JPH04121942A - Cold cathode discharge lamp - Google Patents
Cold cathode discharge lampInfo
- Publication number
- JPH04121942A JPH04121942A JP23934190A JP23934190A JPH04121942A JP H04121942 A JPH04121942 A JP H04121942A JP 23934190 A JP23934190 A JP 23934190A JP 23934190 A JP23934190 A JP 23934190A JP H04121942 A JPH04121942 A JP H04121942A
- Authority
- JP
- Japan
- Prior art keywords
- cold cathode
- xenon
- discharge
- electron emitting
- 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.)
- Granted
Links
- 229910052724 xenon Inorganic materials 0.000 claims abstract description 27
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims abstract description 27
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 230000000638 stimulation Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 229910000464 lead oxide Inorganic materials 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical group O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 36
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052786 argon Inorganic materials 0.000 abstract description 2
- 229910052754 neon Inorganic materials 0.000 abstract description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 abstract description 2
- 208000028659 discharge Diseases 0.000 abstract 3
- 230000005855 radiation Effects 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 24
- 229910052759 nickel Inorganic materials 0.000 description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 230000002285 radioactive effect Effects 0.000 description 4
- 229910025794 LaB6 Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 2
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-M hexanoate Chemical compound CCCCCC([O-])=O FUZZWVXGSFPDMH-UHFFFAOYSA-M 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
- -1 xenon and argon Chemical compound 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、暗黒中での始動特性を改善した冷陰極放電灯
、特に冷陰極キセノン放電灯に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cold cathode discharge lamp, particularly a cold cathode xenon discharge lamp, with improved starting characteristics in darkness.
（従来の技術）
一般に各種放電ランプは、始動時に放電のきっかけとな
る初期電子が存在しないと電離が円滑に行われず、した
がって始動が不能もしくは困難になる。(Prior Art) In general, various types of discharge lamps do not undergo smooth ionization unless initial electrons that trigger discharge are present at the time of starting, making starting impossible or difficult.
放電のきっかけとなる初期電子としては、熱電子、光電
子、高電界により放出される電子、自然界の宇宙線など
があるが、外部からの光が届がない暗黒雰囲気中に放電
灯を留置きした場合は、光電子が存在しないため宇宙線
のみとなり、始動が困難になる。また完全に遮蔽された
ハウジングやケーシング内でランプを使用する場合は自
然界の宇宙線さえも届かなくなる場合が多く、初期電子
は期待できない。さらに、熱電子で始動する場合は、一
般に電極に熱電子放射性物質を設けこれを加熱して熱電
子の供給を行うので、加熱形の電極を必要とし、電極構
造が複雑になる。Initial electrons that trigger a discharge include thermoelectrons, photoelectrons, electrons emitted by high electric fields, and natural cosmic rays, but if a discharge lamp is kept in a dark atmosphere where no light from the outside can reach it. Since there are no photoelectrons, there are only cosmic rays, making it difficult to start. Furthermore, when a lamp is used in a completely shielded housing or casing, even natural cosmic rays often cannot reach it, and initial electrons cannot be expected. Furthermore, when starting with thermoelectrons, a thermoelectron-emitting substance is generally provided on the electrode and heated to supply thermoelectrons, so a heating type electrode is required and the electrode structure becomes complicated.
特に、電極として冷陰極を用いたランプは、始動時に冷
陰極が熱電子を放出する構造になっていないため暗黒で
の始動特性が良くない。In particular, lamps using a cold cathode as an electrode have poor starting characteristics in the dark because the cold cathode is not structured to emit thermoelectrons at the time of starting.
しかもバルブ内にキセノンを主体とした放電ガスを封入
して水銀を封入しない場合、すなわち冷陰極キセノン放
電灯の場合は、本来的にキセノンの電離特性はよくない
から放電し難く、始動電圧が高くなり、始動に時間がか
かる傾向がある。Moreover, when the bulb is filled with a discharge gas mainly composed of xenon without mercury, that is, in the case of a cold cathode xenon discharge lamp, xenon has inherently poor ionization characteristics, making it difficult to discharge, and the starting voltage is high. It tends to take a long time to start.
すなわち、冷陰極キセノン放電灯は暗黒中での始動特性
は良くない欠点がある。That is, cold cathode xenon discharge lamps have a disadvantage that they do not have good starting characteristics in the dark.
