JPH11288686A - Discharge tube - Google Patents
Discharge tubeInfo
- Publication number
- JPH11288686A JPH11288686A JP8848998A JP8848998A JPH11288686A JP H11288686 A JPH11288686 A JP H11288686A JP 8848998 A JP8848998 A JP 8848998A JP 8848998 A JP8848998 A JP 8848998A JP H11288686 A JPH11288686 A JP H11288686A
- Authority
- JP
- Japan
- Prior art keywords
- discharge tube
- tube
- opening
- glass tube
- metal cap
- 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.)
- Granted
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- Discharge Lamp (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶表示装置のバ
ックライト用光源やカメラのストロボ用光源等に用いら
れる放電管に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge tube used for a light source for a backlight of a liquid crystal display device, a light source for a strobe of a camera, and the like.
【０００２】[0002]
【従来の技術】従来より、液晶モジュールのバックライ
ト用の放電管として冷陰極蛍光ランプが多用されてい
る。この冷陰極蛍光ランプは、図９に示すように、内面
に蛍光体１が塗布されたガラス管２の端部に導入線３が
封着され、この導入線３の先端に棒状または筒状の電極
４を保持した構成を有している。2. Description of the Related Art Conventionally, cold cathode fluorescent lamps have been frequently used as discharge tubes for backlights of liquid crystal modules. In this cold cathode fluorescent lamp, as shown in FIG. 9, an introduction wire 3 is sealed at an end of a glass tube 2 having a phosphor 1 coated on the inner surface, and a rod-like or cylindrical shape is attached to the tip of the introduction wire 3. It has a configuration that holds the electrode 4.
【０００３】このような冷陰極蛍光ランプでは、電極構
造が簡単であるがゆえにランプの細管化、コンパクト化
が容易であり、このため液晶表示装置の小型軽量化に適
した光源として有用され、管外径１．８ｍｍのものが実
用化されるに至っている。In such a cold cathode fluorescent lamp, since the electrode structure is simple, it is easy to make the lamp thin and compact, and therefore, it is useful as a light source suitable for reducing the size and weight of a liquid crystal display device. Those having an outer diameter of 1.8 mm have been put to practical use.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
冷陰極蛍光ランプでは、封着部と電極部とを加えたいわ
ゆる非発光部の長さはほとんど短縮されていない。その
ため、最近の液晶モジュールの狭額縁化に対して、従来
の冷陰極蛍光ランプでは、非発光部が長いために液晶画
面の端辺部の輝度が低くなってしまうという問題点があ
った。また、カメラのストロボ用光源として用いられて
いるキセノンフラッシュランプでも同様に長い非発光部
が反射鏡ユニットのコンパクト化を図る上で障害になっ
ていた。さらに、このような冷陰極放電管は、陰極降下
電圧が高いために管電圧、管電力が高く、発光効率が低
いという問題があった。However, in the conventional cold cathode fluorescent lamp, the length of the so-called non-light emitting portion including the sealing portion and the electrode portion is hardly reduced. For this reason, in contrast to the recent narrowing of the frame of the liquid crystal module, the conventional cold cathode fluorescent lamp has a problem that the luminance at the edge of the liquid crystal screen is reduced due to the long non-light emitting portion. Similarly, in a xenon flash lamp used as a light source for a strobe of a camera, a long non-light-emitting portion has similarly been an obstacle to downsizing the reflector unit. Furthermore, such a cold cathode discharge tube has a problem that the tube voltage and the tube power are high because the cathode drop voltage is high, and the luminous efficiency is low.
