JP6735437B2 - switch - Google Patents

Description

The present invention relates to a switch used for an input operation unit of various electronic devices.

In recent years, various electronic devices have been continuously reduced in size, thickness and weight, and there is a strong demand for a switch used in an input operation unit thereof to be small and thin.

Such a conventional switch will be described with reference to the drawings.

FIG. 5 is a cross-sectional view showing an arrangement state of a conventional switch on a wiring board, FIG. 6 is a top view thereof, FIG. 7 is a front view thereof, and FIG. 8 is a bottom view of a conventional switch. It should be noted that the drawings are shown in an easy-to-see state without showing the solder.

The conventional switch is configured as a so-called push switch having a switch contact portion inside a resin case 1.

As shown in FIGS. 5 and 6, the case 1 is formed in a rectangular shape in a top view having a concave portion that is open at the top. As shown by the dotted line in FIG. 6, the opening of the recess is formed in an oval shape in a top view, and the switch contact portion is formed in this recess.

As shown in FIG. 5, the switch contact portion includes a first fixed contact 10, a second fixed contact 20, and a movable contact 30. That is, the first fixed contact 10 is arranged at the center position of the bottom surface of the recess of the case 1, and the second fixed contact 20 is arranged at the outer peripheral position of the bottom surface of the recess. The movable contact 30, which is formed in the shape of an upward convex dome, is disposed in the recess with the outer peripheral lower end abutting on the second fixed contact 20. The lower central surface of the movable contact 30 faces the first fixed contact 10 with a space.

Then, in the case 1, the two first terminals 15 are led out from the lower end on one side in the longitudinal direction, and the two second terminals 26 are led out from the lower end on the other side in the longitudinal direction. The two first terminals 15 are connected to the first fixed contact 10 and the two second terminals 26 are connected to the second fixed contact 20.

A protective sheet 40 is attached to the upper end surface of the side wall of the case 1, and the concave portion is covered with the protective sheet 40 to form a conventional switch.

Here, the bottom surface shape of the bottom of the case 1 and the lead-out locations of the first terminal 15 and the second terminal 26 will be described with reference to FIGS. 7 and 8.

As shown in FIGS. 7 and 8, the bottom surface of the bottom of the case 1 has a first flat surface portion 3 formed in a substantially rectangular and flat surface at a central position, and on both sides in the longitudinal direction with respect to the first flat surface portion 3. The second flat surface portion 5 is provided adjacent to each other and has a second flat surface portion 5 formed on a flat surface at a position slightly higher than the first flat surface portion 3. That is, the lower surface of the case 1 is configured such that one second flat surface portion 5, the first flat surface portion 3, and the other second flat surface portion 5 are arranged in this order from right to left in the longitudinal direction, and the height position thereof is , There is a step at the boundary of each other. The second flat surface portion 5 on one side and the second flat surface portion 5 on the other side are set at the same height position.

The two first terminals 15 are derived from the one second flat surface portion 5, and the two second terminals 26 are derived from the other second flat surface portion 5. Here, each of the first terminal 15 and the second terminal 26 has an exposed portion (see FIGS. 6 and 8) exposed at the same height as the corresponding second flat surface portion 5, and the height thereof It projects horizontally outward at the position. This exposed portion is provided to secure a soldering area according to the downsizing of the switch.

The switch is mounted by soldering the first terminal 15 and the second terminal 26 to the land portions 52 and 54 provided on the wiring board 50. That is, at the time of mounting, cream solder is applied to the respective land portions 52 and 54, and the switch is arranged on the wiring board 50 so that the corresponding first terminal 15 and second terminal 26 are located thereon. .. After that, the first terminal 15 and the second terminal 26 are soldered and fixed to the lands 52 and 54 through the reflow process and surface-mounted.

In the mounted state, in the switch, since the second plane portion 5 leading out the first terminal 15 and the second terminal 26 is set at a position higher than the first plane portion 3, the difference in height is The height dimension of the solder is absorbed so that the first flat surface portion 3 of the case 1 can be mounted in a state of abutting on or near the wiring board 50. As a result, the switch can be mounted in such a state that the pressing force can be received by the wiring board 50 even if an excessive pressing force is applied during the pressing operation to the switch contact portion.

