JPH07111145A - Cold cathode low pressure discharge lamp - Google Patents
Cold cathode low pressure discharge lampInfo
- Publication number
- JPH07111145A JPH07111145A JP25552493A JP25552493A JPH07111145A JP H07111145 A JPH07111145 A JP H07111145A JP 25552493 A JP25552493 A JP 25552493A JP 25552493 A JP25552493 A JP 25552493A JP H07111145 A JPH07111145 A JP H07111145A
- Authority
- JP
- Japan
- Prior art keywords
- cold cathode
- cylindrical
- pressure discharge
- sintered body
- discharge 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.)
- Withdrawn
Links
- 239000011521 glass Substances 0.000 claims abstract description 28
- 229910000645 Hg alloy Inorganic materials 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000010953 base metal Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 abstract description 11
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 11
- 229910052753 mercury Inorganic materials 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- WAVVREKFUSALRV-UHFFFAOYSA-D [V+5].[V+5].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O Chemical compound [V+5].[V+5].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O WAVVREKFUSALRV-UHFFFAOYSA-D 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
Landscapes
- Discharge Lamp (AREA)
Abstract
(57)【要約】
【目的】 バックライトユニットの薄型，軽量，高輝
度，長寿命化，高効率化などが可能な、細管形の冷陰極
低圧放電灯の提供を目的とする。
【構成】 内壁面に蛍光体層が設けられ、かつ希ガスを
封有するガラス管４、および前記ガラス管４の両端部に
それぞれ封装された一対の冷陰極５を具備して成る冷陰
極低圧放電灯において、前記冷陰極５は対向面が開口す
る有底円筒状カップ5aと、この有底円筒状カップ5a内に
嵌合・配置されたベース金属粉末および電子放射性物質
を素材として成る筒状焼結体5bと、この筒状焼結体5bの
筒状空洞部内に嵌合・配置された水銀合金5cを含有・充
填したスリーブ5dとを具備して成り、かつ前記筒状焼結
体5bおよびスリーブ5dの先端面が有底円筒状カップ5a開
口端部より内側に位置された構成を成していることを特
徴とする。
(57) [Summary] [Objective] The purpose of the present invention is to provide a thin-tube cold-cathode low-pressure discharge lamp capable of achieving a thin, lightweight, high-brightness, long life, and high efficiency backlight unit. A cold cathode low-pressure discharge comprising a glass tube 4 provided with a phosphor layer on its inner wall surface and sealing a rare gas, and a pair of cold cathodes 5 sealed at both ends of the glass tube 4, respectively. In the electric lamp, the cold cathode 5 has a cylindrical cup 5a with a bottom having an opening on the opposite side, and a cylindrical baking made of a base metal powder and an electron emissive substance fitted and arranged in the cylindrical cup 5a with a bottom. And a sleeve 5d containing and filled with a mercury alloy 5c fitted and arranged in the cylindrical cavity of the cylindrical sintered body 5b, and the cylindrical sintered body 5b and The sleeve 5d is characterized in that the front end surface of the sleeve 5d is located inside the open end of the bottomed cylindrical cup 5a.
Description
【０００１】[0001]
【産業上の利用分野】本発明は冷陰極低圧放電灯に係
り、特に長寿命化など改善した放電冷陰極を具備して成
る細管型の冷陰極低圧放電灯に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold cathode low pressure discharge lamp, and more particularly to a thin tube cold cathode low pressure discharge lamp provided with a discharge cold cathode having an improved life.
【０００２】[0002]
【従来の技術】たとえば液晶バックライト用光源とし
て、冷陰極蛍光ランプ（冷陰極低圧放電灯）が一般的に
使用されており、このような用途に対して、図６ (a)，
(b)および図７ (a)， (b)にそれぞれ異なる要部構成を
断面的に示すような冷陰極蛍光ランプが提案されてい
る。すなわち、内壁面に紫外線による刺激で発光する蛍
光体層が設けられ、かつ希ガスを封有するガラス管１
と、このガラス管１の両端部にそれぞれ封装された一対
の冷陰極２とで構成されている。ここで、図６ (a)，
(b)の構成の場合、冷陰極２はたとえばNi棒2a、このNi
棒2aを挟んで一体的に配置された水銀合金粉末層2b、こ
の水銀合金粉末層2bを挟着する形でNi棒2aに平行溶接さ
れたFe−Ni板2c、およびFe−Ni板2cの外側面に圧着・一
体化されたゲッター粉末層2dであり、前記ガラス管１の
端部に封止・導出された導入線３に、Ni棒2aを接続・保
持させて放電電極として機能する構成と成っている。一
方、図７ (a)， (b)の構成の場合は、冷陰極２′はたと
えばNi製凹型支持体2a′、このNi製凹型支持体2a′内に
嵌合・配置された電子放射性物質を含有・充填する筒状
の焼結体2b′、および前記嵌合・配置された筒状の焼結
体2b′の後方に形成されるNi製凹型支持体2a′内の空間
部2c′に装着された水銀合金2d′で構成されている。そ
して、前記ガラス管１′の端部に封止・導出された導入
線３′に、凹型支持体2a′を接続・保持させて放電電極
として機能する構成と成っている。2. Description of the Related Art For example, a cold cathode fluorescent lamp (cold cathode low pressure discharge lamp) is generally used as a light source for a liquid crystal backlight.
