JP2021026813A - Push button switch - Google Patents

Abstract

To provide a push button switch that can reduce the cost with less risk of poor continuity.SOLUTION: A push button switch according to the present invention that switches between conduction and non-conduction of a plurality of fixed electrodes 751 and 752 includes: a key top 2 that accepts external input to switch between conduction and non-conduction; and a metal contact member 10 fixed to portions on the fixed electrodes 751 and 752 side of the key top 2. The metal contact member 10 includes a contact portion 11 facing the fixed electrodes 751 and 752, and a peripheral wall portion 12 protruding from the periphery of the contact portion 11 toward the key top 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a push button switch.

Conventionally, as a movable contact member (hereinafter referred to as "contact member") for a push button switch that switches between conduction and non-conduction between a plurality of fixed electrodes on a substrate, a metal foil, a metal plate, and a wire mesh (hereinafter, "" "Metal contact member") is widely used. In a push button switch using such a metal contact member, a flat metal contact member is fixed to a portion of the key top on the fixed electrode side via an elastic sheet (see, for example, Patent Document 1).

FIG. 10 shows a vertical cross-sectional view of a push button switch having a basic configuration. FIG. 11 shows a vertical cross-sectional view of a conventionally known push button switch. FIG. 12 shows a method of forming the push button switch of FIG.

Before explaining the known push button switch, the basic configuration of the push button switch will be described. The push button switch 701 having the basic configuration shown in FIG. 10 is provided with a dome portion 703 that expands in diameter outward in the radial direction of the key top 702 at the lower end of the periphery of the key top 702 having a substantially cylindrical shape. The push button switch 701 includes a base portion 704 that extends radially outward from the lower opening of the dome portion 703. The base portion 704 is a portion fixed on the substrate 750 on which the push button switch 701 is arranged. The contact member 710 is attached to the pusher portion 702p directly below the key top 702 in the inner space of the dome portion 703, and includes a contact member 710 having a conductive member on the surface. The contact member 710 can be lowered until the dome portion 703 is deformed by pushing the key top 702 and comes into contact with the fixed electrode 751 and the fixed electrode 752 on the substrate 750. The contact member 710 can electrically connect the fixed electrode 751 and the fixed electrode 752 by bringing the conductive member into contact with the fixed electrode 751 and the fixed electrode 752 at the same time.

Next, the configuration of a known push button switch will be described. In the conventionally known push button switch 801 shown in FIG. 11, the contact member 710 portion of the push button switch 701 as shown in FIG. 10 is configured as the contact member 810. Since the other parts are the same as the basic configuration shown in FIG. 10, they are designated by the same reference numerals as those in FIG. 10 and the description thereof will be omitted. The contact member 810 includes an elastic sheet 811 and a metal contact member 812 fixed to the surface of the elastic sheet 811 on the side of the fixed electrodes 751 and 752. The metal contact member 812 is firmly fixed to the pusher portion 702p of the key top 702 via the elastic sheet 811. In the push button switch 801 configured in this way, the metal contact member 812 can be brought into contact with the fixed electrode 751 and the fixed electrode 752 by pushing the key top 702. As a result, conduction / non-conduction between the fixed electrode 751 and the fixed electrode 752 can be switched.

Next, a method of forming a known push button switch will be described. A conventionally known method for forming the push button switch 801 shown in FIG. 12 is as follows. First, the large-sized elastic sheet 811 and the large-sized metal contact member 812 are integrally molded (ST81). Next, the integrally molded large-sized elastic sheet 811 and the metal contact member 812 are punched to the outer size of the contact member 810 using a punching device (for example, a punch) 990 (ST82). Next, the punched contact member 810 is put into a die 991 and integrally molded with the key top 702 or the like (ST83). As a result, the push button switch 801 in which the metal contact member 812 is firmly fixed to the key top 702 via the elastic sheet 811 can be formed.

