JPH1074484A - Cold cathode fluorescent lamp - Google Patents
Cold cathode fluorescent lampInfo
- Publication number
- JPH1074484A JPH1074484A JP23215596A JP23215596A JPH1074484A JP H1074484 A JPH1074484 A JP H1074484A JP 23215596 A JP23215596 A JP 23215596A JP 23215596 A JP23215596 A JP 23215596A JP H1074484 A JPH1074484 A JP H1074484A
- Authority
- JP
- Japan
- Prior art keywords
- emitting layer
- fluorescent lamp
- glass bulb
- light emitting
- cathode fluorescent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011521 glass Substances 0.000 claims abstract description 39
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 26
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims abstract description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 14
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052753 mercury Inorganic materials 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 39
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 239000011247 coating layer Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- -1 Cerium-terbium-activated lanthanum phosphate phosphor Chemical class 0.000 description 2
- 229910052693 Europium Inorganic materials 0.000 description 2
- 239000005388 borosilicate glass Substances 0.000 description 2
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000005355 lead glass Substances 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- LWNCNSOPVUCKJL-UHFFFAOYSA-N [Mg].[P] Chemical compound [Mg].[P] LWNCNSOPVUCKJL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- DIKKUZBQLHOPIS-UHFFFAOYSA-N mercury titanium Chemical compound [Ti].[Ti].[Ti].[Hg] DIKKUZBQLHOPIS-UHFFFAOYSA-N 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 150000003437 strontium Chemical class 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は冷陰極蛍光ランプ
に関し、特にパソコン，ワ−プロなどのＯＡ機器におけ
る液晶表示装置に適用されるバックライトユニットの冷
陰極蛍光ランプにおいて、冷陰極蛍光ランプに照射され
る外来光が乏しい環境下での始動特性の改善に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold-cathode fluorescent lamp, and more particularly to a cold-cathode fluorescent lamp of a backlight unit applied to a liquid crystal display device in OA equipment such as a personal computer and a word processor. The present invention relates to the improvement of the starting characteristics in an environment where the external light is scarce.
【０００２】[0002]
【従来の技術】一般にこの種蛍光ランプは、例えば図４
に示すように、ガラスバルブ１の内面に蛍光体よりなる
発光層２を形成すると共に、ガラスバルブ１のそれぞれ
の端部に電極３，３を配置し、かつガラスバルブ１の内
部空間にはアルゴンなどの希ガス及び水銀が封入して構
成されている。尚、電極３，３にはリ−ド線４，４が接
続されており、ガラスバルブ１の端部から外部に導出さ
れている。2. Description of the Related Art Generally, this kind of fluorescent lamp is, for example, shown in FIG.
As shown in FIG. 1, a light emitting layer 2 made of a phosphor is formed on the inner surface of a glass bulb 1, electrodes 3 and 3 are arranged at respective ends of the glass bulb 1, and argon gas is supplied to an inner space of the glass bulb 1. Noble gas and mercury are sealed. Lead wires 4 and 4 are connected to the electrodes 3 and 3, respectively, and are led out from the end of the glass bulb 1.
【０００３】このように構成された蛍光ランプは、ノ−
ト形パソコン，ワ−プロなどのＯＡ機器における液晶表
示装置のバックライトユニットに適用した場合、ガラス
バルブ１の外径が例えば６ｍｍ以下と細いこともあって
ランプ輝度が高く、望ましい表示を得ることができると
いう特徴を有する。[0003] The fluorescent lamp constructed as described above has a
When applied to a backlight unit of a liquid crystal display device in OA equipment such as a personal computer and a word processor, the outer diameter of the glass bulb 1 is as small as 6 mm or less, for example, so that the lamp brightness is high and a desired display is obtained. The feature is that it can be.
