WO2018142752A1

WO2018142752A1 - Push switch

Info

Publication number: WO2018142752A1
Application number: PCT/JP2017/043525
Authority: WO
Inventors: 暢章北村; 秀隆佐藤; 尭也坂本
Original assignee: アルプス電気株式会社
Priority date: 2017-02-02
Filing date: 2017-12-04
Publication date: 2018-08-09
Also published as: KR20190091363A; JPWO2018142752A1; CN110291604B; KR102171896B1; CN110291604A; JP6965285B2

Abstract

The push switch of the present application comprises: a movable contact point (20) which is formed from metal and which is deformable; and a case (30) having formed therein a recessed portion (31) in which the movable contact point (20) is put, and being formed by integrating a central fixed contact portion (50), a peripheral fixed contact portion (60), and a resin member (70) with one another. From the bottom surface of the recessed portion (31) of the case, surfaces of the central fixed contact portion (50) and the peripheral fixed contact portion (60) are exposed. The central fixed contact portion (50) is provided with a central contact point (51, 52). An extension portion (50c) is provided in the surrounding area of the central contact point (51, 52). At the rear surface side of the extension portion (50c) of the central fixed contact portion (50), through holes (81-84) are formed in the resin member (70).

Description

Push switch

The present invention relates to a push switch.

In recent years, electronic devices have been miniaturized, and these electronic devices are provided with push switches for performing input operations in the electronic devices. However, these push switches are also required to be small and thin. It has been.

One of such push switches has a case where two fixed contact portions are integrated with a resin member, a movable contact, a sheet, and the like. In such a push switch, when the central portion of the sheet is not pressed, the two fixed contact portions are not in contact with the movable contact and are in an off state. The two fixed contact portions are in contact with each other, and the two fixed contact portions are electrically connected via the movable contact to be turned on.

The case of such a push switch is formed by insert molding. For example, the case is formed by pouring and melting a molten resin material in a state where two fixed contact portions are pressed from above and below by a mold. Specifically, the lower sides of the two fixed contact portions are supported from below by pins, and the upper sides of the two fixed contact portions are formed by supplying a resin material while being pressed by the upper mold. Is done. For this reason, a through hole having a shape corresponding to the shape of the pin supported from below is formed below the two fixed contact portions in the resin member of the case formed by insert molding. In addition, the upper part of the two fixed contact portions is exposed by a portion pressed by the upper mold.

The push switch manufactured in this way can be attached by soldering the external terminal of the fixed contact portion exposed from the case to an electrode terminal of an electronic device or the like.

JP 2014-154343 A JP 2016-27533 A Japanese Patent Publication No. 61-23680 Japanese Utility Model Publication No. 63-14347 Japanese Examined Patent Publication No. 7-56768

By the way, in a case formed by insert molding, a slight gap may occur between the fixed contact portion and the resin member for various reasons. On the other hand, when soldering the push switch, a flux is used. When the flux is heated, the viscosity becomes low and the fluidity becomes high. For this reason, when soldering, the flux may spread from the back side of the case to the front side of the fixed contact portion through the through hole. After soldering, the flux is solidified because it is not heated, but the solidified flux is highly insulative. Therefore, if the surface of the fixed contact portion is covered with the hardened flux, the fixed contact portion and the movable contact are not electrically connected and may not function as a switch.

For this reason, there is a demand for a push switch having a structure in which the flux does not reach the surface of the fixed contact portion when soldering.

According to one aspect of the present embodiment, the deformable movable contact made of metal, the central fixed contact portion, the peripheral fixed contact portion, and the resin member are integrated to form a recess into which the movable contact is inserted. A surface of the central fixed contact portion and the peripheral fixed contact portion are exposed at the bottom surface of the concave portion of the case, and the central fixed contact portion is provided with a central contact, An extending portion is provided around the center contact, and a through hole is formed in the resin member on the back surface side of the extending portion of the center fixed contact portion.

According to the disclosed push switch, when soldering, the flux can be prevented from reaching the surface of the fixed contact portion, and the reliability of the soldered push switch can be improved.

