JP2006269307A

JP2006269307A - Electrode of discharge tube

Info

Publication number: JP2006269307A
Application number: JP2005087488A
Authority: JP
Inventors: Shoji Ishihara; 彰二石原; Takeshige Shimazu; 雄滋嶋津
Original assignee: HIMEJI RIKA KK; LAMP TECHNOLOGY KK
Current assignee: HIMEJI RIKA KK; LAMP TECHNOLOGY KK
Priority date: 2005-03-25
Filing date: 2005-03-25
Publication date: 2006-10-05

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture an electrode of a discharge tube at low cost with ease by connecting an electrode tip and a base material together without using a brazing material. <P>SOLUTION: The electrode of discharge tube comprises an electrode tip 14 and a base metal 13, where the electrode tip 14 is made by an easy-electron emission material being mixed into a porous sintered body which is formed at a sharp angle on a top 14b and is made of a high melting point metal, a holder 13b in a shape of a cylinder is formed on the top of the base metal 13, and the top side of the holder 13b is open. The electrode tip 14 is inserted into the holder 13b, scraped/fitted on/to the holder 13b, and attached to the top of the base metal 13 via the holder 13b. On the other hand, a holder 151 is tapered and inserted into the body 141a of an electrode tip 121 to link the base of the holder 151 to a base metal 131. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、放電管の電極に関するものである。 The present invention relates to an electrode of a discharge tube.

一般に、ファイバースコープ用、あるいは露光用等の光源として放電管が多用されている。該放電管は陰極と陽極とを対向させて放電ガスの雰囲気中に封入し、陰極と陽極との間でアーク放電させて発光させるようになっている。ところで、従来の放電管に使用されている電極（陰極、陽極）は図７に示すようになっている。 In general, a discharge tube is frequently used as a light source for a fiberscope or for exposure. The discharge tube is sealed in a discharge gas atmosphere with a cathode and an anode facing each other, and arc discharge is performed between the cathode and the anode to emit light. Incidentally, the electrodes (cathode, anode) used in the conventional discharge tube are as shown in FIG.

図７において、１は一方の電極をなす陰極であり、母材２の先端部に陰極チップ３を固着してなる。即ち、前記母材２はモリブデン鋼（高融点金属材）により円柱状に形成するとともに、その先端部に凹部２ａを形成してなり、前記陰極チップ３は胴部３ａを円柱に、頭部３ｂを円錐状に形成した高融点金属製の多孔質焼結体内にバリウム（易電子放射性物質）を含浸させてなり、前記凹部２ａにモリブデン−ルテニウムからなるろう材４を介在させて陰極チップ３の胴部３ａを嵌合させ、これらを加熱処理して前記ろう材４を溶融し、該ろう材４を介して前記陰極チップ３と母材２とを固着する。 In FIG. 7, reference numeral 1 denotes a cathode that forms one electrode, and is formed by fixing a cathode chip 3 to the tip of a base material 2. That is, the base material 2 is formed of molybdenum steel (a high melting point metal material) in a cylindrical shape, and a recess 2a is formed at the tip thereof, and the cathode tip 3 has a body portion 3a as a cylinder and a head 3b. Is formed by impregnating a porous sintered body made of refractory metal having a conical shape with barium (easy-electron-emitting substance), and interposing a brazing material 4 made of molybdenum-ruthenium in the recess 2a. The body portion 3 a is fitted, and these are heated to melt the brazing material 4, and the cathode chip 3 and the base material 2 are fixed to each other through the brazing material 4.

