JPH07240179A - Flat fluorescent tube - Google Patents
Flat fluorescent tubeInfo
- Publication number
- JPH07240179A JPH07240179A JP2773794A JP2773794A JPH07240179A JP H07240179 A JPH07240179 A JP H07240179A JP 2773794 A JP2773794 A JP 2773794A JP 2773794 A JP2773794 A JP 2773794A JP H07240179 A JPH07240179 A JP H07240179A
- Authority
- JP
- Japan
- Prior art keywords
- discharge
- discharge path
- meandering
- width
- fluorescent tube
- 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- Withdrawn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
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- Discharge Lamps And Accessories Thereof (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、液晶ディスプレイパネ
ルのバックライトなどに使用される平面型蛍光管に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat fluorescent tube used as a backlight of a liquid crystal display panel.
【0002】[0002]
【従来の技術】液晶ディスプレイパネルのバックライト
として、帯状の放電路を蛇行させるなどして面発光させ
るようにした平面型蛍光管が賞用されている。この平面
型蛍光管は、衝合させた二枚のガラス板の間に放電幅1
0mm以下程度の細長い帯状の放電路を形成したもの
や、帯状の放電路を管径10mm以下の細管状の蛍光ラ
ンプで形成したものがあり、その一般的従来例を図7乃
至図9を参照して説明する。2. Description of the Related Art As a backlight of a liquid crystal display panel, a flat fluorescent tube, which has a strip-shaped discharge path meandering to emit surface light, has been favored. This flat fluorescent tube has a discharge width of 1 between two abutted glass plates.
There are a long strip-shaped discharge path of about 0 mm or less formed, and a strip-shaped discharge path formed of a thin tube fluorescent lamp with a tube diameter of 10 mm or less. Typical general examples thereof are shown in FIGS. 7 to 9. And explain.
【0003】同図に示される平面型蛍光管は、矩形平板
状の表面ガラス板15と矩形波形の裏面ガラス板16を
気密に重ね合わせ、裏面ガラス板16の表面ガラス板1
5との衝合面に絞り加工などで蛇行状に形成した凹部1
7と表面ガラス板15とで蛇行状の放電路18を形成し
ている。凹部17は、例えばW字状に蛇行し、その内面
に図示しない蛍光体被膜が形成される。W字状放電路1
8の両端部18aと中央の蛇行放電部18bにそれぞれ
電極19,20が配置される。電極19は、冷陰極又は
熱陰極型電極で、各々からリード21がガラス板15,
16の外部に導出される。放電路18内は、真空状態で
加熱脱ガス後にアルゴンなどの不活性ガスと水銀が封入
される。In the flat fluorescent tube shown in the figure, a front glass plate 15 in the form of a rectangular flat plate and a back glass plate 16 in a rectangular corrugation are airtightly overlapped with each other to form a front glass plate 1 of the back glass plate 16.
A concave portion 1 formed in a meandering shape by drawing on the abutting surface with 5
7 and the surface glass plate 15 form a meandering discharge path 18. The recess 17 meanders in a W shape, for example, and a phosphor coating (not shown) is formed on the inner surface thereof. W-shaped discharge path 1
Electrodes 19 and 20 are arranged on both end portions 18a of 8 and the meandering discharge portion 18b at the center, respectively. The electrodes 19 are cold cathode or hot cathode type electrodes, and the leads 21 are connected to the glass plate 15,
16 is derived outside. The discharge path 18 is filled with an inert gas such as argon and mercury after being heated and degassed in a vacuum state.
【0004】放電路18の両端の電極19を同極、中央
の電極20を異極として両端電極19と中央電極20の
間に所定の電圧を印加すると、放電路18を二分したU
字状の第1放電路18mと第2放電路18nでそれぞれ
にグロー放電が発生して、各放電路18m,18nの蛍
光体被膜が発光する。各放電路18m,18nの光は表
面ガラス板15上で面発光して、表面ガラス板15の上
方に配置された図示しない液晶ディスプレイパネルを照
明する。When the electrodes 19 at both ends of the discharge path 18 have the same polarity and the central electrode 20 has a different polarity and a predetermined voltage is applied between the electrodes 19 at both ends and the central electrode 20, the discharge path 18 is divided into two parts.
Glow discharge is generated in each of the letter-shaped first discharge path 18m and second discharge path 18n, and the phosphor coating of each discharge path 18m, 18n emits light. The light from each of the discharge paths 18m and 18n is surface-emitted on the surface glass plate 15 and illuminates a liquid crystal display panel (not shown) arranged above the surface glass plate 15.
【0005】このような平面型蛍光管は、W字状の放電
路18の中央の蛇行放電部18bに電極20を配置する
ことにより、放電路18を第1放電路18mと第2放電
路18nの2つに分け、各放電路18m,18nの電極
間のアーク長を短くすることで、放電開始電圧をより低
くし、消費電力が少なくなるようにしている。また、放
電路18を矩形断面にすることで、上下ガラス板15,
16の全体の厚さを小さくして、全体を10mm以下と
薄型化している。In such a flat fluorescent tube, an electrode 20 is arranged in the meandering discharge part 18b at the center of the W-shaped discharge path 18 so that the discharge path 18 is formed into a first discharge path 18m and a second discharge path 18n. The discharge start voltage is further lowered and the power consumption is reduced by shortening the arc length between the electrodes of the discharge paths 18m and 18n. Further, by making the discharge path 18 a rectangular cross section, the upper and lower glass plates 15,
The thickness of 16 as a whole is reduced to a thickness of 10 mm or less.
