JPH0628777Y2 - Electrode for flash discharge tube - Google Patents
Electrode for flash discharge tubeInfo
- Publication number
- JPH0628777Y2 JPH0628777Y2 JP143489U JP143489U JPH0628777Y2 JP H0628777 Y2 JPH0628777 Y2 JP H0628777Y2 JP 143489 U JP143489 U JP 143489U JP 143489 U JP143489 U JP 143489U JP H0628777 Y2 JPH0628777 Y2 JP H0628777Y2
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- core wire
- discharge tube
- flash discharge
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Discharge Lamp (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 本考案は、写真撮影等に使用される閃光放電管の電極に
関するものである。TECHNICAL FIELD The present invention relates to an electrode of a flash discharge tube used for photography and the like.
従来の技術 まず、写真撮影等に使用される閃光放電管について第２
図を用いて説明する。第２図において、タングステン芯
線５の先端には、電子放射性物質を含有する焼結体１が
固定されている。タングステン芯線５は封着用ガラス４
の部分でガラス管６と気密に封着されている。ガラス管
６内にはキセノン等の希ガス７が封入されており、さら
にその外壁面にはトリガ電極８が密着して付設されてい
る。2. Description of the Related Art First, a flash discharge tube used for photography etc.
It will be described with reference to the drawings. In FIG. 2, a sintered body 1 containing an electron emissive material is fixed to the tip of the tungsten core wire 5. Tungsten core wire 5 is glass for sealing 4
The glass tube 6 is hermetically sealed at the portion. A rare gas 7 such as xenon is enclosed in the glass tube 6, and a trigger electrode 8 is attached in close contact with the outer wall surface thereof.
次に、このような構造の閃光放電管用電極における焼結
体と芯線の固定方法について第３図Ａ〜Ｃを用いて証明
する。第３図Ａにおいて、焼結体１は筒状になってお
り、穴２はテーパを有している。第３図Ｂにおいて、還
元雰囲気中でガスバーナ加熱により芯線５に封着用ガラ
ス４をガラス巻きする。そして、第３図Ｃに示すよう
に、筒状の焼結体１の穴２に芯線５を圧入して固定して
いた。Next, a method of fixing the sintered body and the core wire in the electrode for a flash discharge tube having such a structure will be proved with reference to FIGS. In FIG. 3A, the sintered body 1 has a cylindrical shape, and the hole 2 has a taper. In FIG. 3B, the glass for sealing 4 is wound on the core wire 5 by heating with a gas burner in a reducing atmosphere. Then, as shown in FIG. 3C, the core wire 5 was press-fitted and fixed in the hole 2 of the cylindrical sintered body 1.
考案が解決しようとする課題 このような、焼結体と芯線の従来の固定方法では、次の
ような問題点があった。すなわち、還元雰囲気中でガス
バーナ加熱により芯線５に封着用ガラス４をガラス巻き
する作業において、ガスバーナで芯線５を加熱すると、
芯線５の一部が還元されて外径が痩せ細る。ガスバーナ
の火力が強く加熱時間を長くすると、還元される量も多
くなり芯線の外径は、より細くなる。ガスバーナの火力
と加熱時間は、芯線の素材の外径、封着用ガラスの材質
および肉厚によって調整しなければならないため、ガラ
ス巻きされた後の芯線の外径を事前に正確に予知するこ
とは非常に困難である。また、焼結体の穴径も焼結温度
や時間によってばらついている。したがって、焼結体に
芯線を圧入して固定する際、芯線外径が大きいものは、
芯線先端が焼結体の途中までしか圧入できなかったり、
無理に圧入すると焼結体の割れが発生していた。また、
芯線の外径が焼結体の穴径より小さいものは固定できな
かった。Problems to be Solved by the Invention The conventional fixing method of the sintered body and the core wire has the following problems. That is, in the work of winding the sealing glass 4 around the core 5 by heating the core 5 in the reducing atmosphere by heating the core 5 with the gas burner,
A part of the core wire 5 is reduced and the outer diameter becomes thin. If the heating power of the gas burner is strong and the heating time is extended, the amount of reduction is increased and the outer diameter of the core wire becomes smaller. Since the heating power and heating time of the gas burner must be adjusted according to the outer diameter of the core wire material, the material of the sealing glass and the wall thickness, it is not possible to accurately predict in advance the outer diameter of the core wire after the glass is wound. Very difficult. Further, the hole diameter of the sintered body also varies depending on the sintering temperature and time. Therefore, when the core wire is press-fitted and fixed to the sintered body, if the core wire has a large outer diameter,
The tip of the core wire can only be pressed into the sintered body,
When forcedly press-fitted, the sintered body was cracked. Also,
If the outer diameter of the core wire was smaller than the hole diameter of the sintered body, it could not be fixed.