前記従来のものは、ろう材４の融点１９５０℃が、多孔質焼結体内にバリウムを含浸させるときの温度約１５００℃よりも高く、陰極チップ３を母材２に固着（ろう接）する際の加熱温度が必要以上に高くなると、前記バリウムの一部が多孔質焼結体から流出したり、前記ろう材４の一部が多孔質焼結体内に浸入したりすることになる。このため、陰極チップ３を母材２にろう接する際の温度設定範囲を小さくせねばならず、温度管理が難しくなるものであった。また、高価なモリブデン−ルテニウム製のろう材４を使用する必要があった。 In the prior art, the melting point 1950 ° C. of the brazing material 4 is higher than about 1500 ° C. when the porous sintered body is impregnated with barium, and the cathode tip 3 is fixed (brazed) to the base material 2. When the heating temperature becomes higher than necessary, a part of the barium flows out from the porous sintered body, or a part of the brazing material 4 enters the porous sintered body. For this reason, the temperature setting range when the cathode tip 3 is brazed to the base material 2 has to be reduced, and temperature management becomes difficult. Further, it is necessary to use an expensive molybdenum-ruthenium brazing material 4.

特開２０００−２１５８４４号公報JP 2000-215844 A

本発明は、電極チップと母材とを、ろう材を使用しないで接続することにより、安価でかつ製造の容易な放電管の電極を得ることを目的とする。 An object of the present invention is to obtain an electrode of a discharge tube that is inexpensive and easy to manufacture by connecting an electrode chip and a base material without using a brazing material.

請求項１に係る発明は、頭部が尖鋭に形成された高融点金属材からなる多孔質焼結体に易電子放射性物質を混入させてなる電極チップと、高融点金属材により棒状に形成された母材とを設け、前記母材の先端部に先端側が開口した筒状のホルダーを設け、該ホルダーに前記電極チップを嵌合させるとともに、該電極チップを前記ホルダーに摩擦係合させ、前記ホルダーを介して前記電極チップを前記母材の先端部に当接させる構成にしたものである。
請求項２に係る発明は、前記母材と別体のホルダーを設け、該ホルダーを、筒状の嵌合部と、該嵌合部の先端部を小径に絞った環状の係合部とを一体に有する構成とし、該ホルダーの嵌合部を電極チップの胴部に嵌合させるとともに、前記係合部を電極チップの頭部の基部側に係合させ、前記嵌合部の基部を母材に連結するようにしたものである。
請求項３に係る発明は、前記電極チップの胴部を先端方向に向かって縮小するテーパー状に形成し、前記ホルダーを先端方向に向かって縮小するテーパー筒状に形成し、該ホルダーを前記電極チップの胴部にテーパー嵌合させ、該ホルダーの基部を母材に連結するようにしたものである。
請求項４に係る発明は、前記ホルダーをコイル状とし、該ホルダーを電極チップの胴部と母材の外周とに圧着嵌合させることにより，前記電極チップを母材に連結するようにしたものである。 The invention according to claim 1 is formed in a rod shape from an electrode tip obtained by mixing an electron-emitting material into a porous sintered body made of a refractory metal material having a sharp head and a refractory metal material. A cylindrical holder having a distal end opened at the distal end portion of the base material, the electrode tip is fitted into the holder, the electrode tip is frictionally engaged with the holder, The electrode tip is brought into contact with the tip of the base material via a holder.
According to a second aspect of the present invention, a holder is provided separately from the base material, and the holder includes a cylindrical fitting portion, and an annular engagement portion in which a tip end portion of the fitting portion is narrowed to a small diameter. The fitting portion of the holder is fitted to the body portion of the electrode tip, the engagement portion is engaged with the base side of the head portion of the electrode tip, and the base portion of the fitting portion is used as a mother. It is connected to the material.
According to a third aspect of the present invention, the body of the electrode tip is formed in a tapered shape that decreases toward the tip direction, and the holder is formed in a tapered cylinder shape that decreases in the tip direction. The base part of the holder is connected to the base material by taper fitting to the body part of the chip.
According to a fourth aspect of the present invention, the holder is coiled, and the electrode chip is connected to the base material by crimping and fitting the holder to the body of the electrode chip and the outer periphery of the base material. It is.

