JP5218769B2 - surge absorber - Google Patents
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- JP5218769B2 JP5218769B2 JP2009038713A JP2009038713A JP5218769B2 JP 5218769 B2 JP5218769 B2 JP 5218769B2 JP 2009038713 A JP2009038713 A JP 2009038713A JP 2009038713 A JP2009038713 A JP 2009038713A JP 5218769 B2 JP5218769 B2 JP 5218769B2
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- 239000006096 absorbing agent Substances 0.000 title claims description 49
- 239000012212 insulator Substances 0.000 claims description 37
- 239000000758 substrate Substances 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 9
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- 239000007789 gas Substances 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000004044 response Effects 0.000 description 3
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- 238000004891 communication Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229910018194 SF 6 Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
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- Thermistors And Varistors (AREA)
Description
本発明は、落雷等で発生するサージから様々な機器を保護し、事故を未然に防ぐのに使用するサージアブソーバに関する。 The present invention relates to a surge absorber used for protecting various devices from a surge caused by a lightning strike or the like and preventing an accident in advance.
電話機、ファクシミリ、モデム等の通信機器用の電子機器が通信線との接続する部分、電源線、アンテナ或いはＣＲＴ駆動回路等、雷サージや静電気等の異常電圧（サージ電圧）による電撃を受けやすい部分には、異常電圧によって電子機器やこの機器を搭載するプリント基板の熱的損傷又は発火等による破壊を防止するために、サージアブソーバが接続されている。 Portions where electronic devices for communication devices such as telephones, facsimiles, modems, etc. are connected to communication lines, power lines, antennas, CRT drive circuits, etc., portions that are susceptible to electrical shock due to abnormal voltage (surge voltage) such as lightning surge or static electricity A surge absorber is connected to prevent damage due to thermal damage or ignition of an electronic device or a printed circuit board on which the device is mounted due to an abnormal voltage.
従来、応答性の良好なサージアブソーバとして、例えば特許文献１に示すように、マイクロギャップを有するサージ吸収素子を用いたサージアブソーバが提案されている。このサージアブソーバは、導電性皮膜で被包した円柱状の絶縁性部材であるセラミックス部材の周面に、いわゆるマイクロギャップが形成され、セラミックス部材の両端に一対のキャップ電極を有するサージ吸収素子が放電ガスと共にガラス管内に収容され、円筒状のガラス管の両端にリード線を有する封止電極が高温加熱で封着された放電型サージアブソーバである。 Conventionally, a surge absorber using a surge absorbing element having a micro gap has been proposed as a surge absorber having a good response, as shown in Patent Document 1, for example. In this surge absorber, a so-called microgap is formed on the peripheral surface of a ceramic member, which is a cylindrical insulating member encapsulated with a conductive film, and a surge absorbing element having a pair of cap electrodes at both ends of the ceramic member is discharged. This is a discharge type surge absorber in which sealing electrodes, which are housed in a glass tube together with gas and have lead wires at both ends of a cylindrical glass tube, are sealed by high-temperature heating.
一方、例えば特許文献２に示すように、棒状の放電基体よりなる複数の放電電極を放電間隙を隔てて対向配置し、これを放電ガスと共に気密容器内に封入し、電極基体の下端部に接続されたリード端子を気密容器外に導出した放電型サージ吸収素子において、気密容器内の誘電体基台表面にカーボン線のトリガ電極を各放電電極と微小間隙を開けて設けたカーボントリガ線式の放電型サージ吸収素子が提案されている。 On the other hand, as shown in Patent Document 2, for example, a plurality of discharge electrodes made of rod-shaped discharge bases are arranged opposite to each other with a discharge gap therebetween, and this is enclosed in an airtight container together with a discharge gas and connected to the lower end of the electrode base body. In the discharge type surge absorbing element in which the lead terminals are led out of the hermetic vessel, the carbon trigger wire type is provided with a trigger electrode of carbon wire on the surface of the dielectric base in the hermetic vessel with a small gap from each discharge electrode. Discharge type surge absorbers have been proposed.
