JP7101079B2 - 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 is convex existing around a plurality of concave portions constituting the uneven surface. When the portion forms a plane or a curved surface and the convex portion has the portion of the plane, the area of the portion of the plane is larger than the area of the region excluding the area of the portion of the plane from the plane projection area of the conductive contact. small.

(2) In the contact member according to another embodiment, the plurality of concave portions forming the uneven surface are preferably curved.

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

(4) The contact member according to another embodiment preferably includes a non-precious metal body and a rubber-like elastic body in this order with respect to the noble metal layer.

(5) In the contact member according to another embodiment, preferably, both 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 present. It is uneven

(6) 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.

(7) 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 the non-precious metal body prior to the pressing step, and the non-precious metal layer forming step. A joining step of joining the precious metal body and the rubber-like elastic body is further performed.

(8) 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.

(9) 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 shows the contact member in the plan view in FIG. 1 (1B) so that the concave portion 33 and the convex portion 32 can be distinguished from each other. FIG. 5 is a cross-sectional view (5A) of the contact member according to the second embodiment of the present invention, which is the same as that of FIG. 3, and an enlarged cross-sectional view (5B, 5C,) of several typical convex portions in the cross-sectional view. 5D) are shown respectively. FIG. 6 is a view seen from the uneven surface side of the contact member of FIG. 5, and shows a plane and a curved surface in the convex portion and a plurality of concave portions arranged in the region of the convex portion so as to be distinguishable. A plan view is shown. 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 convex portions 32 existing around the plurality of concave portions 33 constituting the uneven surface 31 form a flat surface or a curved surface. The convex portion 32 is a portion that protrudes outward from the uneven surface 31 when compared with the concave portion 33. In the contact member 1 shown in FIG. 1, the convex portion 32 is a continuous surface located around the plurality of concave portions 33, and is a flat surface or a curved surface slightly protruding outward in the cross-sectional view of FIG. .. The convex portion 32 may be a region divided into two or more depending on the arrangement state of the concave portion 33. Further, the plurality of recesses 33 constituting the uneven surface 31 are curved surfaces that are recessed inward in a cross-sectional view. More specifically, the concave portion 33 is a hemispherical concave portion that is recessed inward from the convex portion 32. When the bottom of the recess 33 is curved, the foreign matter M easily falls from the recess 33 onto the contact 41 when the contact 41 shown in FIG. 3 is contacted, and the risk of the foreign matter M being caught in the recess 33 can be reduced. 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 one end side having 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.

As shown in FIG. 2, the distance P between the recesses 33 (distance between the bottoms of the recesses 33, 33) is preferably larger than the diameter D of the opening surface of the recess 33. This is because the convex portions 32 are regions having a predetermined interval. The uneven surface 31 can be formed so that, for example, P = 0.5 to 2.0 mm, D = 0.2 to 0.6 mm, and the depth of the recess 33 = 0.1 to 1.0 mm. The recess 33 may be arranged in any way within the concave-convex surface 31. For example, the concave portion 33 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 concave portion 33 is formed in an irregular arrangement structure. Is also good. Further, the plurality of recesses 33 may have the same shape or dimensions as each other, and conversely, at least one recess 33 may have a different shape or dimensions from the other recesses 33.

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. Even when a foreign substance having an electric resistance larger than that of the conductive contact is present, the shape of the concave-convex surface 31 is such that the probability that the foreign substance M is located in the recess 33 is high. This is because, as will be described later, the convex portion 32 has a curved surface or a flat surface on the protruding side thereof, and even if the convex portion 32 has a flat surface, the area of the flat surface portion causes the uneven surface 31 to be projected onto the flat surface. This is because it is smaller than the total area of the area excluding the area of the portion of the plane in the plane projection area (for example, the plane projection area of the plurality of recesses 33). Further, when the tip of the convex portion 32 is a curved surface, when the foreign matter M is sandwiched between the tip of the convex portion 32 and the contact point 41, it easily moves to the concave portion 32 side. As a result, when the foreign matter M is large enough to fit in the space of the concave portion 33 and one foreign matter M is present on the uneven surface 31, the foreign matter M is located in the concave portion 33 and the contact 41 and the precious metal. It is possible to achieve the purpose of reducing the probability of not obstructing the electrical connection with the layer 30 to less than 50%. The "planar projection area" is also referred to as a plan view area, and is also referred to as, for example, the projection area (or projection area) of the target portion (concave-convex surface 31, concave portion 33, etc.) when the contact member 1 is projected onto the circuit board 40. May be). This also applies to the contact member 1a described later.

