JPH08241695A - Cold cathode low pressure discharge lamp - Google Patents
Cold cathode low pressure discharge lampInfo
- Publication number
- JPH08241695A JPH08241695A JP4271095A JP4271095A JPH08241695A JP H08241695 A JPH08241695 A JP H08241695A JP 4271095 A JP4271095 A JP 4271095A JP 4271095 A JP4271095 A JP 4271095A JP H08241695 A JPH08241695 A JP H08241695A
- Authority
- JP
- Japan
- Prior art keywords
- cold cathode
- pressure discharge
- discharge lamp
- glass tube
- metal
- 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- Withdrawn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 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 13
- 229910000645 Hg alloy Inorganic materials 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000005247 gettering Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 6
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical group [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 229910052754 neon Inorganic materials 0.000 description 4
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 4
- 230000000638 stimulation Effects 0.000 description 4
- 229910052724 xenon Inorganic materials 0.000 description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 229910052743 krypton Inorganic materials 0.000 description 2
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method 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小形軽量化，長寿命
化，高効率化などが可能な、始動電圧が低く、かつ長寿
命な冷陰極低圧放電灯の提供を目的とする。
【構成】 第１の冷陰極低圧放電灯は、放電性媒体ガス
を封入するガラス管２、および前記ガラス管２の両端部
にそれぞれ封装された一対の放電可能な冷陰極３′，
４′を具備して成る冷陰極低圧放電灯において、前記冷
陰極３′，４′は、互いに対向する面が開口し、かつ第
１の金属製筒状体から成る円筒状カップ3a′，4a′と、
この円筒状カップ3a′，4a′の封止端側に段付型に嵌合
装着された第２の金属製筒状体3b′，4b′と、前記円筒
状カップ3a′，4a′内に同心円的に装着され、他端側が
導入線５，６に接続する金属製円柱体3c′，4c′とを具
備した構成と成ってることを特徴とする。
(57) [Summary] [Purpose] It is an object of the present invention to provide a cold cathode low-pressure discharge lamp with a low starting voltage and a long life, which enables reduction in size and weight of a backlight unit, long life, and high efficiency. A first cold cathode low-pressure discharge lamp includes a glass tube 2 for enclosing a discharge medium gas, and a pair of dischargeable cold cathodes 3 ', which are sealed at both ends of the glass tube 2, respectively.
In the cold cathode low-pressure discharge lamp including 4 ', the cold cathodes 3'and 4'are cylindrical cups 3a' and 4a each having a surface opposite to each other and formed of a first metal tubular body. 'When,
In the cylindrical cups 3a ', 4a' and the second metallic cylindrical bodies 3b ', 4b' fitted and mounted in a stepped manner on the sealing end sides of the cylindrical cups 3a ', 4a'. It is characterized in that it is concentrically mounted and that the other end side is provided with metal columnar bodies 3c ', 4c' connected to the introduction lines 5, 6.
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、さらに詳しくは始動電圧を低下させたことによっ
て、始動用トランスの小型軽量化などを図った冷陰極低
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 cold cathode low pressure discharge lamp in which a starting transformer is made smaller and lighter by reducing a starting voltage.
【０００２】[0002]
【従来の技術】冷陰極蛍光ランプ，ネオン放電管やキセ
ノン放電管などの冷陰極低圧放電灯は、各種の照明光源
などとして広く実用に供されている。たとえば、図２
(a)に全体構成を断面的に、図２ (b)および (c)に一部
を拡大して断面的に示すような冷陰極蛍光ランプ（冷陰
極低圧放電灯）が、液晶ディスプレイやワープロなどの
バックライト用光源として一般的に使用されている。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
１が設けられ、かつ希ガス（放電性媒体ガス）を封入す
るガラス管２と、このガラス管２の両端部にそれぞれ封
装された一対の冷陰極（放電電極）３，４とで構成され
ている。なお、図２ (a)， (b)， (c)に図示する構成に
おいては、冷陰極３，４はたとえばNi製スリーブ3a，4
a、このNi製スリーブ3a，4a内に充填された水銀合金粉
末およびゲッタ剤の混合物3b，4bで構成されている。ま
た、ガラス管２の端部に封止・導出された導入線５，
５′に、前記Ni製スリーブ3a，4a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 Cold cathode low-pressure discharge lamps such as cold cathode fluorescent lamps, neon discharge tubes, and xenon discharge tubes have been widely put to practical use as various illumination light sources. For example, in Figure 2.