上記従来の技術には、以下の課題が残されている。
すなわち、特許文献１に示すようなマイクロギャップ式のサージアブソーバでは、サージ吸収素子を作製するために着膜などの工程が多数必要であり、高い精度が要求されるため、製造コストが増大すると共に、小型化が難しいという不都合があった。また、特許文献２に示すようなカーボントリガ線式のサージアブソーバでは、内部にカーボンの線を描かねばならず、さらに小型化の阻害要因になっていた。特に、１．６ｍｍ×０．８ｍｍのいわゆる１６０８サイズ以下の小型化が困難であった。
The following problems remain in the conventional technology.
That is, in the microgap type surge absorber as shown in Patent Document 1, many processes such as film deposition are required to produce a surge absorbing element, and high accuracy is required. There was an inconvenience that miniaturization was difficult. Moreover, in the carbon trigger wire type surge absorber as shown in Patent Document 2, it is necessary to draw a carbon wire inside, which is an obstacle to miniaturization. In particular, it has been difficult to reduce the size of 1.6 mm × 0.8 mm, which is a so-called 1608 size or less.
本発明は、前述の課題に鑑みてなされたもので、マイクロギャップやカーボントリガ線を形成することなく、応答性が良好で低コスト化及び小型化が可能なサージアブソーバを提供することを目的とする。 The present invention has been made in view of the above-described problems, and an object thereof is to provide a surge absorber that has good responsiveness, can be reduced in cost, and can be reduced in size without forming a microgap or a carbon trigger wire. To do.
本発明は、前記課題を解決するために以下の構成を採用した。すなわち、本発明のサージアブソーバは、絶縁性基板と、該絶縁性基板上に対向状態に形成された一対の主放電電極と、前記一対の主放電電極上に配置され前記一対の主放電電極間に架設されていると共に前記絶縁性基板以上の比誘電率の材料で形成されたアーチ形状のトリガ碍子と、前記絶縁性基板上に設置されて内部空間に前記トリガ碍子を配した状態で放電ガスを封止する箱状蓋体と、を備え、前記トリガ碍子の前記主放電電極に接触する電極接触部が、凸曲面形状とされていることを特徴とする。 The present invention employs the following configuration in order to solve the above problems. That is, the surge absorber according to the present invention includes an insulating substrate, a pair of main discharge electrodes formed on the insulating substrate in a facing state, and the pair of main discharge electrodes disposed between the pair of main discharge electrodes. An arc-shaped trigger insulator formed of a material having a dielectric constant equal to or higher than that of the insulating substrate, and a discharge gas in a state where the trigger insulator is disposed on the insulating substrate and disposed in the internal space. And an electrode contact portion that contacts the main discharge electrode of the trigger insulator is formed in a convex curved surface shape.
このサージアブソーバでは、トリガ碍子の主放電電極に接触する電極接触部が、凸曲面形状とされているので、電極接触部が主放電電極にＲをもって接触することで、主放電電極と電極接触部との隙間で電界が集中してトリガ放電しやすくなり、高い応答性を得ることができる。したがって、マイクロギャップやカーボントリガ線を形成することなく、応答性が良好で低コスト化及び小型化が可能となる。また、絶縁性基板及び箱状蓋体によって全体がチップ状となり、表面実装が容易なチップ型サージアブソーバとすることができる。 In this surge absorber, since the electrode contact portion that contacts the main discharge electrode of the trigger insulator has a convex curved surface shape, the electrode contact portion contacts the main discharge electrode with an R so that the main discharge electrode and the electrode contact portion are in contact with each other. In this gap, the electric field concentrates and trigger discharge easily occurs, and high responsiveness can be obtained. Therefore, the responsiveness is good and the cost and size can be reduced without forming a microgap or a carbon trigger wire. Moreover, the whole is formed into a chip shape by the insulating substrate and the box-shaped lid, and a chip-type surge absorber that can be easily surface-mounted can be obtained.
また、本発明のサージアブソーバは、前記トリガ碍子が、前記箱状蓋体の一部で構成され前記箱状蓋体と一体化されていることを特徴とする。
すなわち、このサージアブソーバでは、トリガ碍子が、箱状蓋体の一部で構成され箱状蓋体と一体化されているので、絶縁性基板上に箱状蓋体を密着状態に接着するだけでトリガ碍子を主放電電極上に設置することができ、別体のトリガ碍子を箱状蓋体の内部空間に入れ込んで封止する場合に比べて容易に作製可能である。
The surge absorber according to the present invention is characterized in that the trigger insulator is formed of a part of the box-shaped lid and integrated with the box-shaped lid.