従来においてこのような冷陰極キセノン放電灯の始動特
性を改善するため、電極に”Ｎ ｉや１４７Ｐｍなどの
ような放射性同位元素（Ｒ１）を設けるか、ＣａＯを塗
布して外部光を照射することにより初期電子を放出する
手段が採用されている。Conventionally, in order to improve the starting characteristics of cold cathode xenon discharge lamps, the electrodes were provided with a radioisotope (R1) such as Ni or 147Pm, or coated with CaO and irradiated with external light. A method of emitting initial electrons has been adopted.
（発明が解決しようとする課題）
しかしながら、放射性同位元素を設けるものは、これの
取扱いに専門的な注意が必要であり、しかも電極に密封
線源の形態で封止こむ必要があるため密封線源にするた
めの構造が複雑になり、電極の製造に手間を要し、高価
になる。(Problem to be solved by the invention) However, when a radioactive isotope is provided, specialized care is required in handling it, and furthermore, it is necessary to seal the electrode in the form of a sealed source, so a sealed wire is required. The structure used as a source becomes complicated, and the manufacturing of the electrodes becomes labor-intensive and expensive.
一方、ＣａＯの場合は、外部光がないと電子を放出しな
いから完全な暗黒中では良好に機能せず、信頼性に劣る
不具合かある。On the other hand, in the case of CaO, since it does not emit electrons without external light, it does not function well in complete darkness, resulting in poor reliability.
本発明においては、取扱いが容易で、放電のきっかけと
なる初期電子を常時放出して始動特性か改善される冷陰
極キセノン放電灯を提供しようとするものである。The present invention aims to provide a cold cathode xenon discharge lamp that is easy to handle and has improved starting characteristics by constantly emitting initial electrons that trigger discharge.
Ｅ発明の構成］
（課題を解決するための手段）
本発明は、バルブの少なくとも一端内部に冷陰極を設け
、かつバルブの内部に少なくともキセノンを含む希ガス
を封入した冷陰極放電灯において、上記冷陰極に、暗黒
中に仕事関数以下の刺激エネルギーで電子を放出する電
子放射物質（Ｅｘｏ電子放射物質と称す）を設けたこと
を特徴とする。E Structure of the Invention] (Means for Solving the Problems) The present invention provides a cold cathode discharge lamp in which a cold cathode is provided inside at least one end of a bulb, and a rare gas containing at least xenon is sealed inside the bulb. It is characterized in that the cold cathode is provided with an electron emitting material (referred to as an Exo electron emitting material) that emits electrons in the dark with stimulation energy below the work function.
（作用）
本発明によると、電極に設けたＥｘｏ電子放射物質が暗
黒中でも電子を放出するから、放電のきっかけをつくり
始動性を向上させることができる。しかも、Ｅｘｏ電子
放射物質を電極に保持させたのでＥｘｏ電子放射物質か
ら放射された電子が放電破壊を促し、確実な始動が可能
になる。すなわち、Ｅｘｏ電子は低速電子であるため放
電開始に寄与する確率が相対的に低いものであり、Ｅｘ
ｏ電子がバルブ管壁付近に発生するとけい光体物質やガ
ラス成分に捕獲されて管壁に吸収されて放電破壊のため
に有効に作用しないことが心配されるが、このＥｘｏ電
子放射物質を電極に保持させておくと、管壁での吸収が
起こり難く、Ｅｘｏ電子の多くが放電開始に寄与する。(Function) According to the present invention, since the Exo electron emitting material provided on the electrode emits electrons even in the dark, it is possible to create a trigger for discharge and improve starting performance. In addition, since the Exo electron emitting material is held in the electrode, the electrons emitted from the Exo electron emitting material promote discharge destruction, making reliable starting possible. In other words, since Exo electrons are slow electrons, the probability of contributing to the initiation of discharge is relatively low;
There is a concern that if electrons are generated near the bulb tube wall, they will be captured by the phosphor material or glass component and absorbed by the tube wall, making them ineffective due to discharge destruction. If the Exo electrons are kept at 1, absorption at the tube wall is difficult to occur, and many Exo electrons contribute to the initiation of discharge.
（実施例）
以下本発明について、ｊ＠１図ないし第３図に示す第１
の実施例にもとづき説明する。(Example) The present invention will be described below with reference to the first example shown in Figures 1 to 3.
This will be explained based on an example.