A cold-cathode fluorescent lamp (cold-cathode low-pressure discharge lamp) as shown in FIG. 2 (b) and FIG. It is generally used as a light source for backlights such as. That is, a phosphor layer 1 that emits light upon stimulation with ultraviolet rays is provided on the inner wall surface, and a glass tube 2 that encloses a rare gas (discharging medium gas), and a pair of glass tubes 2 sealed at both ends of the glass tube 2, respectively. It is composed of cold cathodes (discharge electrodes) 3 and 4. 2 (a), (b), (c), the cold cathodes 3, 4 are made of, for example, Ni sleeves 3a, 4
a, a mixture 3b, 4b of mercury alloy powder and getter agent filled in the Ni sleeves 3a, 4a. Further, the lead-in wire 5, which is sealed and led out at the end of the glass tube 2,
The Ni sleeves 3a and 4a are connected and held at 5'to function as a discharge electrode.
【０００３】そして、この種の冷陰極蛍光ランプは、導
入線５，５′を介して冷陰極３，４に通電すると、この
通電で発生した初期プラズマ中のイオンによって、前記
冷陰極３，４から二次電子を放出し、ガラス管２内で放
電を開始する。この放電による電子エネルギーは、水銀
原子の共鳴遷移によって紫外線を励起・放射し、この放
射された紫外線が、前記ガラス管２の内壁面に形成され
ている蛍光体層１を励起して可視光を発し、光源として
機能する。In this type of cold cathode fluorescent lamp, when the cold cathodes 3 and 4 are energized through the introduction lines 5 and 5 ', the cold cathodes 3 and 4 are generated by the ions in the initial plasma generated by this energization. The secondary electrons are emitted from the inside of the glass tube 2 to start the discharge in the glass tube 2. The electron energy generated by this discharge excites and radiates ultraviolet rays due to the resonance transition of mercury atoms, and the emitted ultraviolet rays excite the phosphor layer 1 formed on the inner wall surface of the glass tube 2 to generate visible light. It emits and functions as a light source.
【０００４】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２の洗浄から始まり、洗浄されたガラス管２の内壁に
蛍光体を塗布し、次いで、蛍光体１を塗布したガラス管
２を炉（ 550℃）の中に数分入れ、塗布した蛍光体１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２に窪みを付け、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
２に封着する。引き続いて、排気工程でガラス管２内を
10-3〜10-5Torr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
２とを封着する。その後、冷電極３，４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、水銀を管内に
放出してから、最後に、エージングを数時間行ってラン
プとして完成する。A cold cathode fluorescent lamp of this type is generally manufactured by the following procedure. First, starting from the cleaning of the glass tube 2, the phosphor is coated on the inner wall of the cleaned glass tube 2, and then the glass tube 2 coated with the phosphor 1 is put in a furnace (550 ° C.) for several minutes and coated. The phosphor 1 is baked and degassed. After that, a recess is made in the glass tube 2 so that the exhaust side bead mount is fixed, and the sealing side mount (material to be an electrode) that has been manufactured in advance is attached to the dumet wire before going to the sealing step. Part is sealed to the glass tube 2. Then, the inside of the glass tube 2 is exhausted.
After exhausting to about 10 −3 to 10 −5 Torr and exhausting sufficiently, a rare gas is sealed, and then the exhaust mount bead portion and the glass tube 2 are sealed. After that, the mercury dispenser attached to the cold electrodes 3 and 4 is heated at a high frequency to discharge mercury into the tube, and finally, aging is performed for several hours to complete a lamp.
【０００５】一方、ネオン放電管やキセノン放電管の場
合は、ガラス管内に封入された一対の冷電極間の放電
を、同じくガラス管内に封入した放電性ガス（ネオン，
キセノン，クリプトンなど）による放電助長作用などで
所要の光を放射させ、光源としての機能を得ている。On the other hand, in the case of a neon discharge tube or a xenon discharge tube, the discharge between a pair of cold electrodes enclosed in the glass tube is caused by the discharge gas (neon,
Xenon, krypton, etc.) emits the required light due to the discharge-promoting action, etc., and has obtained the function as a light source.
【０００６】[0006]
【発明が解決しようとする課題】ところで、前記液晶バ
ックライト用光源などでは市場の動向として、バックラ
イトユニットの軽量化や長寿命化、さらには高性能化が
望まれている。そして、このような動向に伴い、組み込
む光源（冷陰極低圧放電灯）についても、より一層の小
型軽量化，長寿命化，高効率化などが望まれる。By the way, as a market trend for the liquid crystal backlight light source and the like, there is a demand for a lighter weight, longer life and higher performance of the backlight unit. With such trends, it is desired that the light source (cold-cathode low-pressure discharge lamp) to be incorporated is further reduced in size and weight, has a longer life, and has higher efficiency.
