be visually recognized from above.

[0023] The bottom metal plate 151 has a rotation-retaining portion 151A that protrudes radially outward from its circular outer edge. In this embodiment, as an example, the bottom metal plate 151 has two rotation-retaining portions 151A arranged at 180° intervals (i.e., arranged point-symmetrically). Of the two rotation-retaining portions 151A, one protrudes in the positive Y-axis direction, and the other protrudes in the negative Y-axis direction. Both rotation-retaining portions 151A are tongue-shaped and extend horizontally (i.e., parallel to the XY plane) from the outer edge of the bottom metal plate 151.

[0024] The housing 160 has a second housing section 163 that is recessed outward from the inner wall surface of the first housing section 160B (outward in the radial direction of the circle formed by the bottom metal plate 151). The second housing section 163 accommodates the rotation-stopping portion 151A of the bottom metal plate 151. In this embodiment, as the bottom metal plate 151 has two rotation-stopping portions 151A, the housing 160 has two second housing sections 163. That is, the housing 160 has a second housing section 163 on the inner wall surface on the positive Y-axis side of the first housing section 160B and on the inner wall surface on the negative Y-axis side of the first housing section 160B.

[0025] As shown in Figures 3 and 4, each of the two rotation-stopping portions 151A on the bottom metal plate 151 is housed in each of the two second housing portions 163 on the housing 160. As a result, in one embodiment of the push switch 100, even if the bottom metal plate 151 rotates when pressed by the pressing body 120, each of the two rotation-stopping portions 151A on the bottom metal plate 151 abuts against the inner wall surface of each of the two second housing portions 163 on the housing 160, thereby preventing the rotation of the bottom metal plate 151. Therefore, according to one embodiment of the push switch 100, wear of the top metal plate 152 and the bottom metal plate 151 due to friction between them can be suppressed.

[0026] However, if a similar rotation-stopping mechanism were also provided on the uppermost metal plate 152, there is a risk that when the movable contact member 150 reverses direction, the rotation-stopping mechanism on the uppermost metal plate 152 closest to the insulator 110 may spring up, potentially damaging the insulator 110.

[0027] Therefore, in the push switch 100 according to one embodiment, the uppermost metal plate 152 does not have a rotation stopper. As a result, the push switch 100 according to one embodiment can prevent damage to the insulator 110 when the movable contact member 150 reverses direction.

[0028] In one embodiment of the push switch 100, the uppermost metal plate 152 does not have a rotation-stopping part, but since the uppermost metal plate 152 can be pressed from above by the pressing body 120, the rotation of the uppermost metal plate 152 can be suppressed. Therefore, according to the push switch 100 of one embodiment, wear of the uppermost metal plate 152 and the lowermost metal plate 151 due to friction between the uppermost metal plate 152 and the lowermost metal plate 151 can be suppressed.

[0029] In one embodiment of the push switch 100, even if the rotation-stopping portion 151A of the lowest metal plate 151 springs up when the movable contact member 150 reverses direction, a sufficient distance is provided between the rotation-stopping portion 151A and the insulator 110 so that the rotation-stopping portion 151A does not come into contact with the insulator 110. As a result, the push switch 100 according to one embodiment can prevent damage to the insulator 110 when the movable contact member 150 reverses direction.

[0030] [Another embodiment] Figure 5 is a perspective cross-sectional view of a push switch 100-2 according to another embodiment. The push switch 100-2 shown in Figure 5, according to another embodiment, is a modified example of the push switch 100 according to one embodiment. As shown in Figure 5, the push switch 100-2 is similar to the push switch 100 according to one embodiment in that it comprises a housing 160, an insulator 110, and a pressing body 120. However, the push switch 100-2 differs from the push switch 100 in that it comprises a movable contact member 150, an insulating sheet 140, and a second movable contact member 130 in order from the bottom inside the first housing portion 160B of the housing 160.

[0031] The second movable contact member 130 is positioned above the movable contact member 150 within the first housing portion 160B of the housing 160. The second movable contact member 130 has a dome shape that is convex upward (in the positive Z-axis direction) and has a apex 130A in the center. The second movable contact member 130 is formed into a dome shape using a thin metal plate. The second movable contact member 130 is in contact with a second peripheral fixed contact (not shown) provided within the first housing portion 160B of the housing 160, and is electrically connected to the second peripheral fixed contact. The second movable contact member 130 is a so-called "reversal spring," and when a pressing operation is performed by the pressing body 120, the apex 130A is pressed downward by the pressing body 120, and when a predetermined operating load is exceeded, the apex 130A rapidly elastically deforms into a concave shape (reversal operation). As a result, the second movable contact member 130 contacts the top 150A of the movable contact member 150 at the back side of the top 130A, and is electrically connected to the peripheral fixed contact 162 via the movable contact member 150. When the second movable contact member 130 is released from the pressing force from the pressing body 120, it returns to its original convex shape due to elastic force.

