JP2020027709A - Contact member and method of manufacturing the same, and push button switch member - Google Patents

Abstract

To achieve high continuity without reducing an area of a contact while being less susceptible to a foreign matter on a circuit board.SOLUTION: The present invention relates to: a contact member 1 which includes a conductive contact 30 having an uneven surface 31 at one end thereof; a method of manufacturing the contact member; and a push button switch member 90 including the contact member 1. In the conductive contact, each of a plurality of projections 32 constituting the uneven surface 31 projects outward and has a curved or flat tip, and, when the tip has a flat portion 32a, the area S1 of the flat portion 32a is smaller than an area S2 of a region that is obtained by excluding the area S1 of the flat portion 32a from the plane projection area S of the conductive contact 30.SELECTED DRAWING: Figure 4

Description

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

  2. Description of the Related Art As a member for a push button switch that can be brought into contact with and separated from a contact on a circuit board, a member provided with a gold-plated contact has been known (see Patent Document 1). Also, a push button switch member having a hole in a gold-plated contact is known in order to prevent the occurrence of conduction failure due to the presence of a foreign substance between the gold-plated contact and the contact on the circuit board (Japanese Patent Application Laid-Open (JP-A) no. Reference 2). Furthermore, in order to obtain a low-cost and long-lasting push-button switch member that is less susceptible to dust and oil stain on the circuit board, gold plating is applied in the form of an island on a metal sheet, and the area other than the gold plating area is etched. There is also known a depression member for a push button switch (see Patent Document 3).

JP-A-07-014454 JP 2010-113936 A US2016 / 0372276A1

  However, the above known members for a push button switch have the following problems. As described above, the push button switch member disclosed in Patent Document 1 is liable to cause conduction failure due to foreign matter on the circuit board. The push-button switch member disclosed in Patent Document 2 has a hole in the surface of the contact, so that when the rubber and the contact are bonded, the adhesive fills the hole, and the effect of poor conduction to foreign matter is obtained. Will be lost. Further, the push-button switch member disclosed in Patent Document 2 has a high risk of causing poor conduction because the contact area is reduced by the amount of the hole.

  The present invention solves the above-mentioned problems, that is, a contact member that is hardly affected by foreign matter on a circuit board and can realize high conduction without reducing the contact area, and a push button switch member including the contact member. The purpose is to provide.

(1) A contact member according to an embodiment for achieving the above object includes a conductive contact having an uneven surface at one end, and a plurality of protrusions constituting the uneven surface are outwardly directed. Projecting, and a convex portion having a curved surface or a flat tip, and when the tip has the flat portion, the area of the flat portion is determined by calculating the area of the flat portion from the flat projected area of the conductive contact. It is smaller than the area of the region excluding the area.

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

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

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

(5) A method for manufacturing a contact member according to one embodiment of the present invention is a method for manufacturing any one of the above-described contact members, wherein the mold for forming an uneven surface on the conductive contact is provided by the method described above. A pressing step of pressing the surface of the conductive contact to form the uneven surface.

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

(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) A member for a push button switch according to one embodiment of the present invention includes any of the above-mentioned contact members.

  ADVANTAGE OF THE INVENTION According to this invention, it is hard to be influenced by the foreign material on a circuit board, and can implement | achieve high conduction | electrical_connection without reducing the area of a contact.

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 when the contact member is cut along the line AA in FIG. 1 (1B) and an enlarged view thereof. FIG. 3 shows a situation where the noble metal layer of the contact member contacts the 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 FIG. 1 (1B), and a convex part and a plane part existing at the tip in the plan view are distinguishably shown. (4B) is shown. FIG. 5 is a sectional view taken along the line AA when the contact member is cut along the line AA in FIG. 4 (4A). FIG. 6 is a sectional view of Modification Example 1 (6A) and Modification Example 2 (6B) of the contact member of FIG. FIG. 7 shows a flow of main steps of manufacturing the contact member according to the embodiment of the present invention. FIG. 8 is a sectional view showing each step in the flow of FIG. FIG. 9 is a longitudinal sectional view of a member for a push button switch including the contact member 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 the elements and combinations described in the embodiments are essential to the solution of the present invention. Is not always the case.

