JP3133822U - Discharge tube - Google Patents

Discharge tube Download PDF

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JP3133822U
JP3133822U JP2007003400U JP2007003400U JP3133822U JP 3133822 U JP3133822 U JP 3133822U JP 2007003400 U JP2007003400 U JP 2007003400U JP 2007003400 U JP2007003400 U JP 2007003400U JP 3133822 U JP3133822 U JP 3133822U
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discharge
discharge tube
lid member
lid
tube
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孝一 今井
俊行 田中
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Okaya Electric Industry Co Ltd
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Abstract

【課題】溶接強度が高く、リード端子接続時に蓋部材の変形・破損を生じることのない放電管を実現する。
【解決手段】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で封止して気密外囲器16を形成すると共に、上記蓋部材14，14の放電電極部18，18間に放電間隙22を形成し、また、気密外囲器16内に放電ガスを封入して成る放電管10であって、上記蓋部材14の外面に凹部19を形成し、該凹部19を形成する底面15から立設する凸状のリード接続部21を形成すると共に、上記底面15の周縁に膨出リブ23を形成した。
【選択図】図７Disclosed is a discharge tube that has high welding strength and does not cause deformation or breakage of a lid member when a lead terminal is connected.
Both ends of the case member 12 are sealed with a pair of lid members 14 and 14 that also serve as discharge electrodes to form an airtight envelope 16, and the discharge electrode portions of the lid members 14 and 14 are also formed. 18 is a discharge tube 10 in which a discharge gap 22 is formed between 18 and 18, and discharge gas is sealed in an airtight envelope 16, and a recess 19 is formed on the outer surface of the lid member 14, and the recess A convex lead connecting portion 21 erected from the bottom surface 15 forming 19 was formed, and a bulging rib 23 was formed on the periphery of the bottom surface 15.
[Selection] Figure 7

Description

この考案は、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封止して形成した気密外囲器内に放電ガスを封入して成る放電管に係り、特に、上記蓋部材の外面側にリード端子が接続される放電管に関する。   This invention relates to a discharge tube in which a discharge gas is sealed in an airtight envelope formed by sealing both end openings of a case member made of an insulating material with a pair of lid members that also serve as discharge electrodes, In particular, the present invention relates to a discharge tube in which a lead terminal is connected to the outer surface side of the lid member.

図８乃至図１０に示すように、この種の放電管60は、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 shown in FIG. 8 to FIG. 10, this type of discharge tube 60 has a pair of lid members 64, 64 that serve as discharge electrodes at both ends of a cylindrical case member 62 made of an insulating material that is open at both ends. A hermetic envelope 66 is formed by hermetically sealing with, and a predetermined discharge gas is sealed in the hermetic envelope 66.

上記蓋部材64の内面には、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が設けられており、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、図８及び図１１に示すように、上記蓋部材64の外面には、底面65と、該底面65の周縁から立設する傾斜面67によって形成された略漏斗形状の凹部69と、上記底面65の略中央から立設する凸状のリード接続部71が設けられている。 On the inner surface of the lid member 64, a planar discharge electrode portion 68 projecting greatly toward the center of the hermetic envelope 66 and a joint portion 70 in contact with the end surface of the case member 62 are provided. A predetermined discharge gap 72 is formed between the 64 and 64 discharge electrode portions 68 and 68.
Further, as shown in FIGS. 8 and 11, on the outer surface of the lid member 64, a substantially funnel-shaped recess 69 formed by a bottom surface 65, an inclined surface 67 standing from the periphery of the bottom surface 65, and the above-mentioned A convex lead connecting portion 71 is provided standing from substantially the center of the bottom surface 65.

また、上記ケース部材62の内壁面74には、その両端が、放電電極を兼ねた上記蓋部材64，64と微小放電間隙76を隔てて配置されたトリガ放電膜78が複数形成されている。   A plurality of trigger discharge films 78 are formed on the inner wall surface 74 of the case member 62 so that both ends of the case member 62 are spaced apart from the lid members 64 and 64 that also serve as discharge electrodes and a minute discharge gap 76.

