JP7085965B2 - Switch module and switch device - Google Patents

Description

The present invention relates to a switch module and a switch device.

Conventionally, an insulating elastic body having a base portion and an invertable dome-shaped bulging portion formed so as to project from the base portion, and a contact portion provided on the lower surface side of the bulging portion can be soldered. The frame body is made of a metal material and includes a frame body attached to the base portion of the elastic body. It has a wall portion on which an inner wall surface is formed to regulate the lateral movement of the wall portion, and at least a part of the lower portion of the wall portion is used as a soldering portion at the time of surface mounting on a circuit board, and the base portion thereof. Is for a push button switch, wherein the bottom surface thereof is a mounting surface on the circuit board, and a space portion is provided between the base portion and the inner wall surface of the wall portion on the mounting surface side. There is a movable contact body (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2003-281966

By the way, there are cases where it is desired to attach the frame (housing) to the circuit board without soldering. For example, there is a method of fixing the housing to the circuit board with an adhesive or an adhesive sheet, but when the adhesive or the adhesive sheet softens and flows into the internal space surrounded by the housing and the circuit board, it is provided on the circuit board. There is a risk that it will adhere to the contact points, etc., leading to malfunction of the contact points.

Therefore, it is an object of the present invention to provide a switch module and a switch device that enable good operation in a configuration that does not use solder.

The switch module according to the embodiment of the present invention has a housing portion that penetrates between the first surface and the second surface in the thickness direction, and is attached to a housing fixed to a substrate having a fixed contact member and the storage portion. A movable contact member that is housed and detachable from the fixed contact member and a cover sheet that is fixed to the first surface of the housing are included, and the housing is formed so as to project from the second surface and is viewed in a plan view. It surrounds the storage portion with an elastic surrounding portion, and the surrounding portion is integrally molded with the housing .

It is possible to provide a switch module and a switch device that enable good operation in a configuration that does not use solder.

It is a perspective view which shows the switch device 100 of embodiment. It is an exploded view of the switch device 100. It is a perspective view which shows the back side of the switch device 100. It is a figure which shows the cross section of AA of FIG. It is a perspective view which shows the switch module 100A. It is a perspective view which shows the back side of the switch module 100A. It is a bottom view which shows the switch module 100A.

Hereinafter, an embodiment to which the switch module of the present invention and the switch device are applied will be described.

<Embodiment>
FIG. 1 is a perspective view showing the switch device 100 of the embodiment. FIG. 2 is an exploded view of the switch device 100. FIG. 3 is a perspective view showing the back side of the switch device 100. FIG. 4 is a diagram showing a cross section taken along the line AA of FIG. In FIG. 4, the switch module 100A and the wiring board 160 are shown separately. FIG. 5 is a perspective view showing the switch module 100A. FIG. 6 is a perspective view showing the back side of the switch module 100A.

In the following, it will be described using the XYZ coordinate system. In the following, for convenience of explanation, the negative Z-axis side is referred to as a lower side or a lower side, and the positive Z-axis side is referred to as an upper side or an upper side, but does not represent a universal hierarchical relationship. Further, the plane view means the XY plane view.

As shown in FIGS. 1 to 4, the switch device 100 includes a housing 110, a metal contact 120, a stem 130, an insulator 140, an adhesive sheet 150, and a wiring board 160. Of these, the housing 110, the metal contact 120, the stem 130, and the insulator 140 constitute the switch module 100A. The switch module 100A is a push button switch.

The housing 110 is made of resin and is a plate-shaped member (housing) having the same length in the X-axis direction and the Y-axis direction and having a thickness in the Z-axis direction. The upper surface of the housing 110 is an example of the first surface, and the lower surface is an example of the second surface.

The housing 110 has a storage portion 111 that penetrates in the thickness direction. The insulator 140 is adhered to the upper surface of the housing 110, and the wiring board 160 is fixed to the lower surface.

The metal contact 120 and a part of the stem 130 are stored in the storage portion 111. Since the position of the storage portion 111 in the plan view is aligned with the position of the fixed contact 161 arranged on the upper surface of the wiring board 160, the fixed contact 161 is also stored in the lower portion of the storage portion 111.