【0006】[0006]
【発明が解決しようとする課題】ところで、上記のよう
な平面型蛍光管は、通常の蛍光ランプと同様に点灯時間
が長くなると、放電路18の電極近傍の内壁面、つま
り、両端部18aと中央の蛇行放電部18bの内壁面が
電極スパッタリングにて黒化し、輝度が極端に低下する
〔黒化部を斜線で示した〕。そのため、放電路18の黒
化現象が生じる両端部18aと中央の蛇行放電部18b
の在る領域上は、液晶ディスプレイパネルのバックライ
ト領域として使用できないデッドスペースとなる。実
際、表面ガラス板15の電極配置側の端から放電路18
の両端部18aの黒化現象が生じる所定の長さまでの端
部がデッドスペース部D’として設定され、表面ガラス
板15上のデッドスペース部D’を除く部分が液晶ディ
スプレイパネルのバックライトとして有効な有効発光部
S’として使用される。By the way, in the flat fluorescent tube as described above, when the lighting time becomes long as in a normal fluorescent lamp, the inner wall surface near the electrodes of the discharge path 18, that is, both end portions 18a. The inner wall surface of the meandering discharge part 18b in the center is blackened by electrode sputtering, and the brightness is extremely lowered [the blackened part is shown by diagonal lines]. Therefore, both ends 18a where the blackening phenomenon of the discharge path 18 occurs and the meandering discharge part 18b in the center are formed.
A dead space that cannot be used as the backlight area of the liquid crystal display panel is provided on the area where the area exists. In fact, from the end of the surface glass plate 15 on the electrode arrangement side, the discharge path 18
The end portions up to a predetermined length where the blackening phenomenon of the both end portions 18a is set as the dead space portion D ', and the portion excluding the dead space portion D'on the front glass plate 15 is effective as the backlight of the liquid crystal display panel. It is used as an effective light emitting portion S '.
【0007】かかる平面型蛍光管における放電路18の
端部18aでの黒化現象は点灯条件に左右されるが、例
えば入力電力が数ワット、点灯時間10000時間程度
の場合、放電方向に5〜8mm程度の長さで生じるた
め、表面ガラス板15の端部におけるデッドスペース部
D’の幅は実質上20mm以上必要としていた。このよ
うなデッドスペース部D’の幅は、表面ガラス板15上
の有効発光部S’の面積の大小に関係無く決まり、平面
型蛍光管が小形になるほど表面ガラス15上でのデッド
スペース部D’の面積比率が高くなり、平面型蛍光管の
実質上の小形化を難しくしていた。The blackening phenomenon at the end portion 18a of the discharge path 18 in such a flat type fluorescent tube depends on the lighting conditions. For example, when the input power is several watts and the lighting time is about 10,000 hours, 5 to 5 in the discharge direction. Since it occurs with a length of about 8 mm, the width of the dead space portion D ′ at the end of the front surface glass plate 15 needs to be substantially 20 mm or more. The width of such a dead space portion D ′ is determined regardless of the size of the effective light emitting portion S ′ on the surface glass plate 15, and the smaller the flat fluorescent tube becomes, the more the dead space portion D on the surface glass 15 becomes. The area ratio of the 'has become high, and it has been difficult to downsize the flat fluorescent tube substantially.
【0008】表面ガラス15上でのデッドスペースを小
さくして、有効発光面積を大きくする工夫として、電極
19の放電方向での長さを短くし、短くした分だけデッ
ドスペース部D’の幅を小さくすることが一部で行われ
ている。しかし、電極19の小形化によるデッドスペー
スの幅縮小化の実質上の効果はほどんど無く、かえって
電極寿命が短くなって蛍光管が短寿命となる問題があ
る。In order to reduce the dead space on the surface glass 15 and increase the effective light emitting area, the length of the electrode 19 in the discharge direction is shortened, and the width of the dead space portion D'is reduced by the shortened length. Some things are being made smaller. However, there is almost no practical effect of reducing the width of the dead space due to the miniaturization of the electrode 19, and there is a problem that the life of the electrode is shortened and the life of the fluorescent tube is shortened.
【0009】また、有効発光部S’における放電路18
は、U字状の第1放電路18mと第2放電路18nで、
この各放電路18m,18nのU字状に蛇行する蛇行放
電部18dがほぼ半円形であり、各放電路18m,18
nの4条の平行な直線放電部18c,…の間隔を同一に
して、各放電路18m,18nを同一輝度で発光させて
いる。そのため、各放電路18m,18nの中間位置に
相当する有効発光部S’の中央点Q1 が最も明るくな
り、各放電路18m,18nの半円形蛇行放電部18c
から離れた矩形有効発光部S’の一辺の両端の角近傍点
Q2 と一辺の中央近傍点Q3 の3点の部分が目立って暗
くなり、有効発光部S’の全体の輝度分布である均斉度
が悪くなる問題もあった。Further, the discharge path 18 in the effective light emitting portion S '
Is a U-shaped first discharge path 18m and a second discharge path 18n,
The meandering discharge part 18d meandering in a U-shape of each of the discharge paths 18m and 18n has a substantially semicircular shape.
