JPH10284008A - External electrode type fluorescent lamp - Google Patents
External electrode type fluorescent lampInfo
- Publication number
- JPH10284008A JPH10284008A JP8249897A JP8249897A JPH10284008A JP H10284008 A JPH10284008 A JP H10284008A JP 8249897 A JP8249897 A JP 8249897A JP 8249897 A JP8249897 A JP 8249897A JP H10284008 A JPH10284008 A JP H10284008A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- lamp
- axis direction
- tube axis
- fluorescent lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ファクシミリ、複
写機、イメージリーダ等の情報機器における原稿照明、
あるいは、液晶パネルディスプレイのバックライト等に
利用される外部電極型蛍光ランプに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to illumination of a document in information equipment such as a facsimile, a copying machine, an image reader,
Alternatively, the present invention relates to an external electrode type fluorescent lamp used for a backlight or the like of a liquid crystal panel display.
【０００２】[0002]
【従来の技術】原稿照明に利用される光源のなかでも縮
小光学系を利用する場合、レンズを透過した光は、レン
ズ中央部よりレンズ周辺部ではコサイン４乗則により急
激に光量が減衰する。このため、ランプ端部の光量を上
げることでレンズ通過後の光量均一化を図っている。こ
の具体例としては、例えば実開昭６０−１１７５５７号
公報にみられるようにランプ内面にアパーチャを設け、
アパーチャの開口角をランプ端部において小さくするこ
とで端部の光量を上げる方法が考案されている。2. Description of the Related Art When a reduction optical system is used among light sources used for illuminating a document, the amount of light transmitted through a lens is rapidly attenuated from the center of the lens to the periphery of the lens by the cosine fourth power rule. For this reason, by increasing the amount of light at the end of the lamp, the amount of light after passing through the lens is made uniform. As a specific example of this, an aperture is provided on the inner surface of the lamp as shown in Japanese Utility Model Laid-Open No. 60-117557, for example.
A method has been devised in which the opening angle of the aperture is reduced at the end of the lamp to increase the amount of light at the end.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術にみられ
るように、ランプ内部の軸方向に沿って蛍光体膜のアパ
ーチャ開口角を変えることは、製造工程が複雑になると
いった問題がある。また、外部電極型蛍光ランプには管
軸方向に少なくとも一対の電極が配設されている場合が
多く、この一対の電極の間にアパーチャ部を設ける構造
も考えられる。しかしながら、上記のように電極の形状
によりアパーチャを形成すると、電極形状が複雑にな
り、また、ランプ端部で電極同士が近接し、沿面放電に
対する対策が必要となる。本発明の目的は、上記事情を
考慮してなされたものであって、アパーチャの形状を変
えることなく管軸方向の配光特性を自由に変えることが
でき、かつ、製造が容易な外部電極型蛍光ランプを提供
することである。As seen in the above prior art, changing the aperture opening angle of the phosphor film along the axial direction inside the lamp has a problem that the manufacturing process becomes complicated. Further, in many cases, at least a pair of electrodes are provided in the tube axis direction in the external electrode type fluorescent lamp, and a structure in which an aperture is provided between the pair of electrodes may be considered. However, when the aperture is formed by the shape of the electrode as described above, the shape of the electrode becomes complicated, and the electrodes come close to each other at the end of the lamp, so that it is necessary to take measures against creeping discharge. The object of the present invention has been made in view of the above circumstances, and it is possible to freely change the light distribution characteristics in the tube axis direction without changing the shape of the aperture, and it is easy to manufacture an external electrode type. It is to provide a fluorescent lamp.
【０００４】[0004]
【課題を解決するための手段】本発明者等は、種々実験
を行った結果、図１に示す外部電極型蛍光ランプ１０
（以下必要に応じてランプと略記する）において、上記
外部電極２．２’に透光性部分を設け、上記透光性部分
における開口部の形状を変化させると照度が変わること
を見い出した。なお、本発明における上記透光性部分と
は、電極面上において、例えば図１に示すように複数の
開口部２ａ，２ｂを有した部分であり、この開口部２
ａ，２ｂを通してランプ１０の光がガラスバルブ外部に
放出される電極部分をいう。上記透光性部分は網状体や
多孔体等から形成される。網状体は、格子状の網や多角
形状の網から形成することができ、多孔体は、電極面に
多数の孔（開口）を設けることにより形成される。多孔
体の開口部の形状は丸形、楕円形、あるいは菱形、四角
形等の多角形等の種々の形状が実現可能である。さら
に、図９のように電極部分にスリットを形成し、スリッ
トの幅を管軸方向で変化させるようにしてもよい。ま
た、図１０のように、管軸方向で矩形波形状に沿ってジ
グザグ状の電極を配置してもよい。The present inventors conducted various experiments and found that the external electrode type fluorescent lamp 10 shown in FIG.