【０００７】そして、前記要望、たとえば小型軽量化の
一手段として、始動用トランスの小形化などが挙げられ
る。すなわち、冷陰極低圧放電灯、たとえば冷陰極蛍光
ランプの始動電圧を低電圧化し、この低電圧化によっ
て、低い始動電圧を維持するための始動用トランスを極
力小さく設定することを可能とすることに伴って、小形
化を図ることも試みられている。さらに言及すると、冷
陰極蛍光ランプの始動電圧の低電圧化や、冷陰極蛍光ラ
ンプの長寿命化を目的として、電極構造の改良，検討な
どが進められている（たとえば特開平4-109546号公報，
特開平3-285247号公報など）。And, as one of the means for reducing the size and weight, there is a downsizing of the starting transformer. That is, the starting voltage of a cold cathode low-pressure discharge lamp, for example, a cold cathode fluorescent lamp is lowered, and by lowering the voltage, it is possible to set the starting transformer for maintaining a low starting voltage as small as possible. Along with this, attempts have been made to reduce the size. More specifically, the electrode structure is being improved and studied for the purpose of lowering the starting voltage of the cold cathode fluorescent lamp and extending the life of the cold cathode fluorescent lamp (for example, JP-A-4-109546). ，
JP-A-3-285247, etc.).
【０００８】しかし、前記いろいろの試みにおいても、
実用上十分な対応策は得られていない。すなわち、前記
試みられた電極構造の場合、使用初期の段階では、始動
電圧の低電圧化が確保・維持されているが長時間に亘っ
て使用すると、電極の消耗などが原因になって、低い始
動電圧を維持することが困難であり、また、冷陰極放電
灯の寿命が短いという問題があって、十分な対応策の開
発が望まれているのが実情である。However, even in the above-mentioned various attempts,
Practically sufficient countermeasures have not been obtained. That is, in the case of the above-mentioned attempted electrode structure, the starting voltage is kept low in the initial stage of use, but if it is used for a long period of time, it will be low due to electrode wear and the like. Since it is difficult to maintain the starting voltage and the life of the cold cathode discharge lamp is short, there is a demand for the development of sufficient countermeasures.
【０００９】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小形軽量化，長寿命化，高
効率化などが可能な、始動電圧が低く、かつ長寿命な冷
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 it is possible to reduce the size and weight of a backlight unit, extend its life, and improve its efficiency. The purpose is to provide electric lights.
【００１０】[0010]
【課題を解決するための手段】本発明に係る第１の冷陰
極低圧放電灯は、放電性媒体ガスを封入するガラス管、
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
の放電可能な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、第１の金属から成る円筒状カッ
プの封止端側対し、前記第１の金属より低い仕事係数を
有する第２の金属から成る筒状体を同心円的に装着させ
た構成を採っていることを特徴とする。A first cold cathode low pressure discharge lamp according to the present invention is a glass tube for enclosing a discharge medium gas,
And a cold cathode low-pressure discharge lamp comprising a pair of cold cathodes capable of discharging, which are respectively sealed at both ends of the glass tube, wherein the cold cathode is a sealed end side of a cylindrical cup made of a first metal. On the other hand, it is characterized in that a cylindrical body made of a second metal having a work coefficient lower than that of the first metal is concentrically mounted.
【００１１】本発明に係る第２の冷陰極低圧放電灯は、
内壁面に蛍光体層が設けられ、かつ放電性媒体ガスを封
入するガラス管、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放電可能な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、第１の金属か
ら成る円筒状カップの封止端側対し、前記第１の金属よ
り低い仕事係数を有する第２の金属から成る筒状体を同
心円的に装着させ、さらに前記円筒状カップ内に水銀合
金およびゲッタ剤を充填したた構成を採っていることを
特徴とする。A second cold cathode low pressure discharge lamp according to the present invention is
A cold cathode low-pressure discharge lamp comprising a glass tube having an inner wall surface provided with a phosphor layer and encapsulating a discharge medium gas, and a pair of dischargeable cold cathodes sealed at both ends of the glass tube. In the cold cathode, a cylindrical body made of a second metal having a work coefficient lower than that of the first metal is concentrically attached to a closed end side of a cylindrical cup made of the first metal, Furthermore, it is characterized in that the cylindrical cup is filled with a mercury alloy and a gettering agent.