【０００５】本発明はこのような問題点を解決するため
になされたものであり、狭額縁の液晶モジュールのバッ
クライト用光源や、その他のコンパクト化が要求される
照明装置用の光源に適した、非発光部の長さが短くかつ
発光効率のよい放電管を提供するものである。The present invention has been made to solve such a problem, and is suitable for a light source for a backlight of a liquid crystal module having a narrow frame, and a light source for an illumination device requiring other compactness. It is an object of the present invention to provide a discharge tube having a short non-light-emitting portion and high luminous efficiency.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に本発明の放電管は、両端に開口部を有するガラス管
と、一端に開口部を備え、他端に閉塞部を備えた金属キ
ャップとを有し、前記金属キャップの開口部側が前記ガ
ラス管の各開口部に封着されているものである。In order to solve the above-mentioned problems, a discharge tube according to the present invention comprises a glass tube having openings at both ends, a metal cap having an opening at one end and a closing portion at the other end. Wherein the opening side of the metal cap is sealed to each opening of the glass tube.
【０００７】この構成により、金属キャップが封着部材
と放電電極を兼ね備えることができるので、従来の放電
管に比べて非発光部の長さを短縮することができる。[0007] With this configuration, the metal cap can serve as both the sealing member and the discharge electrode, so that the length of the non-light emitting portion can be reduced as compared with a conventional discharge tube.
【０００８】また、本発明の放電管は、両端に開口部を
有するガラス管と、一端に開口部を備え、他端に閉塞部
を備えた金属キャップとを有し、前記金属キャップの開
口部側が前記ガラス管の各開口部に封着され、かつ前記
金属キャップの内面に電子放射体を備えたものである。Further, the discharge tube of the present invention has a glass tube having an opening at both ends and a metal cap having an opening at one end and a closing portion at the other end. A side is sealed to each opening of the glass tube, and an electron emitter is provided on the inner surface of the metal cap.
【０００９】この構成により、放電電極からの電子放射
効率を高めることができるので、陰極降下電圧を低減さ
せることができる。According to this configuration, the efficiency of electron emission from the discharge electrode can be increased, so that the cathode drop voltage can be reduced.
【００１０】[0010]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照しながら説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１１】本発明の第１の実施の形態の放電管は、図
１に示すように、中央部が外径２．１ｍｍ、内径１．５
ｍｍ、両端部が外径２．０ｍｍ、内径１．４ｍｍのホウ
ケイ酸ガラスからなり、両端に開口部を有し、内面に蛍
光体１を塗布したガラス管５と、一端に開口部を有し、
他端に閉塞部を有し、かつガラス管５の熱膨張係数に近
い熱膨張係数を有するコバール金属からなる金属キャッ
プ６とを有する。そして金属キャップ６は、その開口部
側がガラス管５の開口部内側に挿入され、高周波加熱等
を用いて９００℃に加熱されてガラス管５の各開口部に
封着されており、点灯中はホロー型の放電電極として動
作するものである。金属キャップ６の寸法は外径１．４
ｍｍ、内径１．２ｍｍ、長さ３ｍｍであり、金属キャッ
プ６の先端間距離すなわち電極間距離は８０ｍｍ、放電
管の全長は８６ｍｍである。また、金属キャップ６の閉
塞部の内面には、直径が１．１ｍｍ、厚さ０．５ｍｍの
円板状の、チタン等のゲッタ材料を含んだ水銀合金部材
７を備えている。これは金属キャップ６を封着する時の
加熱によりガラス管５内に水銀を封入するためのもので
ある。チタン等のゲッタ材料はガラス管５内の不純物ガ
スを取り除くためのものである。また、ガラス管５内に
は水銀とともにアルゴンとネオンとの混合ガスが、全圧
が１１ｋＰａになるように封入されている。As shown in FIG. 1, a discharge tube according to a first embodiment of the present invention has an outer diameter of 2.1 mm and an inner diameter of 1.5 mm.
mm, both ends made of borosilicate glass having an outer diameter of 2.0 mm and an inner diameter of 1.4 mm, having openings at both ends, a glass tube 5 coated with the phosphor 1 on the inner surface, and an opening at one end. ,
A metal cap 6 having a closed portion at the other end and made of Kovar metal having a thermal expansion coefficient close to the thermal expansion coefficient of the glass tube 5 is provided. The opening side of the metal cap 6 is inserted into the inside of the opening of the glass tube 5, heated to 900 ° C. using high frequency heating or the like, and sealed to each opening of the glass tube 5. It operates as a hollow discharge electrode. The outer diameter of the metal cap 6 is 1.4.