As shown in FIG. 4, the storage portion 111 has a leg storage portion 111A and a support portion 111B. The leg storage portion 111A extends from the inner peripheral portion of the storage portion 111 toward the four corners of the housing 110, and is a portion extending the storage portion 111. The leg storage portion 111A does not penetrate to the lower surface of the housing 110 and has a shape recessed from the upper surface side. In other words, the leg storage portion 111A has a bottom (a structure having a bottom). A support portion 111B is provided at the bottom of the leg storage portion 111A. The support portion 111B is a bottomed portion of the leg storage portion 111A. The leg storage portion 111A stores the leg portion 123 of the metal contact 120, and the tip of the leg portion 123 is supported by the support portion 111B. The leg storage portion 111A and the support portion 111B are examples of the holding guide portion.

Further, as shown in FIGS. 4 and 6, the housing 110 has a protrusion 112 and a surrounding portion 113 on the lower surface thereof.

The protrusion 112 is a columnar member that protrudes from the four corners of the housing 110 in the negative direction of the Z axis. The protrusion 112 is an elastic resin member, and is integrally molded with the housing 110 as an example.

Four protrusions 112 are provided, and each of the protrusions 112 is inserted into a through hole 162 of the wiring board 160. Since the inner diameter of the through hole 162 is smaller than the outer diameter of the protrusion 112, the protrusion 112 is inserted in a state of being press-fitted into the through hole 162 and crimped into the through hole 162. As shown in FIG. 3, the tip of the protrusion 112 protrudes from the lower surface of the wiring board 160, and the protruding portion is crimped. do. Therefore, in a state where the protrusion 112 is inserted into the through hole 162, press-fitted, and crimped, the tip of the protrusion 112 is thicker than the portion inside the through hole 162. In this way, when the tip of the protrusion 112 is inserted into the through hole 162 and crimped, the protrusion 112 does not have to be press-fitted into the through hole 162.

The housing 110 is adhered to the wiring board 160 via the adhesive sheet 150, and the protrusion 112 is press-fitted into the through hole 162 of the wiring board 160, and the tip is crimped to be fixed to the wiring board 160.

As shown in FIG. 6, the surrounding portion 113 is a ridge-shaped portion provided on the lower surface of the housing 110, and protrudes from the lower surface of the housing 110 in the negative direction of the Z axis. The surrounding portion 113 has a rectangular shape so as to pass through the outer side of the storage portion 111 (including the leg storage portion 111A) and the inner side of the protrusion 112 in XY plan view and to make one round around the storage portion 111. It is provided in. The surrounding portion 113 surrounds the storage portion 111 in an XY plan view. The surrounding portion 113 is an elastic resin member, and is integrally molded with the housing 110 as an example. When the surrounding portion 113 is integrally molded with the housing 110, the surrounding portion 113 may be formed into a member having a lower elastic modulus (easily deformed) than the housing 110 by two-color molding.

Since the surrounding portion 113 is located inside the opening 151 of the adhesive sheet 150 shown in FIG. 2, the housing 110 is adhered to the wiring board 160 via the adhesive sheet 150, and the protrusion 112 penetrates the wiring board 160. When it is press-fitted into the hole 162 and fixed to the wiring board 160, the surrounding portion 113 comes into contact with the upper surface of the wiring board 160 in a state of being crushed in the Z-axis direction.

Since the surrounding portion 113 is crushed in the Z-axis direction in this state, the space between the housing 110 and the wiring board 160 is sealed by the surrounding portion 113. The sealing by the surrounding portion 113 is at a level that satisfies a predetermined waterproof level. The surrounding portion 113 serves as a barrier portion for preventing the softened adhesive sheet 150 and other foreign substances from entering the space where the metal contact 120 and the fixed contact 161 are located.

The metal contact 120 is made of an elastic and conductive metal leaf spring and is arranged in the accommodating portion 111. Here, the metal contact 120 will be described with reference to FIG. 7. FIG. 7 is a bottom view showing the switch module 100A.