(Hereinafter, abbreviated as a lamp as necessary), it has been found that the illuminance changes when a transparent portion is provided on the external electrode 2.2 ′ and the shape of the opening in the transparent portion is changed. The translucent portion in the present invention is a portion having a plurality of openings 2a and 2b on the electrode surface as shown in FIG. 1, for example.
A part of the electrode where the light of the lamp 10 is emitted to the outside of the glass bulb through a and 2b. The translucent portion is formed from a net-like body, a porous body, or the like. The mesh body can be formed from a grid-like mesh or a polygonal mesh, and the porous body is formed by providing a large number of holes (openings) on the electrode surface. Various shapes such as a round shape, an elliptical shape, or a polygonal shape such as a rhombus or a quadrangle can be realized as the shape of the opening of the porous body. Further, a slit may be formed in the electrode portion as shown in FIG. 9 and the width of the slit may be changed in the tube axis direction. Further, as shown in FIG. 10, zigzag electrodes may be arranged along a rectangular wave shape in the tube axis direction.
【０００５】開口部の形状に応じて外部電極型蛍光ラン
プの照度を次のように変化させることができる。 開口率を変化させる 透光性を有する電極の管軸方向で開口率を変えたランプ
を試作し、照度を測定したところ、図２の実線に示すよ
うに開口率により照度が変わることを見い出した。ここ
で、開口率とは、開口部を含めた電極単位面積当たりの
開口部の面積を言うこととし、電極単位面積当たりの開
口部分の面積をＳｈとし、開口部分を含めた電極部分の
単位面積をＳｅとすると、次の式で表わされる。 開口率＝（Ｓｈ／Ｓｅ）×１００％ この現象を利用することにより、例えば外部電極型蛍光
ランプの中央部の開口率を端部付近より上げることで、
ランプ端部の照度を中央部よりアップすることができ
る。The illuminance of the external electrode type fluorescent lamp can be changed as follows according to the shape of the opening. Changing the aperture ratio A prototype of a lamp whose aperture ratio was changed in the tube axis direction of the electrode having translucency was prototyped, and the illuminance was measured. . Here, the aperture ratio refers to the area of the opening per electrode unit area including the opening, the area of the opening per electrode unit area is Sh, and the unit area of the electrode including the opening is unit area. Is represented by the following equation. Opening ratio = (Sh / Se) × 100% By utilizing this phenomenon, for example, by increasing the opening ratio at the center of the external electrode type fluorescent lamp from near the end,
The illuminance at the end of the lamp can be increased from the center.
【０００６】 単位面積当たりの開口数を変化させる 図３は同じ外部電極型蛍光ランプを用いて、電極の開口
率が一定となるようにして、電極全体の穴の数（開口部
の数）を変えたときの照度の変化を示す図であり、同図
は電極幅８ｍｍ、開口率５０％のランプを用いた場合を
示している。図３から明らかなように、電極の穴の数
（開口数）を変えたとき、外部電極型蛍光ランプの照度
が変化する。したがって、この現象を利用することによ
り、ランプの管軸方向の空間的配光を変化させることが
できる。例えば外部電極型蛍光ランプの電極の透光性部
分の開口率を一定とし、ランプ中央部付近の単位面積当
たりの開口数を端部付近より減らすことにより端部の照
度を中央部よりアップすることができる。FIG. 3 shows that the number of holes (the number of openings) of the entire electrode is changed by using the same external electrode type fluorescent lamp and keeping the aperture ratio of the electrode constant. It is a figure which shows the change of the illuminance at the time of changing, The figure has shown the case where the electrode width is 8 mm and the lamp of 50% of an aperture ratio is used. As is apparent from FIG. 3, when the number of holes (numerical aperture) of the electrodes is changed, the illuminance of the external electrode type fluorescent lamp changes. Therefore, by utilizing this phenomenon, the spatial light distribution in the tube axis direction of the lamp can be changed. For example, by keeping the aperture ratio of the light-transmitting portion of the electrode of the external electrode type fluorescent lamp constant, and decreasing the numerical aperture per unit area near the center of the lamp from the vicinity of the end to increase the illuminance at the end from the center. Can be.
【０００７】 単位面積当たりの開口数とともに開口
率を変化させる 単位面積当たりの開口数を変えると上記のように照度が
変わり、また、開口率を変化させることにより照度が変
わるので、これらを組み合わせ、管軸方向の開口数を変
えるとともに、開口率を変えることにより、さらに顕著
に管軸方向の照度を変化させることができる。Changing the numerical aperture along with the numerical aperture per unit area Changing the numerical aperture per unit area changes the illuminance as described above, and changing the numerical aperture changes the illuminance. By changing the numerical aperture in the tube axis direction and changing the aperture ratio, the illuminance in the tube axis direction can be more significantly changed.
