JP4314564B2 - How to connect electronic components and lead wires - Google Patents

How to connect electronic components and lead wires Download PDF

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Publication number
JP4314564B2
JP4314564B2 JP2003187969A JP2003187969A JP4314564B2 JP 4314564 B2 JP4314564 B2 JP 4314564B2 JP 2003187969 A JP2003187969 A JP 2003187969A JP 2003187969 A JP2003187969 A JP 2003187969A JP 4314564 B2 JP4314564 B2 JP 4314564B2
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Prior art keywords
lead wire
electrode
diameter
welding
connecting portion
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JP2005025989A (en
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一行 茂木
孝一 今井
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Okaya Electric Industry Co Ltd
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Okaya Electric Industry Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、ガス入り放電管等の電子部品における電極にリード線を好適に接続する接続方法に関する。
【０００２】
【従来の技術】
従来、ガスアレスタ、避雷器等と称されているサージ電流を吸収するためのガス入り放電管５０としては、図７に示すごとく、筒状のセラミックス等からなる絶縁材料からなる外囲器５１を挟んで銅製電極５２が相対向して配設され、この銅製電極５２の外方の中心部に銅製のリード線の端面が溶接されたものが存在している。この従来のガス入り放電管５０にあっては、直径約８ｍｍの銅製電極５２に、同じく銅製の線径約１．０ｍｍのリード線５３を通常は銀ろうを用いて抵抗溶接するのであるが、銅は熱伝導率が大きいことから、銅製電極５２の中心部にリード線５３の端面を当接させた状態で電流を通じて加熱しても、リード線５３の先端への加熱は銅製電極５２と比較して線径（断面積）も小さく熱容量が小さいことからすぐに温度上昇するのに対し、銅製電極５２の中心部へ電流を通じての加熱はすぐに熱が周囲に導出して中心部の温度が上昇しづらく、このため当接する双方部分を好適な温度に上昇させた状態で溶接することができず、所望する溶接強度を得ることが困難であった。これに対し、スポット溶接は瞬間的な電流で短時間に溶接することができるのであるが、上述した抵抗溶接による長時間溶接と比較すると溶接強度はそれほど強固ではないことから、ガス入り放電管が避雷器として用いられ１０ｋＡを超えるような大きなサージ電流が通過する際に溶接個所が損傷する恐れがあった。（例えば、特許文献１参照。）。５４は、２区間式のガス入り放電管５０における中間電極である。
【０００３】
【特許文献１】
特開昭５５−９３９９号公報
【発明が解決しようとする課題】
【０００４】
解決しようとする問題点は、熱伝導率が大きい銅を用いると熱容量が大きい電極と熱容量の小さいリード線とを抵抗溶接しても強固な接合状態が得られない点である。
【０００５】
【課題を解決するための手段】
上記課題を解決するため、本発明の電子部品とリード線の接続方法にあっては、電極にリード線の端面を抵抗溶接する接続方法において、リード線の端面が接続される電極部分には先端外径を前記リード線径よりも小径としてなる接続部を突設するとともに、前記接続部は、先端径を前記リード線径の７０％〜９０％、基端部径を前記リード線径と略同一、高さをリード線径の７０％〜９０％の円錐台形状に形成し、前記電極と前記リード線を溶接する溶接装置において、電極側の溶接電極は前記電極を保持し、リード線側の溶接電極は前記リード線の突出量を前記接続部の容量とほぼ同一に保持し、前記接続部と前記リード線先端とを当接させた状態で前記溶接電極に給電して溶接することを特徴とするものである。
【０００６】
電極側の溶接電極は電極の外周を保持し、リード線側の溶接電極は前記接続部の容量とほぼ同一の容量のリード線を突出させて狭持してなることを特徴とするものである。
【０００７】
接続部は、リード線の先端径を前記リード線径の８０％、基端部径を前記リード線径と同一、高さをリード線径の８０％の円錐台形状に形成してなることを特徴とするものである。
【０００８】
【発明の実施の形態】
図１は、本発明の接続方法により接続された電子部品１を示すものであり、２区間式のガス入り放電管を例にとり以下に説明する。２はセラミックス等の絶縁材料からなる２つの筒状の外囲器、３は外囲器２の両端に配置された略円錐台形状の無酸素銅製のサイド電極、４は２つの外囲器２の間に介在する同じく銅製の中間電極、５はサイド電極３の外方中央部及び中間電極４に接続される軟銅線からなるリード線である。外囲器２の内部では、サイド電極３と中間電極４とが放電間隙を設けて対向し、その放電空間には放電ガスが封入されている。