【０００４】ところで、これらの機器において、液晶表
示装置のバックライトユニット部分は密閉構造に構成さ
れている関係で、冷陰極蛍光ランプには外来光が照射さ
れることは殆んどなく、ほぼ暗黒状態におかれている。
従って、外来光の存在下では、周波数が５０〜６０ＫＨ
ｚ，電圧が１０００〜１２００Ｖ程度の高周波高電圧を
電極３，３に印加した場合にはほぼ２０〜３０ｍＳ程度
で点灯するものの、かかる暗黒状態では１０〜２０Ｓも
の間、全く点灯しないことがあり、その始動特性が極め
て不安定になる。このために、時には、ＯＡ機器を正常
に使用できなくなるという問題が発生する。In these devices, since the backlight unit of the liquid crystal display device has a closed structure, the cold cathode fluorescent lamp is hardly irradiated with extraneous light, and is almost dark. You are in a state.
Therefore, in the presence of extraneous light, the frequency is 50-60 KH
z, when a high frequency high voltage of about 1000 to 1200 V is applied to the electrodes 3 and 3, the light is turned on at about 20 to 30 mS, but in such a dark state, the light may not be turned on for 10 to 20 S at all, Its starting characteristics become extremely unstable. This sometimes causes a problem that the OA device cannot be used normally.
【０００５】この原因は、次のように考えられる。即
ち、一般に蛍光ランプは、始動に際し、初期電子が存在
しないと電離が円滑に行なわれないために、始動ができ
ないか若しくは困難になる。通常、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
出される電子及び自然界の宇宙線などがある。しかし、
例えばノ−トパソコンなどのように外界から完全に遮断
された部所にバックライトユニットが配置される場合に
は、蛍光ランプに自然界の宇宙線が届かなくなり、初期
電子は期待できなくなる。このために、電極として冷陰
極を使用しているこの種蛍光ランプでは熱電子の放出も
期待できず、始動特性が著しく不安定になるものと考え
られる。[0005] The cause is considered as follows. That is, in general, a fluorescent lamp cannot be started or is difficult to start because the ionization is not performed smoothly unless initial electrons are present at the time of starting. Normally, initial electrons that trigger discharge include thermoelectrons, photoelectrons, electrons emitted by a high electric field, and cosmic rays in the natural world. But,
For example, when a backlight unit is placed in a place completely shielded from the outside such as a notebook personal computer, natural cosmic rays do not reach the fluorescent lamp, and initial electrons cannot be expected. For this reason, in this type of fluorescent lamp using a cold cathode as an electrode, emission of thermoelectrons cannot be expected, and the starting characteristics are considered to be extremely unstable.
【０００６】[0006]
【発明が解決しようとする課題】従って、従来において
は、このような問題を解決するために、例えば図５に示
す冷陰極蛍光ランプが提案されている（特開平６−１６
３００２号公報参照）。この蛍光ランプは、ガラスバル
ブ１の内面に平均粒径が０．０５〜１μｍのα−アルミ
ナからなる被覆層５を形成すると共に、その上に、発光
層２を形成して構成されている。尚、被覆層５を省略
し、α−アルミナを発光層２に混入して構成することも
できる。Therefore, in order to solve such a problem, for example, a cold cathode fluorescent lamp shown in FIG. 5 has been proposed (Japanese Patent Laid-Open No. 6-16).
No. 3002). This fluorescent lamp is formed by forming a coating layer 5 made of α-alumina having an average particle diameter of 0.05 to 1 μm on the inner surface of a glass bulb 1 and forming a light emitting layer 2 thereon. The coating layer 5 may be omitted, and α-alumina may be mixed into the light emitting layer 2.
【０００７】この提案によれば、α−アルミナの被覆層
５は、常温で暗黒中においても、高電界を付与しなくて
も放電空間に常時電子を放出している。このために、こ
のα−アルミナの被覆層５が放電のきっかけとなり、暗
黒状態でも確実に冷陰極蛍光ランプを始動させることが
できるものである。According to this proposal, the α-alumina coating layer 5 constantly emits electrons into the discharge space at room temperature even in darkness without applying a high electric field. For this reason, the coating layer 5 of α-alumina triggers the discharge, and the cold cathode fluorescent lamp can be reliably started even in a dark state.
