JPH02236941A - Fluorescent lamp - Google Patents
Fluorescent lampInfo
- Publication number
- JPH02236941A JPH02236941A JP5643089A JP5643089A JPH02236941A JP H02236941 A JPH02236941 A JP H02236941A JP 5643089 A JP5643089 A JP 5643089A JP 5643089 A JP5643089 A JP 5643089A JP H02236941 A JPH02236941 A JP H02236941A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- tungsten
- wire
- 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
Links
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 abstract description 8
- 239000010937 tungsten Substances 0.000 abstract description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000956 alloy Substances 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 229910052697 platinum Inorganic materials 0.000 abstract description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 239000012467 final product Substances 0.000 abstract 1
- 239000011800 void material Substances 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910019589 Cr—Fe Inorganic materials 0.000 description 1
- 230000004397 blinking Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Discharge Lamp (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は液晶用のバックライトとして使用される蛍光ラ
ンプの電極構造に関する．
〔従来の技術〕
従来の蛍光ランプの電極構造はタングステン線を２重コ
イル状あるいは３重コイル状としたものにＢａ，Ｃａ，
Ｓｒ等の３元系からなるオキサイドをコイル内に充填含
浸させるという構造が一般的であった．
このような装ｎとして例えば実開昭６２−６６１５８号
がある．
〔発明が解決しようとする課題〕
上記従来技術は最近バックライトとして使用されている
高周波のインバータ回路にてフィラメントの予熱を行な
わないでいきなり点灯させる方法で点灯すると，点滅の
繰り返しですぐにフィラメントが切れてしまうという問
題があり、切れにくい構造の電極が望まれていた．
また、２重コイルもしくは３重コイルではタングステン
線を巻きつける必要があり，バックライトのように非常
に小さいランプ電流で使用する場合，フィラメントに使
用するタングステン線も極めて細い線となるために，フ
ィラメント製作時の巻きつけ作業において，線が切れや
すく、歩留が悪いという問題もあった．
本発明の目的は上記ランプにした時にすぐ切れてしまう
欠点、フィラメント製作時の断線による歩留低下等のな
い新規な電極構造を提供する．〔課題を解決するための
手段〕
上記目的を達成するために、１本の太いタングステン線
に極細タングステンをわたがし状に巻きつけ，その極細
タングステンの間隙に電子放射物質を含浸させる構造と
したものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrode structure of a fluorescent lamp used as a backlight for a liquid crystal display. [Prior Art] The electrode structure of conventional fluorescent lamps consists of a double or triple coiled tungsten wire with Ba, Ca,
A common structure was to fill and impregnate the coil with a ternary oxide such as Sr. An example of such a design is Utility Model Application No. 62-66158. [Problems to be Solved by the Invention] In the above conventional technology, when the high-frequency inverter circuit used for backlights is turned on suddenly without preheating the filament, the filament quickly burns out due to repeated blinking. There was a problem with the electrode breaking, so an electrode with a structure that would not easily break was desired. In addition, with double or triple coils, it is necessary to wind the tungsten wire, and when used with a very small lamp current such as in a backlight, the tungsten wire used for the filament is also extremely thin. There was also the problem that the wire easily broke during the winding process during production, resulting in poor yields. The object of the present invention is to provide a novel electrode structure that does not have the disadvantage of easily breaking when used as a lamp, or a decrease in yield due to breakage during filament production. [Means for solving the problem] In order to achieve the above object, a structure is adopted in which ultra-fine tungsten is wrapped around a single thick tungsten wire in a wadding shape, and the gaps between the ultra-fine tungsten are impregnated with an electron-emitting substance. be.
さらに、極細タングステン状の形成方法はねたがし状で
なくともよく、例えば直方体状，三角錐状，円柱状，円
錐状等どんな形に形成しても目的は達成することができ
る。Further, the method for forming the ultra-fine tungsten shape does not have to be in the form of a rectangle; for example, the purpose can be achieved by forming it in any shape such as a rectangular parallelepiped, triangular pyramid, cylinder, or cone.