【０００９】
図２に示すごとく、直径約８ｍｍのサイド電極３の外方中央部には、凹部６を設けるとともに、凹部６の中央部分にはリード線５を接続するための円錐台形状の接続部７を突設している。この接続部７の形状は、リード線５の直径を約１．０ｍｍとしたときに、その先端径をリード線径の７０〜９０％の０．７〜０．９ｍｍ、その基端部径をリード線径と同じ約１．０ｍｍ、その高さをリード線径の７０〜９０％の０．７〜０．９ｍｍとするものであり、特に好ましくは先端径をリード線径の８０％の０．８ｍｍ、その基端部径をリード線径と同じ約１．０ｍｍ、その高さをリード線径の８０％の０．８ｍｍとするものである。このようにサイド電極３の接続部７を上記寸法の円錐台形状とすることで、リード線５との接合部分の電流密度が増すとともに熱容量が小さくなり、これにより溶接時に温度が上昇しやすくなって溶接性の向上、溶接強度の確保が図られるものである。
【００１０】
図３は、サイド電極３の接続部７へのリード線５の溶接を抵抗溶接の溶接装置で行う際に、その溶接電極の使用法を示している。リード線側の溶接電極８はリード線５を保持し、サイド電極３側の溶接電極９はサイド電極３の外周を保持し、サイド電極３の接続部７にリード線５の先端を当接させ押圧した状態で、溶接電極８と溶接電極９の間に給電して接合部分を加熱し溶接するのであるが、溶接電極８が狭持するリード線５の突出量を、上述したサイド電極３の接続部７の容量（体積）とほぼ同一になるように０．８〜０．８５ｍｍに設定するものである。このように接合部である接続部７と溶接電極８から突出するリード線５との温度上昇のバランス（ヒートバランス）が平衡することで、抵抗溶接時に接続部７とリード線５とが同様の溶け具合となって強固で好適な溶接状態が得られるものである。
【００１１】
また中間電極４に溶接するリード線５は、図４に示すごとく、先端が鋭角な切断刃１０（刃の一方面を片刃状に、刃先以外をほぼ真っ直ぐに揃えるようにしている）で上下から狭持圧接されて切断されることで、切断面に稜部１１を突出形成している。この稜部１１は、図５に示すごとく、その縦の幅径が線径の約３０％、その高さが線径の約１０％、そして稜部１１のリード線５中心からの変位量が線径の約１０％となるようにしている。
【００１２】
そして溶接装置を用いて中間電極４にリード線５を抵抗溶接するに際しては、図６に示すごとく、リード線側の溶接電極１２がリード線５の突出寸法をリード線径より小さい約０．９ｍｍに設定して狭持するとともに、中間電極４側の溶接電極１３が中間電極４の外周を保持し、稜部１１を横向きにし中間電極４外周面と線接触するようにして当接させ、中間電極４外周にリード線５の稜部１１を押圧した状態で溶接電極１２と溶接電極１３の間に抵抗溶接の電流を流すものである。このように中間電極４に対する稜部１１の当接面積は線接触であることから小さく、接合部分の電流密度が増すことで熱容量が小さくなるとともに、溶接電極１２から突出しているリード線５と中間電極４の接合部分との温度上昇のバランス（ヒートバランス）が平衡することで、リード線５と中間電極４とが高温となって同様の溶け具合となることにより強固で好適な溶接状態が得られる。
【００１３】
尚、この中間電極４とリード線５との溶接に際し、リード線５として錫等のメッキしたものを用いた場合には、銅とメッキの錫等とが中間電極４と共晶化することでより接合されやすくなるので好ましく、さらに中間電極４にも錫等のメッキを施すと更に一層接合が容易となる。このメッキ厚は、切断刃１０による切断時に稜部１１以外のフラット面にメッキが延びるように１０〜１４μｍ程度の厚さにすることが好ましい。
【００１４】
【発明の効果】
以上詳述した如く、本発明の電子部品とリード線の接続方法によれば、電極にリード線の端面を抵抗溶接する接続方法において、リード線の端面が接続される電極部分には先端外径を前記リード線径よりも小径としその基端部外径をリード線径とほぼ同一としかつ高さが前記リード線径よりも小さい接続部を突設するとともに、前記電極とリード線を溶接する溶接装置におけるリード線を保持して給電する溶接電極からの前記リード線の突出量を前記接続部の容量とほぼ同一として溶接することで、接続部と溶接電極から突出するリード線との温度上昇のバランス（ヒートバランス）が平衡し、これにより抵抗溶接時に接続部とリード線とが同様の溶け具合となって強固で好適な溶接状態が得られるものである。
【００１５】
また接続部を、先端外径をリード線径よりも小径としその基端部外径をリード線径とほぼ同一としかつ高さが前記リード線径よりも小さい円錐台形状とすることで、電極の接続部先端にリード線端面を当接して抵抗溶接する際に、接続部先端はリード線の線径よりも小径で断面積も小さく、かつ接続部の体積が小さい（熱容量が小さい）ことから電流通過による発熱が即時的に大きく得られるとともに、接続部先端に生じる加熱は電極本体に導出しづらくなり、これにより電極の接続部とリード線の接合部分はさらに一層温度上昇しやすくなって溶接性が向上する。
【図面の簡単な説明】
【００１６】
【図１】本発明の接続方法により接続された電子部品を示す断面図である。
【図２】本発明の電子部品のサイド電極を示し、（ａ）は正面図、（ｂ）は側断面図である。
【図３】本発明の電子部品におけるサイド電極の接続部にリード線を溶接する状態を示す説明図である。