【００１２】本発明に係る冷陰極低圧放電灯は、封装さ
れた放電可能な冷陰極の構成、もしくは構造の点で特徴
付けられる。つまり、冷陰極の構造部を少なくとも２種
の金属で形成し、それら各金属の仕事関数差によって、
異種の金属間にフェルミ準位が一致するように電子が移
動する性質を利用することを骨子としている。ここで、
たとえば第１の金属としてNiを、第２の金属としてAlを
それぞれ例示し得る。なお、第１の金属および第２の金
属は、前記したように仕事関数差を考慮して区分される
ので、いわゆる相対的な選択関係にあり、前者の仕事関
数は後者に比べて高くなっている。たとえば Ni-Cr合金
とAl，Ni-Al-Cr合金とAl， Ni-Cr合金とFe，Ni-Al-Cr合
金とFeなどが挙げられる。The cold cathode low-pressure discharge lamp according to the present invention is characterized by the structure or structure of the enclosed cold cathode capable of discharging. That is, the structure of the cold cathode is formed of at least two kinds of metals, and the work function difference between the respective metals causes
The essence is to utilize the property that electrons move so that Fermi levels are matched between different metals. here,
For example, Ni can be exemplified as the first metal and Al can be exemplified as the second metal. Since the first metal and the second metal are classified in consideration of the work function difference as described above, they have a so-called relative selection relationship, and the work function of the former is higher than that of the latter. There is. Examples include Ni-Cr alloys and Al, Ni-Al-Cr alloys and Al, Ni-Cr alloys and Fe, and Ni-Al-Cr alloys and Fe.
【００１３】また、本発明に係る冷陰極低圧放電灯にお
いて、ガラス管内に封入される放電性媒体としては、た
とえばネオンガス，アルゴンガス，キセノンガス，クリ
プトンガスもしくはこれらの２種以上の混合ガスが挙げ
られ、その封入量は、通常30〜 100Torr程度である。In the cold cathode low-pressure discharge lamp according to the present invention, examples of the discharge medium sealed in the glass tube include neon gas, argon gas, xenon gas, krypton gas, or a mixed gas of two or more kinds thereof. The filling amount is usually about 30 to 100 Torr.
【００１４】さらに、本発明に係る冷陰極低圧放電灯
は、前記したように、異種の金属で構成された冷陰極の
まま封装した構成を採ってもよいが、第１の金属製筒状
体から成る有底円筒状カップ内に、水銀合金もしくは水
銀合金−ゲッター剤の混合系を充填した形態を採っても
よい。Further, as described above, the cold cathode low-pressure discharge lamp according to the present invention may have a structure in which the cold cathode made of a different kind of metal is sealed as it is, but the first metal tubular body is used. It is also possible to adopt a form in which a bottomed cylindrical cup made of is filled with a mercury alloy or a mixed system of a mercury alloy and a getter agent.
【００１５】[0015]
【作用】上記のごとく、異種の金属を組み合わせ・接合
させて冷陰極を構成したことにより、冷陰極の陽光柱側
に負の電荷が帯電されるため、対向する冷陰極は通電開
始以前に放電に関与する電子が活性化された状態を採っ
ている。つまり、通電開始に先だって、冷陰極低圧放電
灯はすでに放電開始準備状態を採っているので、比較的
低い始動電圧で容易に放電が開始することになる。さら
に言及すると、始動用トランスの容量などを低減させて
始動電圧源を低く設定しても、所要の放電が容易に、か
つ確実に行われて、所定の照明用光源して機能する。そ
して、前記始動用トランスの低容量化は、始動用トラン
スの小型軽量化となり、バックライト用光源としての利
用した場合、液晶ディスプレイ部の小型軽量化に大きく
寄与することになる。As described above, since the cold cathode is formed by combining and joining different kinds of metals, negative charges are charged on the positive column side of the cold cathode, so that the opposing cold cathode is discharged before the start of energization. The electrons involved in are in the activated state. In other words, prior to the start of energization, the cold cathode low-pressure discharge lamp is already in the discharge start preparation state, so that the discharge easily starts at a relatively low starting voltage. More specifically, even if the capacity of the starting transformer is reduced and the starting voltage source is set low, the required discharge is performed easily and surely, and it functions as a predetermined illumination light source. The reduction in capacity of the starting transformer leads to a reduction in size and weight of the starting transformer, and when used as a light source for a backlight, it greatly contributes to reduction in size and weight of the liquid crystal display unit.
【００１６】[0016]
【実施例】次に図１ (a)および (b)を参照して本発明の
実施例を説明する。EXAMPLE An example of the present invention will be described with reference to FIGS. 1 (a) and 1 (b).