更に、電子放射物質の他にＮｉ，Ｚｒ，Ｙ等の非較的仕
事関数の大きい金属とＢａ系の炭酸塩を混ぜて上記タン
グステン線条に塗布した後、１０００℃以上の温度で焼
結させることにより、比較的仕事関数の大きい、冷陰極
蛍光ランプ用として良好な性能の電極が得られる．
本発明の電極を使用することで、通常冷陰極放電の場合
１３０〜１５０Ｖ程度ある陰極降下電圧を７０〜８０ｖ
程度まで小さく出来るので効率の良い冷陰極蛍光ランプ
用の電極としても使用できる。Furthermore, in addition to the electron emitting material, a metal with a relatively large work function such as Ni, Zr, and Y and a Ba-based carbonate are mixed and applied to the tungsten wire, followed by sintering at a temperature of 1000°C or higher. As a result, an electrode with a relatively large work function and good performance for cold cathode fluorescent lamps can be obtained. By using the electrode of the present invention, the cathode drop voltage, which is usually about 130 to 150 V in cold cathode discharge, can be reduced to 70 to 80 V.
Since it can be made as small as possible, it can also be used as an electrode for highly efficient cold cathode fluorescent lamps.
極細タングステン線は、コイル状のフィラメントと同様
な働きをするが、たとえランプ点灯中に輝点として形成
されている部分が切れても、何らランプの点灯に影響す
ることがないので、繰返し点滅に対して強い電極となる
。Ultra-thin tungsten wire works in the same way as a coiled filament, but even if the part that forms a bright spot breaks while the lamp is lit, it will not affect the lamp's lighting in any way, so it will not cause repeated flashing. It becomes a strong electrode.
また、電極として、太いタングステン線に極細タングス
テンを形成させる場合に、例えば溶接等で形成させるな
らば、極細タングステン線の途中での接断に対しても、
歩留には何ら関係のない電極構造といえる。In addition, when forming ultra-fine tungsten on a thick tungsten wire as an electrode, for example, if it is formed by welding, etc., even if the ultra-fine tungsten wire breaks in the middle,
It can be said that the electrode structure has no relation to yield.
以下、本発明の実施例を図により説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の蛍光ランプ用電極の構造を示すもので
ある。FIG. 1 shows the structure of an electrode for a fluorescent lamp according to the present invention.
タングステン線０．５ＭＧ（０．５ｍｇ／２０ｏｎ）の
極細線１をｌｍｉ度とり、これを直径５ ｍ ，高さ７
Ｉ程度の円すい形状にまるめ、Ｂａ，Ｃａ，Ｓｒ系の炭
酸塩を塗布させた。更に１２００℃×１分間、Ｎｚ中で
の焼結を行なった。２はやはりタングステンからなる太
腺であり，このタングステン線２に白金３を介して、Ｎ
ｉ − Ｃ ｒ − Ｆ ｅからなる４２６合金（東
芝製）４を溶接し電極を構成する．４２６合金４はソー
ダライムガラスと熱膨張係数がほぼ同じように設定され
ているためガラスとのなじみが良い．
第２図は本発明の蛍光ランプを示したものであり、ガラ
ス管５の内面には蛍光体６があり、内部に水銀７が封入
されると共に、希ガスＡｒが１２Ｔｏｒｒ封入されてい
る。ランプの寸法を外径８ ｎｎ ，長さ３８ｍｍとし
、高周波点灯のインバータで点灯すると、ランプ電圧３
５ｖ，ランプ電流２ ０ ｍ Ａとなった。A tungsten wire 0.5MG (0.5mg/20on) ultra-fine wire 1 was taken at lmi degree and was made into a wire with a diameter of 5 m and a height of 7.
It was rounded into a conical shape of about I size and coated with Ba, Ca, and Sr based carbonates. Furthermore, sintering in Nz was performed at 1200° C. for 1 minute. 2 is a thick wire made of tungsten, and N is connected to this tungsten wire 2 through platinum 3.
426 alloy (manufactured by Toshiba) made of i-Cr-Fe is welded to form an electrode. 426 Alloy 4 has almost the same thermal expansion coefficient as soda lime glass, so it is compatible with glass. FIG. 2 shows a fluorescent lamp of the present invention, in which a phosphor 6 is provided on the inner surface of a glass tube 5, mercury 7 is sealed inside, and a rare gas Ar is sealed at 12 Torr. If the dimensions of the lamp are 8 nn in outer diameter and 38 mm in length, and the lamp is lit with a high-frequency inverter, the lamp voltage will be 3.
