JP4594152B2 - Discharge tube - Google Patents

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JP4594152B2
JP4594152B2 JP2005102257A JP2005102257A JP4594152B2 JP 4594152 B2 JP4594152 B2 JP 4594152B2 JP 2005102257 A JP2005102257 A JP 2005102257A JP 2005102257 A JP2005102257 A JP 2005102257A JP 4594152 B2 JP4594152 B2 JP 4594152B2
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discharge
discharge tube
magnesium oxide
cesium bromide
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JP2006286291A (en
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孝一 今井
陽一 松山
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Okaya Electric Industry Co Ltd
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Description

この発明は放電管に係り、特に、プロジェクターや自動車のメタルハライドランプ等の高圧放電ランプやガス調理器等の着火プラグに、点灯用又は着火用の定電圧を供給するためのスイッチングスパークギャップとして、或いは、サージ電圧を吸収するためのガスアレスタ(避雷管)として好適に使用できる放電管に関する。   The present invention relates to a discharge tube, in particular, as a switching spark gap for supplying a constant voltage for lighting or ignition to a high pressure discharge lamp such as a projector or a metal halide lamp of an automobile, or an ignition plug of a gas cooker, or The present invention relates to a discharge tube that can be suitably used as a gas arrester for absorbing surge voltage.

この種の放電管として、本出願人は、先に特開2003−7420号を提案した。この放電管60は、図5に示すように、両端が開口した絶縁材よりなる円筒状のケース部材62の両端開口部を、放電電極を兼ねた一対の蓋部材64,64で気密に封止することによって気密外囲器66を形成し、該気密外囲器66内に、所定の放電ガスを封入してなる。   As this type of discharge tube, the present applicant has previously proposed Japanese Patent Application Laid-Open No. 2003-7420. As shown in FIG. 5, the discharge tube 60 is hermetically sealed with a pair of lid members 64, 64 that also serve as discharge electrodes, at both ends of a cylindrical case member 62 made of an insulating material that opens at both ends. Thus, an airtight envelope 66 is formed, and a predetermined discharge gas is sealed in the airtight envelope 66.

上記蓋部材64は、気密外囲器66の中心に向けて大きく突き出た平面状の放電電極部68と、ケース部材62の端面に接する接合部70を備えており、両蓋部材64,64の放電電極部68,68間には、所定の放電間隙72が形成されている。
また、上記ケース部材62の内壁面74の円周方向に、微小放電間隙76を隔てて対向配置された一対のトリガ放電膜78,78が、複数組形成されている。一対のトリガ放電膜78,78の内、一方のトリガ放電膜78は、一方の放電電極部68と電気的に接続され、他方のトリガ放電膜78は、他方の放電電極部68と電気的に接続されている。
The lid member 64 includes a flat discharge electrode portion 68 that protrudes greatly toward the center of the hermetic envelope 66, and a joint portion 70 that contacts the end surface of the case member 62. A predetermined discharge gap 72 is formed between the discharge electrode portions 68 and 68.
A plurality of pairs of trigger discharge films 78 and 78 are formed in the circumferential direction of the inner wall surface 74 of the case member 62 so as to face each other with a minute discharge gap 76 therebetween. Of the pair of trigger discharge films 78, 78, one trigger discharge film 78 is electrically connected to one discharge electrode portion 68, and the other trigger discharge film 78 is electrically connected to the other discharge electrode portion 68. It is connected.

上記放電電極部68の表面には、放電開始電圧の安定に効果的なアルカリヨウ化物が含有された絶縁性の被膜80が形成されている。このアルカリヨウ化物としては、ヨウ化カリウム(KI)、ヨウ化ナトリウム(NaI)、ヨウ化セシウム(CsI)、ヨウ化ルビジウム(RbI)等のアルカリヨウ化物の単体又は混合物が該当する。
上記気密外囲器66内に封入する放電ガスとしては、例えば、アルゴン、ネオン、ヘリウム、キセノン等の希ガスあるいは窒素ガス等の不活性ガスの単体又は混合ガスが該当する。また、希ガスあるいは不活性ガスの単体又は混合ガスと、H等の負極性ガスとの混合ガスが該当する。
On the surface of the discharge electrode portion 68, an insulating film 80 containing an alkali iodide effective for stabilizing the discharge start voltage is formed. Examples of the alkali iodide include simple substances or mixtures of alkali iodides such as potassium iodide (KI), sodium iodide (NaI), cesium iodide (CsI), and rubidium iodide (RbI).
As the discharge gas sealed in the hermetic envelope 66, for example, a rare gas such as argon, neon, helium, xenon, or an inert gas such as nitrogen gas or a mixed gas is applicable. Also, a single or mixed gas of a rare gas or an inert gas, a mixed gas of negative polarity gas such as H 2 corresponds.