【００１７】実施例１ 図１ (a)は、本発明に係る定格12 W型の冷陰極低圧放電
灯の主要部体構成を拡大して横断面的に、図１ (b)は同
じく主要部体構成を拡大して縦断面的にそれぞれ示した
ものである。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１が設けられ、かつ放電性媒体、たとえ
ばアルゴンガスを封入する外径 3.0mm，内径 2.0mmのガ
ラス管２と、このガラス管２の両端部にそれぞれ封装さ
れた一対の冷陰極（放電電極）３′，４′とで構成され
ている。ここで、図１ (a)， (b)に図示する構成におい
て、冷陰極３′，４′は、互いに対向する面が開口する
第１の金属製筒状体、たとえば開口部の内径 1.6mm（肉
厚 0.2mm）程度，長さ10mm，他端縮径型のNi製円筒状カ
ップ3a′，4a′と、前記Ni製円筒状カップ3a′，4a′の
封止端側に段付型に嵌合装着された第２の金属製筒状
体、たとえば一端縮径型のAl製円筒状体3b′，4b′と、
前記Ni製円筒状カップ3a′，4a′内に同心円的に装着さ
れ、Ni製円筒状カップ3a′，4a′の他端縮径部を封止す
る外径 0.9mm，長さ10mm程度のNi製円柱体3c′，4c′と
を具備した構成と成ってる。ここで、Al製円筒状体3
b′，4b′は、Ni製円筒状カップ3a′，4a′の封止端側
に密着的に嵌合・装着しており、このためにAl製円筒状
体3b′，4b′の内径は、Ni製円筒状カップ3a′，4a′の
外径とほぼ同じに設定されており、また、前記Ni製円筒
状カップ3a′，4a′内に同心円的に装着されたNi製円柱
体3c′，4c′は、ガラス管２の端部に封止・導出された
導入線５，６に電気的に接続されている。Example 1 FIG. 1 (a) is an enlarged cross-sectional view of the main structure of a 12 W type cold cathode low-pressure discharge lamp according to the present invention, and FIG. 1 (b) is the same. The body structure is enlarged and shown in a longitudinal section. That is, a phosphor layer 1 that emits light upon stimulation with ultraviolet rays is provided on the inner wall surface, and a glass tube 2 with an outer diameter of 3.0 mm and an inner diameter of 2.0 mm that encloses a discharge medium, such as argon gas, and both ends of this glass tube 2. It is composed of a pair of cold cathodes (discharge electrodes) 3'and 4'which are respectively sealed in the parts. Here, in the configuration shown in FIGS. 1 (a) and 1 (b), the cold cathodes 3'and 4'are first metal tubular bodies having openings facing each other, for example, the inner diameter of the opening is 1.6 mm. (Wall thickness 0.2 mm), length 10 mm, other end reduced diameter type Ni cylindrical cups 3a ', 4a' and stepped type on the sealing end side of the Ni cylindrical cups 3a ', 4a' A second metal cylindrical body fitted and attached to, for example, an aluminum cylindrical body 3b ', 4b' with a reduced diameter at one end,
Ni having a diameter of 0.9 mm and a length of about 10 mm which are concentrically mounted in the Ni-made cylindrical cups 3a ', 4a' and seal the other end reduced diameter portion of the Ni-made cylindrical cups 3a ', 4a'. It is configured to include the cylindrical bodies 3c 'and 4c'. Here, the aluminum cylindrical body 3
b'and 4b 'are closely fitted and attached to the sealing end sides of the Ni cylindrical cups 3a' and 4a '. Therefore, the inner diameters of the Al cylindrical bodies 3b' and 4b 'are , Ni-made cylindrical cups 3a ′, 4a ′ are set to have substantially the same outer diameter, and the Ni-made cylindrical bodies 3c ′ are concentrically mounted in the Ni-made cylindrical cups 3a ′, 4a ′. , 4c 'are electrically connected to the lead-in wires 5 and 6 sealed and led out at the end of the glass tube 2.
【００１８】上記構成の冷陰極低圧放電灯10個をそれぞ
れ始動用トランスと組み合わせ所定の電圧を印加し、放
電開始の始動電圧をそれぞれ測定したところ、いずれも
20 V程度で、従来の同一規格の冷陰極低圧放電灯の場合
に比べて始動電圧が低下しており、この始動電圧の低下
に伴って始動用トランスの小型軽量が可能であった。ま
た、前記の試験・評価において、 500時間点灯を続行し
て輝度の推移などから発光効率および寿命なども評価し
たところ、従来の同一規格の冷陰極低圧放電灯の場合に
比べて、大幅に改善向上していることが確認された。10 cold cathode low-pressure discharge lamps having the above-mentioned structure were respectively combined with a starting transformer, a predetermined voltage was applied, and the starting voltage at the start of discharge was measured.
