JP7101078B2 - Contact members, their manufacturing methods, and push button switch members - Google Patents

Description

The present invention relates to a contact member, a method for manufacturing the contact member, and a push button switch member provided with the contact member.

Conventionally, as a member for a push button switch that can be attached to and detached from a contact on a circuit board, a member provided with a gold-plated contact has been known (see Patent Document 1). Further, in order to prevent conduction failure due to the presence of foreign matter between the gold-plated contact and the contact on the circuit board, a push button switch member having a hole in the gold-plated contact is also known (patented). See Document 2). Furthermore, in order to obtain a low-cost, long-life push button switch member that is not easily affected by dust and oil stains on the circuit board, the metal sheet is gold-plated in an island shape and the areas other than the gold-plated area are etched. A member for a push button switch having a concave portion is also known (see Patent Document 3).

Japanese Unexamined Patent Publication No. 07-014454 Japanese Unexamined Patent Publication No. 2010-11936 US2016 / 0372276A1

However, the above-mentioned known push button switch member has the following problems. As described above, the push button switch member disclosed in Patent Document 1 is prone to conduction failure due to foreign matter on the circuit board. Since the push button switch member disclosed in Patent Document 2 has a hole in the surface of the contact, when the rubber and the contact are adhered, the adhesive fills the hole, and the effect of poor continuity to foreign matter is obtained. Will be lost. Further, since the push button switch member disclosed in Patent Document 2 has a hole, the contact area is reduced, so that there is a high risk of conduction failure.

The present invention solves the above-mentioned problems, that is, a contact member which is not easily affected by foreign matter on a circuit board and can realize high conduction without reducing the contact area, and a push button switch member provided with the contact member. The purpose is to provide.

(1) The contact member according to the embodiment for achieving the above object is provided with a conductive contact having an uneven surface at one end, and a plurality of convex portions constituting the uneven surface are outwardly oriented. When it is a convex portion that protrudes and has a curved or flat tip, and the tip has a flat portion, the area of the flat portion is from the plane projection area of the conductive contact to the flat portion. It is smaller than the area of the area excluding the area.

(2) In the contact member according to another embodiment, the conductive contact is preferably a layer of a precious metal.

(3) The contact member according to another embodiment preferably includes a non-precious metal body and a rubber-like elastic body in this order on the surface of the precious metal layer opposite to the convex portion.

(4) In the contact member according to another embodiment, preferably, the first joint surface between the rubber-like elastic body and the non-precious metal body and the second joint surface between the non-precious metal body and the noble metal layer are formed. Both are uneven

(5) The method for manufacturing a contact member according to an embodiment of the present invention is a method for manufacturing any of the above-mentioned contact members, wherein a mold for forming an uneven surface on a conductive contact is formed. It includes a pressing step of pressing on the surface of a conductive contact to form the uneven surface.

(6) The method for manufacturing a contact member according to another embodiment preferably includes a noble metal layer forming step of forming a noble metal layer as the conductive contact on the surface of a non-noble metal body prior to the pressing step, and the above-mentioned. Further, a joining step of joining the non-precious metal body and the rubber-like elastic body is performed.

(7) The method for manufacturing a contact member according to another embodiment preferably further includes a punching step of punching the outer shape of the contact member after the pressing step.

(8) The push button switch member according to the embodiment of the present invention includes any of the above-mentioned contact members.

According to the present invention, it is not easily affected by foreign matter on the circuit board, and high conduction can be realized without reducing the contact area.