External perspective view of the push switch in the present embodiment Exploded perspective view of push switch in the present embodiment Top view of push switch in this embodiment Side view of push switch in this embodiment Top view of the center fixed contact part and the peripheral fixed contact part of the push switch Perspective view of the center fixed contact part and the peripheral fixed contact part of the push switch Top view of push switch case Perspective view of push switch case Cross-sectional view of the push switch in this embodiment Bottom view of push switch case Perspective view of push switch resin member Cross-sectional view of through-hole formed in resin member Top view of through-hole formed in resin member Explanatory drawing of the position of the through hole Explanatory drawing of push switch in this embodiment

The form for carrying out will be described below. In addition, about the same member etc., the same code | symbol is attached | subjected and description is abbreviate | omitted. In the present application, the X1-X2 direction, the Y1-Y2 direction, and the Z1-Z2 direction are directions orthogonal to each other. A plane including the X1-X2 direction and the Y1-Y2 direction is referred to as an XY plane, a plane including the Y1-Y2 direction and the Z1-Z2 direction is referred to as a YZ plane, and the Z1-Z2 direction and the X1-X2 direction are referred to as YZ plane. The plane including the surface is referred to as a ZX plane.

The push switch in the present embodiment has a sheet 10, a movable contact 20, a case 30, and the like as shown in FIGS. 1 is an overall perspective view of the push switch according to the present embodiment, FIG. 2 is an exploded perspective view, FIG. 3 is a top view, and FIG. 4 is a side view.

The sheet 10 is formed of an insulating resin material such as nylon resin. The movable contact 20 is made of a metal material such as stainless steel, and is deformed by being pushed from above via the sheet 10. In addition, silver plating or the like for enhancing conductivity is applied to the lower side of the movable contact 20. The case 30 is formed by insert molding, and the central fixed contact portion 50 and the peripheral fixed contact portion 60 are integrated with the resin member 70. This push switch has a substantially rectangular top surface as viewed from above, and has a longitudinal width W1 in the X1-X2 direction of about 3 mm and a short-side width W2 in the Y1-Y2 direction of about 1. 9 mm and the height H1 in the Z1-Z2 direction is about 0.55 mm. The resin member 70 of the case 30 has a substantially rectangular top surface as viewed from above, a longitudinal width W3 corresponding to the X1-X2 direction is approximately 2.8 mm, and a lateral width in the Y1-Y2 direction. Is formed so that the width W2 in the short direction of the push switch is about 1.9 mm, and the height H2 in the Z1-Z2 direction is about 0.335 mm.

In the push switch in the present embodiment, the center fixed contact portion 50 and the movable contact 20 are not in contact with each other and are in the off state when the center portion of the sheet 10 is not pressed. By pushing the central portion of the sheet 10 of the push switch, the deformed movable contact 20 comes into contact with the central fixed contact portion 50 and the peripheral fixed contact portion 60 provided on the case 30. The movable contact 20 is made of a metal material such as stainless steel, and the lower surface of the movable contact 20 is plated with highly conductive silver or the like. Accordingly, when the central fixed contact portion 50 and the peripheral fixed contact portion 60 provided on the case 30 come into contact with the lower surface of the movable contact 20, the central fixed contact portion 50 and the peripheral fixed contact are interposed via the movable contact 20. The unit 60 is electrically connected and is turned on.

When the force pushing the central portion of the seat 10 of the push switch disappears, the movable contact 20 returns to its original state by its own restoring force, and the center fixed contact portion 50 and the movable contact 20 are separated from each other. Become.

Next, the central fixed contact portion 50 and the peripheral fixed contact portion 60 forming the case 30 will be described with reference to FIGS.

First, the center fixed contact portion 50 will be described. The center fixed contact portion 50 is formed by punching out a single metal plate and performing a process such as bending. The central fixed contact portion 50 is connected to the central portion 50a where the first central contact 51 and the second central contact 52 are provided, and to the central portion 50a, and extends along the longitudinal direction, that is, the X1-X2 direction.

Terminal portions

53 and 54 are provided at both ends in the longitudinal direction of the connection portion 50b. The first center contact 51 and the second center contact 52 are formed by processing in a convex shape upward (Z1 direction side), the X1-X2 direction is the longitudinal direction, and the Y1-Y2 direction is short. It is a hand direction. The first center contact 51 and the second center contact 52 are formed to face each other in the Y1-Y2 direction. The first center contact 51 is on the Y1 direction side, and the second center contact 52 is on the Y2 direction. On the side. An extended portion 50c is formed around the first central contact 51 and the second central contact 52 of the central portion 50a, and the X1-X2 direction which is the longitudinal direction of the push switch in the extended portion 50c The

extended support portions

55 and 56 are formed.