請求項１に係る発明は、母材の先端部に設けた筒状のホルダーに電極チップを嵌合させて摩擦係合させるようにしので、電極チップ及び母材を加熱することなく両者を連結することができ、加熱による電極チップの劣化を防止することができるとともに、安価でかつ製造の容易な電極を得ることができる。
請求項２に係る発明は、筒体の先端部を絞ってホルダーを形成し、該ホルダーの係合部を電極チップに係合させるようにしたので、ホルダーの形状が簡素になって安価になるとともに、電極チップが安定して母材に連結されることになる。
請求項３に係る発明は、ホルダーが電極チップの胴部にテーパー嵌合により摩擦係合するので、ホルダーと電極チップとの接触面積が増大し、ホルダーによる電極チップの放熱効果が高くなるとともに、電極チップが安定して母材に連結されることになる。
請求項４に係る発明は、ホルダーをコイル状としたので、該ホルダーによる電極チップと母材との連結作業が迅速に行えることになる。 In the invention according to claim 1, since the electrode tip is fitted and frictionally engaged with the cylindrical holder provided at the tip of the base material, the electrode tip and the base material are connected without heating. It is possible to prevent deterioration of the electrode tip due to heating, and to obtain an electrode that is inexpensive and easy to manufacture.
According to the second aspect of the present invention, the holder is formed by narrowing the tip of the cylindrical body, and the engaging portion of the holder is engaged with the electrode chip, so that the shape of the holder is simplified and the cost is reduced. At the same time, the electrode tip is stably connected to the base material.
In the invention according to claim 3, since the holder is frictionally engaged with the body of the electrode tip by taper fitting, the contact area between the holder and the electrode tip is increased, and the heat dissipation effect of the electrode tip by the holder is increased. The electrode tip is stably connected to the base material.
In the invention according to claim 4, since the holder is coiled, the electrode chip and the base material can be quickly connected by the holder.

以下、本発明の実施の形態を図面に基いて説明する。図面において、図１は本発明が適用される放電管の部分断面側面図、図２は本発明による陰極の第１実施例を示す部分断面側面図、図３は本発明による陰極の第２実施例を示す部分断面側面図、図４は本発明による陰極の第３実施例を示す部分断面側面図、図５は本発明による陰極の第４実施例を示す部分断面側面図、図６は本発明による陰極の第５実施例を示す部分断面側面図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a partial sectional side view of a discharge tube to which the present invention is applied, FIG. 2 is a partial sectional side view showing a first embodiment of a cathode according to the present invention, and FIG. 3 is a second embodiment of a cathode according to the present invention. FIG. 4 is a partial sectional side view showing a third embodiment of the cathode according to the present invention, FIG. 5 is a partial sectional side view showing the fourth embodiment of the cathode according to the present invention, and FIG. It is a partial cross section side view which shows 5th Example of the cathode by invention.

図１において、１０はキセノンガスと水銀を発光させてファイバースコープ用、あるいは露光用の光源等に利用される放電管であり、キセノンガス及び水銀を封入したガラスバルブ１１内に、陰極１２と陽極２０とを対向させ、両端部に設けた導電箔１４、口金１５を介して前記陰極１２及び陽極２０に通電し、ガラスバルブ１１内に封入したキセノンガスと水銀を発光させるようにしている。 In FIG. 1, reference numeral 10 denotes a discharge tube that is used for a light source for fiberscope or exposure by emitting xenon gas and mercury. A cathode 12 and an anode are placed in a glass bulb 11 enclosing xenon gas and mercury. The cathode 12 and the anode 20 are energized through the conductive foil 14 and the base 15 provided at both ends so that the xenon gas and mercury enclosed in the glass bulb 11 are emitted.

前記陰極１２は、図２に示すように、棒状の母材１３の先端部にホルダー１３ｂを介して頭部１４ｂが尖鋭に形成された陰極チップ１４を一体的に連結してなる。前記母材１３は、高融点金属材、本例ではモリブデン鋼により、直径約５ｍｍ、長さ約２０ｍｍの棒状に形成するとともに、胴部１３ａの先端部（図２において上端部）に先端（上面）が開口した有底円筒状のホルダー１３ｂを一体に有する。 As shown in FIG. 2, the cathode 12 is formed by integrally connecting a cathode chip 14 having a head portion 14b sharply formed at a tip end portion of a rod-shaped base material 13 via a holder 13b. The base material 13 is made of a refractory metal material, in this example molybdenum steel, in the shape of a rod having a diameter of about 5 mm and a length of about 20 mm, and at the tip (upper surface in FIG. 2) the tip (upper surface). ) Is integrally provided with a bottomed cylindrical holder 13b.