mm, the inner diameter is 1.2 mm, and the length is 3 mm. The distance between the tips of the metal cap 6, that is, the distance between the electrodes is 80 mm, and the total length of the discharge tube is 86 mm. The inner surface of the closed portion of the metal cap 6 is provided with a disk-shaped mercury alloy member 7 having a diameter of 1.1 mm and a thickness of 0.5 mm and containing a getter material such as titanium. This is for sealing mercury into the glass tube 5 by heating when the metal cap 6 is sealed. The getter material such as titanium is for removing impurity gas in the glass tube 5. Further, a mixed gas of argon and neon together with mercury is sealed in the glass tube 5 so that the total pressure becomes 11 kPa.
【００１２】かかる構成によれば、金属キャップ６が封
着部材と電極とを兼ね備えることができるので、従来の
放電管に比べて非発光部の長さを短縮することができ
る。According to this configuration, since the metal cap 6 can serve as both the sealing member and the electrode, the length of the non-light emitting portion can be reduced as compared with the conventional discharge tube.
【００１３】本発明の第１の実施の形態における放電管
と従来の放電管とを高周波点灯回路を用いて点灯周波数
５０ｋＨｚ、管電流５ｍＡで点灯したところ、放電管の
軸方向の管表面の輝度分布として図２に示す通りの結果
が得られた。図２において、曲線Ａは本発明の第１の実
施の形態における放電管の場合、曲線Ｂは従来の放電管
の場合の輝度分布特性をそれぞれ示す。また、横軸の座
標は、放電管の一方の管端から軸方向に沿った距離を表
す。なお、従来の放電管は図９に示されるように、内面
に蛍光体１が塗布されたガラス管２の端部にコバール金
属からなる導入線３が封着され、さらに導入線３に外径
０．８ｍｍ、長さ３ｍｍのタングステンよりなる棒状の
電極４を保持したものである。この従来の放電管は、全
長を本発明の放電管と同じ８６ｍｍとしており、電極間
距離は７６ｍｍである。When the discharge tube in the first embodiment of the present invention and the conventional discharge tube are lit at a lighting frequency of 50 kHz and a tube current of 5 mA using a high-frequency lighting circuit, the brightness of the tube surface in the axial direction of the discharge tube is obtained. As a distribution, a result as shown in FIG. 2 was obtained. In FIG. 2, a curve A shows the luminance distribution characteristics in the case of the discharge tube according to the first embodiment of the present invention, and a curve B shows the luminance distribution characteristics in the case of the conventional discharge tube. The coordinates on the horizontal axis represent the distance from one end of the discharge tube along the axial direction. In the conventional discharge tube, as shown in FIG. 9, an introduction wire 3 made of Kovar metal is sealed at the end of a glass tube 2 having a phosphor 1 coated on the inner surface. The rod-shaped electrode 4 made of tungsten having a length of 0.8 mm and a length of 3 mm is held. This conventional discharge tube has the same overall length of 86 mm as the discharge tube of the present invention, and the distance between the electrodes is 76 mm.
【００１４】図２より、本発明の第１の実施の形態にお
ける放電管は従来のものに比べ発光部分の長さが長いこ
とが確認された。また、本発明の第１の実施の形態にお
ける放電管の消費電力は従来のものと変わらなかった。
その結果、本発明の第１の実施の形態における放電管は
従来のものに比べ発光効率が約５％向上することが認め
られた。From FIG. 2, it has been confirmed that the discharge tube in the first embodiment of the present invention has a longer light emitting portion than the conventional discharge tube. Further, the power consumption of the discharge tube according to the first embodiment of the present invention was not different from the conventional one.