The four parallel linear discharge parts 18c, ... Of n have the same interval, and the discharge paths 18m and 18n are caused to emit light with the same brightness. Therefore, the central point Q 1 of the effective light emitting portion S ′ corresponding to the intermediate position between the discharge paths 18m and 18n becomes the brightest, and the semi-circular meandering discharge portion 18c of the discharge paths 18m and 18n becomes brighter.
A rectangular effective light-emitting portion S ', which is distant from the corner, has three points, that is, a corner neighboring point Q 2 at both ends of one side and a center neighboring point Q 3 on one side, which is noticeably darkened, and is the entire luminance distribution of the effective light-emitting portion S'. There was also a problem that the uniformity was poor.
【0010】本発明の目的とするところは、面発光する
表面でのデッドスペースを最小限にして、表面全体での
有効発光面の面積比率を上げると共に、輝度分布の均斉
度を向上させた、長寿命で小形化の容易な平面型蛍光管
を提供することにある。The object of the present invention is to minimize the dead space on the surface emitting light, increase the area ratio of the effective light emitting surface on the entire surface, and improve the uniformity of the luminance distribution. An object is to provide a flat fluorescent tube that has a long life and is easy to miniaturize.
【0011】[0011]
【課題を解決するための手段】本発明は、両端に電極を
有する帯状の放電路の端部を、放電路内の放電方向と略
直交方向に屈曲させ、この端部の屈曲点から所定距離の
奥部分に電極を配置したことにより、上記目的を達成す
るものである。According to the present invention, an end portion of a strip-shaped discharge path having electrodes at both ends is bent in a direction substantially orthogonal to a discharge direction in the discharge path, and a predetermined distance is provided from a bending point of the end portion. By arranging the electrodes in the inner part of the, the above-mentioned object is achieved.
【0012】前記放電路は、密着させて重ね合わせた二
枚のガラス板の間に形成されたもの、又は、細管状の蛍
光ランプで形成されたものが適用される。As the discharge path, a discharge tube formed between two glass plates closely adhered to each other or a thin tube fluorescent lamp is used.
【0013】また、前記放電路を蛇行状に形成した場
合、蛇行状放電路の両端部と、この両端部間の約180
゜蛇行させた蛇行放電部を一直線上に並べ、この両端部
と蛇行放電部に電極を配置して、蛇行状放電路を各電極
間の複数の放電路に分割することが実用上望ましい。When the discharge path is formed in a meandering shape, both ends of the meandering discharge path and about 180 between the both ends are formed.
It is practically desirable to divide the meandering discharge path into a plurality of discharge paths between the electrodes by arranging the meandering discharge parts that are meandering in a straight line and arranging electrodes on both ends and the meandering discharge part.
【0014】また、矩形の平面に放電路をW字状に蛇行
させて形成した場合、W字状放電路の4条の略直線状の
直線放電部の幅を、隣接する各直線放電部を連通する蛇
行放電部の幅より大きくし、4条の直線放電部の中央部
分を順に小、大、小の異なる2段階の間隔で隣接させ、
W字状放電路の中央の蛇行放電部を除く2つの隣接する
蛇行放電部が矩形平面の一辺に平行で、この各蛇行放電
部の内側端部が矩形平面の一辺の中央近傍に張り出し、
各蛇行放電部の外側端部が矩形平面の一辺の両端の角近
傍まで張り出しているようにすることが、矩形の有効発
光面の均斉度をより良好にする上で望ましい。When the discharge path is formed to meander in a W shape on a rectangular flat surface, the width of the four substantially linear linear discharge portions of the W-shaped discharge path is set to the width of each adjacent linear discharge portion. The width is larger than the width of the meandering discharge part that communicates with each other, and the central portions of the four linear discharge parts are adjacent to each other at two different intervals, small, large, and small.
Except for the meandering discharge part at the center of the W-shaped discharge path, two adjacent meandering discharge parts are parallel to one side of the rectangular plane, and the inner end of each of the meandering discharge parts overhangs near the center of one side of the rectangular plane.
It is desirable that the outer ends of the meandering discharge parts project to near the corners of both ends of one side of the rectangular plane in order to improve the uniformity of the rectangular effective light emitting surface.
【0015】[0015]
【作用】両端に電極を有する帯状の放電路の両端部を放
電方向と直交方向に屈曲させて、この屈曲端部に電極を
配置すると、電極スパッタリングで電極近傍の放電路内
壁面が黒化しても、この黒化した部分は放電路の屈曲し
た端部だけに生じる。したがって、放電路の屈曲した端
部を除く部分を有効発光部に設定することができ、この
場合、有効発光部から食み出すデッドスペースの幅は、
放電路のL形に折曲された端部の幅に相当して、デッド
スペースの幅、面積が小さくなる。[Function] When both ends of a strip-shaped discharge path having electrodes at both ends are bent in a direction orthogonal to the discharge direction and the electrodes are arranged at the bent ends, the inner wall surface of the discharge path near the electrodes is blackened by electrode sputtering. However, this blackened portion occurs only at the bent end of the discharge path. Therefore, a portion of the discharge path excluding the bent end can be set as the effective light emitting portion. In this case, the width of the dead space protruding from the effective light emitting portion is
The width and area of the dead space are reduced corresponding to the width of the L-shaped end of the discharge path.