前記陰極チップ１４は、高融点金属材、本例では、タングステン粉末、あるいは顆粒タングステン焼結体を高温、高圧下で焼成した多孔質焼結体内に、アルミン酸バリウムを含むアルミン酸アルカリ土類からなる電子放射性物質（エミッタ）を溶融・混入（含浸を含む）させてなり、前記ホルダー１３ｂに嵌合する円柱状の胴部１４ａと、その先端部（図２において上端部）に位置する円錐状の頭部１４ｂとを一体に有する。 The cathode tip 14 is made of a refractory metal material, in this example, a tungsten powder or a granular tungsten sintered body sintered at a high temperature and a high pressure from an alkaline earth aluminate containing barium aluminate. An electron-emitting substance (emitter) is melted and mixed (including impregnation), and a cylindrical body portion 14a fitted into the holder 13b, and a conical shape located at the tip portion (the upper end portion in FIG. 2) The head 14b is integrally formed.

前記ホルダー１３ｂの嵌合部１３ｃは、陰極チップ１４の胴部１４ａが密接に嵌合する内径にするとともに、その深さは前記胴部１４ａの高さよりも若干深く形成しておく。そして、ホルダー１３ｂに陰極チップ１４の胴部１４ａを嵌合させる際には、ホルダー１３ｂを加熱してその内径を拡張させ、この状態で前記胴部１４ａを嵌合させる。次いで、図２に示すように、ホルダー１３ｂの先端部１３ｄを小径方向にかしめて前記頭部１４ｂの基部側の斜面に沿わせる。これにより、図２に示すような陰極１２を得る。 The fitting portion 13c of the holder 13b has an inner diameter with which the barrel portion 14a of the cathode tip 14 is closely fitted, and the depth thereof is slightly deeper than the height of the barrel portion 14a. And when fitting the trunk | drum 14a of the cathode chip 14 with the holder 13b, the holder 13b is heated, the internal diameter is expanded, and the said trunk | drum 14a is fitted in this state. Next, as shown in FIG. 2, the tip 13d of the holder 13b is caulked in the small diameter direction so as to be along the slope on the base side of the head 14b. Thereby, the cathode 12 as shown in FIG. 2 is obtained.

前記実施例によれば、円筒状のホルダー１３ｂの先端部をかしめて陰極チップ１４の頭部１４ｂの基部に摩擦係合させるようにしたので、母材１３への陰極チップ１４の取り付けが容易になるとともに、陰極チップ１４が安定して母材１３に連結されることになる。また、この連結時に陰極チップ１２が加熱されないので、該陰極チップ１２の劣化を防止することができる。 According to the above embodiment, the tip of the cylindrical holder 13b is caulked and frictionally engaged with the base of the head 14b of the cathode tip 14, so that the cathode tip 14 can be easily attached to the base material 13. At the same time, the cathode tip 14 is stably connected to the base material 13. Moreover, since the cathode chip 12 is not heated at the time of this connection, deterioration of the cathode chip 12 can be prevented.

図３は第２実施例を示す。図４において、１２は陰極、１３は母材、１４は陰極チップ、１５はホルダーであり、これらは前述した第２実施例と略同様の資材により形成されている。前記母材１３は、その先端部に段状かつ小径の載置部１３１ａを形成されている。前記ホルダー１５は、母材１３と別体に形成されるもので、高融点金属材、本例ではモリブデン鋼により円筒状の嵌合部１５ａと、その先端部（図３において上端部）を小径に絞った環状の係合部１５ｂとを一体に有する。前記嵌合部１５ａは陰極チップ１４の胴部１４ａ、及び母材１３の載置部１３ｅが遊嵌する径とし、前記係合部１５ｂは陰極チップ１４の頭部１４ｂの基部側に沿うテーパー状にする。 FIG. 3 shows a second embodiment. In FIG. 4, 12 is a cathode, 13 is a base material, 14 is a cathode chip, and 15 is a holder, and these are formed of materials substantially the same as those of the second embodiment described above. The base material 13 is provided with a stepped and small-diameter mounting portion 131a at the tip. The holder 15 is formed separately from the base material 13, and a cylindrical fitting portion 15a made of a high melting point metal material, in this example, molybdenum steel, and its tip portion (upper end portion in FIG. 3) have a small diameter. And an annular engaging portion 15b that is narrowed down to a single body. The fitting portion 15a has a diameter in which the body portion 14a of the cathode tip 14 and the placement portion 13e of the base material 13 are loosely fitted, and the engaging portion 15b is tapered along the base side of the head portion 14b of the cathode tip 14. To.

