WO2009123252A1 - Contact, commutateur de touche utilisant le contact, et son procédé de fabrication - Google Patents

Contact, commutateur de touche utilisant le contact, et son procédé de fabrication Download PDF

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Publication number
WO2009123252A1
WO2009123252A1 PCT/JP2009/056784 JP2009056784W WO2009123252A1 WO 2009123252 A1 WO2009123252 A1 WO 2009123252A1 JP 2009056784 W JP2009056784 W JP 2009056784W WO 2009123252 A1 WO2009123252 A1 WO 2009123252A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
silicone rubber
key switch
nonwoven fabric
metal fiber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2009/056784
Other languages
English (en)
Japanese (ja)
Inventor
前田孝一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
COVAC Co Ltd
Original Assignee
COVAC Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by COVAC Co Ltd filed Critical COVAC Co Ltd
Priority to JP2010505966A priority Critical patent/JPWO2009123252A1/ja
Publication of WO2009123252A1 publication Critical patent/WO2009123252A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/029—Composite material comprising conducting material dispersed in an elastic support or binding material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00—Form of contacts
    • H01H2203/008—Wires
    • H01H2203/01—Woven wire screen
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2205/00—Movable contacts
    • H01H2205/002—Movable contacts fixed to operating part

Definitions

  • the present invention relates to a low-resistance contact and a key switch used for an on-vehicle input switch using the contact. Furthermore, the present invention relates to a method of manufacturing a key switch in which contacts can be attached to a pressing member of a key switch relatively easily.
  • FIG. 4 is a side view showing an example of the structure of a conventional key switch.
  • the key switch 20 includes a pressing member 21, a movable contact 30 provided on the pressing member 21, and a fixed contact disposed on the plate S facing the movable contact 30.
  • the pressing member 21 When the pressing member 21 is pressed, the movable contact 30 provided on the member 21 comes into contact with the fixed contact C on the substrate, and conduction is obtained.
  • silicone rubber is generally used as a material for the pressing member 21 in consideration of insulation and elasticity.
  • a primer layer 22 is generally formed to provide adhesion to the surface of the silicone rubber in order to provide a metal contact. Then, a metal thin plate contact is bonded and fixed on the primer layer 22. This metal thin plate contact is made by punching into a predetermined shape after applying nickel plating 24 on the white 23, and further applying gold plating 25. Thus, many processes are required to fabricate metal sheet contacts.
  • contacts other than the above-described metal thin plate contacts have also been proposed (see, for example, Japanese Utility Model Laid-Open Nos. 566-166066, JP2003-86043 and JP1-1238423).
  • the contact proposed in Japanese Utility Model 5 6— 1 6 66 1 6 uses carbon fiber.
  • the contact proposed in Japanese Patent Laid-Open No. 20 0 3-8 6 0 4 3 is obtained by embedding a metal linear body at a predetermined pitch in a conductive insulator.
  • the contact proposed in Japanese Patent Laid-Open No. 11-2 3 8 4 2 3 is composed of a laminate of silicone rubber and conductive nonwoven fabric.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a contact having sufficient conductivity and capable of being relatively easily attached to a pressing member of a key switch. .
  • the contact of the present invention is characterized in that a metal fiber non-woven fabric is impregnated with silicone rubber and pressed into a plate shape, and the metal fiber is exposed from the rubber surface.
  • the metal fibers are entangled throughout, a contact having high conductivity in the thickness direction and the surface direction can be manufactured.
  • it since it is made of a flexible material such as a metal fiber nonwoven fabric and silicone rubber, it has flexibility as a whole. Therefore, even if there is some unevenness on the contact on the other side, the contact is deformed according to the unevenness, so that reliable conduction is obtained.
  • the metal fiber may be gold-plated.
  • the base fiber may be non-metallic as long as it can be plated with gold.
  • the contact is often incorporated into a switch or the like after being punched.
  • the metal fiber of the metal fiber nonwoven fabric is cut at the side of the contact. If the fiber corrodes, the corrosion will only occur on the cut fiber and other It does not spread on metal fibers.
  • the conventional metal thin plate contacts do not have a cracked layer on the side of the punched section, so if corrosion starts from the side, the entire contact may spread.
  • the key switch of the present invention comprises: a pressing portion; a movable contact affixed to a part of the pressing portion; and a fixed contact disposed at a portion facing the movable contact, and the movable contact is the It is a point of contact.
