JPH01248453A - Cold-cathode discharge lamp - Google Patents
Cold-cathode discharge lampInfo
- Publication number
- JPH01248453A JPH01248453A JP7442988A JP7442988A JPH01248453A JP H01248453 A JPH01248453 A JP H01248453A JP 7442988 A JP7442988 A JP 7442988A JP 7442988 A JP7442988 A JP 7442988A JP H01248453 A JPH01248453 A JP H01248453A
- Authority
- JP
- Japan
- Prior art keywords
- discharge
- cylinder
- truncated cone
- hollow truncated
- 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.)
- Pending
Links
- 239000011521 glass Substances 0.000 claims abstract description 9
- 239000007769 metal material Substances 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Discharge Lamp (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は放電電極の構造を変更することによって特性を
向上させた冷陰極放電ランプに関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cold cathode discharge lamp whose characteristics are improved by changing the structure of the discharge electrode.
（従来の技術）
液晶テレビなどの液晶表示装置のバックライトなどに細
径の蛍光ランプを使用したものがある。(Prior Art) There are devices that use small-diameter fluorescent lamps as backlights for liquid crystal display devices such as liquid crystal televisions.
上記用途の蛍光ランプには、放電電極として電子放射物
質な被着したコイル状の放電電極を使用する熱陰極形と
、熱陰極を使用せずニッケルなどの金属などを電極とし
た冷陰極形放電ランプがある。Fluorescent lamps for the above applications are of the hot cathode type, which uses a coiled discharge electrode coated with an electron-emitting material as the discharge electrode, and the cold cathode type, which does not use a hot cathode but uses a metal such as nickel as an electrode. There's a lamp.
上記熱陰極形の放電ランプは電極降下電圧が低く光効率
が高いが、ランプ製造時に電極を加熱して電極に被着さ
れた電子放射物質を活性化する必要があり、また上記電
子放射物質の電極への被着量によってランプ寿命が規制
され１通例２，０００時間前後の寿命であり、またラン
プ電流が小さいと放電電極のたとえばタングステンコイ
ルフィラメントが著しく細くなって加工性が悪く断線し
やすい問題があった。The above-mentioned hot cathode discharge lamp has low electrode drop voltage and high light efficiency, but it is necessary to heat the electrodes during lamp manufacture to activate the electron emitting material deposited on the electrodes, and Lamp life is regulated by the amount of adhesion on the electrodes, and typically lasts around 2,000 hours.Additionally, when the lamp current is small, the discharge electrode, such as a tungsten coil filament, becomes extremely thin, resulting in poor workability and a tendency to break. was there.
冷陰極放電ランプの場合９本発明者の実験によれば、放
電電極の表面積をＳ （ｘ４） 、ランプ電流を工ｔ
（ｍＡ）とすると、Ｓ≧Ｉ４１０．０４７を満足する電
極表面積を有する放電電極の時、放電の正規グローが維
持される。上記実験式はクラウドの式とほぼ一致する。In the case of a cold cathode discharge lamp9 According to the inventor's experiments, the surface area of the discharge electrode is S (x4), and the lamp current is t.
(mA), a normal discharge glow is maintained when the discharge electrode has an electrode surface area that satisfies S≧I410.047. The above empirical formula almost agrees with Cloud's formula.
したがってＳがＩｔｌｏ、０４７より小さいと正規グロ
ーが異常グローになり、電極降下電圧が著しく高くなり
、著しく低効率となってしまう。Therefore, if S is smaller than Itlo, 047, the normal glow becomes abnormal glow, the electrode drop voltage becomes extremely high, and the efficiency becomes extremely low.
上記の理由から、従来の上記冷陰極放電ランプは。For the above reasons, the above conventional cold cathode discharge lamps.
熱陰極のように電極の活性化の必要はなく、構造が簡単
でランプ寿命は長いが、電極面積がランプ電流によって
規制され、小形化が難しく効率も低い問題があった。Unlike hot cathodes, there is no need to activate the electrode, the structure is simple, and the lamp life is long, but the electrode area is limited by the lamp current, making it difficult to downsize and having low efficiency.
（発明が解決しようとする課題） 上記したように、従来の冷陰極放電ランプは。(Problem to be solved by the invention) As mentioned above, conventional cold cathode discharge lamps.