As shown in FIG. 2, the metal contact 120 is partitioned like a tongue piece by a dome portion 121 having a bulging shape, a leg portion 123 supporting the dome portion 121, and an opening 122 near the top of the dome portion 121. It has a contact portion 125 bent from the bent portion 124. As shown in FIG. 2, the contact piece portion 125 having a cantilevered tongue piece-like outer shape is provided with a convex portion 125A on the tip end side thereof.

The dome portion 121 has a dome-shaped shape that bulges in the positive direction of the Z-axis in FIG. 2, and has a circular shape in an XY plan view. The dome portion 121 has a shape capable of reversing operation in which the bulging direction is reversed by a pressing operation from the bulging direction (Z-axis positive direction). Further, it has elasticity to return to the original bulging direction when released from this pressing.

Four legs 123 are formed so as to extend outward from the outer peripheral end of the dome portion 121. The leg portion 123 extends outwardly and in the negative direction of the Z axis from the outer peripheral end portion of the dome portion 121, and is bent so as to extend outwardly and in the positive direction of the Z axis at the bent portion 123A. Therefore, the bent portion 123A protrudes from the dome portion 121 in the pressing direction (Z-axis negative direction) of the metal contact 120.

The bent portions 123A of the four leg portions 123 are arranged so as to abut on the four peripheral fixed contacts 161B, respectively. Therefore, the bent portion 123A is not stored inside the leg storage portion 111A, and the portion of the leg portion 123 that is ahead of the bent portion 123A is stored inside the leg storage portion 111A. The tip of the leg portion 123 is supported by the support portion 111B. The bent portion 123A is an example of the contact portion.

By supporting the tip of the leg portion 123 by the support portion 111B in this way, the metal contact 120 is stably held inside the storage portion 111.

When the housing 110 is fixed to the wiring board 160, the bent portions 123A each come into contact with the four peripheral fixed contacts 161B, so that the tips of the leg portions 123 may be separated from the support portion 111B. ..

The leg portion 123 supports the outer peripheral end portion of the dome portion 121 when the dome portion 121 is inverted by the pressing operation, and has an elastic force capable of bending after the dome portion 121 is inverted. As will be described later, the leg portion 123 has a length (height) that allows the convex portion 125A of the contact piece portion 125 to come into contact with the central fixed contact 161A when the dome portion 121 reverses. ..

As shown in FIG. 7, when the metal contact 120 is viewed in a plan view from the top side of the dome portion 121, the contact piece portion 125 is arranged in the circular region CR centered on the virtual apex 126 of the dome portion 121. It is divided into tongue pieces by an opening 122. Then, the contact portion 125 is bent in the negative direction of the Z axis from the bent portion 124 on the root side of the contact portion 125, protrudes toward the inside of the dome portion 121, and is a circular region of the dome portion 121 other than the contact portion 125. The CR is processed into an almost flat surface. The bent portion 124 is provided with two convex portions 124A.

Both the convex portion 125A provided on the contact piece portion 125 and the convex portion 124A provided in the circular region CR are formed in a hemispherical shape protruding in the negative direction of the Z axis. The shape of the metal contact 120 as described above can be formed by a combination of punching and pressing of a metal plate using a die and bending.

The metal contact 120 is arranged in the storage portion 111 of the housing 110, and the stem 130 is arranged so as to be in contact with the top side of the dome portion 121. In the initial state in which the protruding portion 141 of the insulator 140 is not pressed, the dome portion 121 and the contact portion 125 are separated from the central fixed contact 161A. In the metal contact 120, the four legs 123 are in contact with the four peripheral fixed contacts 161B, respectively, and an electrically conductive state with the peripheral fixed contacts 161B is obtained.

When the protruding portion 141 is pressed and the dome portion 121 is in an inverted state, the contact portion 125 moves in the negative direction of the Z axis, and the convex portion 125A provided in a convex shape toward the central fixed contact 161A side is fixed in the center. It comes into contact with the contact 161A. The contact piece portion 125 is set so that the elastic force of the dome portion 121 is smaller than the elastic force of the reversing operation, so that the contact piece portion 125 is easily bent. Therefore, in the contact piece portion 125, the convex portion 125A abuts on the central fixed contact 161A, and the tip end side is slightly elastically deformed with the bent portion 124 as a fulcrum to maintain stable contact. Since the contact portion is the convex portion 125A, electrically stable contact can be obtained.