As the size of the switch becomes smaller, the distance between the first terminals 15 and the distance between the second terminals 26 become smaller, and the lands 52, 54 are usually formed in a rectangular shape. The boundary between the second flat surface portion 5 and the first flat surface portion 3 on one side and the boundary between the second flat surface portion 5 and the first flat surface portion 3 on the other side are both the first terminal 15 and the second terminal 26. It was unavoidable to configure it to have a linear step portion orthogonal to each protruding direction.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP 2004-171789 A

However, in the conventional switch, at the time of reflow, for example, the direction along the longitudinal direction of the case 1, that is, one of the second flat surface portions 5, the first flat surface portion 3, and the other second flat surface portion 5 are arranged in this order. When the cream solder is poured into the reflow furnace, the melting timing of the cream solder on each second flat surface portion 5 may be shifted.

For example, when the cream solder on one of the second flat surface portions 5 is melted first, the corresponding first terminals 15 are attracted downward by the melted solder, and a rotating force is applied to the switch itself. That is, a phenomenon occurs in which the switch itself tilts in the longitudinal direction with the linear step portion between the one second plane portion 5 and the first plane portion 3 as a fulcrum, and the other second plane portion 5 side The floating of the second terminal 26 may occur.

The present invention solves such a conventional problem, and an object of the present invention is to provide a switch capable of reducing tilted mounting during reflow soldering.

To accomplish the above object, as a case, the lower surface of the bottom, and a first spur surface, provided to be set next to each other the first flat surface by remote high position on the first flat surface, the terminal and a second flat surface in which at least one of the inner is derived, on the second flat section, constitutes a switch using the one provided with protrusion protruding downward.

If this time to the reflow soldering to the wiring board, the protrusion pins cream solder on the second flat surface corresponding to melt even occur a phenomenon that attracted downward, provided on the second flat surface Has an effect that the rotating force applied to the switch itself by contacting with the wiring board can be restricted, and the switch can be prevented from being mounted in an inclined manner.

According to the present invention, it is possible to obtain an advantageous effect that it is possible to obtain a switch that can be mounted with reduced inclination during reflow soldering.

Sectional drawing which shows the arrangement|positioning state on the wiring board of the switch by embodiment of this invention. Same front view Bottom view of a switch according to an embodiment of the present invention Bottom view of a switch with the same configuration Sectional drawing which shows the arrangement state of the conventional switch on the wiring board. Same top view Same front view Bottom view of conventional switch

Hereinafter, embodiments of the present invention will be described with reference to FIGS. It should be noted that the same components as those of the related art are denoted by the same reference numerals and detailed description thereof will be omitted.

(Embodiment)
FIG. 1 is a cross-sectional view showing an arrangement state of a switch on a wiring board according to an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a bottom view of a switch according to an embodiment of the present invention, and FIG. 4 is a modification thereof. It is a bottom view of a switch having a configuration. It should be noted that the drawings are shown in an easy-to-see state without showing the solder.

The switch according to the embodiment is configured as a so-called push switch in which a switch contact portion is provided in a resin case 61 as in the conventional case.

The case 61 has a rectangular shape in a top view and has a concave portion having an upper opening, and a switch contact portion is formed in the concave portion. The opening of the recess is formed in an oval shape in top view as in the conventional case.

The switch contact portion is composed of a first fixed contact 10, a second fixed contact 20, and a movable contact 30, similar to the conventional one. That is, the first fixed contact 10 is arranged at the center position of the bottom surface of the recess of the case 61, and the second fixed contact 20 is arranged at the outer peripheral position of the bottom surface of the recess. The movable contact 30, which is formed in the shape of an upward convex dome, is disposed in the recess with the outer peripheral lower end abutting on the second fixed contact 20. The lower central surface of the movable contact 30 faces the first fixed contact 10 with a space.

The two first terminals 15 connected to the first fixed contact 10 are led out from the lower end of one end of the case 61 on one side in the longitudinal direction. Two second terminals 26 connected to the second fixed contact 20 are led out from the lower end of the other end of the case 61 in the longitudinal direction.

A protective sheet 40 is attached to the upper end surface of the side wall of the case 61, and the concave portion is covered with the protective sheet 40.

Here, in the switch according to the embodiment, the bottom surface configuration of the bottom of the case 61 is different from that of the conventional product, thereby reducing the mounting in a tilted state when mounting on the wiring board, The explanation will be given below.

