JP2019091579A - Switch device - Google Patents

Abstract

To reduce a flux rise caused by expansion and contraction of air in a storage part due to a reflow solder.SOLUTION: A switch device includes a movable contact member, a fixed contact member having a fixed contact part cooperating with the movable contact member and a connection terminal part soldered to an external circuit, a resin part which forms a recessed storage part that is joined to the fixed contact member, is opened on one side in a first direction and stores the movable contact member, in which the fixed contact part is exposed in the storage part and the connection terminal part is exposed to the external surface, and has a projection part projecting to the other side on the surface on the other side, in which the projection part has a hole communicating a space in the storage part and an external space of the resin part, and an opening position on the external space side of the hole is different from the position of the connection terminal part in the first direction.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a switch device.

  A fixed contact member having an external connection terminal to be soldered and a contact portion to which an electrical connection state is switched, wherein the remaining amount of flux contained in the solder penetrates from the external connection terminal to the contact portion A switch device having a structure that avoids

JP, 2015-008084, A

  By the way, in the switch device as in the above-mentioned prior art, the housing portion in which the fixed contact is positioned and the movable contact is accommodated is a substantially sealed space, but a slight space between the fixed contact member and the resin portion There is a gap. For this reason, when reflow soldering is performed, the air in the housing portion expands, and at that time, part of the air is released to the outside from the gap between the fixed contact member and the resin portion. Thereafter, the air in the housing cools and contracts, and at this time, the outside air slightly intrudes from the gap into the housing. Such expansion and contraction exerts a pump-like effect and wicks the flux from the gap between the fixed contact member and the resin portion into the housing portion, which is one of the main causes of so-called fluxing. The flux buildup can cause inconveniences such as contact failure.

  Therefore, in one aspect, the present invention aims to reduce the flux buildup due to the expansion and contraction of air in the housing portion accompanying reflow soldering.

In one aspect, a movable contact member,
A stationary contact member having a stationary contact portion cooperating with the movable contact member, and a connection terminal portion soldered to an external circuit;
A concave-shaped housing portion is formed which is joined to the fixed contact member and opened on one side in a first direction to receive the movable contact member, and the fixed contact portion is exposed in the housing portion and the outer surface And a resin portion having a projection on the other side surface that protrudes to the other side.
The projecting portion has a hole for communicating the space in the housing portion with the external space of the resin portion,
A switch device is provided in which the opening position on the external space side of the hole is different from the position of the connection terminal in the first direction.

  In one aspect, according to the present invention, it is possible to reduce the flux rise due to the expansion and contraction of air in the housing portion accompanying reflow soldering.

1 is an exploded perspective view showing a switch device according to one embodiment. It is a perspective view which shows the integral molding of a resin part and a fixed contact member. It is a side view which shows an example of the mounting state of a switch apparatus. It is the perspective view which looked the stationary contact member from the upper side. It is the perspective view which looked the stationary contact member from lower side.

  Hereinafter, each example will be described in detail with reference to the attached drawings.

  FIG. 1 is an exploded perspective view showing a switch device according to one embodiment, in which three orthogonal axes X, Y, Z are defined. The Z direction (an example of the first direction) corresponds to the thickness direction of the switch device 1, and in the following, the positive side in the Z direction is referred to as "upper side" for the sake of description. Also, in the following, unless stated otherwise, the terms "inner" and "outer" are used with reference to the center C of the switch device 1 when viewed in the Z direction. For example, the inside indicates the side closer to the center C of the switch device 1. In the following, unless otherwise stated, the outside refers to the outside of the switch device 1.

  FIG. 2 is a perspective view showing an integrally molded product of a resin portion and a fixed contact member. FIG. 3 is a cross-sectional view showing an example of the mounting state of the switch device. FIG. 3 is a cross-sectional view along the XZ plane passing through the center C of the switch device 1. In FIG. 3, an alternate long and short dash line I represents a central axis passing through the center C and parallel to the Z axis. FIG. 4A is a perspective view of the fixed contact member 20 as viewed from the upper side, and FIG. 4B is a perspective view of the fixed contact member 20 as viewed from the lower side.