【0016】また、矩形平面で放電路をW字状に蛇行さ
せ、この放電路の直線放電部の幅を蛇行放電部の幅より
大きくすると、矩形平面の中央部の輝度が下がり、蛇行
放電部を矩形平面の角近傍に張り出すように形成する
と、矩形平面の角近傍の輝度が上がり、全体として矩形
平面の有効発光面の輝度分布がより均一となり、均斉度
が良くなる。If the discharge path is meandered in a W shape in a rectangular plane and the width of the linear discharge part of this discharge path is made larger than the width of the meandering discharge part, the brightness of the central part of the rectangular plane is lowered and the meandering discharge part is formed. Is formed so as to project in the vicinity of the corner of the rectangular plane, the brightness in the vicinity of the corner of the rectangular plane is increased, and the brightness distribution of the effective light emitting surface of the rectangular plane becomes more uniform as a whole and the uniformity is improved.
【0017】[0017]
【実施例】以下、実施例について図1乃至図6を参照し
て説明する。EXAMPLES Examples will be described below with reference to FIGS. 1 to 6.
【0018】図1乃至図3に示される実施例の平面型蛍
光管は、図7の平面型蛍光管と同一タイプのもので、気
密に重ね合わせて接合一体化した矩形平板状の表面ガラ
ス板4と矩形波板状の裏面ガラス板5の間に略W字状に
蛇行する帯状の放電路1を形成している。裏面ガラス板
5の衝合面に絞り加工などで略W字状に形成した凹部6
と表面ガラス板4とで放電路1が形成され、凹部6又は
放電路1の内面に蛍光体被膜が形成される。The flat type fluorescent tube of the embodiment shown in FIGS. 1 to 3 is of the same type as the flat type fluorescent tube of FIG. 7, and is a rectangular flat plate-shaped surface glass plate which is airtightly superposed and joined integrally. A strip-shaped discharge path 1 meandering in a substantially W-shape is formed between the rear surface glass plate 4 and the rectangular corrugated back glass plate 5. A recess 6 formed in a substantially W shape on the abutting surface of the back glass plate 5 by drawing.
And the surface glass plate 4 form the discharge path 1, and the phosphor coating is formed on the recess 6 or the inner surface of the discharge path 1.
【0019】上記実施例においては、放電路1の両端部
1aを放電方向と直交方向内側に屈曲させて、この両端
部1aの奥部分に電極2を配置したことを特徴とする。
更に、上記実施例においては、放電路1の中央の蛇行放
電部1bを両端部1aと一直線上に形成して、この蛇行
放電部1bの中央に電極3を配置したことを特徴とす
る。なお、各電極2、3は、冷陰極又は熱陰極型電極で
あり、各々からリード7がガラス板4,5の外部に導出
され、放電路1内は加熱脱ガス処理後にアルゴンなどの
不活性ガスと水銀が封入される。The above embodiment is characterized in that both ends 1a of the discharge path 1 are bent inward in the direction orthogonal to the discharge direction, and the electrodes 2 are arranged at the inner portions of the both ends 1a.
Further, the above embodiment is characterized in that the meandering discharge part 1b at the center of the discharge path 1 is formed in line with both end parts 1a, and the electrode 3 is arranged at the center of the meandering discharge part 1b. Each of the electrodes 2 and 3 is a cold cathode or hot cathode type electrode, the lead 7 is led out from each of them to the outside of the glass plates 4 and 5, and the inside of the discharge path 1 is inert such as argon after the heat degassing process. Gas and mercury are enclosed.
【0020】放電路1の両端部1aの電極2を同極、中
央の電極3を異極として両端電極2と中央電極3の間に
所定の電圧を印加すると、放電路1を二分したU字状の
第1放電路1mと第2放電路1nでそれぞれにグロー放
電又はアーク放電が発生して、各放電路1m,1nの蛍
光体被膜が発光し、この光が表面ガラス板4上で面発光
する。When a predetermined voltage is applied between the end electrodes 2 and the central electrode 3 with the electrodes 2 at both ends 1a of the discharge path 1 having the same polarity and the central electrode 3 having different polarities, the discharge path 1 is divided into two U-shapes. A glow discharge or an arc discharge is generated in each of the first discharge path 1m and the second discharge path 1n, and the phosphor coating of each discharge path 1m, 1n emits light. It emits light.
【0021】W字状放電路1を点灯させたとき、両端部
1aと中央蛇行放電部1bの内壁面が電極スパッタリン
グで黒化する〔黒化部を斜線で示す〕。この黒化現象
は、放電方向に5〜8mm程度の長さで生じる。そこ
で、放電路1の両端部1aの屈曲点から電極2までの長
さと、中央の蛇行放電部1bを直線状にして、その中央
の電極3から蛇行放電部1bの両端の屈曲点までの長さ
を黒化現象が生じる長さ程度にする。このようにする
と、W字状放電路1の黒化現象が生じてデッドスペース
となる部所は、一直線上に並ぶ両端部1aと中央蛇行放
電部1bだけとなり、この場合のデッドスペース部Dの
幅は放電路1の両端部1aの幅W1 程度になる。When the W-shaped discharge path 1 is turned on, the inner wall surfaces of both end portions 1a and the central meandering discharge portion 1b are blackened by electrode sputtering [blackened portions are shown by diagonal lines]. This blackening phenomenon occurs in a length of about 5 to 8 mm in the discharge direction. Therefore, the length from the bending point of both ends 1a of the discharge path 1 to the electrode 2 and the length from the center electrode 3 to the bending point of both ends of the meandering discharge portion 1b are made linear. The length is set to about the length at which the blackening phenomenon occurs. In this case, the W-shaped discharge path 1 is blackened and the dead space is the only end portions 1a and the central meandering discharge portion 1b aligned in a straight line. The width is about the width W 1 of both ends 1a of the discharge path 1.