A cold-cathode fluorescent lamp has been proposed in which (b) and FIGS. 7 (a) and 7 (b) each show a different main structure in cross section. That is, a glass tube 1 provided with a phosphor layer which emits light upon stimulation with ultraviolet rays on the inner wall surface and which seals a rare gas
And a pair of cold cathodes 2 sealed at both ends of the glass tube 1. Here, FIG. 6 (a),
In the case of the configuration of (b), the cold cathode 2 is, for example, a Ni rod 2a
Mercury alloy powder layer 2b integrally arranged with the rod 2a sandwiched therebetween, Fe-Ni plate 2c parallel welded to Ni rod 2a in a manner of sandwiching this mercury alloy powder layer 2b, and Fe-Ni plate 2c. A structure that functions as a discharge electrode by connecting and holding a Ni rod 2a to a lead-in wire 3 that is a getter powder layer 2d that is pressure-bonded and integrated on the outer surface and that is sealed and led out at the end of the glass tube 1. Is made. On the other hand, in the case of the configuration shown in FIGS. 7A and 7B, the cold cathode 2'is, for example, a Ni concave support 2a ', and an electron emissive material fitted and arranged in the Ni concave support 2a'. A cylindrical sintered body 2b 'containing and filling, and a space 2c' in the Ni concave support 2a 'formed behind the fitted and arranged cylindrical sintered body 2b'. It consists of a mounted mercury alloy 2d '. Further, the concave support 2a 'is connected and held to the lead-in wire 3'which is sealed and led out at the end of the glass tube 1', and functions as a discharge electrode.
【０００３】なお、この種の冷陰極蛍光ランプは、一般
的に次のような手順で製造されている。先ず、ガラス管
１，１′の洗浄から始まり、洗浄されたガラス管１，
１′内壁面に蛍光体を塗布し、次いで、蛍光体を塗布し
たガラス管１，１′を炉（ 550℃）の中に数分入れ、塗
布した螢光体の焼き付け・ガス抜きをする。その後、排
気側ビーズマウントが固定されるように、ガラス管１，
１′に窪みを付け（これをフォーミングという）、封止
工程に行く前に、予め製作しておいた封止側マウント
（電極になる材料）を、そのジュメット線部でガラス管
１，１′に封着する。引き続く排気工程で、ガラス管
１，１′内を10-2〜10-5Torr程度まで排気し、十分に排
気した後に希ガスを封入してから、排気マウントビーズ
部とガラス管１，１′とを封着する。その後、冷電極
２，２′に取り付けられた水銀ディスペンサーを高周波
で加熱し、管内に水銀を放出する。最後に、エージング
を数時間行い、ランプとして完成する。A cold cathode fluorescent lamp of this kind is generally manufactured by the following procedure. First, the cleaning of the glass tubes 1, 1'starts and the cleaned glass tubes 1, 1 '
The phosphor is coated on the inner wall surface of 1 ', and then the glass tubes 1, 1'coated with the phosphor are placed in a furnace (550 ° C) for several minutes to burn and degas the coated phosphor. After that, the glass tube 1, so that the exhaust side bead mount is fixed
A recess is formed in 1 '(this is called forming), and before going to the sealing step, a pre-manufactured sealing side mount (a material to be an electrode) is attached to the glass tube 1, 1'at its dumet wire portion. Seal on. In the subsequent evacuation process, the inside of the glass tubes 1 and 1'is evacuated to about 10 -2 to 10 -5 Torr, and after exhausting sufficiently, a rare gas is filled, and then the exhaust mount bead part and the glass tubes 1 and 1 '. Seal and. After that, the mercury dispenser attached to the cold electrodes 2 and 2'is heated at a high frequency to release mercury into the tube. Finally, aging is performed for several hours to complete the lamp.