上記放電電極部68の表面には、実用新案登録第３１２５２６３号等に開示されているように、有底の穴部79が多数形成されており、穴部79内面及び放電電極部68の表面に、臭化セシウム（ＣｓＢｒ）等の電子放出特性が良好な物質を含有した被膜80が形成されている。
尚、放電電極部68の表面の周縁に沿って、上記被膜80が形成されないマージン部81が設けられている。 As disclosed in Utility Model Registration No. 3125263, etc., a large number of bottomed holes 79 are formed on the surface of the discharge electrode portion 68. A film 80 containing a substance having good electron emission characteristics such as cesium bromide (CsBr) is formed.
A margin portion 81 where the coating film 80 is not formed is provided along the peripheral edge of the surface of the discharge electrode portion 68.

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、ネオン（Ｎｅ）とアルゴン（Ａｒ）の混合ガス中に、水素（Ｈ２）を混合して構成した放電ガスが該当する。 The discharge gas sealed in the hermetic envelope 66 corresponds to, for example, a discharge gas configured by mixing hydrogen (H 2 ) in a mixed gas of neon (Ne) and argon (Ar).

従来の上記放電管60にあっては、放電電極を兼ねた上記一対の蓋部材64，64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の両端と蓋部材64，64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。
実用新案登録第３１２５２６３号 In the conventional discharge tube 60, when a voltage equal to or higher than the discharge start voltage of the discharge tube 60 is applied between the pair of lid members 64 and 64 serving also as discharge electrodes, both ends of the trigger discharge film 78 are applied. Then, the electric field concentrates in the minute discharge gap 76 between the lid members 64 and 64, and thereby electrons are emitted into the minute discharge gap 76 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, 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.
Utility model registration No. 3125263

従来の上記放電管60は、図１２に示すように、蓋部材64の外面に設けられたリード接続部71に、リード端子73を溶接により接続して使用されるものである。
しかしながら、溶接時の熱衝撃や圧力により、上記蓋部材64が変形し破損することがあった。 As shown in FIG. 12, the conventional discharge tube 60 is used by connecting a lead terminal 73 to a lead connecting portion 71 provided on the outer surface of a lid member 64 by welding.
However, the lid member 64 may be deformed and damaged due to thermal shock or pressure during welding.

この考案は、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、溶接強度が高く、リード端子接続時に蓋部材の変形・破損を生じることのない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 thereof is to realize a discharge tube that has high welding strength and does not cause deformation or breakage of a lid member when a lead terminal is connected. It is in.

上記目的を達成するため、本考案に係る放電管は、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閉塞することによって気密外囲器を形成し、該気密外囲器内に放電ガスを封入すると共に、上記蓋部材の内面に放電電極部を形成して成る放電管であって、上記蓋部材の外面に凹部を形成し、該凹部を形成する底面から立設する凸状のリード接続部を形成すると共に、上記底面の周縁に膨出リブを形成したことを特徴とする。   In order to achieve the above object, a discharge tube according to the present invention has an airtight enclosure by airtightly closing both end openings of a case member made of an insulating material opened at both ends with a pair of lid members that also serve as discharge electrodes. Forming a discharge vessel, enclosing a discharge gas in the hermetic envelope, and forming a discharge electrode portion on the inner surface of the lid member, forming a recess on the outer surface of the lid member, A convex lead connecting portion standing from the bottom surface forming the concave portion is formed, and a bulging rib is formed on the periphery of the bottom surface.

本考案に係る放電管にあっては、蓋部材外面の凹部を形成する底面の周縁に膨出リブを形成したので、蓋部材の機械的強度が向上し、溶接強度も高くなる。このため、蓋部材外面のリード接続部にリード端子を溶接接続した場合でも、蓋部材の変形・破損を生じることがない。   In the discharge tube according to the present invention, since the bulging rib is formed on the peripheral edge of the bottom surface forming the recess on the outer surface of the lid member, the mechanical strength of the lid member is improved and the welding strength is also increased. For this reason, even when the lead terminal is welded to the lead connecting portion on the outer surface of the lid member, the lid member is not deformed or damaged.