As a result, it was recognized that the discharge tube according to the first embodiment of the present invention had a luminous efficiency improved by about 5% as compared with the conventional discharge tube.
【００１５】本発明の第２の実施の形態の放電管は、図
３に示すように、金属キャップ６の閉塞部の内面に、チ
タン等のゲッタ材料を含んだ水銀合金部材７および電子
放射体８を備えた構成を有している。その他の構成につ
いては、図１に示すものと同様である。電子放射体８と
してペロブスカイト型結晶構造を有する金属酸化物Ｌａ
0.5Ｓｒ0.5ＭｎＯ3を用い、外径１．１ｍｍ、内径０．
７ｍｍ、長さ２ｍｍの筒状に形成した焼結体とした。そ
して、これを外径１．４ｍｍ、内径１．２ｍｍ、長さ３
ｍｍの金属キャップ６内に収納して電極９を構成した。
内面に蛍光体１を塗布したガラス管５は中央部が外径
２．１ｍｍ、内径１．５ｍｍ、両端部が外径２．０ｍ
ｍ、内径１．４ｍｍであり、ホウケイ酸ガラスからな
る。また、放電管の全長は８６ｍｍであり、ガラス管５
の内部には水銀と共にアルゴンとネオンとの混合ガスが
１１ｋＰａ封入されている。また、金属キャップ６は、
高周波加熱等を用いて９００℃に加熱されてガラス管５
の各開口部に封着されている。As shown in FIG. 3, a discharge tube according to a second embodiment of the present invention has a mercury alloy member 7 containing a getter material such as titanium and an electron emitter on the inner surface of a closed portion of a metal cap 6. 8 is provided. Other configurations are the same as those shown in FIG. Metal oxide La having a perovskite crystal structure as electron emitter 8
0.5 Sr 0.5 MnO 3 , outer diameter 1.1 mm, inner diameter 0.
The sintered body was formed into a cylindrical shape having a length of 7 mm and a length of 2 mm. Then, the outer diameter is 1.4 mm, the inner diameter is 1.2 mm, and the length is 3.
The electrode 9 was accommodated in a metal cap 6 having a thickness of 8 mm.
The glass tube 5 coated with the phosphor 1 on the inner surface has an outer diameter of 2.1 mm at the center, an inner diameter of 1.5 mm, and an outer diameter of 2.0 m at both ends.
m, an inner diameter of 1.4 mm, made of borosilicate glass. The total length of the discharge tube is 86 mm, and the glass tube 5
Is filled with 11 kPa of a mixed gas of argon and neon together with mercury. Also, the metal cap 6
Glass tube 5 heated to 900 ° C. using high-frequency heating or the like
Is sealed at each opening.
【００１６】この構成により、電子放射体８が金属より
も仕事関数が小さいので電極からの電子放出が容易にな
り、陰極降下電圧が低減することにより管電圧が低下
し、結果として管電力が低下し、放電管の発光効率を向
上させることができる。また、筒状に形成された電子放
射体８の中空部において放電が誘起され、電極９の放電
面積を増大させ、電子をより放出しやすくして管電圧の
低減とそれによる発光効率を向上させることができる。
さらに電子放射体８は焼結体であるので、イオン衝撃に
よる飛散が少なく、その飛散物質と管内に封入した水銀
とのアマルガム形成が少なくなるので、電子放射体８お
よび水銀合金部材７の消耗が抑制され、放電管の寿命を
長くすることができる。According to this configuration, since the work function of the electron emitter 8 is smaller than that of metal, electrons can be easily emitted from the electrodes, and the cathode voltage is reduced, so that the tube voltage is reduced. As a result, the tube power is reduced. Thus, the luminous efficiency of the discharge tube can be improved. In addition, a discharge is induced in the hollow portion of the electron emitter 8 formed in a cylindrical shape, the discharge area of the electrode 9 is increased, electrons are more easily emitted, the tube voltage is reduced, and the luminous efficiency is thereby improved. be able to.