【０００４】ところで、前記液晶バックライト用光源と
しての冷陰極蛍光ランプに関しては、市場の動向とし
て、バックライトユニットの薄型，軽量，高輝度，長寿
命化，さらに発光効率の改善が重要視され、このような
動向に伴い、組み込む光源（ランプ）についても、より
一層の細管化，長寿命化，高輝度化，高効率化が望まれ
る。With respect to the cold cathode fluorescent lamp as the light source for the liquid crystal backlight, as a market trend, it is emphasized that the backlight unit is thin, lightweight, high in brightness, long in life, and further improved in luminous efficiency. Along with such a trend, it is desired that the light source (lamp) to be incorporated is further thinned, has a longer life, has higher brightness, and has higher efficiency.
【０００５】[0005]
【発明が解決しようとする課題】冷陰極蛍光ランプの寿
命を規制する要因の一つに、ランプ点灯過程で、電極構
成物質がイオンによりスパッタされ、このスパッタ層と
水銀が化合するなどの作用により、放電に寄与すべき水
銀が徐々に減少し、ついには放電が停止するに至ること
が挙げられる。そして、バックライトユニットなど、製
品性能の要求が高まるに伴って、用いる光源（蛍光ラン
プ）もより一層の細管化が望まれるようになるが、ガラ
ス管１，１′の外径を小さくすると、必然的にガラス管
１，１′の内径が小さくなるので、放電電極（冷陰極）
も、よりも細くしないとスペース的に封装し得ないとい
う問題が生じてくる。つまり、図６ (a)， (b)に図示す
る構造の場合、ガラス管１の径を細くして冷陰極をスペ
ース的に小さく収めようとすると、封入される水銀量も
低減するので、その低減量に相当する時間だけ寿命も短
くなるという問題がある。さらに、光出力の効率（発光
効率）の点にも問題があり、この問題については、冷陰
極の電子放射機能を高め、陰極の降下電圧を低下させ、
結果的にランプ電力を小さくすることも試みられてい
る。One of the factors that limit the life of a cold cathode fluorescent lamp is that the electrode constituent substances are sputtered by ions during the lamp lighting process, and the sputtered layer and mercury combine to form a function. The reason is that the amount of mercury that should contribute to the discharge gradually decreases, and finally the discharge is stopped. Then, as demands for product performance such as a backlight unit are increased, it is desired that a light source (fluorescent lamp) to be used is further thinned, but if the outer diameter of the glass tubes 1 and 1'is reduced, Inevitably the inner diameters of the glass tubes 1, 1'become smaller, so discharge electrodes (cold cathodes)
However, there is a problem that it cannot be sealed in space unless it is made thinner. That is, in the case of the structure shown in FIGS. 6A and 6B, if the diameter of the glass tube 1 is made small and the cold cathode is to be made small in space, the amount of mercury enclosed is also reduced. There is a problem that the life is shortened by the time corresponding to the reduction amount. Furthermore, there is a problem in the efficiency of light output (emission efficiency). For this problem, the electron emission function of the cold cathode is enhanced and the voltage drop of the cathode is reduced.
As a result, attempts have been made to reduce the lamp power.
【０００６】一方、図７ (a)， (b)に図示する構造の場
合は、冷陰極が電子放射性物質を含有・保持しているの
で、この点有効であるが、たとえば冷陰極蛍光ランプを
構成するガラス管１′の内径を 3mm以下の細管としたと
き、ガラス管１′内に収納・封入し得る冷陰極も必然的
に小さくなるので、水銀合金2d′を封入し得る空所（空
間部）2c′も低減することになり、結果的に水銀の封入
量も低減し、長寿命化と発光効率の改善とは両立し得な
い。つまり、ランプ寿命現象は点灯過程での水銀消耗に
左右され、ランプの寿命と封入水銀量とは、ほぼ比例関
係にあるので、所望の寿命時間に対応した水銀量の封入
が不可欠だからである。On the other hand, in the case of the structure shown in FIGS. 7 (a) and 7 (b), the cold cathode contains and holds an electron emissive substance, which is effective in this respect. For example, a cold cathode fluorescent lamp is used. When the inner diameter of the glass tube 1'constituting is a thin tube of 3 mm or less, the cold cathode that can be housed and enclosed in the glass tube 1'is inevitably small, so that the space (space) where the mercury alloy 2d 'can be enclosed. Part) 2c ′ is also reduced, and as a result, the amount of mercury enclosed is also reduced, and it is not possible to achieve both long life and improved luminous efficiency. In other words, the lamp life phenomenon depends on the consumption of mercury during the lighting process, and since the lamp life and the enclosed mercury amount are in a substantially proportional relationship, it is indispensable to enclose the mercury amount corresponding to the desired lifetime.