Further, at the maximum operation amount when the protruding portion 141 is pressed, the entire dome portion 121 in the inverted state approaches the central fixed contact 161A due to the bending of the leg portion 123 and the contact portion 125, and toward the central fixed contact 161A side. The convex portion 124A provided in a convex shape comes into contact with the central fixed contact 161A. From this state, the elastic deformation is less likely to occur, so that the operating load felt by the operator increases sharply. At this time, as described above, the metal contact 120 and the central fixed contact 161A are already electrically connected, and the electrical contact / detachment state does not change even if the convex portion 124A comes into contact with the metal contact 120. Since the convex portion 125A and the two convex portions 124A abut on the central fixed contact 161A, the contact state between the metal contact 120 and the central fixed contact 161A becomes more stable.

Further, by abutting the central fixed contact 161A at three points of the convex portion 125A and the two convex portions 124A, the contact piece portion 125 is bent in the direction opposite to the protruding direction even when pressed by an excessive force. It also has the effect of prolonging the operating life because it is difficult to apply a large force.

When the pressing operation of the protrusion 141 is released, the elastic force of the metal contact 120 returns to the initial state.

As shown in FIGS. 2 and 4, the stem 130 has a columnar portion 131 and a flange portion 132. The stem 130 is made of resin as an example, and is an example of a pressing member. The columnar portion 131 is the base of the stem 130 and has a columnar shape. As an example, the columnar portion 131 has a larger diameter (thicker) in the upper portion (upper part) 131A than in the lower portion (lower part) 131B than in the flange portion 132.

Since the protruding portion 141 of the insulator 140 is pushed by a finger or the like on the upper 131A, a thicker one can be surely pushed at the time of pressing, and the lower 131B presses the center of the dome portion 121 of the metal contact 120 to some extent. This is because the thinner the dome portion 121, the easier it is to press the center of the dome portion 121 and invert it.

The flange portion 132 is a disk-shaped protruding portion that protrudes radially outward from the side surface of the columnar portion 131. The height of the flange portion 132 is substantially intermediate between the upper end and the lower end of the columnar portion 131. The diameter of the flange portion 132 is adjusted to the inner diameter of the storage portion 111. That is, the shape and size of the stem 130 in a plan view are substantially the same as the shape and size of the portion of the storage portion 111 excluding the leg storage portion 111A. This is to suppress the runout of the stem 130 due to the vertical movement. Note that FIG. 4 is a cross section including the leg storage portion 111A.

By disposing such a stem 130 between the metal contact 120 and the insulator 140, and pressing the metal contact 120 via the stem 130 when the protruding portion 141 of the insulator 140 is pressed, the metal contact 120 is pressed. Even if the switch module 100A is miniaturized and the metal contact 120 is miniaturized, the center of the metal contact 120 can be reliably pressed.

Further, when the switch module 100A is miniaturized, the bonding area between the housing 110 and the insulator 140 becomes smaller. In such a case, when the switch module 100A is exposed to a high temperature at the time of mounting or the like and the temperature of the space inside the storage unit 111 whose upper and lower parts are sealed by the insulator 140 and the wiring board 160 rises, the thermal expansion of the air causes the switch module 100A to rise. The insulator 140 may come off from the housing 110.

However, by providing the stem 130, the amount of air in the internal space can be reduced, and by having the stem 130 having a flange, the amount of air in the internal space can be further reduced. The peeling of 140 can be suppressed.

The insulator 140 is made of a resin sheet and is adhered to the upper surface of the housing 110 to seal the storage portion 111. In this way, the insulator 140 is fixed to the upper surface of the housing 110. The seal between the housing 110 and the insulator 140 is at a level that meets a predetermined waterproof level. The insulator 140 may be transparent. The insulator 140 is an example of a cover sheet.