【図４】本発明の電子部品における中間電極に溶接するリード線を切断する状態を示す説明図である。
【図５】本発明の電子部品における中間電極に溶接するリード線端面を示す説明図である。
【図６】本発明の電子部品における中間電極の接合部にリード線を溶接する状態を示し、（ａ）は正面図、（ｂ）は側面図である。
【図７】従来の電子部品を示す断面図である。
【符号の説明】
【００１７】
１：電子部品
２：外囲器
３：サイド電極
４：中間電極
５：リード線
６：凹部
７：接続部
８：溶接電極
９：溶接電極
１０：切断刃
１１：稜部
１２：溶接電極
１３：溶接電極[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection method for suitably connecting a lead wire to an electrode in an electronic component such as a gas discharge tube.
[0002]
[Prior art]
Conventionally, as shown in FIG. 7, a gas discharge tube 50 for absorbing a surge current called a gas arrester or a lightning arrester sandwiches an envelope 51 made of an insulating material made of cylindrical ceramics or the like. The copper electrodes 52 are arranged opposite to each other, and an end portion of a copper lead wire is welded to the outer central portion of the copper electrode 52. In the conventional gas-filled discharge tube 50, a lead wire 53 having a copper wire diameter of approximately 1.0 mm is usually resistance-welded to a copper electrode 52 having a diameter of approximately 8 mm using a silver solder. Since copper has a high thermal conductivity, heating to the tip of the lead wire 53 is compared with the copper electrode 52 even if the lead wire 53 is heated through a current with the end face of the lead wire 53 in contact with the center of the copper electrode 52. However, while the wire diameter (cross-sectional area) is small and the heat capacity is small, the temperature immediately rises. On the other hand, the heating through the current to the center of the copper electrode 52 immediately brings the heat to the surroundings and the temperature of the center is reduced. Therefore, it is difficult to perform welding in a state where both portions in contact with each other are raised to a suitable temperature, and it is difficult to obtain a desired welding strength. In contrast, spot welding can be performed in a short time with an instantaneous current, but the welding strength is not so strong as compared to the long-time welding by resistance welding described above. When a large surge current exceeding 10 kA that is used as a lightning arrester passes, there is a possibility that the welded portion may be damaged. (For example, refer to Patent Document 1). Reference numeral 54 denotes an intermediate electrode in the two-section gas-filled discharge tube 50.