【０００７】本発明は上記事情に対処してなされたもの
で、バックライトユニットの薄型，軽量，高輝度，長寿
命化，高効率化などが可能な、細管形の冷陰極低圧放電
灯の提供を目的とする。The present invention has been made in consideration of the above circumstances, and provides a thin-tube cold cathode low-pressure discharge lamp capable of making a backlight unit thin, lightweight, having high brightness, long life, and high efficiency. With the goal.
【０００８】[0008]
【課題を解決するための手段】本発明に係る冷陰極型低
圧放電灯は、内壁面に蛍光体層が設けられ、かつ希ガス
を封有するガラス管、および前記ガラス管の両端部にそ
れぞれ封装された一対の冷陰極を具備して成る冷陰極低
圧放電灯において、前記冷陰極は対向面が開口する有底
円筒状カップと、この有底円筒状カップ内に嵌合・配置
されたベース金属粉末および電子放射性物質を素材とし
て成る筒状焼結体と、この筒状焼結体の筒状空洞部内に
嵌合・配置された水銀合金を含有・充填したスリーブと
を具備して成り、かつ前記筒状焼結体およびスリーブの
先端面が有底円筒状カップ開口端部より内側に位置され
た構成を成していることを特徴とする。A cold cathode low-pressure discharge lamp according to the present invention is a glass tube provided with a phosphor layer on its inner wall surface and containing a rare gas, and both ends of the glass tube are sealed. In a cold cathode low-pressure discharge lamp comprising a pair of cold cathodes, the cold cathode has a bottomed cylindrical cup having an opening on the opposite surface, and a base metal fitted and arranged in the bottomed cylindrical cup. A cylindrical sintered body made of powder and an electron emissive material, and a sleeve containing and filled with a mercury alloy, which is fitted and arranged in the cylindrical cavity of the cylindrical sintered body, and The front end surfaces of the cylindrical sintered body and the sleeve are located inside the open end of the bottomed cylindrical cup.
【０００９】すなわち、本発明に係る冷陰極低圧放電灯
は、両端部に封入された一対の冷陰極を、互いに対向す
る面が開口した有底円筒状カップ、電子放射性物質を含
有した筒状焼結体、および水銀合金を含有・充填したス
リーブを具備し、前記有底円筒状カップ内部に、筒状焼
結体およびスリーブを端面を引っ込ませて嵌合・配置し
た構成とし、さらに要すればスリーブの有底円筒状カッ
プ内部からの離脱、もしくは有底円筒状カップ内部での
スリーブの移動を回避・解消するために、有底円筒状カ
ップの開口部を部分的に内側に、かしめもしくは舌片を
設けて縮径したことを骨子とする。That is, the cold cathode low-pressure discharge lamp according to the present invention comprises a pair of cold cathodes sealed at both ends, a bottomed cylindrical cup having openings facing each other, and a cylindrical burning containing an electron emitting substance. A structure including a bonded body and a sleeve containing and filling a mercury alloy, wherein the cylindrical sintered body and the sleeve are fitted and arranged with the end faces retracted inside the cylindrical cup with a bottom. In order to avoid / eliminate the sleeve from the inside of the bottomed cylindrical cup, or the movement of the sleeve inside the bottomed cylindrical cup, the opening of the bottomed cylindrical cup is partially inwardly swaged or tongue-shaped. The outline is that a piece is provided and the diameter is reduced.
【００１０】[0010]
【作用】封入された一対の冷陰極を、上記のごとく構成
することにより、冷陰極低圧放電灯の長寿命化および高
効率化など容易に図り得るとともに、ランプの細径化
（細管化）も達成し得る。すなわち、電子放射性物質を
含有する筒状焼結体は、有底円筒状カップ内に嵌合・配
置され、かつ有底円筒状カップで側面が完全に覆われ先
端部のみが一部露出されているに過ぎない。したがっ
て、ランプ点灯過程において、ランプ内壁表面への電極
構成物質のイオンスパッタする現象も遮蔽ないし低減さ
れ、ランプの長寿命化が図られる。一方、冷陰極自体、
水銀合金の充填量も確保し易く、また前記水銀合金を充
填したスリーブを嵌合・配置する筒状焼結体および有底
円筒状カップの細径化も比較的容易であるので、ランプ
（ガラス管）の細径化にも容易に対応し得る。By configuring the pair of enclosed cold cathodes as described above, it is possible to easily achieve a long life and high efficiency of the cold cathode low pressure discharge lamp, and also to reduce the diameter of the lamp (narrow tube). Can be achieved. That is, the cylindrical sintered body containing the electron emitting substance is fitted and arranged in the bottomed cylindrical cup, and the side surface is completely covered by the bottomed cylindrical cup, and only the tip is partially exposed. I'm just there. Therefore, in the process of lighting the lamp, the phenomenon of ion sputtering of the electrode constituent material on the inner wall surface of the lamp is shielded or reduced, and the life of the lamp is extended. On the other hand, the cold cathode itself,
Since it is easy to secure the filling amount of the mercury alloy, and it is relatively easy to reduce the diameter of the cylindrical sintered body and the bottomed cylindrical cup into which the sleeve filled with the mercury alloy is fitted and arranged, the lamp (glass It is possible to easily cope with the reduction of the diameter of the pipe.