上記構成を備えた放電管60の放電電極部68,68間に、当該放電管60の放電開始電圧以上の電圧が印加されると、トリガ放電膜78,78間の微小放電間隙76に電界が集中し、これにより微小放電間隙76に電子が放出されてトリガ放電としての沿面コロナ放電が発生する。次いで、この沿面コロナ放電は、電子のプライミング効果によってグロー放電へと移行する。そして、このグロー放電が放電電極部68,68間の放電間隙72へと転移し、主放電としてのアーク放電に移行するのである。
特開2003−7420号
When a voltage equal to or higher than the discharge start voltage of the discharge tube 60 is applied between the discharge electrode portions 68, 68 of the discharge tube 60 having the above-described configuration, an electric field is generated in the minute discharge gap 76 between the trigger discharge films 78, 78. As a result, electrons are emitted into the minute discharge gap 76, and creeping corona discharge as a trigger discharge is generated. Next, the creeping corona discharge shifts to glow discharge due to an electron priming effect. Then, the glow discharge is transferred to the discharge gap 72 between the discharge electrode portions 68 and 68, and is transferred to arc discharge as the main discharge.
JP 2003-7420 A

ところで、上記放電管60の放電回数が増加すると、放電ガス中に含まれていた微量な不純ガスや気密外囲器66の封止工程で混入した不純ガスが、放電電極部68や被膜80の表面に吸着したり、或いは、放電時の衝撃により放電電極部68や被膜80がスパッタすることにより、放電電極部68や被膜80の仕事関数が変化し、その結果、初期放電開始電圧が上昇して、初期放電遅れを生じることがあった。この初期放電遅れは、特に、放電管60が暗中で使用される場合に顕著に発生していた。これは、暗中で放電管60が長時間放置されると、気密外囲器66内の放電の種火としての電子やイオンが減少するためである。
また、上記放電管60がスイッチングスパークギャップとして用いられる場合には、短い周期で繰り返し動作させた場合において、常に安定した放電開始電圧が得られる周波数特性に優れていることが求められる。
By the way, when the number of discharges of the discharge tube 60 is increased, a small amount of impure gas contained in the discharge gas or impure gas mixed in the sealing process of the hermetic envelope 66 is caused by the discharge electrode portion 68 or the coating 80. The work function of the discharge electrode portion 68 and the film 80 changes due to the adsorption on the surface or the sputtering of the discharge electrode portion 68 and the film 80 due to the impact during discharge, resulting in an increase in the initial discharge start voltage. As a result, an initial discharge delay may occur. This initial discharge delay is particularly noticeable when the discharge tube 60 is used in the dark. This is because, when the discharge tube 60 is left in the dark for a long time, electrons and ions as a seed of discharge in the hermetic envelope 66 are reduced.
Further, when the discharge tube 60 is used as a switching spark gap, it is required to have excellent frequency characteristics that can always provide a stable discharge start voltage when the discharge tube 60 is repeatedly operated in a short cycle.

この発明は、従来の上記問題に鑑みてなされたものであり、その目的とするところは、初期放電遅れを抑制することができると共に、周波数特性に優れた放電管を実現することにある。   The present invention has been made in view of the above-described problems, and an object of the present invention is to realize a discharge tube that can suppress an initial discharge delay and is excellent in frequency characteristics.