本考案に係る放電管10は、図１乃至図４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 to 4, a discharge tube 10 according to the present invention has 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 that opens at both ends. The hermetic envelope 16 is formed by hermetically sealing with the members 14 and 14.

上記蓋部材14は、その内面に、気密外囲器16の中心に向けて大きく突き出た表面が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の表面間には、所定の放電間隙22が形成されている。上記放電電極部18は、断面円柱状と成されている（図２）。
また、図５及び図６に示すように、上記蓋部材14の外面には、底面15と、該底面15の周縁から立設する傾斜面17によって形成された略漏斗形状の凹部19と、上記底面15の略中央から立設する凸状のリード接続部21が設けられている。さらに、上記底面15の周縁には、リング状の膨出リブ23が形成されている。
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, on the inner surface thereof, a discharge electrode portion 18 having a flat surface protruding 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 surfaces of the discharge electrode portions 18 and 18 of the lid members 14 and 14. The discharge electrode portion 18 has a cylindrical cross section (FIG. 2).
Further, as shown in FIGS. 5 and 6, the outer surface of the lid member 14 has a bottom surface 15, a substantially funnel-shaped recess portion 19 formed by an inclined surface 17 erected from the periphery of the bottom surface 15, and A convex lead connecting portion 21 standing from the approximate center of the bottom surface 15 is provided. Further, ring-shaped bulging ribs 23 are formed on the periphery of the bottom surface 15.
The lid member 14 is made of oxygen-free copper or zirconium copper obtained by adding oxygen (Zr) to oxygen-free copper. 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、気密外囲器16を構成する上記ケース部材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。 Further, the inner wall surface 24 of the case member 12 constituting the hermetic envelope 16 has a linear shape in which both ends thereof are arranged with a small discharge gap 26 therebetween and the lid members 14 and 14 that also serve as discharge electrodes. A plurality of trigger discharge films 28 are formed. 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.

図３及び図４に示すように、上記放電電極部18の表面には、略半球状の穴部29が多数形成されており、各穴部29内面に、電子放出特性が良好な物質を含有した被膜30が形成されている。本実施の形態においては、略半球状の穴部29は、４×４の合計１６個が、マトリクス状に配置形成されているが、これに限定されるものではない。   As shown in FIGS. 3 and 4, a large number of substantially hemispherical holes 29 are formed on the surface of the discharge electrode portion 18, and the inner surface of each hole 29 contains a substance having good electron emission characteristics. The coated film 30 is formed. In the present embodiment, a total of 16 4 × 4 hole portions 29 are arranged and formed in a matrix shape, but the present invention is not limited to this.

電子放出特性が良好な物質を含有した上記被膜30は、例えば、臭化セシウム（ＣｓＢｒ）が含有された被膜30で形成することができる。この被膜30は、臭化セシウムの粉末を、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。
この場合、臭化セシウムが０．０１〜７０重量％、バインダーが９９．９９〜３０重量％の配合割合で混合される。
また、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。 The film 30 containing a substance having good electron emission characteristics can be formed of, for example, a film 30 containing cesium bromide (CsBr). The coating 30 can be formed by applying a powder of cesium bromide added to a binder composed of a sodium silicate solution and pure water to the surface of the discharge electrode portion 18.
In this case, cesium bromide is mixed at a blending ratio of 0.01 to 70% by weight and binder is 99.99 to 30% by weight.
The blending 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、ネオン（Ｎｅ）とアルゴン（Ａｒ）の混合ガス中に、水素（Ｈ２）を混合して構成した放電ガスが該当する。 A predetermined discharge gas is sealed in the hermetic envelope 16. As this discharge gas, for example, a discharge gas configured by mixing hydrogen (H 2 ) in a mixed gas of neon (Ne) and argon (Ar) is applicable.

本考案の上記放電管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 that also serve 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.