第１図は液晶表示装置のバックライトなどに使用される
冷陰極キセノン放電灯の断面を示し、１０はガラスバル
ブである。FIG. 1 shows a cross section of a cold cathode xenon discharge lamp used as a backlight for a liquid crystal display device, and 10 is a glass bulb.
本実施例のバルブ１０は直管形をなしており、外径が６
．５１１内径が５゜０■の略真円形となっており、バル
ブ１０の全長は例えば２７０ ａｍ。The valve 10 of this embodiment has a straight pipe shape, and has an outer diameter of 6.
．． 511 has a substantially perfect circular shape with an inner diameter of 5°0mm, and the total length of the valve 10 is, for example, 270 am.
電極間間距離が２５０ｍｍに設定された放電空間１１を
有している。It has a discharge space 11 with an inter-electrode distance of 250 mm.
バルブ１０の放電空間１１に面した内面にはけい光体被
膜１２が形成されている。けい光体被膜１２は、例えば
各々ブルー ブリーノ、レッドに発光領域を有するけい
光体を混合した３波長発光けい光体が使用されている。A phosphor coating 12 is formed on the inner surface of the bulb 10 facing the discharge space 11 . For the phosphor film 12, a three-wavelength emitting phosphor is used, for example, which is a mixture of phosphors having blue burino and red light emitting regions.
バルブ１０の両端はボタンステム１３．１Ｂで閉封され
ており、これらステム１３．１３にはそれぞれ電極１５
．１５が設けられている。電極１５．１５は冷陰極であ
り、電極本体１６と、この電極本体１６に接続されたリ
ード線１７とで構成されており、このリード線１７がボ
タンステム１３を気密に貫通されている。Both ends of the bulb 10 are closed by button stems 13.1B, each of which is provided with an electrode 15.
．． 15 are provided. The electrode 15.15 is a cold cathode and is composed of an electrode body 16 and a lead wire 17 connected to the electrode body 16, and the lead wire 17 passes through the button stem 13 in an airtight manner.
上記電極本体１６は、第２図に示す通り、例えば円筒形
状のニッケル管１６ａと、このニッケル管１６ａ内に充
填されたほう化ランタンＬａＢ６等からなる電子放射物
質１６ｂとを有している。As shown in FIG. 2, the electrode body 16 includes, for example, a cylindrical nickel tube 16a and an electron emitting material 16b made of lanthanum boride LaB6 or the like filled in the nickel tube 16a.
なお、この電子放射物質１６ｂは仕事関数以上の刺激エ
ネルギーで電子を放出するものであり、始動電圧が印加
された場合に放電を誘起するためのものであり、後述す
る本発明のＥｘｏ電子放射物質とは異なる。Note that this electron emitting material 16b emits electrons with stimulation energy higher than the work function, and is used to induce discharge when a starting voltage is applied. It is different from.
上記ニッケル管１６ａ内に充填されたほう化ランタンＬ
ａＢ６からなる電子放射物質１６ｂは、ニッケルＮｉと
混合されて上記ニッケル管１６ａに充填されている。Lanthanum boride L filled in the nickel tube 16a
The electron emitting material 16b made of aB6 is mixed with nickel Ni and filled into the nickel tube 16a.
つまり、ニッケル管１６ａ内に、ニッケル粉末と、１０
〜２０容量％のＬａＢ６粉末を混合した混合粉末を充填
し、上記ニッケル管１６ａを冷間伸線またはスェージン
グ加工する。この後熱処理してニッケル粉末を溶融して
ＬａＢ６を固溶者する。これにてニッケル管１６ａにＬ
ａＢ６からなる電子放射物質１６ｂが保持される。That is, in the nickel tube 16a, nickel powder and 10
A mixed powder containing ~20% by volume of LaB6 powder is filled, and the nickel tube 16a is subjected to cold wire drawing or swaging processing. Thereafter, heat treatment is performed to melt the nickel powder and form a solid solution of LaB6. With this, L is attached to the nickel tube 16a.
An electron emitting substance 16b made of aB6 is held.
このような電極本体１６の一端にはリード線１７が溶接
されるが、リード線１７はジュメット線が用いられる。A lead wire 17 is welded to one end of the electrode body 16, and the lead wire 17 is a Dumet wire.
バルブ１０の上記放電空間１１には、キセノンを主体と
したガス、例えばキセノンとアルゴン、またはキセノン
とネオンなどが封入されている。The discharge space 11 of the bulb 10 is filled with a gas mainly consisting of xenon, such as xenon and argon, or xenon and neon.