[0003]
[Patent Document 1]
JP 55-9399 A [Problems to be Solved by the Invention]
[0004]
The problem to be solved is that when copper having a high thermal conductivity is used, a strong bonding state cannot be obtained even if resistance welding is performed on an electrode having a large heat capacity and a lead wire having a small heat capacity.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the method for connecting an electronic component and a lead wire according to the present invention, in the connection method for resistance welding the end surface of the lead wire to the electrode, the tip of the electrode portion to which the end surface of the lead wire is connected A connecting portion having an outer diameter smaller than the lead wire diameter protrudes, and the connecting portion has a distal end diameter of 70% to 90% of the lead wire diameter and a proximal end portion diameter substantially equal to the lead wire diameter. In the welding apparatus in which the same height is formed in a truncated cone shape of 70% to 90% of the lead wire diameter, and the electrode and the lead wire are welded, the welding electrode on the electrode side holds the electrode, and the lead wire side The welding electrode is configured to hold the amount of protrusion of the lead wire substantially the same as the capacity of the connection portion, and to feed and weld the welding electrode with the connection portion and the lead wire tip in contact with each other. It is a feature.
[0006]
The welding electrode on the electrode side holds the outer periphery of the electrode, and the welding electrode on the lead wire side is formed by projecting and holding a lead wire having a capacity substantially the same as the capacity of the connecting portion. .
[0007]
The connecting portion is formed in a truncated cone shape in which the tip end diameter of the lead wire is 80% of the lead wire diameter, the base end portion diameter is the same as the lead wire diameter, and the height is 80% of the lead wire diameter. It is a feature.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an electronic component 1 connected by the connection method of the present invention, and will be described below by taking a two-section gas-filled discharge tube as an example. Reference numeral 2 denotes two cylindrical envelopes made of an insulating material such as ceramics, 3 denotes a substantially frustoconical oxygen-free copper side electrode disposed at both ends of the envelope 2, and 4 denotes two envelopes 2 Similarly, intermediate copper electrodes 5 and 5 are lead wires made of annealed copper wires connected to the outer central portion of the side electrode 3 and the intermediate electrode 4. Inside the envelope 2, the side electrode 3 and the intermediate electrode 4 face each other with a discharge gap, and a discharge gas is sealed in the discharge space.
[0009]
As shown in FIG. 2, a concave portion 6 is provided in the outer central portion of the side electrode 3 having a diameter of about 8 mm, and a truncated cone-shaped connecting portion 7 for connecting the lead wire 5 is provided in the central portion of the concave portion 6. It is protruding. The shape of the connecting portion 7 is such that when the diameter of the lead wire 5 is about 1.0 mm, the tip diameter is 0.7 to 0.9 mm which is 70 to 90% of the lead wire diameter, and the base end portion diameter is The lead wire diameter is about 1.0 mm, and the height is 0.7 to 0.9 mm which is 70 to 90% of the lead wire diameter, and the tip diameter is particularly preferably 0 to 80% of the lead wire diameter. .8 mm, its base end diameter is about 1.0 mm, which is the same as the lead wire diameter, and its height is 0.8 mm which is 80% of the lead wire diameter. Thus, by making the connection part 7 of the side electrode 3 into the truncated cone shape having the above-mentioned dimensions, the current density at the joint portion with the lead wire 5 is increased and the heat capacity is reduced, thereby making it easy to increase the temperature during welding. As a result, weldability is improved and welding strength is ensured.