【０００８】 反射材の利用 本発明者等は、先に提案した特願平７−３１３７０４号
において、電極の一部に反射材を配設することにより、
ランプの光を効率よくアパーチャから取り出せることを
示した。その後、本発明者等は、先に提案した特願平８
−１０９１０９号において、電極の一部を透光性とし、
この透光性を有する部分に反射材を設けることでさらに
外部電極型蛍光ランプの光出力を増大させることができ
ることを明らかにした。すなわち、上記で使用したラ
ンプにおいて電極に反射材を塗布すると、図２の点線に
示すように反射材なしの場合に比べ照度が増大する。こ
の現象と上記〜に示した現象を組み合わせることに
より、一層顕著にランプの管軸方向の照度を変化させる
ことができる。例えば、上記のように電極の管軸方向
で開口率を変えたランプにおいて、開口率の少ない部分
に反射材を設けることで、上記と同様に顕著に空間的な
照度変化を作ることができる。[0008] The present inventors have proposed in Japanese Patent Application No. 7-313704 previously proposed that a reflective material is provided on a part of an electrode.
It was shown that the light of the lamp can be efficiently extracted from the aperture. After that, the present inventors have proposed Japanese Patent Application No.
In -109109, a part of the electrode is made translucent,
It has been clarified that the light output of the external electrode type fluorescent lamp can be further increased by providing a reflecting material in the light transmitting portion. That is, when a reflective material is applied to the electrode in the lamp used above, the illuminance is increased as compared with the case without the reflective material as shown by the dotted line in FIG. By combining this phenomenon with the above-described phenomena, the illuminance in the tube axis direction of the lamp can be more remarkably changed. For example, in a lamp in which the aperture ratio is changed in the tube axis direction of the electrode as described above, by providing a reflective material in a portion having a small aperture ratio, a remarkable spatial illuminance change can be produced as described above.
【０００９】また、例えば、上記のように単位面積当
たりの開口数を変化させたランプにおいて、開口数の少
ない部分には反射材を設けず、開口数の多い部分のみに
反射材を設けることで、反射材を設けた部分の照度を一
層増大させることができ、顕著に空間的な照度変化を作
ることができる。さらに、上記のように開口数と開口
率を変化させたランプにおいて、開口率の少ない部分の
開口数を増やし、さらにその部分に反射材を設けること
でより顕著な空間的な照度の変化を作ることができる。Further, for example, in a lamp in which the numerical aperture per unit area is changed as described above, a reflective material is not provided in a portion having a small numerical aperture, and a reflective material is provided only in a portion having a large numerical aperture. In addition, the illuminance of the portion provided with the reflection material can be further increased, and a remarkable spatial illuminance change can be produced. Further, in the lamp having a changed numerical aperture and numerical aperture as described above, a more remarkable spatial illuminance change is produced by increasing the numerical aperture of a part having a small numerical aperture and further providing a reflective material in that part. be able to.
【００１０】以上のように、本発明の請求項１〜５の発
明は、電極の透光性部分の開口率、単位面積当たりの開
口数を変えることにより、従来のようにアパーチャの形
状を変えることなく外部電極型蛍光ランプ内での空間的
な照度変化を自由に形成できるようにしたものであり、
例えば、ランプの端部の照度を中央部に対して増大させ
たり低下させることができる。また、前記開口率、単位
面積当たりの開口数を管軸方向の特定部分のみ変化さ
せ、特定部分の照度を変化させたり、あるいは、開口
率、単位面積当たりの開口数を管軸方向でリニアに変化
させ、徐々に管軸方向の配光を変化させることもでき
る。As described above, according to the first to fifth aspects of the present invention, the aperture shape is changed as in the prior art by changing the aperture ratio of the translucent portion of the electrode and the numerical aperture per unit area. It is possible to freely form spatial illuminance change in the external electrode type fluorescent lamp without
For example, the illuminance at the end of the lamp can be increased or decreased with respect to the center. Further, the aperture ratio, the numerical aperture per unit area is changed only in a specific portion in the tube axis direction, or the illuminance of the specific portion is changed, or, the aperture ratio, the numerical aperture per unit area is linear in the tube axis direction. It is also possible to gradually change the light distribution in the tube axis direction.
【００１１】本発明を利用したランプでは、上記のよう
にランプ端部の照度を中央部に比べて高くすることがで
きるので、例えば原稿照明用のランプとして利用するの
に好適である。すなわち、原稿照明に利用される光源の
中でも縮小光学系を利用する場合、レンズを通過した光
は、レンズ中央部よりレンズ周辺部では、コサイン４乗
則により急激に減衰する。従来の外部電極型蛍光ランプ
においては、ランプ端部の照度を上げることは困難であ
り、ランプとレンズの光路間にシェーディング板を挿入
してランプ中央部の光を落として、見かけ上のランプ両
端の照度を上げて、レンズ通過後配光がフラットになる
ようにしていた。Since the illuminance at the end of the lamp can be made higher than that at the center of the lamp as described above, the lamp using the present invention is suitable for use as, for example, a lamp for illuminating a document. That is, when a reduction optical system is used among the light sources used for document illumination, light passing through the lens is rapidly attenuated from the center of the lens to the periphery of the lens according to the cosine fourth law. In conventional external electrode type fluorescent lamps, it is difficult to increase the illuminance at the end of the lamp, and a shading plate is inserted between the lamp and the optical path of the lens to reduce the light at the center of the lamp. Was increased so that the light distribution became flat after passing through the lens.