As shown in FIG. 1 and FIG. 3, the bottom surface of the bottom of the case 61 has a first flat surface portion 63 at a central position formed in a substantially rectangular flat surface, and a longitudinal direction with respect to the first flat surface portion 63. As in the conventional case, the second flat surface portion 65 is provided adjacent to each other on both sides and has a flat surface formed at a position slightly higher than the first flat surface portion 63.

That is, as in the conventional case, the lower surface of the case 61 is formed by arranging one second flat surface portion 65, the first flat surface portion 63, and the other second flat surface portion 65 in this order from right to left in the longitudinal direction. The position of the boundary between each of the two second plane portions 65 set at the height position and the first plane portion 63 has a linear step portion.

Then, the two first terminals 15 are derived from the one second flat surface portion 65, the two second terminals 26 are derived from the other second flat surface portion 65, and the respective first terminals 15 and The 2 terminal 26 has an exposed portion (see FIG. 3) that is exposed at the same height as the corresponding second flat surface portion 65, and the point that it horizontally projects outward at that height position is the same as in the conventional case. It is the same as the one. The first terminal 15 and the second terminal 26 can be soldered to each other, including the exposed portions described above.

Here, according to the embodiment, it is a conventional point that, for each second flat surface portion 65 of the case 61, two protruding portions 71 each having a circular horizontal section and protruding downward are integrally provided in the case 61. Different from the one.

Each of the protrusions 71 has a spherical tip, and the height of the tip is at the same height as the first plane portion 63 of the case 61 or at a position slightly higher than that, that is, above the first plane portion 63. The height is set so that it does not protrude.

The protrusions 71 are installed at the four corners near the outer edge of the case 61 one by one. That is, as shown in FIG. 3, each projecting portion 71 has two land portions 52 corresponding to the two first terminals 15 and two land portions corresponding to the two second terminals 26, which are shown by dotted lines. It is arranged at an outer position on the shorter side with respect to 54. Furthermore, each protrusion 71 is set and provided at a position adjacent to the exposed portion of each of the first terminal 15 and the second terminal 26 from the second flat surface portion 65.

In other words, the four protruding portions 71 are in a positional relationship such that the two projecting portions 71 are symmetrical with respect to the longitudinal direction of the case 61 when viewed from the center position of the switch, and the two projecting portions 71 are also symmetrical with respect to the lateral direction. It is established in a relationship. The two first terminals 15 are led out from the position between the two protruding portions 71 provided on the one second flat surface portion 65. The two second terminals 26 are led out from a position between the two protruding portions 71 provided on the other second flat surface portion 65.

The location of the protruding portion 71 is not particularly limited, but it is desirable to install the protruding portion 71 in the vicinity of the outer edge portion of the case 61, and it is particularly preferable to have the four corners of the case 61 because the area can be easily installed.

The switch according to this embodiment is configured as described above. In the operation, when the central position of the movable contact 30 is pressed downward via the protective sheet 40, the movable contact 30 is reversed. Thereby, the lower surface of the movable contact 30 comes into contact with the first fixed contact 10, the switch contact portion is turned on, and the first terminal 15 and the second terminal 26 are electrically connected. When the operation is released, the movable contact 30 returns to the original upward convex dome shape by its own restoring force, and returns to the OFF state of the switch contact portion shown in FIG.

Then, the switch according to the embodiment is surface-mounted by soldering the first terminal 15 and the second terminal 26 to the land portions 52 and 54 provided on the wiring board 50 in the same manner as in the past.

At the time of mounting, cream solder is applied to each land portion 52, 54, and the switch is arranged on the wiring board 50 so that the corresponding first terminal 15 and second terminal 26 are located thereon, and the reflow soldering is performed. Through the steps, the first terminal 15 and the second terminal 26 are soldered and fixed to the land portions 52 and 54 to be mounted.

Here, when the switch according to the embodiment is arranged on the wiring board 50 in which the land portions 52 and 54 are coated with cream solder, the first flat surface portion 63 of the case 61 and the respective second flat surface portions 65 are provided. The tip of the protruding portion 71 provided at is close to or in contact with the upper surface of the wiring board 50.

Then, even if the melting timing of the cream solder is deviated in each second flat surface portion 65 by flowing into the reflow furnace, the switch according to the embodiment causes the switch itself to tilt in the longitudinal direction side as compared with the conventional product. Is reduced.

