JP2010056098A - Surface mounting discharge tube - Google Patents

Surface mounting discharge tube Download PDF

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JP2010056098A
JP2010056098A JP2009280759A JP2009280759A JP2010056098A JP 2010056098 A JP2010056098 A JP 2010056098A JP 2009280759 A JP2009280759 A JP 2009280759A JP 2009280759 A JP2009280759 A JP 2009280759A JP 2010056098 A JP2010056098 A JP 2010056098A
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discharge tube
electrode
ceramic envelope
solder
taper
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JP5036796B2 (en
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Kazuhiko Machida
和彦 町田
Kesayuki Takeuchi
今朝幸 竹内
Chisato Emori
智里 江守
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Shinko Electric Industries Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface mounting discharge tube which is capable of suppressing positional deviation at the time of soldering and has sufficient PCT property. <P>SOLUTION: The surface mounting discharge tube includes a structure in which both ends of a cylindrical ceramic envelope are sealed with sides of electrodes, respectively, and the tube is directly soldered onto a mounting board. Each electrode has rectangular portions at the both ends that are extended outward from the ends of the ceramic envelope and tapered portions or stepped portions for soldering at the peripheral edges of sides of the electrode. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、プリント回路基板上に直接はんだ接合される表面実装用放電管に関する。   The present invention relates to a surface mount discharge tube that is soldered directly onto a printed circuit board.

一般に放電管は、円筒形のセラミック外囲器の両端部を各々電極の側面で密閉した構造であり、プリント回路基板上への搭載は、従来は電極の端面に設けたリード線を介して行なわれていた。   In general, a discharge tube has a structure in which both ends of a cylindrical ceramic envelope are sealed with the side surfaces of electrodes, and mounting on a printed circuit board is conventionally performed via lead wires provided on the end surfaces of the electrodes. It was.

リード線を介した搭載は放電管一個毎に行なうが、多数個を一括して搭載したいとの要請が強くなっており、そのためにリード線を用いずに直接にプリント回路基板上に接合する表面実装が必要になってきた。   Mounting via lead wires is performed for each discharge tube, but there is a strong demand for mounting a large number of discharge tubes at the same time. For this reason, the surface to be directly bonded on the printed circuit board without using lead wires Implementation has become necessary.

その際、円筒形の放電管を単にそのままプリント回路基板上に載置すると転がってしまい位置決めが困難になるため、電極の一部に平坦部を設けること（特許文献１，２）が行なわれている。また、放電管と同一の基本構造を持つサージアブソーバにおいて、同趣旨にて電極を多角形にすること（特許文献３）が行なわれている。   At that time, if the cylindrical discharge tube is simply placed on the printed circuit board as it is, it will roll and positioning will be difficult, so a flat portion is provided on a part of the electrode (Patent Documents 1 and 2). Yes. Further, in a surge absorber having the same basic structure as the discharge tube, the electrode is made polygonal with the same purpose (Patent Document 3).

表面実装は、プリント回路基板上の各実装箇所にはんだペレットを配置し、そこに各々放電管の電極周縁部のはんだ接合用平坦部位を位置合わせして載置した状態で、加熱炉に装入してはんだペレットを溶解させた後に、炉外へ取り出してはんだを固化させ、接合を完了する。   In surface mounting, solder pellets are placed at each mounting location on the printed circuit board, and the solder joint flat portions of the electrode periphery of the discharge tube are aligned and placed in the heating furnace. Then, after the solder pellets are dissolved, the solder pellets are taken out of the furnace and solidified to complete the joining.

しかし、このように表面実装を行なった放電管は、はんだ接合時に所定実装位置に対して位置ずれが発生する上、プレッシャークッカーテスト（ＰＣＴ）特性等の信頼性が不十分であるという問題があった。   However, the discharge tube that has been surface-mounted in this manner has a problem that positional displacement occurs with respect to a predetermined mounting position at the time of solder joining, and reliability such as pressure cooker test (PCT) characteristics is insufficient. It was.