放電電極の面積がランプ電流によって規制されるから、
小形でランプ電流の比較的大きい冷陰極放電ランプを構
成することが難しく効率を向上させることが難しい問題
があった。Since the area of the discharge electrode is regulated by the lamp current,
There has been a problem in that it is difficult to construct a cold cathode discharge lamp that is small and has a relatively large lamp current, and it is difficult to improve efficiency.
本発明は、上記問題点を防止する課題に対してなされた
もので、ランプ電流が大きくても効率を低下させること
なく正規グロー放電を維持でき。The present invention has been made to solve the above-mentioned problem, and can maintain normal glow discharge without reducing efficiency even when the lamp current is large.
光特性のよい改良された冷陰極放電ランプを提供するこ
とを目的とする。An object of the present invention is to provide an improved cold cathode discharge lamp with good optical characteristics.
（課題を解決するための手段）
本発明冷陰極放電ランプは、その放電電極が金属材料の
ガラスバルブ軸に沿った円筒形状で、上記円筒形に連接
して放電空間側から円筒内部に向かつて中空円錐台状に
細まった構成を有していることを特徴とする。(Means for Solving the Problems) In the cold cathode discharge lamp of the present invention, the discharge electrode is made of a metal material and has a cylindrical shape along the axis of the glass bulb, and is connected to the cylindrical shape and directed from the discharge space side to the inside of the cylinder. It is characterized by having a narrowed configuration in the shape of a hollow truncated cone.
（作用）
本発明冷陰極放電ランプはその放電電極が、ニッケルや
比較的仕事関数の低い金属や合金の円筒形状であって、
上記円筒形に連接して放電空間側から円筒の内部に向っ
て中空円錐台状に細まった構成になっている。したがっ
て１本発明冷陰極放電ランプが放電開始すると、その放
電は放電電極の円筒内部に向った中空円錐台の放電空間
に面した側から発生して放電電流の増加に伴って放電空
間側と反対側の中空円錐台の頂部の透孔内に入り込み、
さらに電流の増加に伴って放電電極全体が輝面となる。(Function) The cold cathode discharge lamp of the present invention has a cylindrical discharge electrode made of nickel or a metal or alloy with a relatively low work function,
It is connected to the cylindrical shape and tapers into a hollow truncated cone shape from the discharge space side toward the inside of the cylinder. Therefore, when the cold cathode discharge lamp of the present invention starts discharging, the discharge occurs from the side facing the discharge space of the hollow truncated cone facing the inside of the cylinder of the discharge electrode, and as the discharge current increases, the discharge occurs from the side facing the discharge space. It enters the through hole at the top of the hollow cone on the side,
Further, as the current increases, the entire discharge electrode becomes a bright surface.
すなわち、放電に関与する放電電極の面積が拡大し放電
電流が増加しても正規グロー域の放電が維持され効率が
低下せず、電極材料のスパッタが発生しない。さらに放
電電極が中空円錐台状に構成されているから、放電のプ
ラズマが中空円錐台付近に入り込みイオンや電子や光子
が放電電極を叩きホローカソード効果による発光が発生
し、さらに陽光柱が長くなるから光効率が数％向上する
。この現象は中空円錐台の頂部のみでなく９円錐台と円
筒とが連接される挟角部にも発生していると思われる。That is, even if the area of the discharge electrode involved in the discharge is expanded and the discharge current is increased, the discharge in the normal glow range is maintained, the efficiency does not decrease, and sputtering of the electrode material does not occur. Furthermore, since the discharge electrode is configured in the shape of a hollow truncated cone, the discharge plasma enters the vicinity of the hollow cone, and ions, electrons, and photons strike the discharge electrode, producing light emission due to the hollow cathode effect, further lengthening the solar column. The light efficiency improves by several percent. This phenomenon appears to occur not only at the top of the hollow truncated cone but also at the narrow corner where the 9-conical truncated cone and the cylinder are connected.
（実施例）
本発明冷陰極放電ランプの詳細を第１図および第２図に
示す実施例を参照して説明する。第１図は本発明冷隘極
放電ランプの一実施例の一部切欠゛正面図、第２図は同
じ実施例に使用される放電電極の円筒形状部分を拡大し
て示す断面図である。(Example) Details of the cold cathode discharge lamp of the present invention will be explained with reference to the example shown in FIGS. 1 and 2. FIG. 1 is a partially cutaway front view of an embodiment of the cold electrode discharge lamp of the present invention, and FIG. 2 is an enlarged cross-sectional view of a cylindrical portion of a discharge electrode used in the same embodiment.