【００１１】さらに、前記筒状焼結体が電子放射性物質
を含有しているため、前記電子放射性物質の作用によっ
て、安定点灯時に陰極降下電圧が低下し、これに伴い管
電圧も低下するので、結果的にランプ効率が改善され
る。Further, since the cylindrical sintered body contains the electron emitting substance, the cathode drop voltage is lowered during stable lighting due to the action of the electron emitting substance, and the tube voltage is also reduced accordingly. As a result, lamp efficiency is improved.
【００１２】[0012]
【実施例】次に図１〜図５を参照して本発明の実施例を
説明する。Embodiments of the present invention will be described below with reference to FIGS.
【００１３】図１は本発明に係る冷陰極低圧放電灯の要
部構成例を断面的に示したもので、４は内壁面に紫外線
による刺激で発光する蛍光体層（図示せず）が設けら
れ、かつ希ガスを封有する外径 3.8mm，内径 2.8mmのガ
ラス管、５は前記ガラス管４の両端部にそれぞれ封入さ
れた一対の冷陰極である。ここで、前記冷陰極５は、た
とえばNi製の有底円筒状カップ5a、前記有底円筒状カッ
プ5a内に嵌合・配置された電子放射性物質を含有する筒
状焼結体5b、およびこの筒状焼結体5bの筒状空洞部内に
嵌合・配置された水銀合金5cを充填したNi製のスリーブ
5dで構成されており、また前記水銀合金5cを充填したNi
製のスリーブ5dは、外径 1mm，長さ 3mmで、充填水銀量
約 2mgである。なお、前記電子放射性物質を含有する筒
状焼結体5bは、たとえば平均粒径 3μm のタングステン
金属粉末および平均粒径 4μm の炭酸バリウム粉末の混
合物（混合比はタングステン：炭酸バリウム＝ 100：4
5）を、外径 2.2mm，内径 1.1mm，長さ 3mmの円筒形に
焼結・形成したものである。FIG. 1 is a cross-sectional view showing an example of the essential structure of a cold cathode low-pressure discharge lamp according to the present invention. Reference numeral 4 is a phosphor layer (not shown) provided on the inner wall surface for emitting light upon stimulation with ultraviolet rays. A glass tube 5 having an outer diameter of 3.8 mm and an inner diameter of 2.8 mm, which contains a rare gas, is a pair of cold cathodes sealed at both ends of the glass tube 4. Here, the cold cathode 5 is, for example, a bottomed cylindrical cup 5a made of Ni, a cylindrical sintered body 5b fitted and arranged in the bottomed cylindrical cup 5a and containing an electron emitting substance, and this. Ni sleeve filled with mercury alloy 5c fitted and arranged in the cylindrical cavity of cylindrical sintered body 5b
Ni which is composed of 5d and is filled with the mercury alloy 5c.
The manufactured sleeve 5d has an outer diameter of 1 mm, a length of 3 mm, and a mercury filling amount of about 2 mg. The cylindrical sintered body 5b containing the electron emitting substance is, for example, a mixture of tungsten metal powder having an average particle size of 3 μm and barium carbonate powder having an average particle size of 4 μm (mixing ratio is tungsten: barium carbonate = 100: 4).
5) was sintered and formed into a cylindrical shape with an outer diameter of 2.2 mm, an inner diameter of 1.1 mm, and a length of 3 mm.