[0032] The insulating sheet 140 is formed using an insulating material. It is a sheet-like component. The insulating sheet 140 is placed between the second movable contact member 130 and the movable contact member 150 within the first housing portion 160B of the housing 160. As a result, the insulating sheet 140 insulates the second movable contact member 130 and the movable contact member 150 from making electrical contact with each other when the push switch 100 is not being pressed. A circular opening 141 is formed in the center of the insulating sheet 140. When the pressing operation is performed by the pressing body 120, the insulating sheet 140 is configured so that the back side of the top portion 130A of the second movable contact member 130 can be brought into contact with the top portion 150A of the movable contact member 150 through the opening 141.

[0033] (Operation of push switch 100-2) In another embodiment of the push switch 100-2, when a half-press operation is performed by the pressing body 120, the pressing body 120 presses down the top portion 130A of the second movable contact member 130, causing the top portion 130A of the second movable contact member 130 to elastically deform into a concave shape (reverse operation). As a result, the back side of the top portion 130A of the second movable contact member 130 comes into contact with the top portion 150A of the movable contact member 150, thereby electrically connecting with the peripheral fixed contact 162 via the movable contact member 150. Consequently, the push switch 100-2 enters the first switch-on state as the second peripheral fixed contact and the peripheral fixed contact 162 become electrically connected to each other via the movable contact member 150 and the second movable contact member 130. In this case, the push switch 100-2 in the other embodiment can provide a click sensation in response to a half-press operation by the pressing body 120 due to the reversal operation of the second movable contact member 130. Therefore, the push switch 100-2 according to another embodiment allows the operator to tactilely understand that it has switched to the first switch-on state.

[0034] In another embodiment of the push switch 100-2, when the pressing body 120 is fully pressed, the pressing body 120 further presses down the top portion 130A of the second movable contact member 130. As a result, the second movable contact member 130 presses down the top portion 150A of the movable contact member 150 with the back side portion of the top portion 130A, causing the top portion 150A of the movable contact member 150 to elastically deform (reverse movement) into a concave shape. As a result, the back side portion of the top portion 150A of the movable contact member 150 comes into contact with the central fixed contact 161, thereby electrically connecting it to the central fixed contact 161. Consequently, the push switch 100-2 enters a second switch-on state as the central fixed contact 161 and the peripheral fixed contact 162 become electrically conductive with each other via the movable contact member 150. In this case, the push switch 100-2 according to one embodiment can provide a click sensation in response to a full press operation by the pressing body 120 by the reversing operation of the movable contact member 150. Therefore, the push switch 100-2 according to another embodiment can allow the operator to tactilely understand that it has switched to the second switch-on state.

[0035] In addition, in another embodiment of the push switch 100-2, when the half-press and full-press operations by the pressing body 120 are released, the movable contact member 150 returns to its original convex shape by its own elastic force, and the second movable contact member 130 also returns to its original convex shape by its own elastic force. As a result, the push switch 100-2 returns to the switch-off state.

[0036] (Rotation prevention structure) In another embodiment of the push switch 100-2, the movable contact member 150 is composed of a bottom layer metal plate 151 positioned at the bottom, an uppermost layer metal plate 152 positioned at the top, and an intermediate layer metal plate 153 positioned between the bottom layer metal plate 151 and the uppermost layer metal plate 152. That is, in another embodiment of the push switch 100-2, the movable contact member 150 is composed of three metal plates stacked on top of each other. The bottom layer metal plate 151, the uppermost layer metal plate 152, and the intermediate layer metal plate 153 all have a circular shape when viewed from above and are dome-shaped members that are convex upward (in the positive Z-axis direction). The bottom layer metal plate 151, the uppermost layer metal plate 152, and the intermediate layer metal plate 153 are all formed into a dome shape using thin metal plates.

[0037] In another embodiment of the push switch 100-2, the bottom metal plate 151 has a rotation-stopping portion 151A that protrudes radially outward from its circular outer edge. Similarly, the intermediate metal plate 153 has a rotation-stopping portion 153A that protrudes radially outward from its circular outer edge.

[0038] As shown in Figure 5, each of the two rotation-stopping portions 151A on the bottom metal plate 151 and the two rotation-stopping portions 153A on the intermediate metal plate 153 are housed in each of the two second housing portions 163 of the housing 160. As a result, in the push switch 100-2 according to another embodiment, even if the bottom metal plate 151 and the intermediate metal plate 153 rotate when the pressing operation is performed by the pressing body 120, each of the two rotation-stopping portions 151A on the bottom metal plate 151 and the two rotation-stopping portions 153A on the intermediate metal plate 153 abut against the inner wall surface of each of the two second housing portions 163 of the housing 160, thereby preventing the rotation of the bottom metal plate 151 and the intermediate metal plate 153. Therefore, according to the push switch 100-2 of another embodiment, wear of the uppermost metal plate 152, the intermediate metal plate 153, and the lowermost metal plate 151 due to friction between the intermediate metal plate 153 and the bottommost metal plate 151, and friction between the uppermost metal plate 152 and the intermediate metal plate 153 can be suppressed.

