JPS59128757A - Low pressure mercury vapor discharge lamp for display device - Google Patents

Abstract

PURPOSE:To cause a positive column to extend between a pair of inner tubes, installed in an outer tube, along a direction perpendicular to a discharge path and display direction so as to realize a sufficient luminous surface area and a sufficient luminous intensity by restricting the maximum distance between the openings of the inner tubes and the inner surface of the outer tube. CONSTITUTION:After a hollow cylindrical outer tube 3 with large diameter is formed by the use of a light-transmitting material such as glass, one end of the outer tube 3 is closed and curved in spherical form to make a spherical section 4. Next the inner surface of the spherical section 4 is coated with a phosphor film 5 emitting red, green or blue monochromatic light. After that, electrode filaments 10 and 10 are fixed to two areas of an end glass plate 7, then ends of a pair of tubular inner glass tubes 11 and 11 are fused to the end plate 7 in such a manner that the filaments 10 and 10 are surrounded by the inner tubes 11 and 11. It is desirable that the diameter (L) of the outer tube 3 is not more than 50mm.. In addition, the maximum distance (l) between the outer open ends of the inner tubes 11 and 11 and the inner surface of the spherical area 4 is restricted to below 15mm., so that electric discharge with luminous intensity sufficient for display is carried out stably.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は野球場や競技場に設置された表示スクリーンあ
るいは道路情報を示す表示装置において、その表示素子
として用いられる低圧水銀蒸気放電灯に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a low-pressure mercury vapor discharge lamp used as a display element in a display screen installed at a baseball stadium or stadium or a display device showing road information.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

最近、野球場や競技場等においては、テレビカメラやＶ
ＴＲに納められた画像を大型の表示スクリーン上に写し
出して表示するディスプレイ装置が設置されている。こ
の装置は表示スクリーン上に数千ないし数万個の表示素
子を密に配置し、これら表示素子を画像信号に応じて選
択的に適宜点灯させることによ多１．上記表示スクリー
ン上に所定の画像を表示するようになっている。Recently, television cameras and video cameras are being used at baseball fields and stadiums.
A display device is installed that projects and displays images stored in the TR on a large display screen. This device has several thousand to tens of thousands of display elements arranged densely on a display screen, and these display elements are selectively turned on in accordance with image signals. A predetermined image is displayed on the display screen.

ところで、この種の表示素子としては、現在電子ビーム
によシ単色を発光させるものと、透光性塗料を塗布した
電球により単色を発光させるものが知られている。しか
しながら、上記電子ビームは消費電力が少なく長寿命で
ある等の利点を有するが、表示素子自体が高価なものと
なるためコスト高となる難点がある。また電球は発光素
子自体が安価で制御回路も簡単となる等の利点はあるが
、反面消費電力が大きくかつ寿命が短い等の欠点を肴し
ている。Incidentally, currently known display elements of this type include those that emit a single color using an electron beam and those that emit a single color using a light bulb coated with translucent paint. However, although the electron beam has advantages such as low power consumption and long life, it has the disadvantage that the display element itself is expensive, resulting in high cost. Although light bulbs have advantages such as the light-emitting element itself being inexpensive and the control circuit being simple, they also suffer from disadvantages such as high power consumption and short lifespan.

そこで、他の表示素子としてけい光ランプに代表される
低圧水銀蒸気放電灯の使用が考えられる。けい光ランプ
は消費電力が少なく長寿命で、しかも輝度が高くコス）
・も比較的安価であることは周知の通シであシ、この点
から見れば表示素子として必要な点を充分に満たしてい
ると言える。しかしながら、けい光ランプの発光管は電
球等に比べて細いので、上述の如きディスプレイ装置の
表示素子として利用することを考慮すると、発光面積が
不充分でいまだ実用化されていなかった。Therefore, it is conceivable to use a low-pressure mercury vapor discharge lamp, typified by a fluorescent lamp, as another display element. Fluorescent lamps consume less power, have a long lifespan, and are highly bright and cost-effective)
It is a well-known fact that . However, since the arc tube of a fluorescent lamp is thinner than that of a light bulb or the like, the light emitting area is insufficient for use as a display element in the above-mentioned display device, so that it has not yet been put into practical use.

〔発明の目的〕[Purpose of the invention]

本発明はこのような事情にもとづいてなされたもので、
発光面積を充分に確保できるとともに、発光面の輝度も
高く、上述の如きディスルレイ装置用の表示素子として
何ら問題なく使用できる低圧水銀蒸気放電灯の提供を目
的とする。The present invention was made based on these circumstances, and
The object of the present invention is to provide a low-pressure mercury vapor discharge lamp that can secure a sufficient light-emitting area, has a high luminance on the light-emitting surface, and can be used without any problem as a display element for the above-mentioned display device.

