JP6435500B2 - switch - Google Patents

Description

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

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

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

  FIG. 5 is a cross-sectional view showing the arrangement 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 the conventional switch. In addition, about drawing, it is set as the thing of the illustration state in which illustration of the solder was abbreviate | omitted.

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

  As shown in FIG. 5 and FIG. 6, the case 1 is formed in a rectangular shape in a top view having a concave portion opened upward. As shown by a dotted line in FIG. 6, the opening of the recess is formed in an oval shape when viewed from above, and a switch contact portion is formed in the 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 disposed at the center position of the bottom surface of the recess of the case 1, and the second fixed contact 20 is disposed at the outer peripheral position of the bottom surface of the recess. The movable contact 30 formed in an upward convex dome shape is disposed in the recess with the lower end of the outer periphery abutting on the second fixed contact 20. The lower center surface of the movable contact 30 faces the first fixed contact 10 with a gap.

  In the case 1, two first terminals 15 are led out from the lower end of one end in the longitudinal direction, and two second terminals 26 are led out from the lower end of the other end 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 constitute a conventional switch.

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

  As shown in FIGS. 7 and 8, the bottom surface of the bottom portion of the case 1 is substantially rectangular and has a first flat portion 3 at a central position formed on a flat surface, and on both sides in the longitudinal direction with respect to the first flat portion 3. It has the 2nd plane part 5 which was provided adjacently and was formed in the flat surface in the position slightly higher than the 1st plane part 3. As shown in FIG. That is, the lower surface of the case 1 is configured from the right side to the left side in the longitudinal direction in the order of one second plane part 5, the first plane part 3, and the other second plane part 5, and its height position is , Have a step at the position of the boundary. Note that one second flat surface portion 5 and the other second flat surface portion 5 are set at the same height position.

  The two first terminals 15 are led out from one second plane part 5, and the two second terminals 26 are led out from the other second plane part 5. Here, each of the first terminal 15 and the second terminal 26 has an exposed portion (see FIG. 6 and FIG. 8) expressed at the same height as the corresponding second plane portion 5, and the height thereof. Projects horizontally outward at the position. This exposed portion is provided in order to secure a soldering area in accordance with the downsizing of the switch.

  The switch is mounted by soldering the first terminal 15 and the second terminal 26 to land portions 52 and 54 provided on the wiring board 50. That is, at the time of mounting, cream solder is applied to each of the 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 positioned thereon. . Thereafter, the first terminal 15 and the second terminal 26 are soldered and fixed to the land portions 52 and 54 through a reflow process and are surface-mounted.

  In the mounted state, the switch has a difference in height because the second plane part 5 leading out the first terminal 15 and the second terminal 26 is set at a higher position than the first plane part 3. Thus, the height dimension of the solder is absorbed, and the first flat surface portion 3 of the case 1 can be mounted in a state of being in contact with or close to the wiring board 50. Accordingly, the switch can be mounted in a state where 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 switch is further downsized, the distance between the first terminals 15 and the distance between the second terminals 26 become smaller, and the land portions 52 and 54 are usually formed in a rectangular shape. The boundary between one second plane part 5 and the first plane part 3 and the boundary between the other second plane part 5 and the first plane part 3 are both the first terminal 15 and the second terminal 26. It had to be comprised in what has a linear level | step-difference part orthogonal to each protrusion 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, the one second plane portion 5, the first plane portion 3, and the other second plane portion 5 are arranged in this order. As it flows into the reflow furnace, the melting timing of the cream solder in the individual second flat portions 5 may be shifted.

  For example, when the cream solder on the side of the one second flat surface portion 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 one second plane portion 5 and the first plane portion 3 as a fulcrum, and on the other second plane portion 5 side. There was a possibility that the second terminal 26 would float.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a switch that can be reduced from being tilted during reflow soldering.