本考案の上記放電管10は、図７に示すように、蓋部材14の外面に設けられたリード接続部21に、リード端子33を溶接接続して使用されるものである。
而して、本考案の放電管10にあっては、蓋部材14外面の凹部19を形成する底面15の周縁にリング状の膨出リブ23を形成したので、蓋部材14の機械的強度が向上し、溶接強度も高くなる。このため、蓋部材14外面のリード接続部21にリード端子33を溶接接続した場合でも、蓋部材14の変形・破損を生じることがない。 As shown in FIG. 7, the discharge tube 10 of the present invention is used by welding and connecting a lead terminal 33 to a lead connecting portion 21 provided on the outer surface of the lid member 14.
Thus, in the discharge tube 10 of the present invention, since the ring-shaped bulging ribs 23 are formed on the periphery of the bottom surface 15 that forms the concave portion 19 on the outer surface of the lid member 14, the mechanical strength of the lid member 14 is increased. And the weld strength is increased. Therefore, even when the lead terminal 33 is welded to the lead connection portion 21 on the outer surface of the lid member 14, the lid member 14 is not deformed or damaged.

また、本考案の放電管10は、上記膨出リブ23を形成したことにより、蓋部材14の機械的強度・溶接強度が向上する結果、従来の放電管60より、凹部19の深さを深くすることができる。例えば、従来の放電管60の凹部69の深さが０．５mmの場合に、本考案の放電管10であれば、凹部19の深さを０．９５mmとしても、従来の放電管60と同等以上の強度を発揮することができる。
尚、放電電極部18の表面に形成した穴部29の加工状態が不良の場合、規定電圧より低い電圧で放電してしまう早期点弧を生じ易くなるが、蓋部材14の凹部19の深さを深くすることにより、早期点弧の発生を抑制できる効果がある。 Further, in the discharge tube 10 of the present invention, since the bulging rib 23 is formed, the mechanical strength and welding strength of the lid member 14 are improved. As a result, the depth of the recess 19 is deeper than that of the conventional discharge tube 60. can do. For example, when the depth of the concave portion 69 of the conventional discharge tube 60 is 0.5 mm, the discharge tube 10 of the present invention is equivalent to the conventional discharge tube 60 even if the depth of the concave portion 19 is 0.95 mm. The above strength can be exhibited.
In addition, when the processing state of the hole 29 formed on the surface of the discharge electrode portion 18 is poor, it is easy to cause early ignition that discharges at a voltage lower than the specified voltage, but the depth of the concave portion 19 of the lid member 14 By making the depth deeper, there is an effect of suppressing the occurrence of early firing.

尚、本考案の上記放電管10にあっては、放電電極部18の表面に多数の穴部29を形成し、穴部29内面に、電子放出特性が良好な物質を含有した被膜30を形成したことにより、被膜30と放電電極部18との密着力が向上し、放電時の衝撃による被膜30のスパッタを抑制することができ、その結果、放電開始電圧の変動を生じることのない長寿命な放電管を実現するができる。   In the discharge tube 10 of the present invention, a large number of holes 29 are formed on the surface of the discharge electrode portion 18, and a coating 30 containing a substance having good electron emission characteristics is formed on the inner surface of the hole 29. As a result, adhesion between the coating 30 and the discharge electrode portion 18 is improved, and sputtering of the coating 30 due to impact during discharge can be suppressed, and as a result, a long life without causing fluctuations in the discharge start voltage A simple discharge tube can be realized.

また、本考案の放電管10においては、放電電極部18の表面に形成した穴部29を「略半球状」と成したことにより、被膜30の状態が安定化し、放電特性のバラツキを低減することができる。
すなわち、本考案の放電管10の如く、穴部29を「略半球状」と成した場合には、穴部29の全方向から表面張力が均等に掛かり、その結果、被膜30が全方向に均等に形成されるため、被膜30の状態が安定化し、放電特性のバラツキを低減することができるのである。 Further, in the discharge tube 10 of the present invention, the hole 29 formed on the surface of the discharge electrode portion 18 is formed to be “substantially hemispherical”, so that the state of the coating 30 is stabilized and variation in discharge characteristics is reduced. be able to.
That is, as in the discharge tube 10 of the present invention, when the hole 29 is formed in a “substantially hemispherical shape”, the surface tension is uniformly applied from all directions of the hole 29, and as a result, the coating 30 is omnidirectional. Since it is formed uniformly, the state of the coating 30 can be stabilized, and variations in discharge characteristics can be reduced.