The insulator 140 has a protrusion 141 at a position overlapping the upper portion 131A of the stem 130 in a plan view (see FIGS. 1, 2, 4, and 5). The protrusion 141 is formed by heat-processing the resin sheet.

The insulator 140 is adhered to the housing 110 in a state where the metal contact 120 and the stem 130 are housed in the storage portion 111 of the housing 110. By adhering the insulator 140 to the housing 110, the metal contact 120 and the stem 130 are held in the accommodating portion 111 so as not to rattle.

The protruding portion 141 is arranged at a position overlapping the upper surface of the upper portion 131A of the columnar portion 131 of the stem 130 in a plan view, and is in contact with the upper surface of the upper portion 131A of the columnar portion 131. The protruding portion 141 can be flexed and deformed in the negative direction of the Z axis by being pressed in the negative direction of the Z axis, and is in contact with the upper surface of the columnar portion 131 in a state where the projecting portion 141 is not flexed and deformed as shown in FIG. ..

The adhesive sheet 150 is a sheet-like member that adheres the wiring board 160 to the lower surface of the housing 110. The adhesive sheet 150 is an example of an adhesive portion. As shown in FIG. 2, the adhesive sheet 150 has an opening 151 corresponding to the storage portion 111 and the surrounding portion 113, and a notch portion 152 corresponding to the four protrusions 112 and the through hole 162. The opening 151 is located outside the surrounding portion 113 in a plan view. The adhesive sheet 150 adheres between the lower surface of the housing 110 and the wiring board 160. The housing 110 is fixed to the wiring board 160 by press-fitting the protrusion 112 into the through hole 162 of the wiring board 160, but can be more stably fixed by using the adhesive sheet 150.

A fixed contact 161 is mounted on the upper surface of the wiring board 160. The fixed contact 161 is provided at a position corresponding to the storage portion 111 in a plan view, and has one central fixed contact 161A and four peripheral fixed contacts 161B. The four peripheral fixed contacts 161B are respectively arranged at positions corresponding to the bent portions 123A of the four leg portions 123 of the metal contact 120.

In a state where the protrusion 141 of the insulator 140 is not pressed, the bent portions 123A of the four legs 123 of the metal contact 120 each contact the four peripheral fixed contacts 161B and are electrically connected to each other. There is.

When the protruding portion 141 of the insulator 140 is pressed to the lowermost portion (position of the full stroke) in the Z-axis direction, the dome portion 121 of the metal contact 120 reverses and contacts the central fixed contact 161A, and the central fixed contact 161A and the central fixed contact 161A. The four peripheral fixed contacts 161B are electrically connected by the metal contact 120 which has been inverted.

As described above, in the switch module 100A and the switch device 100, the housing 110 is adhered to the wiring board 160 via the adhesive sheet 150, and the protrusion 112 is press-fitted into the through hole 162 of the wiring board 160 for wiring. When fixed to the substrate 160, the surrounding portion 113 abuts on the upper surface of the wiring board 160 in a state of being crushed in the Z-axis direction, so that the space between the housing 110 and the wiring board 160 is sealed by the surrounding portion 113. Ru.

Therefore, since the internal space where the metal contact 120 and the fixed contact 161 are present is sealed by the surrounding portion 113, the softened adhesive sheet 150 and other foreign matters are prevented from adhering to the metal contact 120 and the fixed contact 161. It can be suppressed, and the occurrence of malfunction of the switch module 100A and the switch device 100 can be suppressed.

Therefore, it is possible to provide a switch module 100A and a switch device 100 that enable good operation in a configuration that does not use solder.

Further, the shape and size of the stem 130 in a plan view are matched with the shape and size of the storage portion 111, but since the storage portion 111 has the leg storage portion 111A, when the stem 130 moves up and down, the stem 130 has a leg storage portion 111A. The air in the internal space of the storage portion 111 mainly passes through the leg storage portion 111A and can move back and forth between the space above the flange portion 132 and the space below the flange portion 132.

Therefore, the stem 130 can be smoothly moved up and down, and the switch module 100A and the switch device 100 having good operation can be provided.