上記電極１５．１５には、電極本体１６の外周面に、Ｅ
ｘｏ電子を放射する物質からなる層１８．１８が形成さ
れている。このＥｘｏ電子放射物質層１８は、例えばア
ルミナＡｌ１２０３、マグネシアＭｇＯなどからなる。The electrode 15.15 has E on the outer peripheral surface of the electrode body 16.
A layer 18.18 is formed of a material that emits xo electrons. This Exo electron emitting material layer 18 is made of, for example, alumina Al1203, magnesia MgO, or the like.
本実施例ではＥｘｏ電子放射物質層１８としてアルミナ
粉末の層が採用されている。In this embodiment, an alumina powder layer is employed as the Exo electron emitting material layer 18.
上記アルミナからなるＥｘｏ電子放射物質層１８は、例
えば酢酸ブチルに、微粒子アルミナと硝化綿とを混入し
て懸濁液を作り、この懸濁液を電極本体１６の外周面に
塗布し、これを焼成してセラミック化させることにより
形成することができる。The Exo electron emitting material layer 18 made of alumina is prepared by mixing fine particles of alumina and nitrified cotton in butyl acetate to form a suspension, and applying this suspension to the outer peripheral surface of the electrode body 16. It can be formed by firing to form a ceramic.
なお、他の方法としては、有機化合アルミ液、例えばア
ルコキシドアルミ液を電極本体１６の外周面に塗布し、
これを乾燥後、焼成してアルミナ膜として形成すること
もできる。Note that another method is to apply an organic compound aluminum liquid, such as an alkoxide aluminum liquid, to the outer peripheral surface of the electrode body 16,
This can also be dried and then fired to form an alumina film.
また、アルミを酸化物の形態でなくＡＩの状態で電極本
体１６の外周面に塗布し、バルブの封止、排気工程の加
熱で酸化させるようにしてもよい。Alternatively, aluminum may be applied to the outer circumferential surface of the electrode body 16 in an AI state rather than in the form of an oxide, and may be oxidized by heating during the valve sealing and exhaust steps.
このような、冷陰極キセノン放電灯は、図示しない高周
波トランジスタインバータ回路を通じて周波数５０ＫＨ
ｚで高周波点灯されるようになっている。Such a cold cathode xenon discharge lamp is operated at a frequency of 50 KH through a high frequency transistor inverter circuit (not shown).
It is designed to be lit at a high frequency at z.
上記のような構成の冷陰極キセノン放電灯は、暗黒中で
も容易に始動し、始動時間が大幅に短縮される。The cold cathode xenon discharge lamp configured as described above can be started easily even in the dark, and the starting time is significantly shortened.
すなわち、電極１５の外周面に形成したＥｘ。That is, Ex formed on the outer peripheral surface of the electrode 15.
電子放射物質層１８、例えばアルミナ被膜は、常温で暗
黒中であっても高電界を付与することなく常に電子を放
出している。The electron emitting material layer 18, for example, an alumina coating, constantly emits electrons without applying a high electric field even at room temperature and in the dark.
このため、このＥｘａ電子が放電のきっかけとなり、こ
の冷陰極キセノン放電灯を暗黒中で、周囲が宇宙線から
遮断された空間内で点灯させても速やかに点灯する。Therefore, the Exa electrons trigger a discharge, and even if the cold cathode xenon discharge lamp is turned on in the dark, in a space where the surrounding area is shielded from cosmic rays, the lamp will turn on quickly.
また、このＥｘｏ電子放射物質層１８は電極１５に設け
たので、Ｅｘｏ電子放射物質層１８から放射された電子
は確実に放電空間に飛び、管壁に吸収されることな（放
電破壊のために有効に作用し、よってＥｘｏ電子の多く
が放電開始に寄与するので、安定した始動か可能になる
。In addition, since this Exo electron emitting material layer 18 is provided on the electrode 15, the electrons emitted from the Exo electron emitting material layer 18 will surely fly into the discharge space and will not be absorbed by the tube wall (because of discharge breakdown). Since many of the Exo electrons contribute to the initiation of discharge, stable starting is possible.
これらを実験した結果について、第３図にもとづき説明
する。The results of these experiments will be explained based on FIG.
第２図は暗黒中での始動時における点灯開始に要する時
間と、その発生率（相対値）との関係を調べた特性図で
ある。FIG. 2 is a characteristic diagram examining the relationship between the time required to start lighting during startup in darkness and its occurrence rate (relative value).