Japanese Unexamined Patent Publication No. 2004-134241

In the known push button switch 801, since the contact member 810 is composed of a plurality of parts of the elastic sheet 811 and the metal contact member 812, the cost of each part is reflected in the product cost. Further, in the known push button switch 801, when forming, a step of integrally molding a large-sized elastic sheet 811 and a large-sized metal contact member 812 (ST81) and punching it to the outer size of the contact member 810 (ST82). As a result, the manufacturing time becomes longer, and the longer manufacturing cost is reflected in the product cost. For these reasons, the known push button switch 801 has a problem that it is difficult to reduce the product cost.

Further, in the known push button switch 801, the contact member 810 has a flat plate shape composed of the elastic sheet 811 and the metal contact member 812, and a plurality of contact members 810 are stacked and supplied to the manufacturing apparatus (die 991). become. Therefore, when the contact member 810 is handled in a mold for integrally molding with the key top 702 or the like, a plurality of contact members 810 are handled in close contact with each other, and a double contact push button switch is manufactured. In some cases. In a push button switch formed of double contacts, one contact member may peel off between a plurality of contact members and the stroke may become long, which may cause poor continuity.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a push button switch capable of realizing cost reduction with less risk of conduction failure.

(1) The push button switch according to the embodiment for achieving the above object is a push button switch for switching between conduction and non-conduction between a plurality of fixed electrodes, and for switching between conduction and non-conduction. A key top that receives an external input and a metal contact member fixed to a portion of the key top on the fixed electrode side are provided, and the contact portion where the metal contact member faces the fixed electrode and the periphery of the contact portion. It has a peripheral wall portion protruding from the key top side.
(2) In the contact member according to another embodiment, preferably, the metal contact member is formed in a dish shape so that the peripheral wall portion surrounds the portion of the key top on the fixed electrode side.
(3) In the contact member according to another embodiment, preferably, the metal contact member further has a flange portion protruding in the circumferential direction from the tip end portion of the peripheral wall portion.
(4) In the contact member according to another embodiment, preferably, the metal contact member is fixed to the key top with an adhesive.
(5) In the contact member according to another embodiment, preferably, the contact portion has irregularities in the thickness direction thereof.
(6) In the contact member according to another embodiment, preferably, the metal contact member has at least the contact portion as a wire mesh.
(7) In the contact member according to another embodiment, preferably, the metal contact member includes a gold layer at least on the surface of the contact portion.
(8) In the contact member according to another embodiment, preferably, the peripheral wall portion of the metal contact member is flush with the side surface of the portion of the key top on the fixed electrode side.
(9) In the contact member according to another embodiment, preferably, the peripheral wall portion of the metal contact member has an inwardly projecting portion.
(10) In the contact member according to another embodiment, a through hole is preferably formed in the contact portion of the metal contact member.

According to the present invention, it is possible to provide a push button switch capable of realizing cost reduction with less risk of conduction failure.

FIG. 1 shows a vertical sectional view of a push button switch according to the first embodiment of the present invention. FIG. 2 shows an enlarged view of the periphery of the contact member of the push button switch of FIG. FIG. 3 shows a method of forming the push button switch of FIG. FIG. 4 shows an enlarged view of the periphery of the contact member of the push button switch according to the second embodiment of the present invention. FIG. 5 shows a method of forming the push button switch of FIG. FIG. 6 shows an enlarged view of the periphery of the contact member of the push button switch according to the third embodiment of the present invention. FIG. 7 shows an enlarged view of the periphery of the contact member of the push button switch according to the fourth embodiment of the present invention. FIG. 8 shows a modified example of the peripheral wall portion of the push button switch according to the embodiment of the present invention. FIG. 9 shows a modified example of the contact portion of the metal contact member according to the embodiment of the present invention. FIG. 10 shows a vertical cross-sectional view of a push button switch having a basic configuration. FIG. 11 shows a vertical cross-sectional view of a conventionally known push button switch. FIG. 12 shows a method of forming the push button switch of FIG.

Next, an embodiment of the present invention will be described with reference to the drawings. The embodiments described below do not limit the invention according to the claims, and all of the elements and combinations thereof described in the embodiments are essential for the means for solving the present invention. Is not always the case. In addition, each drawing is a schematic view so that the features can be understood, and does not strictly reflect the actual dimensions.