実開昭５９−３３６９０号公報（実用新案登録請求の範囲、図２〜５）Japanese Utility Model Publication No. 59-33690 (claims for registration of utility model, FIGS. 2 to 5) 特開２００３−１５１７１６号公報（特許請求の範囲、図１、３）JP 2003-151716 A (Claims, FIGS. 1 and 3) 特開２００１−１３５４５３号公報（特許請求の範囲、図３）JP 2001-135453 A (Claims, FIG. 3)

本発明は、はんだ接合時の位置ずれ発生を抑制すると共に、十分なＰＣＴ特性を備えた表面実装用放電管を提供することを目的とする。   An object of the present invention is to provide a surface-mount discharge tube that suppresses the occurrence of misalignment during solder bonding and has sufficient PCT characteristics.

上記の目的を達成するために、本発明の表面実装用放電管は、円筒形のセラミック外囲器の両端部に各電極の側面を接合することにより、該両端部を各々電極の側面で密閉した構造を備え、実装基板上に直接はんだ接合される表面実装用放電管であって、
上記両端部に接続された電極が角型であって上記セラミック外囲器の端部から外側へ該セラミック外囲器の中心軸に対して張り出しており、該セラミック外囲器と接合される側の電極側面の周縁であって、該張り出した部分の該電極側面の周縁にはんだ接合用のテーパまたは段差を備えており、
該放電管中央部の両電極の対面部で放電を行なうことを特徴とする。 In order to achieve the above object, the surface-mount discharge tube of the present invention is formed by joining the side surfaces of each electrode to both ends of a cylindrical ceramic envelope, thereby sealing the both ends with the side surfaces of the electrodes. A surface mount discharge tube that is directly soldered onto a mounting board,
The electrodes connected to the both ends are square and project outward from the end of the ceramic envelope to the central axis of the ceramic envelope and are joined to the ceramic envelope. A taper or a step for soldering at the periphery of the electrode side surface of the electrode
Discharging is performed at the facing portions of both electrodes at the center of the discharge tube.

本発明者は、両端の電極を角型とし、セラミック外囲器の端部から外側へ張り出させ、電極側面の周縁にはんだ接合用のテーパまたは段差を設けると、表面実装のためのはんだ接合時の位置ずれ発生を抑制し、同時に、十分な信頼性（特にＰＣＴ特性）を確保できることを見出して本発明を完成させた。   The inventor makes the electrodes at both ends square, projects outward from the end of the ceramic envelope, and provides a solder joint taper or step on the periphery of the electrode side surface. The present invention has been completed by finding that the occurrence of misalignment at the time can be suppressed and at the same time sufficient reliability (particularly PCT characteristics) can be secured.

更に、本発明の放電管は、リード線が不要なので、製造プロセスにおいてリード線形成のための諸工程を省けるため、生産性が向上する。   Furthermore, since the discharge tube of the present invention does not require a lead wire, the steps for forming the lead wire can be omitted in the manufacturing process, so that the productivity is improved.

図１は、本発明により電極側面にテーパを備えた放電管の一実施形態を示す（１）縦断面図および（２）横断面図である。FIG. 1 is a (1) longitudinal sectional view and (2) a transverse sectional view showing an embodiment of a discharge tube having a taper on the electrode side surface according to the present invention. 図２は、本発明により電極側面に段差を備えた放電管の一実施形態を示す（１）縦断面図および（２）横断面図である。FIG. 2 is a (1) longitudinal sectional view and (2) a transverse sectional view showing an embodiment of a discharge tube having a step on the electrode side surface according to the present invention.

〔実施形態１〕 図１に、本発明による表面実装用放電管の一例を示す。図１（１）は放電管の円筒形セラミック外囲器の中心軸を含む面で切断した縦断面図であり、図１（２）は図１（１）に示した線Ｘ−Ｘで切断した横断面図である。   Embodiment 1 FIG. 1 shows an example of a surface mount discharge tube according to the present invention. FIG. 1 (1) is a longitudinal sectional view cut along a plane including the central axis of the cylindrical ceramic envelope of the discharge tube, and FIG. 1 (2) is cut along the line XX shown in FIG. 1 (1). FIG.

