JP2006244793A - Discharge tube - Google Patents

Discharge tube Download PDF

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JP2006244793A
JP2006244793A JP2005056806A JP2005056806A JP2006244793A JP 2006244793 A JP2006244793 A JP 2006244793A JP 2005056806 A JP2005056806 A JP 2005056806A JP 2005056806 A JP2005056806 A JP 2005056806A JP 2006244793 A JP2006244793 A JP 2006244793A
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discharge
case member
trigger
gap
gas
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Koichi Imai
孝一 今井
Yoichi Matsuyama
陽一 松山
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Okaya Electric Industry Co Ltd
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Okaya Electric Industry Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To realize a discharge tube capable of preventing peel-off of a trigger discharge film due to shock of discharge generated at a discharge gap between discharge electrodes. <P>SOLUTION: In the discharge tube 10, both-end openings of a case member 12 is sealed airtightly with a pair of lid members 14, 14 serving also as discharge electrodes to make up an airtight envelope 16, in which 16 discharge gas is sealed in, a discharge gap 22 is formed between discharge electrode parts 18, 18 of the lid members 14, 14, and a plurality of trigger discharge films 28 with both ends arranged so as to separate the lid members 14, 14 from micro discharge gaps 26 are formed on inner wall faces of the case member 12. The discharge electrode parts 18, 18 are enveloped by a ring-shape member 32 inserted into the case member 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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, and 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, this 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 starting voltage is formed. As this alkali iodide, the simple substance or mixture of alkali iodides, such as potassium iodide (KI), sodium iodide (NaI), cesium iodide (CsI), and rubidium iodide (RbI), corresponds.
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, this creeping corona discharge shifts to glow discharge due to an electron priming effect. Then, this 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

上記トリガ放電膜78は、初期電子を供給して放電遅れを防止する機能を担うために形成されているものであるが、上記放電電極部68,68間の放電間隙72で生成される放電(アーク放電)の衝撃を受けて剥離してしまい、その結果、放電遅れの防止機能が徐々に劣化していた。   The trigger discharge film 78 is formed to supply a function of preventing initial delay by supplying initial electrons, and a discharge generated in the discharge gap 72 between the discharge electrode portions 68 and 68 ( As a result, the function of preventing discharge delay gradually deteriorated.

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、その目的は、放電電極部間の放電間隙で生成される放電の衝撃によるトリガ放電膜の剥離を防止できる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 conventional problems, and an object thereof is to realize a discharge tube that can prevent the trigger discharge film from being peeled off due to the impact of discharge generated in the discharge gap between the discharge electrode portions. It is in.

上記の目的を達成するため、本発明に係る放電型サージ吸収素子は、両端が開口した絶縁材よりなるケース部材の両端開口部を、放電電極を兼ねた一対の蓋部材で気密に封止することによって気密外囲器を形成すると共に、該気密外囲器内に放電ガスを封入し、また、気密外囲器内に配置される上記蓋部材の放電電極部間に放電間隙を形成すると共に、上記ケース部材の内壁面に、その両端が上記蓋部材と微小放電間隙を隔てて配置されたトリガ放電膜を形成して成る放電管であって、上記放電電極部をケース部材内に挿入したリング状部材で囲繞したことを特徴とする。   In order to achieve the above object, the discharge type surge absorbing element according to the present invention hermetically seals both ends of a case member made of an insulating material having both ends opened with a pair of lid members also serving as discharge electrodes. Thereby forming a hermetic envelope, enclosing a discharge gas in the hermetic envelope, and forming a discharge gap between the discharge electrode portions of the lid member disposed in the hermetic envelope. A discharge tube in which a trigger discharge film is formed on the inner wall surface of the case member with both ends thereof spaced from the lid member by a minute discharge gap, and the discharge electrode portion is inserted into the case member It is characterized by being surrounded by a ring-shaped member.