本発明者らは、放電電極の表面に形成する被膜の構成材料について種々検討を試みた結果、臭化セシウム(CsBr)と酸化マグネシウム(MgO)の混合物で被膜を構成した場合に、初期放電開始電圧の上昇を効果的に防止できると共に、周波数特性にも優れた放電管を実現できることを見出し、本発明を完成するに至ったものである。
すなわち、本発明に係る放電型サージ吸収素子は、複数の放電電極を放電間隙を隔てて配置すると共に、これを放電ガスと共に気密外囲器内に封入してなる放電管において、上記放電電極の表面に、臭化セシウムと酸化マグネシウムの混合物が含有された被膜を形成して成り、上記臭化セシウムと酸化マグネシウムの混合割合を、臭化セシウムが20〜80重量%、酸化マグネシウムが80〜20重量%と成したことを特徴とする。
As a result of various investigations on the constituent material of the coating film formed on the surface of the discharge electrode, the present inventors started initial discharge when the coating film was composed of a mixture of cesium bromide (CsBr) and magnesium oxide (MgO). The inventors have found that a discharge tube that can effectively prevent an increase in voltage and that has excellent frequency characteristics can be realized, and has completed the present invention.
That is, the discharge type surge absorbing element according to the present invention is a discharge tube in which a plurality of discharge electrodes are arranged with a discharge gap and sealed together with a discharge gas in an airtight envelope. A coating film containing a mixture of cesium bromide and magnesium oxide is formed on the surface, and the mixing ratio of the cesium bromide and magnesium oxide is 20 to 80 wt% for cesium bromide and 80 to 20 for magnesium oxide. It is characterized by the fact that it is formed by weight% .

本発明に係る放電管にあっては、放電電極の表面に、臭化セシウムと酸化マグネシウムの混合物が含有された被膜を形成し、上記臭化セシウムと酸化マグネシウムの混合割合を、臭化セシウムが20〜80重量%、酸化マグネシウムが80〜20重量%と成したことにより、初期放電開始電圧の上昇を防止でき、初期放電遅れを抑制することができると共に、周波数特性に優れた放電管を実現することができる。 In the discharge tube according to the present invention, a coating film containing a mixture of cesium bromide and magnesium oxide is formed on the surface of the discharge electrode, and the mixing ratio of the cesium bromide and magnesium oxide is determined as follows: 20 to 80% by weight and magnesium oxide 80 to 20% by weight make it possible to prevent an increase in the initial discharge start voltage, suppress the initial discharge delay, and realize a discharge tube with excellent frequency characteristics. can do.

本発明に係る放電管10は、図1及び図2に示すように、両端が開口した絶縁材としてのセラミックよりなる円筒状のケース部材12の両端開口部を、放電電極を兼ねた一対の蓋部材14,14で気密に封止することによって気密外囲器16を形成してなる。   As shown in FIGS. 1 and 2, a discharge tube 10 according to the present invention includes a pair of lids that serve as discharge electrodes at both ends of a cylindrical case member 12 made of ceramic as an insulating material having both ends open. The hermetic envelope 16 is formed by hermetically sealing with the members 14 and 14.

上記蓋部材14は、気密外囲器16の中心に向けて大きく突き出た平面状の放電電極部18と、ケース部材12の端面に接する接合部20を備えており、両蓋部材14,14の放電電極部18,18間には、所定の放電間隙22が形成されている。
放電電極部18と接合部20を備えた上記蓋部材14は、無酸素銅や、無酸素銅にジルコニウム(Zr)を含有させたジルコニウム銅で構成されている。尚、ケース部材12の端面と蓋部材14の接合部20とは、銀ろう等のシール材(図示せず)を介して気密封止されている。
The lid member 14 includes a planar discharge electrode portion 18 projecting greatly toward the center of the hermetic envelope 16, and a joint portion 20 in contact with the end surface of the case member 12. A predetermined discharge gap 22 is formed between the discharge electrode portions 18 and 18.
The lid member 14 provided with the discharge electrode portion 18 and the joint portion 20 is made of oxygen-free copper or zirconium copper containing oxygen-free copper containing zirconium (Zr). Note that the end face of the case member 12 and the joint portion 20 of the lid member 14 are hermetically sealed through a sealing material (not shown) such as silver solder.

また、上記ケース部材12の内壁面24には、その両端が、放電電極を兼ねた上記蓋部材14,14と微小放電間隙26を隔てて配置された線状のトリガ放電膜28が複数形成されている。図1及び図2においては、トリガ放電膜28を、ケース部材12の内壁面24の円周方向に、45度間隔で8本形成した場合が例示されている。
上記トリガ放電膜28は、カーボン系材料等の導電性材料で構成されている。このトリガ放電膜28は、例えば、カーボン系材料より成る芯材を擦り付けることにより形成することができる。
In addition, a plurality of linear trigger discharge films 28 are formed on the inner wall surface 24 of the case member 12 so that both ends of the case member 12 are spaced apart from the lid members 14 and 14 that also serve as discharge electrodes and a minute discharge gap 26. ing. 1 and 2 exemplify the case where eight trigger discharge films 28 are formed at intervals of 45 degrees in the circumferential direction of the inner wall surface 24 of the case member 12.
The trigger discharge film 28 is made of a conductive material such as a carbon-based material. The trigger discharge film 28 can be formed, for example, by rubbing a core material made of a carbon-based material.