図１に示した放電管１１０は、中心軸Ｃを持つ円筒形のセラミック外囲器１０２の両端部を各々円形の電極１０４の側面Ｓで密閉した構造を備えている。電極１０４は角型であってセラミック外囲器１０２の端部から中心軸Ｃに対して外側へ張り出しており、電極１０４の側面Ｓの周縁にはんだ接合用のテーパＴを備えている。   The discharge tube 110 shown in FIG. 1 has a structure in which both ends of a cylindrical ceramic envelope 102 having a central axis C are sealed with side surfaces S of circular electrodes 104. The electrode 104 has a square shape and projects outward from the end of the ceramic envelope 102 with respect to the central axis C. The electrode 104 includes a taper T for solder bonding on the periphery of the side surface S of the electrode 104.

なお、放電管中央部で両電極１０４、１０４の対面部にそれぞれ形成された多数凹部付き窪み１０６内には、放電を確実に発生させて安定に維持するための物質が塗布または充填されている。窪み１０６内の多数凹部は、図１(１）に各々半球状に示した多数の凹部である（図１（２）では省略）。   In addition, a material for reliably generating a discharge and maintaining it stably is applied or filled in the recesses 106 with a large number of recesses formed respectively on the facing portions of both electrodes 104, 104 at the center of the discharge tube. . The multiple recesses in the recess 106 are multiple recesses each shown in a hemispherical shape in FIG. 1A (not shown in FIG. 1B).

電極１０４が角型なので、表面実装時に４辺のどこでも搭載可能である。これにより、実装時に位置決め・ポッティングによる方向出しが不要である。   Since the electrode 104 is square, it can be mounted anywhere on the four sides during surface mounting. This eliminates the need for orientation by positioning and potting during mounting.

電極１０４がセラミック外囲器１０２の端部から中心軸Ｃに対して外側へ張り出しているので、プリント回路基板に搭載した際にプリント回路基板の表面と放電管１１０のセラミック外囲器１０２との間に空間が確保されるため、ＰＣＴ特性が向上する。   Since the electrode 104 projects outward from the end of the ceramic envelope 102 with respect to the central axis C, the surface of the printed circuit board and the ceramic envelope 102 of the discharge tube 110 when mounted on the printed circuit board. Since a space is secured between them, the PCT characteristics are improved.

上記空間の確保による１つの効果として、表面実装時に溶融したはんだがセラミック外囲器１０２と電極１０４との接合界面に毛細管現象で浸透することを防止でき、これにより通電時にはんだのマイグレーションによるショート不良を防止できる。   As one effect of ensuring the space, it is possible to prevent the solder melted at the time of surface mounting from penetrating into the joint interface between the ceramic envelope 102 and the electrode 104 due to a capillary phenomenon, thereby causing a short circuit failure due to migration of the solder when energized. Can be prevented.

電極１０４の側面Ｓの周縁にはんだ接合用のテーパＴを備えているので、はんだペレットを用いた表面実装時に、溶融したはんだが表面張力で電極に這い上がり易くなり、はんだ付け時の位置ずれ発生が抑制されると共に、はんだ付け強度が向上する。   Since the taper T for soldering is provided on the periphery of the side surface S of the electrode 104, when surface mounting using solder pellets, molten solder tends to crawl up to the electrode due to surface tension, and misalignment occurs during soldering. Is suppressed and the soldering strength is improved.

テーパ角度θ（図１（１）参照）は、０°＜θ＜９０°の範囲内で上記効果が得られ、特に０°＜θ＜４５°で効果が顕著であり、θ＝２５°付近で最も大きな効果が確認されている。   The taper angle θ (see FIG. 1 (1)) provides the above effect within a range of 0 ° <θ <90 °, and the effect is particularly remarkable when 0 ° <θ <45 °, and around θ = 25 °. The largest effect has been confirmed.

なお、電極１０４の外側面中央部には大きなディンプル１０８が形成してあって、放電管１１０の搬送時にチャック部として利用できると同時に、電極１０４の体積を小さく且つ表面積を大きくして放熱性を高めている。   A large dimple 108 is formed in the central portion of the outer surface of the electrode 104 and can be used as a chuck portion when the discharge tube 110 is transported. At the same time, the volume of the electrode 104 is reduced and the surface area is increased to improve heat dissipation. It is increasing.

〔実施形態２〕 図２に、本発明による表面実装用放電管の他の一例を示す。図２（１）は放電管の円筒形セラミック外囲器の中心軸を含む面で切断した縦断面図であり、図２（２）は図２（１）に示した線Ｘ−Ｘで切断した横断面図である。   Embodiment 2 FIG. 2 shows another example of a surface mount discharge tube according to the present invention. FIG. 2 (1) is a longitudinal sectional view cut along a plane including the central axis of the cylindrical ceramic envelope of the discharge tube, and FIG. 2 (2) is cut along the line XX shown in FIG. 2 (1). FIG.