〔発明の概要〕 すなわち、本発明は上記目的を達成するため、一端が閉
塞され、かつ他端が開口された透光性の外管内に、一端
に電極を備えた１対の内管を収容し、これら内管の一端
と上記外管の開口部とを気密に接合してこの開口部を閉
塞することによシ、外管内を放電空間とするとともに、
内管の他端開口部を外管の一端閉塞部内面に離間対向さ
せて設け、この外管の少なくとも上記内管が対向された
一端閉塞部内面にけい光体被膜を被着して発光面とし、
かつ上記内管の他端開口部と外管の一端閉塞部内面との
間の最大離間距離を１５ｗｎ以下に規定したことを特徴
とする。[Summary of the Invention] That is, in order to achieve the above object, the present invention includes a pair of inner tubes each having an electrode at one end housed in a translucent outer tube having one end closed and the other end open. By airtightly joining one end of these inner tubes to the opening of the outer tube and closing this opening, the inside of the outer tube is made into a discharge space, and
An opening at the other end of the inner tube is provided so as to be spaced apart from and opposite to the inner surface of the closed portion at one end of the outer tube, and a phosphor coating is coated on at least the inner surface of the closed portion at one end opposite to the inner tube to form a light emitting surface. year,
Further, the maximum distance between the opening at the other end of the inner tube and the inner surface of the closed end at one end of the outer tube is defined to be 15wn or less.

〔発明の実施例〕[Embodiments of the invention]

以下本発明を図面に示す一実施例にもとづいて説明する
。The present invention will be explained below based on an embodiment shown in the drawings.

第１図は例えば野球場や競技場の一角に設置される大型
な表示スクリーンの概略を示し、略矩形状をなしたスク
リーン？−ド１上には数千ないし数万個の表示素子２・
・・が密に配置されて−る。これら表示素子２・・・は
けい光ランプに代表される低圧水銀蒸気放電灯であシ、
この構造については第２図以降に詳図されている。すな
わち、３は中空円筒状をなした大径な外管であり、ガラ
ス等の透光性材料によって構成されている。外管３の一
端部は閉塞されて球面状に曲成されておシ、この球面部
４の内面には、赤。Figure 1 shows an outline of a large display screen installed in a corner of a baseball field or stadium, for example, and is a roughly rectangular screen. - Thousands to tens of thousands of display elements 2 on the board 1.
...are densely arranged. These display elements 2 are low-pressure mercury vapor discharge lamps such as fluorescent lamps,
This structure is detailed in FIGS. 2 and onwards. That is, 3 is a large diameter outer tube having a hollow cylindrical shape, and is made of a transparent material such as glass. One end of the outer tube 3 is closed and curved into a spherical shape, and the inner surface of this spherical portion 4 has a red color.

緑、青のいずれかの単色光を発するけい光体被膜５が被
着されているとともに、外面には色度補正のための図示
しない透光性被膜が被着されており、したがってこの球
面部４が発光面６となっている。A phosphor coating 5 that emits either green or blue monochromatic light is coated, and a translucent coating (not shown) for chromaticity correction is coated on the outer surface. 4 is a light emitting surface 6.

また７はガラス製の端板であシ、この端板７の径方向に
離間した２個所に貫通封止したリード線８，８および９
，９間には電極フィラメント１０．１０が継線されてい
る。この端板７上には夫々電極フィラメント１０．１０
を囲むようにして直管状をなした１対のガラス製内管１
１．１１の一端部が封着され、電極フィラメント１０．
１０は内管１１．１１の一端に位置５− シている。これら内管１１．１１は外管３よりも格段に
小径に形成され、端板７上において径方向に離間された
状態で立設されている。そしてこのような端板７は外管
３の他端開口部に封着されておシ、この封着によって外
管３内に内管１１．１１が収容されてこれら内管１１　
、１１の他端開口部が上記球面部４に離間対向されると
ともに、外管３内が外方とは区画独立された放電空間１
２となっている。このため内管１ノ。Further, 7 is an end plate made of glass, and lead wires 8, 8 and 9 are penetrated and sealed at two points spaced apart in the radial direction of this end plate 7.
, 9 are connected with electrode filaments 10, 10. On this end plate 7 are electrode filaments 10 and 10, respectively.
A pair of straight glass inner tubes 1 surrounding the
One end of 1.11 is sealed and the electrode filament 10.
10 is positioned at one end of the inner tube 11.11. These inner tubes 11.11 are formed to have a much smaller diameter than the outer tube 3, and are erected on the end plate 7 so as to be spaced apart in the radial direction. Such an end plate 7 is sealed to the other end opening of the outer tube 3, and by this sealing, the inner tubes 11 and 11 are accommodated in the outer tube 3, and these inner tubes 11 and 11 are housed inside the outer tube 3.
, 11 is spaced apart from and opposed to the spherical portion 4, and a discharge space 1 is formed in which the inside of the outer tube 3 is partitioned and independent from the outside.
2. For this reason, the inner tube is 1 no.