[0039] Furthermore, in another embodiment of the push switch 100-2, the uppermost metal plate 152 does not have a rotation stopper. This prevents damage to the insulating sheet 140 (another example of the "cover member") when the movable contact member 150 reverses direction.

[0040] In addition, in the push switch 100-2 according to another embodiment, the uppermost metal plate 152 does not have a rotation stopper, but the uppermost metal plate 152 can be pressed from above by the insulating sheet 140 (another example of a "pressing member"), thereby preventing the rotation of the uppermost metal plate 152. Therefore, according to the push switch 100-2 according to another embodiment, wear of the uppermost metal plate 152 and the intermediate metal plate 153 due to friction between the uppermost metal plate 152 and the intermediate metal plate 153 can be suppressed.

[0041] As described above, when the movable contact member 150 has an intermediate layer metal plate 153, it is preferable to provide a rotation stopper portion 153A on the intermediate layer metal plate 153 as well. Furthermore, when the movable contact member 150 has multiple intermediate layer metal plates 153, it is preferable to provide a rotation stopper portion 153A on each of the multiple intermediate layer metal plates 153.

[0042] Although one embodiment of the present invention has been described in detail above, the present invention is not limited to these embodiments, and various modifications or changes are possible within the scope of the gist of the present invention as described in the claims.

[0043] This international application claims priority based on Japanese Patent Application No. 2022-114922, filed on 19 July 2022, and the entire contents of said application are incorporated herein by reference. [Explanation of Symbols]

[0044] 100,100-2 Push switch 110 Insulators 111 Ridge 120 Pressing body 130 Second movable contact member 130A top 140 Insulating Sheets 141 Opening 150 Movable contact member 150A top 151 Bottom metal plate 151A Rotation stopper 152 Top layer metal plate 153 Intermediate layer metal plate 153A Rotation stopper 160 Housing 160A top 160B First containment area 160C bottom 161 Central fixed contact 162 Peripheral fixed contacts 163 Second Detention Unit

Claims

1. A housing having a first storage section, A central fixed contact provided at the bottom of the first housing section, A movable contact member is placed within the first housing and, upon receiving a pressing force from above, reverses direction so that its central portion contacts the central fixed contact, A cover member that covers the upper part of the first housing section and Equipped with, The aforementioned movable contact member is constructed by stacking multiple metal plates. Of the plurality of metal plates, the lowest layer metal plate, which is positioned at the bottom, has a rotation-preventing portion that protrudes outward from its outer edge. The housing has a second housing portion that accommodates the rotation-preventing portion, and the rotation-preventing portion abuts against the inner wall surface of the second housing portion, thereby preventing the rotation of the bottom metal plate. Of the plurality of metal plates, the uppermost metal plate, which is positioned at the very top, does not have the rotation stopper. A pressing member is provided between the cover member and the uppermost metal plate, and by pressing down on the surface of the uppermost metal plate from above, the pressing member prevents the rotation of the uppermost metal plate. The retaining member is an insulating sheet that covers the movable contact member. A push switch characterized by the following features.

2. A housing having a first housing portion, A central fixed contact provided at the bottom of the first housing section, A movable contact member is placed within the first housing and, upon receiving a pressing force from above, reverses direction so that its central portion contacts the central fixed contact, A cover member that covers the upper part of the first housing section and Equipped with, The aforementioned movable contact member is constructed by stacking multiple metal plates. Of the plurality of metal plates, the lowest layer metal plate, which is positioned at the bottom, has a rotation-preventing portion that protrudes outward from its outer edge. The housing has a second housing portion that accommodates the rotation-preventing portion, and the rotation-preventing portion abuts against the inner wall surface of the second housing portion, thereby preventing the rotation of the bottom metal plate. Of the plurality of metal plates, the uppermost metal plate, which is positioned at the very top, does not have the rotation stopper. A pressing member is provided between the cover member and the uppermost metal plate, and by pressing down on the surface of the uppermost metal plate from above, the pressing member prevents the rotation of the uppermost metal plate. The movable contact member is The system includes an intermediate metal plate positioned between the bottommost metal plate and the topmost metal plate, The intermediate layer metal plate has the rotation stopper portion A push switch characterized by the following features.

3. The movable contact member has a dome-shaped portion, The pressing member is a pressing body that presses against the top of the dome-shaped portion of the movable contact member. The push switch according to feature 2.

4. The external shape of the movable contact member is substantially circular. The push switch according to claim 1 or 2.

5. The rotation-stopping portion extends horizontally from the outer peripheral edge of the lowest layer metal plate. The push switch according to claim 1 or 2.

6. The bottommost metal plate has two rotation-stopping parts arranged symmetrically. The push switch according to claim 1 or 2.

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