図中、実線Ａが第１図に示すように、電極１５にアルミ
ナからなるＥｘｏ電子放射物質層１８を形成したランプ
の場合である。In the figure, the solid line A indicates the case of a lamp in which the Exo electron emitting material layer 18 made of alumina is formed on the electrode 15, as shown in FIG.
また、破線ＢはＥｘｏ電子放射物質層１８を備えていな
い従来のランプの場合である。Moreover, the broken line B is the case of a conventional lamp that does not include the Exo electron emissive material layer 18.
上記特性図から明らかなように、第１図に示す構成のラ
ンプＡは、きわめて短時間にかつ確実に始動する。As is clear from the above characteristic diagram, the lamp A having the configuration shown in FIG. 1 starts up reliably in a very short time.
これに比べてＥｘｏ電子放射物質層１８を持たないラン
プＢは、始動性がよくないことが判る。In comparison, it can be seen that lamp B, which does not have the Exo electron emitting material layer 18, has poor startability.
また、放射性同位元素を用いた従来のランプの場合、平
均点灯遅れ時間は０．０１秒であり、ＣａＯを塗布した
従来のランプの場合、平均点灯遅れ時間は２２．．１０
秒であり、これに対しＥｘｏ電子放射物質層１８を用い
た本発明のランプは平均点灯遅れ時間が０．０１秒で放
射性同位元素を用いたランプと同等の機能が期待できる
。Furthermore, in the case of a conventional lamp using a radioactive isotope, the average lighting delay time is 0.01 seconds, and in the case of a conventional lamp coated with CaO, the average lighting delay time is 22 seconds. ．． 10
On the other hand, the lamp of the present invention using the Exo electron emitting material layer 18 has an average lighting delay time of 0.01 seconds, and can be expected to have the same function as a lamp using a radioisotope.
しかも、本発明のランプであれば、取扱いに多大な注意
を要する放射性同位元素を用いなくてもよいから取扱い
が容易となり、電極の構造も従来の冷陰極を変更する必
要がなく、構造が簡単で製造に手間を要さず安価になる
。Moreover, the lamp of the present invention does not require the use of radioactive isotopes that require great care in handling, making it easy to handle, and the structure of the electrode is simple, as there is no need to change the conventional cold cathode. It requires less time and effort to manufacture and is cheaper.
また、外部光がなくても始動が可能であるから、信頼性
が向上することになる。Furthermore, since starting is possible without external light, reliability is improved.
なお、本発明は上記の実施例に制約されるものではない
。Note that the present invention is not limited to the above embodiments.
すなわち、第１図の場合、電極本体１６を構成したニッ
ケル管１６ａの外周面にＥｘｏ電子放射物質層１８を被
着したが、第４図に示す第２の実施例のように、ニッケ
ル管１６ａの内面に、仕事関数以上の刺激エネルギーで
電子を放出する電子放射物質１６ｂに代わってＥｘｏ電
子放射物質１８を充填してもよい。That is, in the case of FIG. 1, the Exo electron emitting material layer 18 is coated on the outer peripheral surface of the nickel tube 16a that constitutes the electrode body 16, but as in the second embodiment shown in FIG. The inner surface of the substrate may be filled with an Exo electron emitting material 18 instead of the electron emitting material 16b that emits electrons with stimulation energy higher than the work function.
また、第５図に示す第３の実施例のように、ニッケル管
１６ａの内面に、Ｅｘｏ電子放射物質層１８を形成し、
このＥｘｏ電子放射物質層１８の内側に空孔を確保する
ようにしてもよい。Further, as in the third embodiment shown in FIG. 5, an Exo electron emitting material layer 18 is formed on the inner surface of the nickel tube 16a,
Holes may be provided inside this Exo electron emitting material layer 18.
また、いづれか一方の電極１５のみにＥｘｏ電子放射物
質層１８を形成してもよい。Further, the Exo electron emitting material layer 18 may be formed only on one of the electrodes 15.
さらに、第１図の場合、バルブ１０の両端部にそれぞれ
内部電極として封装した場合を説明したが、本発明はこ
れに限らず、一方の電極は外部電極で構成してもよい。Furthermore, in the case of FIG. 1, a case has been described in which both ends of the bulb 10 are sealed as internal electrodes, respectively, but the present invention is not limited to this, and one electrode may be configured as an external electrode.