図２に示した放電管１２０は、電極１０４の側面Ｓの周縁にはんだ接合用の段差Ｄを備えている点以外は、図１の放電管１１０と同じ構造である。図１の放電管と対応する箇所には共通の参照符号を付した。   The discharge tube 120 shown in FIG. 2 has the same structure as the discharge tube 110 of FIG. 1 except that the peripheral edge of the side surface S of the electrode 104 is provided with a step D for soldering. The portions corresponding to those of the discharge tube in FIG.

本実施形態の放電管１２０は、電極１０４の側面Ｓの周縁にはんだ接合用の段差Ｄを備えており、実施形態１の放電管１１０のはんだ接合用テーパＴと同様に、はんだ付け時の位置ずれ防止効果およびはんだ付け強度向上効果が得られる。はんだ接合用段差は、電極外周から測定した寸法で表すと、一般に０．１〜５ｍｍ程度が適当であり、１〜２ｍｍ程度が望ましく、はんだ接合に用いるはんだペレットの厚みよりも大きいことが望ましい。   The discharge tube 120 according to the present embodiment includes a step D for solder bonding at the periphery of the side surface S of the electrode 104, and similarly to the solder bonding taper T of the discharge tube 110 according to the first embodiment, the position at the time of soldering. A slip prevention effect and a soldering strength improvement effect are obtained. When expressed by the dimension measured from the outer periphery of the electrode, the solder joint step is generally about 0.1 to 5 mm, preferably about 1 to 2 mm, and preferably larger than the thickness of the solder pellet used for solder joining.

他の効果、すなわち実施形態１について説明した、電極１０４が角型であることによる効果、プリント回路基板の表面とセラミック外囲器１０２との間の空間確保による効果、電極１０４の外側面中央部に設けたディンプル１０８による効果も、実施形態１と同様に得られる。   Other effects, that is, the effect of the electrode 104 having a square shape, the effect of securing the space between the surface of the printed circuit board and the ceramic envelope 102, the central portion of the outer surface of the electrode 104, described in the first embodiment The effects of the dimples 108 provided in the above are also obtained in the same manner as in the first embodiment.

〔リード線形成工程の削減効果〕 電極にリード線を形成するためには、一般に下記工程（１）〜（４）が必要である。   [Reduction effect of lead wire forming step] In order to form a lead wire on an electrode, the following steps (1) to (4) are generally required.

（１）リード線スポット溶接（電極外表面の中央部にリード線を接合） （２）リード線加工（基板への接合用の脚部を形成するためのリード線曲げ加工） （３）リーク確認 （４）点火確認 本発明の放電管はリード線を用いないので上記工程（１）〜（４）を省ける。   (1) Lead wire spot welding (join the lead wire to the center of the outer surface of the electrode) (2) Lead wire processing (lead wire bending to form legs for joining to the substrate) (3) Leak check (4) Ignition confirmation Since the discharge tube of the present invention does not use lead wires, the above steps (1) to (4) can be omitted.

更に、工程（１）リード線スポット溶接は、通常１０ｋｇ加圧による抵抗溶接が標準である。しかし、この方式は放電管本体に衝撃を与えるため、セラミック外囲器と電極とを接合しているろう付け面に負荷を与えてしまい、マイクロクラックの発生により封入ガスのリークを起こす原因となる。本発明はリード線形成工程を行なわないので、このような問題が起きることがない。   Furthermore, resistance welding by 10 kg pressurization is standard for the step (1) lead wire spot welding. However, since this method gives an impact to the discharge tube main body, a load is applied to the brazing surface that joins the ceramic envelope and the electrode, which causes leakage of the sealed gas due to the occurrence of microcracks. . Since the present invention does not perform the lead wire forming step, such a problem does not occur.