そして、前記陰極チップ１４をホルダー１５に嵌合させるとともに、その頭部１４ｂの基部側をホルダー１５の係合部１５ｂにテーパー係合（摩擦係合）させる。この場合、前記陰極チップ１４の胴部１４ａとホルダー１５の嵌合部１５ａとの間隙部にモリブデン箔（高融点金属箔）１６を充填するようにしてもよい。次いで、前記陰極チップ１４の底面を母材１３の上面に当接させるとともに、ホルダー１５の基部（下端部）を母材１３の載置部１３ｅに嵌合させた後、ホルダー１５の基部と母材１３の上端部とを溶接１７により一体的に連結し、図３に示すような陰極１２を得る。 Then, the cathode tip 14 is fitted into the holder 15, and the base side of the head portion 14 b is taper-engaged (frictionally engaged) with the engaging portion 15 b of the holder 15. In this case, molybdenum foil (refractory metal foil) 16 may be filled in the gap between the body 14 a of the cathode chip 14 and the fitting portion 15 a of the holder 15. Next, the bottom surface of the cathode chip 14 is brought into contact with the upper surface of the base material 13, and the base portion (lower end portion) of the holder 15 is fitted to the mounting portion 13 e of the base material 13. The upper end of the material 13 is integrally connected by welding 17 to obtain the cathode 12 as shown in FIG.

前記実施例によれば、円筒状のホルダー１５の先端部を絞って係合部１５ｂを形成し、該係合部１５ｂを陰極チップ１４の頭部１４ｂの基部側に係合させるようにしたので、ホルダー１５の形状が簡素になって該ホルダー１５を安価に得ることができるとともに、陰極チップ１４が安定して母材１３に連結されることになる。また、ホルダー１５を溶接１７により母材１３に連結するようにしので、この連結時に陰極チップ１２が加熱されなくなり、陰極チップ１２の劣化を防止することができる。 According to the above embodiment, the distal end portion of the cylindrical holder 15 is narrowed to form the engaging portion 15b, and the engaging portion 15b is engaged with the base side of the head portion 14b of the cathode tip 14. The shape of the holder 15 is simplified, the holder 15 can be obtained at a low cost, and the cathode tip 14 is stably connected to the base material 13. Further, since the holder 15 is connected to the base material 13 by welding 17, the cathode tip 12 is not heated at the time of this connection, and deterioration of the cathode tip 12 can be prevented.

また、図３のように、陰極チップ１４とホルダー１５との間隙部に高融点金属箔１６を充填すれば、陰極チップ１４とホルダー１５との熱伝導率が高くなり、ホルダー１５による陰極チップ１４の放熱が良好に行われ、陰極１２と陽極２０間のアーク放電が長期に亘って安定することになる。 Further, as shown in FIG. 3, if the gap between the cathode tip 14 and the holder 15 is filled with the refractory metal foil 16, the thermal conductivity between the cathode tip 14 and the holder 15 is increased, and the cathode tip 14 by the holder 15 is increased. Thus, the arc discharge between the cathode 12 and the anode 20 is stabilized over a long period of time.