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 when the contact member is cut along the line AA in FIG. 1 (1B) and an enlarged view thereof.

  The contact member 1 according to the present embodiment includes a conductive contact having an uneven surface 31 at one end. The plurality of protrusions 32 forming the uneven surface 31 are protrusions projecting outward and having a curved end. The “outward direction” here refers to a direction outward from the uneven surface 31. The conductive contact of the contact member 1 is preferably a layer 30 of a noble metal. The contact member 1 preferably includes a non-precious metal body 20 and a rubber-like elastic body 10 in that order on a surface of the precious metal layer 30 opposite to the uneven surface 31. The noble metal layer 30, the non-noble metal body 20 and the rubber-like elastic body 10 preferably decrease in thickness from the rubber-like elastic body 10 toward the noble metal layer 30. May be thicker.

  In this embodiment, the uneven surface 31 preferably has a hemispherical convex portion 32 on a flat surface (a surface that is horizontal when the contact member 1 is placed on the uneven surface 31 upward). Are provided. The shape of the convex portion 32 may be any protruding curved surface other than a hemispherical surface. The convex portion 32 is a component that enables point contact with a plane where the uneven surface 31 contacts. The flat surface existing around the convex portion 32 means the concave portion 33 in the uneven surface 31. In addition, 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, a wavefront, a hemispherical concave inner surface, a conical or pyramidal concave portion, or the like. .

  As shown in FIG. 2, the distance P between the protrusions 32 (the distance between the vertices of the protrusions 32, 32) is preferably larger than the bottom diameter D of the protrusions 32. This is because the concave portions 33 are regions having a predetermined interval. However, as described later, the concave portion 33 may be a line-shaped valley, and the concave-convex surface 31 where P = D may be formed. 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 (the concave portion 33 in this case) = 0.1 to 2.0 mm. It can be formed to be 1.0 mm. The protrusions 32 may be arranged in any manner in the uneven surface 31. For example, the projections 32 may be formed in a regular arrangement such as a lattice or a concentric circle in a plan view of the uneven surface 31, and conversely, in an irregular arrangement. May be. Further, the plurality of protrusions 32 may have the same shape or the same size as each other, and conversely, at least one protrusion 32 has a shape or size different from the other protrusions 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-noble metal body 20 and the second joint surface 25 between the non-noble metal body 20 and the noble metal layer 30 are both uneven. . Such a configuration mainly results from a manufacturing process of the contact member 1 described later. However, the first bonding surface 15 and the second bonding surface 25 having irregularities can be formed irrespective 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 one-side surface of the rubber-like elastic body 10 are joined to each other at the uneven surface. Then, another uneven surface is formed on the other end of the non-noble metal body 20, and a noble metal layer 30 is coated thereon.

(1) Rubber-Like Elastic Body The rubber-like elastic body 10 may be a natural rubber, a synthetic rubber, or even a synthetic resin as long as it is an elastically deformable material, that is, a so-called elastomer. Preferred materials for the rubber-like elastic body 10 include thermosetting elastomers such as silicone rubber, urethane rubber, isoprene rubber, ethylene propylene rubber, natural rubber, ethylene propylene diene rubber, nitrile rubber (NBR) and styrene butadiene rubber (SBR); It includes urethane-based, ester-based, styrene-based, olefin-based, butadiene-based, and fluorine-based thermoplastic elastomers, and 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. May be a polygonal plate or a member having the shape of a polygonal column.

(2) Non-noble metal body The non-noble 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 mainly include a noble metal. ), Zinc (Zn), tin (Sn), tungsten (W), stainless steel (SUS), or any alloy thereof. As an example of the non-noble metal body 20, an alloy mainly composed of Cu, Ni, and Zn (an alloy referred to as so-called "white metal") is more suitably configured. Also, after forming a base plating layer (a plating layer mainly composed of Ni) on the surface of the non-noble metal body 20 (for example, Cu or nickel silver), the following noble metal layer 30 can be formed. As a suitable metal constituting the base plating layer, an alloy containing Cu, Zn, Sn, Cr, Ni and Ag can be exemplified. In the case where nickel white is used as the non-noble metal body 20, Zn is added to the nickel white surface. , Cu, and Cr are preferably formed, and more preferably, the base plating layer is formed of an alloy containing Ni, Ag, and Sn (Ag is not a 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. The non-noble metal body 20 has a disk shape smaller in thickness than the diameter like the rubber-like elastic body 10, but may have a form other than the disk.