なお、上記各実施形態では、電極１０４のテーパＴや段差Ｄを、電極１０４の内向き側面Ｓの周縁に設けている例を示した。しかし、はんだの這い上がりによるマイグレーションが生じない場合、内向き側面Ｓの周縁にテーパＴや段差Ｄを設けずに、電極１０４の内向き側面Ｓと反対側の外向き側面の周縁にテーパＴや段差Ｄ設けても良い。   In each of the above embodiments, the example in which the taper T and the step D of the electrode 104 are provided on the periphery of the inward side surface S of the electrode 104 has been described. However, if migration due to solder creep does not occur, the taper T and the taper T and the step D are not provided on the periphery of the inward side S, and the taper T and A step D may be provided.

また、電極１０４のテーパＴや段差Ｄを、電極１０４の内向き側面Ｓの周縁と、側面Ｓの反対側の外向き側面の周縁の両方に設けても良い。   Further, the taper T and the step D of the electrode 104 may be provided on both the periphery of the inward side surface S of the electrode 104 and the periphery of the outward side surface opposite to the side surface S.

〔実施例１〕 電極側面にテーパを付与した本発明の放電管とテーパ無しの従来の放電管とについて、はんだペレットを用いた表面実装試験を行ない、はんだ接合時の位置ずれを測定した。   [Example 1] A surface mount test using solder pellets was performed on the discharge tube of the present invention in which the side surface of the electrode was tapered and a conventional discharge tube without a taper, and the displacement during soldering was measured.

図１（１）中に示したテーパ角度θを、従来例はθ＝０°（ただし、電極張出し無（従来例１）／有（従来例２）の２種類）、本発明例はθ＝２５°、４５°、７５°の３水準とした。サンプル形状は下記のとおりであった。   The taper angle θ shown in FIG. 1 (1) is θ = 0 ° in the conventional example (however, two types of electrode overhang (conventional example 1) / existing (conventional example 2)), and in the present invention example, θ = Three levels of 25 °, 45 °, and 75 ° were set. The sample shape was as follows.

＜サンプル形状＞
セラミック外囲器 ：外径φ０．８ｍｍ×長さ６．０ｍｍ（円筒形）
電極 ：□１２．０ｍｍ、外縁部厚み２．０ｍｍ
（従来例１は□８．１ｍｍ）
プリント回路基板との間隔：２．０ｍｍ（従来例１は間隔０）
表面実装試験は下記の手順で行なった。 <Sample shape>
Ceramic envelope: Outer diameter φ0.8mm x Length 6.0mm (cylindrical)
Electrode: □ 12.0 mm, outer edge thickness 2.0 mm
(Conventional example 1 is □ 8.1 mm)
Spacing with printed circuit board: 2.0 mm (Conventional example 1 has a spacing of 0)
The surface mounting test was performed according to the following procedure.

＜表面実装試験の手順＞
（１）プリント回路基板上にはんだペレット（長さ１２．５ｍｍ、幅２．０ｍｍ、厚さ１．５ｍｍ）を載置。 <Surface mount test procedure>
(1) A solder pellet (length 12.5 mm, width 2.0 mm, thickness 1.5 mm) is placed on a printed circuit board.

（２）はんだペレット上にサンプル放電管を載せ、放電管円筒軸方向（Ｘ方向）と放電管直系方向（Ｙ方向）の初期位置を測定。   (2) A sample discharge tube is placed on the solder pellet, and the initial positions in the discharge tube cylindrical axis direction (X direction) and the discharge tube direct direction (Y direction) are measured.

（３）はんだ溶着炉に装入して３５０℃に加熱。   (3) Charge in a solder welding furnace and heat to 350 ° C.

（４）はんだ溶着炉から取り出し、常温まで冷却後に、サンプルのＸ方向位置およびＹ方向位置を測定。上記初期位置との差からはんだ接合時の位置ずれを算出。   (4) After taking out from the solder welding furnace and cooling to room temperature, the X direction position and the Y direction position of the sample are measured. Calculate the positional deviation during soldering from the difference from the initial position.

同種のサンプル５個について上記試験を行った（繰返し数：ｎ＝５）。試験結果を表１に示す。   The above test was performed on five samples of the same type (repetition number: n = 5). The test results are shown in Table 1.

Figure 2010056098
Figure 2010056098

本発明によるテーパ付きサンプルはいずれも、テーパ無しの従来例サンプルに比べて、はんだ接合時の位置ずれが大幅に低減している。   All of the tapered samples according to the present invention have significantly reduced misalignment at the time of soldering as compared with the conventional samples without taper.