  • the method for producing a contact according to the present invention includes placing a metal fiber nonwoven fabric coated with liquid silicone rubber on both sides in a press mold, and maintaining the viscosity of the silicone rubber at a state of 100 0 Pa ⁇ S or less.
  • the metal fiber nonwoven fabric is heated and compressed with the press die.
  • the viscosity of the silicone rubber decreases due to heating and begins to enter between the entangled metal fibers. Furthermore, when the pressure is applied, the silicone rubber having a low viscosity gradually enters in the thickness direction of the metal fiber nonwoven fabric and is filled between the metal fibers (silicone rubber is impregnated into the metal fiber nonwoven fabric).
  • the viscosity at this time is preferably 100 0 0 Pa ⁇ S or less, particularly preferably 2 0 0 Pa ⁇ S or less.
  • the movable contact can be produced by curing at room temperature or by curing in a state where the silicone rubber is filled between the metal fibers. Therefore, the contact can be manufactured by a relatively simple method. Furthermore, it is possible to manufacture contacts that have no physical difference between the front and back surfaces, such as conductivity and adhesion.
  • the key switch manufacturing method of the present invention is characterized in that the contact point is attached to a pressing portion of the key switch by insert molding.
  • the aforementioned contacts can be attached to a silicone rubber key switch by insert molding.
  • insert molding is performed while heating to a temperature at which one or both of the silicone rubber contained in the contacts and the silicone rubber that is the key switch material starts to react, one or both silicone rubbers will react. Then, both rubbers start to react at the interface. After that, when the heat is dissipated, the two rubbers are cured at the interface, and the silicone rubber of the key switch material and the silicone rubber contained in the contacts are bonded.
  • the work of aligning the front and back of the contact becomes unnecessary.
  • FIG. 1 is a view for explaining the structure of a key switch according to an embodiment of the present invention.
  • FIG. 1 (A) is a cross-sectional view showing the structure of the entire key switch
  • FIG. 1 (B) is a schematic view of the structure of a contact.
  • FIG. 1 (A) is a cross-sectional view showing the structure of the entire key switch
  • FIG. 1 (B) is a schematic view of the structure of a contact.
  • FIG. 2 is a diagram for explaining a method of manufacturing the key switch of FIG.
  • FIG. 3 is a photograph of a metal fiber nonwoven fabric impregnated with silicone rubber.
  • FIG. 3 (A) is a plane, and
  • FIG. 3 (B) is a cut surface.
  • FIG. 4 is a side view showing an example of the structure of a conventional key switch. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a view for explaining the structure of a key switch according to an embodiment of the present invention.
  • FIG. 1 (A) is a cross-sectional view showing the structure of the entire key switch
  • FIG. 1 (B) is a schematic view of the structure of a contact.
  • FIG. 1 is a view for explaining the structure of a key switch according to an embodiment of the present invention.
  • FIG. 1 (A) is a cross-sectional view showing the structure of the entire key switch
  • FIG. 1 (B) is a schematic view of the structure of a contact.
  • the key switch 1 includes a pressing member (pressing portion) 2 and a movable contact 10 provided on the pressing member 2.
  • a fixed contact C On the substrate S facing the movable contact 10, a fixed contact C is provided.
  • the pressing member 2 is made of silicone rubber, and the operating part 2 a to be pressed, the supporting part 2 b fixed to the substrate S, and the diagonally downward direction connecting the operating part 2 a to the supporting part 2 b. And a skirt portion (bending portion) 2 c formed so as to overhang.
  • a movable contact 10 is provided on the lower surface of the operating part 2a (details will be described later).
  • the movable contact 10 is Metal fibers (for example, stainless steel, titanium, nickel, copper, etc.) 1 1 are not woven, but are intertwined into a sheet (metal fiber nonwoven fabric) that is impregnated with silicone rubber 1 2 and compressed. Alternatively, a metal fiber plated with gold may be entangled into a sheet shape. Silicone rubber 1 2 exists between the entangled metal fibers 1 1, and the metal fibers 1 1 are exposed at various places on the surface. Since the metal fibers 11 are intertwined throughout, they have conductivity in the thickness direction and the surface direction.
  • Metal fibers for example, stainless steel, titanium, nickel, copper, etc.
  • this metal contact can be affixed to the silicone rubber working part by insert molding without primer treatment, making it easier than the conventional method. Can be manufactured. At this time, there is no physical difference in conductivity and adhesiveness between the front and back of the contact, so there is no need to align the front and back of the contact.