(3) Noble metal layer The noble metal layer 30 is made 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 to plastically deform, and easy to form a thin film, for example, more preferably made of Au. Pd-Ni alloys (alloys in which a small amount of Ni is added to Pd), as well as hard gold plating obtained by adding cobalt (Co) or Ni to Au, can be suitably exemplified.

  FIG. 3 shows a situation where the noble metal layer of the contact member contacts the 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 matter M (which is not insulative or insulative) and hinders the electrical connection between the contact member 1 and the contact 41 is formed on the contact 41. When there is a foreign substance having a higher electrical resistance than the conductive contact), 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 concave portion 33. This is because the plurality of projections 32 formed on the uneven surface 31 of the noble metal layer 30 have a hemispherical shape, and can make point contact with the contact 41. When the foreign matter M is sandwiched between the contact 41 and the convex portion 32 near the top of the convex portion 32, the foreign material M is forcibly moved to the concave portion 33 as shown by the arrow in the upper part of FIG. As a result, the projection 32 and the contact 41 are easily electrically connected. The protrusion 32 is formed by a curved surface protruding in the direction of the contact point 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 41. Note that the general size of the foreign matter M here is a size that fits inside the concave portion 33.

(2nd Embodiment)
Next, a contact member according to a second embodiment will be described. In addition, about the part common to 1st Embodiment, duplication description may be abbreviate | omitted.

  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 FIG. 1 (1B), and a convex part and a plane part existing at the tip in the plan view are distinguishably shown. (4B) is shown.

  The contact member 1a according to the second embodiment differs 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 the other portions are common. The plurality of protrusions 32 forming the uneven surface 31 are protrusions projecting outward and having a flat end. The area (S1) of the plane portion 32a is smaller than the area (S2) of the region excluding the area (S1) of the plane 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 an area in plan view, and is, for example, a projection area (or projection area) of a target portion (the uneven surface 31, the concave portion 33, and the like) when projecting the contact members 1 and 1a onto the circuit board 40. May also be referred to). The projection 32 has a flat portion 32a at its tip, so that it can make surface contact with the contact point 41.

  In FIG. 4, the concave portion 33 which is a flat surface is shown in white, the flat portion 32 a (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 in black point dispersion. The curved surface (C) is a portion that is easily guided to the concave portion 33 when coming into contact with the foreign matter M. The plane portion 32 a (F) is a region where the foreign matter M may be sandwiched between the foreign matter M and the contact 41. The total area (S1) of the black plane (F) is less than 50% of the plane projection area (S) of the uneven surface 31, that is, the plane projection area of the curved surface (C) and the concave portion 33. By making S1 smaller than (= S2), even when one foreign matter M having a size that can be accommodated in the concave portion 33 exists in the uneven surface 31, the probability of a conduction failure to the contact 41 being less than 50%. Therefore, the object of reducing the number can be achieved.

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

  As shown in FIG. 5, the interval P between the convex portions 32 (the distance between the in-plane centers of the planar portions 32a, 32a) is preferably larger than the bottom diameter D of the convex portions 32. In addition, as described later, the concave portion 33 may be a line-shaped valley, and the uneven surface 31 of P = D may be formed. As in 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 projection 32 from the flat surface (the depression 33 in this case). = 0.1 to 1.0 mm.

(Modification)
FIG. 6 is a sectional view of Modification Example 1 (6A) and Modification Example 2 (6B) of the contact member of FIG. The first and second modifications can also be applied to a contact member 1a shown in FIG.

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

  The contact member 1c according to the modification 2 has a concave portion 33c. Part or all of the concave portion 33c has a valley shape that is depressed linearly toward the non-noble metal body 20 side. In FIG. 6 (6B), the entire recess 33c has a linear trough shape. Therefore, the interval P between the protrusions 32 is the bottom diameter D of the protrusions 32. Except for the shape of the concave portion 33c, the contact member 1 is the same as the contact member 1 described above.