Further, since the electron emitter 8 is a sintered body, scattering due to ion bombardment is small, and amalgam formation between the scattering substance and mercury sealed in the tube is reduced, so that the electron emitter 8 and the mercury alloy member 7 are consumed. As a result, the life of the discharge tube can be prolonged.
【００１７】上記電子放射体８を備えた放電管、金属キ
ャップ６のみを備えた放電管および従来の放電管に関し
て、高周波点灯回路を用いて５０ｋＨｚで点灯したとこ
ろ、図４に示す通りの管電流−管電圧特性が得られた。
図４において、曲線Ａが電子放射体８を備えた放電管
（以下放電管Ａという）の場合、曲線Ｂが金属キャップ
６のみを備えた放電管（以下放電管Ｂという）の場合、
曲線Ｃが従来の放電管（以下放電管Ｃという）の場合の
特性である。なお、放電管Ｂは、第１の実施の形態にお
いて説明した、蛍光体１を塗布したガラス管５と、コバ
ール金属からなる金属キャップ６とを有する放電管であ
り、電極間距離は８０ｍｍ、放電管の全長は８６ｍｍで
ある。また、放電管Ｃは図９に示すような構造を有し、
封着部の長さが２ｍｍのコバール金属からなる導入線３
に外径０．８ｍｍ、長さ３ｍｍのタングステンよりなる
棒状の電極４を保持したものであり、電極間距離は７６
ｍｍ、全長は８６ｍｍである。With respect to the discharge tube provided with the electron emitter 8, the discharge tube provided only with the metal cap 6, and the conventional discharge tube, when the lamp was lit at 50 kHz using a high frequency lighting circuit, the tube current as shown in FIG. -Tube voltage characteristics were obtained.
In FIG. 4, a curve A represents a discharge tube provided with the electron emitter 8 (hereinafter referred to as a discharge tube A), and a curve B represents a discharge tube provided with only the metal cap 6 (hereinafter referred to as a discharge tube B).
Curve C is the characteristic in the case of a conventional discharge tube (hereinafter referred to as discharge tube C). The discharge tube B is a discharge tube having the glass tube 5 coated with the phosphor 1 and the metal cap 6 made of Kovar metal described in the first embodiment. The distance between the electrodes is 80 mm. The total length of the tube is 86 mm. The discharge tube C has a structure as shown in FIG.
Lead-in wire 3 made of Kovar metal with a sealing part length of 2 mm
And a rod-shaped electrode 4 made of tungsten having an outer diameter of 0.8 mm and a length of 3 mm.
mm, the total length is 86 mm.
【００１８】図４から明らかなように、放電管Ｂと放電
管Ｃとは管電圧はほぼ同じであった。一方、放電管Ａ
は、放電管Ｂよりもさらに管電圧を約３０Ｖ低減できる
ことが確認された。ここで、放電管の中央部の輝度は電
極の形態によらず全て３５０００ｃｄ／ｍ2であったの
で、放電管Ａは、放電管Ｂに比べ約１０％、放電管Ｃに
比べ約１５％発光効率が向上することがわかった。As apparent from FIG. 4, the discharge tubes B and C had substantially the same tube voltage. On the other hand, discharge tube A
It has been confirmed that can reduce the tube voltage by about 30 V as compared with the discharge tube B. Here, the luminance of the central portion of the discharge tube was 35,000 cd / m 2 irrespective of the form of the electrode, so that the discharge tube A emitted about 10% of the discharge tube B and emitted about 15% of the discharge tube C. It was found that the efficiency was improved.