  In order to achieve the above object, the present invention provides, as a case, the bottom surface of the bottom portion, which is provided at a position higher than the first plane portion, adjacent to the first plane portion, and adjacent to the first plane portion. The switch is configured using a second flat surface portion from which at least one of the first flat surface portion is derived and a protrusion portion protruding downward is provided on the second flat surface portion.

  In this case, when reflow soldering to the wiring board, even if a phenomenon occurs in which the cream solder melts on the second plane portion side and the corresponding terminal is drawn downward, the protruding portion provided on the second plane portion The rotating force applied to the switch itself by contacting the wiring board can be restricted, and the switch can be prevented from being mounted at an inclination.

  According to the present invention, it is possible to obtain an advantageous effect that it is possible to obtain a switch that can be reduced from being tilted during reflow soldering.

Sectional drawing which shows the arrangement | positioning state to the wiring board of the switch by embodiment of this invention Front view Bottom view of a switch according to an embodiment of the invention Bottom view of switch with the same configuration Sectional drawing which shows the arrangement state to the wiring board of the conventional switch Top view Front view Bottom view of conventional switch

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part of the same structure as the past, and detailed description is abbreviate | omitted.

(Embodiment)
FIG. 1 is a cross-sectional view showing a state in which a switch according to an embodiment of the present invention is arranged on a wiring board, FIG. 2 is a front view thereof, FIG. 3 is a bottom view of the switch according to the embodiment of the present invention, and FIG. It is a bottom view of the switch made into composition. In addition, about drawing, it is set as the thing of the illustration state in which illustration of the solder was abbreviate | omitted.

  The switch according to this embodiment is configured as a so-called push switch having a switch contact portion 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 with 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 when viewed from above 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 as in the conventional case. That is, the first fixed contact 10 is disposed at the center position of the bottom surface of the recess of the case 61, and the second fixed contact 20 is disposed at the outer peripheral position of the bottom surface of the recess. The movable contact 30 formed in an upward convex dome shape is disposed in the recess with the lower end of the outer periphery abutting on the second fixed contact 20. The lower center surface of the movable contact 30 faces the first fixed contact 10 with a gap.

  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 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 in the longitudinal direction of the case 61.

  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, the switch according to the embodiment has a lower surface configuration at the bottom of the case 61 that is different from that of the conventional product, thereby reducing mounting in a tilted state when mounted on the wiring board. This will be described below.

  As shown in FIGS. 1 and 3, the bottom surface of the bottom portion of the case 61 has a first flat surface portion 63 at a central position formed in a substantially rectangular shape and a flat surface, and a longitudinal direction with respect to the first flat surface portion 63. It is the same as that of the prior art that the second flat portion 65 is provided adjacent to both sides and formed on a flat surface at a position slightly higher than the first flat portion 63.

  That is, the lower surface of the case 61 is configured 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 as in the conventional case. 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 stepped portion.

  Then, the two first terminals 15 are led out from one second plane portion 65, and the two second terminals 26 are led out from the other second plane portion 65. The two terminals 26 have an exposed portion (see FIG. 3) that is exposed at the same height as the corresponding second flat surface portion 65, and the point protruding horizontally outward at that height position is the conventional point. Is the same. Each of the first terminal 15 and the second terminal 26 can be soldered including the above-described exposed portions.

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

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

  And as the installation position of the protrusion part 71, it shall be provided corresponding to the four corners of the outer edge part vicinity of the case 61 one by one. That is, as shown in FIG. 3, each projecting portion 71 includes two land portions 52 corresponding to the two first terminals 15 illustrated by dotted lines and two land portions corresponding to the two second terminals 26. 54 is arranged at an outer position on the short side. Furthermore, each protrusion 71 is set and provided at a position adjacent to the exposed portion from the second flat portion 65 of each of the first terminal 15 and the second terminal 26.

