JPS60112243A - Fluorescent lamp for display element - Google Patents

Abstract

PURPOSE:To improve high brightness and mechanical strength in the nearly U- shaped curved section of a luminous tube with an electrode on both ends and with the inside surface coated with a phosphor by thinning the thickness of the curved outside surface and thickening the thickness of the curved inside surface. CONSTITUTION:Several hundreds or tens of thousands of display elements 2 are juxtaposed on a screen board 1. The elements 2 are formed by housing a luminous tube 3 in an outside cylinder 11. The luminous tube 3 forms a U-shaped curved section 5 between both ends 4 and 4 by bending a straight tube type bulb made of soft glass whose tube inside diameter is 10mm., whose tube lendth is 100mm., and whose thickness is 1.0mm. at the central part between both ends 4 and 4 almost in a U-shaped form. Electrode filaments 7 and 7 coated with electron emission material are sealed on both ends 4 and 4 and a preset amount of mercury and starting rare gas are sealed in the luminous tube 3. Besides, the inner part of the luminous tube 3 is coated with a phosphor coating that emits monochrome red, green, or blue. The curved section 5 thins the thickness of an outside surface 9 and thickens the thickness of an inside surface 10. The curved section 5 is positioned at the opening 12 of the outside cylinder 11. As a result, high brightness and mechanical strength can be improved.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明はカラー映像表示装置等の光源として用いられる
けい光ランプに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fluorescent lamp used as a light source for color image display devices and the like.

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

野球場や競技場等のスコアボードに組み込まれた大型の
表示装置は、スクリーンが一ド上に数千ないし数万個の
表示素子を密に並設し、これら表示素子を画像信号に応
じて適宜点灯させることにより、スクリーンポード上に
テレビカメラやＶＴＲに収録された映像を写し出すよう
になっている。Large display devices built into scoreboards at baseball stadiums, stadiums, etc. have thousands or tens of thousands of display elements arranged closely on one screen, and these display elements are connected in response to image signals. By turning on the lights as appropriate, images recorded on a TV camera or VTR are projected onto the screen pod.

この種装置の表示素子としては、現在赤、緑。Currently, the display elements for this type of device are red and green.

青の単色を発する例えばＣＲＴを組み合わせたものと、
同じく赤、緑、青の透光性塗料を塗布した力２−電球を
組み合わせたものが知られている。ところが、ＣＲＴは
消費電力が少なく発光効率も比較的高い等の利点な一有
するものの、その輝度が低いために昼間のように周囲が
明るいと映像が不鮮明なものとなり、さらに、ＣＲＴ自
体が高価であるためコスト高となる難点がある。一方カ
ラー電球は、輝度は高いが反面消費電力が多い上に残像
時間が長く、動きの早い映像には追随が不十分で映像が
不鮮明となり、かつ寿命も短い等の欠点がある。For example, a combination of CRTs that emit a single color of blue,
Similarly, a combination of power 2 light bulbs coated with red, green, and blue translucent paint is known. However, although CRTs have advantages such as low power consumption and relatively high luminous efficiency, their low brightness makes images unclear in bright surroundings such as during the day, and CRTs themselves are expensive. Therefore, there is a drawback that the cost is high. On the other hand, color light bulbs have high brightness, but have drawbacks such as high power consumption, long afterimage time, insufficient tracking of fast-moving images, resulting in unclear images, and short lifespan.

そこで、他の表示素子としてけい光ラングの使用が考え
られる。けい光ランプは消費電力も少なく長寿命で、し
かも高輝度でコストも比較的安価であることは周知の通
りであり、この点から見れは表示素子として好適するも
のであると言える。そしてこの場合、鮮明で良質な映像
を得るためには、上記けい光ランプも従来のＣＲＴやカ
ラー電球と同板にスクリーンボード上に密に並設する必
要があり、このため最近では、けい光ランプをＵ字状に
折り曲げてコン・セクト化を図り、そのＵ字形の曲成部
を発光部として利用する試みがなされている、 ところで、この種けい光ランプは、直管形の発光管パル
プの中央部をバーナ等で加熱した後、この中央部をＵ字
状に折り曲げているが、従来ではパルプの加熱時に、パ
ルプもしくはバーナの一方を回転させて加熱部分の温間
分布を周方向に均等化し、曲成部の肉厚が全周および全
長に亘って均一となるように曲成している。Therefore, it is possible to use a fluorescent rung as another display element. It is well known that fluorescent lamps consume less power, have a long life, have high brightness, and are relatively inexpensive, and from this point of view they can be said to be suitable as display elements. In this case, in order to obtain clear, high-quality images, the fluorescent lamps mentioned above must be placed closely on the screen board on the same board as the conventional CRT and color light bulbs. Attempts have been made to bend the lamp into a U-shape to make it into a consection, and to use the U-shaped bent part as a light-emitting part.By the way, this type of fluorescent lamp is made of straight arc tube pulp. After heating the central part with a burner etc., this central part is bent into a U-shape. Conventionally, when heating the pulp, either the pulp or the burner is rotated to change the warm distribution of the heated part in the circumferential direction. It is curved so that the thickness of the curved portion is uniform over the entire circumference and length.