【0022】例えば小形の平面型蛍光管における帯状の
放電路1の平均幅を5mm程度に設定した場合、表面ガ
ラス板4上でのデッドスペース部Dの幅は8mm程度と
縮小される。したがって、図1の平面型蛍光管の有効発
光部Sと図7の平面型蛍光管の有効発光部S’が同一サ
イズ、面積であるとすると、図1の平面型蛍光管の方が
デッドスペース部Dの幅縮小分だけ図7の平面型蛍光管
より小形化される。また、図1の平面型蛍光管と図7の
平面型蛍光管の外径サイズが同一とすると、図1の平面
型蛍光管の有効発光部Sの面積がデッドスペース部Dの
幅縮小分だけ図7の平面型蛍光管の有効発光面積より大
きくなる。For example, when the average width of the strip-shaped discharge path 1 in a small flat fluorescent tube is set to about 5 mm, the width of the dead space portion D on the surface glass plate 4 is reduced to about 8 mm. Therefore, assuming that the effective light emitting portion S of the flat fluorescent tube of FIG. 1 and the effective light emitting portion S ′ of the flat fluorescent tube of FIG. 7 have the same size and area, the dead space of the flat fluorescent tube of FIG. The size of the flat fluorescent tube of FIG. 7 is reduced by the width reduction of the portion D. Further, if the flat fluorescent tube of FIG. 1 and the flat fluorescent tube of FIG. 7 have the same outer diameter size, the area of the effective light emitting portion S of the flat fluorescent tube of FIG. 1 is equal to the width reduction of the dead space portion D. This is larger than the effective light emitting area of the flat fluorescent tube of FIG.
【0023】次に、上記実施例の具体的構造例、他の実
施例を説明する。Next, a specific structural example of the above embodiment and other embodiments will be described.
【0024】二枚のガラス板4,5を重ねて形成された
放電路1は略矩形断面であり、このような断面の放電路
1に配置される電極2,3は、図4(a)(b)や図5
(a)(b)に示すような扁平型のホローカソード型電
極が、長寿命で始動特性に優れることで望ましい。The discharge path 1 formed by stacking two glass plates 4 and 5 has a substantially rectangular cross section, and the electrodes 2 and 3 arranged in the discharge path 1 having such a cross section are shown in FIG. (B) and FIG.
Flat hollow cathode electrodes as shown in (a) and (b) are desirable because they have a long life and excellent starting characteristics.
【0025】図4(a)(b)は、放電路1の両端部1
aに配置される電極2が示され、これは一端開口他端閉
塞の扁平なキャップ状のニッケル製ホローカソード8の
中にセリウム−タングステンのフィラメント9を収納し
ている。放電路1の端部1aの奥にホローカソード8の
開口を放電路1の放電方向に向けて配置することで、放
電時の電極周囲への電子の回り込みが少なくなって、良
好な放電特性が得られる。また、ホローカソード8によ
って内部のフィラメント9が保温され、低消費電力での
放電が可能になる。4A and 4B show both ends 1 of the discharge path 1.
There is shown an electrode 2 arranged at a, which contains a cerium-tungsten filament 9 in a flat cap nickel hollow cathode 8 with one end open and the other end closed. By arranging the opening of the hollow cathode 8 toward the discharge direction of the discharge path 1 at the back of the end 1a of the discharge path 1, electrons are less sneak around the electrode at the time of discharge, and good discharge characteristics are obtained. can get. In addition, the hollow cathode 8 keeps the internal filament 9 warm, and discharge with low power consumption becomes possible.
【0026】図5(a)(b)は、放電路1の中央の蛇
行放電部1bに配置される電極3(で、両端開口中央閉
塞の扁平なキャップ状のニッケル製ホローカソード10
の両端部開口内にそれぞれにセリウム−タングステンの
フィラメント11を収納している。放電路1の蛇行放電
端部1bの中央にホローカソード10の両端の開口を放
電路1の放電方向に向けて配置する。この電極3のホロ
ーカソード10は、第1放電路1mと第2放電路1nの
両方の放電に共用されて、他の電極2の2倍の電圧を受
けることから、幅方向のサイズを大きくしておく。この
幅広に拡大された電極3に対応して、図1に示されるよ
うに、蛇行放電部1bの中央部の幅を少し拡大し、この
幅広中央部に電極3を配置する。このような蛇行放電部
1bの中央部の幅拡大化は、前述したデッドスペースの
幅縮小化により問題無く実行可能である。5 (a) and 5 (b) show a flat cap-shaped nickel hollow cathode 10 (with both ends open and closed at the center) of the electrode 3 (disposed at the meandering discharge portion 1b at the center of the discharge path 1).