(Embodiment 1)
The push button switch 1 according to the first embodiment of the present invention will be described.

(1-1. Configuration of push button switch according to the first embodiment)
FIG. 1 shows a vertical sectional view of a push button switch according to the first embodiment of the present invention. FIG. 2 shows an enlarged view of the periphery of the contact member of the push button switch of FIG.

As shown in FIG. 1, the push button switch 1 according to the embodiment includes a key top 2 having a pusher portion 2p protruding on a surface (contact side surface) that functions as a contact. Further, the push button switch 1 includes a metal contact member 10 fixed to the pusher portion 2p of the key top 2. The push button switch 1 is arranged so that the metal contact member 10 faces the fixed electrodes 751 and 752 on the substrate 750. In the push button switch 1, similarly to the conventional push button switch, the key top 2 receives an external input, and the metal contact member 10 fixed to the fixed electrodes 751 and 752 of the key top 2 is attached to the surface of the substrate 750. Moves back and forth in the vertical direction. As a result, the metal contact member 10 comes into contact / non-contact with the substrate 750, and plays a role of switching conduction / non-conduction between the fixed electrodes 751 and 752 on the substrate 750. Although the pusher portion 2p of the key top 2 in the push button switch 1 of the present embodiment is formed in a cylindrical shape, it may have a shape other than the cylindrical shape.

The metal contact member 10 has a substantially disk-shaped contact portion 11 facing the fixed electrodes 751 and 752, and a peripheral wall portion 12 projecting from the periphery of the contact portion 11 toward the key top 2. The metal contact member 10 is formed in a dish shape so that the peripheral wall portion 12 surrounds the portions of the key top 2 on the fixed electrode side 751, 752. In the metal contact member 10, the inner surfaces of the contact portion 11 and the peripheral wall portion 12 are fixed to the key top 2 with an adhesive (which may be referred to as an adhesive layer) 20. That is, the metal contact member 10 is joined to the pusher portion 2p so that the surfaces of the fixed electrodes 751 and 752 of the pusher portion 2p of the key top 2 are completely covered by the contact portion 11. The metal contact member 10 is a metal plate made of nickel silver, stainless steel, copper, aluminum, silver or the like and subjected to drawing or bending. The metal contact member 10 includes a gold layer, for example, by plating the surface of at least the contact portion 11 with gold. The metal contact member 10 of the present embodiment has a substantially circular shape when viewed from the contact side, but the shape of the metal contact member takes into consideration the arrangement or shape of the fixed electrodes 751 and 752 on the substrate 750. It can be changed as appropriate. Further, the peripheral wall portion 12 is preferably an annular shape protruding from the entire periphery of the contact portion 11, but may be partially missing. Further, the height of the peripheral wall portion 12 may or may not be the same, and can be appropriately set in consideration of the shape of the pusher portion 2p of the key top 2.

(1-2. Method of forming a push button switch according to the first embodiment)
FIG. 3 shows a method of forming the push button switch of FIG.

As shown in FIG. 3, the push button switch 1 is formed by sequentially performing the adhesive application step ST1 and the adhesive step ST2. In the following description, the material, shape, characteristics, etc. of each component are the same as those of the push button switch 1 described above, and in FIG. 3, the same reference numerals as those in FIG. 1 are given and the description thereof will be omitted. ..

In the adhesive application step ST1, as shown in FIG. 3 (left), the adhesive 20 is applied to the inner surface of the metal contact member 10. In consideration of the final form of the push button switch 1, the inside of the metal contact member 10 may be filled with an adhesive 20 in an amount that fills the space between the pusher portion 2p of the key top 2 and the metal contact member 10. .. Further, the adhesive 20 may be applied to the tip of the pusher portion 2p of the key top 2.

In the bonding step ST2, as shown in FIG. 3 (right), the surface of the tip of the pusher portion 2p of the key top 2 and the inner surface of the metal contact member 10 are brought into close contact with each other via the adhesive 20, and the key top 2 and the metal contact are contacted. Wait until the bonding with the member 10 is completed. When the bonding is completed, as shown in FIG. 3 (right), it is preferable that the adhesive 20 slightly overflows from the mouth of the metal contact member 10.