  As in the first and second modifications, even when the shapes of the concave portions 33b and 33c are different from the shape (flat surface) of the concave portion 33, the tip of the convex portion 32 has a convex curved surface or a small shape as in the second embodiment. By making the surface flat, the foreign matter M can be easily guided to the concave portions 33b and 33c, and poor conduction with the contact 41 can be less likely to occur.

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

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

  As an example of a method for manufacturing the contact member, as shown in FIG. 7 (7A), a noble metal layer forming step (S110) of forming a noble metal layer 30 as a conductive contact on the surface of the non-noble metal body 20; A joining step (S120) for joining the elastic member 20 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. And a punching step (S140) for punching out the outer shape of the contact member 1. If it is not necessary to reduce the size of the contact member 1, S140 can be omitted. The same applies to the flow shown in FIG. 7 (7B) below.

  Another example of the method of manufacturing the contact member includes, as shown in FIG. 7 (7B), a joining step (S100) of joining the non-noble metal body 20 and the rubber-like elastic body 10; Next, a noble metal layer forming step (S110) of forming a 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, A pressing step (S130) of pressing the surface to form the uneven surface 31 and a punching step (S140) of punching out the outer shape of the contact member 1 are included.

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

(1) Noble 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-noble metal body 20. In this step, a non-noble metal body 50 with a noble metal layer is obtained (see a1). The method of forming the noble metal layer 30 includes plating (either electrolytic plating or electroless plating is possible), vapor deposition, sputtering, CVD, application of a solvent containing a noble metal (any of brush coating, spraying, etc. is possible), and an ink jet method. And the like, and in particular, 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. Here, the non-precious metal body 20 is a part of the non-precious metal body 50 with a precious metal layer. By performing this step, a joined body 51 having a three-layer structure of the rubber-like elastic body 10, the non-precious metal body 20, and the precious metal layer 30 is obtained (see a2).

(3) Pressing process (S130)
In this step, a mold 62 for forming the uneven surface 31 on the noble metal layer 30 is pressed on the surface of the noble metal layer 30 to form the uneven surface 31. The mold 62 is, more specifically, a convex mold called a punch. In this step, the joined body 51 is placed inside the concave mold 60 so that the noble metal layer 30 faces upward, and the mold 62 is placed in the space 61 above the joined body 51. , 62 are clamped. An uneven surface 63 capable of forming the uneven surface 31 is formed on a surface of the mold 62 that contacts the joined body 51 (see a3).

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

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

  Note that 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 a jig 80 having a plurality of through holes 81 is provided with a same number of shaft portions 86 as the number of through holes 81. The plurality of contact members 1 can be punched out of the molded body 70 by pushing the provided punch 85.

  As long as the method of manufacturing the contact member has at least the pressing step (S130), another step is not necessarily required. For example, when forming the uneven surface 31 at one end of a conductive contact having excellent conductivity, it is not necessary to form the noble metal layer 30 on the surface of the non-noble metal body 20. Further, there is no need to join the rubber-like elastic body 10 to the non-noble metal body 20. The manufacturing method described above can be applied not only to the contact member 1 but also to the contact members 1a, 1b, and 1c.

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

  FIG. 9 is a longitudinal sectional view of a member for a push button switch including the contact member of FIG.

  As shown in FIG. 9, the push button switch member 90 is disposed on the circuit board 40 and reciprocates reciprocally in the direction of the circuit board 40 (downward in FIG. 9) and in the opposite direction (upward in FIG. 9). It is a movable member. The push button switch member 90 preferably includes a substantially rectangular parallelepiped or substantially columnar key top 91, a dome portion 93 connected to the key top 91 in a skirt shape in the radial direction, and a radially outer side of the dome portion 93. And a flange 94 fixed to the circuit board 40. The key top 91 includes a lower protruding portion 92 protruding in the direction of the circuit board 40 on a lower surface facing the circuit board 40. The circuit board 40 includes a plurality of contact points 41 in a non-contact state at a position facing the downward projecting portion 92. On the other hand, the downward projecting portion 92 includes the contact member 1 at a position which is a tip thereof and can contact the contacts 41, 41. The contact member 1 is joined to the downward projecting portion 92 so that the uneven surface 31 faces the contacts 41, 41. The joining method may include any method such as bonding, heat sealing, fitting, screwing, and the like.