  In other words, the four protrusions 71 are in a positional relationship in which the two are symmetric with respect to the longitudinal direction of the case 61 when viewed from the center position of the switch, and the two are symmetrical with respect to the short direction. Provided in relation. The two first terminals 15 are led out from a position between the two protrusions 71 provided on the one second flat surface portion 65. The two second terminals 26 are led out from a position between the two protrusions 71 provided on the other second flat surface portion 65.

  In addition, although the installation location of the protrusion 71 is not particularly limited, it is preferably installed in the vicinity of the outer edge portion of the case 61, and in particular, it is preferable that the four corners of the case 61 are easily installed in terms of area.

  The switch according to this embodiment is configured as described above. As for 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 brought into conduction. When the operation is released, the movable contact 30 is restored to the original upward convex dome shape by its own restoring force, and the switch contact portion shown in FIG. 1 returns to the OFF state.

  In the switch according to the embodiment, the first terminal 15 and the second terminal 26 are soldered to the land portions 52 and 54 provided on the wiring board 50 in the same manner as in the related art and are surface-mounted.

  At the time of mounting, cream solder is applied to each of the 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 positioned thereon, and reflow is performed. The first terminal 15 and the second terminal 26 are soldered and fixed to the land portions 52 and 54 through the process.

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

  Subsequently, even if the melting timing of the cream solder is shifted in the respective second flat portions 65 by being flowed into the reflow furnace, the switch according to the embodiment is a phenomenon in which the switch itself tilts on the longitudinal direction side compared to the conventional product. Is reduced.

  That is, for example, when the cream solder on one second flat surface portion 65 side is melted first, the corresponding first terminals 15 are drawn downward by the melted solder so that the first terminal 15 side is lowered. When the case 61 is slightly inclined, the tips of the two protrusions 71 provided on the one second flat surface portion 65 side of the case 61 come into contact with the wiring board 50 first.

  The position where the tips of the two projecting portions 71 abut on the wiring board 50 is configured to be in the vicinity of the first terminal 15, so the distance that the first terminal 15 side is lowered is the conventional product. Can be kept smaller. Thereby, the rotational force applied to the switch itself so as to incline in the longitudinal direction can be regulated, and the inclination of the switch itself can be reduced.

  Although there is a concern that the switch itself may be inclined toward the short side of the case 61 depending on the melted state of the solder of the land portions 52 and 54, the shape setting of the first flat surface portion 63, and the like. If the protrusions 71 are provided corresponding to the four corners in the vicinity of the outer edge of the case 61 one by one, as in the case of the switch, the inclination of the switch itself toward the short direction side is similarly suppressed. It becomes like this.

  As described above, the switch according to the embodiment has a configuration in which two protrusions 71 are provided in the vicinity of the first terminal 15 in one second plane portion 65, and therefore, the switch on the one second plane portion 65 side. By melting the cream solder first, even if the first terminals 15 are drawn downward, it can be realized that the phenomenon that the switch itself tilts in the longitudinal direction is reduced. For this reason, it is possible to provide a switch capable of stable reflow mounting by reducing the mounting at an angle compared to the conventional one during reflow soldering.

  Note that the cross-sectional shape and the tip shape of the protrusion 71 are not particularly limited. For example, the horizontal cross-section may be rectangular or polygonal, or the tip may be a shape other than a spherical shape.

  Further, the positions and number of the protrusions 71 are not limited to those provided one by one at the four corners on the lower surface of the case 61.

  For example, in addition to the above-described one having the projecting portion 71, the projecting portion is also provided between the first terminals 15 of one second plane portion 65 and between the second terminals 26 of the other second plane portion 65. It is good also as what provided 71 one by one. Or it is good also as what provided the protrusion part 71 one by one only between the 1st terminals 15 and between the 2nd terminals 26.

  It is preferable that the protruding portion 71 does not protrude from the first flat surface portion 63 at the tip. This is because, in consideration of the operation state of the switch, it is preferable that the first flat portion 63 that is directly below the operated position is in a mounted state received by the wiring board 50.

