JP5923687B2 - Push switch - Google Patents

Description

  The present invention relates to a push switch used in an operation unit or the like of various electronic devices.

  A conventional push switch will be described below with reference to FIGS.

  8 is a sectional view of a conventional push switch, FIG. 9 is an exploded perspective view thereof, and FIG. 10 is a bottom view thereof.

  In the figure, reference numeral 1 denotes a case formed from a molding resin in a rectangular shape when viewed from above with a concave portion opened upward, and the center contact 3 and the outer contact 5 are fixed to the inner bottom surface of the concave portion by insert molding. Arranged. The terminals respectively connected to the center contact 3 and the outer contact 5 protrude horizontally from the lower position of the side wall of the case 1 toward the outside.

  Reference numeral 7 denotes a movable contact made of an elastic metal thin plate formed in an upward convex circular dome shape, and the lower end of the outer periphery thereof is placed on the outer contact 5 and arranged in the recess of the case 1.

  And the protective sheet 9 which consists of a heat resistant insulating film which has flexibility is affixed on the flat upper end surface of the case 1 through the adhesive layer 11 of a lower surface, and the protective sheet 9 is on the recessed part of the case 1 Covered with.

  The conventional push switch is configured as described above. In the operation, when the central portion of the movable contact 7 is pushed down from the protective sheet 9 and the pressing force exceeds a predetermined magnitude, the central portion of the movable contact 7 is reversed with moderation. As a result, the lower surface of the central portion of the movable contact 7 comes into contact with the central contact 3 to be switched on. When the pressing force is removed, the movable contact 7 is self-returned to the original upward convex shape, and the lower surface of the central portion is separated from the central contact 3 and returns to the original switch-off state.

  As described above, the conventional push switch is configured using the case 1 formed by insert molding. Here, at the time of insert molding of the case 1, in order to arrange the central contact 3 and the outer contact 5 at a predetermined height position, the contacts 3, 5 and the It is indispensable to insert-mold in a state where the extending part from the support is supported, and after that, when the case 1 is lowered to a predetermined temperature, the support pin is removed and the case 1 is formed by a single molding. There were many. For this reason, in the push switch using the case 1 made of an insert-molded product, the one in which the pin hole 15 by the support pin remains in the downwardly opened state in the lower part of the bottom position of the case 1 has become the mainstream.

  As prior art document information related to the invention of this application, for example, Patent Document 1 and Patent Document 2 are known.

JP 2003-234040 A JP 2004-335488 A

  However, in recent years, push switches are also used in various places, and when it is necessary to ensure sufficient waterproofness in the mounted state of the push switch, the switch is soldered on the wiring board by surface mounting. After mounting, it was molded with a waterproof resin so as to cover the entire circumference around the side wall of the case 1 so that at least the pin hole 15 and the outside were isolated from each other. It is the equipment manufacturer that configures the above mounting state, and in response to many requests from the equipment manufacturer, in order to reduce the man-hours for setting the mounting state, etc., improvement of the drip-proof property of the push switch alone There has also been an increase in demands.

  The present invention solves such a problem, and provides a push switch having a structure excellent in drip-proof property in spite of using a case in which a stationary contact is fixed and disposed by insert molding. With the goal.

  In order to achieve the above object, the present invention has the following configuration.

The present invention includes a case made of molded resin, a push switch having a plurality of fixed contacts disposed in the case, the movable contact contacting and separating between the fixed contacts, the bottom position of the case the have a fixed pin holes of lower apertures of the members constituting the exposed contacts, in the case are attached to each other insulating sheet for covering the pin hole from the open mouth side, the lower surface position of the insulating sheet Is a push switch configured to be higher than the lower end position at the bottom position of the case .

If this is the case, it can be easily realized as a single push switch with excellent drip- proofness, and the soldering mounting by reflow , etc., despite using a case where the fixed contact is fixed by insert molding. Even if the air in the pin hole expands and the insulating sheet is partially pushed down, it can be mounted in a stable soldered state with its influence suppressed
It has the effect that it can be realized .