本考案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Ｂ−Ｂ概略断面図である。It is BB schematic sectional drawing of FIG. 本考案に係る放電管の部分拡大断面図である。It is a partial expanded sectional view of the discharge tube which concerns on this invention. 図１のＣ−Ｃ概略断面図である。It is CC schematic sectional drawing of FIG. 本考案に係る放電管の蓋部材を示す拡大断面図である。It is an expanded sectional view which shows the cover member of the discharge tube which concerns on this invention. 本考案に係る放電管の蓋部材を示す拡大側面図である。It is an enlarged side view which shows the cover member of the discharge tube which concerns on this invention. 本考案に係る放電管にリード端子を接続した状態を示す説明図である。It is explanatory drawing which shows the state which connected the lead terminal to the discharge tube which concerns on this invention. 従来の放電管を示す概略断面図である。It is a schematic sectional drawing which shows the conventional discharge tube. 従来の放電管の部分拡大断面図である。It is a partial expanded sectional view of the conventional discharge tube. 図８のＡ−Ａ概略断面図である。It is an AA schematic sectional drawing of FIG. 従来の放電管の蓋部材を示す側面図である。It is a side view which shows the cover member of the conventional discharge tube. 従来の放電管にリード端子を接続した状態を示す説明図である。It is explanatory drawing which shows the state which connected the lead terminal to 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
15 蓋部材の外面に形成された底面
16 気密外囲器
17 蓋部材の外面に形成された傾斜面
18 放電電極部
19 蓋部材の外面に形成された凹部
21 蓋部材の外面に形成されたリード接続部
22 放電間隙
23 膨出リブ
26 微小放電間隙
28 トリガ放電膜
29 穴部
30 被膜
33 リード端子 10 discharge tube
12 Case material
14 Lid member
15 Bottom surface formed on the outer surface of the lid member
16 Airtight envelope
17 Inclined surface formed on the outer surface of the lid member
18 Discharge electrode
19 Concave part formed on the outer surface of the lid member
21 Lead connection formed on the outer surface of the lid member
22 Discharge gap
23 bulging ribs
26 Micro discharge gap
28 Trigger discharge membrane
29 holes
30 coating
33 Lead terminal

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閉塞することによって気密外囲器を形成し、該気密外囲器内に放電ガスを封入すると共に、上記蓋部材の内面に放電電極部を形成して成る放電管であって、上記蓋部材の外面に凹部を形成し、該凹部を形成する底面から立設する凸状のリード接続部を形成すると共に、上記底面の周縁に膨出リブを形成したことを特徴とする放電管。   An airtight envelope is formed by airtightly closing the opening portions at both ends of a case member made of an insulating material having both ends opened by a pair of lid members that also serve as discharge electrodes, and discharge gas is discharged into the airtight envelope. A discharge tube formed by enclosing and forming a discharge electrode portion on the inner surface of the lid member, wherein a concave portion is formed on the outer surface of the lid member, and a convex lead connection standing from the bottom surface forming the concave portion And a bulging rib formed on the periphery of the bottom surface.
JP2007003400U 2007-05-11 2007-05-11 Discharge tube Expired - Lifetime JP3133822U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007003400U JP3133822U (en) 2007-05-11 2007-05-11 Discharge tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007003400U JP3133822U (en) 2007-05-11 2007-05-11 Discharge tube

Publications (1)

Publication Number Publication Date
JP3133822U true JP3133822U (en) 2007-07-26

Family

ID=43284454

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007003400U Expired - Lifetime JP3133822U (en) 2007-05-11 2007-05-11 Discharge tube

Country Status (1)

Country Link
JP (1) JP3133822U (en)

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