図４は第３実施例を示す。図４において、１２−１は陰極、１３１は母材、１４１は陰極チップ、１５１はホルダーであり、これらは前述した第２実施例と略同様の資材により形成されている。前記母材１３１は、その先端部に段状かつ先端方向（上方）に向かって縮小するテーパー状の載置部１３１ａを形成する。 FIG. 4 shows a third embodiment. In FIG. 4, reference numeral 12-1 denotes a cathode, 131 denotes a base material, 141 denotes a cathode chip, and 151 denotes a holder, which are made of substantially the same material as in the second embodiment described above. The base material 131 forms a stepped and tapered mounting portion 131a that shrinks in the tip direction (upward) at the tip.

前記陰極チップ１４１は、その胴部１４１ａの外周面を先端方向に向かって縮小するテーパー状に形成し、該胴部１４１ａの先端部に円錐状の頭部１４１ｂを一体に形成する。前記胴部１４１ａの外周面のテーパー形状は、母材１３１の載置部１３１ａのテーパー面から連続して延長する形状とする。また、前記ホルダー１５１は、前記母材１３１の載置部１３１ａ、及び陰極チップ１４１の胴部１４１ａにテーパー嵌合するテーパー筒状に形成する。 The cathode chip 141 is formed in a tapered shape in which the outer peripheral surface of the body portion 141a is reduced in the distal direction, and a conical head portion 141b is integrally formed at the distal end portion of the body portion 141a. The taper shape of the outer peripheral surface of the body portion 141a is a shape that continuously extends from the taper surface of the placement portion 131a of the base material 131. In addition, the holder 151 is formed in a tapered cylinder shape that is taper-fitted to the mounting portion 131 a of the base material 131 and the body portion 141 a of the cathode chip 141.

そして、前記陰極チップ１４１をホルダー１５１にテーパー嵌合させ、次いで、前記陰極チップ１４１の底面を母材１３１の上面に当接させるとともに、ホルダー１５１の基部（下端部）を母材１３１の載置部１３１ａにテーパー嵌合させた後、ホルダー１５１の基部を母材１３１に溶接１７１して図４に示すような陰極１２−１を得る。この場合、前記陰極チップ１４１の胴部１４１ａとホルダー１５１との間隙部にモリブデン箔（高融点金属箔）を充填するようにしてもよい。 The cathode chip 141 is taper-fitted to the holder 151, and then the bottom surface of the cathode chip 141 is brought into contact with the upper surface of the base material 131, and the base (lower end) of the holder 151 is placed on the base material 131. After taper fitting to the part 131a, the base part of the holder 151 is welded 171 to the base material 131 to obtain the cathode 12-1 as shown in FIG. In this case, the gap between the body 141a of the cathode chip 141 and the holder 151 may be filled with molybdenum foil (refractory metal foil).

図５は第４実施例を示す。図４において、１２−２は陰極、１３２は母材、１４２は陰極チップ、１５２はホルダーであり、これらは前述した第２実施例と略同様の資材により形成されている。前記母材１３２は、その先端を平坦にした棒状とする。 FIG. 5 shows a fourth embodiment. In FIG. 4, 12-2 is a cathode, 132 is a base material, 142 is a cathode chip, and 152 is a holder, and these are formed of materials substantially the same as those in the second embodiment described above. The base material 132 has a rod shape with a flat tip.

前記陰極チップ１４２は、その胴部１４２ａの外周面を先端方向に向かって縮小するテーパー状にするとともにその下面は平坦とし、該胴部１４２ａの先端部に円錐状の頭部１４２ｂを一体に形成する。また、前記ホルダー１５２は、前記陰極チップ１４２の胴部１４２ａとテーパー嵌合するテーパー筒状とする。 The cathode tip 142 has a tapered shape in which the outer peripheral surface of the barrel portion 142a is reduced toward the distal end and the lower surface thereof is flat, and a conical head portion 142b is integrally formed at the distal end portion of the barrel portion 142a. To do. The holder 152 has a tapered cylindrical shape that is taper-fitted with the body 142a of the cathode tip 142.