The extended support portion 55 is formed on the X1 direction side of the first center contact 51 and the second center contact 52. The extended support portion 56 is formed on the X2 direction side of the first center contact 51 and the second center contact 52. The distance from the first center contact 51 and the second center contact 52 to the end portion 55a of the extension support portion 55 or the end portion 56a of the extension support portion 56 is equal to the first center contact 51 and the second center contact. It is longer than the distance from 52 to the end of the other region of the central portion 50a of the central fixed contact portion.

Accordingly, the central portion 50 a of the central fixed contact portion 50 is provided with the first central contact 51 and the second central contact 52 and the extension formed around the first central contact 51 and the second central contact 52. The extension support part 55 and the extension support part 56 are a part of the extension part 50c.

In the vicinity of the end portion 55a of the extended support portion 55 and in the vicinity of the end portion 56a of the extended support portion 56, the center portion 50a of the central fixed contact portion 50 is fixed to the resin member 70 by insert molding.

Portions

55b and 56b are formed. The bent portion 55b formed in the vicinity of the end portion 55a of the extended support portion 55 is first bent in the vicinity of the end portion 55a of the extended support portion 55 in the Z2 direction along the Y1-Y2 direction. The portion closer to the end 55a than this is formed by bending in the X1 direction along the Y1-Y2 direction. The bent portion 56b formed in the vicinity of the end portion 56a of the extended support portion 56 is first formed by bending the vicinity of the end portion 56a of the extended support portion 56 in the Z2 direction along the Y1-Y2 direction. Further, a portion closer to the end portion 56a than this is bent in the X2 direction along the Y1-Y2 direction.

Further, in the central portion 50a of the central fixed contact portion 50, a portion between the first central contact 51 and the second central contact 52 is a concave portion 57, and the concave portion 57 extends in the X1-X2 direction. In addition, an extended support portion 55 and an extended support portion 56 are formed at the tip of the X1-X2 direction. Therefore, the first center contact 51 and the second center contact 52 of the center fixed contact portion 50 are formed between the extended support portion 55 and the extended support portion 56. Further, the Y1-Y2 direction in which the first central contact 51 and the second central contact 52 face each other, and the X1-X2 direction in which the extended support portion 55 and the extended support portion 56 are provided. Orthogonal.

Next, as shown in FIGS. 5 and 6, the peripheral fixed contact portion 60 will be described. Similarly to the central fixed contact portion 50, the peripheral fixed contact portion 60 is also formed by punching one metal plate and processing it such as bending. The peripheral fixed contact portion 60 is provided with a first peripheral contact 61 on the X1 direction side from the central portion 50a of the central fixed contact portion 50, and a second peripheral contact 62 on the X2 direction side. Is provided. Specifically, the peripheral fixed contact portion 60 is provided with a first peripheral contact 61 on the X1 direction side with respect to the extended support portion 55, and on the X2 direction side with respect to the extended support portion 56. Is provided with a second peripheral contact 62.

Terminal portions

63 and 64 are provided at both ends in the longitudinal direction of the peripheral fixed contact portion 60, that is, in the X1-X2 direction. The 1st peripheral contact 61 and the 2nd peripheral contact 62 are formed by processing on the upper side (Z1 direction side) convex shape, the 1st peripheral contact 61, the 2nd peripheral contact 62, and a terminal The

parts

63 and 64 are connected by a connection part 65.

Next, the case 30 will be described. The case 30 is formed by insert molding using the center fixed contact portion 50 and the peripheral fixed contact portion 60. In the present application, a portion formed of a resin material in the case 30 formed by insert molding is referred to as a resin member 70. The case 30 has a concave portion 31 formed on the upper side where the movable contact 20 is disposed, and a first central contact 51 and a second central contact 52 of the central fixed contact portion 50 are provided at the center of the bottom surface 31 a of the concave portion 31. A part of the

extended support portions

55 and 56 is exposed. Further, on the bottom surface 31a of the recess 31 of the case 30, the first peripheral contact 61 is exposed on the X1 direction side from the first central contact 51 and the second central contact 52, and on the X2 direction side. The second peripheral contact 62 is exposed. Although not shown, a part of the bent part 55b formed near the end part 55a of the extended support part 55 and a part of the bent part 56b formed near the end part 56a of the extended support part 56 are partially shown. Is embedded in the resin member 70.