１１相互は広い放電空間１２を通じて連通されているこ
とになシ、放電路の途中が大きく広げられている。この
外管３内には端板７から導出された排気管１３を通じて
所定量の水銀と不活性ガスとが封入され、この封入後に
おいて排気管１３は溶断封止される。そしてこのような
構成の表示素子２・・・には夫々図示しない点灯回路が
接続されておシ、これら点灯回路をマイクロコンピュー
タ等の画像制御部で制御することによシ、画像信号に応
じて発光すべき表示素子２・・・の数および位置が変化
し、種々な画像がス６− クリーンポード１上に表示されるようになっている。な
お、上記内管１１．１１における電極フィラメント１０
．１０から他端開口部までの長さは、好ましい例として
ファラデー暗部を越えた３０餌以上としである。11 are communicated with each other through a wide discharge space 12, and the middle of the discharge path is widened. A predetermined amount of mercury and an inert gas are sealed in the outer tube 3 through an exhaust pipe 13 led out from the end plate 7, and after this filling, the exhaust pipe 13 is sealed by fusing. A lighting circuit (not shown) is connected to each of the display elements 2 having such a configuration, and these lighting circuits are controlled by an image control unit such as a microcomputer, so that the display elements 2... The number and position of the display elements 2 to emit light change, and various images are displayed on the screen board 1. Note that the electrode filament 10 in the inner tube 11.11
．． The length from 10 to the opening at the other end is preferably 30 baits or more beyond the Faraday dark area.

またとの釉表示素子２においては、その発光面６の最大
径、つまシ外管３の直径りは５０覇以下に抑えることが
望ましい。すなわち、単一（７）　表示Ｘ子２をスクリ
ーンポード１上に取シ付けて点灯した場合、発光面６の
最大径Ｌ　（＋ｍｎ）とこの発光面６の形状を判別可能
な視認距離（ｍ）とは第４図に示したような関係にある
。また多数個の表示素子２・・・をスクリーンポード１
上に密に並べ、画像制御部に画像信号を与えて必要な個
所の表示素子２・・・を点灯させ、スクリーンポート冒
上に画像を表示した場合、個々の発光面６の最大径Ｌ　
（ｗｎ）と画像の判別可能な距離（ｍ）とは第５図に示
したような関係にある。そして、一般的な野球場や競技
場の広さのことを考えると、発光面６の視認距離は最大
でも１５０ｍ程度となるから、上記両図からも明らかな
ように発光面６の径りは最大でも５０ｍ＋あれば充分で
あることが分る。In addition, in the glazed display element 2, it is desirable that the maximum diameter of the light-emitting surface 6 and the diameter of the outer tube 3 are suppressed to 50 mm or less. That is, when the single (7) display X element 2 is mounted on the screen pod 1 and turned on, the maximum diameter L (+mn) of the light emitting surface 6 and the visible distance (mn) at which the shape of the light emitting surface 6 can be distinguished. ) has the relationship as shown in Figure 4. In addition, a large number of display elements 2... are connected to the screen pod 1.
When displaying an image on the top of the screen port by giving an image signal to the image control unit to light up the necessary display elements 2..., the maximum diameter L of each light emitting surface 6
(wn) and the discriminable distance (m) of the image have a relationship as shown in FIG. Considering the size of a typical baseball field or stadium, the maximum visible distance of the light emitting surface 6 is about 150 m, so as is clear from both figures above, the diameter of the light emitting surface 6 is It turns out that a maximum distance of 50m+ is sufficient.