従来例１はテーパ無しであって、かつ電極張出し無しでセラミックス外囲器とプリント回路基板との間に空間が無い形態であり、位置ずれが最も著しく、Ｘ方向（放電管円筒軸方向）が１．１〜３．６ｍｍ、Ｙ方向（放電管直径方向）が１．２〜３．３で、位置ずれのばらつきも大きい。   Conventional example 1 has no taper and no electrode overhang, and there is no space between the ceramic envelope and the printed circuit board. The positional deviation is most significant, and the X direction (the direction of the discharge tube cylindrical axis) is 1.1 to 3.6 mm, the Y direction (discharge tube diameter direction) is 1.2 to 3.3, and the variation in misalignment is large.

従来例２はテーパ無しであって、本発明例と同じく電極張出し有りでセラミック外囲器とプリント回路基板との間に２ｍｍの空間が確保されており、位置ずれがＸ方向１．２〜２．２ｍｍ、Ｙ方向１．３〜２．５ｍｍであり従来例１に比べると位置ずれが少なく、ばらつきも小さい。   Conventional example 2 has no taper, and as with the present invention example, with an electrode overhang, a space of 2 mm is secured between the ceramic envelope and the printed circuit board, and the positional deviation is 1.2-2 in the X direction. .2 mm, 1.3 to 2.5 mm in the Y direction, and there is less positional deviation and less variation compared to Conventional Example 1.

これに対して本発明例は、試験した範囲ではテーパ角度θ＝２５°で位置ずれが最も少なく、Ｘ方向０．１〜０．２ｍｍ、Ｙ方向０．１〜０．３ｍｍであり、従来例の１０分の１のレベルに低減している。テーパ角度θが４５°、７５°と大きくなるにしたがって、位置ずれが徐々に増加する傾向があるが、位置ずれが最も大きいテーパ角度θ＝７５°の本発明例でも、従来例の数分の１のレベルであって、Ｘ方向０．３〜０．６ｍｍ、Ｙ方向０．８〜１．１である。   On the other hand, in the example of the present invention, in the tested range, the taper angle θ = 25 ° has the smallest positional deviation, 0.1 mm to 0.2 mm in the X direction, and 0.1 mm to 0.3 mm in the Y direction. It is reduced to the level of 1/10. As the taper angle θ increases to 45 ° and 75 °, the positional deviation tends to gradually increase. However, even in the present invention example where the positional deviation is the largest, the taper angle θ = 75 ° is several minutes of the conventional example. 1 level, which is 0.3 to 0.6 mm in the X direction and 0.8 to 1.1 in the Y direction.

〔実施例２〕 電極側面にテーパを付与した本発明の放電管とテーパ無しの従来の放電管とについて、実施例１と同様にはんだペレットを用いて表面実装を行ない、実装後にプレッシャークッカーテスト（ＰＣＴ）を行なった。   [Example 2] With respect to the discharge tube of the present invention in which the electrode side surface is tapered and the conventional discharge tube without taper, surface mounting is performed using solder pellets in the same manner as in Example 1, and the pressure cooker test ( PCT).

放電管電極側面のテーパ角度θを、従来例はθ＝０°（ただし、電極張出し無（従来例１）／有（従来例２）の２種類）、本発明例はθ＝２５°、７５°の２水準とした。   The taper angle θ of the side surface of the discharge tube electrode is θ = 0 ° in the conventional example (however, there are two types of electrode overhang (conventional example 1) / existing (conventional example 2)), and the present invention example is θ = 25 °, 75 Two levels of ° were set.

放電管サンプル形状は実施例１と同様であった。   The discharge tube sample shape was the same as in Example 1.

ＰＣＴ試験は下記の条件で行なった。   The PCT test was performed under the following conditions.

＜ＰＣＴ試験条件＞
温度：１２０℃
湿度：１００％（飽和状態）
圧力：０．１５０ＭＰａ
通電：ＤＣ５００Ｖを常時印加
時間：１００時間〜８００時間（累計）
評価：合格基準（規格）／５００時間で絶縁抵抗１０００ＭΩ以上維持すること。 <PCT test conditions>
Temperature: 120 ° C
Humidity: 100% (saturated state)
Pressure: 0.150 MPa
Energization: DC500V always applied Time: 100 hours to 800 hours (cumulative)
Evaluation: To maintain an insulation resistance of 1000 MΩ or more at an acceptable standard (standard) / 500 hours.