At about 20 V, the starting voltage was lower than in the case of conventional cold cathode low-pressure discharge lamps of the same standard, and as the starting voltage decreased, the starting transformer could be made smaller and lighter. In addition, in the above tests and evaluations, we continued to turn on the lamp for 500 hours and evaluated the luminous efficiency and life from changes in brightness, etc., and found that it was significantly improved compared to the conventional cold cathode low-pressure discharge lamp of the same standard. It was confirmed to have improved.
【００１９】なお、前記構成においては、ガラス管２の
内壁面に紫外線による刺激で発光する蛍光体層１が設け
た冷陰極低圧放電灯について説明したが、蛍光体層１の
形成を省略した構成とした場合も、従来の構造に比べて
同様にすぐれた機能を呈することを確認した。Although the cold cathode low-pressure discharge lamp in which the phosphor layer 1 which emits light upon stimulation with ultraviolet rays is provided on the inner wall surface of the glass tube 2 has been described in the above configuration, the formation of the phosphor layer 1 is omitted. It was confirmed that even in such a case, the same excellent function as that of the conventional structure is exhibited.
【００２０】実施例２ この実施例は、上記実施例１の場合に準じた構成を採っ
た規格 2 W型の冷陰極蛍光ランプの場合である。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１が
設けられ、かつ放電性媒体、たとえばアルゴンガスを封
入する外径 3.0mm，内径 2.0mmのガラス管２と、このガ
ラス管２の両端部にそれぞれ封装された一対の冷陰極
（放電電極）３′，４′とで構成されている。Example 2 This example is a case of a standard 2 W type cold cathode fluorescent lamp having a configuration similar to that of Example 1 above. That is, a phosphor layer 1 that emits light upon stimulation with ultraviolet rays is provided on the inner wall surface, and a glass tube 2 with an outer diameter of 3.0 mm and an inner diameter of 2.0 mm that encloses a discharge medium, such as argon gas, and both ends of this glass tube 2. It is composed of a pair of cold cathodes (discharge electrodes) 3'and 4'which are respectively sealed in the parts.
【００２１】この構成においては、冷陰極３′，４′
は、互いに対向する面が開口する第１の金属製筒状体、
たとえば開口部の内径 0.8mm（肉厚 0.1mm）程度，長さ
5mm，他端縮径型のNi製円筒状カップ3a′，4a′と、前
記Ni製円筒状カップ3a′，4a′の封止端側に段付型に嵌
合装着された第２の金属製筒状体、たとえば一端縮径型
のAl製円筒状体3b′，4b′と、前記Ni製円筒状カップ3
a′，4a′内に同心円的に装着され、Ni製円筒状カップ3
a′，4a′の他端縮径部を封止する外径 0.7mm，長さ 5m
m程度のNi製円柱体3c′，4c′と、前記Ni製円筒状カッ
プ3a′，4a′内に充填された水銀合金粉末およびゲッタ
剤の混合物とを具備した構成と成ってる。ここで、Al製
円筒状体3b′，4b′は、Ni製円筒状カップ3a′，4a′の
封止端側に密着的に嵌合・装着しており、このためにAl
製円筒状体3b′，4b′の内径は、Ni製円筒状カップ3
a′，4a′の外径とほぼ同じに設定されており、また、
前記Ni製円筒状カップ3a′，4a′内に同心円的に装着さ
れたNi製円柱体3c′，4c′は、ガラス管２の端部に封止
・導出された導入線５，６に電気的に接続されている。
この冷陰極蛍光ランプは、導入線５，６を介して冷陰極
３′，４′に通電すると、この通電で発生する初期プラ
ズマ中のイオンによって、冷陰極３′，４′から二次電
子が放射され、ガラス管２内で放電が開始する。そし
て、前記放電の電子エネルギーにより励起された水銀原
子の共鳴遷移によって紫外線が放射され、この紫外線を
ガラス管２内壁面に形成された蛍光体層１が吸収して、
可視光を放射して冷陰極低圧蛍光ランプとしての機能を
なす。In this structure, the cold cathodes 3 ', 4'
Is a first metal cylindrical body whose surfaces facing each other are open,
For example, the inner diameter of the opening is about 0.8 mm (wall thickness 0.1 mm) and the length
5 mm, other end reduced diameter type Ni cylindrical cups 3a ', 4a', and a second metal fitted and mounted in a stepped type on the sealing end side of the Ni cylindrical cups 3a ', 4a' A cylindrical body made of Al, for example, a cylindrical body 3b ', 4b' made of Al having a reduced diameter at one end, and the cylindrical cup 3 made of Ni described above.