【０００８】しかしながら、この蛍光ランプは、その発
光層２が取り扱い時，輸送時などの振動，衝撃などによ
ってガラスバルブ１の内面から剥離し易く、外観特性の
みならず、軸方向の照度分布が不均一になるという課題
を有している。即ち、この種蛍光ランプでは、それを水
平状態にして１ｍの高さからコンクリ−ト面に自由落下
させて発光層２の剥離状況を測定する落下試験が行なわ
れており、発光層の剥離は直径が１ｍｍのものが１個ま
では良品として判定されている。が、この提案にかかる
蛍光ランプでは、極端な場合にはガラスバルブ１の全内
面の２０〜５０％の範囲に亘って発光層２が剥離してし
まい、外観特性は勿論のこと、照度をも著しく損なわれ
るという問題がある。However, in this fluorescent lamp, the light-emitting layer 2 is easily peeled off from the inner surface of the glass bulb 1 due to vibration or impact during handling, transportation, or the like. There is a problem of uniformity. That is, in this type of fluorescent lamp, a drop test is performed in which the light-emitting layer 2 is dropped horizontally from a height of 1 m to a concrete surface to measure the peeling state of the light-emitting layer 2. Up to one piece having a diameter of 1 mm is determined to be good. However, in the fluorescent lamp according to this proposal, in an extreme case, the light-emitting layer 2 is peeled over a range of 20 to 50% of the entire inner surface of the glass bulb 1, so that not only the appearance characteristics but also the illuminance are reduced. There is a problem that it is significantly damaged.
【０００９】それ故に、本発明の目的は、比較的に簡単
な構成にて暗黒状態での始動特性を損なうことなく、発
光層の振動などによる剥離を実用上支障のない程度に抑
えることのできる冷陰極蛍光ランプを提供することにあ
る。Therefore, an object of the present invention is to make it possible to suppress peeling due to vibration of the light-emitting layer to a level that does not hinder practical use with a relatively simple structure without impairing the starting characteristics in the dark state. It is to provide a cold cathode fluorescent lamp.
【００１０】[0010]
【課題を解決するための手段】従って、本発明は、上述
の目的を達成するために、内面に発光層を有するガラス
バルブのそれぞれの端部に電極を配置すると共に、ガラ
スバルブの内部空間に希ガス及び水銀を封入した冷陰極
蛍光ランプにおいて、前記発光層を蛍光体とα−アルミ
ナと金属硼酸塩とを含む混合体にて構成し、かつα−ア
ルミナ及び金属硼酸塩の混合体に占める割合を、蛍光体
重量の０．５〜４．０％及び０．１〜１．０％の範囲に
設定したことを特徴とし、又、本発明の第２の発明は、
前記発光層をガラスバルブの内面のほぼ全長に亘って形
成したことを特徴とし、第３の発明は、前記ガラスバル
ブの外径を１．５〜６．０ｍｍに設定したことを特徴と
する。SUMMARY OF THE INVENTION Accordingly, in order to achieve the above-mentioned object, the present invention provides an electrode at each end of a glass bulb having a light-emitting layer on the inner surface, and an electrode in an inner space of the glass bulb. In a cold cathode fluorescent lamp in which a rare gas and mercury are sealed, the light emitting layer is composed of a mixture containing a phosphor, α-alumina and metal borate, and occupies a mixture of α-alumina and metal borate. The ratio is set in the range of 0.5 to 4.0% and 0.1 to 1.0% of the phosphor weight, and the second invention of the present invention is characterized in that:
The light emitting layer is formed over substantially the entire length of the inner surface of the glass bulb, and the third invention is characterized in that the outer diameter of the glass bulb is set to 1.5 to 6.0 mm.