That is, in this surge absorber, since the trigger insulator is constituted by a part of the box-shaped lid and integrated with the box-shaped lid, it is only necessary to adhere the box-shaped lid to the insulative state on the insulating substrate. The trigger insulator can be installed on the main discharge electrode, and can be easily manufactured as compared with a case where a separate trigger insulator is inserted into the internal space of the box-shaped lid and sealed.
さらに、本発明のサージアブソーバは、前記箱状蓋体が、絶縁性材料で形成された複数の板状部材とこれら板状部材に挟まれた板状の前記トリガ碍子とが積層されて構成されていることを特徴とする。
すなわち、このサージアブソーバでは、箱状蓋体が、絶縁性材料で形成された複数の板状部材とこれら板状部材に挟まれた板状のトリガ碍子とが積層されて構成されているので、板状の各部材を積層して接着するだけでトリガ碍子を有する箱状蓋体を容易に作製することができる。
Furthermore, the surge absorber according to the present invention is configured such that the box-shaped lid is formed by laminating a plurality of plate-like members formed of an insulating material and the plate-like trigger insulator sandwiched between the plate-like members. It is characterized by.
That is, in this surge absorber, the box-shaped lid is configured by laminating a plurality of plate-like members formed of an insulating material and plate-like trigger insulators sandwiched between these plate-like members. A box-like lid having a trigger lever can be easily produced simply by laminating and adhering plate-like members.
本発明によれば、以下の効果を奏する。
すなわち、本発明に係るサージアブソーバによれば、トリガ碍子の主放電電極に接触する電極接触部が、凸曲面形状とされているので、マイクロギャップやカーボントリガ線を形成することなく、応答性が良好で低コスト化及び小型化が可能となる。また、絶縁性基板と箱状蓋体とによりチップ状となるため、表面実装が容易となる。したがって、応答性に優れかつ安価な１６０８サイズ以下の小型のチップ型サージアブソーバが可能である。
The present invention has the following effects.
That is, according to the surge absorber according to the present invention, since the electrode contact portion that contacts the main discharge electrode of the trigger insulator has a convex curved shape, the responsiveness can be achieved without forming a micro gap or a carbon trigger wire. It is good and can be reduced in cost and size. Further, since the insulating substrate and the box-like lid form a chip, surface mounting is facilitated. Therefore, a small chip-type surge absorber of 1608 size or less that is excellent in responsiveness and inexpensive is possible.
以下、本発明に係るサージアブソーバの第１実施形態を、図１から図３を参照しながら説明する。なお、以下の説明に用いる各図面では、各部材を認識可能又は認識容易な大きさとするために縮尺を適宜変更している。 Hereinafter, a first embodiment of a surge absorber according to the present invention will be described with reference to FIGS. 1 to 3. In each drawing used for the following description, the scale is appropriately changed in order to make each member recognizable or easily recognizable.
本実施形態のサージアブソーバ１は、図１から図３に示すように、絶縁性基板２と、該絶縁性基板２上に対向状態に形成された一対の主放電電極３と、一対の主放電電極３上に配置され一対の主放電電極３間に架設されていると共に絶縁性基板２以上の比誘電率の材料で形成されたアーチ形状のトリガ碍子４と、絶縁性基板２上に設置されて内部空間Ｓにトリガ碍子４を配した状態で放電ガスを封止する箱状蓋体５と、箱状蓋体５及び絶縁性基板２の両端に対向配置され主放電電極３の端部に接続された一対の端子電極６と、を備えている。 As shown in FIGS. 1 to 3, the surge absorber 1 of the present embodiment includes an insulating substrate 2, a pair of main discharge electrodes 3 formed on the insulating substrate 2 so as to face each other, and a pair of main discharges. An arch-shaped trigger insulator 4 which is disposed on the electrode 3 and is installed between the pair of main discharge electrodes 3 and which is formed of a material having a relative dielectric constant higher than that of the insulating substrate 2, and is installed on the insulating substrate 2. A box-shaped lid 5 that seals the discharge gas in a state where the trigger insulator 4 is arranged in the internal space S, and is disposed opposite to both ends of the box-shaped lid 5 and the insulating substrate 2 at the end of the main discharge electrode 3. And a pair of connected terminal electrodes 6.