【００１４】また、この構成例では、有底円筒状カップ
5a内に嵌合・配置された筒状焼結体5b、および筒状焼結
体5bの空洞部内に嵌合・配置された水銀合金5cを充填し
たNi製スリーブ5dの各端面を、有底円筒状カップ5aの開
口端面より内側に位置させるとともに、有底円筒状カッ
プ5aの開口端を一部折り曲げ（縮径させた形）、この折
り曲げ部5eにて、筒状焼結体5bおよびNi製スリーブ5dを
各端面部で固定した構造としている。さらに、前記冷陰
極５はガラス管４の両端部にそれぞれ封止・導出された
導入線６に、有底円筒状カップ5aの底部を接続・保持さ
せて放電電極として機能する構成を成している。Further, in this configuration example, a bottomed cylindrical cup
Each end surface of the cylindrical sintered body 5b fitted and arranged in 5a and the Ni sleeve 5d filled with the mercury alloy 5c fitted and arranged in the hollow portion of the cylindrical sintered body 5b is closed. The cylindrical cup 5a is located inside the open end surface, and the open end of the bottomed cylindrical cup 5a is partially bent (diameter reduced), and at this bent portion 5e, the cylindrical sintered body 5b and Ni are The structure is such that the sleeve 5d is fixed at each end face. Further, the cold cathode 5 is configured to function as a discharge electrode by connecting and holding the bottom portion of the bottomed cylindrical cup 5a to the lead-in wires 6 sealed and led out at both ends of the glass tube 4. There is.
【００１５】上記構成の管長 160mmの冷陰極低圧放電灯
に対して、冷陰極の構造が異なる他はサイズを同一とし
た前記図６に図示した構成の冷陰極低圧放電灯（比較例
１）、および前記図７に図示した構成の冷陰極低圧放電
灯（比較例２）について、常温状態下、ランプ電流 5mA
でそれぞれ点灯試験を行った。これら試験に供した各冷
陰極低圧放電灯の構造・寸法の概略は、表１に示すごと
くであった。In contrast to the cold cathode low pressure discharge lamp having a tube length of 160 mm having the above structure, the cold cathode low pressure discharge lamp (Comparative Example 1) having the structure shown in FIG. 6 is the same except that the structure of the cold cathode is different. As for the cold cathode low-pressure discharge lamp (Comparative Example 2) having the structure shown in FIG. 7, the lamp current was 5 mA at room temperature.
The lighting test was conducted respectively. The structures and dimensions of the cold cathode low-pressure discharge lamps used in these tests are summarized in Table 1.
【００１６】 表１ 試料 管長 管外径 管内径 封入水銀量 実施例 160mm 3.8mm 2.8mm 4.0mg 比較例１ 160mm 3.8mm 2.8mm 2.6mg 比較例２ 160mm 3.8mm 2.8mm 0.5mg なお、上記点灯試験は、図２に示す常套的な測定回路に
よって行い、その試験結果は、図３〜図５に示すごとく
であった。図３は管電流と管電圧との関係を、図４は点
灯時間と電極近傍における管（バルブ）壁の黒化寸法と
の関係を、さらに図５は点灯時間と輝度維持率および不
点灯に至る時間との関係をそれぞれ示す。そして、これ
ら図３〜図５において、曲線Ａは実施例１の場合を、曲
線ａは比較例１の場合を、また曲線ｂは比較例２の場合
を示している。なお、ここで黒化寸法とは、一方の冷電
極先端から、対向する他方の冷電極方向へ黒化している
長さである。表２は上記点灯試験結果を示したものであ
る。Table 1 Sample tube length Tube outer diameter Tube inner diameter Enclosed mercury amount Example 160mm 3.8mm 2.8mm 4.0mg Comparative example 1 160mm 3.8mm 2.8mm 2.6mg Comparative example 2 160mm 3.8mm 2.8mm 0.5mg The above lighting test The conventional measurement circuit shown in FIG. 2 was used, and the test results were as shown in FIGS. FIG. 3 shows the relationship between the tube current and the tube voltage, FIG. 4 shows the relationship between the lighting time and the blackening dimension of the tube (bulb) wall near the electrodes, and FIG. The relationship with the time to reach is shown. 3 to 5, the curve A shows the case of Example 1, the curve a shows the case of Comparative Example 1, and the curve b shows the case of Comparative Example 2. Here, the blackened dimension is the length of blackening from the tip of one cold electrode toward the opposite cold electrode. Table 2 shows the lighting test results.