ＰＣＴ試験後に絶縁抵抗を測定した結果を表２に示す。   The results of measuring the insulation resistance after the PCT test are shown in Table 2.

Figure 2010056098
Figure 2010056098

従来例および本発明例の全てのサンプルで、１００時間経過後までは１００００ＭΩ（測定可能上限値）以上を維持した。   In all the samples of the conventional example and the example of the present invention, 10000 MΩ (measurable upper limit value) or more was maintained until after 100 hours.

従来例１（テーパ無し、空間無し）は既に２００時間で６００ＭΩまで低下し、従来例２（テーパ無し、空間確保）は５００時間で５００ＭΩまで低下しており、いずれも合格基準に達しなかった。   Conventional Example 1 (no taper, no space) has already dropped to 600 MΩ in 200 hours, and Conventional Example 2 (no taper, space secured) has dropped to 500 MΩ in 500 hours, and none of them passed the acceptance criteria.

これに対して本発明例（テーパ有り、空間確保）は、いずれも５００時間経過後に１００００ＭΩ（測定可能上限値）以上の絶縁抵抗を維持しており合格基準の１０倍を超える優れた特性を示している。特に、テーパ角度θ＝２５°の場合は８００時間経過後もなお１００００ＭΩ以上の絶縁抵抗を維持している。テーパ角度θ＝７５°の場合も、６００時間経過後になお合格基準の７倍に相当する７０００ＭΩの絶縁抵抗を維持している。   On the other hand, the examples of the present invention (with a taper, ensuring space) maintain an insulation resistance of 10000 MΩ (measurable upper limit) or more after 500 hours, and show excellent characteristics exceeding 10 times the acceptance standard. ing. In particular, when the taper angle θ = 25 °, the insulation resistance of 10000 MΩ or more is maintained even after 800 hours. Even when the taper angle θ = 75 °, the insulation resistance of 7000 MΩ corresponding to 7 times the acceptance criterion is maintained after 600 hours.

表面実装後の観察によると、電極側面にテーパの無い従来例に特有な現象として、電極とセラミック外囲器との接合部分およびセラミック外囲器とプリント回路基板との間に気泡が残存していた。これは電極側面にテーパを付与した本発明例では観察されなかったので、従来例においては気泡の存在が絶縁劣化を促進する一因となった可能性がある。   According to the observation after the surface mounting, as a phenomenon peculiar to the conventional example in which there is no taper on the side surface of the electrode, bubbles remain between the joint portion of the electrode and the ceramic envelope and between the ceramic envelope and the printed circuit board. It was. Since this was not observed in the example of the present invention in which the side surface of the electrode was tapered, in the conventional example, the presence of bubbles may have contributed to the promotion of insulation deterioration.

本発明によれば、はんだ接合時の位置ずれ発生を抑制すると共に、十分な信頼性（特にＰＣＴ特性）を備えた表面実装用放電管が提供される。   ADVANTAGE OF THE INVENTION According to this invention, while suppressing generation | occurrence | production of position shift at the time of solder joining, the discharge tube for surface mounting provided with sufficient reliability (especially PCT characteristic) is provided.

１１０、１２０ 本発明の放電管
１０２ 円筒形のセラミック外囲器
１０４ 電極
１０６ 窪み
１０８ ディンプル
Ｃ 円筒形セラミック外囲器１０２の中心軸
Ｓ 電極１０４の側面
Ｔ 電極１０４の側面Ｓの周縁に設けたはんだ接合用テーパ
θ テーパ角度（基準は電極側面Ｓ）
Ｄ 電極１０４の側面Ｓの周縁に設けたはんだ接合用段差 110, 120 Discharge tube of the present invention 102 Cylindrical ceramic envelope 104 Electrode 106 Recess 108 Dimple C Central axis of cylindrical ceramic envelope 102 S Side surface of electrode 104 T Solder provided on peripheral edge of side surface S of electrode 104 Taper for joining θ Taper angle (reference is electrode side S)
D Step for solder joint provided on the periphery of the side surface S of the electrode 104