上記絶縁性基板２と箱状蓋体５とは、アルミナ、ムライト、コランダムムライト等のセラミックス材料で形成されていると共に、互いにガラス接着剤（ガラスペースト）で接着されている。なお、本実施形態の絶縁性基板２と箱状蓋体５とは、アルミナで作製されている。
上記内部空間Ｓ内に封入される放電ガスは、不活性ガス等であって、例えばＨｅ，Ａｒ，Ｎｅ，Ｘｅ，Ｋｒ，ＳＦ６，ＣＯ２，Ｃ３Ｆ８，Ｃ２Ｆ６，ＣＦ４，Ｈ２，大気等及びこれらの混合ガスが採用される。
The insulating substrate 2 and the box-shaped lid 5 are formed of a ceramic material such as alumina, mullite, corundum mullite, and are bonded to each other with a glass adhesive (glass paste). Note that the insulating substrate 2 and the box-like lid 5 of the present embodiment are made of alumina.
The discharge gas sealed in the internal space S is an inert gas or the like, for example, He, Ar, Ne, Xe, Kr, SF 6 , CO 2 , C 3 F 8 , C 2 F 6 , CF 4. , H 2 , the atmosphere, etc. and a mixed gas thereof are employed.
上記主放電電極３は、例えばＡｇペースト等の導電性ペーストを絶縁性基板２上にそれぞれ長方形状にスクリーン印刷して、乾燥、焼成して形成したものである。なお、主放電電極３の基端は、絶縁性基板２の端面まで形成されて端子電極６に電気的に接続されている。 The main discharge electrode 3 is formed, for example, by screen-printing a conductive paste such as an Ag paste on the insulating substrate 2 in a rectangular shape, drying and firing. The base end of the main discharge electrode 3 is formed up to the end face of the insulating substrate 2 and is electrically connected to the terminal electrode 6.
上記一対の端子電極６は、Ａｇペースト等の導電性ペーストやＮｉめっきやはんだめっき等により形成される。例えば、互いに接合された状態の絶縁性基板２及び箱状蓋体５の両端面にＡｇペースト等の導電性ペーストを塗布して焼成することで、一対の端子電極６が形成される。 The pair of terminal electrodes 6 are formed by conductive paste such as Ag paste, Ni plating, solder plating, or the like. For example, a pair of terminal electrodes 6 is formed by applying and baking a conductive paste such as an Ag paste on both end surfaces of the insulating substrate 2 and the box-shaped lid 5 that are bonded to each other.
上記トリガ碍子４は、一対の主放電電極３に接触する一対の電極接触部４ａを有し、比誘電率（εｒ）が７〜４０００の材料で一対の主放電電極３間を橋絡されたアーチ状に形成されている。例えば、トリガ碍子４の比誘電率は、アルミナで形成された絶縁性基板２と同じでも構わないが、より高い比誘電率が良く、好ましくは２５〜８０が良い。
上記一対の電極接触部４ａは、それぞれ凸曲面形状とされている。なお、本実施形態では、電極接触部４ａが球面形状とされ、主放電電極３に点接触している。
The trigger insulator 4 has a pair of electrode contact portions 4a that are in contact with the pair of main discharge electrodes 3, and is bridged between the pair of main discharge electrodes 3 with a material having a relative dielectric constant (εr) of 7 to 4000. It is formed in an arch shape. For example, the relative permittivity of the trigger insulator 4 may be the same as that of the insulating substrate 2 made of alumina, but a higher relative permittivity is good, preferably 25-80.
Each of the pair of electrode contact portions 4a has a convex curved surface shape. In the present embodiment, the electrode contact portion 4 a has a spherical shape and is in point contact with the main discharge electrode 3.
このサージアブソーバ１では、過電圧又は過電流が侵入すると、まずトリガ碍子４の電極接触部４ａと主放電電極３との隙間でトリガ放電が行われる。すなわち、凸曲面形状の電極接触部４ａと主放電電極３の表面とがＲをもって点接触し、電極接触部４ａと主放電電極３との隙間が接触点に向けて漸次狭まっているために電界が集中することで、電極接触部４ａと主放電電極３との隙間でトリガ放電が発生する。このトリガ放電をきっかけに、さらに沿面放電が進展して一対の主放電電極３間で放電が行われることでサージが吸収される。 In this surge absorber 1, when overvoltage or overcurrent enters, trigger discharge is first performed in the gap between the electrode contact portion 4 a of the trigger insulator 4 and the main discharge electrode 3. That is, the electrode contact portion 4a having a convex curved surface and the surface of the main discharge electrode 3 are in point contact with R, and the gap between the electrode contact portion 4a and the main discharge electrode 3 is gradually narrowed toward the contact point. As a result, the trigger discharge occurs in the gap between the electrode contact portion 4a and the main discharge electrode 3. As a result of this trigger discharge, creeping discharge further develops, and discharge is performed between the pair of main discharge electrodes 3 to absorb surge.