Concentricly mounted in a ', 4a', Ni cylindrical cup 3
Outer diameter 0.7 mm and length 5 m that seals the reduced diameter part of the other end of a ', 4a'
It is configured to have a columnar body 3c ', 4c' made of Ni and having a size of about m, and a mixture of the mercury alloy powder and the gettering agent filled in the cylindrical cups 3a ', 4a' made of Ni. Here, the Al cylindrical bodies 3b 'and 4b' are closely fitted and attached to the sealing end sides of the Ni cylindrical cups 3a 'and 4a'.
The inner diameters of the cylindrical bodies 3b 'and 4b' made of Ni are
The outer diameters of a'and 4a 'are set to be almost the same, and
The Ni cylindrical bodies 3c 'and 4c' concentrically mounted in the Ni cylindrical cups 3a 'and 4a' are electrically connected to the introduction lines 5 and 6 sealed and led out at the end of the glass tube 2. Connected to each other.
In this cold cathode fluorescent lamp, when the cold cathodes 3'and 4'are energized through the introduction lines 5 and 6, secondary electrons are emitted from the cold cathodes 3'and 4'by the ions in the initial plasma generated by this energization. It is radiated and discharge starts in the glass tube 2. Then, ultraviolet rays are radiated by the resonance transition of mercury atoms excited by the electron energy of the discharge, and the ultraviolet rays are absorbed by the phosphor layer 1 formed on the inner wall surface of the glass tube 2,
It emits visible light and functions as a cold cathode low-pressure fluorescent lamp.
【００２２】上記構成の冷陰極低圧蛍光ランプ10個をそ
れぞれ始動用トランスと組み合わせ所定の電圧を印加
し、放電開始の始動電圧をそれぞれ測定したところ、い
ずれも20 V程度で、従来の同一規格の冷陰極低圧蛍光ラ
ンプの場合に比べて始動電圧が低下しており、この始動
電圧の低下に伴って始動用トランスの小型軽量が可能で
あった。また、前記の試験・評価において、 500時間点
灯を続行して輝度の推移などから発光効率および寿命な
ども評価したところ、従来の同一規格の冷陰極低圧蛍光
ランプの場合に比べて、大幅に改善向上していることが
確認された。A combination of the 10 cold cathode low-voltage fluorescent lamps having the above-mentioned configuration with a starting transformer was applied with a predetermined voltage, and the starting voltage at the start of discharge was measured. The starting voltage was lower than that of the cold cathode low-pressure fluorescent lamp, and the lowering of the starting voltage made it possible to reduce the size and weight of the starting transformer. In addition, in the above test / evaluation, the luminous efficiency and life were evaluated from the transition of the brightness after continuing the lighting for 500 hours, and it was significantly improved compared with the case of the conventional cold cathode low pressure fluorescent lamp of the same standard. It was confirmed to have improved.
【００２３】なお、本発明は上記実施例に限定されるも
のでなく、発明の趣旨を逸脱しない範囲でいろいろの変
形を採り得る。たとえば、発光管を成すガラス管の長さ
や直径などの寸法、放電電極の寸法，形状，材質など適
宜変更・設定することも可能である。The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. For example, it is possible to appropriately change and set the dimensions such as the length and diameter of the glass tube forming the arc tube, and the dimensions, shape and material of the discharge electrode.
【００２４】[0024]
【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、放電電極の構成に工夫を
凝らしている。すなわち、放電を行う冷陰極の構成にお
いて、互いに異なった仕事関数を有する複数種の金属を
組み合わせ、それら仕事関数の差を利用することを骨子
としている。つまり、種類の異なる金属を接合によっ
て、冷陰極の陽光柱側に負の電荷を帯電させて通電開始
以前に、すでに通電開始状態におかれるため、比較的低
い始動電圧で所要の放電・点灯が確保される。ここで、
始動電圧が比較的低くて済むことは、始動用トランスの
小型軽量化を招来するので、バックライト用光源のコン
パクト化などに寄与し、強いては液晶ディスプレイなど
の小型軽量化となる。しかも、上記始動電圧の低減化機
能、および放電発光機能は長期間に亘って安定的に保持
される。したがって、コンパクト化，長寿命化，高輝度
化，高効率化が望まれる液晶バックライト用などに適す
る冷陰極低圧放電灯の提供が可能となった。As can be seen from the above description, in the cold cathode low pressure discharge lamp according to the present invention, the structure of the discharge electrode is devised. That is, in the structure of the cold cathode that discharges, the essence is to combine a plurality of kinds of metals having different work functions and utilize the difference in the work functions. In other words, by joining different types of metals, the negative charge is charged on the positive column side of the cold cathode, and the current has already been started before the start of energization, so the required discharge and lighting can be performed with a relatively low starting voltage. Reserved. here,
The relatively low starting voltage leads to a reduction in size and weight of the starting transformer, which contributes to downsizing of the light source for the backlight, and in turn, a reduction in size and weight of the liquid crystal display. Moreover, the function of reducing the starting voltage and the function of discharging and emitting light are stably maintained for a long period of time. Therefore, it has become possible to provide a cold cathode low-pressure discharge lamp suitable for a liquid crystal backlight, which is required to be compact, have a long life, have high brightness, and have high efficiency.