上記放電電極部18の表面には、臭化セシウム(CsBr)と酸化マグネシウム(MgO)の混合物が含有された被膜30が形成されている。
この被膜30は、臭化セシウムの粉末と酸化マグネシウムの粉末の混合物を、珪酸ナトリウム溶液と純水よりなるバインダーに添加したものを、放電電極部18表面に塗布することによって形成することができる。また、臭化セシウムの添加された上記バインダー中に、酸化マグネシウム粉末を加えて混合したものを、放電電極部18表面に塗布して形成することもできる。
この場合、臭化セシウムと酸化マグネシウムの混合割合は、臭化セシウムが20〜80重量%、酸化マグネシウムが80〜20重量%と成すのが、初期放電開始電圧の上昇を効果的に防止すると共に、周波数特性の向上を図る上で好ましい。
また、臭化セシウムと酸化マグネシウムの混合物と、バインダーとの配合割合は、臭化セシウムと酸化マグネシウムの混合物が0.01〜40重量%、バインダーが99.99〜60重量%と成される。
尚、バインダー中の珪酸ナトリウム溶液と純水との配合割合は、珪酸ナトリウム溶液が0.01〜70重量%、純水が99.99〜30重量%の配合割合で混合される。
A film 30 containing a mixture of cesium bromide (CsBr) and magnesium oxide (MgO) is formed on the surface of the discharge electrode portion 18.
The coating 30 can be formed by applying a mixture of a cesium bromide powder and a magnesium oxide powder to a binder composed of a sodium silicate solution and pure water on the surface of the discharge electrode portion 18. Alternatively, a mixture obtained by adding and mixing magnesium oxide powder in the binder to which cesium bromide has been added may be applied to the surface of the discharge electrode portion 18.
In this case, the mixing ratio of cesium bromide and magnesium oxide is such that cesium bromide is 20 to 80% by weight and magnesium oxide is 80 to 20% by weight, while effectively preventing an increase in initial discharge start voltage. This is preferable for improving the frequency characteristics.
The mixture ratio of the cesium bromide and magnesium oxide and the binder is such that the mixture of cesium bromide and magnesium oxide is 0.01 to 40% by weight and the binder is 99.99 to 60% by weight.
The mixing ratio of the sodium silicate solution and pure water in the binder is such that the sodium silicate solution is 0.01 to 70% by weight and the pure water is 99.99 to 30% by weight.

上記気密外囲器16内には、所定の放電ガスが封入されている。この放電ガスとしては、例えば、アルゴン、ネオン、ヘリウム、キセノン等の希ガスあるいは窒素ガス等の不活性ガスの単体又は混合ガスが該当する。また、希ガスあるいは不活性ガスの単体又は混合ガスと、H等の負極性ガスとの混合ガスが該当する。 A predetermined discharge gas is sealed in the hermetic envelope 16. As this discharge gas, for example, a rare gas such as argon, neon, helium, or xenon, or an inert gas such as nitrogen gas or a mixed gas is applicable. Also, a single or mixed gas of a rare gas or an inert gas, a mixed gas of negative polarity gas such as H 2 corresponds.

本発明の上記放電管10にあっては、放電電極を兼ねた上記一対の蓋部材14,14間に、当該放電管10の放電開始電圧以上の電圧が印加されると、トリガ放電膜28の両端と蓋部材14,14間の微小放電間隙26に電界が集中し、これにより微小放電間隙26に電子が放出されてトリガ放電としての沿面コロナ放電が発生する。次いで、この沿面コロナ放電は、電子のプライミング効果によってグロー放電へと移行する。そして、このグロー放電が放電電極部18,18間の放電間隙22へと転移し、主放電としてのアーク放電に移行するのである。   In the discharge tube 10 of the present invention, when a voltage equal to or higher than the discharge start voltage of the discharge tube 10 is applied between the pair of lid members 14 and 14 also serving as discharge electrodes, the trigger discharge film 28 The electric field concentrates in the minute discharge gap 26 between the both ends and the lid members 14 and 14, whereby electrons are emitted into the minute discharge gap 26 to generate creeping corona discharge as a trigger discharge. Next, this creeping corona discharge shifts to glow discharge due to an electron priming effect. Then, the glow discharge is transferred to the discharge gap 22 between the discharge electrode portions 18 and 18, and the arc discharge as the main discharge is transferred.