FIG. 4 shows the contact member in the plan view in FIG. 1 (1B) so that the concave portion 33 and the convex portion 32 can be distinguished from each other.

The plane projection area projected onto the plane of the uneven surface 31 of the noble metal layer 30 is the area of a large circle shown in FIG. 4, and is the plane projection area (= S2) of the small circular recess 33. It is the sum with the area (= S1) of the part shown by the diagonal line. When the concave portion 33 is formed on the concave-convex surface 31 so that S1 <S2, as described above, one small foreign matter M that fits in the space of the concave portion 33 is present in the region of the concave-convex surface 31. Even at any time, the probability that the foreign matter M is located in the recess 33 can be more than 50%.

(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. 5 is a cross-sectional view (5A) of the contact member according to the second embodiment of the present invention, which is the same as that of FIG. 3, and an enlarged cross-sectional view (5B, 5C,) of several typical convex portions in the cross-sectional view. 5D) are shown respectively.

The contact member 1a according to the second embodiment has a plurality of concave portions 33 and convex portions 32a continuously formed around the concave portions 33. The plurality of recesses 33 have a shape of being recessed in a curved shape on the non-precious metal body 20 side. The convex portion 32a has a shape in which the tip portion thereof is a curved surface and / or a flat surface. FIG. 5 shows an example in which a flat surface is formed on a part of the convex portion 32a and a curved surface is formed on another part. The convex portions 32a of the regions b1, b2, and b3 have substantially the same cross-sectional shape, do not have a flat surface at the tip thereof, and have a mountain shape having a curved surface (C1) as a whole. The convex portion 32a of the region b4 has a mountain shape having a flat surface (F2) at the tip thereof and a curved surface (C2) around the convex portion 32a. The curved surface (C2) is formed in a steep curved shape having one apex that is recessed from the plane (F2) toward the recess 33 in the cross-sectional view of (5C). The convex portion 32a of the region b5 has a mountain shape having a flat surface (F3) whose tip is smaller than a flat surface (F2) and a curved surface (C3) around the convex portion 32a. The curved surface (C3) is formed in a curved shape having one apex that bulges toward the tip side from the plane (F3) in the cross-sectional view of (5D). When the convex portion 32a is a curved surface, the convex portion 32a can make point contact or line contact with the contact 41. On the other hand, when the convex portion 32a has a flat surface at its tip portion, the convex portion 32a can come into surface contact with the contact 41.

FIG. 6 is a view seen from the uneven surface side of the contact member of FIG. 5, and shows a plane and a curved surface in the convex portion and a plurality of concave portions arranged in the region of the convex portion so as to be distinguishable. A plan view is shown.

In FIG. 6, the concave portion 33 is shown in white, the flat portion (F) of the convex portion 32a is shown in black, and the curved surface portion (C) of the convex portion 32a is shown by dispersion of black dots. The curved surface portion (C) is a portion that easily guides the foreign matter M to the recess 33 when it comes into contact with the foreign matter M. The flat surface portion (F) is a region where the foreign matter M may be sandwiched between the contact point 41 and the foreign matter M. The area (S1) of the flat surface portion (F) shown in black is less than 50% of the plane projection area (S1) of the uneven surface 31, that is, the flat surface of the curved surface portion (C) and the concave portion 33. By making S1 smaller than the projection area (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 50%. The purpose of reducing to less than can be achieved. It is more preferable to form the convex portion 32a so that the cross section of any portion of the convex portion 32a is a curved surface portion (C). This is because it becomes easier to guide the foreign matter M into the recess 33.

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 member 1a.

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.

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

1,1a ... contact member, 10 ... rubber-like elastic body, 15 ... first joint surface, 20 ... non-precious metal body, 25 ... second joint surface, 30 ... noble metal Layer (example of conductive contact), 31 ... Concavo-convex surface, 32, 32a ... Convex, 33 ... Concave, 62 ... Mold, 90 ... Push button switch member, S1 ... .. Area of flat surface, S ... Plane projection area of conductive contact, S2 ... Area of area excluding area of flat surface.

Claims (5)

Equipped with conductive contacts with an uneven surface at one end
The convex portions existing around the plurality of concave portions constituting the uneven surface form a flat surface or a curved surface.
When the convex portion has the flat surface portion, the area of the flat surface portion is smaller than the area of the region excluding the area of the flat surface 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 provided in this order with respect to the precious metal layer.
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 contact member according to claim 1, wherein the plurality of recesses forming the uneven surface are curved surfaces. The method for manufacturing the contact member according to claim 1 or 2 .
The present invention comprises 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 the noble metal layer as the conductive contact on the surface of the 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 3 , 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 or 2 .

Images