  As shown in FIG. 3, the switch device 1 is mounted on a substrate 50 of an electronic device (not shown) and electrically connected to an electric circuit (not shown) on the substrate 50. The electronic device is optional, but may be, for example, a portable terminal such as a smartphone, an on-vehicle electronic device, or the like.

  The switch device 1 includes a movable contact member 10, a fixed contact member 20, a resin portion 30, and a sealing member 40.

  The movable contact member 10 is formed of a conductive material (for example, a metal material). The movable contact member 10 has elasticity and is movable by being elastically deformed. Specifically, the movable contact member 10 is formed in a dome shape by a thin plate, and can be reversely operated. The movable contact member 10 can provide the user with a "operation feeling (click feeling)" when performing the reverse operation. In the example shown in FIG. 1, the movable contact member 10 is formed, for example, by superposing three similar dome-shaped thin plates. In the present embodiment, as an example, the movable contact member 10 has a dome-shaped top near the center C of the switch device 1.

  The stationary contact member 20 has a stationary contact portion cooperating with the movable contact member 10. The fixed contact member 20 has a connection terminal 24 soldered to an electrode (not shown) of the electrical circuit on the substrate 50. The solder 7 for joining the connection terminals 24 is schematically shown in FIG. In the present embodiment, as an example, the fixed contact member 20 is composed of two members, and the fixed contact portion includes the central contact portion 2110 and the outer peripheral contact portion 2120, and the connection terminal 24 includes the first connection terminal 2401 and the second connection terminal 2401. And a connection terminal 2402.

  Specifically, as shown in FIG. 2, the fixed contact member 20 includes a central contact forming member 211 and an outer peripheral contact forming member 212. The central contact forming member 211 and the outer peripheral contact forming member 212 are formed of a conductive material (for example, a metal material). The central contact forming member 211 and the outer peripheral contact forming member 212 in the embodiments described below can be formed of sheet metal.

  As shown in FIGS. 4A and 4B, the central contact formation member 211 forms a central contact portion 2110, a connection portion 2300, a tip portion 2301, and a first connection terminal 2401.

  The central contact portion 2110 is a portion where a movable contact member 10 can form a fixed contact (hereinafter also referred to as a “central contact” for distinction) to which the movable contact member 10 can move. The upper surface of the central contact portion 2110 is exposed from the resin portion 30 and faces the movable contact member 10 in the vertical direction. In the present embodiment, the switch device 1 is, for example, a normally open type, and in the normal state, the movable contact member 10 is in contact with the outer peripheral contact portion 2120 described later. The central contact portion 2110 and the outer peripheral contact portion 2120 are not electrically connected. That is, the switch device 1 is turned off. When the user pushes the movable contact member 10 downward, the movable contact member 10 contacts the central contact portion 2110, and the central contact portion 2110 and the outer peripheral contact portion 2120 are electrically connected via the movable contact member 10, and the switch The device 1 is turned on (conductive).

  The central contact portion 2110 is formed near the center C of the switch device 1. However, in the modification, the central contact portion 2110 may be formed to be offset from the center C. In the present embodiment, as an example, the central contact portion 2110 has a circular outer shape, has two semicircular convex portions 2112, and has an outer periphery on the circular outer peripheral side formed by the two convex portions 2112. The portion 2111 extends. The convex portion 2112 is convex above the surface of the outer peripheral portion 2111 and can function as a substantial contact (central contact) with the movable contact member 10.

  The connecting portion 2300 is formed from one end (the end on the right side in FIG. 4A) of the central contact portion 2110 in the X direction. The connection portion 2300 extends in the X direction, and connects the central contact portion 2110 and the first connection terminal 2401. In the present embodiment, as an example, the connection portion 2300 is connected in the vicinity of the center of each of the central contact portion 2110 and the first connection terminal 2401 in the Y direction. The width in the Y direction of the connection portion 2300 is significantly smaller than the width in the Y direction of the central contact portion 2110 or the width in the Y direction of the first connection terminal 2401. The connection portion 2300 is, as shown in FIGS. 2 and 3, included in the resin portion 30 in such a manner that substantially the entire portion is embedded in the resin portion 30.