【００１７】 表２ 試料 寿命（Hr） 黒化寸法(7500Hr 後，mm） 総合判定 実施例 15000 3.0 ◎ 比較例１ 10200 4.2 △ 比較例２ 7500 3.5 × 上記試験結果から分かるように、実施例の場合は、比較
例１の場合に比べて管電圧が80〜90 V低く、7500時間点
灯した時点で黒化寸法が 1.2mmも小さく、寿命が 1.5倍
以上になっている。また、比較例２の場合に比べても、
管電圧がほぼ同じであるが、7500時間点灯した時点で黒
化寸法が 0.5mm短く、寿命が 2倍以上になっている。Table 2 Sample life (Hr) Blackening dimension (after 7500 hours, mm) Overall judgment Example 15000 3.0 ◎ Comparative example 1 10200 4.2 △ Comparative example 2 7500 3.5 × As can be seen from the above test results, in the case of the example The tube voltage is 80 to 90 V lower than that of Comparative Example 1, the blackened dimension is 1.2 mm smaller at the time of lighting for 7500 hours, and the life is 1.5 times or more. Also, compared to the case of Comparative Example 2,
Although the tube voltage is almost the same, the blackened dimension is 0.5 mm shorter and the life is more than doubled after 7500 hours of lighting.
【００１８】なお、上記実施例において、冷電極の電子
放射性物質含有の筒状焼結体として、平均粒径10μm の
タングステン粉末を素材とした多孔質焼結体に、懸濁さ
せた炭酸バノウム微粉末を含浸・担持、加熱乾燥させた
構成のものを用いた外は、同一構成の冷電極低圧放電灯
を作成し、点灯試験を行ったところ、前記実施例の場合
と動揺の結果が認められた。In the above-mentioned embodiment, as the cylindrical sintered body containing the electron emitting substance for the cold electrode, the suspended vanadium carbonate fine particles were suspended in the porous sintered body made of tungsten powder having an average particle diameter of 10 μm. A cold electrode low-pressure discharge lamp having the same structure was prepared and a lighting test was conducted, except that a powder impregnated / supported, and heat-dried structure was used. It was
【００１９】[0019]
【発明の効果】上記説明から分かるように、本発明に係
る冷陰極低圧放電灯によれば、円筒状カップ内部に、電
子放射性物質を含有する筒状の焼結体を嵌合・配置した
構成を採るとともに、水銀合金を充填したスリーブを円
筒状焼結体の空洞部に嵌合・配置し、前記円筒状カップ
で筒状焼結体の周面を覆い、なおかつ、前記筒状焼結体
およびスリーブの先端面を、前記円筒状カップの開口端
部より内側に位置させた電極構造としたことにより、ラ
ンプ電圧の低下が図られて、その結果ランプ効率が改善
される他、発光管内壁面へのスパッタが効果的に遮蔽さ
れる。つまり、点灯動作に伴って生じる黒化寸法を短く
抑えることが可能となり、ランプ発光長から見ると有効
発光部が長くなることになる。また、この構成において
は、発光管（ガラス管）を比較的細径に選択することも
可能であるので、前記長寿命性および有効発光部の長尺
化などと相俟って、液晶バックライト用光源などのコン
パクト化に大きく寄与するものといえる。As can be seen from the above description, according to the cold cathode low-pressure discharge lamp of the present invention, a cylindrical sintered body containing an electron emissive substance is fitted and arranged inside a cylindrical cup. In addition, the sleeve filled with the mercury alloy is fitted and arranged in the hollow portion of the cylindrical sintered body, and the cylindrical cup covers the peripheral surface of the cylindrical sintered body. The electrode structure in which the front end surface of the sleeve and the sleeve are positioned inside the opening end of the cylindrical cup reduces the lamp voltage, resulting in improved lamp efficiency and the inner wall surface of the arc tube. Is effectively shielded against spatter. That is, it is possible to reduce the blackening dimension caused by the lighting operation to be short, and the effective light emitting portion becomes long when viewed from the light emission length of the lamp. Further, in this configuration, since the arc tube (glass tube) can be selected to have a relatively small diameter, the liquid crystal backlight is combined with the above-mentioned long life and lengthening of the effective light emitting portion. It can be said that this greatly contributes to the compactness of the light source for use.
【図１】本発明に係る冷陰極低圧放電灯の要部構成例を
示すもので、 (a)は縦断面図、(b)は横断面図。1A and 1B show an example of a main configuration of a cold cathode low-pressure discharge lamp according to the present invention, in which FIG. 1A is a vertical sectional view and FIG. 1B is a horizontal sectional view.
【図２】本発明に係る冷陰極低圧放電灯の点灯試験に用
いた測定回路図。FIG. 2 is a measurement circuit diagram used for a lighting test of a cold cathode low pressure discharge lamp according to the present invention.