A cerium-tungsten filament 11 is housed in each of the openings at both ends. At the center of the meandering discharge end 1b of the discharge path 1, openings at both ends of the hollow cathode 10 are arranged in the discharge direction of the discharge path 1. The hollow cathode 10 of the electrode 3 is shared by both the discharges of the first discharge path 1m and the second discharge path 1n and receives twice the voltage of the other electrodes 2, so that the size in the width direction is increased. Keep it. Corresponding to the widened electrode 3, as shown in FIG. 1, the width of the central portion of the meandering discharge portion 1b is slightly enlarged, and the electrode 3 is arranged in the wide central portion. The expansion of the width of the central portion of the meandering discharge part 1b can be executed without any problem by reducing the width of the dead space described above.
【0027】図1の平面型蛍光管の有効発光部Sの輝度
分布は、W字状放電路1の幅、間隔を次のようにするこ
とで、より均一となって均斉度が向上する。The luminance distribution of the effective light emitting portion S of the flat fluorescent tube of FIG. 1 becomes more uniform and the uniformity is improved by setting the width and spacing of the W-shaped discharge path 1 as follows.
【0028】即ち、矩形の表面ガラス4の有効発光部S
下で蛇行する放電路1は、略平行に並ぶ略直線状の4条
の直線放電部1cと、左右一対の蛇行放電部1dで構成
される。ここで有効発光部Sでの4条の直線放電部1c
の両端部分を除く中央部分の幅W2 を左右の蛇行放電部
1bの幅W3 より大きく設定すると共に、内側2条の直
線放電部1cの間隔P1 を、内側2条の直線放電部1c
とその隣りの外側2条の直線放電部1cとの間隔P2 よ
りも大きく設定する。このような幅と間隔設定で、矩形
有効発光部Sの中央部(従来、明るくなり過ぎていた部
分)の明るさが少し低下し、矩形有効発光部Sの中央部
の幅方向の輝度分布が均一化する。That is, the effective light emitting portion S of the rectangular surface glass 4
The downwardly meandering discharge path 1 is composed of four linear straight line discharge portions 1c arranged substantially in parallel and a pair of left and right meandering discharge portions 1d. Here, the four linear discharge portions 1c in the effective light emitting portion S
The width W 2 of the central portion excluding both end portions is set larger than the width W 3 of the left and right meandering discharge portions 1b, and the interval P 1 between the two inner linear discharge portions 1c is set to the inner two linear discharge portions 1c.
It is set to be larger than the interval P 2 between the two adjacent linear discharge parts 1c on the outside. With such a width and interval setting, the brightness of the central portion of the rectangular effective light emitting portion S (the portion that has been too bright in the past) is slightly reduced, and the luminance distribution in the width direction of the central portion of the rectangular effective light emitting portion S is reduced. Homogenize.
【0029】また、有効発光部Sの放電路1における左
右の幅狭な蛇行放電部1dを放電方向で直線状にして、
矩形表面ガラス4の一辺と平行に沿わせると共に、蛇行
放電部1dの片端側を表面ガラス4の一辺の角部4''ま
で張り出すように蛇行させ、かつ、蛇行放電部1dの他
端側を表面ガラス4の一辺の中央部4’まで張り出すよ
うに蛇行させる。このようにすると、幅狭となって輝度
が上がった蛇行放電部1dが矩形の有効発光部Sの片端
部の角部4''と中央部4’の3点部分(従来暗くなって
いた部分)の輝度が上がる。この有効発光部Sにおける
端部の輝度アップと中央の輝度ダウンで、有効発光部S
の全体の輝度の均一化が可能となる。Further, the narrow meandering discharge portion 1d on the left and right in the discharge path 1 of the effective light emitting portion S is made linear in the discharge direction,
Along the one side of the rectangular surface glass 4, the one side of the meandering discharge part 1d is meandered so as to extend to a corner 4 '' of one side of the surface glass 4, and the other end side of the meandering discharge part 1d. Is made to meander so as to project to the central portion 4'of one side of the surface glass 4. By doing so, the meandering discharge portion 1d having a narrower width and increased brightness has three points of the corner portion 4 ″ and the central portion 4 ′ of one end portion of the rectangular effective light emitting portion S (the portion which is conventionally dark). ) Brightness increases. By increasing the brightness of the end portion and decreasing the brightness of the central portion of the effective light emitting portion S, the effective light emitting portion S
It is possible to make the brightness of the entire display uniform.
【0030】なお、放電路1の蛇行放電部1dの両端側
を矩形有効発光部Sの一辺の角近傍と中央近傍まで鋭角
的に張り出すようにしてもよいが、図1に示すように、
蛇行放電部1dの両端側を少し湾曲させて蛇行させるよ
うにすることが、この部分でのアーク長を短くして放電
開始電圧を低くし、放電駆動回路の負担を少なくする上
で望ましい。It should be noted that both ends of the meandering discharge part 1d of the discharge path 1 may be projected to the vicinity of the corner of one side of the rectangular effective light emitting part S and the vicinity of the center thereof at an acute angle, but as shown in FIG.
It is desirable to slightly bend both ends of the meandering discharge portion 1d so that the meandering discharge portion 1d is meandered in order to shorten the arc length at this portion, lower the discharge start voltage, and reduce the load on the discharge drive circuit.