FIG. 1 shows a perspective view (1A) of a contact member according to the first embodiment of the present invention and a plan view (1B) of the contact member, respectively. FIG. 2 shows a cross-sectional view taken along the line AA and an enlarged view thereof when the contact member is cut along the line AA of FIG. 1 (1B). FIG. 3 shows a situation in which a layer of precious metal of a contact member comes into contact with a contact when a foreign substance is present on the surface of the contact of the circuit board. FIG. 4 is a plan view (4A) of the contact member according to the second embodiment of the present invention, which is the same as that of FIG. The figure (4B) is shown. FIG. 5 shows a cross-sectional view taken along the line AA when the contact member is cut along the line AA of FIG. 4 (4A). FIG. 6 shows a cross-sectional view of the contact member of FIG. 1 in the same view as FIG. 2 of the modified example 1 (6A) and the modified example 2 (6B), respectively. FIG. 7 shows a flow of a main process for manufacturing a contact member according to an embodiment of the present invention. FIG. 8 is a cross-sectional view showing each step in the flow of FIG. 7. FIG. 9 shows a vertical cross-sectional view of a push button switch member including the contact member of FIG.

Next, an embodiment of the present invention will be described with reference to the drawings. It should be noted that 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 indispensable for the means for solving the present invention. It is not always the case.

1. 1. Contact member (first embodiment)
FIG. 1 shows a perspective view (1A) of a contact member according to the first embodiment of the present invention and a plan view (1B) of the contact member, respectively. FIG. 2 shows a cross-sectional view taken along the line AA and an enlarged view thereof when the contact member is cut along the line AA of FIG. 1 (1B).

The contact member 1 according to the present embodiment includes a conductive contact having an uneven surface 31 at one end. The plurality of convex portions 32 constituting the uneven surface 31 are convex portions that project outward and have a curved surface at the tip. The "outward direction" here means a direction toward the outside from the uneven surface 31. The conductive contact of the contact member 1 is preferably a precious metal layer 30. Further, the contact member 1 preferably includes a non-precious metal body 20 and a rubber-like elastic body 10 in this order on a surface of the noble metal layer 30 opposite to the uneven surface 31. The noble metal layer 30, the non-precious metal body 20, and the rubber-like elastic body 10 preferably become thinner from the rubber-like elastic body 10 toward the noble metal layer 30, but the non-precious metal body 20 is more than the rubber-like elastic body 10. May be thicker.

In this embodiment, the concave-convex surface 31 is preferably a hemispherical convex portion 32 on a flat surface (a surface in which the contact member 1 becomes horizontal when the concave-convex surface 31 is allowed to stand upward). Is provided with a plurality of. The shape of the convex portion 32 may be any protruding curved surface other than the hemispherical surface. The convex portion 32 is a constituent portion that enables point contact with a flat surface to which the uneven surface 31 contacts. The flat surface existing around the convex portion 32 means the concave portion 33 on the uneven surface 31. The concave portion 33 is not limited to a flat surface, and may be a portion having any shape such as an inclined surface inclined at a predetermined acute angle with respect to the horizontal surface, a wave surface, a hemispherical inner concave surface, a conical or pyramidal concave portion, or the like. ..

As shown in FIG. 2, the distance P between the convex portions 32 (distance between the vertices of the convex portions 32, 32) is preferably larger than the bottom diameter D of the convex portions 32. This is because the recesses 33 are regions having a predetermined interval. However, as will be described later, the recess 33 may be a line-shaped valley to form a concave-convex surface 31 with P = D. The uneven surface 31 has, for example, P = 0.5 to 2.0 mm, D = 0.2 to 0.6 mm, and the height of the convex portion 32 from the flat surface (here, the concave portion 33) = 0.1 to. It can be formed to be 1.0 mm. The convex portion 32 may be arranged in any way within the uneven surface 31. For example, the convex portion 32 may be formed in a regular arrangement structure such as a grid pattern or a concentric circle shape in a plan view of the uneven surface 31, and conversely, the convex portion 32 is formed in an irregular arrangement structure. May be. Further, the plurality of convex portions 32 may have the same shape or the same dimensions as each other, and conversely, at least one convex portion 32 has a different shape or dimension from the other convex portions 32. Is also good.