【図１】本発明に係る冷陰極低圧放電灯の要部構成例を
拡大して示すもので、 (a)は縦断面図、 (b)は横断面
図。FIG. 1 is an enlarged view showing a configuration example of a main part of a cold cathode low-pressure discharge lamp according to the present invention, in which (a) is a longitudinal sectional view and (b) is a lateral sectional view.
【図２】従来の冷陰極低圧放電灯の構成例を示すもの
で、 (a)は全体の構成を示す縦断面図、 (b)は要部構成
を拡大して示す縦断面図、 (c)は要部構成を拡大して示
す横断面図。FIG. 2 shows an example of the configuration of a conventional cold cathode low-pressure discharge lamp, (a) is a vertical sectional view showing the overall configuration, (b) is an enlarged vertical sectional view showing the configuration of a main part, (c) ) Is a transverse cross-sectional view showing an enlarged main part configuration.
１……蛍光体層 ２……ガラス管 ３，３′，４，４′……冷陰極（放電電極） 3a，4a，3a′，4a′……第１の金属製円筒体（円筒状カ
ップ） 3b，4b……水銀合金−ゲッタ系混合体 3b′，4b′……第２の金属製円筒体（円筒状体） 3c′，4c′……円柱体 ５，６……導入線1 ... Phosphor layer 2 ... Glass tube 3, 3 ', 4, 4' ... Cold cathode (discharge electrode) 3a, 4a, 3a ', 4a' ... 1st metal cylinder (cylindrical cup) ) 3b, 4b ... Mercury alloy-getter system mixture 3b ', 4b' ... second metal cylinder (cylindrical) 3c ', 4c' ... cylinder 5,6 ...
Claims (2)
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
放電可能な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、第１の金属から成る円筒状カップの封止
端側対し、前記第１の金属より低い仕事係数を有する第
２の金属から成る筒状体を同心円的に装着させた構成を
採っ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 enclosing a discharge medium gas, and a pair of cold cathodes capable of discharging which are sealed at both ends of the glass tube, wherein the cold cathode is , A cylindrical body made of a second metal having a work coefficient lower than that of the first metal is concentrically attached to the sealing end side of a cylindrical cup made of the first metal. Cold cathode low pressure discharge lamp characterized by.
性媒体ガスを封入するガラス管、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放電可能な冷陰極を
具備して成る冷陰極低圧放電灯において、 前記冷陰極は、第１の金属から成る円筒状カップの封止
端側対し、前記第１の金属より低い仕事係数を有する第
２の金属から成る筒状体を同心円的に装着させ、さらに
前記円筒状カップ内に水銀合金およびゲッタ剤を充填し
た構成を採っていることを特徴とする冷陰極低圧放電
灯。2. A glass tube having an inner wall surface provided with a phosphor layer and enclosing a discharge medium gas, and a pair of cold cathodes capable of discharging which are sealed at both ends of the glass tube. In the cold cathode low-pressure discharge lamp, the cold cathode is concentric with a cylindrical body made of a second metal and having a work coefficient lower than that of the first metal, with respect to a sealing end side of a cylindrical cup made of the first metal. The cold cathode low-pressure discharge lamp is characterized in that the cylindrical cup is filled with a mercury alloy and a gettering agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4271095A JPH08241695A (en) | 1995-03-02 | 1995-03-02 | Cold cathode low pressure discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4271095A JPH08241695A (en) | 1995-03-02 | 1995-03-02 | Cold cathode low pressure discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08241695A true JPH08241695A (en) | 1996-09-17 |
Family
ID=12643636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4271095A Withdrawn JPH08241695A (en) | 1995-03-02 | 1995-03-02 | Cold cathode low pressure discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08241695A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007511880A (en) * | 2003-11-14 | 2007-05-10 | サエス・ゲッタース・ソチエタ・ペル・アツィオニ | Integrated getter and cathode with low work function for cold cathode lamp and method of manufacturing the same |
-
1995
- 1995-03-02 JP JP4271095A patent/JPH08241695A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007511880A (en) * | 2003-11-14 | 2007-05-10 | サエス・ゲッタース・ソチエタ・ペル・アツィオニ | Integrated getter and cathode with low work function for cold cathode lamp and method of manufacturing the same |
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| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
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