すなわち、第６図に示す第４の実施例においては、バル
ブ１０の一端に冷陰極１５を設け、ノ１ルブ１０の外面
にバルブ軸方向に沿って帯形状をなして延びる外部電極
２０を設けた冷陰極キセノン放電灯を示す。このような
構成のランプはメータの指針などに使用されるのに好適
し、内径が１０ａｍ以下の細い形状とされる。That is, in the fourth embodiment shown in FIG. 6, a cold cathode 15 is provided at one end of the bulb 10, and an external electrode 20 is provided on the outer surface of the knob 10 in a band shape extending along the bulb axis direction. This figure shows a cold cathode xenon discharge lamp. A lamp having such a configuration is suitable for use as a meter pointer, and has a narrow shape with an inner diameter of 10 am or less.
このような冷陰極キセノン放電ランプであっても、冷陰
極１５にアルミナやマグネシアなどからなるＥｘｏ電子
放射物質層１８を設ければ、暗黒中でもきわめて短時間
に始動する。Even in such a cold cathode xenon discharge lamp, if an Exo electron emitting material layer 18 made of alumina, magnesia, etc. is provided on the cold cathode 15, the lamp can be started in a very short time even in the dark.
なお、Ｅｘｏ電子放射物質層１８は、アルミナＡｌ１２
０ｓやマグネシアＭｇＯのほかに、酸化亜鉛ＺｎＯや酸
化鉛ＰｂＯであっても同様の効果があることが確認され
ている。Note that the Exo electron emitting material layer 18 is made of alumina Al12
In addition to 0s and magnesia MgO, it has been confirmed that zinc oxide ZnO and lead oxide PbO have similar effects.
さらに、本発明はバルブ内面にけい光体被膜を形成した
ランプに制約されるものではない。Furthermore, the present invention is not limited to lamps having a phosphor coating formed on the inner surface of the bulb.
また、バルブの断面形状は円形、楕円形または長円形の
いずれの場合であってもよい。Further, the cross-sectional shape of the bulb may be circular, oval, or oval.
そして、本発明は、バルブの内部に冷陰極を設けたラン
プに適用されるもので、既に述べた通り冷陰極ランプの
場合は始動時に冷陰極が熱電子を放出する構造となって
いないため、暗黒での始動特性が悪い。しかもバルブ内
にキセノンを主体とした放電ガスを封入した場合、すな
わち冷陰極キセノン放電灯では、キセノンの電離特性が
よくないので放電し難く、始動電圧が高くなり、始動に
時間がかかる傾向がある。The present invention is applied to a lamp in which a cold cathode is provided inside the bulb, and as mentioned above, in the case of a cold cathode lamp, the cold cathode does not have a structure in which the cold cathode emits thermoelectrons at the time of starting. Poor starting characteristics in the dark. Moreover, when a discharge gas containing mainly xenon is filled in the bulb, that is, in a cold cathode xenon discharge lamp, the ionization characteristics of xenon are not good, so it is difficult to discharge, the starting voltage is high, and it tends to take a long time to start. .
したがって本発明は、このような冷陰極キセノン放電灯
に適用して有効であることが判る。Therefore, it can be seen that the present invention is effective when applied to such cold cathode xenon discharge lamps.
［発明の効果］
以上説明したように本発明によれば、電極に設けたＥｘ
ｏ電子放射物質が暗黒中でも電子を放出するから、放電
のきっかけをつくり始動性を向上させることができる。[Effects of the Invention] As explained above, according to the present invention, the Ex
o Since the electron emitting material emits electrons even in the dark, it can create a trigger for discharge and improve starting performance.
このため、放射性同位元素を用いなくてもよいから取扱
いが容易となり、電極の構造も従来の冷陰極を変更する
必要がなく、構造か簡単で製造に手間を要さず安価にな
る。また、外部光がなくても始動が可能であるから、信
頼性か向上する。Therefore, since there is no need to use a radioactive isotope, handling becomes easier, and the structure of the electrode does not need to be changed from the conventional cold cathode, and the structure is simple and requires no effort to manufacture, making it inexpensive. Furthermore, since starting is possible without external light, reliability is improved.
しかも、Ｅｘｏ電子放射物質は電極に取着したので、Ｅ
ｘｏ電子放射物質から放射された電子が放電空間で良好
に放電破壊を促し、確実な始動が可能になる。Moreover, since the Exo electron emitting material was attached to the electrode, the E
The electrons emitted from the xo electron emitting material favorably promote discharge destruction in the discharge space, making reliable starting possible.