In the contact member 1, preferably, the first joint surface 15 between the rubber-like elastic body 10 and the non-precious metal body 20 and the second joint surface 25 between the non-precious metal body 20 and the noble metal layer 30 are both uneven. .. This configuration is mainly due to the manufacturing process of the contact member 1 described later. However, it is also possible to form the uneven first joint surface 15 and the second joint surface 25 regardless of the manufacturing method. For example, the contact member 1 having the first joint surface 15 and the second joint surface 25 can be manufactured by using the following manufacturing method. A rubber-like elastic body 10 having an uneven surface at one end and a non-precious metal body 20 having an uneven surface that can be in close contact with the surface of the one end of the rubber-like elastic body 10 are joined to each other on the uneven surface. Then, another uneven surface is formed on the other end of the non-precious metal body 20, and the precious metal layer 30 is coated there.

(1) Rubber-like elastic body The rubber-like elastic body 10 may be a material that can be elastically deformed, that is, a natural rubber, a synthetic rubber, or a synthetic resin as long as it is an elastomer. Preferred materials for the rubber-like elastic body 10 are thermosetting elastomers such as silicone rubber, urethane rubber, isoprene rubber, ethylene propylene rubber, natural rubber, ethylene propylene diene rubber, nitrile rubber (NBR) or styrene butadiene rubber (SBR); Includes urethane-based, ester-based, styrene-based, olefin-based, butadiene-based, fluorine-based and other thermoplastic elastomers, or composites thereof. Among these, silicone rubber or urethane rubber is more preferable as the material of the rubber-like elastic body 10.

In this embodiment, the rubber-like elastic body 10 has a disk shape having a thickness smaller than the diameter, but has a form other than the disk, for example, a cylinder having a thickness equal to or larger than the diameter, or a triangle or a polygon having one end surface thereof. A member having the shape of a polygonal plate or a polygonal column may be used.

(2) Non-precious metal body The non-precious metal body 20 is not particularly limited as long as it is a material different from the noble metal layer 30 and preferably does not contain a noble metal as a main material, but is not particularly limited, but is nickel (Ni) or copper (Cu). ), Zinc (Zn), tin (Sn), tungsten (W), stainless steel (SUS), or any alloy thereof. As an example of the non-precious metal body 20, it is more preferably composed of an alloy mainly composed of Cu, Ni and Zn (a so-called “nickel silver” alloy). Further, it is also possible to form a base plating layer (plating layer mainly composed of Ni) on the surface of the non-precious metal body 20 (for example, Cu or nickel silver), and then form the following noble metal layer 30. As a suitable metal constituting the base plating layer, an alloy containing Cu, Zn, Sn, Cr, Ni and Ag can be exemplified, and when Western white is used as the non-precious metal body 20, Zn is displayed on the surface of Western white. It is preferable to form a base plating layer made of an alloy containing Cu and Cr, and more preferably to form a base plating layer made of an alloy containing Ni, Ag and Sn (however, Ag is not the main material). .. When Au is used as the noble metal layer 30, Cu or Ni is preferable as the base plating layer, and Ni is particularly preferable. At this time, a metal other than Cu or Ni may be slightly contained. Like the rubber-like elastic body 10, the non-precious metal body 20 has a disk shape having a thickness smaller than the diameter, but may have a form other than the disk.

(3) Precious metal layer The precious metal layer 30 is composed of gold (Au), platinum (Pt), silver (Ag), palladium (Pd), rhodium (Rh), iridium (Ir), ruthenium (Ru) or osmium (Os). ), Or an alloy mainly composed of these exemplified metals. The noble metal layer 30 is preferably made of a material having excellent conductivity, low hardness, easy plastic deformation, and easy thin film formation, and is more preferably made of, for example, Au. Further, in addition to hard gold plating in which cobalt (Co) or Ni is added to Au, a Pd—Ni alloy (an alloy in which a small amount of Ni is added to Pd) can be preferably exemplified.

FIG. 3 shows a situation in which a layer of precious metal of a contact member comes into contact with a contact when a foreign substance is present on the surface of the contact of the circuit board.