本発明に係る放電管にあっては、放電電極部をケース部材内に挿入したリング状部材で囲繞したので、放電電極部間の放電間隙で生成される放電(アーク放電)の衝撃は上記リング状部材で吸収され、トリガ放電膜の剥離を防止することができる。   In the discharge tube according to the present invention, since the discharge electrode portion is surrounded by the ring-shaped member inserted in the case member, the impact of the discharge (arc discharge) generated in the discharge gap between the discharge electrode portions is the above ring. The trigger discharge film can be prevented from being peeled off by being absorbed by the shaped member.

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 a 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、初期放電開始電圧の上昇を防止する効果を奏する臭化セシウム(CsBr)とチタン(Ti)の混合物が含有された被膜30が形成されている。
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。
上記被膜30は、臭化セシウムの粉末とチタンの粉末の混合物を、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、チタン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。
尚、チタンの粉末の粒径は、例えば、10〜45μmと成される。
この場合、臭化セシウムとチタンの混合割合は、臭化セシウムが20〜80重量%、チタンが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上で好ましい。
また、臭化セシウムとチタンの混合物と、バインダーとの配合割合は、臭化セシウムとチタンの混合物が0.01〜25重量%、バインダーが99.99〜75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 titanium (Ti) that has an effect of preventing an increase in initial discharge start voltage is formed on the surface of the discharge electrode portion 18.
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.
The coating 30 can be formed by applying a mixture of a cesium bromide powder and a titanium powder to a binder composed of a sodium silicate solution and pure water on the surface of the discharge electrode portion 18. Alternatively, the binder to which cesium bromide is added and titanium powder added and mixed can be applied to the surface of the discharge electrode portion 18 to form.
The particle size of the titanium powder is, for example, 10 to 45 μm.
In this case, the mixing ratio of cesium bromide and titanium is preferably 20 to 80% by weight for cesium bromide and 80 to 20% by weight for titanium in order to effectively prevent an increase in initial discharge start voltage. .
The mixture ratio of the cesium bromide and titanium and the binder is such that the mixture of cesium bromide and titanium is 0.01 to 25% by weight and the binder is 99.99 to 75% 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.

上記一対の放電電極部18,18は、ケース部材12内に挿入されたリング状部材32で囲繞されている。この結果、放電電極部18,18は、リング状部材32で囲繞された空間36内に配置され、一方、ケース部材12の内壁面24に形成されたトリガ放電膜28は、リング状部材32外方の空間38内に配置されることとなる。
上記リング状部材32は、アルミナ等の絶縁材料で構成されており、図3及び図4に示すように、切込部34が形成されている。該切込部34は、上記リング状部材32で囲繞された放電電極部18の存在する空間36と、上記トリガ放電膜28の存在するリング状部材32外方の空間38とを連通するために設けられたものである。
The pair of discharge electrode portions 18 and 18 are surrounded by a ring-shaped member 32 inserted into the case member 12. As a result, the discharge electrode portions 18 and 18 are disposed in the space 36 surrounded by the ring-shaped member 32, while the trigger discharge film 28 formed on the inner wall surface 24 of the case member 12 is outside the ring-shaped member 32. It will be arranged in the space 38.
The ring-shaped member 32 is made of an insulating material such as alumina, and a cut portion 34 is formed as shown in FIGS. The notch 34 communicates with the space 36 where the discharge electrode 18 surrounded by the ring-shaped member 32 exists and the space 38 outside the ring-shaped member 32 where the trigger discharge film 28 exists. It is provided.

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 is performed as the main discharge.

上記の通り、リング状部材32には、該リング状部材32で囲繞された放電電極部18の存在する空間36と、上記トリガ放電膜28の存在するリング状部材32外方の空間38とを連通する切込部34が形成されているので、上記微小放電間隙26に放出された電子の流通や、沿面コロナ放電から放電間隙22におけるアーク放電への移行が阻害されることはない。   As described above, the ring-shaped member 32 includes a space 36 where the discharge electrode portion 18 surrounded by the ring-shaped member 32 exists, and a space 38 outside the ring-shaped member 32 where the trigger discharge film 28 exists. Since the communicating cut 34 is formed, the flow of electrons emitted to the minute discharge gap 26 and the transition from the creeping corona discharge to the arc discharge in the discharge gap 22 are not hindered.