Although the form in which the adhesive sheet 150 is used has been described above, the same applies to the case where an adhesive, an adhesive, or an adhesive sheet is used.

Further, although the embodiment in which the surrounding portion 113 is integrally molded with the housing 110 has been described above, the surrounding portion 113 may be a separate member from the housing 110 and may be arranged so as to be aligned with the housing 110. Further, as long as it does not cause contact failure of the metal contact 120 or the fixed contact 161 even if it is softened, it may be a double-sided tape.

Further, in the above description, the form in which the housing 110 has the protrusion 112 and the protrusion 112 is press-fitted into the through hole 162 of the wiring board 160 has been described, but the housing 110 does not have the protrusion 112 and the wiring board 160. May have a configuration that does not have a through hole 162. In this case, the housing 110 and the wiring board 160 may be firmly fixed by increasing the adhesive force of the adhesive sheet 150 or the like.

Further, in the above, the form in which the opening 122, the bending portion 124, the contact piece portion 125 and the like are provided in the dome portion 121 of the metal contact 120 has been described, but the dome portion 121 has the opening 122, the bending portion 124, and the like. It may be a hemispherical and dome-shaped member that does not include the contact portion 125 and the like, and may be configured such that the top portion abuts on the lower surface of the lower portion 131B of the stem 130.

Further, in the above, the form in which the metal contact 120 has four legs 123 has been described, but the leg 123 of the metal contact 120 only needs to be able to support the metal contact 120 with respect to the housing 110. Not limited.

Although the switch module and the switch device according to the exemplary embodiment of the present invention have been described above, the present invention is not limited to the specifically disclosed embodiments and is within the scope of claims. Various modifications and changes are possible without deviation.

100 Switch device 100A Switch module 110 Housing 111 Storage 111A Leg storage 111B Support 120 Metal contact 121 Dome 123 Leg 130 Stem 131 Columnar 132 Flange 140 Insulator 161 Fixed contact 161A Central fixed contact 161B Peripheral fixed contact

Claims (9)

A housing that has a housing portion that penetrates between the first and second surfaces in the thickness direction and is fixed to a substrate having a fixed contact member.
A movable contact member that is stored in the storage unit and can be contacted and separated from the fixed contact member,
A cover sheet fixed to the first surface of the housing and
Including
The housing is formed so as to project from the second surface, surrounds the storage portion in a plan view, and has an elastic surrounding portion.
The surrounding portion is a switch module integrally molded with the housing . The switch module according to claim 1 , wherein the housing has a columnar protrusion that protrudes from the second surface and is inserted and fixed in a through hole of the substrate. The switch module according to claim 2 , wherein the portion protruding from the through hole on the tip end side of the protrusion is thicker than the portion of the protrusion located inside the through hole. The switch module according to any one of claims 1 to 3 , wherein the housing is fixed to the substrate by an adhesive portion arranged on the second surface so as to surround the surrounding portion in a plan view. The movable contact member is a metal leaf spring having a dome portion formed in a dome shape and capable of reversing operation, and a leg portion extending outward from the outer peripheral end portion of the dome portion in a band shape.
The switch module according to any one of claims 1 to 4 , wherein the housing is continuously formed in the storage portion, and has a bottomed holding guide portion capable of storing the legs. The leg portion has an abutting portion protruding in the pressing direction of the dome portion.
The switch module according to claim 5 , wherein the contact portion protrudes from the dome portion in the pressing direction. It has a columnar main body portion arranged between the movable contact member and the cover sheet, and a flange portion that protrudes from the side surface of the main body portion over the entire circumference and has a shape that follows the shape of the inner wall of the storage portion. Including a pressing member,
The switch module according to claim 5 or 6 , wherein the main body portion is arranged so as to be aligned with the top portion of the dome portion in a plan view. The switch module according to claim 7 , wherein the main body portion is thicker in the first portion on the cover sheet side than in the flange portion, and in the second portion on the movable contact member side than in the flange portion. The switch module according to any one of claims 1 to 8 .
A switch device including a substrate having the fixed contact member.

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