而して、本発明の放電管10にあっては、放電電極部18の表面に、臭化セシウムと酸化マグネシウムの混合物が含有された被膜30を形成したことにより、初期放電開始電圧の上昇を防止でき、初期放電遅れを抑制できる長寿命な放電管10を実現することができる。
すなわち、初期放電遅れは、「統計的遅れ」と「放電形成の遅れ」に起因して生じるものであり、上記「統計的遅れ」は、放電の種火となる初期電子が出現するまでの時間(初期電子の発生確率が影響するため統計学的な値となる)をいい、光電効果が得られない暗中で発生する。一方、初期電子が存在しても、放電形成においては多数の電子雪崩現象を繰り返すことによってグロー放電のような大電流の放電に成長するものであり、この成長に必要な時間を「放電形成の遅れ」という。
本発明の放電管10の被膜30中に含有された酸化マグネシウムは、仕事関数が低く電子を放出しやすいことから、気密外囲器16内に放電の種火となる初期電子を素早く大量に供給できるため、上記統計的遅れを防止でき、その結果、初期放電遅れを抑制できるのである。
また、酸化マグネシウムは、耐スパッタ性に優れているため、スパッタされた被膜30の構成材料が、トリガ放電膜28に付着・堆積する量が減少することも、初期放電遅れの抑制に寄与している。
尚、初期放電開始電圧は、放電管を繰り返し動作させた場合における初回の放電開始電圧のことをいい、この初期放電開始電圧に続く2回目以降の放電開始電圧を追随放電開始電圧という。
Thus, in the discharge tube 10 of the present invention, the coating 30 containing a mixture of cesium bromide and magnesium oxide is formed on the surface of the discharge electrode portion 18, thereby increasing the initial discharge start voltage. Thus, a long-life discharge tube 10 that can prevent the initial discharge delay can be realized.
In other words, the initial discharge delay is caused by “statistical delay” and “discharge formation delay”, and the above “statistical delay” is the time until the appearance of the initial electrons that become the seed of discharge. (It becomes a statistical value because the generation probability of initial electrons is affected.) It occurs in the dark where the photoelectric effect cannot be obtained. On the other hand, even in the presence of initial electrons, a large number of electron avalanche phenomena are repeated in the discharge formation to grow into a large current discharge such as a glow discharge. It is called “delay”.
Magnesium oxide contained in the coating 30 of the discharge tube 10 of the present invention has a low work function and easily emits electrons, so that a large amount of initial electrons serving as a spark of discharge is quickly supplied into the hermetic envelope 16. Therefore, the statistical delay can be prevented, and as a result, the initial discharge delay can be suppressed.
In addition, since magnesium oxide is excellent in spatter resistance, the amount of the constituent material of the sputtered coating 30 adhering to and depositing on the trigger discharge film 28 also contributes to the suppression of the initial discharge delay. Yes.
The initial discharge start voltage refers to the first discharge start voltage when the discharge tube is repeatedly operated, and the second and subsequent discharge start voltages subsequent to the initial discharge start voltage are referred to as follow-up discharge start voltages.