【００１１】[0011]
【発明の実施の形態】次に、本発明にかかる冷陰極蛍光
ランプの１実施例について図１を参照して説明する。同
図において、１はバルブ外径が１．５〜６．０ｍｍ程
度、好ましくは１．５〜３．０ｍｍの硼・珪酸ガラスよ
りなるガラスバルブであって、それの内面には発光層２
Ａが形成されている。尚、ガラスバルブ１は、鉛ガラ
ス，ソ−ダガラス，低鉛ガラスなども使用できる。この
発光層２Ａは少なくとも蛍光体とα−アルミナと金属硼
酸塩とを含む混合体にて構成されており、しかも、α−
アルミナ及び金属硼酸塩の混合体に占める割合は蛍光体
重量の０．５〜４．０％及び０．１〜１．０％の範囲に
設定されている。尚、α−アルミナの平均粒径は例えば
０．０５〜１μｍの範囲に設定することが望ましい。Next, an embodiment of a cold cathode fluorescent lamp according to the present invention will be described with reference to FIG. In the figure, reference numeral 1 denotes a glass bulb made of borosilicate glass having an outer diameter of about 1.5 to 6.0 mm, preferably 1.5 to 3.0 mm, and a light emitting layer 2 on its inner surface.
A is formed. The glass bulb 1 may be made of lead glass, soda glass, low lead glass or the like. The light emitting layer 2A is composed of a mixture containing at least a phosphor, α-alumina and metal borate.
The proportion of the mixture of alumina and metal borate is set in the range of 0.5 to 4.0% and 0.1 to 1.0% of the phosphor weight. The average particle size of α-alumina is desirably set, for example, in the range of 0.05 to 1 μm.
【００１２】特に、この発光層２Ａはガラスバルブ１の
内面のほぼ全長に亘って形成されており、その端部部分
には後述する電極が近接するように形成されている。
尚、発光層２Ａにおける蛍光体としては、例えばハロリ
ン酸塩蛍光体，希土類蛍光体などの蛍光体を目的に応じ
て１種類を単独で又は複数種類を混合して使用される。
そして、ガラスバルブ１のそれぞれの端部には電極３，
３が配置されている。この電極３，３にはリ−ド線４，
４が電気的に接続されており、ガラスバルブ１の端部か
ら外部に導出されている。尚、ガラスバルブ１の内部空
間にはアルゴン，ネオン，キセノンなどの希ガス及び水
銀が所要量封入されている。In particular, the light emitting layer 2A is formed over substantially the entire length of the inner surface of the glass bulb 1, and an electrode to be described later is formed close to an end portion thereof.
As the phosphor in the light emitting layer 2A, for example, a phosphor such as a halophosphate phosphor, a rare earth phosphor, or the like may be used singly or in combination of two or more depending on the purpose.
Then, at each end of the glass bulb 1, electrodes 3,
3 are arranged. Lead wires 4 are connected to these electrodes 3 and 3, respectively.
4 is electrically connected, and is led out from the end of the glass bulb 1. A required amount of a rare gas such as argon, neon, or xenon and mercury are sealed in the internal space of the glass bulb 1.
【００１３】この実施例によれば、発光層２Ａは少なく
とも蛍光体とα−アルミナと金属硼酸塩とを含む混合体
にて構成されており、しかも、α−アルミナ及び金属硼
酸塩の混合体に占める割合は蛍光体重量の０．５〜４．
０％及び０．１〜１．０％の範囲に設定されているため
に、振動，衝撃などが付与されても、発光層２Ａがガラ
スバルブ１の内面からの剥離を効果的に抑制できる。従
って、外観特性は勿論のこと、軸方向の照度分布をも改
善できる。According to this embodiment, the light emitting layer 2A is composed of a mixture containing at least a phosphor, α-alumina and a metal borate. The occupying ratio is 0.5 to 3.
Since they are set in the range of 0% and 0.1 to 1.0%, even if vibration, impact, or the like is applied, the light-emitting layer 2A can be effectively prevented from peeling from the inner surface of the glass bulb 1. Therefore, the illuminance distribution in the axial direction can be improved as well as the appearance characteristics.