このように本実施形態のサージアブソーバ１は、トリガ碍子４の主放電電極３に接触する電極接触部４ａが、凸曲面形状とされているので、トリガ碍子４が主放電電極３とＲをもって点接触することで、主放電電極３と電極接触部４ａとの隙間で電界が集中してトリガ放電しやすくなり、高い応答性を得ることができる。
したがって、マイクロギャップやカーボントリガ線を形成することなく、応答性が良好で低コスト化及び小型化が可能となる。また、絶縁性基板２及び箱状蓋体５によって全体がチップ状となり、表面実装が容易なチップ型サージアブソーバとすることができる。
Thus, in the surge absorber 1 of this embodiment, since the electrode contact portion 4a that contacts the main discharge electrode 3 of the trigger insulator 4 has a convex curved surface shape, the trigger insulator 4 is pointed with the main discharge electrode 3 and R. By contacting, the electric field concentrates in the gap between the main discharge electrode 3 and the electrode contact portion 4a, and trigger discharge is easily performed, and high responsiveness can be obtained.
Therefore, the responsiveness is good and the cost and size can be reduced without forming a microgap or a carbon trigger wire. Further, the insulating substrate 2 and the box-shaped lid 5 form a chip shape as a whole, and a chip-type surge absorber that can be easily surface-mounted can be obtained.
次に、本発明に係るサージアブソーバの第２実施形態を、図４から図６を参照しながら説明する。なお、以下の実施形態の説明において、上記実施形態において説明した同一の構成要素には同一の符号を付し、その説明は省略する。 Next, a second embodiment of the surge absorber according to the present invention will be described with reference to FIGS. Note that, in the following description of the embodiment, the same components described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
第２実施形態と第１実施形態との異なる点は、第１実施形態のサージアブソーバ１では、トリガ碍子４が箱状蓋体５の内部空間Ｓ内に別体の部材として収納されているのに対し、第２実施形態のサージアブソーバ２１では、図４から図６に示すように、トリガ碍子２４が、箱状蓋体２５の一部で構成され箱状蓋体２５と一体化されている点である。
すなわち、第２実施形態では、箱状蓋体２５が、絶縁性材料で形成された第１の板状部材２５Ａ及び第２の板状部材２５Ｂ（複数の板状部材）とこれらに挟まれた薄板状のトリガ碍子２４とが積層されて構成されている。
The difference between the second embodiment and the first embodiment is that, in the surge absorber 1 of the first embodiment, the trigger insulator 4 is housed in the internal space S of the box-shaped lid 5 as a separate member. On the other hand, in the surge absorber 21 of the second embodiment, as shown in FIGS. 4 to 6, the trigger insulator 24 is constituted by a part of the box-like lid 25 and is integrated with the box-like lid 25. Is a point.
That is, in the second embodiment, the box-like lid body 25 is sandwiched between the first plate-like member 25A and the second plate-like member 25B (a plurality of plate-like members) formed of an insulating material. A thin plate-like trigger insulator 24 is laminated.
上記第１の板状部材２５Ａは、箱状蓋体２５の一方の側面を構成する薄板状とされている。また、上記第２の板状部材２５Ｂは、箱状蓋体２５の他方の側面を構成すると共に第１の板状部材２５Ａよりも厚くブロック状に近い板状とされ、内側に積層時に内部空間Ｓとなる凹部が形成されている。なお、第１の板状部材２５Ａ、第２の板状部材２５Ｂ及びトリガ碍子２４とは、それぞれ互いにガラス接着剤（ガラスペースト）等で接着されている。
上記トリガ碍子２４の電極接触部２４ａは、主放電電極３に対してＲをもって線接触又は面接触する凸曲面とされている。
The first plate-like member 25 </ b> A has a thin plate shape that constitutes one side surface of the box-like lid body 25. The second plate-like member 25B constitutes the other side surface of the box-like lid 25 and is formed into a plate-like shape that is thicker than the first plate-like member 25A and close to a block shape. A recess to be S is formed. The first plate member 25A, the second plate member 25B, and the trigger insulator 24 are bonded to each other with a glass adhesive (glass paste) or the like.