5V, lamp current 20 mA.
本発明のランプを使用することにより、従来は電源のオ
ン・オフのくり返しによる点滅寿命は１万回前後であっ
たが、本発明のランプでは５万回以上の点滅寿命である
ことを確認した。By using the lamp of the present invention, it has been confirmed that the lamp of the present invention has a lifespan of more than 50,000 blinks, whereas conventional lamps had a lifespan of around 10,000 blinks due to repeated power on/off cycles. .
更に、ランプ電流を５ｍＡにすると冷陰極放電で点灯し
，ランプ電圧が１０５ｖであることも確認し、冷陰極用
電極をも兼用することが確認できた。Furthermore, when the lamp current was set to 5 mA, it was lit by cold cathode discharge, and it was confirmed that the lamp voltage was 105 V, confirming that it also served as a cold cathode electrode.
電極の構造として、例えば円柱，直方性，チクワ状等で
も試作したが、同様の性能であることは言うまでもない
。Experiments were also made with electrode structures such as cylindrical, rectangular, and prickly, and it goes without saying that the performance was similar.
本発明によれば、極細タングステン線を簡単な型に入れ
て成形すればどんな形の電極を作ることが出きる上に、
Ｂａ系のオキサイドの形成は高温での焼結で簡単に形成
できる．
更に，本電極を熱陰極用としても冷陰極用としても使用
出来、電極オン・オフの繰り返しに強いランプを提供す
ることが出来る。According to the present invention, electrodes of any shape can be made by placing an ultra-fine tungsten wire in a simple mold and molding it.
Ba-based oxide can be easily formed by sintering at high temperatures. Furthermore, this electrode can be used both as a hot cathode and as a cold cathode, making it possible to provide a lamp that is resistant to repeated turning on and off of the electrode.
第１図は本発明のｔ？！極構造の一実施例を示す斜視図
，第２図は本発明の電極を用いた蛍光ランプの構造を示
す部分断面図である．
１・・・極細タングステン線、２・・・タングステン線
、３・・・白金、４・・・４２６合金、５・・・ガラス
管、６・・・蛍光体，７・・・水銀．Figure 1 shows the t? ! FIG. 2 is a perspective view showing an embodiment of the electrode structure, and FIG. 2 is a partial sectional view showing the structure of a fluorescent lamp using the electrode of the present invention. DESCRIPTION OF SYMBOLS 1... Extrafine tungsten wire, 2... Tungsten wire, 3... Platinum, 4... 426 alloy, 5... Glass tube, 6... Phosphor, 7... Mercury.
Claims (1)
射物質とからなる電極を有してなることを特徴とする蛍
光ランプ。1. A fluorescent lamp characterized by having an electrode consisting of a mass of tungsten wire and an electron-emitting material in the gap between the mass of tungsten wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5643089A JPH02236941A (en) | 1989-03-10 | 1989-03-10 | Fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5643089A JPH02236941A (en) | 1989-03-10 | 1989-03-10 | Fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02236941A true JPH02236941A (en) | 1990-09-19 |
Family
ID=13026874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5643089A Pending JPH02236941A (en) | 1989-03-10 | 1989-03-10 | Fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02236941A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0584858A1 (en) * | 1992-08-10 | 1994-03-02 | Koninklijke Philips Electronics N.V. | Low pressure discharge lamp having sintered "cold cathode" discharge electrodes |
| EP0584859A1 (en) * | 1992-08-10 | 1994-03-02 | Koninklijke Philips Electronics N.V. | Discharge lamps with composite electrodes and method of installation of these electrodes in the lamps |
-
1989
- 1989-03-10 JP JP5643089A patent/JPH02236941A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5585694A (en) * | 1990-12-04 | 1996-12-17 | North American Philips Corporation | Low pressure discharge lamp having sintered "cold cathode" discharge electrodes |
| EP0584858A1 (en) * | 1992-08-10 | 1994-03-02 | Koninklijke Philips Electronics N.V. | Low pressure discharge lamp having sintered "cold cathode" discharge electrodes |
| EP0584859A1 (en) * | 1992-08-10 | 1994-03-02 | Koninklijke Philips Electronics N.V. | Discharge lamps with composite electrodes and method of installation of these electrodes in the lamps |
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