しかしながら、このけい光ランプは曲成部の曲げ外側の
面を表示方向に向けた姿勢で点灯されるため、発光に寄
与するのはその大部分が曲成部の曲げ外側の面からの光
であり、このことから曲げ外側の面の光透過率を高める
ために肉厚を薄くすると、曲成郡全体の肉厚が薄くなっ
てしまい、このため曲成部の機械的強度が低下し、衝撃
や荷重が加わった場合に破損し易くなる。したがって、
一般的に曲成部の肉厚はある程度確保しなくてはならず
、この結果、光透過率ひいては輝度の低下がもたらされ
、画質が低下する等の問題が生じる。However, since this fluorescent lamp is lit with the outside surface of the curved section facing toward the display direction, most of the light that contributes to light emission is from the outside surface of the curved section. Therefore, if the wall thickness of the outer surface of the bend is made thinner to increase the light transmittance, the wall thickness of the entire curved part becomes thinner, which reduces the mechanical strength of the bent part and reduces the impact resistance. It becomes easy to break when a load is applied. therefore,
Generally, the thickness of the curved portion must be maintained to a certain extent, which results in a decrease in light transmittance and, ultimately, brightness, resulting in problems such as a decrease in image quality.

〔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、
高輝度でしかも機械的強度も充分に確保できる表示素子
用けい光ラングの提供を目的とする。The present invention was made based on these circumstances, and
The purpose of the present invention is to provide a fluorescent rung for a display element that has high brightness and also has sufficient mechanical strength.

〔発明の概要〕[Summary of the invention]

すなわち、本発明は上記目的を達成するため、曲成部の
曲げ外側の面の肉厚を薄く、かつ曲げ内側の面の肉厚を
厚く形成し、この曲成部の肉厚を周方向に活って変化さ
せたことを特徴とする。That is, in order to achieve the above-mentioned object, the present invention forms the wall thickness of the curved portion on the outer side of the curve to be thin and the wall thickness on the inner side of the curve to be thick, and increases the thickness of the curved portion in the circumferential direction. It is characterized by being alive and changing.

〔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スコアｙｌ？　−ド等
に組み込まれる大型の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ボード１には、数千ないし数
万個の表示素子２・・・が密に並置されている。これら
表示素子２・・・はＵ字形に曲成された曲管形けい光ラ
ングであり、このけい光ランプの詳細については第２図
以降に示されている。すなわち、３は発光管であり、本
実施例の発光管３は管内径１０朋、管長１００話、肉厚
１．Ｏｕである軟質ガラス製の直管形ノ々ルブを、その
両端部４，４間の中央部で略Ｕ字状に屈曲し、これら両
端部４，４間にＵ字形の曲成部５を形成したものである
。そしてこの発光管３の両端部４，４には、夫々電子放
射性物質が塗布された電極フィラメント７．７が封着さ
れているとともに、発光管３内には所定量の水銀と始動
用の希ガスが封入はれている。また発光管３の内面には
、赤、緑、青のいずれかの単色光を発するけい光体被膜
８が被着されてｂする。Figure 1 shows, for example, the score yl of a baseball field or stadium? 1 shows an outline of a large-sized display screen incorporated in a board, etc. On a screen board 1 having a substantially rectangular shape, thousands to tens of thousands of display elements 2 are closely arranged side by side. These display elements 2 are U-shaped curved fluorescent lamps, and the details of this fluorescent lamp are shown in FIGS. 2 and subsequent figures. That is, 3 is an arc tube, and the arc tube 3 of this embodiment has an inner diameter of 10 mm, a length of 100 mm, and a wall thickness of 1. A straight tube shaped knoble tube made of soft glass is bent into a substantially U-shape at the center between both ends 4, 4, and a U-shaped bent part 5 is formed between these ends 4, 4. It was formed. Electrode filaments 7 and 7 each coated with an electron radioactive substance are sealed to both ends 4 and 4 of the arc tube 3, and a predetermined amount of mercury and a starting diluted metal are contained within the arc tube 3. It is filled with gas. Further, on the inner surface of the arc tube 3, a phosphor coating 8 that emits monochromatic light of red, green, or blue is coated.