Through these steps, a push button switch 1 in which a dish-shaped metal contact member 10 is fixed to the pusher portion 2p of the key top 2 is formed.

(1-3. Action / effect according to the first embodiment)
The push button switch 1 according to the first embodiment has a contact portion 11 in which the metal contact member 10 faces the fixed electrodes 751 and 752, and a peripheral wall portion 12 projecting from the periphery of the contact portion 11 toward the key top 2. Since the members 10 are joined not only on the contact portion 11 but also on the inner surface of the peripheral wall portion 12, the joining strength of the metal contact member 10 is high. This is because the metal contact member 10 has the peripheral wall portion 12, so that the joint area is wide and the external force can be received by the shearing force. As a result, the metal contact member 10 can be directly bonded to the key top 2 with sufficient bonding strength without using an elastic sheet as in the conventional conductive member. Therefore, according to the push button switch 1, in order to form the contact member, a step of integrally molding the conductive member and the elastic sheet is not required, and the contact member can be formed by a single part. It is possible to reduce the cost of parts.

Further, since the metal contact member 10 has the peripheral wall portion 12, even if a plurality of metal contact members 10 are overlapped with each other during handling, the contact area with each other is small and the parts are difficult to stick to each other. Therefore, according to the push button switch 1, since a plurality of push button switches 1 are difficult to be handled by sticking to each other at the time of manufacturing, the possibility of being manufactured with double contacts is low, and there is little possibility of poor continuity.

Therefore, the push button switch 1 according to the first embodiment is a push button switch that is less likely to have poor continuity and can realize cost reduction.

Further, in the push button switch 1 according to the first embodiment, the metal contact member 10 is formed in a dish shape so that the peripheral wall portion 12 surrounds the portions of the key top 2 on the fixed electrodes 751 and 752 sides. Since the peripheral wall portion 12 connected to the periphery receives an external force in the shearing direction, the joint strength between the key top 2 and the metal contact member 10 can be further increased. Further, in the push button switch 1, the metal contact member 10 prevents the resin or rubber member having fluidity from flowing out from the inside of the peripheral wall portion 12 during manufacturing and wrapping around the surface of the contact portion 1, so that there is a risk of poor continuity. Can be further reduced.

Further, in the push button switch 1 according to the first embodiment, since the metal contact member 10 is fixed to the key top 2 with the adhesive 20, it is not necessary to use expensive manufacturing equipment, so that the manufacturing cost Can be reduced.

Further, in the push button switch 1 according to the first embodiment, since the metal contact member 10 is provided with a gold layer at least on the surface of the contact portion 11, the electrical resistance is low and the contact surface is not easily corroded. The risk of

(Embodiment 2)
The push button switch 101 according to the second embodiment of the present invention will be described.

FIG. 4 shows an enlarged view of the periphery of the contact member of the push button switch according to the second embodiment of the present invention. FIG. 5 shows a method of forming the push button switch of FIG.

The push button switch 101 according to the second embodiment basically has the same configuration as the push button switch 1 according to the first embodiment, but the fixed form of the metal contact member is different from the push button switch 1 according to the first embodiment. different. That is, as shown in FIG. 4, the form of the push button switch 101 is not a form in which the metal contact member 110 is fixed by using an adhesive. Hereinafter, the points different from those of the first embodiment will be described, and the description of the same configuration as that of the first embodiment will be omitted. The pusher portion 102p of the key top 102 in the push button switch 101 of the present embodiment corresponds to the shape of the metal contact member 110 described below, and has a stepped cylinder in which the outer diameter of the tip portion is slightly narrower and has a step. It is formed in a shape.