  When the key top 91 is not pressed from above, 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, the dome portion 93 is rapidly deformed (buckled), and the contact member 1 comes into contact with the contacts 41, 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 pressing on the key top 91 is released, the dome portion 93 returns to its original shape by its own elastic force, and the key top 91 rises. As a result, the contact member 1 is separated from the contacts 41, 41.

  In this embodiment, the push button switch member 90 is a member integrally formed of a rubber material. However, the push button switch member 90 is not a member integrally formed of a rubber material, but may be formed of any material as long as at least only the dome portion 93 is formed of a rubber material. As the rubber material constituting the push button switch member 90, thermosetting 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) is used. It is preferable to use a urethane-based, ester-based, styrene-based, olefin-based, butadiene-based, fluorine-based, or other thermoplastic elastomer, or a composite thereof. Among the above material candidates, silicone rubber is particularly preferable. Further, the shape of the dome portion 93 may be an inverted bowl shape projecting outward or a reverse fan shape projecting inside the dome portion 93 in a longitudinal sectional view. Further, the dome portion 93 may be a member having any shape such as a truncated cone or a truncated pyramid.

4. Other Embodiments Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and can be implemented with various modifications.

  For example, a member provided with a layer having excellent conductivity other than a noble metal may be used for the conductive contact. For example, a conductive contact made of aluminum or tungsten may be used. The non-noble metal body 20 and the rubber-like elastic body 10 may not be provided in this order on the surface opposite to the uneven surface 31 of the conductive contact, but only the non-noble metal body 20 and only the rubber-like elastic body 10 may be provided. Further, only the conductive contact may be used as the contact member 1.

  A plurality of constituent elements of each of the above-described embodiments can be freely combined except in a case where they cannot be combined with each other. For example, the push button switch member 90 may include the contact member 1a, the contact member 1b, or the contact member 1c.

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

1, 1a, 1b, 1c: contact member, 10: rubber-like elastic body, 15: first joining surface, 20: non-precious metal body, 25: second joining surface, 30 ..Layer of precious metal (one example of conductive contact), 31: uneven surface, 32: convex portion, 32a: flat portion, 62: mold, 90: for push button switch Member, S1... Plane area, S... Conductive contact plane projection area, S2... Plane area area excluding area.

Claims (8)

Equipped with a conductive contact having an uneven surface at one end,
The plurality of convex portions constituting the uneven surface are projecting outward, and are convex portions having a curved surface or a flat end,
A contact member wherein, when the tip has the plane portion, an area of the plane portion is smaller than an area of a region excluding an area of the plane portion from a plane projection area of the conductive contact.   The contact member according to claim 1, wherein the conductive contact is a layer of a noble metal.   The contact member according to claim 2, further comprising a non-noble metal body and a rubber-like elastic body in that order on a surface of the noble metal layer opposite to the convex portion.   4. The contact member according to claim 3, wherein a first joint surface between the rubber-like elastic body and the non-noble metal body and a second joint surface between the non-noble metal body and the noble metal layer are both uneven. It is a method of manufacturing the contact member according to any one of claims 1 to 4,
A method for manufacturing a contact member, comprising a pressing step of pressing a mold for forming an uneven surface on a conductive contact on the surface of the conductive contact to form the uneven surface. Prior to the pressing step,
A noble metal layer forming step of forming a noble metal layer as the conductive contact on the surface of the non-noble metal body,
A joining step of joining the non-precious metal body and the rubber-like elastic body,
6. The method for manufacturing a contact member according to claim 5, further comprising:   The method for manufacturing a contact member according to claim 5, further comprising a punching step of punching an outer shape of the contact member after the pressing step. A member for a push button switch comprising the contact member according to any one of claims 1 to 4.