本考案は、ガラス巻きされた芯線の外径を事前に正確に
予知することなしに、焼結体に芯線を正しい位置に確実
に圧入して保持することのできる閃光放電管用電極を提
供するものである。The present invention provides an electrode for a flash discharge tube capable of reliably press-fitting and holding a core wire in a sintered body in a correct position without accurately predicting the outer diameter of the glass-wrapped core wire in advance. Is.
課題を解決するための手段 本考案の閃光放電管用電極は、電子放射性物質を含有す
る筒状の焼結体に、前記焼結体の基体金属と同一材質よ
りなる金属箔とともに芯線を圧入したものである。Means for Solving the Problems The electrode for a flash discharge tube of the present invention is one in which a core wire is pressed into a cylindrical sintered body containing an electron emitting substance together with a metal foil made of the same material as the base metal of the sintered body. Is.
作用 本考案における芯線の外径は、金属箔の箔厚を考慮し
て、焼結体の穴径よりも小さくしている。すなわち、金
属箔の介在がない場合は、芯線は、焼結体の穴に自由に
挿入可能な寸法とし、金属箔を介在したとき、圧入によ
って確実に固定される構成をとる。焼結体の穴径のばら
つきや芯線の外径のばらつきにより、一枚の金属箔では
固定の強度が弱い場合は、二枚またはそれ以上の金属箔
を介在させて固定を確実なものとすることができる。こ
の構成により、芯線を焼結体の充分な深さまで圧入が可
能となり、また金属箔の緩衝効果により、無理な圧入に
よって焼結体が割れるなどの不具合が発生せず、焼結体
と芯線の固定が合理的におこなえるようになった。ま
た、焼結体の基体金属と同一の材質の金属箔を用いてい
るため、閃光放電管の点灯中、電極の温度上昇によっ
て、焼結体が芯線から抜け出ることもない。The outer diameter of the core wire in the present invention is smaller than the hole diameter of the sintered body in consideration of the foil thickness of the metal foil. That is, when there is no intervening metal foil, the core wire is sized so that it can be freely inserted into the hole of the sintered body, and when the metal foil is interposed, it is securely fixed by press fitting. If the fixing strength of one metal foil is weak due to the variation of the hole diameter of the sintered body or the variation of the outer diameter of the core wire, secure the fixing by interposing two or more metal foils. be able to. With this configuration, it is possible to press fit the core wire to a sufficient depth of the sintered body, and the buffer effect of the metal foil does not cause problems such as cracking of the sintered body due to forced press-fitting. Fixation can now be done reasonably. Further, since the metal foil made of the same material as the base metal of the sintered body is used, the sintered body does not come out of the core wire due to the temperature rise of the electrodes during the lighting of the flash discharge tube.
実施例 第１図は、本考案の一実施例である閃光放電管用電極の
一部断面図である。第１図において、モリブデン粉末
と、ＴｈＯ２−ＢａＯ−ＣａＯ−Ａ２Ｏ3等を組成と
する電子放射性物質の混合粉末を加工して筒状をなす焼
結体１のテーパを有する穴２に、モリブデン箔３を介在
させ、封着用ガラス４をガラス巻きしたタングステンよ
りなる芯線５を圧入する。実施例においてはガラス巻き
後の芯線の外径は2.09〜2.11mm、モリブデン箔は厚みが
0.035±0.005mm、幅が0.35±0.01mmである。焼結体１の
穴径と芯線５の外径とのすき間の大きさの違いによっ
て、穴２にモリブデン箔３を１枚またはそれ以上介在さ
せて、芯線５を圧入する。EXAMPLE FIG. 1 is a partial cross-sectional view of an electrode for a flash discharge tube which is an example of the present invention. In FIG. 1, a mixed powder of molybdenum powder and an electron emissive material having a composition of ThO 2 —BaO—CaO—A 2 O 3 and the like is processed to form a tapered hole 2 of a sintered body 1 having a cylindrical shape. Then, a core wire 5 made of tungsten in which glass 4 for sealing is glass-wound is press-fitted with molybdenum foil 3 interposed. In the example, the outer diameter of the core wire after glass winding is 2.09 to 2.11 mm, and the thickness of the molybdenum foil is
The width is 0.035 ± 0.005 mm and the width is 0.35 ± 0.01 mm. Depending on the size difference between the hole diameter of the sintered body 1 and the outer diameter of the core wire 5, one or more molybdenum foils 3 are interposed in the hole 2 and the core wire 5 is press-fitted.