【００１４】しかしながら、α−アルミナの占める割合
が０．５％未満になると、暗黒状態での始動特性が損な
われ、始動時間のバラツキが大きくなる。逆に、その割
合が４．０％を超えると、発光層２Ａの膜強度が低下
し、一寸した振動，衝撃によって剥離して外観特性のみ
ならず、照度特性も損なわれる。又、金属硼酸塩の占め
る割合が０．１％未満になると、発光層２Ａの膜強度が
低下し、一寸した振動，衝撃によって剥離して外観特性
が損なわれる。逆に、その割合が１．０％を超えると、
初期光束が低下するのみならず、水銀と反応して黒褐色
に変色して外観特性が損なわれるし、蛍光体の焼成も難
しくなる。従って、それぞれの混合体に占める割合は上
記範囲内に設定しなければならない。However, if the proportion of α-alumina is less than 0.5%, the starting characteristics in a dark state are impaired, and the starting time varies greatly. Conversely, if the ratio exceeds 4.0%, the film strength of the light emitting layer 2A is reduced, and the light emitting layer 2A is peeled off by a minute vibration or impact, thereby impairing not only the appearance characteristics but also the illuminance characteristics. On the other hand, when the proportion of the metal borate is less than 0.1%, the film strength of the light emitting layer 2A is reduced, and the light emitting layer 2A is peeled off by a slight vibration or impact, thereby deteriorating the appearance characteristics. Conversely, if the ratio exceeds 1.0%,
Not only does the initial luminous flux decrease, but it reacts with mercury and changes color to black-brown, impairing the appearance characteristics, and also makes it difficult to fire the phosphor. Therefore, the proportion of each mixture must be set within the above range.
【００１５】特に、発光層２Ａは電極３，３に近接する
ガラスバルブ１の内面部分にまで形成されているため
に、暗黒状態において、電極間に高周波高電圧を印加し
た際に、α−アルミナから放出されている電子をきっか
けとして２０〜３０ｍＳ程度以下で確実に始動させるこ
とができる。この点、発光層２Ａはガラスバルブ１の内
面のほぼ全長に亘って形成されていることが望ましい。In particular, since the light emitting layer 2A is formed up to the inner surface of the glass bulb 1 close to the electrodes 3, 3, when a high-frequency high voltage is applied between the electrodes in the dark state, α-alumina Can be reliably started at about 20 to 30 mS or less, triggered by electrons emitted from. In this regard, it is desirable that the light emitting layer 2A be formed over substantially the entire length of the inner surface of the glass bulb 1.
【００１６】又、ガラスバルブ１の外径は１．５〜６．
０ｍｍの範囲に収めることが、ＯＡ機器の軽薄短小化の
技術的流れに沿い望ましいものであり、特に、外径が
１．５〜３．０ｍｍの範囲では上述の効果が一層顕著に
現れる傾向にある。The outer diameter of the glass bulb 1 is 1.5-6.
It is desirable to keep the diameter within the range of 0 mm in accordance with the technical trend of lightening and shortening of the OA equipment. In particular, when the outer diameter is within the range of 1.5 to 3.0 mm, the above-described effect tends to be more remarkably exhibited. is there.
【００１７】尚、本発明は、何ら上記実施例に制約され
ることなく、例えば発光層は用途によってはアパ−チャ
部（発光層の未形成部分）を形成することもできる。
又、ガラスバルブの内部空間への水銀の供給は例えば水
銀−チタニウム合金を電極ないしその近傍に付設し、排
気操作の終了後に高周波加熱によって行なうこともでき
る。The present invention is not limited to the above-described embodiment. For example, the light-emitting layer may form an aperture (a part where the light-emitting layer is not formed) depending on the use.
Further, the supply of mercury to the internal space of the glass bulb can be performed by, for example, attaching a mercury-titanium alloy to the electrode or in the vicinity thereof and performing high-frequency heating after completion of the evacuation operation.
【００１８】[0018]
【実施例】次に、実験例について説明する。図１におい
て、外径が３ｍｍ，長さが２３０ｍｍの硼・珪酸ガラス
よりなるガラスバルブの内面に、４５３ｎｍに発光ピ−
クを有するユ−ロピウム付活クロロリン酸ストロンチウ
ム・カルシウム・バリウム・マグネシウム蛍光体（（Ｓ
ｒＣａＢａＭｇ）5 （ＰＯ4 ）3 Ｃｌ：Ｅｕ）と５４４
ｎｍに発光ピ−クを有するセリウム・テルビウム付活リ
ン酸ランタン蛍光体（ＬａＰＯ4 ：Ｃｅ，Ｔｂ）と４５
３ｎｍに発光ピ−クを有するユ−ロピウム付活酸化イッ
トリウム蛍光体（Ｙ2 Ｏ3 ：Ｅｕ）とを重量比でそれぞ
れ４５％，２５％，３０％の割合で混合した１０００ｇ
の混合蛍光体にα−アルミナ，金属硼酸塩を混合してな
る混合体を塗布し、乾燥・焼成して発光層を形成する。
然る後、ガラスバルブの内部空間にネオン（９５％）−
アルゴンの混合希ガスと水銀５ｍｇを封入する。Next, an experimental example will be described. In FIG. 1, an emission peak at 453 nm is formed on the inner surface of a glass bulb made of borosilicate glass having an outer diameter of 3 mm and a length of 230 mm.