【００１２】これは、せっかくのランプの光を無駄にし
ていると同時に、イメージリーダや複写機にシェーディ
ング板という余計な部材を増やすこととなり、コストア
ップの要因にもなる。これに対し本発明を利用したラン
プにおいては、上記のようなシェーディング板が不要と
なり、ランプの光利用率もアップすることができる。ま
た、本発明のランプにおいては、導電性ペースト等を印
刷することにより、開口数、開口率を任意に変えて電極
を形成することができ、その製造が容易である。また、
反射材を設ける場合であっても、従来技術を利用して、
上記のように印刷するか、ディッピングすることで容易
に配設することができる。This wastes the light of the lamps and increases the number of extra members such as shading plates in the image reader and the copying machine, which also increases the cost. On the other hand, in the lamp using the present invention, the above-mentioned shading plate becomes unnecessary, and the light utilization rate of the lamp can be increased. Further, in the lamp of the present invention, by printing a conductive paste or the like, an electrode can be formed with an arbitrary numerical aperture and numerical aperture, and the manufacture thereof is easy. Also,
Even when providing a reflective material, using the conventional technology,
It can be easily arranged by printing or dipping as described above.
【００１３】[0013]
【発明の実施の形態】図１は本発明の外部電極型蛍光ラ
ンプの一実施例を示す図であり、同図（ａ）はその斜視
図を示し、（ｂ）は同図（ａ）に示す外部電極型蛍光ラ
ンプの管軸に垂直な断面図（Ａ−Ａ断面図）、また、
（ｃ）（ｄ）は中央部と端部の電極の詳細を示してい
る。外部電極型蛍光ランプ１０は同図（ａ）（ｂ）に示
すように、ガラス管１の外面に帯状の一対の外部電極
２，２’を配設し、ガラス管の内部に希ガスを封入する
ともに、ガラス管１の内面に蛍光物質３を塗布したもの
であり、上記外部電極２，２’に給電線５を介して連続
的な高周波電圧やパルス状電圧を印加する。これによ
り、上記外部電極２，２’に挟まれたガラス管１の内部
の放電空間に放電が発生し、この放電で発生した紫外線
によりガラス管１の内面に塗布された蛍光物質３が発光
する。FIG. 1 is a view showing an embodiment of an external electrode type fluorescent lamp according to the present invention. FIG. 1 (a) is a perspective view thereof, and FIG. 1 (b) is a view thereof. Sectional view (AA sectional view) perpendicular to the tube axis of the external electrode type fluorescent lamp shown in FIG.
(C) and (d) show the details of the center and end electrodes. As shown in FIGS. 1A and 1B, the external electrode type fluorescent lamp 10 has a pair of band-shaped external electrodes 2 and 2 'arranged on the outer surface of a glass tube 1 and a rare gas is sealed inside the glass tube. At the same time, the fluorescent material 3 is applied to the inner surface of the glass tube 1, and a continuous high-frequency voltage or a pulse-like voltage is applied to the external electrodes 2 and 2 ′ via the power supply line 5. As a result, a discharge is generated in a discharge space inside the glass tube 1 sandwiched between the external electrodes 2 and 2 ′, and the fluorescent substance 3 applied to the inner surface of the glass tube 1 emits light by the ultraviolet light generated by the discharge. .
【００１４】上記放電により生ずる光はアパーチャ４お
よびその対向面から外部に放射され、アパーチャ４から
放射される光が被照射体に照射される。上記した外部電
極型蛍光ランプ１０において、本実施例においては、図
１（ｃ）（ｄ）に示すように電極２．２’に複数の開口
部２ａ，２ｂを有した透光性部分を設け、該透光性部分
の開口部２ａ，２ｂを電極中央部と電極端部で異なった
形状とした。すなわち、電極の中央部では同図（ｃ）に
示すように、開口率を６０％にして矩形状の孔を１２個
／cm2 設け、電極の端部では同図（ｂ）に示すように、
中央部と同じ開口率６０％にして、矩形状の孔を３６個
／cm2 設けた。The light generated by the discharge is radiated to the outside from the aperture 4 and the opposing surface, and the light radiated from the aperture 4 is radiated to the irradiation object. In the above-described external electrode type fluorescent lamp 10, in this embodiment, as shown in FIGS. 1C and 1D, a light-transmitting portion having a plurality of openings 2a and 2b is provided in the electrode 2.2 '. The openings 2a and 2b of the light-transmitting portion have different shapes at the center of the electrode and at the end of the electrode. That is, at the center of the electrode, as shown in FIG. 3C, an aperture ratio of 60% is provided to form 12 rectangular holes / cm 2 , and at the end of the electrode, as shown in FIG. ,
The opening ratio was set to 60%, which was the same as that of the central portion, and 36 rectangular holes / cm 2 were provided.