In other words, for example, when the cream solder on the second flat surface portion 65 side on one side is melted first, the melted solder pulls the corresponding first terminals 15 downward, so that the first terminal 15 side is lowered. When the case 61 is slightly tilted, the tips of the two protruding portions 71 provided on the side of the second flat surface portion 65 on one side of the case 61 first come into contact with the wiring board 50.

The positions where the tips of the two protrusions 71 abut on the wiring board 50 are set so as to be in the vicinity of the first terminals 15, so that the distance by which the first terminals 15 are lowered is smaller than that of the conventional product. Can be kept smaller than As a result, the rotational force applied to the switch itself so as to tilt in the longitudinal direction can be regulated, and the tilt of the switch itself can be reduced.

It should be noted that there is a concern that the switch itself may tilt toward the lateral direction side of the case 61 depending on the molten state of the solder of the land portions 52 and 54, the shape setting of the first plane portion 63, and the like. If the protrusions 71 are provided corresponding to the four corners near the outer edge of the case 61 one by one like the switch according to (1), the inclination of the switch itself to the lateral direction side is also suppressed. Like

As described above, the switch according to the present embodiment has the configuration in which the two protruding portions 71 are provided in the vicinity of the first terminal 15 in the second flat surface portion 65 on one side. By melting the cream solder first, even if the first terminals 15 are attracted downward, it is possible to reduce the phenomenon in which the switch itself tilts in the longitudinal direction. For this reason, when the reflow soldering is performed, it is possible to reduce the possibility that the switch is mounted at an inclination as compared with the conventional one, and it is possible to provide a switch that enables stable reflow mounting.

The cross-sectional shape and the tip shape of the protruding portion 71 are not particularly limited. For example, the horizontal section may have a rectangular shape, a polygonal shape, or the like, or the tip may have a shape other than a spherical shape.

Further, the installation position and the number of the protruding portions 71 are not limited to those provided one at each of the four corners of the lower surface of the case 61.

For example, in addition to the above-mentioned protrusion 71, the protrusions are also provided between the first terminals 15 of the one second flat surface portion 65 and between the second terminals 26 of the other second flat surface portion 65. It is also possible to provide 71 one by one. Alternatively, the protrusions 71 may be provided one by one between the first terminals 15 and only between the second terminals 26.

It is preferable that the tip of the protruding portion 71 does not protrude more than the first flat surface portion 63. This is because, in consideration of the operating state of the switch, it is preferable that the first plane portion 63, which is directly below the operated position, be in the mounted state received by the wiring board 50.

The present invention has an object to reduce the mounting of the switch itself in a tilted state at the time of reflow soldering, and the configuration in which the protruding portion 71 is provided has been described above as a structural example. Other than 71, it is also possible to adopt a configuration in which an equivalent action is obtained.

An example of such a modification is that shown in FIG. The structure shown in FIG. 4 is configured by using a case 61A instead of using the case 61 provided with the above-mentioned protruding portion 71.

The lower surface of the bottom of the case 61A is not provided with the protruding portion 71, and instead, the extended portion 63A is integrally provided on the first plane portion 63.

The extended portion 63A of the first flat surface portion 63 has a narrow linear shape and protrudes from the first flat surface portion 63 toward each second flat surface portion 65 along each of the opposite outer edges on the short side of the case 61A. It is formed to have a shape. The height position of the extended portion 63A is the same as that of the first flat surface portion 63 or a position slightly higher than that, that is, the height position of the extended portion 63A is higher than that of the first flat surface portion 63. The height should be set so that there is no height. The amount of protrusion of the extended portion 63A onto the second flat surface portion 65 is preferably set such that the end position on the protruding side is as close to the first terminal 15 and the second terminal 26 as possible.

Even with the configuration of this modified example, since the extended portion 63A acts in the same manner as the protruding portion 71 described above, it is possible to reduce the phenomenon in which the switch itself tilts in the longitudinal direction during reflow soldering. Note that the extension 63A may be provided between the first terminals 15 or between the second terminals 26, as in the case of the protrusion 71.

In the above description, the shape settings such as the outer shapes of the cases 61 and 61A are not particularly limited. Further, the lead-out positions and the numbers of the first terminals 15 and the second terminals 26, the configuration of the switch contact portion, and the like are not particularly limited.

The switch according to the present invention can be provided as one that can be mounted with being tilted at the time of reflow soldering, and is mainly useful for an input operation unit of various electronic devices.