【００１９】なお、電子放射体８を構成する材料として
Ｌａ0.5Ｓｒ0.5ＭｎＯ3を用いたが、ペロブスカイト型
の結晶構造を有する金属酸化物であれば他の組成比や元
素であってもよい。また、例えばＬａ2Ｏ3-X（但し０≦
ｘ＜３）などペロブスカイト型の結晶構造を有さない他
の金属酸化物でもよい。Although La 0.5 Sr 0.5 MnO 3 is used as a material constituting the electron emitter 8, other composition ratios and elements may be used as long as they are metal oxides having a perovskite crystal structure. Also, for example, La 2 O 3-X (where 0 ≦
Other metal oxides having no perovskite-type crystal structure such as x <3) may be used.
【００２０】また、水銀合金部材７として、水銀を含む
金属、化合物または混合物を用いてもよい。As the mercury alloy member 7, a metal, compound or mixture containing mercury may be used.
【００２１】本発明の第３の実施の形態の放電管は、図
５に示すように金属キャップ６の内面に電子放射体８を
塗布したものである。この構成によれば、従来の放電管
よりも発光効率を向上させることができる。The discharge tube according to the third embodiment of the present invention has an electron emitter 8 applied to the inner surface of a metal cap 6 as shown in FIG. According to this configuration, the luminous efficiency can be improved as compared with the conventional discharge tube.
【００２２】本発明の第４の実施の形態の放電管は、図
６に示すように電子放射体８を中空部を有さない焼結体
の形で収納させたものである。この構成によれば、従来
の放電管よりも発光効率を向上させることができる。In the discharge tube according to the fourth embodiment of the present invention, as shown in FIG. 6, an electron emitter 8 is housed in the form of a sintered body having no hollow portion. According to this configuration, the luminous efficiency can be improved as compared with the conventional discharge tube.
【００２３】本発明の第５の実施の形態の放電管は、図
７に示すように電子放射体８を細い棒状に形成した焼結
体を、金属キャップ６の軸中心に備えたものである。こ
の構成によれば、従来の放電管よりも発光効率を向上さ
せることができる。The discharge tube according to the fifth embodiment of the present invention is provided with a sintered body in which an electron emitter 8 is formed in a thin rod shape as shown in FIG. . According to this configuration, the luminous efficiency can be improved as compared with the conventional discharge tube.
【００２４】本発明の第６の実施の形態の放電管は、図
８に示すように金属キャップ６をガラス管５に外接して
封着したものである。この構成によれば、従来の放電管
よりも発光効率を向上させることができる。The discharge tube according to the sixth embodiment of the present invention has a structure in which a metal cap 6 is circumscribed and sealed to a glass tube 5 as shown in FIG. According to this configuration, the luminous efficiency can be improved as compared with the conventional discharge tube.
【００２５】本発明は蛍光放電管だけでなく、キセノン
フラッシュ放電管など、他の放電管にも実施することが
できる。The present invention can be applied not only to a fluorescent discharge tube but also to other discharge tubes such as a xenon flash discharge tube.
【００２６】[0026]
【発明の効果】以上のように、本発明の放電管によれ
ば、従来の放電管に比べて非発光部の長さを短縮するこ
とができ、発光効率を向上させることができる。As described above, according to the discharge tube of the present invention, the length of the non-light emitting portion can be shortened as compared with the conventional discharge tube, and the luminous efficiency can be improved.
【００２７】また、本発明の放電管によれば、金属キャ
ップ内に仕事関数の低い電子放射体を備えることによ
り、電極からの電子放射効率を高めて陰極降下電圧を低
減させることができるため、従来よりも管電圧、管電力
を低減させることができ、発光効率を向上させることが
できる。Further, according to the discharge tube of the present invention, by providing the electron emitter having a low work function in the metal cap, the electron emission efficiency from the electrode can be increased and the cathode drop voltage can be reduced. The tube voltage and the tube power can be reduced as compared with the related art, and the luminous efficiency can be improved.
【図１】本発明の第１の実施の形態における放電管の断
面図FIG. 1 is a cross-sectional view of a discharge tube according to a first embodiment of the present invention.
【図２】本発明の第１の実施の形態における放電管と従
来の放電管の点灯時における管軸方向の輝度分布を示す
図FIG. 2 is a diagram showing a luminance distribution in a tube axis direction at the time of lighting of the discharge tube according to the first embodiment of the present invention and a conventional discharge tube.
【図３】本発明の第２の実施の形態における放電管の要
部断面図FIG. 3 is a sectional view of a main part of a discharge tube according to a second embodiment of the present invention.
【図４】本発明の第１の実施の形態における放電管、同
第２の実施の形態における放電管および従来の放電管の
点灯時における管電流と管電圧との関係を示した図FIG. 4 is a diagram showing the relationship between the tube current and the tube voltage when the discharge tube according to the first embodiment of the present invention, the discharge tube according to the second embodiment, and the conventional discharge tube are turned on.
【図５】本発明の第３の実施の形態における放電管の要
部断面図FIG. 5 is a sectional view of a main part of a discharge tube according to a third embodiment of the present invention.
【図６】同第４の実施の形態における放電管の要部断面
図FIG. 6 is a sectional view of a main part of a discharge tube in the fourth embodiment.
【図７】同第５の実施の形態における放電管の要部断面
図FIG. 7 is a sectional view of a main part of a discharge tube in the fifth embodiment.
【図８】同第６の実施の形態における放電管の要部断面
図FIG. 8 is a sectional view of a main part of a discharge tube in the sixth embodiment.
【図９】従来の放電管の部分断面図FIG. 9 is a partial sectional view of a conventional discharge tube.
１ 蛍光体 ５ ガラス管 ６ 金属キャップ ７ 水銀合金部材 ８ 電子放射体 Reference Signs List 1 phosphor 5 glass tube 6 metal cap 7 mercury alloy member 8 electron emitter
Claims (5)
に開口部を備え、他端に閉塞部を備えた金属キャップと
を有し、前記金属キャップの開口部側が前記ガラス管の
各開口部に封着されていることを特徴とする放電管。1. A glass tube having an opening at both ends and a metal cap having an opening at one end and a closing portion at the other end, wherein the opening side of the metal cap is each opening of the glass tube. Discharge tube characterized by being sealed in a part.
管の各開口部の内側に挿入されて、このガラス管の両端
に封着されていることを特徴とする請求項１記載の放電
管。2. The discharge tube according to claim 1, wherein an opening of the metal cap is inserted inside each opening of the glass tube and sealed at both ends of the glass tube.
プの開口部の内側に挿入されて、前記金属キャップの開
口部側が前記ガラス管の両端に封着されていることを特
徴とする請求項１記載の放電管。3. An opening of the glass tube is inserted inside an opening of the metal cap, and the opening side of the metal cap is sealed to both ends of the glass tube. The discharge tube according to claim 1.
備えたことを特徴とする請求項２または３記載の放電
管。4. The discharge tube according to claim 2, wherein an electron emitter is provided on an inner surface of the metal cap.
晶構造を有する金属酸化物からなることを特徴とする請
求項４記載の放電管。5. The discharge tube according to claim 4, wherein said electron emitter is made of a metal oxide having a perovskite crystal structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08848998A JP3970418B2 (en) | 1998-04-01 | 1998-04-01 | Discharge tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08848998A JP3970418B2 (en) | 1998-04-01 | 1998-04-01 | Discharge tube |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003063321A Division JP3970788B2 (en) | 2003-03-10 | 2003-03-10 | Discharge tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11288686A true JPH11288686A (en) | 1999-10-19 |
| JP3970418B2 JP3970418B2 (en) | 2007-09-05 |
Family
ID=13944229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08848998A Expired - Fee Related JP3970418B2 (en) | 1998-04-01 | 1998-04-01 | Discharge tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3970418B2 (en) |
-
1998
- 1998-04-01 JP JP08848998A patent/JP3970418B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3970418B2 (en) | 2007-09-05 |
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