On the contact 41 formed on the circuit board 40, a foreign substance M (insulation or contact, if not insulating) that hinders the electrical connection between the contact member 1 and the contact 41 comes into contact with the contact 41 or the contact 41. When a foreign substance having an electric resistance larger than that of the conductive contact is present, the shape of the uneven surface 31 of the noble metal layer 30 of the contact member 1 contributes to guiding the foreign substance M to the recess 33. This is because the plurality of convex portions 32 formed on the uneven surface 31 of the precious metal layer 30 have a hemispherical shape and enable point contact with the contact 41. When the foreign matter M is sandwiched between the contact point 41 and the convex portion 32 near the top of the convex portion 32, the foreign matter M is forcibly moved to the concave portion 33 as shown by an arrow in the upper part of FIG. As a result, the convex portion 32 and the contact 41 can be easily electrically connected. The convex portion 32 is formed by a curved surface protruding in the direction of the contact 41. Therefore, the foreign matter M can smoothly move to an arbitrary position in the concave portion 32 that is not sandwiched between the convex portion 32 and the contact point 41. The general size of the foreign matter M referred to here is a size that fits inside the recess 33.

(Second Embodiment)
Next, the contact member according to the second embodiment will be described. It should be noted that duplicate explanations may be omitted for the parts common to the first embodiment.

FIG. 4 is a plan view (4A) of the contact member according to the second embodiment of the present invention, which is the same as that of FIG. The figure (4B) is shown.

The contact member 1a according to the second embodiment is different from the contact member 1 according to the first embodiment in that a flat portion 32a is provided at the tip of the convex portion 32, and other portions are common. The plurality of convex portions 32 constituting the uneven surface 31 are convex portions that project outward and have a flat tip. The area (S1) of the flat portion 32a is smaller than the area (S2) of the region excluding the area (S1) of the flat portion 32a from the plane projection area (S) of the uneven surface 31 of the noble metal layer 30. The "planar projection area" is also referred to as a plan view area, and for example, the projection area (or projection area) of the target portion (concave-convex surface 31, concave portion 33, etc.) when the contact members 1, 1a are projected onto the circuit board 40. It may also be called). Since the convex portion 32 is provided with a flat portion 32a at its tip, it can be surface-contacted with the contact 41.

In FIG. 4, the concave portion 33, which is a flat surface, is shown in white, the flat portion 32a (F) at the tip of the convex portion 32 is shown in black, and the curved surface (C) of the convex portion 32 is shown by dispersion of black dots. The curved surface (C) is a portion that easily leads to the recess 33 when it comes into contact with the foreign matter M. The flat portion 32a (F) is a region where the foreign matter M may be sandwiched between the contact point 41 and the foreign matter M. The total area (S1) of the plane (F) shown in black is less than 50% of the plane projection area (S) of the uneven surface 31, that is, the projection area on the plane of the curved surface (C) and the recess 33. By making S1 smaller than (= S2), even when one foreign matter M having a size that fits in the recess 33 is present in the uneven surface 31, the probability of poor continuity to the contact 41 is less than 50%. The purpose of reducing the area can be achieved.

FIG. 5 shows a cross-sectional view taken along the line AA when the contact member is cut along the line AA of FIG. 4 (4A).

As shown in FIG. 5, the distance P between the convex portions 32 (distance between the in-plane centers of the flat portions 32a and 32a) is preferably larger than the bottom diameter D of the convex portions 32. As will be described later, the recess 33 may be a line-shaped valley to form a concave-convex surface 31 with P = D. Similar to the first embodiment, the uneven surface 31 has P = 0.5 to 2.0 mm, D = 0.2 to 0.6 mm, and the height of the convex portion 32 from the flat surface (here, the concave portion 33). It can be formed so as to be 0.1 to 1.0 mm.

(Modification example)
FIG. 6 shows a cross-sectional view of the contact member of FIG. 1 in the same view as FIG. 2 of the modified example 1 (6A) and the modified example 2 (6B), respectively. The modifications 1 and 2 can also be applied to a contact member 1a shown in FIG. 4 having a flat portion 32a at the tip of the convex portion 32.