[0010]
FIG. 3 shows how to use the welding electrode when the lead wire 5 is welded to the connecting portion 7 of the side electrode 3 by a resistance welding apparatus. The welding electrode 8 on the lead wire side holds the lead wire 5, the welding electrode 9 on the side electrode 3 side holds the outer periphery of the side electrode 3, and the tip of the lead wire 5 is brought into contact with the connection portion 7 of the side electrode 3. In the pressed state, power is supplied between the welding electrode 8 and the welding electrode 9 to heat and weld the joint portion. The protruding amount of the lead wire 5 held by the welding electrode 8 is determined by the amount of the side electrode 3 described above. It is set to 0.8 to 0.85 mm so as to be almost the same as the capacity (volume) of the connecting portion 7. In this way, the balance (heat balance) of the temperature rise between the connecting portion 7 that is a joint portion and the lead wire 5 protruding from the welding electrode 8 is balanced, so that the connecting portion 7 and the lead wire 5 are the same during resistance welding. As a result of melting, a strong and suitable welded state can be obtained.
[0011]
Further, as shown in FIG. 4, the lead wire 5 to be welded to the intermediate electrode 4 is cut from the top and bottom with a cutting blade 10 having a sharp tip (one side of the blade is formed as a single blade, and the other than the cutting edge is aligned substantially straight). The ridge portion 11 is formed to protrude from the cut surface by being nipped and pressed. As shown in FIG. 5, the ridge 11 has a vertical width of about 30% of the wire diameter, a height of about 10% of the wire diameter, and the displacement of the ridge 11 from the center of the lead wire 5. The wire diameter is about 10%.
[0012]
When the lead wire 5 is resistance-welded to the intermediate electrode 4 using a welding device, as shown in FIG. 6, the lead wire-side welding electrode 12 has a lead wire 5 protruding dimension of about 0.9 mm smaller than the lead wire diameter. The welding electrode 13 on the side of the intermediate electrode 4 holds the outer periphery of the intermediate electrode 4 and makes the ridge 11 face sideways so as to be in line contact with the outer peripheral surface of the intermediate electrode 4. A resistance welding current is passed between the welding electrode 12 and the welding electrode 13 with the ridge 11 of the lead wire 5 pressed against the outer periphery of the electrode 4. As described above, the contact area of the ridge 11 with respect to the intermediate electrode 4 is small because it is a line contact, and the heat capacity is reduced by increasing the current density of the joint portion, and the lead wire 5 protruding from the welding electrode 12 and the middle By balancing the temperature rise balance (heat balance) with the joint portion of the electrode 4, the lead wire 5 and the intermediate electrode 4 become high in temperature and have a similar melting condition, thereby obtaining a strong and suitable welded state. It is done.
[0013]
When the intermediate electrode 4 and the lead wire 5 are welded, when the lead wire 5 is plated with tin or the like, copper and plated tin or the like are eutectic with the intermediate electrode 4. Since it becomes easier to join, it is preferable that the intermediate electrode 4 is further plated with tin or the like, thereby further facilitating the joining. The plating thickness is preferably about 10 to 14 μm so that the plating extends to a flat surface other than the ridge 11 when cut by the cutting blade 10.
[0014]
【The invention's effect】
As described above in detail, according to the method for connecting an electronic component and a lead wire of the present invention, in the connection method of resistance welding the end surface of the lead wire to the electrode, the outer diameter of the tip is provided on the electrode portion to which the end surface of the lead wire is connected. A connecting portion having a diameter smaller than the lead wire diameter, the outer diameter of the proximal end portion being substantially the same as the lead wire diameter and having a height smaller than the lead wire diameter, and welding the electrode and the lead wire. Temperature rise between the connecting portion and the lead wire protruding from the welding electrode by welding the lead wire protruding from the welding electrode that holds and supplies the lead wire in the welding apparatus with substantially the same capacity as the connection portion. Thus, the balance (heat balance) is balanced, whereby the connection portion and the lead wire have the same melting condition during resistance welding, and a strong and preferable welding state is obtained.