【００１５】図４は上記外部電極型蛍光ランプ１０の電
極部分に反射材６を塗布した場合の構成を示す図であ
り、同図はランプの管軸に垂直な断面の一部を示してい
る。同図に示すように反射材６を例えば導電性ペースト
等から形成される電極２上に塗布することにより、反射
材６を塗布した部分の光出力を増大させることができ
る。反射材６としては、例えば酸化アルミニウムに結合
材を加えて電極部分に薄膜状に塗布し乾燥させたものを
使用することができ、また、上記酸化アルミニウムの代
わりに、硫酸バリウム、酸化マグネシウム、酸化チタ
ン、ピロリン酸カルシウム等を使用することができる。
さらに、上記材料に限らず、電気的絶縁性を有する材料
からできている白色や銀色等の反射テープを使用するこ
ともできる。なお、反射材６の取り付け態様としては、
図４に示すように電極上に塗布する代わりに、前記特願
平８−１０９１０９号に示したように、電極に設けた開
口部の部分のみに反射材６を塗布したり、反射材６を電
極から少し離して取り付け、反射材６による反射光を開
口部２ａ，２ｂを介してガラス管内部に戻すようにして
も同様の効果を得ることが可能である。FIG. 4 is a diagram showing a configuration in which a reflecting material 6 is applied to the electrode portion of the external electrode type fluorescent lamp 10, and FIG. 4 shows a part of a cross section perpendicular to the tube axis of the lamp. . As shown in the drawing, by applying the reflecting material 6 on the electrode 2 formed of, for example, a conductive paste, the light output of the portion where the reflecting material 6 is applied can be increased. As the reflecting material 6, for example, a material obtained by adding a binder to aluminum oxide, applying a thin film on an electrode portion, and drying the electrode can be used. In place of the aluminum oxide, barium sulfate, magnesium oxide, oxide Titanium, calcium pyrophosphate and the like can be used.
Furthermore, not limited to the above materials, a reflective tape of white or silver, which is made of a material having electrical insulation, can be used. In addition, as a mounting mode of the reflection material 6,
Instead of coating on the electrode as shown in FIG. 4, as shown in the above-mentioned Japanese Patent Application No. 8-109109, the reflecting material 6 is applied only to the opening portion provided in the electrode, or the reflecting material 6 is applied. The same effect can be obtained by mounting the device slightly away from the electrode and returning the light reflected by the reflector 6 to the inside of the glass tube via the openings 2a and 2b.
【００１６】上記図１に示した外部電極型蛍光ランプ、
および、図１のランプに図４に示すように反射材を塗布
したランプを使用し、透光部分の単位面積当たりの開口
数および開口率を変えて、配光特性を調べた。上記実験
において使用したランプは、φ８ｍｍ、ガラス厚み０．
５５ｍｍの鉛ガラスからなり、電極として、銀を主成分
とする導電性ペーストを印刷したものを使用した。封入
ガスはキセノン（Ｘｅ）、ネオン（Ｎｅ）２０％の混合
ガスを１５９６０Ｐａ（１２０Ｔｏｒｒ）封入した。The external electrode type fluorescent lamp shown in FIG.
Further, a light distribution characteristic was examined by using a lamp in which a reflecting material was applied to the lamp of FIG. 1 as shown in FIG. 4 and changing the numerical aperture and the numerical aperture per unit area of the light transmitting portion. The lamp used in the above experiment had a diameter of φ8 mm and a glass thickness of 0.1 mm.
An electrode made of a lead glass of 55 mm and printed with a conductive paste containing silver as a main component was used as an electrode. As a filling gas, a mixed gas of 20% xenon (Xe) and neon (Ne) was filled at 15960 Pa (120 Torr).