ガラスバルブｔ１）の両端に放電電極（２）が封着され
ている。（３） 、 （３１・・・は放電電極（２）か
ら導出されるリード線である。放電電極（２）は上記リ
ード線（３）Ｋ第２図示の形状の構成がとりつけられて
いる。上記放電電極に）はガラスバルブ（１）の軸に沿
って、たとえばニッケルなどの金属材料の円筒（４）か
らなつ【おり。Discharge electrodes (2) are sealed at both ends of the glass bulb t1). (3), (31... are lead wires led out from the discharge electrode (2).The discharge electrode (2) has the configuration of the lead wire (3)K shown in the second figure. Along the axis of the glass bulb (1), a cylinder (4) of a metallic material, for example nickel, is connected to the discharge electrode.
上記円筒（４）の矢印で示す放電空間側の端部（５）か
ら円筒（４）の内部に向かって中空円錐台（６）が円筒
（４）に連設して設けられている。上記中空円錐台（６
）の円筒（４）と＾する端部（５）と反対側の頂部（７
）に透孔（８）が設けられている。前記したように、放
電が始まると中空円錐台（６）の放電空間側の端部（５
）から放電が発生し、放電電流の増加と共に中空円錐台
（６）の透孔（８）に放電が入り込み、ついには放電電
極（２）全体が輝面となる。第３図は従来の冷陰極放電
ランプの放電電極の一例の拡大断面図であって９円筒（
９）の放電電極（ＩＧの矢印で示す放電空間側の中央部
に透孔（１１）を設けた塊根Ｃ１２１が円筒形（９）に
連設して設けられており、この構造の電極によってもプ
ラズマのイオタ電子や光子が電極表面を叩き、ホローカ
ソード効果による発光が期待できるが、電極から放出さ
れる電子などが透孔（１１）の部位で高速になり透孔住
υの前面で速度の緩和域が形成され、見かけ上、負グロ
ーの様なグローが形成されて陽光柱が長くならない。こ
の様な現象は本発明に使用される形状の放電電極の中空
円錐台を、放電空間と反対側′から細まる様にとりつけ
た冷陰極放電ランプにおいても発生する。したがってこ
の様な冷陰極放電ランプは本発明の範鴫に属さない。A hollow truncated cone (6) is provided in succession to the cylinder (4) from the end (5) of the cylinder (4) on the discharge space side shown by the arrow toward the inside of the cylinder (4). The above hollow truncated cone (6
) of the cylinder (4) and the opposite end (5) and the top (7
) is provided with a through hole (8). As mentioned above, when the discharge starts, the end (5) of the hollow cone (6) on the discharge space side
), and as the discharge current increases, the discharge enters the through hole (8) of the hollow truncated cone (6), and finally the entire discharge electrode (2) becomes a bright surface. FIG. 3 is an enlarged sectional view of an example of a discharge electrode of a conventional cold cathode discharge lamp.
9) The discharge electrode (tubular root C121 with a through hole (11) provided in the central part on the discharge space side shown by the arrow IG is provided in series in a cylindrical shape (9), and the electrode with this structure also Iota electrons and photons from the plasma hit the electrode surface, and light emission can be expected due to the hollow cathode effect, but the electrons emitted from the electrode accelerate at the through hole (11), and the speed decreases at the front of the through hole (11). A relaxation zone is formed, and a glow that looks like a negative glow is formed, so that the positive column does not become long.This phenomenon causes the hollow truncated cone of the discharge electrode of the shape used in the present invention to become opposite to the discharge space. This phenomenon also occurs in cold cathode discharge lamps that are mounted so as to taper from the side. Therefore, such cold cathode discharge lamps do not fall within the scope of the present invention.
本発明者は第２図示の放電電極の円筒形の外径Ｌが３．
３ｍｌ＋高さｈが７朋２円筒を構成するニッケル板の厚
さ（がＱ、 １ ｍｒｎ ｒ 中空円錐台の透孔の内径
ｄが０．６５ｍｆｉ＃中空円錐台の母線ＡＢが円筒とな
す角θが１７°の放電電極を使用して本発明冷陰極放電
ランプを製造して試験した。その結果、従来の冷陰極放
電ランプより電極面積が約１．３倍ないし１．４倍にな
り、したがって１．３倍ないし１．４倍のランプ電流を
流しても、正規グロー域を維持することができ光効率が
よく陽光柱の長い輝度の高い冷陰極放電ランプが得られ
た。なお円筒に連接する中空円錐台は別体のものを円筒
端に溶接などによって接続しても、また円筒と一体にな
っていてもよい。The present inventor has determined that the outer diameter L of the cylindrical discharge electrode shown in the second figure is 3.