  • the corrosion only occurs on the cut fiber and does not spread to other metal fibers.
  • the conventional thin metal plate contact does not have a flaking layer on the side surface, so when corrosion starts from the side surface, it may spread throughout.
  • FIG. 2 is a diagram for explaining a method of manufacturing the key switch of FIG.
  • a metal fiber nonwoven fabric is prepared (S 1).
  • a metal fiber plated with gold may be entangled into a sheet shape.
  • Apply silicone rubber to one or both sides of this metal fiber nonwoven fabric (S 2) and pressurize and compress from both sides.
  • S 3) Upon heating, the viscosity of the silicone rubber decreases and begins to penetrate between the intertwined metal fibers. At this time, the viscosity of the silicone rubber is lowered to 10 0 0 Pas. S, preferably 2 0 0 Pas ⁇ S or less.
  • the low-viscosity silicone rubber gradually enters in the thickness direction of the metal fiber nonwoven fabric and fills between the metal fibers (silicone rubber is impregnated into the metal fiber nonwoven fabric). . Thereafter, heat is dissipated (S 4), and the silicone rubber is cured while being filled between the metal fibers.
  • This silicone rubber impregnated nonwoven fabric is punched into a movable contact shape (S 5). Thereby, a movable contact is produced (S 6). Then, this movable contact is loaded into an insert molding die. There is no need to face each other because the contacts are not front and back. Then, insert rubber molding is performed by injecting silicone rubber, which is the material of the pressing member (S 7).
  • a metal fiber nonwoven fabric manufactured by Bekato Toko Co., Ltd.
  • This metal fiber non-woven fabric uses nickel fiber as the metal fiber, has a thickness of 0.4 mm, and a fiber diameter of 10 to 15 jum.
  • silicone rubber KE-1310 ST (trade name), manufactured by Shin-Etsu Chemical Co., Ltd.
  • This silicone rubber has a viscosity of 80 Pa ⁇ S.
  • the metal fiber nonwoven fabric coated with the silicone rubber was compressed with a temperature-controllable press die.
  • the heating temperature was 110-130 ° C
  • the applied pressure was 200 kgf / c
  • the pressing time was 5-10 minutes.
  • the mold was opened, and the metal fiber nonwoven fabric impregnated with silicon corn rubber was allowed to stand at room temperature for 10 minutes or longer.
  • Metal fiber after molding The electrical conductivity in the surface direction of the nonwoven fabric was 1 ⁇ or less. This conductivity was obtained by the following method.
  • the movable electrode is fabricated by stamping the formed metal nonwoven fabric into a circle with a diameter of 3 mm.
  • FIG. 3 is a photograph of a metal fiber nonwoven fabric impregnated with silicone rubber.
  • FIG. 3 (A) is a plane
  • FIG. 3 (B) is a cut surface. The plane was magnified about 150 times with a stereomicroscope.
  • silicone rubber contains a red colorant to make it easier to understand the presence of silicone rubber.
  • this metallic fiber nonwoven fabric has a silver appearance with a reddish metallic luster.
  • the cross section is dotted with silicone rubber colored in red, confirming that the silicone rubber is impregnated.
  • the two surfaces are almost silver and the metal nonwoven fabric is exposed.
  • the metal fibers are also intertwined in the thickness direction.
  • the metal fiber nonwoven fabric impregnated with this silicone rubber was punched into a contact shape (for example, a circle or a rectangle) to produce a contact.
  • this contact was loaded into an insert molding machine, and silicone rubber (KE 1951 (trade name), manufactured by Shin-Etsu Chemical Co., Ltd.), which is a material of the pressing member, was injected to perform insert molding.
  • silicone rubber KE 1951 (trade name), manufactured by Shin-Etsu Chemical Co., Ltd.
  • the silicone plasticity of this silicone rubber is 2 40 after 10 minutes of re-kneading, and the specific gravity is 1.14. Molding was performed while heating to 170 ° C. The molding time was 7 minutes. Then, it was left at room temperature 2 3 ⁇ 5 ° C. As a result, the contact was adhered to the silicone rubber, which is the pressing member material.
  • a contact having advantages such as no physical difference between the front and back surfaces such as conductivity and adhesiveness, flexibility and corrosion resistance. it can.
  • the metal fiber nonwoven fabric can be made by impregnating and compressing silicone rubber, the contact manufacturing process can be simplified. Further, since this contact can be bonded to the silicone rubber pressing member by insert molding, the key switch manufacturing process can be simplified.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Contacts (AREA)
  • Dispersion Chemistry (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Push-Button Switches (AREA)
  • Manufacture Of Switches (AREA)