【００１７】（１）実施例１ ランプ全長が３７２ｍｍ、有効発光長が３５２ｍｍのラ
ンプを使用し、図５に示すように端部から７０ｍｍの両
端部は、開口率２５％とし、中央部は開口率８０％にな
るようにした。このランプを反射材を設けずに、２４Ｖ
１６Ｗの条件で点灯したときの管軸方向の配光特性を調
べたところ、図５（ａ）の特性が得られた。また、上記
ランプの端部から７０ｍｍの両端部の電極部分に反射材
を塗布したときの配光特性を調べたところ、図５（ｂ）
の特性が得られた。なお、同図において、横軸はランプ
管軸方向の位置を示し、縦軸は反射材を配設しない場合
におけるランプ中央部付近のランプ中央部付近の照度を
１００としたときの相対照度を示している。なお、ラン
プ中央部付近の照度が図５（ｂ）で（ａ）より増加して
いるが、これは本発明のランプが拡散光源であることに
起因する。(1) Example 1 A lamp having a total lamp length of 372 mm and an effective light emission length of 352 mm was used. As shown in FIG. 5, both ends 70 mm from the end had an aperture ratio of 25%, and the center had an opening. Rate was set to 80%. This lamp is provided with 24V
When the light distribution characteristics in the tube axis direction when the light was turned on under the condition of 16 W were examined, the characteristics shown in FIG. 5A were obtained. Further, when the light distribution characteristics when the reflective material was applied to the electrode portions at both ends 70 mm from the end of the lamp were examined, FIG. 5 (b)
Was obtained. In the figure, the abscissa indicates the position in the lamp tube axis direction, and the ordinate indicates the relative illuminance when the illuminance near the lamp center near the lamp center is 100 when no reflector is provided. ing. The illuminance near the center of the lamp is higher than that in (a) in FIG. 5B, but this is because the lamp of the present invention is a diffusion light source.
【００１８】（２）実施例２ ランプ全長が３７２ｍｍ、有効発光長が３５２ｍｍのラ
ンプを使用し、図１に示したように、透光部分の開口率
を６０％とし、ランプの端部から７０ｍｍの両端部は同
じ開口率６０％で開口数を３６個／cm2 とし、中央部は
開口数が１２個／cm2 となるようにした。このランプを
反射材を設けずに実施例１と同一の条件で点灯したとき
の管軸方向の配光特性を調べたところ、図６（ａ）の特
性が得られた。また、上記ランプの端部から７０ｍｍの
両端部の電極部分に前記図４に示したように反射材を塗
布したときの配光特性を調べたところ、図６（ｂ）の特
性が得られた。(2) Example 2 A lamp having a total length of 372 mm and an effective emission length of 352 mm was used. As shown in FIG. 1, the aperture ratio of the light-transmitting portion was 60%, and 70 mm from the end of the lamp. The both ends were made to have a numerical aperture of 36 / cm 2 at the same aperture ratio of 60%, and the central part was made to have a numerical aperture of 12 / cm 2 . When the light distribution characteristics in the tube axis direction when this lamp was lit under the same conditions as in Example 1 without providing a reflector, the characteristics shown in FIG. 6A were obtained. Further, when the light distribution characteristics when the reflecting material was applied to the electrode portions at both ends 70 mm from the end of the lamp as shown in FIG. 4 were examined, the characteristics shown in FIG. 6B were obtained. .
【００１９】（３）実施例３ ランプ全長が３７２ｍｍ、有効発光長が３５２ｍｍのラ
ンプを使用し、図７に示すように、ランプ中央部の７０
ｍｍの部分は、開口率６０％で開口数を３６個／cm2 と
して、また、残りの部分は、開口率６０％で開口数１２
個／cm2 とした。このランプを反射材を設けずに、２４
Ｖ１６Ｗの条件で点灯したときの管軸方向の配光特性を
調べたところ、図７の特性が得られた。なお、同図にお
いて、縦軸はランプ中央部以外の部分の照度を１００と
したときの相対照度を示している。(3) Example 3 A lamp having a total lamp length of 372 mm and an effective light emission length of 352 mm was used. As shown in FIG.
The mm part has a numerical aperture of 36 / cm 2 at a numerical aperture of 60%, and the remaining part has a numerical aperture of 12 at a numerical aperture of 60%.
Pieces / cm 2 . This lamp can be used without reflecting material.
When the light distribution characteristics in the tube axis direction when the lamp was turned on under the condition of V16W were examined, the characteristics shown in FIG. 7 were obtained. In the figure, the vertical axis indicates the relative illuminance when the illuminance of the portion other than the central portion of the lamp is set to 100.
【００２０】（４）実施例４ ランプ全長が３７２ｍｍ、有効発光長が３５２ｍｍのラ
ンプを使用し、図８に示すように端部から７０ｍｍの両
端部は、開口率６０％で開口数を３６個／cm2とし、中
央部は開口率８０％で開口数を約２８個／cm2 になるよ
うにした。このランプを反射材を設けずに、２４Ｖ１６
Ｗの条件で点灯したときの管軸方向の配光特性を調べた
ところ、図８（ａ）の特性が得られた。また、上記ラン
プの端部から７０ｍｍの両端部の部分に反射材を塗布し
たときの配光特性を調べたところ、図８（ｂ）の特性が
得られた。(4) Example 4 A lamp having a total length of 372 mm and an effective emission length of 352 mm is used. As shown in FIG. 8, both ends 70 mm from the end have a numerical aperture of 36% and a numerical aperture of 36. / Cm 2 , and the central portion was designed to have an aperture ratio of 80% and a numerical aperture of about 28 / cm 2 . This lamp is provided with a 24V16
When the light distribution characteristics in the tube axis direction when the light was turned on under the condition of W were examined, the characteristics shown in FIG. 8A were obtained. Further, when the light distribution characteristics when a reflective material was applied to both ends 70 mm from the end of the lamp were examined, the characteristics shown in FIG. 8B were obtained.