第１図は本発明の第１の実施例を示す冷陰極キセノン放
電灯の断面図、第２図は冷陰極の断面図、第３図は始動
時間の特性図、第４図は本発明の第２の実施例を示す冷
陰極の断面図、第５図は本発明の第３の実施例を示す冷
陰極の断面図、第６図は本発明の第４の実施例を示す冷
陰極キセノン放電灯の断面図である。
１０・・・バルブ、１１・・・放電空間、１２・・・け
い光体被膜、１５・・・冷陰極、１６・・・電極本体、
１７・・・リ
ド線、
８・・・Ｅ
０電子放射物質層。FIG. 1 is a sectional view of a cold cathode xenon discharge lamp showing a first embodiment of the present invention, FIG. 2 is a sectional view of a cold cathode, FIG. 3 is a characteristic diagram of starting time, and FIG. A sectional view of a cold cathode showing a second embodiment, FIG. 5 a sectional view of a cold cathode showing a third embodiment of the present invention, and FIG. 6 a cold cathode xenon showing a fourth embodiment of the present invention. It is a sectional view of a discharge lamp. DESCRIPTION OF SYMBOLS 10... Bulb, 11... Discharge space, 12... Phosphor coating, 15... Cold cathode, 16... Electrode body,
17... Lido line, 8... E0 electron emitting material layer.
Claims (2)
つバルブの内部に少なくともキセノンを含む希ガスを封
入した冷陰極放電灯において、上記冷陰極に、暗黒中に
仕事関数以下の刺激エネルギーで電子を放出する電子放
射物質を設けたことを特徴とする冷陰極放電灯。(1) In a cold cathode discharge lamp in which a cold cathode is provided inside at least one end of the bulb and a rare gas containing at least xenon is sealed inside the bulb, electrons are applied to the cold cathode in the dark with stimulation energy below the work function. A cold cathode discharge lamp characterized by being provided with an electron emitting substance that emits.
グネシウム、酸化亜鉛または酸化鉛であることを特徴と
する第１の請求項に記載した冷陰極放電灯。(2) The cold cathode discharge lamp according to claim 1, wherein the electron emitting substance is aluminum oxide, magnesium oxide, zinc oxide or lead oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2239341A JP2776470B2 (en) | 1990-09-10 | 1990-09-10 | Cold cathode discharge lamp, illumination device using the same, and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2239341A JP2776470B2 (en) | 1990-09-10 | 1990-09-10 | Cold cathode discharge lamp, illumination device using the same, and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04121942A true JPH04121942A (en) | 1992-04-22 |
| JP2776470B2 JP2776470B2 (en) | 1998-07-16 |
Family
ID=17043296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2239341A Expired - Fee Related JP2776470B2 (en) | 1990-09-10 | 1990-09-10 | Cold cathode discharge lamp, illumination device using the same, and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2776470B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07220678A (en) * | 1994-02-02 | 1995-08-18 | Techno Baitaru Kogyo Kk | Electrode material for discharge lamp and manufacture of discharge lamp |
| KR100355030B1 (en) * | 2000-03-24 | 2002-10-05 | 금호전기주식회사 | Structure of electrode for cold cathode fluorescent lamp |
| JP2003016994A (en) * | 2001-06-27 | 2003-01-17 | Harison Toshiba Lighting Corp | Cold cathode fluorescent lamp and lighting system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599849A (en) * | 1982-07-09 | 1984-01-19 | Okaya Denki Sangyo Kk | High frequency discharge lamp |
-
1990
- 1990-09-10 JP JP2239341A patent/JP2776470B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599849A (en) * | 1982-07-09 | 1984-01-19 | Okaya Denki Sangyo Kk | High frequency discharge lamp |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07220678A (en) * | 1994-02-02 | 1995-08-18 | Techno Baitaru Kogyo Kk | Electrode material for discharge lamp and manufacture of discharge lamp |
| KR100355030B1 (en) * | 2000-03-24 | 2002-10-05 | 금호전기주식회사 | Structure of electrode for cold cathode fluorescent lamp |
| JP2003016994A (en) * | 2001-06-27 | 2003-01-17 | Harison Toshiba Lighting Corp | Cold cathode fluorescent lamp and lighting system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2776470B2 (en) | 1998-07-16 |
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