しかして、上記構成の表示素子２においては、電極フィ
ラメント１０．１０間に放電が生じると、陽光柱は一方
の内管１ノの他端開口部から外管３０球面部４内を通っ
て他方の内管１ノに導ひかれるため、側面略Ｕ字形とな
シ、この陽光柱から放出された紫外線は球面部４内面の
けい光体被膜５に入射してけい光体を励起し、このため
発光面６から可視光線が照射される。そしてこの場合、
本発明に係る一実施例では、内管１１．１１の他端開口
部と球面部４内面との最大離間距離ｔを１５調以下に規
定しである。In the display element 2 having the above configuration, when a discharge occurs between the electrode filaments 10 and 10, a positive column passes from the other end opening of one inner tube 1 to the other end of the outer tube 30 and passes through the spherical surface portion 4 of the outer tube 30. The ultraviolet light emitted from this solar column enters the phosphor coating 5 on the inner surface of the spherical part 4 and excites the phosphor. Therefore, visible light is emitted from the light emitting surface 6. And in this case,
In one embodiment of the present invention, the maximum distance t between the other end opening of the inner tube 11, 11 and the inner surface of the spherical portion 4 is defined to be 15 or less.

すなわち、距離ｔが短い程陽光柱がけい光体被膜５に近
づくので、紫外線強度が強まりけい光体の励起が活発に
行なわれ、逆に距離ｔが大きくなるに従い発光面６に到
達する紫外線強度が弱まり、発光面６における表示方向
への発光強度が小さくなる。そこで本発明者らはランプ
電流を一定としたとき、上記距離ｔを種々変化させて発
光面６上の発光強度を調べた所、第６図に示される如き
結果を得た。この結果から、距離ｔの値が１５諭を上回
った時点から発光強度の推移が大きく変化する傾向にあ
ることを見い出した。したがって、距離ｔの値を１５ｆ
ｆｉＩ＋１以下と規定すれば放電が安定して行なわれ、
かつこの時の発光強度も表示用としては充分なものとな
る。In other words, the shorter the distance t, the closer the sunlight column is to the phosphor coating 5, so the intensity of the ultraviolet rays increases and the phosphor is more actively excited; conversely, as the distance t increases, the intensity of the ultraviolet light reaching the light emitting surface 6 increases becomes weaker, and the intensity of light emitted from the light emitting surface 6 in the display direction becomes smaller. The inventors of the present invention investigated the intensity of light emitted from the light emitting surface 6 by varying the distance t while keeping the lamp current constant, and obtained the results shown in FIG. From this result, it was found that the transition of the luminescence intensity tends to change significantly from the time when the value of the distance t exceeds 15 meters. Therefore, the value of distance t is 15f
If it is defined as less than fiI+1, the discharge will be stable,
Moreover, the emission intensity at this time is also sufficient for display purposes.

このような構成によれば、電極フィラメント１０．１０
に連なる内管１１，１１は、その他端開口部が内管１１
．１１よシも大径な外管３内に連通されているだめ、内
管１１．１１間において放電空間が広がり、したがって
電極フィラメント１０．１０間に生じる陽光柱が内管１
１．１１間つまり球面部４の内側において放電路および
表示方向と直交する方向に広がシ、充分な発光面積が得
られる。しかも放電が広がる部分である内管１１．１１
の他端開口部と球面部４内面との間の最大離間距離を１
５霞以下９− と規定したため、充分な発光強度が得られる。According to such a configuration, the electrode filament 10.10
The other end opening of the inner tubes 11, 11 that are connected to each other is the inner tube 11.
．． Since 11 and 11 are also connected to the large-diameter outer tube 3, the discharge space expands between the inner tubes 11 and 11, and therefore the positive column generated between the electrode filaments 10 and 10 is connected to the inner tube 1.
1.11, that is, inside the spherical portion 4, spreads in a direction perpendicular to the discharge path and the display direction, and a sufficient light emitting area is obtained. Moreover, the inner tube 11.11 is the part where the discharge spreads.
The maximum distance between the other end opening and the inner surface of the spherical part 4 is 1.
Since it is defined as 5 haze or less and 9-, sufficient luminous intensity can be obtained.

まだ陽光柱が部分的に広げられる形となっても、ランプ
電流、電圧等はほとんど変わらず、したがって電気的特
性にはほとんど影響がない。Even if the positive column is still partially expanded, the lamp current, voltage, etc. will hardly change, and therefore the electrical characteristics will have almost no effect.

また内管１１．１１は外管３内に収容されているから、
内管１１，１１およびリード線８゜８および９，９等は
発光面６の方向つまり表示方向からみて球面部４の背後
内側に隠れており、したがって発光面６をスクリーンポ
ード１上に密に並べることができる。Furthermore, since the inner tube 11.11 is housed within the outer tube 3,
The inner tubes 11, 11, lead wires 8° 8, 9, 9, etc. are hidden inside the back of the spherical part 4 when viewed from the direction of the light emitting surface 6, that is, from the display direction. You can line them up.