In the present application, the surface where the central fixed contact portion 50 is exposed in the recess 31 of the case 30 may be referred to as the front surface, and the surface covered with the resin member 70 on the opposite side to the front surface may be referred to as the back surface. . In addition, the surface of the concave portion 31 of the case 30 where the peripheral fixed contact portion 60 is exposed may be referred to as the front surface, and the surface covered with the resin member 70 on the opposite side to the front surface may be referred to as the back surface. Note that the terminal portion 53 of the central fixed contact portion 50 and the terminal portion 63 of the peripheral fixed contact portion 60 are exposed on the X1 direction side on the back side of the case 30, and the central fixed contact portion 50 of the central fixed contact portion 50 is exposed on the X2 direction side. The terminal portion 54 and the terminal portion 64 of the peripheral fixed contact portion 60 are exposed.

In the present embodiment, as shown in FIG. 9, the movable contact 20 is placed in the concave portion 31 of the case 30 so as to be convex upward, and the top of the movable contact 20 is covered with the sheet 10. Yes. A projection 11 is provided on the surface of the sheet 10 on the movable contact 20 side. The movable contact 20 has a convex surface 20 a on the upper side and a concave surface 20 b on the lower side, and is disposed so that the concave surface 20 b of the movable contact 20 faces the bottom surface 31 a of the concave portion 31 of the case 30. Therefore, the peripheral portion 21 a around the movable contact 20 is in contact with the first peripheral contact 61 of the peripheral fixed contact portion 60, and the peripheral portion 21 b is in contact with the second peripheral contact 62 of the peripheral fixed contact portion 60. ing. The concave surface 20b of the movable contact 20 is an inner surface of the movable contact 20, and the concave surface 20b is plated with silver (not shown).

In the state in which the sheet 10 is not pushed, the movable contact 20 is not in contact with the first central contact 51 of the central fixed contact portion 50 and the like, as shown in FIG. The first peripheral contact 61 and the second peripheral contact 62 are not electrically connected to the first central contact 51 and the like of the central fixed contact portion 50 and are in an off state. This push switch is turned on by pressing the sheet 10 in the Z2 direction. That is, when the sheet 10 is pushed in the Z2 direction, the sheet 10 and the movable contact 20 are deformed, and the concave surface 20b of the central portion 22 of the movable contact 20 contacts the first central contact 51 of the central fixed contact portion 50 and the like. To do. As a result, the first peripheral contact 61 and the second peripheral contact 62 of the peripheral fixed contact portion 60 and the first central contact 51 of the central fixed contact portion 50 are electrically connected via the movable contact 20 and turned on. It becomes a state.

By the way, the case 30 is formed by insert molding. Specifically, the center fixed contact portion 50 and the peripheral fixed contact portion 60 are supported by a die or the like on the front side and a pin on the back side. It is formed by pouring molten resin material. For this reason, as shown in FIG. 10, the back surface 32 of the case 30 has through holes 81 to 84 and openings 85 to 85 on the pins that have supported the central fixed contact portion 50 and the peripheral fixed contact portion 60 from the back surface side. 88 is formed. That is, through holes 81 to 84 and openings 85 to 88 are formed in the resin member 70 on the back surface side of the central fixed contact portion 50 and the peripheral fixed contact portion 60. FIG. 11 is a perspective view of the resin member 70 in a state where the central fixed contact portion 50 and the peripheral fixed contact portion 60 are removed from the case 30 formed by insert molding, as viewed from the front side. The through holes 81 and 82 are formed on the back surface side of the central fixed contact portion 50, and the through

holes

83 and 84 are formed on the back surface side of the peripheral fixed contact portion 60.

Specifically, the through

holes

81 and 82 are formed by pins that supported the central portion 50a of the central fixed contact portion 50 from the back side. Further, a through hole 83 is formed by a pin that supports the vicinity of the first peripheral contact 61 of the peripheral fixed contact portion 60 from the back surface side, and the vicinity of the second peripheral contact 62 of the peripheral fixed contact portion 60 indicates the back surface side. The through hole 84 is formed by the pin that has been supported more. Further,

openings

85 and 86 are formed by pins supporting the connection portion 50b of the central fixed contact portion 50 from the back surface side, and openings are formed by pins supporting the connection portion 65 of the peripheral fixed contact portion 60 from the back surface side.

Portions

87 and 88 are formed.