  The tip portion 2301 is formed from the other end (the end on the left side in FIG. 4A) of the center contact portion 2110 in the X direction. That is, the tip end portion 2301 is formed at the end portion in the X direction of the central contact portion 2110 and at the end portion on the opposite side to the side connected to the connection portion 2300. The distal end portion 2301 is included in the resin portion 30 in such a manner that substantially the whole thereof is buried in the resin portion 30 as shown in FIGS. 2 and 3. The distal end portion 2301 can be firmly joined to the resin portion 30 by being contained in the resin portion 30 as in the connection portion 2300. Thereby, the tip end portion 2301 cooperates with the connection portion 2300 to enhance bonding (adhesion) between the central contact portion 2110 and the resin portion 30 which are between the tip end portion 2301 and the connection portion 2300 in the X direction. It has a function. Hereinafter, the function by such a connection part 2300 and tip part 2301 is called an adhesiveness increase function. In the central contact portion 2110, only the lower surface is joined to the resin portion 30, so that the adhesion increasing function by the tip portion 2301 is effective.

  The first connection terminal 2401 is formed on one side in the X direction (right side in FIG. 2). The first connection terminal 2401 is exposed from the resin portion 30 in the X direction.

  The outer peripheral contact forming member 212 does not make direct contact with the central contact forming member 211, and electrically connects only through the movable contact member 10. Specifically, in a state where the movable contact member 10 is in contact with the central contact portion 2110, the outer peripheral contact formation member 212 is electrically connected to the central contact formation member 211 via the movable contact member 10. Further, in a state where the movable contact member 10 is separated from the central contact portion 2110, the outer peripheral contact formation member 212 is electrically disconnected from the central contact formation member 211. In the switch device 1, the two states can be electrically taken out via the connection terminal 24 as the on / off signal.

  The outer peripheral contact formation member 212 forms an outer peripheral contact portion 2120, a connection portion 2302, and a second connection terminal 2402, as shown in FIGS. 4A and 4B.

  The outer peripheral contact portion 2120 is a portion surrounding the central contact portion 2110 and extends in a region surrounding the central contact portion 2110. In the present embodiment, as an example, the outer peripheral contact portion 2120 is configured to surround the central contact portion 2110, and surrounds the central contact portion 2110 except for a region through which the connection portion 2300 passes.

  In the outer peripheral contact portion 2120, the upper surface of the resin portion 30 is exposed. The movable contact member 10 is placed on the upper surface of the outer peripheral contact portion 2120. The outer peripheral contact portion 2120 vertically abuts on the lower edge portion of the outer periphery of the movable contact member 10. Therefore, the outer peripheral contact portion 2120 is a portion that forms a fixed contact (hereinafter also referred to as “an outer peripheral contact” for distinction) which the movable contact member 10 always contacts. In this embodiment, as an example, the outer peripheral contact portion 2120 has convex portions 2122 at each of four corners, and the convex portion 2122 is convex on the upper side of the surface of the base portion 2121, and the movable contact member 10 and Function as a substantial contact point (peripheral contact point).

  The connection portion 2302 extends in the X direction, and connects the outer peripheral contact portion 2120 and the second connection terminal 2402. In the present embodiment, as an example, the connection portion 2302 is connected in the vicinity of the center of each of the outer peripheral contact portion 2120 and the second connection terminal 2402 in the Y direction. The width in the Y direction of the connection portion 2302 is significantly smaller than the width in the Y direction of the outer peripheral contact portion 2120 or the width in the Y direction of the second connection terminal 2402. As shown in FIGS. 2 and 3, the connection portion 2302 is enclosed in the resin portion 30 in such a manner that substantially the entire portion is embedded in the resin portion 30.