3 ml + height h is 7 h 2 Thickness of the nickel plate constituting the cylinder (is Q, 1 mrn r Inner diameter d of the through hole of the hollow truncated cone is 0.65 mfi # Angle θ between the generatrix AB of the hollow truncated cone and the cylinder A cold cathode discharge lamp of the present invention was manufactured and tested using a discharge electrode with a angle of 17°.As a result, the electrode area was approximately 1.3 to 1.4 times larger than that of a conventional cold cathode discharge lamp, and therefore Even when a lamp current of 1.3 to 1.4 times was applied, the normal glow range could be maintained, and a cold cathode discharge lamp with good light efficiency and high brightness with a long positive column was obtained.It was also connected to a cylinder. The hollow truncated cone may be a separate piece connected to the cylinder end by welding or the like, or it may be integrated with the cylinder.
以上詳述したように２本発明冷陰極放電ランプは放電電
極が金属材料からなり、ガラスバルブの軸に沿った円筒
形状で上記円筒形に連接して円筒形の放電空間側から円
筒内部に向かって中空円錐台状に細まって構成されてい
ることを特徴とし。As detailed above, in the two cold cathode discharge lamps of the present invention, the discharge electrode is made of a metal material, has a cylindrical shape along the axis of the glass bulb, and is connected to the cylindrical shape from the cylindrical discharge space side toward the inside of the cylinder. It is characterized by its narrow, hollow truncated cone shape.
ランプ電流を大きくすることができ、光効率の低下がな
く、正規グロー放電を確実に維持することができ光特性
の優れた冷陰極放電ランプを提供できる効果を有してい
る。The lamp current can be increased, the light efficiency does not decrease, a normal glow discharge can be reliably maintained, and a cold cathode discharge lamp with excellent optical characteristics can be provided.
第１図は本発明冷陰極放電ランプの一実施例の一部切欠
正面図、第２図は同じ実施例に使用される放電電極の円
筒形状部分を拡大して示す断面図。
第３図は従来の冷陰極放電ランプの放電電極の一例の拡
大断面図である。
（１）・・・・・・ガラスバルブ、（２）・・・・・・
放電電極。
（４）・・・・・・円筒、（５）・・・・・・端部。
（６）・・・・・・中空円錐台、（８）・・・・・・透
孔。FIG. 1 is a partially cutaway front view of an embodiment of the cold cathode discharge lamp of the present invention, and FIG. 2 is an enlarged cross-sectional view of a cylindrical portion of a discharge electrode used in the same embodiment. FIG. 3 is an enlarged sectional view of an example of a discharge electrode of a conventional cold cathode discharge lamp. (1)...Glass bulb, (2)...
discharge electrode. (4)...Cylinder, (5)...End. (6)...Hollow truncated cone, (8)...Through hole.
Claims (1)
おいて、上記放電電極は金属材料からなり、ガラスバル
ブの軸に沿つた円筒形状で、上記円筒形に連接して円筒
形の放電空間側から円筒内部に向かつて中空円錐台状に
細まつて構成されていることを特徴とする冷陰極放電ラ
ンプ。In a discharge lamp equipped with discharge electrodes at both ends of a glass bulb, the discharge electrodes are made of a metal material, have a cylindrical shape along the axis of the glass bulb, and are connected to the cylindrical shape to extend from the cylindrical discharge space side to the inside of the cylinder. A cold cathode discharge lamp characterized in that it is configured with a hollow truncated conical shape that narrows toward the front.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7442988A JPH01248453A (en) | 1988-03-30 | 1988-03-30 | Cold-cathode discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7442988A JPH01248453A (en) | 1988-03-30 | 1988-03-30 | Cold-cathode discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01248453A true JPH01248453A (en) | 1989-10-04 |
Family
ID=13546959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7442988A Pending JPH01248453A (en) | 1988-03-30 | 1988-03-30 | Cold-cathode discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01248453A (en) |
-
1988
- 1988-03-30 JP JP7442988A patent/JPH01248453A/en active Pending
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