The metal contact member 110 of the push button switch 101 according to the second embodiment has the same shape as the metal contact member 10 of the first embodiment. The metal contact member 110 has a substantially disk-shaped contact portion 111, and a peripheral wall portion 112 projecting from the periphery of the contact portion 111 toward the key top 102. The metal contact member 110 is formed in a dish shape so that the peripheral wall portion 112 surrounds the tip portion of the pusher portion 102p of the key top 102. As shown in FIG. 4, the metal contact member 110 is fixed to the pusher portion 102p of the key top 102 without using an adhesive. Further, the metal contact member 110 is fixed to a portion where the outer diameter of the tip portion of the pusher portion 102p of the key top 102 is slightly narrower. As a result, the peripheral wall portion 112 is flush with the side surface of the exposed portion of the pusher portion 2p of the key top 2.

As shown in FIG. 5, the push button switch 101 according to the second embodiment is formed by sequentially performing the in-mold placement step ST11 and the vulcanization step ST2. In the following description, the material, shape, characteristics, etc. of each component are the same as those of the push button switch 101 described above, and the description thereof is omitted in FIG. 5 with the same reference numerals as those in FIG. To do.

In the mold in-mold arrangement step ST11, the metal contact member 110 is arranged in the recess corresponding to the outer shape of the metal contact member 110 of the mold 91 so that the contact portion 111 faces the bottom surface side of the recess of the mold 91. As described above, since the metal contact member 110 has the peripheral wall portion 112, it is difficult for a plurality of parts to stick to each other and be handled. Therefore, there is little possibility that a plurality of the molds 91 are overlapped with each other.

In the vulcanization step ST2, an unvulcanized key top material is placed in the mold 91 and heat-pressed to form the key top 202. As a result, the vulcanized key top 202 and the metal contact member 110 are joined.

Since the push button switch 101 according to the second embodiment basically has the same configuration as the push button switch 1 according to the first embodiment, it has the same effect as the push button switch 1 according to the first embodiment, and there is a risk of poor continuity. It is a push button switch that can reduce costs.

Further, according to the push button switch 101 according to the second embodiment, since the peripheral wall portion 111 of the metal contact member 110 is flush with the side surface of the pusher portion 102p of the key top 102, it is difficult to get caught on the side surface side and from the side surface side. It is possible to reduce the possibility that the metal contact member 110 will come off due to the external force of.

(Embodiment 3)
The push button switch 201 according to the third embodiment of the present invention will be described.

FIG. 6 shows an enlarged view of the periphery of the contact member of the push button switch according to the third embodiment of the present invention.

The push button switch 201 according to the third embodiment basically has the same configuration as the push button switch 1 according to the first embodiment, but has a metal contact member having a different shape. That is, as shown in FIG. 6, in the push button switch 201, the mouth side of the metal contact member 210 has a flange shape. Hereinafter, the points different from those of the first embodiment will be described, and the description of the same configuration as that of the first embodiment will be omitted. The pusher portion 202p of the key top 202 in the push button switch 201 of the present embodiment is formed in a cylindrical shape like the pusher portion 2p of the key top 2 of the first embodiment.

As shown in FIG. 6, the metal contact member 210 of the push button switch 201 according to the third embodiment has a substantially disk-shaped contact portion 211, a peripheral wall portion 212 protruding from the periphery of the contact portion 211 toward the key top 202, and a peripheral wall portion 212. It has a flange portion 213 that projects in the circumferential direction from the tip end portion (which may be referred to as an “open end”) of the peripheral wall portion 212. The metal contact member 210 is formed in a dish shape in which the peripheral wall portion 212 surrounds the tip portion of the pusher portion 202p of the key top 202. In the metal contact member 210, the inner surfaces of the contact portion 211 and the peripheral wall portion 212 are fixed to the key top 202 with an adhesive 20. The adhesive 20 that overflows from the gap between the key top 202 and the metal contact member 210 is received by the flange portion 213.

The push button switch 201 according to the third embodiment is formed in the same manner as the push button switch 1 according to the first embodiment.

The push button switch 201 according to the third embodiment basically has the same configuration as the push button switch 1 according to the first embodiment. Therefore, the push button switch 201 has the same effect as the push button switch 1 according to the first embodiment, is less likely to have poor continuity, and is a push button switch capable of realizing cost reduction.