【００２１】上記実験結果から明らかなように、ランプ
管軸方向の透光性部分の開口率、単位面積当たりの開口
数を変えることにより、外部電極型蛍光ランプの管軸方
向の空間的な配光特性を自由に形成することができる。
また、電極部分に反射材を塗布することにより、一層顕
著に空間的な照度変化を作ることができる。なお、上記
実施例では、電極部分に矩形状の開口部を設ける場合に
ついて示したが、電極の透光性部分は上記実施例に限定
されるものではなく、前記したように、網状体で形成し
たり、丸形、楕円形、あるいは菱形等の多孔体等から形
成しても同様な効果を得ることができる。さらに、例え
ば図９に示すように電極部分にスリットを形成しても同
様な効果が得られる。As is clear from the above experimental results, the spatial distribution of the external electrode type fluorescent lamp in the tube axis direction can be changed by changing the aperture ratio of the translucent portion in the lamp tube axis direction and the numerical aperture per unit area. Optical characteristics can be freely formed.
Further, by applying a reflective material to the electrode portion, a more remarkable spatial illuminance change can be produced. Note that, in the above embodiment, the case where a rectangular opening is provided in the electrode portion has been described. However, the light-transmitting portion of the electrode is not limited to the above embodiment, and is formed of a mesh as described above. The same effect can be obtained by forming the sheet from a porous body such as a round, oval, or rhombus. Further, a similar effect can be obtained by forming a slit in the electrode portion as shown in FIG. 9, for example.
【００２２】すなわち、図９（ａ）（ｂ）に示すよう
に、電極部分に管軸方向にスリット状の開口部を設け、
該スリットの幅を管軸方向で変化させれば、管軸方向の
透光性部分の開口率が変わるので、前記したのと同様、
管軸方向の空間的配光特性を変えることができる。ま
た、スリットを管軸に直交する方向に設け、該スリット
の幅を管軸方向で変化させることにより同様の効果を得
ることができる。さらに、図１０（ａ）に示すように、
管軸方向に矩形波状に沿ってジグザク状に電極を配設し
ても、管軸方向の空間的配光特性を変えることができ
る。図１０（ｂ）は、図１０（ａ）の部分拡大図であ
り、この場合、開口部は電極領域Ｌの範囲内で、電極に
よって囲まれた部分が開口として機能する。That is, as shown in FIGS. 9A and 9B, a slit-shaped opening is provided in the electrode portion in the tube axis direction.
If the width of the slit is changed in the tube axis direction, the aperture ratio of the light-transmitting portion in the tube axis direction changes.
The spatial light distribution characteristics in the tube axis direction can be changed. A similar effect can be obtained by providing a slit in a direction perpendicular to the tube axis and changing the width of the slit in the tube axis direction. Further, as shown in FIG.
Even if the electrodes are arranged in a zigzag shape along a rectangular wave shape in the tube axis direction, the spatial light distribution characteristics in the tube axis direction can be changed. FIG. 10B is a partially enlarged view of FIG. 10A. In this case, the opening portion functions as an opening in the range of the electrode region L and the portion surrounded by the electrode.
【００２３】[0023]
【発明の効果】以上説明したように、本発明において
は、ガラス管内部に希ガスを所定量封入密閉し、該ガラ
ス管内部に蛍光体物質を塗布し、該ガラス管外面の管軸
方向に少なくとも一対の電極を配設するともに、外部に
光を放出するアパーチャを設け、上記電極の少なくとも
一部が透光性を有している外部電極型蛍光ランプにおい
て、上記電極の透光性部分を網状体または多孔体から形
成し、透光性部分の管軸方向の開口率もしくは単位面積
当たりの開口数を変化させたり、電極部分に部分的に反
射材を塗布するようにしたので、以下の効果を得ること
ができる。 （１）外部電極型蛍光ランプにおいて、従来のようにア
パーチャの形状を変えることなく管軸方向の空間的照度
変化を自由に形成することができる。このため、例え
ば、原稿照明に利用される光源において縮小光学系を利
用する場合に生ずるレンズ周辺部での光量が急激に減少
するといった問題を、シェーディング板等を使用するこ
となく、容易に解消することができる。As described above, in the present invention, a predetermined amount of a rare gas is sealed in the inside of a glass tube, and a phosphor substance is applied to the inside of the glass tube. At least a pair of electrodes are provided, and an aperture for emitting light to the outside is provided, and in a fluorescent lamp of an external electrode type in which at least a part of the electrodes has translucency, a translucent portion of the electrodes is disposed. Since it was formed from a mesh or porous body, the aperture ratio of the translucent portion in the tube axis direction or the number of apertures per unit area was changed, or the reflective material was partially applied to the electrode portion. The effect can be obtained. (1) In the external electrode type fluorescent lamp, the spatial illuminance change in the tube axis direction can be freely formed without changing the shape of the aperture unlike the related art. For this reason, for example, the problem that the light amount at the periphery of the lens suddenly decreases when a reduction optical system is used in a light source used for document illumination can be easily solved without using a shading plate or the like. be able to.