【0031】また、図1に示される平面型蛍光管の放電
路1の蛇行形状はW字状に限らず、蛇行形状以外であっ
てもよい。更に、放電路1は二枚のガラス板4,5の間
に形成したものに限らず、直管や曲管の蛍光ランプで形
成されたものであってもよく、その実施例が図6に示め
される。Further, the meandering shape of the discharge path 1 of the flat fluorescent tube shown in FIG. 1 is not limited to the W shape, but may be other than the meandering shape. Further, the discharge path 1 is not limited to the one formed between the two glass plates 4 and 5, and may be a straight tube or a curved tube fluorescent lamp. To be shown.
【0032】図6は、1本のU字形蛍光ランプ12でU
字形放電路を形成した平面型蛍光管である。U字形蛍光
ランプの両端部12aをそれぞれ内側に直角に屈曲させ
て、両端部12aの奥部分に電極13を配置する。この
場合、蛍光ランプ12を図示しない反射板と拡散板で挟
むなどして、平面型蛍光管が構成される。また、図6の
平面型蛍光管においては、蛍光ランプ12の屈曲された
両端部12aの在る領域がデッドスペース部Dとなり、
両端部12a以外のU字状放電部分が有効発光部Sとし
て使用される。この場合もデッドスペース部Dの幅が、
蛍光ランプ12の管径程度に縮小される。FIG. 6 shows a single U-shaped fluorescent lamp 12 which is U-shaped.
It is a flat fluorescent tube having a V-shaped discharge path. Both ends 12a of the U-shaped fluorescent lamp are bent inwardly at right angles, and the electrodes 13 are arranged at the inner portions of the both ends 12a. In this case, the fluorescent lamp 12 is sandwiched between a reflection plate and a diffusion plate (not shown) to form a flat fluorescent tube. In the flat fluorescent tube of FIG. 6, the dead space portion D is the area where the bent ends 12a of the fluorescent lamp 12 are present.
The U-shaped discharge portion other than the both end portions 12a is used as the effective light emitting portion S. In this case as well, the width of the dead space portion D is
The size is reduced to about the tube diameter of the fluorescent lamp 12.
【0033】[0033]
【発明の効果】本発明によれば、両端に電極を有する帯
状の放電路の端部を放電方向と直交方向に屈曲させたの
で、放電路を長時間点灯させて電極スパッタリングで電
極近傍の放電路内壁面が黒化しても、この黒化する部分
は放電路の屈曲した端部だけとなり、したがって、放電
路の屈曲した端部を除く部分を有効発光部に設定したと
きの有効発光部から食み出すデッドスペースの幅は、放
電路の折曲された端部の幅程度に縮小される。その結
果、平面型蛍光管の発光面全体に占めるデッドスペース
の面積の割合が小さくなり、逆に有効発光面の割合が大
きくなって、所定の面積の有効発光面を持つ平面型蛍光
管の小形コンパクト化や、所定サイズの平面型蛍光管の
有効発光面の面積拡大化が可能となる。According to the present invention, since the end portion of the strip-shaped discharge path having the electrodes at both ends is bent in the direction orthogonal to the discharge direction, the discharge path is lit for a long time and the discharge in the vicinity of the electrode is performed by electrode sputtering. Even if the inner wall surface is blackened, this blackened part is only the bent end of the discharge path.Therefore, from the effective light emitting part when the part excluding the bent end of the discharge path is set as the effective light emitting part. The width of the protruding dead space is reduced to about the width of the bent end of the discharge path. As a result, the proportion of the dead space area occupying the entire light emitting surface of the flat fluorescent tube becomes small, and the proportion of the effective light emitting surface becomes large on the contrary, resulting in a small flat fluorescent tube having an effective light emitting surface of a predetermined area. It is possible to make the device compact and increase the area of the effective light emitting surface of the flat fluorescent tube of a predetermined size.
【0034】また、矩形平面で放電路をW字状に蛇行さ
せ、この放電路の直線放電部の幅を蛇行放電部の幅より
大きくし、幅狭の蛇行放電部を矩形有効発光面の角近傍
に張り出すようにすると、矩形平面の有効発光面の中央
部の輝度が下がり、反対に矩形有効発光面の角近傍の輝
度が上がって、有効発光面全体の輝度分布がより均一と
なり、均斉度が良くなって、実用価値の高い平面型蛍光
管が提供できる。Further, the discharge path is meandered in a W shape in a rectangular plane, the width of the linear discharge part of this discharge path is made larger than the width of the meandering discharge part, and the narrow meandering discharge part is made into a corner of the rectangular effective light emitting surface. If it is projected in the vicinity, the brightness of the central part of the rectangular effective light emitting surface decreases, and on the contrary, the brightness near the corners of the rectangular effective light emitting surface increases, making the brightness distribution of the entire effective light emitting surface more uniform and uniform. It is possible to provide a flat fluorescent tube of high practical value with a high degree of practicality.
【図1】本発明の一実施例を示す一部省略部分を含む平
面図FIG. 1 is a plan view including an omitted part showing an embodiment of the present invention.
【図2】図1の平面型蛍光管の正面図FIG. 2 is a front view of the flat fluorescent tube of FIG.