  The second connection terminal 2402 is formed on the other side (left side in FIG. 2) in the X direction. The second connection terminal 2402 is exposed from the resin portion 30 in the X direction.

  The resin portion 30 forms a case (housing) of the switch device 1. The resin portion 30 is formed as a single-piece article with the fixed contact member 20 by injecting the resin into the mold using the fixed contact member 20 as an insert part. That is, the resin portion 30 and the fixed contact member 20 are an integrally molded article joined to each other. The resin portion 30 integrates the central contact forming member 211 and the outer peripheral contact forming member 212 while maintaining electrical insulation between the central contact forming member 211 and the outer peripheral contact forming member 212. Although resin portion 30 secures electrical insulation between central contact formation member 211 and outer peripheral contact formation member 212, as described above, central contact formation when movable contact member 10 is pushed downward. Electrical conduction between the member 211 and the peripheral contact forming member 212 is possible.

  The resin portion 30 is a fixed contact in such a manner that the first connection terminal 2401 and the second connection terminal 2402 are exposed on both sides in the X direction, and the central contact portion 2110 and the outer peripheral contact portion 2120 are exposed and project from the upper surface. It is joined to the member 20.

  The resin part 30 forms the concave-shaped accommodating part 70 in which the movable contact member 10 is accommodated, as shown in FIG. In the housing portion 70, the central contact portion 2110 and the outer peripheral contact portion 2120 are exposed and project from the upper surface (bottom surface of the housing portion 70).

  Moreover, the resin part 30 has the protrusion part 32 in the surface of the outer side, as shown in FIG. The protrusion 32 protrudes downward from the lower surface of the resin portion 30. The protrusion 32 has a form that fits into the positioning hole 51 (see FIG. 3) formed in the substrate 50. The protrusions 32 are preferably provided in two or more places. Thereby, the displacement in the rotational direction at the time of positioning is restricted, and the positioning accuracy is improved. Moreover, the protrusion part 32 has the hole 321 which makes the space in the accommodating part 70, and external space connect.

  The sealing member 40 is a film-like member, and as shown in FIG. 3, closes the housing portion 70 on the upper side of the resin portion 30. For example, the sealing member 40 is laser welded to the resin portion 30, but may be joined by other methods. The sealing member 40 seals the upper side of the housing portion 70. As a result, while the thinness of the switch device 1 is maintained, foreign matter does not enter the contact position between the central contact portion 2110 and the movable contact member 10 and the contact position between the outer peripheral contact portion 2120 and the movable contact member 10, and the electrical connection is more Stabilize. Incidentally, as shown in FIG. 1, the sealing member 40 may have a configuration in which the periphery slightly bulges upward around a portion where the projection 42 (see FIG. 3) is provided.

  By the way, in the process of manufacturing the electronic device, when the switch device 1 is mounted on the substrate 50, reflow soldering is performed. In the reflow soldering, the air in the storage unit 70 sealed by the sealing member 40 expands more than the volume of the storage unit 70. At that time, a part of the air which can not be accommodated in the accommodating portion 70 escapes from a slight gap existing between the fixed contact member 20 and the resin portion 30 to the outside. Thereafter, the air in the storage unit 70 is contracted by cooling, and at this time, the external air tries to intrude into the storage unit 70. Such expansion and contraction exerts a pump-like effect. Further, the gap between the fixed contact member 20 and the resin portion 30 is connected to the root portion where the connection terminal 24 to be actually soldered is exposed, and immediately after the reflow soldering is performed, the connection terminal 24 is formed. The flux remains in a fluid state. Therefore, when the airtightness of the accommodating portion 70 is high, the flux may be sucked into the accommodating portion 70 from the gap between the fixed contact member 20 and the resin portion 30, which may be one of the main causes of so-called fluxing.