  As described above, according to the present invention, it is possible to provide a push switch having a configuration excellent in drip-proofness even though a case in which a fixed contact is fixed by insert molding is used. Is obtained.

Sectional drawing of the push switch by one embodiment of this invention Exploded perspective view A perspective view of the push switch as viewed from below Bottom view Bottom view of the case itself as the main part The perspective view which looked at the push switch by the other form from the lower side Exploded perspective view Cross section of a conventional push switch Exploded perspective view Bottom view

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. The same components as those of the prior art are denoted by the same reference numerals, and detailed description thereof is omitted.

(Embodiment)
1 is a sectional view of a push switch according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a perspective view of the push switch as viewed from below, FIG. 4 is a bottom view thereof, and FIG. It is a bottom view with the case single-piece | unit used as the principal part.

  In the figure, reference numeral 20 denotes a case formed from a molding resin in a rectangular shape in a top view with a concave portion opened upward, and a central contact 3 and an outer contact 5 are fixed to the inner bottom surface of the concave portion by insert molding. Arranged. The terminal connected to the central contact 3 and the terminal connected to the outer contact 5 are formed in a so-called surface mount type that protrudes horizontally outward from the lower position of the side wall of the case 20. In the recess, the lower end of the outer periphery is placed on the outer contact 5 in a contact state, and the movable contact 7 is disposed in the accommodated state. A protective sheet 9 made of a heat-resistant insulating film having flexibility is stuck on the case 20 via the adhesive layer 11 on the lower surface, and the concave portion of the case 20 is covered with the protective sheet 9. Yes.

  As can be seen from FIGS. 1 and 5, the case 20 has a pin hole 22 in a lower part of the bottom position. The pin hole 22 has a lower opening which is formed by a trace of a support pin that supports the fixed contacts 3 and 5 at the time of insert molding and is on the side in the direction of removal. And as a shape of the lower part of the bottom part position of case 20, at least the circumference position of pin hole 22 is formed in the flat surface shape of the same height located above the lower end position of the above-mentioned bottom part position, The flat surface portion is configured as the installation portion 25. The installation part 25 is for arranging an insulating sheet 30 to be described later, and its shape is not particularly limited, but for convenience of explanation, as shown in FIG. The following description will be made on the assumption that the central portion between the side sides is recessed in a straight band shape with a flat surface having the same height upward. All of the pin holes 22 are located in the installation portion 25, and this is preferable because the flatness of the installation portion 25 can be easily secured. In addition, the installation part 25 is good to set a shape so that the corner | angular part position of case 20 may be remove | excluded.

  Reference numeral 30 denotes an insulating sheet made of an insulating film having heat resistance, the outer shape of which is formed in a rectangular shape, and the adhesive layer 32 is formed on the upper surface thereof. The insulating sheet 30 is bonded to the installation portion 25 from the lower side of the case 20 by the adhesive layer 32, and all the pin holes 22 are covered from the opening side by the single insulating sheet 30. Yes. The insulating sheet 30 preferably has a size that can secure a predetermined adhesive area around the pin hole 22 located on the outermost side. Moreover, it is preferable that the installation part 25 is comprised in the range of the area one size larger than it.

  In addition, the formation depth of the installation part 25 is good to set so that the lower surface side of the insulating sheet 30 may be contained in the case 20 in a state where the insulating sheet 30 is bonded. Furthermore, even when the air in the pin hole 22 expands and the insulating sheet 30 is partially pushed down during reflow soldering or the like, the lower surface of the insulating sheet 30 is lowered from the lower end position of the bottom position of the case 20. If it is set so as not to protrude, it is preferable because the influence can be suppressed and mounting can be performed in a stable soldered state.