そして、前記陰極チップ１４２をホルダー１５２にテーパー嵌合させ、次いで、前記陰極チップ１４２の底面、及びホルダー１５２の底面を母材１３２の上面に当接させた後、ホルダー１５２の基部を母材１３２に溶接１７２して図５に示すような陰極１２−２を得る。この場合、前記陰極チップ１４２の胴部１４２ａとホルダー１５２との間隙部にモリブデン箔（高融点金属箔）を充填するようにしてもよい。 Then, the cathode chip 142 is taper-fitted to the holder 152, and then the bottom surface of the cathode chip 142 and the bottom surface of the holder 152 are brought into contact with the upper surface of the base material 132, and then the base portion of the holder 152 is fixed to the base material 132. To 172 to obtain a cathode 12-2 as shown in FIG. In this case, the gap between the body 142a of the cathode tip 142 and the holder 152 may be filled with molybdenum foil (refractory metal foil).

前記第２、第４実施例によれば、ホルダー１５１（１５２）を電極チップ１４１（１４２）の胴部１４１ａ（１４２ａ）にテーパー嵌合させ、該ホルダー１５１（１５２）の基部を母材１３１（１３２）に溶接１７１（１７２）することにより，前記電極チップ１４１（１４２）を母材１３１（１３２）に連結するようにしたので、両者の接触面積が増大し、ホルダー１５１（１５２）による電極チップ１４１（１４２）の放熱効果が高くなるとともに、電極チップ１４１（１４２）が安定して母材１３１（１３２）に連結されることになる。 According to the second and fourth embodiments, the holder 151 (152) is taper-fitted to the body 141a (142a) of the electrode tip 141 (142), and the base of the holder 151 (152) is the base material 131 ( 132) by welding 171 (172) to connect the electrode tip 141 (142) to the base material 131 (132), the contact area between the two is increased, and the electrode tip by the holder 151 (152) is increased. The heat dissipation effect of 141 (142) is enhanced, and the electrode tip 141 (142) is stably connected to the base material 131 (132).

図６は第５実施例を示す。図６において、１２−３は陰極、１３３は母材、１４３は陰極チップ、１５３はホルダーであり、これらは前述した第２実施例と略同様の資材により形成されている。前記母材１３３は、胴部１３３ａの先端部に小径かつ短尺な円柱状の載置部１３３ｂを形成し、該載置部１３３ｂ基部に環状のくびれ部１３３ｃを形成してなる。また、前記陰極チップ１４３は、その円柱状の胴部１４３ａを前記載置部１３３ｂと略等径にするとともに、該胴部１４３ａの先端部に円錐状の頭部１４３ｂを一体に形成してなる。 FIG. 6 shows a fifth embodiment. In FIG. 6, reference numeral 12-3 denotes a cathode, 133 denotes a base material, 143 denotes a cathode chip, and 153 denotes a holder, which are formed of materials substantially the same as those in the second embodiment described above. The base material 133 is formed by forming a columnar mounting portion 133b having a small diameter and a short diameter at the distal end portion of the body portion 133a, and forming an annular constriction portion 133c at the base portion of the mounting portion 133b. The cathode tip 143 has a cylindrical body portion 143a that is substantially the same diameter as the mounting portion 133b, and a conical head portion 143b that is integrally formed at the tip of the body portion 143a. .

前記ホルダー１５３は、モリブデン製の線材により密着巻きのコイルにするとともに、該コイルの内径はくびれ部１３３ｃよりも若干小径とする。該ホルダー１５３は、その下端コイル部１５３ａを前記母材１３３のくびれ部１３３ｃに圧着嵌合させ、残余のコイル部は前記載置部１３３ｂ及び陰極チップ１４３の胴部１４３ａに圧着嵌合（摩擦係合）させる。 The holder 153 is a coil that is tightly wound with a wire made of molybdenum, and the inner diameter of the coil is slightly smaller than that of the constricted portion 133c. The holder 153 has its lower end coil portion 153a crimp-fitted to the constricted portion 133c of the base material 133, and the remaining coil portion is crimp-fitted to the mounting portion 133b and the body portion 143a of the cathode tip 143 (friction engagement). )

前記第５実施例によれば、ホルダー１５３をコイルにし、これを陰極チップ１４３と母材１３３とに圧着嵌合させて陰極チップ１４３を母材１３３に連結するようにしたので、両者の連結作業が迅速に行えることになる。なお、本発明は、陽極２０も前述した陰極１２（１２１−１２３）と同様の構造にしてもよい。 According to the fifth embodiment, the holder 153 is formed into a coil, and this is crimp-fitted to the cathode chip 143 and the base material 133 so as to connect the cathode chip 143 to the base material 133. Can be done quickly. In the present invention, the anode 20 may have the same structure as the cathode 12 (121-123) described above.