10 1st fixed contact 15 1st terminal 20 2nd fixed contact 26 2nd terminal 30 Movable contact 40 Protective sheet 50 Wiring board 52, 54 Land part 61, 61A Case 63 1st plane part 63A Extended part 65 2nd plane part 71 Projection

Claims (16)

A case having a concave portion including a side surface and opening in a first direction, a sidewall including an annular end surface connected to the side surface, and a bottom portion located in a second direction opposite to the concave portion in the first direction. ,
A first terminal led out from the case in a third direction orthogonal to the first direction;
A second terminal led out from the case in a fourth direction opposite to the third direction;
Equipped with
The bottom is
A first plane located in the second direction with respect to the recess so as to overlap the recess;
A second plane located on the than the first flat surface located in the first direction, the third direction than the first flat surface,
A third plane located on the than the first flat surface located in the first direction, the first flat the fourth direction than surface,
A first protrusion that protrudes from the second plane in the second direction;
A second projecting portion projecting from the third plane in the second direction;
Have
The second plane and the third plane are located in the second direction with respect to the end face so as to overlap with the end face,
Tip and the tip of the second protrusion of the first protrusion or the same position as the first flat surface, located in the first direction than the first flat surface,
switch. The first protruding portion has a first protruding portion and a second protruding portion,
The first terminal passes through a position between the first protruding portion and the second protruding portion,
The tip of each of said second projecting portion and the first projecting portion, the laid first plane and the same position, located in the second direction than the first plane,
The switch according to claim 1. The first protruding portion faces the second protruding portion with at least the first terminal interposed therebetween,
The switch according to claim 2. The second projecting portion has a third projecting portion and a fourth projecting portion,
The second terminal passes through a position between the third protruding portion and the fourth protruding portion,
Said third each of the tips of the projecting portion and the fourth projecting portion of said located first plane and the same position, located in the second direction than the first plane,
The switch according to claim 1. The third protruding portion faces at least the fourth protruding portion with at least the second terminal interposed therebetween,
The switch according to claim 4. The case has a rectangular shape when the case is viewed from the end face side,
The first projecting portion, the second projecting portion, the third projecting portion, and the fourth projecting portion are provided so as to correspond to the four corners of the case. The switch described. The first projecting portion, the second projecting portion, the third projecting portion, and the fourth projecting portion are provided near an outer edge portion of the case. The switch described. The case has a rectangular shape when the case is viewed from the end face side,
The first protruding portion, the second protruding portion, the third protruding portion and the fourth protruding portion are symmetrical with respect to the longitudinal direction of the case and the lateral direction of the case. The switch according to claim 4, which is provided. 5. Each of the first protruding portion, the second protruding portion, the third protruding portion, and the fourth protruding portion has a circular cross section in a plane along the first plane. 9. The switch according to claim 8. The first of said projecting portion and said second projecting portion third each of the tip of the projecting portion and the fourth projecting portion of the switch of claim 9 according to claims 4 is spherical. The first protrusion and the second protrusion are connected to the first plane,
The switch according to claim 1. The second projecting portion has a third projecting portion that faces the first projecting portion with the first plane interposed therebetween,
A front end of the third projecting portion, the laid first flat surface and the same position, located in the first flat surface by remote said first direction,
The switch according to claim 2. The switch according to claim 1, wherein each of the second plane and the third plane is a plane parallel to the first plane. The case includes a resin,
The first terminal is exposed from the resin on the second plane and led out to the outside of the case,
The second terminal is exposed from the resin on the third plane and led out to the outside of the case.
The switch according to claim 1. A concave portion including a bottom surface and a side surface connected to the bottom surface and surrounding the bottom surface and opening upward; a side wall including an annular upper end surface connected to the side surface; and a bottom portion positioned below the concave portion and connected to the side wall. With a case,
A first terminal derived from the case,
Equipped with
The bottom is
A first plane at a position overlapping the recess,
A second plane which is located above the first plane and in a direction in which the first terminal is led out from the first plane, and which overlaps with the upper end surface;
A first projecting portion and a second projecting portion which are provided on the second plane and project downward from the second plane;
Including
The first terminal is arranged so as not to overlap with the first plane and intersects with the second plane so as to pass through a position between the first projecting portion and the second projecting portion,
Wherein the first distal end of the tip and the second protruding portion of the protruding portion, the laid first flat surface and the same position, located in the first flat surface by remote upward,
switch. The first terminal is exposed from the case on the second plane and is led out of the case.
The switch according to claim 15.

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