Abstract

L'invention porte sur un contact mobile (10), qui est fabriqué par imprégnation d'un tissu non tissé de fibres métalliques avec du caoutchouc de silicone (12). Ce contact (10) est fait de matériaux mous tels que le tissu non tissé de fibres métalliques et le caoutchouc de silicone, de telle sorte qu'il présente une souplesse dans sa globalité. Le contact (10) est déformé pour s'ajuster à l'irrégularité plus ou moins grande, s'il y en a une, sur le contact d'appariement de telle sorte qu'il peut assurer une conduction fiable. De plus, le contact (10) peut être amené à adhérer à la partie action (2a) d'un élément de poussée (1) par un procédé de moulage par insert. A cet instant, le contact (10) n'a aucune différence physique sur la conductivité ou l'adhérence entre l'avant et l'arrière, de telle sorte qu'aucune considération n'est nécessaire pour décider quel côté est exposé vers l'extérieur. En conséquence, il est possible de fournir le contact qui présente une conductivité suffisante et qui peut être amené à adhérer relativement facilement à l'élément de poussée d'un commutateur de touche.
PCT/JP2009/056784 2008-03-31 2009-03-25 Contact, commutateur de touche utilisant le contact, et son procédé de fabrication Ceased WO2009123252A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010505966A JPWO2009123252A1 (ja) 2008-03-31 2009-03-25 接点、それを用いたキースイッチ及びその製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-089375 2008-03-31
JP2008089375 2008-03-31

Publications (1)

Publication Number Publication Date
WO2009123252A1 true WO2009123252A1 (fr) 2009-10-08

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PCT/JP2009/056784 Ceased WO2009123252A1 (fr) 2008-03-31 2009-03-25 Contact, commutateur de touche utilisant le contact, et son procédé de fabrication

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JP (1) JPWO2009123252A1 (fr)
WO (1) WO2009123252A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102176341A (zh) * 2010-12-28 2011-09-07 东莞万德电子制品有限公司 一种导电橡胶及其应用
CN105489420A (zh) * 2015-12-30 2016-04-13 南通万德科技有限公司 泡沫橡胶和金属的复合物及其制备方法
JP2019532480A (ja) * 2016-08-30 2019-11-07 南通万徳科技有限公司 複合材料およびその製造方法
KR102126691B1 (ko) * 2019-04-02 2020-06-25 김상경 다공성 니켈원단을 이용한 양면 전기 접점 제조방법
US11594385B2 (en) 2020-04-28 2023-02-28 Mitsumi Electric Co., Ltd. Push switch
WO2025069775A1 (fr) * 2023-09-26 2025-04-03 中西金属工業株式会社 Joint d'étanchéité de palier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5485372U (fr) * 1977-11-30 1979-06-16
JPH11238423A (ja) * 1998-02-20 1999-08-31 Porimatec Kk 接点キースイッチおよびその製造法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5485372U (fr) * 1977-11-30 1979-06-16
JPH11238423A (ja) * 1998-02-20 1999-08-31 Porimatec Kk 接点キースイッチおよびその製造法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102176341A (zh) * 2010-12-28 2011-09-07 东莞万德电子制品有限公司 一种导电橡胶及其应用
CN105489420A (zh) * 2015-12-30 2016-04-13 南通万德科技有限公司 泡沫橡胶和金属的复合物及其制备方法
JP2019532480A (ja) * 2016-08-30 2019-11-07 南通万徳科技有限公司 複合材料およびその製造方法
KR102126691B1 (ko) * 2019-04-02 2020-06-25 김상경 다공성 니켈원단을 이용한 양면 전기 접점 제조방법
US11594385B2 (en) 2020-04-28 2023-02-28 Mitsumi Electric Co., Ltd. Push switch
US11948758B2 (en) 2020-04-28 2024-04-02 Mitsumi Electric Co., Ltd. Push switch
WO2025069775A1 (fr) * 2023-09-26 2025-04-03 中西金属工業株式会社 Joint d'étanchéité de palier

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