The contact member 1b according to the first modification has a recess 33b. A part or all of the recess 33b has a curved shape recessed on the non-precious metal body 20 side. In FIG. 6 (6A), a part of the recess 33b is recessed in a curved surface shape. The concave portion 33b preferably has a shape in which the convex portion 32 is inverted. When the bottom of the recess 33b is curved, the foreign matter M easily falls from the recess 33b onto the contact 41 when the contact 41 is contacted as shown in FIG. 3, and the risk of the foreign matter M being caught in the recess 33b can be reduced. Since the shape of the recess 33b is the same as that of the contact member 1 described above, duplicate description will be omitted.

The contact member 1c according to the second modification has a recess 33c. Part or all of the recess 33c has the shape of a valley recessed in a line on the non-precious metal body 20 side. In FIG. 6 (6B), all of the recesses 33c are in the shape of a line-shaped valley. Therefore, the distance P between the convex portions 32 = the bottom diameter D of the convex portions 32. Since the shape of the recess 33c is the same as that of the contact member 1 described above, duplicate description will be omitted.

Even if the shape of the concave portions 33b and 33c is different from the shape of the concave portions 33 (flat surface) as in the first and second modifications, the tip of the convex portion 32 is small as in the convex curved surface or the second embodiment. By making it flat, the foreign matter M can be easily guided to the recesses 33b and 33c, and the conduction failure with the contact 41 can be less likely to occur.

2. 2. Method for Manufacturing Contact Member Next, a method for manufacturing the contact member according to the embodiment of the present invention will be described.

FIG. 7 shows a flow of a main process for manufacturing a contact member according to an embodiment of the present invention. FIG. 8 is a cross-sectional view showing each step in the flow of FIG. 7.

As shown in FIG. 7A, an example of a method for manufacturing a contact member includes a noble metal layer forming step (S110) for forming a noble metal layer 30 as a conductive contact on the surface of the non-precious metal body 20, and a non-precious metal body. A joining step (S120) for joining the rubber-like elastic body 10 and the rubber-like elastic body 10 and a mold for forming an uneven surface 31 on the noble metal layer 30 as a conductive contact are pressed on the surface of the noble metal layer 30. It includes a pressing step (S130) for forming the uneven surface 31 and a punching step (S140) for punching the outer shape of the contact member 1. If it is not necessary to reduce the size of the contact member 1, S140 may be omitted. The same applies to the flow shown in FIG. 7 (7B) below.

Further, as another example of the method for manufacturing the contact member, as shown in FIG. 7 (7B), a joining step (S100) for joining the non-precious metal body 20 and the rubber-like elastic body 10 and the surface of the non-precious metal body 20 In addition, a noble metal layer forming step (S110) for forming the noble metal layer 30 as a conductive contact, and a mold for forming an uneven surface 31 on the noble metal layer 30 as a conductive contact are provided on the noble metal layer 30. It includes a pressing step (S130) of pressing on the surface to form an uneven surface 31 and a punching step (S140) of punching the outer shape of the contact member 1.

Hereinafter, each manufacturing process will be described in detail with reference to FIG. 8 by taking the flow of FIG. 7 (7A) as an example.

(1) Precious metal layer forming step (S110)
This step is a step of forming a noble metal layer 30 as a conductive contact on the surface of the non-precious metal body 20. In this step, a non-precious metal body 50 with a noble metal layer is obtained (see a1). The method for forming the noble metal layer 30 is plating (either electrolytic plating or electroless plating is possible), vapor deposition, sputtering, CVD, application of a solvent containing noble metal (brush coating, spraying, etc.), and an inkjet method. The printing by the above can be exemplified, and in particular, the plating can be more preferably exemplified.

(2) Joining step (S120)
This step is a step of joining the non-precious metal body 20 and the rubber-like elastic body 10. The non-precious metal body 20 is here a part of the non-precious metal body 50 with a noble metal layer. By carrying out this step, a bonded body 51 having a three-layer structure of a rubber-like elastic body 10, a non-precious metal body 20, and a noble metal layer 30 is obtained (see a2).