Activated strontium / calcium / barium / magnesium phosphor having europium activation ((S
rCaBaMg) 5 (PO 4 ) 3 Cl: Eu) and 544
Cerium-terbium-activated lanthanum phosphate phosphor (LaPO 4 : Ce, Tb) having an emission peak at nm
1000 g of a mixture of europium-activated yttrium oxide phosphor (Y 2 O 3 : Eu) having an emission peak at 3 nm at a weight ratio of 45%, 25% and 30%, respectively.
A mixture of α-alumina and metal borate is applied to the mixed phosphor, and dried and fired to form a light emitting layer.
After that, neon (95%) in the interior space of the glass bulb
A rare gas mixture of argon and 5 mg of mercury are enclosed.
【００１９】この冷陰極蛍光ランプにおいて、α−アル
ミナの混合蛍光体に対する混入割合を重量比で１．０％
に固定し、金属硼酸塩の混入割合を０．０５〜１．２０
％の範囲で変化させて暗黒状態での始動状況，発光層の
膜強度，明るさについて測定したところ、図２に示す結
果が得られた。又、金属硼酸塩の混合蛍光体に対する混
入割合を０．５％に固定し、α−アルミナの混入割合を
０．３〜５．０％の範囲で変化させて暗黒状態での始動
状況，発光層の膜強度，明るさについて測定したとこ
ろ、図３に示す結果が得られた。尚、暗黒状態での始動
状況は、冷陰極蛍光ランプの周囲の照度を０．３Ｌｘに
設定した上で、電極間に５０ＫＨｚ，１０００Ｖの高周
波高電圧を印加し、５００ｍＳ以下で点灯したか否かで
判定し、印は５００ｍＳ以下で点灯したことを、×印は
点灯しなかったことを示している。又、発光層の膜強度
は、冷陰極蛍光ランプを水平状態にして１ｍの高さから
コンクリ−ト面に自由落下させ、発光層の剥離直径が１
ｍｍのものが１個までは良品として判定し、 印は良
品、×印は不良品であることを示している。さらに、明
るさは、α−アルミナ及び金属硼酸塩を混入しないもの
の初期光束に対して９０％以上あるか否かで判定し、
印は９０％以上の初期光束が得られたことを、×印は９
０％未満であることを示している。In this cold cathode fluorescent lamp, the mixing ratio of α-alumina to the mixed phosphor is 1.0% by weight.
And the mixing ratio of the metal borate is 0.05 to 1.20.
%, The starting state in the dark state, the film strength of the light emitting layer, and the brightness were measured. The results shown in FIG. 2 were obtained. In addition, the mixing ratio of the metal borate to the mixed phosphor is fixed to 0.5%, and the mixing ratio of α-alumina is changed in the range of 0.3 to 5.0% to start up in the dark state and emit light. When the film strength and brightness of the layer were measured, the results shown in FIG. 3 were obtained. The starting condition in the dark state is to determine whether the illuminance around the cold cathode fluorescent lamp is set to 0.3 Lx, a high frequency high voltage of 50 KHz and 1000 V is applied between the electrodes, and the lamp is lit at 500 mS or less. The mark indicates that the light was turned on at 500 ms or less, and the mark x indicates that the light was not turned on. Further, the film strength of the light emitting layer is set such that the cold cathode fluorescent lamp is horizontally dropped from a height of 1 m onto a concrete surface, and the peeling diameter of the light emitting layer is 1 mm.