しかして、このような発光管３の曲成部５は、その曲げ
外側の面９の肉１’Ｍ−ｔ　Ｉが薄く、これと対向する
曲は内側１の面１０の肉厚ｔ、が厚く形成され、肉厚が
周方向に活って不均一となっている。ずなわち、この曲
成部５は直管形パルプの両端部４，４に電極フイラメ７
ト７，７を封着し、かつ内面にけい光体被膜８を被層し
た後１この直管形パルプの軸方向に涜５中央部を・ぐ−
す等により曲げ外側の面９となる倶１が高温で、曲げ内
側の面１０となる側が低温となるように不均一な温度に
加熱し、この状態で上記高温部分を曲げ外側として略Ｕ
字状に折り曲げることにより形成したもので、上記加熱
温度にもとづくがラスの（１”　Ｑ−具合の違いにより
、曲成部５の肉厚が上述の如く不均一に形成されている
。このような発光管３は夫々外筒１１内に収容式れてい
る。外筒１）は一端が開口されるとともに、内面が光反
射面をなした有底円筒状に形成され、この外筒１１の開
口部１２内に上記発光管３の曲成部５が位置されている
。そして外筒１１は開口部１２を表示方向に向けた姿勢
でスクリーンボード１上に密に並設されており、このた
め発光管３は曲成部５を発光部として、その曲げ外側の
面９を表示方向に向けた姿勢で保持されている。Therefore, in such a curved portion 5 of the arc tube 3, the wall 1'M-tI of the curved outer surface 9 is thin, and the wall thickness t of the curved inner surface 10 of the curved portion opposite to this is thin. It is formed thickly, and the thickness is uneven in the circumferential direction. That is, this bent portion 5 has electrode filaments 7 at both ends 4, 4 of the straight pulp.
After sealing the plates 7 and 7 and coating the inner surfaces with a phosphor coating 8,
The surface 9 on the outside of the bend is heated to a non-uniform temperature such that the surface 9 on the outside of the bend is at a high temperature, and the side that is the inside surface 10 of the bend is at a low temperature.
It is formed by bending it into a letter shape, and the thickness of the bent portion 5 is formed non-uniformly as described above due to the difference in the (1" Q) condition of the lath, although it is based on the above-mentioned heating temperature. Each of the arc tubes 3 is housed in an outer cylinder 11.The outer cylinder 1) is formed into a bottomed cylindrical shape with an open end and a light reflecting surface on the inner surface. The curved portion 5 of the arc tube 3 is located within the opening 12.The outer cylinder 11 is closely arranged in parallel on the screen board 1 with the opening 12 facing the display direction. Therefore, the arc tube 3 is held with the curved portion 5 serving as a light emitting portion, with its curved outer surface 9 facing the display direction.

なお、スクリーンビートノ上の谷けい光２ンゾは点灯装
置を介して電源にＪχ続され、この点灯装置を画像制御
部で制御することにより、けい光ランプが適宜点灯する
とともに、投入電力が調整されて任意の混合色が得られ
、種々の映像がスクリーンボード１上に写し出されるよ
うになっている。The two fluorescent lights above the screen beat are connected to the power supply via a lighting device, and by controlling this lighting device with the image control unit, the fluorescent lamps are lit as appropriate and the input power is controlled. By adjusting the colors, any mixed color can be obtained, and various images can be projected on the screen board 1.

このような構成のけい光ランプによれば、発光部として
の曲げ外側の面９の肉厚ｔ１を薄く形成したので、この
面９の光透過率が高くなり、このため輝度が向上し、鮮
明な画像が得られる。According to the fluorescent lamp having such a configuration, since the wall thickness t1 of the curved outer surface 9 serving as the light emitting portion is formed to be thin, the light transmittance of this surface 9 is increased, thereby improving the brightness and providing a clear image. You can get a good image.

また、曲げ外側の面８と対向する曲げ内側の面１０の肉
厚ｔ２は厚く形成しであるので、曲成部５の機械的強度
は曲げ内側の面１０で確保することかでき、よ・りて衝
撃に対しても強く、破損し難くなる。In addition, since the wall thickness t2 of the surface 10 on the inside of the bend, which faces the surface 8 on the outside of the bend, is formed to be thick, the mechanical strength of the bent portion 5 can be ensured by the surface 10 on the inside of the bend, and the It is strong against impact and is less likely to be damaged.