(3) Pressing process (S130)
This step is a step of pressing the mold 62 for forming the uneven surface 31 on the noble metal layer 30 onto the surface of the noble metal layer 30 to form the uneven surface 31. More specifically, the mold 62 is a convex mold called a punch. In this step, the bonded body 51 is placed inside the concave mold 60 so that the precious metal layer 30 is on top, and the mold 62 is placed in the space 61 above the bonded body 51, and then both molds 60 are inserted. , 62 is molded. An uneven surface 63 capable of forming an uneven surface 31 is formed on the surface of the mold 62 that comes into contact with the bonded body 51 (see a3).

After the pressing step, a molded body 70 having an uneven surface 31 formed on the precious metal layer 30 is obtained (see a4). Since the rubber-like elastic body 10 functions as a cushioning material during the pressing process, the first joint surface 15 between the rubber-like elastic body 10 and the non-precious metal body 20 and the second joint surface between the non-precious metal body 20 and the noble metal layer 30 Both 25 become uneven. Such joint surfaces 15 and 25 contribute to the firm bonding of the rubber-like elastic body 10, the non-precious metal body 20, and the noble metal layer 30.

(4) Punching process (S140)
This step is a step of punching the outer shape of the contact member 1 after the pressing step. Specifically, the molded body 70 is placed on the jig 80 provided with the through hole 81, and the shaft portion 86 of the punch 85 is pushed toward the through hole 81 from above the molded body 70 (see a5). .. A flange portion 87 having a diameter larger than that of the shaft portion 86 is preferably formed at one end of the shaft portion 86 in the outward direction. Through this step, the contact member 1 is obtained (see a6).

If the molded body 70 can be used as it is as the contact member 1, the punching step (S140) may not be performed. Further, in FIG. 8, only one through hole 81 and one shaft portion 86 are drawn, but the jig 80 having a plurality of through holes 81 is provided with the same number of shaft portions 86 as the number of through holes 81. It is also possible to push in the provided punch 85 to punch out a plurality of contact members 1 from the molded body 70.

The method for manufacturing the contact member does not necessarily require another step as long as it has at least a pressing step (S130). For example, when forming the uneven surface 31 at one end of the conductive contact having excellent conductivity, it is not necessary to form the noble metal layer 30 on the surface of the non-precious metal body 20. Furthermore, it is not necessary to join the rubber-like elastic body 10 to the non-precious metal body 20. The above-mentioned manufacturing method can be similarly applied not only to the contact member 1 but also to the contact members 1a, 1b, 1c.

3. 3. Push button switch member Next, the push button switch member according to the embodiment of the present invention will be described.

FIG. 9 shows a vertical cross-sectional view of a push button switch member including the contact member of FIG.

As shown in FIG. 9, the push button switch member 90 is arranged on the circuit board 40 and elastically reciprocates in the direction of the circuit board 40 (downward in FIG. 9) and vice versa (upward in FIG. 9). It is a movable member. The push button switch member 90 preferably has a key top 91 having a substantially rectangular cuboid or a substantially cylindrical shape, a dome portion 93 connected in a skirt shape to the radial outside of the key top 91, and a radial outer side of the dome portion 93. It is provided with a flange portion 94 which is connected to and fixed to the circuit board 40. The key top 91 is provided with a downward projecting portion 92 projecting in the direction of the circuit board 40 on the lower surface facing the circuit board 40. The circuit board 40 includes a plurality of contacts 41, 41 in a non-contact state with each other at positions facing the downward protrusion 92. On the other hand, the downward projecting portion 92 includes the contact member 1 at the tip thereof and at a position where it can come into contact with the contacts 41 and 41. The contact member 1 is joined to the downward projecting portion 92 so that the uneven surface 31 faces the contacts 41 and 41. The joining method may include any method such as adhesion, heat fusion, fitting, screwing and the like.