As shown in FIGS. 12 and 13, the through hole 81 has a first stepped portion 81 a and a second stepped portion from the back surface 32 of the case 30 toward the back side of the extended support portion 55 of the central fixed contact portion 50. The part 81b and the penetrating part 81c are formed in this order. The first step portion 81a has a substantially rectangular shape with an outer shape of the bottom surface 81d of about 300 μm × 400 μm, and is formed so that the depth d1 is 20 μm to 30 μm. The second step portion 81b is formed so that the outer shape of the bottom surface 81e is a substantially circular shape having a diameter of about 130 μm, and the depth d2 is 20 μm to 30 μm. The penetrating portion 81c is formed in a substantially circular shape having a diameter of about 100 μm at the widest portion of the hole. As the distance from the back surface 32 of the case 30, the size of the hole becomes narrower, and the shape of the hole is tapered. It has become. Therefore, the through-hole 81 is formed in the first step portion 81a formed on the back surface 32 of the case 30 and the second step formed narrower than the first step portion 81a and deeper than the first step portion 81a. The step portion 81b is formed by a through portion 81c formed at a position narrower than the second step portion 81b and deeper than the second step portion 81b.

In the present embodiment, the length of the shortest portion of the bottom surface 81d of the first step portion 81a between the first step portion 81a and the second step portion 81b of the through hole 81 (the shortest bottom surface of the bottom surface 81d). The length L1 of the portion is formed to be longer than the depth d1 of the first step portion 81a. Further, the length L2 of the bottom surface 81e of the second step portion 81b between the second step portion 81b and the penetrating portion 81c (the length of the bottom surface portion of the bottom surface 81e) L2 is the depth of the second step portion 81b. It is formed to be longer than d2. By making the length L1 of the shortest portion of the bottom surface 81d of the first step 81a between the first step 81a and the second step 81b longer than the depth d1 of the first step 81a. The flux that has entered the first step portion 81a is difficult to reach the second step portion 81b, and even if the flux reaches, it takes time, so the flux that enters the second step portion 81b is reduced. Can do. Further, the length L2 of the bottom surface 81e of the second step portion 81b between the second step portion 81b and the penetrating portion 81c is made longer than the depth d2 of the second step portion 81b. The flux that has entered the stepped portion 81b is less likely to reach the through portion 81c, and even if the flux reaches, it takes time, so the flux that enters the through portion 81c can be reduced.

Since the case 30 is formed by insert molding, there may be a slight gap between the central fixed contact portion 50 and the resin member 70. For this reason, the flux is applied to the through portion 81c of the through hole 81. If it enters, it may enter into a slight gap between the center fixed contact portion 50 and the resin member 70 and spread. However, since the push switch in the present embodiment can reduce the flux that enters the through portion 81 c of the through hole 81, the flux reaches the first central contact 51 and the second central contact 52 of the central fixed contact portion 50. Can be suppressed, and the yield of the push switch after soldering can be increased. The through hole 82 is the same as the through hole 81.

In the present embodiment, the length L1 of the shortest portion of the bottom surface 81d of the first step portion 81a between the first step portion 81a and the second step portion 81b is approximately 75 μm, and the second step portion The length L2 of the bottom surface 81e of the second step portion 81b between the portion 81b and the penetrating portion 81c is formed to be about 25 μm.

Next, the positions where the through

holes

81 and 82 are formed in the push switch according to the present embodiment will be described with reference to FIGS. FIG. 14 is a view of the case 30 that has passed through the resin member 70 as viewed from the back side in order to explain the positions of the through

holes

81 and 82. In the present embodiment, the through hole 81 is formed on the back side of the extended support portion 55 of the central portion 50 a of the central fixed contact portion 50, and the through hole 82 is formed on the central portion 50 a of the central fixed contact portion 50. It is formed on the back side of the extended support portion 56.

In the present embodiment, the line connecting the through hole 81 and the through hole 82 passes between the first center contact 51 and the second center contact 52 of the center fixed contact portion 50. That is, the line connecting the center of the through hole 81 and the center of the through hole 82 indicated by the broken line A is parallel to the X1-X2 direction, and this line is connected to the first central contact 51 in the central fixed contact portion 50. It is located between the second central contact 52.