なお、本発明者らは曲成部５の曲げ外側の面９の肉厚ｔ
１を夫々０．２　’ＩＮｊＡ、　０．４１１１Ｊ、　０
．６　ｕｚＯ，８７ＪＡとし、かつ曲げ内側の面１０の
肉厚ｔ２を０．９１１Ｕｆ１以上に設定した出力６Ｗ級
のＵ字形けい光ランプを１０本づつ製作し、曲成部５の
輝度を測定したところ、第５図に示すような結果を得た
。この実験では、従来構成のけい光ランプの□輝度値を
１００（％）としたときの相対値で評価しており、この
第５図からもゆ１らかなように、曲は外側の面９の肉厚
ｔ、を薄くする程、輝度の向上が認められる。In addition, the present inventors have determined that the wall thickness t of the surface 9 on the outside of bending of the bending portion 5
1 to 0.2 'INjA, 0.4111J, 0
．． 6uzO, 87JA, and the wall thickness t2 of the bent inner surface 10 was set to 0.911Uf1 or more, 10 U-shaped fluorescent lamps with an output of 6W class were manufactured, and the brightness of the curved part 5 was measured. , the results shown in FIG. 5 were obtained. In this experiment, the □brightness value of the fluorescent lamp with the conventional configuration was evaluated as a relative value when it was taken as 100 (%), and as is clear from this Figure 5, the curve is The brightness is improved as the wall thickness t is made thinner.

なお、上記結果はランプ出力や発光管３の材負およびけ
い光体被膜８の種類を変えた場合でも大差なかった。Note that the above results did not differ much even when the lamp output, the material of the arc tube 3, and the type of phosphor coating 8 were changed.

また上述した実施例では、発光管の成形に当ってけい光
体被膜や電極フィラメントを取着したのち、ガラスバル
ブをＵ字形に折り曲けたが、これとは逆にまずパルプを
Ｕ字形に折り曲けたのち、けい光体被膜の被着や電極フ
ィラメントの封着を行っても良い。Furthermore, in the above-mentioned embodiment, the glass bulb was bent into a U-shape after attaching the phosphor coating and electrode filament when molding the arc tube, but in contrast to this, the pulp was first folded into the U-shape. After bending, a phosphor film may be applied or an electrode filament may be sealed.

さらに、本発明に係るけい光ランプの曲げ形状はＵ字形
に特定されるものではなく、Ｕ字形の発光管をさらにＵ
字形に折り曲げたいわゆる鞍形状としても良い。Furthermore, the bending shape of the fluorescent lamp according to the present invention is not limited to a U-shape, and the U-shaped arc tube is further formed into a U-shape.
It may be bent into a so-called saddle shape.

〔発明の効果〕〔Effect of the invention〕

以上詳述した本発明によれば、発光部として機能する曲
成部の曲げ外側の面の光透過率が高くなるので、輝度が
同上し鮮明な画像が得られる。しかも曲成郡全体の機械
的強度は厚肉な曲げ内側の面で確保できるので、衝撃や
荷重に対しても強くなり、破損し難くなる利点がある。According to the present invention described in detail above, the light transmittance of the curved outer surface of the curved portion functioning as a light emitting portion is increased, so that brightness is the same and a clear image can be obtained. Moreover, the mechanical strength of the entire curved structure can be ensured by the thick inner surface of the curved surface, which has the advantage of being strong against impact and load, and less likely to break.

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

図面は本発明の一笑施例を示し、第１図は表示スクリー
ンの概略構成図、第２図はけい光ランプを一部断面で示
す正面図、第３図は第２図中ト４線に沿う断面図、第４
図は斜視図、第５図は特性図である。 ３・・・発光管、５・・・曲成部、７・・・電極（フィ
ラメント）、８・・・けい光体（けい光体被膜）、９・
・・曲げ外側の面、１ｏ・・・曲げ内側の面。 出願人代理人　弁理士　鈴　江　武　彦第１図 第２図　第３図 第４図 第５図 曲１ｊ外側の面の肉屋（ｍｍ）The drawings show an embodiment of the present invention; FIG. 1 is a schematic configuration diagram of a display screen, FIG. 2 is a partially sectional front view of a fluorescent lamp, and FIG. Sectional view along, 4th
The figure is a perspective view, and FIG. 5 is a characteristic diagram. 3... Arc tube, 5... Bent part, 7... Electrode (filament), 8... Luminescent body (phosphor coating), 9...
...Bending outer surface, 1o...Bending inner surface. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Butcher on the outside surface of track 1j (mm)

Claims (1)

【特許請求の範囲】[Claims] 電極間に略Ｕ字状の曲成部を有し、かつ内面にけい光体
が被着された発光管を、その曲成部の曲げ外側の面を表
示方向に向けた姿勢で点灯させるけい光ランプであって
、上記曲成部の曲げ外側の面の肉厚を薄く、かつ曲げ内
側の面の肉厚を厚く形成したことを特徴とする表示素子
用けい光ランプ。A light emitting tube that has a substantially U-shaped curved section between electrodes and has a phosphor coated on its inner surface is turned on with the bent outer surface of the curved section facing the display direction. 1. A fluorescent lamp for a display element, wherein the curved portion has a thin outer surface and a thick inner surface.