When not pressed from above the key top 91, the contact member 1 and the contacts 41, 41 maintain a non-contact state. The key top 91 is pressed from above, and when the pressing exceeds a certain threshold value, the dome portion 93 is suddenly deformed (buckled) and the contact member 1 comes into contact with the contacts 41 and 41. By this contact, an energization path is formed from the contact 41 to the other contact 41 through the contact member 1, so that the switch is turned ON (or OFF). When the pressure on the key top 91 is released, the dome portion 93 returns to its original shape due to its own elastic force, so that the key top 91 rises. As a result, the contact member 1 is separated from the contacts 41 and 41.

In this embodiment, the push button switch member 90 is a member integrally molded of a rubber material. However, the push button switch member 90 is not a member integrally molded of a rubber material, and may be made of any material as long as at least the dome portion 93 is made of the rubber material. The rubber material constituting the push button switch member 90 is heat-cured such as silicone rubber, urethane rubber, isoprene rubber, ethylene propylene rubber, natural rubber, ethylene propylene diene rubber, nitrile rubber (NBR) or styrene butadiene rubber (SBR). Sexual elastomer; It is preferable to use a thermoplastic elastomer such as urethane-based, ester-based, styrene-based, olefin-based, butadiene-based, and fluorine-based, or a composite thereof. Among the candidates for the above materials, silicone rubber is particularly preferable. Further, the shape of the dome portion 93 may be a reverse bowl shape protruding outward or a reverse fan shape protruding inward of the dome portion 93 in a vertical cross-sectional view. Further, the dome portion 93 may be a member having any shape such as a truncated cone shape or a truncated cone shape.

4. Other Embodiments Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these, and can be variously modified and implemented.

For example, a member having a layer having an excellent conductivity other than a precious metal may be used for the conductive contact. For example, conductive contacts made of aluminum or tungsten may be used. Instead of sequentially providing the non-precious metal body 20 and the rubber-like elastic body 10 on the surface opposite to the uneven surface 31 of the conductive contact, only the non-precious metal body 20 and the rubber-like elastic body 10 may be provided. Further, only the conductive contact may be used as the contact member 1.

The plurality of components of each of the above-described embodiments can be freely combined except when they cannot be combined with each other. For example, the push button switch member 90 may include a contact member 1a, a contact member 1b, or a contact member 1c.

The contact member according to the present invention can be used, for example, as an electric contact of a switch.

1,1a, 1b, 1c ... contact member, 10 ... rubber-like elastic body, 15 ... first joint surface, 20 ... non-precious metal body, 25 ... second joint surface, 30 ... .. Precious metal layer (an example of conductive contact), 31 ... Concavo-convex surface, 32 ... Convex part, 32a ... Flat part, 62 ... Mold, 90 ... For push button switch Member, S1 ... Area of a flat surface portion, S ... Planar projection area of a conductive contact, S2 ... Area of a region excluding the area of a flat surface portion.

Claims (4)

Equipped with conductive contacts with an uneven surface at one end
The plurality of convex portions constituting the uneven surface are convex portions that protrude outward and have a curved or flat tip.
When the tip has the plane portion, the area of the plane portion is smaller than the area of the region excluding the area of the plane portion from the plane projection area of the conductive contact.
The conductive contact is a layer of precious metal and
A non-precious metal body and a rubber-like elastic body are sequentially provided on the surface of the precious metal layer on the opposite side of the convex portion.
A contact member in which the first joint surface between the rubber-like elastic body and the non-precious metal body and the second joint surface between the non-precious metal body and the noble metal layer are both uneven . The method for manufacturing the contact member according to claim 1 .
A pressing step of pressing a die for forming an uneven surface on a conductive contact onto the surface of the conductive contact to form the uneven surface.
Prior to the press process,
A noble metal layer forming step of forming a noble metal layer as a conductive contact on the surface of a non-precious metal body,
The joining step of joining the non-precious metal body and the rubber-like elastic body,
A method for manufacturing contact members. The method for manufacturing a contact member according to claim 2 , further comprising a punching step of punching the outer shape of the contact member after the pressing step. A member for a push button switch including the contact member according to claim 1 .

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