本発明が適用される放電管の部分断面側面図である。It is a partial cross section side view of the discharge tube to which this invention is applied. 本発明による陰極の第１実施例を示す部分断面側面図である。1 is a partial cross-sectional side view showing a first embodiment of a cathode according to the present invention. 本発明による陰極の第２実施例を示す部分断面側面図である。It is a fragmentary sectional side view which shows 2nd Example of the cathode by this invention. 本発明による陰極の第３実施例を示す部分断面側面図である。It is a fragmentary sectional side view which shows 3rd Example of the cathode by this invention. 本発明による陰極の第４実施例を示す部分断面側面図である。It is a partial cross section side view which shows 4th Example of the cathode by this invention. 本発明による陰極の第５実施例を示す部分断面側面図である。FIG. 7 is a partial sectional side view showing a fifth embodiment of the cathode according to the present invention. 従来例を示す陰極の部分断面側面図である。It is a partial cross section side view of the cathode which shows a prior art example.

Explanation of symbols

１０放電管
１１ガラスバルブ
１２（１２−１−１２−３）陰極
１３（１３１−１３３）母材
１３ａ胴部
１３ｂホルダー
１３ｃ嵌合部
１３ｄ先端部
１４（１４１−１４３）陰極チップ（電極チップ）
１４ａ（１４１ａ−１４３ａ）胴部
１４ｂ（１４１ｂ−１４３ｂ頭部
１５（１５１−１５３）ホルダー
１５ａ嵌合部
１５ｂ係合部
１６高融点金属箔
１７（１７１，１７２）溶接
２０陽極 DESCRIPTION OF SYMBOLS 10 Discharge tube 11 Glass bulb 12 (12-1-12-3) Cathode 13 (131-133) Base material 13a Body part 13b Holder 13c Fitting part 13d Tip part 14 (141-143) Cathode chip (electrode chip)
14a (141a-143a) Body part 14b (141b-143b Head 15 (151-153) Holder 15a Fitting part 15b Engaging part 16 Refractory metal foil 17 (171, 172) Welding 20 Anode

Claims

An electrode tip (14) in which an electron-emitting material is mixed in a porous sintered body made of a refractory metal material having a sharp head (14b), and a mother formed in a rod shape from the refractory metal material A cylindrical holder (13b) having a distal end opened at the distal end portion of the base material (13), and fitting the electrode tip (14) to the holder (13b); The electrode tip (14) is frictionally engaged with the holder (13b), and the electrode tip (14) is brought into contact with the tip of the base material (13) through the holder (13b). The electrode of the discharge tube.

A base material (13) and a separate holder (15) are provided. The holder (15) has a cylindrical fitting portion (15a) and an annular shape in which the tip of the fitting portion (15a) is narrowed to a small diameter. The engagement portion (15b) is integrally formed, the fitting portion (15a) of the holder (15) is fitted to the body portion (14a) of the electrode tip (14), and the engagement portion (15b) 2. The discharge tube according to claim 1, wherein the base part of the fitting part (15 a) is connected to the base material (13) by engaging the base part with the base part of the head part (14 b) of the electrode tip (14). Electrodes.

The body (141a) of the electrode tip (141) is formed in a tapered shape that decreases toward the tip direction, and the holder (151) is formed in a tapered cylinder shape that decreases in the tip direction, and the holder (151) is formed. The discharge tube electrode according to claim 1, characterized in that the body (141a) of the electrode tip (141) is taper-fitted, and the base of the holder (151) is connected to the base material (131).

The holder (153) is formed in a coil shape, and the holder (153) is press-fitted to the body (143a) of the electrode tip (143) and the outer periphery of the base material (133). Discharge tube electrodes.