考案の効果 以上説明したように、本考案は焼結体の穴径のばらつき
や、芯線の外径のばらつきが発生しても、芯線を焼結体
の穴に充分な深さまで確実に圧入でき、強固な固定が可
能である。また、金属箔の緩衝効果により、無理な圧入
によって焼結体が割れるという不具合が発生せず、焼結
体と芯線の固定が合理的におこなえる。また、焼結体の
基体金属と同一の材質の金属箔を用いているため、閃光
放電管の点灯中、電極の温度上昇によって焼結体が芯線
から抜け出ることがなく、また点灯電圧の上昇や、電極
の消耗などもなく、長期間を通じてきわめて安定した特
性を有する閃光放電管を提供することができるものであ
る。Effects of the Invention As described above, the present invention can reliably press-fit the core wire into the hole of the sintered body even if the hole diameter of the sintered body varies or the outer diameter of the core wire varies. It can be firmly fixed. In addition, due to the buffering effect of the metal foil, the problem that the sintered body is cracked by forced press-fitting does not occur, and the sintered body and the core wire can be rationally fixed. Further, since the metal foil made of the same material as the base metal of the sintered body is used, the sintered body does not come out of the core wire due to the temperature rise of the electrode during the lighting of the flash discharge tube, and the lighting voltage rises. Thus, it is possible to provide a flash discharge tube having extremely stable characteristics over a long period of time without consumption of electrodes.
第１図は本考案の一実施例である閃光放電管用電極の要
部断面図、第２図は写真撮影等に使用される一般的な閃
光放電管の一部切欠正面図、第３図Ａ，Ｂ，Ｃは閃光放
電管用電極における焼結体と芯線の従来の固定方法を説
明するための図である。 １……焼結体、２……穴、３……金属箔、４……封着用
ガラス、５……芯線。FIG. 1 is a sectional view of an essential part of an electrode for a flash discharge tube which is an embodiment of the present invention, FIG. 2 is a partially cutaway front view of a general flash discharge tube used for photography and the like, and FIG. 3A. , B, and C are views for explaining a conventional fixing method of the sintered body and the core wire in the electrode for the flash discharge tube. 1 ... Sintered body, 2 ... Hole, 3 ... Metal foil, 4 ... Sealing glass, 5 ... Core wire.
Claims (1)
穴に、前記焼結体の基体金属と同一材質よりなる金属箔
とともに芯線を圧入したことを特徴とする閃光放電管用
電極。1. An electrode for a flash discharge tube in which a core wire is pressed into a hole of a cylindrical sintered body containing an electron emitting substance together with a metal foil made of the same material as the base metal of the sintered body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP143489U JPH0628777Y2 (en) | 1989-01-10 | 1989-01-10 | Electrode for flash discharge tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP143489U JPH0628777Y2 (en) | 1989-01-10 | 1989-01-10 | Electrode for flash discharge tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0292659U JPH0292659U (en) | 1990-07-23 |
| JPH0628777Y2 true JPH0628777Y2 (en) | 1994-08-03 |
Family
ID=31201316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP143489U Expired - Lifetime JPH0628777Y2 (en) | 1989-01-10 | 1989-01-10 | Electrode for flash discharge tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0628777Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4797790B2 (en) * | 2006-05-22 | 2011-10-19 | ウシオ電機株式会社 | Discharge lamp |
-
1989
- 1989-01-10 JP JP143489U patent/JPH0628777Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0292659U (en) | 1990-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |