JPH05275059A - Cold cathode fluorescent lamp - Google Patents

Cold cathode fluorescent lamp

Info

Publication number
JPH05275059A
JPH05275059A JP7067492A JP7067492A JPH05275059A JP H05275059 A JPH05275059 A JP H05275059A JP 7067492 A JP7067492 A JP 7067492A JP 7067492 A JP7067492 A JP 7067492A JP H05275059 A JPH05275059 A JP H05275059A
Authority
JP
Japan
Prior art keywords
cold cathode
bulb
metal
lamp
fluorescent lamp
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.)
Pending
Application number
JP7067492A
Other languages
Japanese (ja)
Inventor
Masayuki Kobayashi
誠之 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Lighting and Technology Corp
Original Assignee
Toshiba Lighting and Technology Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Priority to JP7067492A priority Critical patent/JPH05275059A/en
Publication of JPH05275059A publication Critical patent/JPH05275059A/en
Pending legal-status Critical Current

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  • Discharge Lamp (AREA)

Abstract

PURPOSE:To provide a cold cathode phosphorus lamp, which does not need a special sealing shape or a stem, and by which the effective emission length can be increased to the length of the lamp. CONSTITUTION:The end part of a bulb 1 is closed by a cylindrical cold cathode 3, and the inner surface of the cold cathode is formed of a metal 31 of low cold cathode drop voltage, while the outer surface thereof is formed of a metal 34 whose coefficient of thermal expansion is close to that of the bulb, and the outer surface is connected to the bulb. Since the end part of the bulb is closed by the cold cathode, a special sealing shape or stem is omitted, and since the front end of the cold cathode is not protruded to a large degree to the discharge space, the effective emission length can be increased. Since the inner surface of the cold cathode fluorescent lamp is formed of a metal of low cathode drop voltage, the electrode characteristic is good, while peeling or a crack of the bulb can be prevented, since the outer surface is formed of a metal whose coefficient of thermal expansion is close to that of the bulb.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、液晶表示素子のバック
ライト等に好適する細管形の冷陰極けい光ランプに関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-tube cold cathode fluorescent lamp suitable for a backlight of a liquid crystal display device.

【0002】[0002]

【従来の技術】最近、液晶を用いた表示技術が急速に進
歩しており、これに伴い液晶表示装置の小形化が進んで
いる。一般に、液晶表示板は背面からバックライトによ
り照射するようになっており、上記液晶表示装置の小形
化はバックライトの小形化を必要とする。
2. Description of the Related Art Recently, display technology using liquid crystals has been rapidly advanced, and accordingly, liquid crystal display devices have been miniaturized. Generally, the liquid crystal display panel is designed to illuminate from the back side with a backlight, and miniaturization of the liquid crystal display device requires miniaturization of the backlight.

【0003】この種の液晶表示装置のバックライトとし
ては、発熱が少なく、高効率であり、発光長が長い等の
理由から冷陰極けい光ランプが使用されている。そし
て、小形液晶表示装置に対応させるため、この種の冷陰
極けい光ランプにおけるランプ長を短くすることが要求
されている。
As a backlight of this type of liquid crystal display device, a cold cathode fluorescent lamp is used because of its low heat generation, high efficiency, and long light emission length. In order to support a small liquid crystal display device, it is required to shorten the lamp length in this type of cold cathode fluorescent lamp.

【0004】従来のランプでは、バルブの端部に冷陰極
を封装する場合、バルブの端部にバルブと一体の封止部
を形成したり、別個に形成したステムを封着し、これら
封止部やステムにリード線を気密に貫通し、このリード
線の先端に山形または円筒形の冷陰極を接続する構造が
採用されていた。
In the conventional lamp, when the cold cathode is sealed at the end of the bulb, a sealing portion integral with the bulb is formed at the end of the bulb, or a separately formed stem is sealed, and these seals are formed. A structure has been adopted in which a lead wire is hermetically penetrated through a portion or a stem, and a mountain-shaped or cylindrical cold cathode is connected to the tip of the lead wire.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、このよ
うな電極の取着構造は、バルブの端部に格別な封止部や
ステムを設ける必要があるから封止作業が面倒になる不
具合があり、また冷陰極が封止部やステムを貫通された
リード線の先端に接続されているから冷陰極の先端が封
止部から放電空間側に大きく突出し、したがって冷陰極
の背部に位置する非発光部の長さが大きくなり、ランプ
全長に対する有効発光長の占める長さが短かくなる欠点
があった。このため、ランプが有効発光長に比して相対
的に大形になる欠点がある。
However, such an electrode attachment structure has a problem that the sealing work is troublesome because it is necessary to provide a special sealing portion or stem at the end of the valve. Further, since the cold cathode is connected to the tip of the lead wire penetrating the sealing portion or the stem, the tip of the cold cathode largely projects from the sealing portion to the discharge space side, and thus the non-light emitting portion located at the back of the cold cathode. Has a drawback that the effective light emission length occupies a short portion of the total lamp length. Therefore, there is a drawback that the lamp becomes relatively large compared to the effective light emission length.

【0006】本発明はこのような事情にもとづきなされ
たもので、その目的とするところは、格別な封止形状や
ステムを用いる必要がないとともに、ランプ長に対する
有効発光長を大きくすることができる冷陰極けい光ラン
プを提供しようとするものである。
The present invention has been made in view of the above circumstances. The object of the present invention is to eliminate the need for using a special sealing shape or stem and to increase the effective light emission length with respect to the lamp length. It is intended to provide a cold cathode fluorescent lamp.

【0007】[0007]

【課題を解決するための手段】本発明は、バルブの開口
端部を円筒形の冷陰極で閉塞し、この円筒形冷陰極は、
内面が陰極降下電圧の低い金属で形成されるとともに、
外面がバルブと熱膨脹率の近似した金属により形成さ
れ、この冷陰極の外面をバルブに融着して接合したこと
を特徴とする。
According to the present invention, the open end of a bulb is closed by a cylindrical cold cathode, and the cylindrical cold cathode comprises:
The inner surface is made of metal with a low cathode drop voltage,
The outer surface is formed of a metal having a coefficient of thermal expansion similar to that of the bulb, and the outer surface of the cold cathode is fused and bonded to the bulb.

【0008】[0008]

【作用】本発明によると、バルブの端部が冷陰極により
閉止されるから、つまり冷陰極がステムを兼用するから
格別な圧潰封止やガラスステムが不要になり、また冷陰
極の先端が放電空間に向かって大きく突出しないから有
効発光長さを大きくするこができる。しかも、上記冷陰
極は円筒形の内面が陰極降下電圧の低い金属で形成され
ているから電極特性が良好であり、かつ外面がバルブと
熱膨脹率の近似した金属により形成されているから、剥
がれやバルブのクラックを防止することができる。
According to the present invention, since the end of the bulb is closed by the cold cathode, that is, the cold cathode doubles as the stem, no special crush sealing or glass stem is required, and the tip of the cold cathode is discharged. The effective light emission length can be increased because it does not significantly project toward the space. Moreover, since the cold cathode has a cylindrical inner surface made of a metal having a low cathode drop voltage, it has good electrode characteristics, and the outer surface is made of a metal having a coefficient of thermal expansion close to that of the bulb. It is possible to prevent cracks in the valve.

【0009】[0009]

【実施例】以下本発明について、図面に示す一実施例に
もとづき説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings.

【0010】図1において1はバルブであり、外径が3
〜4.5mm程度の細径をなしており、全長が50〜30
0mmの直管形ガラスチューブにより形成されている。バ
ルブ1の内面にはけい光体被膜2が形成されているとと
もに、両端部には冷陰極3、3が封装されている。
In FIG. 1, reference numeral 1 is a valve having an outer diameter of 3
It has a small diameter of ~ 4.5mm and the total length is 50 ~ 30.
It is made of a straight glass tube of 0 mm. A fluorescent coating 2 is formed on the inner surface of the bulb 1, and cold cathodes 3, 3 are sealed at both ends.

【0011】上記冷陰極3、3は外径2.0〜3.5mm
程度の空洞をなした円筒形であり、外部端部にはニッケ
ルNiワイヤなどからなる外部リード線4、4が突き合
わせ溶接等の手段で気密に閉塞するように接合されてい
る。
The cold cathodes 3 and 3 have an outer diameter of 2.0 to 3.5 mm.
The external lead wires 4 and 4 made of nickel Ni wire or the like are joined to the outer end portion by means of butt welding or the like so as to be airtightly closed.

【0012】なお、リード線4をニッケルワイヤNiに
より形成し、このリード線4の外径を円筒形冷陰極3の
内径に等しくしてこのリード線4の先端を円筒形冷陰極
3の端部にはめ込み、これらを加熱溶融して接合しても
よい。
The lead wire 4 is made of nickel wire Ni, the outer diameter of the lead wire 4 is made equal to the inner diameter of the cylindrical cold cathode 3, and the tip of the lead wire 4 is an end portion of the cylindrical cold cathode 3. They may be fitted in, and they may be melted by heating and joined.

【0013】上記円筒形冷陰極3は多層構造をなしてい
る。すなわち、この冷陰極3は、一番内側に位置する内
面がニッケルNi等のような陰極降下電圧の低いかつ放
電によりスパッタリングの発生が少ない金属31で形成
されており、この外側に鉄Fe32および銅Cu33を
数μmの層として形成し、一番外側の面がバルブガラス
と熱膨脹率の近似した金属34、例えば酸化銅CuO2
により形成されている。つまり、この冷陰極3は外側に
向かって次第にガラスの熱膨脹率に近似した金属となる
ような多層構造をなしており、その一番外側の二酸化銅
CuO2 34が、バルブ1の開口端部内面に溶融接合さ
れている。
The cylindrical cold cathode 3 has a multi-layer structure. That is, the cold cathode 3 has an inner surface located on the innermost side formed of a metal 31, such as nickel Ni, which has a low cathode drop voltage and is less likely to generate sputtering due to discharge. Cu33 is formed as a layer having a thickness of several μm, and the outermost surface thereof is a metal 34 having a coefficient of thermal expansion similar to that of the bulb glass, for example, copper oxide CuO 2
It is formed by. That is, the cold cathode 3 has a multi-layer structure in which the metal gradually approximates the coefficient of thermal expansion of glass toward the outside, and the outermost copper dioxide CuO 2 34 forms the inner surface of the opening end of the bulb 1. It is melt-bonded to.

【0014】このため、バルブ1の開口端は、冷陰極
3、3により気密に閉塞されている。なお、バルブ1内
には水銀とアルゴン、ネオンからなる混合ガス等の希ガ
スが封入されている。
Therefore, the open end of the bulb 1 is hermetically closed by the cold cathodes 3, 3. The bulb 1 is filled with a rare gas such as a mixed gas of mercury, argon and neon.

【0015】このような構成の冷陰極けい光ランプにお
いては、バルブ1の端部に冷陰極3、3を嵌合して加熱
するだけで冷陰極3、3がバルブ1に接合され、これに
よりバルブ1の開口端が冷陰極3、3により気密に閉塞
されているから、バルブ1の端部に格別な封止部を形成
したり、ガラスステムで閉止するなどの構造が不要とな
り、封止部を形成する工程やステム等の部品を削減する
ことができる。
In the cold cathode fluorescent lamp having such a structure, the cold cathodes 3 and 3 are joined to the bulb 1 only by fitting the cold cathodes 3 and 3 to the ends of the bulb 1 and heating them. Since the open end of the bulb 1 is airtightly closed by the cold cathodes 3 and 3, it is not necessary to form a special sealing portion at the end of the bulb 1 or to close it with a glass stem. It is possible to reduce the step of forming the portion and the parts such as the stem.

【0016】しかも、この場合冷陰極3、3は外側に向
かって次第にガラスの熱膨脹率に近似した金属となるよ
うな多層構造をなしており、その一番外側34の二酸化
銅CuO2 がバルブ1の開口端部内面に溶融接合されて
いるから、熱膨張差による剥がれや、バルブ1にクラッ
クが発生するのを防止することができる。また、空洞の
内面はニッケル層31により形成されているから放電が
安定して持続し、電極特性が良好に保たれる。
Moreover, in this case, the cold cathodes 3 and 3 have a multi-layer structure in which the metal gradually approximates the coefficient of thermal expansion of glass toward the outside, and the copper dioxide CuO 2 on the outermost side 34 is the bulb 1. Since it is melt-bonded to the inner surface of the opening end portion of the valve 1, it is possible to prevent peeling due to a difference in thermal expansion and cracking of the valve 1. Further, since the inner surface of the cavity is formed of the nickel layer 31, the discharge is stably maintained and the electrode characteristics are kept good.

【0017】そして、このような構成の場合、上記バル
ブ1の端部を閉塞する部材が電極を兼用しているから、
これら冷陰極3、3がバルブ1の端部から放電空間に向
けて突出する高さが低くてすみ、よってバルブ1の全長
Lに比べて有効発光長さlを割合として長くすることが
できる。このため、同じ有効発光長さlであれば、従来
に比べてバルブ長Lを短くすることができ、ランプの小
形化に有効となる。
In the case of such a structure, since the member for closing the end of the valve 1 also serves as the electrode,
The cold cathodes 3 and 3 need only have a low height to project from the end of the bulb 1 toward the discharge space, and therefore the effective light emission length 1 can be lengthened relative to the total length L of the bulb 1. Therefore, if the effective light emission length l is the same, the bulb length L can be shortened as compared with the conventional one, which is effective for downsizing the lamp.

【0018】なお、本発明は上記実施例に限らず、ラン
プの大きさは外径4.5mm以上出あってもよく、また直
管形ランプに限らず屈曲形ランプであっても実施可能で
ある。もちろん、液晶表示装置のバックライトに適用さ
れる冷陰極けい光ランプには限らず、ランプの用途は何
でもよい。さらに、冷陰極はガラス接着剤によりバルブ
に接合するようにしてもよい。
The present invention is not limited to the above embodiment, the lamp may have an outer diameter of 4.5 mm or more, and the invention is not limited to the straight tube lamp and can be a bent lamp. is there. Of course, the use of the lamp is not limited to the cold cathode fluorescent lamp applied to the backlight of the liquid crystal display device. Further, the cold cathode may be bonded to the bulb with a glass adhesive.

【0019】[0019]

【発明の効果】以上説明したように本発明によれば、バ
ルブの端部が冷陰極により閉止されるから、この冷陰極
がステムを兼用し、よって格別な封止形状やステムが不
要になり、封止構造が簡単になる。そして、バルブの端
部に冷陰極が接合されることから冷陰極の先端が放電空
間に向かって大きく突出しないようになり、有効発光長
さを大きくすることができ、同じ発光長さであれば従来
よりバルブを短くすることができ、ランプの小形化に有
効となる。しかも、上記冷陰極は円筒形の内面が陰極降
下電圧の低い金属で形成されているから電極特性が良好
であり、かつ外面がバルブの熱膨脹率に近似した金属に
より形成されているから、剥がれやバルブのクラックを
防止することができる。
As described above, according to the present invention, since the end portion of the bulb is closed by the cold cathode, this cold cathode also serves as the stem, so that no special sealing shape or stem is required. The sealing structure becomes simple. Then, since the cold cathode is joined to the end of the bulb, the tip of the cold cathode does not significantly project toward the discharge space, and the effective light emission length can be increased. The bulb can be made shorter than before, which is effective for downsizing the lamp. Moreover, the cold cathode has good electrode characteristics because the cylindrical inner surface is formed of a metal having a low cathode drop voltage, and the outer surface is formed of a metal close to the coefficient of thermal expansion of the bulb. It is possible to prevent the valve from cracking.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を示す冷陰極けい光ランプの
断面図。
FIG. 1 is a sectional view of a cold cathode fluorescent lamp showing an embodiment of the present invention.

【図2】(a)図は主要部の拡大した断面図、(b)図
は(a)図中B−B線の断面図である。
FIG. 2A is an enlarged sectional view of a main part, and FIG. 2B is a sectional view taken along line BB in FIG. 2A.

【符号の説明】[Explanation of symbols]

1…バルブ、3…冷陰極、4…リード線、31…ニッケ
ル層、32…鉄層、33…銅層、34…二酸化銅層。
1 ... Bulb, 3 ... Cold cathode, 4 ... Lead wire, 31 ... Nickel layer, 32 ... Iron layer, 33 ... Copper layer, 34 ... Copper dioxide layer.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 バルブの開口端部を円筒形の冷陰極で閉
塞し、この円筒形冷陰極は、内面が陰極降下電圧の低い
金属で形成されるとともに、外面がバルブと熱膨脹率の
近似した金属により形成され、この冷陰極の外面をバル
ブに接合したことを特徴とする冷陰極けい光ランプ。
1. An open end of a bulb is closed by a cylindrical cold cathode, the inner surface of which is made of a metal having a low cathode drop voltage, and the outer surface has a coefficient of thermal expansion similar to that of the bulb. A cold cathode fluorescent lamp, which is made of metal and has an outer surface bonded to a bulb.
【請求項2】 上記円筒形冷陰極は、外側に向かってガ
ラスの熱膨脹率に次第に近くなる多数の金属層によって
多層構造に形成したことを特徴とする請求項1に記載の
冷陰極けい光ランプ。
2. The cold cathode fluorescent lamp as claimed in claim 1, wherein the cylindrical cold cathode is formed in a multi-layered structure by a number of metal layers that gradually become closer to the coefficient of thermal expansion of glass toward the outside. ..
JP7067492A 1992-03-27 1992-03-27 Cold cathode fluorescent lamp Pending JPH05275059A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7067492A JPH05275059A (en) 1992-03-27 1992-03-27 Cold cathode fluorescent lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7067492A JPH05275059A (en) 1992-03-27 1992-03-27 Cold cathode fluorescent lamp

Publications (1)

Publication Number Publication Date
JPH05275059A true JPH05275059A (en) 1993-10-22

Family

ID=13438437

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7067492A Pending JPH05275059A (en) 1992-03-27 1992-03-27 Cold cathode fluorescent lamp

Country Status (1)

Country Link
JP (1) JPH05275059A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100355030B1 (en) * 2000-03-24 2002-10-05 금호전기주식회사 Structure of electrode for cold cathode fluorescent lamp
KR20040013263A (en) * 2002-08-05 2004-02-14 (주)썬테크 Cold cathode fluorescent lamp
KR20040043527A (en) * 2002-11-19 2004-05-24 코리아라이테크 주식회사 production method of electrode mount for cold cathode fluorescent lamp
CN100403488C (en) * 2001-03-28 2008-07-16 松下电器产业株式会社 Cold-cathode fluorescent lamp

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100355030B1 (en) * 2000-03-24 2002-10-05 금호전기주식회사 Structure of electrode for cold cathode fluorescent lamp
CN100403488C (en) * 2001-03-28 2008-07-16 松下电器产业株式会社 Cold-cathode fluorescent lamp
KR20040013263A (en) * 2002-08-05 2004-02-14 (주)썬테크 Cold cathode fluorescent lamp
KR20040043527A (en) * 2002-11-19 2004-05-24 코리아라이테크 주식회사 production method of electrode mount for cold cathode fluorescent lamp

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