The electrode contact portion 24 a of the trigger insulator 24 is a convex curved surface that makes line contact or surface contact with R with respect to the main discharge electrode 3.
このように第２実施形態のサージアブソーバ２１では、トリガ碍子２４が、箱状蓋体２５の一部で構成され箱状蓋体２５と一体化されているので、絶縁性基板２上に箱状蓋体２５を密着状態に接着するだけでトリガ碍子２４を主放電電極３上に設置することができ、別体のトリガ碍子４を箱状蓋体５の内部空間Ｓに入れ込んで封止する場合に比べて容易に作製可能である。 As described above, in the surge absorber 21 of the second embodiment, the trigger insulator 24 is constituted by a part of the box-shaped lid 25 and is integrated with the box-shaped lid 25, so that the box shape is formed on the insulating substrate 2. The trigger insulator 24 can be installed on the main discharge electrode 3 simply by adhering the lid 25 in close contact, and the separate trigger insulator 4 is inserted into the internal space S of the box-shaped lid 5 and sealed. It can be easily manufactured as compared with the case.
特に、このサージアブソーバ２１では、箱状蓋体２５が、絶縁性材料で形成された第１の板状部材２５Ａと第２の板状部材２５Ｂとに挟まれた板状のトリガ碍子２４とが積層されて構成されているので、板状の各部材を積層して接着するだけでトリガ碍子２４を有する箱状蓋体２５を容易に作製することができる。 In particular, in the surge absorber 21, the box-shaped lid 25 includes a plate-like trigger insulator 24 sandwiched between a first plate-like member 25A and a second plate-like member 25B formed of an insulating material. Since they are laminated, the box-like lid 25 having the trigger insulator 24 can be easily produced simply by laminating and adhering plate-like members.
次に、本発明に係るサージアブソーバを、上記実施形態に基づいて実際に作製した実施例により評価した結果を具体的に説明する。 Next, the result of having evaluated the surge absorber which concerns on this invention by the Example actually produced based on the said embodiment is demonstrated concretely.
上記第１実施形態のサージアブソーバであって、トリガ碍子を比誘電率（εｒ）が８．５及び８０の材料で形成した実施例１及び実施例２について、衝撃比（「インパルス放電開始電圧」／「直流放電開始電圧」）を測定した。また、上記第２実施形態のサージアブソーバであって、トリガ碍子を比誘電率（εｒ）が８０の材料で形成した実施例３について、同様に衝撃比を測定した。なお、衝撃比は１に近いほど応答性がよい。また、上記インパルスは、電圧波形１．２／５０ ５ｋＶを印加した。これらの評価結果を以下の表１に記載する。 The impact ratio (“impulse discharge start voltage”) of Example 1 and Example 2 in which the trigger insulator is formed of a material having a relative dielectric constant (εr) of 8.5 and 80, which is the surge absorber according to the first embodiment. / "DC discharge start voltage"). Further, the impact ratio of Example 3 in which the trigger insulator is formed of a material having a relative dielectric constant (εr) of 80, which is the surge absorber of the second embodiment, was measured in the same manner. The closer the impact ratio is to 1, the better the response. In addition, a voltage waveform of 1.2 / 50 5 kV was applied as the impulse. These evaluation results are listed in Table 1 below.
また、比較例１として、図７に示すように、絶縁性基板２上にマイクロギャップＧを介して対向配置された一対の放電電極３３を内部空間Ｓに配して封止した従来のマイクロギャップ式のサージアブソーバ３１を作製して、同様に評価した結果を表１に併せて記載する。
また、比較例２として、図８に示すように、一対の端子電極部材４６から対向状態に突出した一対の凸部電極部材４３を備え、絶縁性管４５の内面にカーボンで形成されたトリガ部４７が形成された従来のアレスタ型のサージアブソーバ４１を作製して、同様に評価した結果も表１に併せて記載する。
Further, as Comparative Example 1, as shown in FIG. 7, a conventional microgap in which a pair of discharge electrodes 33 arranged opposite to each other via a microgap G on an insulating substrate 2 is disposed in an internal space S and sealed. Table 1 shows the results of producing the surge absorber 31 of the formula and evaluating it in the same manner.