Claims (5)

円筒形のセラミック外囲器の両端部に各電極の側面を接合することにより、該両端部を各々電極の側面で密閉した構造を備え、実装基板上に直接はんだ接合される表面実装用放電管であって、
上記両端部に接続された電極が角型であって上記セラミック外囲器の端部から外側へ該セラミック外囲器の中心軸に対して張り出しており、該セラミック外囲器と接合される側の電極側面の周縁であって、該張り出した部分の該電極側面の周縁にはんだ接合用のテーパまたは段差を備えており、
該放電管中央部の両電極の対面部で放電を行なうことを特徴とする表面実装用放電管。 A surface-mount discharge tube that has a structure in which the side surfaces of each electrode are joined to both end portions of a cylindrical ceramic envelope so that the both end portions are sealed by the side surfaces of the electrodes, and is soldered directly onto the mounting substrate. Because
The electrodes connected to the both ends are square and project outward from the end of the ceramic envelope to the central axis of the ceramic envelope and are joined to the ceramic envelope. A taper or a step for soldering at the periphery of the electrode side surface of the electrode
A discharge tube for surface mounting, wherein discharge is performed at the facing portions of both electrodes at the center of the discharge tube. 請求項１において、上記電極側面周縁のはんだ接合用テーパは、該電極側面を基準としたテーパ角度θが０°＜θ＜９０°であることを特徴とする表面実装用放電管。   2. The surface-mount discharge tube according to claim 1, wherein a taper angle θ with respect to the electrode side surface periphery is 0 ° <θ <90 ° with respect to the electrode side surface. 請求項２において、上記テーパ角度θが０°＜θ＜４５°であることを特徴とする表面実装用放電管。   3. The surface-mount discharge tube according to claim 2, wherein the taper angle θ is 0 ° <θ <45 °. 請求項１において、上記電極側面周縁のはんだ接合用段差は、０．１〜５ｍｍであることを特徴とする表面実装用放電管。   2. The surface-mount discharge tube according to claim 1, wherein the step for solder joint at the peripheral edge of the electrode is 0.1 to 5 mm. 請求項４において、上記段差は、上記はんだ接合に用いるはんだペレットの厚みよりも大きいことを特徴とする表面実装用放電管。   5. The surface mount discharge tube according to claim 4, wherein the step is larger than a thickness of a solder pellet used for the solder joining.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61156265A (en) * 1984-12-28 1986-07-15 Canon Inc Image forming device
JPH05308179A (en) * 1992-04-08 1993-11-19 Nec Corp Mounting method for surface mounting component
JPH10335777A (en) * 1997-06-02 1998-12-18 Taiyo Yuden Co Ltd Component mounting structure
JPH11283859A (en) * 1998-03-31 1999-10-15 Aiwa Co Ltd Chip-shaped circuit part
JP2001135453A (en) * 1999-11-09 2001-05-18 Teikoku Tsushin Kogyo Co Ltd Surface mounting type surge absorber
JP2003151716A (en) * 2001-11-13 2003-05-23 Nisshin Denki Seisakusho:Kk Discharge lightning pipe
JP2004056112A (en) * 2002-05-30 2004-02-19 Matsushita Electric Ind Co Ltd Circuit component, unit packaged with circuit component, module containing circuit component, and method of manufacturing the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61156265A (en) * 1984-12-28 1986-07-15 Canon Inc Image forming device
JPH05308179A (en) * 1992-04-08 1993-11-19 Nec Corp Mounting method for surface mounting component
JPH10335777A (en) * 1997-06-02 1998-12-18 Taiyo Yuden Co Ltd Component mounting structure
JPH11283859A (en) * 1998-03-31 1999-10-15 Aiwa Co Ltd Chip-shaped circuit part
JP2001135453A (en) * 1999-11-09 2001-05-18 Teikoku Tsushin Kogyo Co Ltd Surface mounting type surge absorber
JP2003151716A (en) * 2001-11-13 2003-05-23 Nisshin Denki Seisakusho:Kk Discharge lightning pipe
JP2004056112A (en) * 2002-05-30 2004-02-19 Matsushita Electric Ind Co Ltd Circuit component, unit packaged with circuit component, module containing circuit component, and method of manufacturing the same

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