なお、上述した実施例では、外管の球面部のみにけい光
体被膜を被着したが、このけい光体被膜を外管の内面全
面全体あるいは内管の内面全面全体に被着しても良い。In the above embodiment, the phosphor coating was applied only to the spherical surface of the outer tube, but the phosphor coating could also be applied to the entire inner surface of the outer tube or the entire inner surface of the inner tube. good.

〔発明の効果〕〔Effect of the invention〕

以上詳述した本発明によれば、外管内に１対の内管を収
容するとともに、これら内管の他端開口部を外管の一端
閉塞部内面に離間対向させ、との間の最大離間距離を１
５叫以下に規定したから、電極に生じる陽光柱が内管相
互間におい１０− て放電路および表示方向とは直交する方向に広がり充分
な発光面積が得られ、しかも充分な発光強度が得られる
。また内管は発光面の背後内側に隠れているので、多枚
の発光面を同一方向に向けて並べる場合に内管が邪魔と
ならず、これら発光面を密に並べることができる。According to the present invention described in detail above, a pair of inner tubes are accommodated within an outer tube, and the other end openings of these inner tubes are spaced apart and opposed to the inner surface of the one end closed part of the outer tube, and the maximum distance between distance 1
Since it is specified to be less than 5 mm, the positive column generated at the electrodes spreads between the inner tubes in a direction perpendicular to the discharge path and the display direction, and a sufficient luminous area is obtained, and sufficient luminous intensity is obtained. . Furthermore, since the inner tube is hidden behind and inside the light emitting surface, the inner tube does not get in the way when multiple light emitting surfaces are lined up facing the same direction, and these light emitting surfaces can be arranged closely.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明の一実施例を示し、第１図は表示スクリー
ンの概略構成図、第２図は表示素子の分解斜視図、第３
図は断面図、第４図および第５図は発光面の直径と視認
距離との関係を示す特性図、第６図は発光面の発光強度
の推移を示す特性図である。 ３・・・外管、６・・・発光面、１０・・・電極（電極
フィラメント）、１１・・・内管、１２・・・放電空間
。 出願人代理人　　弁理士　鈴　江　武　彦１１− 第１図 へ 城 −２［ 第３図 Ｉ！４図 第５図 里２００ イ１１２ ’ａ−−−− １編ごト 可 糺 ℃１；The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic configuration diagram of a display screen, Fig. 2 is an exploded perspective view of a display element, and Fig. 3 is an exploded perspective view of a display element.
The figure is a sectional view, FIGS. 4 and 5 are characteristic diagrams showing the relationship between the diameter of the light emitting surface and the visible distance, and FIG. 6 is a characteristic diagram showing the transition of the light emission intensity of the light emitting surface. 3... Outer tube, 6... Light emitting surface, 10... Electrode (electrode filament), 11... Inner tube, 12... Discharge space. Applicant's agent Patent attorney Takehiko Suzue 11- Figure 1 Castle-2 [ Figure 3 I! Figure 4 Figure 5 ri 200 112 'a---- 1 part is available ℃1;

Claims (1)

【特許請求の範囲】[Claims] 一端が閉塞されるとともに他端が開口された透光性の外
管内に、一端に電極が封着された１対の内管を収容し、
これら内管の一端と上記外管の他端開口部とを気密に接
合してこの他端開口部を閉塞することにより、外管内を
放電空間とするとともに、内管の他端開口部を上記外管
の一端閉塞部内面に離間対向させて設け、この外管にお
ける少なくとも上記内管が対向された一端閉塞部内面に
けい光体被膜を被着して発光面とし、かつ上記内管の他
端開口部と外管の一端閉塞部内面との間の最大離間距離
を１５■以下に規定したことを特徴とする表示素子用低
圧水銀蒸気放電灯。A pair of inner tubes each having an electrode sealed at one end are accommodated in a translucent outer tube that is closed at one end and open at the other end,
By airtightly joining one end of these inner tubes to the other end opening of the outer tube and closing the other end opening, the inside of the outer tube becomes a discharge space, and the other end opening of the inner tube is closed. one end of the outer tube is provided so as to be spaced apart from and facing the inner surface of the closed portion of the outer tube, and a phosphor coating is coated on the inner surface of the closed portion of at least one end of the outer tube that is opposed to the inner tube as a light emitting surface; A low-pressure mercury vapor discharge lamp for a display element, characterized in that the maximum distance between the end opening and the inner surface of the one-end closed part of the outer tube is set to 15 cm or less.