図3は、臭化セシウムと酸化マグネシウムの混合物が含有された被膜30を放電電極部18の表面に形成して成る本発明の放電管10と、比較例としてヨウ化カリウム(KI)の含有された被膜80を放電電極部68の表面に形成した従来の放電管60、さらに比較例として臭化セシウムのみを含有する被膜を放電電極部の表面に形成した放電管における、暗中での放電回数と初期放電開始電圧との関係を示すグラフである。これら放電管は、何れも放電開始電圧が800Vに設定されているものを用いており、この場合、初期放電開始電圧が1000Vを越えると使用に適さないものとなる。
尚、本発明の放電管10は、臭化セシウムの粉末2g、酸化マグネシウムの粉末2gの混合物をバインダー20g(珪酸ナトリウム溶液12g+純水8g)に添加したものを、放電電極部18表面に塗布して被膜30を形成した。従って、この場合の臭化セシウムと酸化マグネシウムの混合割合は、臭化セシウムが50重量%、酸化マグネシウムが50重量%、すなわち重量比で1:1と成されている。
また、臭化セシウムと酸化マグネシウムの混合物(4g)と、バインダー(20g)との配合割合は、重量比で1:5と成されている。
図3のグラフに示される通り、従来の放電管60の場合(図3のグラフB)には、放電回数が約10万回程度で初期放電開始電圧が1000Vを越えて使用に適さなくなっている。また、臭化セシウムのみを含有する被膜を放電電極部の表面に形成した放電管の場合(図3のグラフC)は、従来の放電管60よりは初期放電開始電圧の上昇は抑制できるものの、初期放電開始電圧は徐々に上昇し、放電回数が約45万回程度で初期放電開始電圧が1000Vを越えて使用に適さなくなっている。
これに対し、本発明の放電管10の場合(図3のグラフA)には、放電回数が50万回となっても初期放電開始電圧が殆ど一定であり、従って暗中においても放電遅れを生じることがなく長寿命化が実現されている。
FIG. 3 shows a discharge tube 10 of the present invention in which a coating 30 containing a mixture of cesium bromide and magnesium oxide is formed on the surface of the discharge electrode portion 18, and potassium iodide (KI) as a comparative example. The number of discharges in the dark in the conventional discharge tube 60 in which the coating film 80 is formed on the surface of the discharge electrode portion 68, and in the discharge tube in which the coating film containing only cesium bromide is formed on the surface of the discharge electrode portion as a comparative example. It is a graph which shows the relationship with an initial stage discharge start voltage. Any of these discharge tubes is used in which the discharge start voltage is set to 800 V. In this case, if the initial discharge start voltage exceeds 1000 V, it becomes unsuitable for use.
The discharge tube 10 of the present invention was prepared by applying a mixture of 2 g of cesium bromide powder and 2 g of magnesium oxide powder to a binder 20 g (sodium silicate solution 12 g + pure water 8 g) on the surface of the discharge electrode portion 18. Thus, a coating 30 was formed. Therefore, the mixing ratio of cesium bromide and magnesium oxide in this case is 50% by weight for cesium bromide and 50% by weight for magnesium oxide, that is, 1: 1 by weight.
The blending ratio of the mixture of cesium bromide and magnesium oxide (4 g) and the binder (20 g) is 1: 5 in weight ratio.
As shown in the graph of FIG. 3, in the case of the conventional discharge tube 60 (graph B of FIG. 3), the number of discharges is about 100,000 times and the initial discharge start voltage exceeds 1000 V, making it unsuitable for use. . Further, in the case of a discharge tube in which a coating containing only cesium bromide is formed on the surface of the discharge electrode portion (graph C in FIG. 3), although an increase in the initial discharge start voltage can be suppressed as compared with the conventional discharge tube 60, The initial discharge start voltage gradually increases, the number of discharges is about 450,000 times, and the initial discharge start voltage exceeds 1000 V, making it unsuitable for use.
On the other hand, in the case of the discharge tube 10 of the present invention (graph A in FIG. 3), the initial discharge start voltage is almost constant even when the number of discharges reaches 500,000, and therefore a discharge delay occurs even in the dark. Long life has been achieved without any problems.