Further, according to the push button switch 201 according to the third embodiment, since the metal contact member 210 has a flange portion 213 protruding in the circumferential direction from the tip end portion of the peripheral wall portion 212, a fluid adhesive or the like is in contact during manufacturing. It becomes easier to prevent it from wrapping around the surface. Therefore, the key top 202 and the metal contact member 210 can be joined with confidence by using an adhesive or the like.

(Embodiment 4)
The push button switch 301 according to the fourth embodiment of the present invention will be described.

FIG. 7 shows an enlarged view of the periphery of the contact member of the push button switch according to the fourth embodiment of the present invention.

The push button switch 301 according to the fourth embodiment basically has the same configuration as the push button switch 1 according to the first embodiment, but the fixed form of the metal contact member and the shape of the metal contact member are different. That is, as shown in FIG. 7, in the push button switch 301, the metal contact member 310 is not fixed by using an adhesive, and the mouth side of the metal contact member 310 has a flange shape. Hereinafter, the points different from those of the first embodiment will be described, and the description of the same configuration as that of the first embodiment will be omitted. The pusher portion 302p of the key top 302 in the push button switch 301 of the present embodiment corresponds to the shape of the metal contact member 310, and is formed in a stepped cylindrical shape like the pusher portion 102p of the key top 102 of the second embodiment. Has been done.

The metal contact member 310 of the push button switch 301 according to the fourth embodiment has the same shape as the metal contact member 210 of the third embodiment. As shown in FIG. 7, the metal contact member 310 includes a substantially disk-shaped contact portion 311, a peripheral wall portion 312 protruding from the periphery of the contact portion 311 toward the key top 302, and a tip portion of the peripheral wall portion 312 (““ It has a flange portion 313 that projects in the circumferential direction from the "open end"). The metal contact member 310 is formed in a dish shape in which the peripheral wall portion 312 surrounds the tip portion of the pusher portion 302p of the key top 302.

The push button switch 301 according to the fourth embodiment is formed in the same manner as the push button switch 101 according to the second embodiment.

The push button switch 301 according to the fourth embodiment basically has the same configuration as the push button switch 1 according to the first embodiment. Therefore, the push button switch 301 has the same effect as the push button switch 1 according to the first embodiment, is less likely to have poor continuity, and is a push button switch capable of realizing cost reduction.

Further, since the push button switch 301 according to the fourth embodiment has the same configuration as the push button switch 101 according to the second embodiment and the push button switch 201 according to the third embodiment, the effects described in the second embodiment and the third embodiment are obtained. Also has.

(Other embodiments)
Although the present invention has been described above based on the above embodiment, the present invention is not limited to the above embodiment. It can be carried out in various aspects within a range that does not deviate from the purpose, and for example, the following modifications are also possible.

The number, shape, position, size, material, and the like of the components described in the above embodiment are examples, and can be changed as long as the effects of the present invention are not impaired.

In the above embodiment, the peripheral wall portion of the metal contact member is drawn with the same diameter in the height direction thereof, but the present invention is not limited to this. For example, as shown below, the metal contact member 410 of the push button switch 401 may be adopted. FIG. 8 shows a modified example of the peripheral wall portion of the push button switch according to the embodiment of the present invention.

In the push button switch 401 shown in FIG. 8, a metal contact member 410 is fixed to the tip of the pusher portion 402p of the key top 402, as in the above embodiment. The metal contact member 410 has a substantially disk-shaped contact portion 411 and a peripheral wall portion 112 projecting from the periphery of the contact portion 411 toward the key top 402. The metal contact member 410 is formed in a dish shape so that the peripheral wall portion 412 surrounds the tip portion of the pusher portion 402p of the key top 402. The peripheral wall portion 412 has an inwardly projecting portion 414 protruding inward in the middle in the height direction thereof. According to the push button switch 401, the metal contact member 410 is fitted into the inside of the key top 402 and is hard to come off due to the inner protrusion 414, so that the reliability can be improved.