  As described above, the push switch according to the present invention is configured. If it is the said structure, even if it uses what the center contact 3 and the outside contact 5 were fixed and arrange | positioned by insert molding as the case 20, the pin hole 22 of the bottom part position of the case 20 is used. Since it is set as the structure covered from the downward side with the insulating sheet 30, it can provide as what was excellent in drip-proof property. In addition, if it is the said structure, since the several pin hole 22 can be covered collectively, the bonding man-hour of the insulating sheet 30 may be reduced. In addition, since the operation | movement of the said component is the same as the past, description is abbreviate | omitted.

  In addition, although it was set as the above using the insulating sheet 30 separate from the protective sheet 9, it is good also as a structure other than that.

  For example, the protection sheet 9 and the insulating sheet 30 may be integrated. That is, as shown in a perspective view of a push switch according to another embodiment of FIG. 6 as viewed from the lower side and an exploded perspective view of FIG. The remaining part of the protective sheet 40 is wound from the side part of the case 20 to the lower surface side of the bottom part, and a part of the protective sheet 40 is bonded to the installation part 25 so as to be insulated. Instead of the sheet 30, the pin hole 22 may be covered from the lower side.

  In addition, when the protective sheet 40 is wound around the case 20, the adhesive layer 42 is positioned upward in the installation portion 25, so that it can be easily substituted for the insulating sheet 30 that covers the pin hole 22 from the lower side, If it is the said structure, it can implement | achieve as what was excellent in drip-proof property, suppressing the increase in the number of parts used.

  And when the part arrange | positioned in the installation part 25 becomes narrow rather than the part which covers the recessed part, the protection sheet 40 considers the stress of the protection sheet 40 with respect to a bending, and is in the position in the upper surface of the case 20. The width of the case 20 is preferably changed so that all portions wound downward from the side portion of the case 20 have a narrow shape. In addition, the winding method is good also as winding in U shape by side view according to the positional relationship of the pin hole 22. FIG. In addition, it is good also as a structure which forms the hollow equivalent to the installation part 25 also in the side part of the case 20, and the protection sheet 40 fits in the hollow.

  In the above description, the case in which the installation portion 25 is provided in the case 20 has been described as an example. However, the installation portion 25 is not necessarily provided, and the pin hole 15 is provided with the insulating sheet 30 and the protection for the conventional case 1. It is good also as a structure covered with a part of sheet | seat 40. FIG.

  As described above, the one based on the idea can be realized as a single push switch and excellent in drip-proof property. In addition, the flux intrusion preventing action during soldering is also improved, which is useful.

  In any of the above forms, the shape of the movable contact to be used is not limited, and the arrangement position of the fixed contact may be appropriately set according to the movable contact. The switch operation may be a multi-stage operation in which two or more switch states can be switched. Further, the idea according to the present invention may be applied to other than the surface mount type, or may be applied to a lateral push type other than the above-described vertical push type.

  Further, the projecting member may be attached corresponding to the position of the central portion of the movable contact, or a metal cover may be added so that the central portion of the movable contact is surely pressed.

  The push switch according to the present invention has an advantageous effect that it can be provided as having excellent drip-proofing properties despite the use of a case in which the fixed contact is fixed by insert molding. In addition, it is useful for operation sections of various electronic devices.

3 central contact 5 outer contact 7 movable contact 9 protective sheet 11, 32, 42 adhesive layer 20 case 22 pin hole 25 installation part 30 insulating sheet 40 protective sheet

Claims (1)

And a case made of molded resin, a push switch having a plurality of fixed contacts disposed in the case, the movable contact contacting and separating between the fixed contacts, and
Has a pin hole of the lower opening port member constituting the fixed contact is exposed at the bottom position of the case,
In the case are attached to each other insulating sheet for covering the pin hole from the open mouth side, the lower surface position of the insulating sheet is configured to be in a position higher than the lower end position at the bottom position of the case Push switch.

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