  In this respect, according to the present embodiment, as described above, since the protrusion 32 is provided, and the protrusion 32 has the hole 321 for communicating the space in the storage portion 70 with the external space, Airtightness is reduced. Therefore, it is possible to reduce the flux rise due to the expansion and contraction of the air in the housing portion 70 accompanying the reflow soldering.

  Specifically, in the reflow soldering, the air in the housing portion 70 expands, and at this time, the air in the housing portion 70 can mainly go out through the holes 321 (see arrow R30 in FIG. 3). ). After that, when the air in the storage unit 70 cools and shrinks, the external air can return to the inside of the storage unit 70 through the hole 321 (see an arrow R31 in FIG. 3). This is because the hole 321 is significantly larger than the gap between the fixed contact member 20 and the resin portion 30, and air can easily pass therethrough. The hole 321 is opened at the lower end of the protrusion 32 as shown in FIG. Since soldering is performed on the upper surface of the substrate 50, there is little flux that can reach below the substrate 50 and little flux that can reach to the lower end of the protrusion 32. Therefore, when air is returned into the housing 70 through the holes 321, the flux is not substantially entrained (sucked). Thus, according to the present embodiment, it is possible to reduce the suction of the flux due to the expansion and contraction of the air in the housing portion 70 accompanying the reflow soldering. As a result, it is possible to reduce the inconvenience (for example, contact failure etc.) caused by the flux rising, that is, the flux reaching the upper surface of the fixed contact portions (the central contact portion 2110 and the outer peripheral contact portion 2120).

  As mentioned above, although each Example was explained in full detail, it is not limited to a specific example, A various deformation | transformation and change are possible within the range described in the claim. In addition, it is also possible to combine all or a plurality of the components of the above-described embodiment.

  For example, in the above-described embodiment, the holes 321 are formed linearly in the vertical direction, but may be formed in a labyrinth shape. For example, the hole 321 opens downward at the lower end of the projection 32, but may have an opening on the side of the projection 32.

  Further, in the embodiment described above, the hole 321 is formed in only one of the two protrusions 32. Specifically, the hole 321 is formed only in one of the two protrusions 32 which does not overlap the fixed contact member 20 in a top view. However, the holes 321 may be formed in both of the two protrusions 32. In this case, the two projecting portions 32 are set so as not to overlap the fixed contact member 20 in a top view so that the external space communicates with the space in the housing portion 70 via the both holes 321.

DESCRIPTION OF SYMBOLS 1 switch device 7 solder 10 movable contact member 20 fixed contact member 24 connection terminal 30 resin portion 32 projecting portion 40 sealing member 42 projection 50 substrate 51 positioning hole 70 accommodation portion 211 central contact forming member 212 outer peripheral contact forming member 321 hole 2110 central Contact portion 2111 Outer peripheral portion 2112 Convex portion 2120 Outer peripheral contact portion 2121 Base portion 2122 Convex portion 2300 Connection portion 2301 Tip portion 2302 Connection portion 2401 First connection terminal 2402 Second connection terminal

Claims (5)

A movable contact member,
A stationary contact member having a stationary contact portion cooperating with the movable contact member, and a connection terminal portion soldered to an external circuit;
A concave-shaped housing portion is formed which is joined to the fixed contact member and opened on one side in a first direction to receive the movable contact member, and the fixed contact portion is exposed in the housing portion and the outer surface And a resin portion having a projection on the other side surface that protrudes to the other side.
The projecting portion has a hole for communicating the space in the housing portion with the external space of the resin portion,
The switch device, wherein an opening position of the hole on the external space side is different from the position of the connection terminal portion in the first direction.   The switch device according to claim 1, wherein the protrusion has an opening associated with the hole at a tip end in a protruding direction.   The switch device according to claim 1, wherein the protrusion is configured to fit in a positioning hole formed in a substrate on which the switch device is mounted.   The switch device according to claim 3, wherein a plurality of the protrusions are provided.   5. The switch device according to claim 3, wherein the connection terminal portion is soldered on the surface on the side where the tip end portion of the protruding portion does not exist among the surfaces on both sides in the first direction in the substrate. .

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