【図３】本発明に係る冷陰極低圧放電灯および従来の冷
陰極低圧放電灯について、管電流と管電圧の関係を比較
して示す曲線図。FIG. 3 is a curve diagram showing a comparison between a tube current and a tube voltage in a cold cathode low-pressure discharge lamp according to the present invention and a conventional cold cathode low-pressure discharge lamp.
【図４】本発明に係る冷陰極低圧放電灯および従来の冷
陰極低圧放電灯について、点灯時間と黒化寸法の関係を
比較して示す曲線図。FIG. 4 is a curve diagram showing a comparison between a lighting time and a blackening dimension of a cold cathode low-pressure discharge lamp according to the present invention and a conventional cold cathode low-pressure discharge lamp.
【図５】本発明に係る冷陰極低圧放電灯および従来の冷
陰極低圧放電灯について、点灯時間と輝度維持率の関係
を比較して示す曲線図。FIG. 5 is a curve diagram showing a comparison between a lighting time and a luminance maintenance rate of a cold cathode low pressure discharge lamp according to the present invention and a conventional cold cathode low pressure discharge lamp.
【図６】従来の冷陰極低圧放電灯の要部構成を示すもの
で、 (a)は縦断面図、 (b)は横断面図。[Fig. 6] Fig. 6 shows a configuration of a main part of a conventional cold cathode low-pressure discharge lamp, in which (a) is a longitudinal sectional view and (b) is a lateral sectional view.
【図７】従来の冷陰極低圧放電灯の他の要部構成を示す
もので、 (a)は縦断面図、 (b)は横断面図。FIG. 7 is a view showing another configuration of a conventional cold cathode low-pressure discharge lamp, in which (a) is a longitudinal sectional view and (b) is a lateral sectional view.
１，１′，４…ガラス管 ２，２′，５…冷陰極
2a…Ni棒 2a′…凹型支持体 2b，2d′，5c…水銀
合金 2c…Fe−Ni板 2c′…空間部 2d…ゲッタ
ー粉末 ３，３′，６…導入線 5a…有底円筒状カ
ップ 5d…電子放射性物質含有の焼結体 5b…筒状
焼結体 5b′…筒状の焼結体 5d…Niスリーブ
5e…折り曲げ部1, 1 ', 4 ... Glass tube 2, 2', 5 ... Cold cathode
2a ... Ni rod 2a '... concave support 2b, 2d', 5c ... mercury alloy 2c ... Fe-Ni plate 2c '... space 2d ... getter powder 3,3', 6 ... introduction line 5a ... bottomed cylindrical cup 5d ... Electron-emissive material-containing sintered body 5b ... Cylindrical sintered body 5b '... Cylindrical sintered body 5d ... Ni sleeve
5e ... Bent section
Claims (1)
スを封有するガラス管、および前記ガラス管の両端部に
それぞれ封装された一対の冷陰極を具備して成る冷陰極
低圧放電灯において、 前記冷陰極は対向面が開口する有底円筒状カップと、こ
の有底円筒状カップ内に嵌合・配置されたベース金属粉
末および電子放射性物質を素材として成る筒状焼結体
と、この筒状焼結体の筒状空洞部内に嵌合・配置された
水銀合金を含有・充填したスリーブとを具備して成り、
かつ前記筒状焼結体およびスリーブの先端面が有底円筒
状カップ開口端部より内側に位置された構成を成してい
ることを特徴とする冷陰極低圧放電灯。1. A cold cathode low-pressure discharge lamp comprising a glass tube having a phosphor layer provided on an inner wall surface thereof and sealing a rare gas, and a pair of cold cathodes respectively sealed at both ends of the glass tube. In the above, the cold cathode has a bottomed cylindrical cup whose opposite surface is open, and a cylindrical sintered body made of a base metal powder and an electron emissive material fitted and arranged in the bottomed cylindrical cup, And a sleeve containing and filled with a mercury alloy, which is fitted and arranged in the cylindrical hollow portion of the cylindrical sintered body,
Further, the cold cathode low-pressure discharge lamp is characterized in that the end surfaces of the cylindrical sintered body and the sleeve are located inside the opening end of the bottomed cylindrical cup.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25552493A JPH07111145A (en) | 1993-10-13 | 1993-10-13 | Cold cathode low pressure discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25552493A JPH07111145A (en) | 1993-10-13 | 1993-10-13 | Cold cathode low pressure discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07111145A true JPH07111145A (en) | 1995-04-25 |
Family
ID=17279942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25552493A Withdrawn JPH07111145A (en) | 1993-10-13 | 1993-10-13 | Cold cathode low pressure discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07111145A (en) |
-
1993
- 1993-10-13 JP JP25552493A patent/JPH07111145A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20001226 |