本発明の放電管10は、一対の放電電極部18,18をケース部材12内に挿入したリング状部材32で囲繞したので、放電電極部18,18間の放電間隙22で生成される放電(アーク放電)の衝撃は上記リング状部材32で吸収され、トリガ放電膜28の剥離を防止することができる。   In the discharge tube 10 of the present invention, since the pair of discharge electrode portions 18 and 18 are surrounded by the ring-shaped member 32 inserted into the case member 12, the discharge generated in the discharge gap 22 between the discharge electrode portions 18 and 18 ( The arc discharge) is absorbed by the ring-shaped member 32, and the trigger discharge film 28 can be prevented from peeling off.

また、本発明の放電管10は、放電電極部18の表面に、初期放電開始電圧の上昇を防止する効果を奏する臭化セシウムとチタンの混合物が含有された被膜30を形成したことから、初期放電開始電圧の上昇を防止でき、初期放電遅れを生じることのない長寿命な放電管10を実現することができる。
本発明の放電管10の被膜30中に含有されたチタンは、イオン化傾向が極めて大きいことから、該チタンが放電ガス分子をイオン化させ、その結果、気密外囲器16内に放電の種火となるイオンを多量に供給できる。
Further, since the discharge tube 10 of the present invention formed the coating 30 containing the mixture of cesium bromide and titanium having the effect of preventing the increase of the initial discharge start voltage on the surface of the discharge electrode portion 18, the initial stage It is possible to prevent the discharge start voltage from increasing and to realize a long-life discharge tube 10 that does not cause an initial discharge delay.
Titanium contained in the coating 30 of the discharge tube 10 of the present invention has a very large ionization tendency, so that the titanium ionizes discharge gas molecules. Can be supplied in large quantities.

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. リング状部材を示す正面図である。It is a front view which shows a ring-shaped member. 図3のB−B概略断面図である。It is a BB schematic sectional drawing of FIG. 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.

符号の説明Explanation of symbols

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
32 リング状部材
34 切込部
36 空間
38 空間
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
32 Ring-shaped member
34 notch
36 space
38 space

Claims (1)

両端が開口した絶縁材よりなるケース部材の両端開口部を、放電電極を兼ねた一対の蓋部材で気密に封止することによって気密外囲器を形成すると共に、該気密外囲器内に放電ガスを封入し、また、気密外囲器内に配置される上記蓋部材の放電電極部間に放電間隙を形成すると共に、上記ケース部材の内壁面に、その両端が上記蓋部材と微小放電間隙を隔てて配置されたトリガ放電膜を形成して成る放電管であって、上記放電電極部をケース部材内に挿入したリング状部材で囲繞したことを特徴とする放電管。
An airtight envelope is formed by hermetically sealing the opening at both ends of the case member made of an insulating material with both ends open with a pair of lid members that also serve as discharge electrodes, and a discharge is generated in the airtight envelope. Gas is sealed, and a discharge gap is formed between the discharge electrode portions of the lid member disposed in the hermetic envelope, and both ends of the case member are disposed on the inner wall surface of the case member. A discharge tube formed by forming a trigger discharge film arranged at a distance from each other, wherein the discharge electrode portion is surrounded by a ring-shaped member inserted into a case member.
JP2005056806A 2005-03-02 2005-03-02 Discharge tube Pending JP2006244793A (en)

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Publications (1)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6193993U (en) * 1984-11-27 1986-06-17
JP2004311358A (en) * 2003-04-10 2004-11-04 Okaya Electric Ind Co Ltd Discharge tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6193993U (en) * 1984-11-27 1986-06-17
JP2004311358A (en) * 2003-04-10 2004-11-04 Okaya Electric Ind Co Ltd Discharge tube

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