For this reason, even if the flux enters the through hole 81, the flux is located between the back side of the central fixed contact portion 50 and the resin member 70 from the through hole 81, as shown by the broken line arrow B in FIG. 15. After turning around the gap to the left side, it goes around the end 55a, and if the gap between the front side of the center fixed contact portion 50 and the resin member 70 is not turned around to the right side, the first center contact 51 and the second center contact 51 The central contact 52 is not reached. Similarly, even if the flux enters the through hole 82, the flux forms a gap between the back side of the central fixed contact portion 50 and the resin member 70 from the through hole 82, as indicated by a broken line arrow C in FIG. 15. The first central contact 51 or the second central contact is required unless it goes around the end portion 56a and then goes around the gap between the front side of the central fixed contact portion 50 and the resin member 70 to the left side. 52 is not reached.

In the present embodiment, the extended support portion 55 is a distance from the first central contact 51 or the second central contact 52 to the end portion 55a rather than the other portion of the central portion 50a of the central fixed contact portion 50. Is formed long. For this reason, even if flux enters, the approach path is long, and the flux cannot easily reach the first central contact 51 and the second central contact 52. Similarly, the extended support portion 56 is formed such that the distance from the first center contact 51 or the second center contact 52 to the end portion 56a is longer than the other portions of the center portion 50a of the center fixed contact portion 50. ing. For this reason, even if flux enters, the approach path is long, and the flux cannot easily reach the first central contact 51 and the second central contact 52.

Further, in the present embodiment, a bent portion 55 b is formed in the vicinity of the end portion 55 a of the extended support portion 55. Since the bent portion 55b is formed by bending a metal plate, the bent portion 55b has a surface that is bent rather than flat. As described above, since the wetting and spreading of the flux is suppressed on the bent surface as compared with the flat surface, the flux can be prevented from reaching the first center contact 51 and the second center contact 52. Further, a bent portion 56 b is formed in the vicinity of the end portion 56 a of the extended support portion 56. Since the bent portion 56b is formed by bending a metal plate, the bent portion 56b has a bent surface rather than a flat surface. As described above, since the wetting and spreading of the flux is suppressed on the bent surface as compared with the flat surface, the flux can be prevented from reaching the first center contact 51 and the second center contact 52.

As mentioned above, although embodiment was explained in full detail, it is not limited to specific embodiment, A various deformation | transformation and change are possible within the range described in the claim.

Note that this international application claims priority based on Japanese Patent Application No. 2017-017945 filed on Feb. 2, 2017, the entire contents of which are incorporated herein by reference.

DESCRIPTION OF SYMBOLS 10 Sheet 20

Movable contact

21a, 21b Peripheral part 22 Center part 30 Case 31 Recessed part 31a Bottom face 32 Back surface 50 Center fixed contact part

50a Center part

50b Connection part

50c Extension part 51 1st center contact 52 2nd center contact 53 Terminal Part 54 terminal part 55 extension support part 56 extension support part 57 recess 60 peripheral fixed contact part 61 first peripheral contact 62 second peripheral contact 63 terminal part 64 terminal part 65 connection part 70 resin member 81 through-hole 81a first One step portion 81b Second step portion 81c Through portion

81d Bottom surface

81e Bottom surface 82 Through

hole

83, 84 Through holes 85 to 88 Opening portion

Claims

A deformable movable contact made of metal;
A case in which a central fixed contact portion and a peripheral fixed contact portion and a resin member are integrated, and a recess into which the movable contact is formed;
Have
On the bottom surface of the recess of the case, the surfaces of the central fixed contact portion and the peripheral fixed contact portion are exposed,
The center fixed contact portion is provided with a center contact, and an extending portion is provided around the center contact.
The push switch is characterized in that a through hole is formed in the resin member on the back surface side of the extended portion of the central fixed contact portion.
An extension support part is provided in the extension part of the central fixed contact part,
The push switch according to claim 1, wherein the through hole is provided on a back surface side of the extended support portion.
A bent part is formed at the end of the extended support part,
The push switch according to claim 2, wherein a part of the bent portion enters the resin member.
Two central contacts are provided,
Two through holes are provided in the resin member on the back surface of the extended portion of the central fixed contact portion,
The push switch according to any one of claims 1 to 3, wherein the two through holes are formed so that a line connecting the two through holes passes between the two central contacts.
The through hole has a first step formed from the back side of the resin member;
A second step formed narrower than the first step and deeper than the first step;
A through portion formed narrower than the second step portion and deeper than the second step portion;
The push switch according to claim 1, comprising:
The length of the bottom surface portion of the first step portion between the first step portion and the second step portion is formed longer than the depth of the first step portion,
The length of the bottom surface portion of the second step portion between the second step portion and the penetrating portion is longer than the depth of the second step portion. 5. The push switch according to 5.