[0015]
In addition, the connection portion is formed into a truncated cone shape having a distal end outer diameter smaller than the lead wire diameter and a proximal end outer diameter substantially the same as the lead wire diameter and having a height smaller than the lead wire diameter. When the end of the lead wire is brought into contact with the end of the lead wire and resistance welding is performed, the tip of the connecting portion is smaller in diameter and smaller in cross-sectional area than the lead wire, and the volume of the connecting portion is small (the heat capacity is small). Heat generated by the current passing can be obtained immediately and the heating generated at the tip of the connecting part is difficult to lead to the electrode body, which makes it easier to raise the temperature at the connecting part of the electrode and the lead wire. Improves.
[Brief description of the drawings]
[0016]
FIG. 1 is a cross-sectional view showing electronic components connected by a connection method of the present invention.
FIG. 2 shows a side electrode of an electronic component according to the present invention, where (a) is a front view and (b) is a side sectional view.
FIG. 3 is an explanatory view showing a state in which a lead wire is welded to a connection portion of a side electrode in the electronic component of the present invention.
FIG. 4 is an explanatory view showing a state in which a lead wire welded to the intermediate electrode in the electronic component of the present invention is cut.
FIG. 5 is an explanatory view showing an end face of a lead wire welded to an intermediate electrode in the electronic component of the present invention.
6A and 6B show a state in which a lead wire is welded to a joint portion of an intermediate electrode in the electronic component of the present invention, where FIG. 6A is a front view, and FIG.
FIG. 7 is a cross-sectional view showing a conventional electronic component.
[Explanation of symbols]
[0017]
1: Electronic component 2: Envelope 3: Side electrode 4: Intermediate electrode 5: Lead wire 6: Recessed portion 7: Connection portion 8: Welding electrode 9: Welding electrode 10: Cutting blade 11: Ridge portion 12: Welding electrode 13: Welding electrode

Claims (3)

電極にリード線の端面を抵抗溶接する接続方法において、リード線の端面が接続される電極部分には先端外径を前記リード線径よりも小径としてなる接続部を突設するとともに、前記接続部は、先端径を前記リード線径の７０％〜９０％、基端部径を前記リード線径と略同一、高さをリード線径の７０％〜９０％の円錐台形状に形成し、前記電極と前記リード線を溶接する溶接装置において、電極側の溶接電極は前記電極を保持し、リード線側の溶接電極は前記リード線の突出量を前記接続部の容量とほぼ同一に保持し、前記接続部と前記リード線先端とを当接させた状態で前記溶接電極に給電して溶接することを特徴とする電子部品とリード線の接続方法。 In the connection method in which the end surface of the lead wire is resistance-welded to the electrode, the electrode portion to which the end surface of the lead wire is connected is provided with a connecting portion having a tip outer diameter smaller than the lead wire diameter, and the connecting portion The tip diameter is 70% to 90% of the lead wire diameter, the base end diameter is substantially the same as the lead wire diameter, and the height is 70% to 90% of the lead wire diameter. In the welding apparatus for welding the electrode and the lead wire, the electrode-side welding electrode holds the electrode, and the lead wire-side welding electrode holds the protruding amount of the lead wire substantially the same as the capacity of the connecting portion, A method of connecting an electronic component and a lead wire, wherein the welding portion is fed with power and welded in a state where the connection portion and the lead wire tip are in contact with each other. 電極側の溶接電極は電極の外周を保持し、リード線側の溶接電極は前記接続部の容量とほぼ同一の容量のリード線を突出させて狭持してなることを特徴とする請求項１に記載の電子部品とリード線の接続方法。  2. The welding electrode on the electrode side holds the outer periphery of the electrode, and the welding electrode on the lead wire side is formed by projecting and holding a lead wire having a capacity substantially the same as the capacity of the connecting portion. The connection method of the electronic component and lead wire as described in 1. 接続部は、リード線の先端径を前記リード線径の８０％、基端部径を前記リード線径と同一、高さをリード線径の８０％の円錐台形状に形成してなることを特徴とする請求項１または請求項２に記載の電子部品とリード線の接続方法。  The connecting portion is formed in a truncated cone shape in which the tip end diameter of the lead wire is 80% of the lead wire diameter, the base end portion diameter is the same as the lead wire diameter, and the height is 80% of the lead wire diameter. 3. A method for connecting an electronic component and a lead wire according to claim 1 or 2.
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