  The present invention aims to reduce the mounting of the switch itself at an angle during reflow soldering, and the example of its configuration has been described above with the protrusion 71 provided. Other than 71, it is also possible to have a configuration capable of obtaining an equivalent action.

  An example of such a modification is shown in FIG. The configuration shown in FIG. 4 is configured by using a case 61A instead of using the case 61 provided with the protrusion 71 described above.

  The projecting portion 71 is not provided on the lower surface of the bottom portion of the case 61 </ b> A. Instead, the extending portion 63 </ b> A is integrally provided on the first flat surface portion 63.

  The extending portion 63A of the first flat surface portion 63 is a narrow straight line, and protrudes from the first flat surface portion 63 toward each second flat surface portion 65 along each opposing outer edge on the short side of the case 61A. It is formed in the shape to do. Note that the height of the extending portion 63A is the same as the first flat portion 63, or slightly higher than the first flat portion 63, ie, the first flat portion 63, like the protruding portion 71. It should be set so that there is no height position. The amount of protrusion of the extending portion 63A to 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 in the configuration of this modified example, since the extending portion 63A acts in the same manner as the protruding portion 71 described above, it is possible to reduce a phenomenon in which the switch itself tilts to the longitudinal direction side during reflow soldering. Note that the extension portion 63A may be provided between the first terminals 15 or between the second terminals 26 as in the case of the protruding portion 71.

  In addition, in what was demonstrated above, shape settings, such as the external shape of cases 61 and 61A, are not specifically limited. Further, the lead-out positions and the number of the first terminals 15 and the second terminals 26, the configuration of the switch contact portions, and the like are not particularly limited.

  The switch according to the present invention can be provided as one that can be reduced from being tilted during reflow soldering, and is useful mainly for input operation units of various electronic devices.

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

Claims (7)

A switch in which a plurality of terminals derived from a case are soldered and mounted on the surface of a wiring board,
The case is
A recess,
A bottom located below the recess;
Have
When mounted on the surface, the bottom surface of the bottom located at the position facing the surface,
A first planar portion in a position overlapping the recess,
A second plane part adjacent to the first plane part, provided above the first plane part and outside the position overlapping the recess, and at least one of the terminals is led out;
A protruding portion protruding downward from the second plane portion;
A switch characterized by being provided.  The switch according to claim 1, wherein the protruding portion is provided at a height such that a tip of the protruding portion does not protrude below the first flat surface portion. 2. The switch according to claim 1, wherein an extended portion that protrudes from the first planar portion toward the second planar portion and is connected to the protruding portion is provided on a lower surface of the bottom portion. A case having a recess and a bottom located in a first direction relative to the recess;
A first terminal derived from the case in a second direction orthogonal to the first direction;
With
The bottom is
A first surface overlapping the recess in the first direction;
A second surface located in a third direction opposite to the first direction than the first surface, and located in the second direction from an overlapping region overlapping the recess in the first direction;
A first protrusion protruding from the second surface in the first direction;
I have a,
The second surface is located outward from the overlap region;
switch. The first protrusion is
A first protrusion that is located in a fourth direction perpendicular to the first direction and the second direction from the first terminal and protrudes from the second surface in the first direction;
A second protrusion which is located in a fifth direction opposite to the fourth direction than the first terminal and protrudes from the second surface in the first direction;
including,
The switch according to claim 4. A second terminal led out from the case in a sixth direction opposite to the second direction;
The bottom is
A third surface positioned in the third direction relative to the first surface and positioned in the sixth direction relative to the overlapping region;
A second protrusion protruding from the third surface in the first direction;
I have a,
The third surface is located outward from the overlap region;
The switch according to claim 5. The second protrusion is
A first protrusion located in the fourth direction from the second terminal and protruding from the third surface in the first direction;
A second protrusion located in the fifth direction from the second terminal and protruding from the third surface in the first direction;
including,
The switch according to claim 6.

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