【図3】図2のA−A線に沿う断面図3 is a sectional view taken along the line AA of FIG.
【図4】(a)及び(b)は、図1の平面型蛍光管の放
電路両端に配置される電極の平面図及び断面図4 (a) and (b) are a plan view and a cross-sectional view of electrodes arranged at both ends of the discharge path of the flat fluorescent tube of FIG.
【図5】(a)及び(b)は、図1の平面型蛍光管の放
電路中央に配置される電極の平面図及び断面図5 (a) and 5 (b) are a plan view and a cross-sectional view of an electrode arranged at the center of the discharge path of the flat fluorescent tube of FIG.
【図6】本発明の他の実施例を示す要部の平面図FIG. 6 is a plan view of a main part showing another embodiment of the present invention.
【図7】従来の平面型蛍光管の一部省略部分を含む平面
図FIG. 7 is a plan view including a partially omitted portion of a conventional flat fluorescent tube.
【図8】図7の平面型蛍光管の正面図FIG. 8 is a front view of the flat fluorescent tube of FIG.
【図9】図8のB−B線に沿う断面図9 is a sectional view taken along line BB of FIG.
1 放電路 1a 屈曲した端部 1b 蛇行放電部 1d 蛇行放電部 2 電極 3 電極 4 ガラス板 5 ガラス板 12 蛍光ランプ 12a 屈曲した端部 13 電極 DESCRIPTION OF SYMBOLS 1 Discharge path 1a Bent end 1b Meandering discharge part 1d Meandering discharge part 2 Electrode 3 Electrode 4 Glass plate 5 Glass plate 12 Fluorescent lamp 12a Bend end 13 electrode
Claims (5)
を、放電路内の放電方向と略直交方向に屈曲させ、この
端部の屈曲点から所定距離の奥部分に電極を配置したこ
とを特徴とする平面型蛍光管。1. An end portion of a strip-shaped discharge path having electrodes at both ends is bent in a direction substantially orthogonal to a discharge direction in the discharge path, and an electrode is arranged in a deep portion at a predetermined distance from a bending point of the end portion. A flat fluorescent tube characterized by the above.
の間に放電路を形成した請求項1記載の平面型蛍光管。2. The flat fluorescent tube according to claim 1, wherein a discharge path is formed between two glass plates which are closely adhered and overlapped.
請求項1記載の平面型蛍光管。3. The flat fluorescent tube according to claim 1, wherein the discharge path is formed by a thin tubular fluorescent lamp.
の屈曲された両端部とこの両端部間の180゜蛇行する
蛇行放電部を一直線上に並べて形成し、この放電路の一
直線上に並ぶ両端部の奥部分と蛇行放電部の中央に電極
を配置して、蛇行状放電路を各電極間の複数の放電路に
分割した請求項1記載の平面型蛍光管。4. A discharge path is formed in a meandering shape on a rectangular plane, and both ends of the discharge path, which are bent, and a meandering discharge part that meanders 180 ° between the ends are formed in a straight line. 2. The flat fluorescent tube according to claim 1, wherein electrodes are arranged in the inner portions of both ends arranged in a line and in the center of the meandering discharge portion to divide the meandering discharge path into a plurality of discharge paths between the electrodes.
て形成すると共に、放電路の4条の略直線状の直線放電
部の幅を、隣接する各直線放電部を連通する蛇行放電部
の幅より大きくし、4条の直線放電部の中央部分を順に
小、大、小の異なる2段階の間隔で隣接させ、かつ、放
電路の中央の蛇行放電部を除く2つの隣接する蛇行放電
部が矩形平面の一辺に平行で、この各蛇行放電部の内側
端部が矩形平面の一辺の中央近傍に張り出し、各蛇行放
電部の外側端部が矩形平面の一辺の両端の角近傍まで張
り出している請求項4記載の平面型蛍光管。5. A discharge path is formed to meander in a W shape on a rectangular flat surface, and the width of the four substantially linear linear discharge portions of the discharge path is defined by the meandering width that connects adjacent linear discharge portions. The width is larger than the width of the discharge portion, and the central portions of the four linear discharge portions are adjacent to each other at two different intervals of small, large, and small, and adjacent to each other except the meandering discharge portion at the center of the discharge path. The meandering discharge part is parallel to one side of the rectangular plane, the inner end of each meandering discharge part projects near the center of one side of the rectangular plane, and the outer end of each meandering discharge part is near the corners of one side of the rectangular plane. The flat fluorescent tube according to claim 4, which extends to the extent.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2773794A JPH07240179A (en) | 1994-02-25 | 1994-02-25 | Flat fluorescent tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2773794A JPH07240179A (en) | 1994-02-25 | 1994-02-25 | Flat fluorescent tube |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07240179A true JPH07240179A (en) | 1995-09-12 |
Family
ID=12229350
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2773794A Withdrawn JPH07240179A (en) | 1994-02-25 | 1994-02-25 | Flat fluorescent tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07240179A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007324131A (en) * | 2006-05-29 | 2007-12-13 | Samsung Corning Co Ltd | Surface light source device and back light unit having the same |
-
1994
- 1994-02-25 JP JP2773794A patent/JPH07240179A/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007324131A (en) * | 2006-05-29 | 2007-12-13 | Samsung Corning Co Ltd | Surface light source device and back light unit having the same |
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