In the above embodiment, the contact portion of the metal contact member has been described as a disk shape having a flat surface, but the present invention is not limited thereto. For example, although not shown, the metal contact member may have at least a wire mesh at the contact portion. Further, for example, it may be in the form of the metal contact members 510A to E shown below. FIG. 9 shows a modified example of the contact portion of the metal contact member according to the embodiment of the present invention.

The metal contact member 510A shown in the upper part (left) of FIG. 9 has a substantially disk-shaped contact portion 511A and a peripheral wall portion 512A protruding from the periphery of the contact portion 511A. The contact portion 511A has a convex portion 515 at the outer central portion.

The metal contact member 510B shown in the upper part (right) of FIG. 9 has a substantially disk-shaped contact portion 511B and a peripheral wall portion 512B protruding from the periphery of the contact portion 511B. The contact portion 511B has a recessed position 516 in the outer central portion.

The metal contact member 510C shown in the middle (left) of FIG. 9 has a substantially disk-shaped contact portion 511C and a peripheral wall portion 512C projecting from the periphery of the contact portion 511C. The contact portion 511C has a plurality of convex portions 517 extending from the outer central portion to the outer peripheral portion.

The metal contact member 510D shown in the middle (right) of FIG. 9 has a substantially disk-shaped contact portion 511D and a peripheral wall portion 512D projecting from the periphery of the contact portion 511D. The contact portion 511D has a plurality of recessed positions 518 extending from the outer central portion to the outer peripheral portion.

The metal contact member 510E shown in the lower part of FIG. 9 has a substantially disk-shaped contact portion 511E and a peripheral wall portion 512E protruding from the periphery of the contact portion 511E. The contact portion 511E has a through hole 519 in the outer central portion and the like.

That is, in the metal contact member, the contact portion may have irregularities in the thickness direction thereof. As described above, according to the push button switch having irregularities on the contact portion of the metal contact member, even if foreign matter enters between the metal contact member and the fixed electrodes 751 and 752, the foreign matter enters the concave position and the convex portion. Since the continuity can be ensured, the risk of poor continuity can be further reduced.

The push button switch according to the present invention can be used, for example, as a push button switch used in various devices such as industrial robots, home electric appliances, and PCs, in addition to in-vehicle devices of automobiles.

1,101,201,301,401 ... Push button switch, 2,102,202,302,402 ... Key top, 10,110,210,310,410,510A to E ... Metal contact member, 11,111,211 311, 411,511A to E ... Contact part, 12,112,212,321,421,512A to E ... Peripheral wall part, 20 ... Adhesive, 213,313 ... Flange part, 414 ... Inside protruding part, 319 ... Through hole , 751, 752 ‥ Fixed electrode

Claims (10)

A push button switch for switching between conduction and non-conduction between a plurality of fixed electrodes.
A key top that accepts an external input for switching between conduction and non-conduction,
A metal contact member fixed to a portion of the key top on the fixed electrode side is provided.
A push button switch having a contact portion where the metal contact member faces the fixed electrode, and a peripheral wall portion that projects from the periphery of the contact portion toward the key top side. The push button switch according to claim 1, wherein the metal contact member is formed in a dish shape so that the peripheral wall portion surrounds the portion of the key top on the fixed electrode side. The push button switch according to claim 1 or 2, wherein the metal contact member further has a flange portion protruding in the circumferential direction from the tip end portion of the peripheral wall portion. The push button switch according to any one of claims 1 to 3, wherein the metal contact member is fixed to the key top with an adhesive. The push button switch according to any one of claims 1 to 4, wherein the contact portion has irregularities in the thickness direction thereof. The push button switch according to any one of claims 1 to 4, wherein the metal contact member has at least the contact portion as a wire mesh. The push button switch according to any one of claims 1 to 6, wherein the metal contact member includes at least a gold layer on the surface of the contact portion. The push button switch according to any one of claims 1 to 7, wherein the peripheral wall portion of the metal contact member is flush with the side surface of the portion of the key top on the fixed electrode side. The push button switch according to any one of claims 1 to 8, wherein the peripheral wall portion of the metal contact member has an inwardly projecting portion. The push button switch according to any one of claims 1 to 9, wherein a through hole is formed in the contact portion of the metal contact member.

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