Up to 1 mm is judged as a non-defective product, a mark indicates a non-defective product, and a cross indicates a defective product. Further, the brightness is determined based on whether or not 90% or more of the initial luminous flux is obtained without mixing α-alumina and metal borate,
The mark indicates that 90% or more of the initial luminous flux was obtained.
It shows that it is less than 0%.
【００２０】図２において、金属硼酸塩の混入割合が
０．０５％では発光層の膜強度が弱く実用に供し得ない
ことを、１．２０％では初期光束が低下して好ましくな
いことをそれぞれ示している。従って、金属硼酸塩の混
入割合が０．１０％未満では発光層とガラスバルブとの
間に存在する量が少なくなるために、発光層とガラスバ
ルブとの十分な結着性が得られないものと考えられる。
又、金属硼酸塩の混入割合が１．００％を超えると、発
光層とガラスバルブとの間及び粒子間に存在する量が増
加するために、十分な結着性が得られる反面、紫外線の
吸収が顕著となり初期光束が低下するようになるものと
考えられる。FIG. 2 shows that when the mixing ratio of the metal borate is 0.05%, the film strength of the light emitting layer is so weak that it cannot be put to practical use, and that when the mixing ratio is 1.20%, the initial luminous flux is lowered, which is not preferable. Is shown. Therefore, when the mixing ratio of the metal borate is less than 0.10%, the amount present between the light emitting layer and the glass bulb is small, and thus sufficient binding between the light emitting layer and the glass bulb cannot be obtained. it is conceivable that.
On the other hand, if the mixing ratio of the metal borate exceeds 1.00%, the amount present between the light-emitting layer and the glass bulb and between the particles increases, so that sufficient binding properties can be obtained. It is considered that the absorption becomes remarkable and the initial luminous flux decreases.
【００２１】図３において、α−アルミナの混入割合が
０．３％では暗黒状態での始動が遅く、５．０％では膜
強度が弱く実用面で支障があることを示している。従っ
て、α−アルミナの混入割合が０．５％未満では電子の
放出が不十分となるために、暗黒状態での始動が遅く、
不安定になるものと考えられる。又、α−アルミナの混
入割合が５．０％を超えると、発光層とガラスバルブと
の間及び粒子間に存在する量が不所望に増加するため
に、金属硼酸塩が存在していても結着性が損なわれるも
のと考えられる。FIG. 3 shows that when the mixing ratio of α-alumina is 0.3%, the starting in the dark state is slow, and when the mixing ratio is 5.0%, the film strength is weak and there is a problem in practical use. Therefore, when the mixing ratio of α-alumina is less than 0.5%, the emission of electrons becomes insufficient, so that the starting in the dark state is slow,
It is considered to be unstable. If the mixing ratio of α-alumina exceeds 5.0%, the amount present between the light-emitting layer and the glass bulb and between the particles is undesirably increased. It is considered that the binding property is impaired.
【００２２】[0022]
【発明の効果】以上のように、本発明によれば、発光層
は少なくとも蛍光体とα−アルミナと金属硼酸塩とを含
む混合体にて構成されており、かつα−アルミナ及び金
属硼酸塩の混合体に占める割合が蛍光体重量の０．５〜
４．０％及び０．１〜１．０％の範囲に設定されている
ために、振動，衝撃などが付与されても、発光層がガラ
スバルブの内面からの剥離を効果的に抑制できる。従っ
て、外観特性を改善できる上、初期光束を実用上支障の
ない程度に止めることができるし、軸方向の照度分布を
も改善できる。As described above, according to the present invention, the light emitting layer is composed of a mixture containing at least a phosphor, α-alumina and metal borate, and comprises α-alumina and metal borate. Of the mixture is 0.5 to 0.5% of the phosphor weight.
Since the ratio is set to 4.0% and the range of 0.1 to 1.0%, peeling of the light emitting layer from the inner surface of the glass bulb can be effectively suppressed even when vibration, impact, or the like is applied. Therefore, the appearance characteristics can be improved, the initial luminous flux can be suppressed to a level that does not hinder practical use, and the illuminance distribution in the axial direction can be improved.