Further, as Comparative Example 2, as shown in FIG. 8, the trigger portion is provided with a pair of convex electrode members 43 protruding in a facing state from the pair of terminal electrode members 46 and is formed of carbon on the inner surface of the insulating tube 45. A conventional arrester type surge absorber 41 having 47 formed thereon was prepared and evaluated in the same manner.
これら評価の結果、実施例１の衝撃比が２であり、実施例２，３の衝撃比がそれぞれ１．２であった。このように、実施例１よりもトリガ碍子の比誘電率が高い実施例２，３の方が、衝撃比が１に近く、応答性が良い。また、これら実施例に対して比較例１の衝撃比は１．５、比較例２の衝撃比は４であった。このように、本発明の実施例１〜３では、マイクロギャップ式の比較例１に比べて衝撃比が同等であって、特に実施例２，３はより１に近い値であり、高速応答性を有していることがわかる。 As a result of these evaluations, the impact ratio of Example 1 was 2, and the impact ratios of Examples 2 and 3 were each 1.2. Thus, in Examples 2 and 3, where the relative permittivity of the trigger insulator is higher than that in Example 1, the impact ratio is closer to 1, and the responsiveness is better. Further, for these examples, the impact ratio of Comparative Example 1 was 1.5, and the impact ratio of Comparative Example 2 was 4. Thus, in Examples 1 to 3 of the present invention, the impact ratio is equivalent to that of Comparative Example 1 of the microgap type, and in particular, Examples 2 and 3 are values closer to 1, and high-speed response. It can be seen that
なお、本発明の技術範囲は上記各実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.
１，２１，３１，４１…サージアブソーバ、２…絶縁性基板、３…主放電電極、４，２４…トリガ碍子、４ａ，２４ａ…電極接触部、５，２５…箱状蓋体、６…端子電極、２５Ａ…第１の板状部材、２５Ｂ…第２の板状部材、Ｓ…内部空間 1, 2, 31, 41 ... Surge absorber, 2 ... Insulating substrate, 3 ... Main discharge electrode, 4, 24 ... Trigger insulator, 4a, 24a ... Electrode contact portion, 5, 25 ... Box-shaped lid, 6 ... Terminal Electrode, 25A ... first plate member, 25B ... second plate member, S ... internal space
Claims (3)
該絶縁性基板上に対向状態に形成された一対の主放電電極と、
前記一対の主放電電極上に配置され前記一対の主放電電極間に架設されていると共に前記絶縁性基板以上の比誘電率の材料で形成されたアーチ形状のトリガ碍子と、
前記絶縁性基板上に設置されて内部空間に前記トリガ碍子を配した状態で放電ガスを封止する箱状蓋体と、を備え、
前記トリガ碍子の前記主放電電極に接触する電極接触部が、凸曲面形状とされていることを特徴とするサージアブソーバ。 An insulating substrate;
A pair of main discharge electrodes formed in an opposing state on the insulating substrate;
An arch-shaped trigger insulator that is disposed on the pair of main discharge electrodes and is constructed between the pair of main discharge electrodes and formed of a material having a relative dielectric constant greater than that of the insulating substrate;
A box-like lid that is placed on the insulating substrate and seals the discharge gas in a state in which the trigger insulator is arranged in the internal space, and
A surge absorber, wherein an electrode contact portion of the trigger insulator that contacts the main discharge electrode has a convex curved surface shape.
前記トリガ碍子が、前記箱状蓋体の一部で構成され前記箱状蓋体と一体化されていることを特徴とするサージアブソーバ。 The surge absorber according to claim 1,
A surge absorber, wherein the trigger insulator is constituted by a part of the box-shaped lid and integrated with the box-shaped lid.
前記箱状蓋体が、絶縁性材料で形成された複数の板状部材とこれら板状部材に挟まれた板状の前記トリガ碍子とが積層されて構成されていることを特徴とするサージアブソーバ。 The surge absorber according to claim 2,
The surge absorber characterized in that the box-like lid is formed by laminating a plurality of plate-like members formed of an insulating material and the plate-like trigger insulator sandwiched between these plate-like members. .
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