また、本発明の放電管10は、放電電極部18の表面に、臭化セシウムと酸化マグネシウムの混合物が含有された被膜30を形成したことにより、周波数特性に優れた放電管10を実現することができる。
すなわち、放電管10がスイッチングスパークギャップとして用いられる場合には、少なくとも周波数200Hz(5ms)間隔で繰り返し動作させた場合でも、安定した放電開始電圧が得られることが求められる。図4は、放電開始電圧が800Vに設定されている本発明の放電管10を、周波数200Hz(5ms)間隔で動作させた場合の放電開始電圧の推移を示すチャートであり、当該チャートに示される通り、本発明の放電管10は、放電開始電圧が常に800Vで安定しており、周波数特性に優れていることがわかる。
このように、臭化セシウムと酸化マグネシウムの混合物で被膜30を構成したことにより、周波数特性が向上するのは次の理由によるものと考えられる。すなわち、被30膜中に絶縁物(酸化物)である酸化マグネシウムを含有させることにより、規定電圧より低い電圧で放電が生成され難くなり、その結果、早期点弧や続流の発生が抑制され、短い周期で繰り返し動作させた場合においても、規定電圧(図4の場合、800V)で安定的に放電生成が可能になると考えられる。
Further, the discharge tube 10 of the present invention realizes the discharge tube 10 having excellent frequency characteristics by forming a coating 30 containing a mixture of cesium bromide and magnesium oxide on the surface of the discharge electrode portion 18. Can do.
That is, when the discharge tube 10 is used as a switching spark gap, it is required to obtain a stable discharge start voltage even when it is repeatedly operated at least at a frequency of 200 Hz (5 ms). FIG. 4 is a chart showing the transition of the discharge start voltage when the discharge tube 10 of the present invention in which the discharge start voltage is set to 800 V is operated at a frequency of 200 Hz (5 ms), and is shown in the chart. As can be seen, the discharge tube 10 of the present invention has a stable discharge start voltage of 800 V and is excellent in frequency characteristics.
As described above, it is considered that the frequency characteristics are improved by the coating 30 made of the mixture of cesium bromide and magnesium oxide for the following reason. In other words, inclusion of magnesium oxide as an insulator (oxide) in the film to be coated makes it difficult for a discharge to be generated at a voltage lower than a specified voltage, and as a result, the occurrence of early firing and continuation is suppressed. Even when the operation is repeated with a short cycle, it is considered that the discharge can be stably generated at the specified voltage (800 V in the case of FIG. 4).

本発明に係る放電管を示す概略断面図である。It is a schematic sectional drawing which shows the discharge tube which concerns on this invention. 図1のA−A概略断面図である。It is an AA schematic sectional drawing of FIG. 本発明に係る放電管と比較例の放電管における、放電回数と初期放電開始電圧との関係を示すグラフである。It is a graph which shows the relationship between the frequency | count of discharge and the initial stage discharge start voltage in the discharge tube which concerns on this invention, and the discharge tube of a comparative example. 本発明に係る放電管を、周波数200Hz(5ms)間隔で動作させた場合の放電開始電圧の推移を示すチャートである。It is a chart which shows transition of the discharge start voltage at the time of making the discharge tube which concerns on this invention operate | move by frequency 200Hz (5 ms) space | interval. 従来の放電管を示す断面図である。It is sectional drawing which shows the conventional discharge tube.

10 放電管
12 ケース部材
14 蓋部材
16 気密外囲器
18 放電電極部
22 放電間隙
26 微小放電間隙
28 トリガ放電膜
30 被膜
10 discharge tube
12 Case material
14 Lid member
16 Airtight envelope
18 Discharge electrode
22 Discharge gap
26 Micro discharge gap
28 Trigger discharge membrane
30 coating

Claims (1)

複数の放電電極を放電間隙を隔てて配置すると共に、これを放電ガスと共に気密外囲器内に封入してなる放電管において、上記放電電極の表面に、臭化セシウムと酸化マグネシウムの混合物が含有された被膜を形成して成り、上記臭化セシウムと酸化マグネシウムの混合割合を、臭化セシウムが20〜80重量%、酸化マグネシウムが80〜20重量%と成したことを特徴とする放電管。 In a discharge tube in which a plurality of discharge electrodes are arranged with a discharge gap and sealed together with a discharge gas in an airtight envelope, the surface of the discharge electrode contains a mixture of cesium bromide and magnesium oxide. A discharge tube characterized in that the mixed ratio of the cesium bromide and magnesium oxide is 20 to 80% by weight of cesium bromide and 80 to 20% by weight of magnesium oxide .
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003007420A (en) * 2001-06-22 2003-01-10 Okaya Electric Ind Co Ltd Discharge tube
JP2004079230A (en) * 2002-08-12 2004-03-11 Shinko Electric Ind Co Ltd Discharge tube and its manufacturing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003007420A (en) * 2001-06-22 2003-01-10 Okaya Electric Ind Co Ltd Discharge tube
JP2004079230A (en) * 2002-08-12 2004-03-11 Shinko Electric Ind Co Ltd Discharge tube and its manufacturing method

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