【００２３】特に、発光層は電極に近接するガラスバル
ブの内面部分にまで形成されているために、暗黒状態に
おいて、電極間に高周波高電圧を印加した際に、α−ア
ルミナから放出されている電子をきっかけとして実用上
支障のない程度の迅速性をもって確実に始動させること
ができるし、バラツキの少ない安定した始動特性が得ら
れる。In particular, since the light emitting layer is formed up to the inner surface of the glass bulb close to the electrode, it is emitted from α-alumina when a high frequency high voltage is applied between the electrodes in a dark state. It is possible to start the engine reliably with a speed that does not hinder practical use by using the electron as a trigger, and to obtain stable starting characteristics with less variation.
【図１】本発明の１実施例を示す側断面図。FIG. 1 is a side sectional view showing one embodiment of the present invention.
【図２】金属硼酸塩の混入割合に対する各種特性の判定
結果を示す図。FIG. 2 is a graph showing results of determining various characteristics with respect to a mixing ratio of a metal borate.
【図３】α−アルミナの混入割合に対する各種特性の判
定結果を示す図。FIG. 3 is a diagram showing results of determining various characteristics with respect to the mixing ratio of α-alumina.
【図４】従来の冷陰極蛍光ランプの側断面図。FIG. 4 is a side sectional view of a conventional cold cathode fluorescent lamp.
【図５】従来の異なった冷陰極蛍光ランプの側断面図。FIG. 5 is a side sectional view of a different conventional cold cathode fluorescent lamp.
１ ガラスバルブ ２Ａ 発光層 ３ 電極 ４ リ−ド線 DESCRIPTION OF SYMBOLS 1 Glass bulb 2A Light emitting layer 3 Electrode 4 Lead wire
Claims (3)
れぞれの端部に電極を配置すると共に、ガラスバルブの
内部空間に希ガス及び水銀を封入した冷陰極蛍光ランプ
において、前記発光層を蛍光体とα−アルミナと金属硼
酸塩とを含む混合体にて構成し、かつα−アルミナ及び
金属硼酸塩の混合体に占める割合を、蛍光体重量の０．
５〜４．０％及び０．１〜１．０％の範囲に設定したこ
とを特徴とする冷陰極蛍光ランプ。1. A cold-cathode fluorescent lamp in which an electrode is arranged at each end of a glass bulb having a light-emitting layer on an inner surface, and a rare gas and mercury are sealed in an inner space of the glass bulb. And a ratio of the mixture of α-alumina and metal borate to 0.1% of the phosphor weight.
A cold cathode fluorescent lamp characterized by being set in the range of 5 to 4.0% and 0.1 to 1.0%.
全長に亘って形成したことを特徴とする請求項１記載の
冷陰極蛍光ランプ。2. The cold cathode fluorescent lamp according to claim 1, wherein said light emitting layer is formed over substantially the entire length of the inner surface of the glass bulb.
０ｍｍに設定したことを特徴とする請求項１記載の冷陰
極蛍光ランプ。3. The glass bulb has an outer diameter of 1.5-6.
2. The cold cathode fluorescent lamp according to claim 1, wherein the distance is set to 0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23215596A JPH1074484A (en) | 1996-09-02 | 1996-09-02 | Cold cathode fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23215596A JPH1074484A (en) | 1996-09-02 | 1996-09-02 | Cold cathode fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1074484A true JPH1074484A (en) | 1998-03-17 |
Family
ID=16934864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23215596A Pending JPH1074484A (en) | 1996-09-02 | 1996-09-02 | Cold cathode fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1074484A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007034414A3 (en) * | 2005-09-26 | 2007-07-26 | Koninkl Philips Electronics Nv | Low-mercury-consuming fluorescent lamps with phosphor/alumina-containing layer |
-
1996
- 1996-09-02 JP JP23215596A patent/JPH1074484A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007034414A3 (en) * | 2005-09-26 | 2007-07-26 | Koninkl Philips Electronics Nv | Low-mercury-consuming fluorescent lamps with phosphor/alumina-containing layer |
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