【００２４】（２）外部電極型蛍光ランプの電極は、導
電性ペースト等を印刷することにより形成することがで
きるので、管軸方向の開口率、単位面積当たりの開口数
を変えた電極を容易に形成することができ、また、反射
材も、印刷やディッピングすることで容易に配設するこ
とができる。このため、本発明の外部電極型蛍光ランプ
を容易に製造することができる。(2) Since the electrodes of the external electrode type fluorescent lamp can be formed by printing a conductive paste or the like, it is easy to change the aperture ratio in the tube axis direction and the number of apertures per unit area. The reflecting material can be easily provided by printing or dipping. For this reason, the external electrode type fluorescent lamp of the present invention can be easily manufactured.
【図１】本発明の実施例の外部電極型蛍光ランプの構成
を示す図である。FIG. 1 is a diagram showing a configuration of an external electrode type fluorescent lamp according to an embodiment of the present invention.
【図２】電極の開口率と照度との関係を示す図である。FIG. 2 is a diagram showing a relationship between an aperture ratio of an electrode and illuminance.
【図３】電極全体に設けた穴の数と照度との関係を示す
図である。FIG. 3 is a diagram showing the relationship between the number of holes provided in the entire electrode and the illuminance.
【図４】本発明の実施例において反射材を設けた場合の
構成を示す図である。FIG. 4 is a diagram showing a configuration when a reflective material is provided in the embodiment of the present invention.
【図５】本発明の実施例（１）における管軸方向の照度
変化を示す図である。FIG. 5 is a diagram showing a change in illuminance in the tube axis direction in the embodiment (1) of the present invention.
【図６】本発明の実施例（２）における管軸方向の照度
変化を示す図である。FIG. 6 is a diagram showing a change in illuminance in the tube axis direction in the embodiment (2) of the present invention.
【図７】本発明の実施例（３）における管軸方向の照度
変化を示す図である。FIG. 7 is a diagram showing a change in illuminance in the tube axis direction in Example (3) of the present invention.
【図８】本発明の実施例（４）における管軸方向の照度
変化を示す図である。FIG. 8 is a diagram showing a change in illuminance in a tube axis direction in the embodiment (4) of the present invention.
【図９】管軸方向にスリット状の開口部を設けた場合の
構成例を示す図である。FIG. 9 is a diagram showing a configuration example in the case where a slit-shaped opening is provided in the tube axis direction.
【図１０】管軸方向に電極領域幅に矩形波形状に沿って
ジグザクに電極を配設した場合の電極形状を示す図であ
る。FIG. 10 is a view showing an electrode shape when electrodes are arranged in a zigzag manner along a rectangular wave shape in an electrode region width in a tube axis direction.
１ ガラス管 ２，２’ 外部電極 ３ 蛍光物質 ５ 給電線 ４ アパーチャ １０ 外部電極型蛍光ランプ ２ａ，２ｂ 開口部 ６ 反射材 DESCRIPTION OF SYMBOLS 1 Glass tube 2, 2 'External electrode 3 Fluorescent substance 5 Power supply line 4 Aperture 10 External electrode type fluorescent lamp 2a, 2b Opening 6 Reflector
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１０年７月１６日[Submission date] July 16, 1998
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Correction target item name] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【特許請求の範囲】[Claims]
【手続補正２】[Procedure amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１０[Correction target item name] 0010
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【００１０】以上のように、本発明の請求項１〜６の発
明は、電極の透光性部分の開口率や開口幅、単位面積当
たりの開口数を変えることにより、従来のようにアパー
チャの形状を変えることなく外部電極型蛍光ランプ内で
の空間的な照度変化を自由に形成できるようにしたもの
であり、例えば、ランプの端部の照度を中央部に対して
増大させたり低下させることができる。また、前記開口
率、単位面積当たりの開口数を管軸方向の特定部分のみ
変化させ、特定部分の照度を変化させたり、あるいは、
開口率、単位面積当たりの開口数を管軸方向でリニアに
変化させ、徐々に管軸方向の配光を変化させることもで
きる。As described above, according to the first to sixth aspects of the present invention, the aperture ratio , the aperture width , and the numerical aperture per unit area of the light-transmitting portion of the electrode are changed, so that This allows the spatial illuminance change in the external electrode type fluorescent lamp to be freely formed without changing the shape.For example, it is possible to increase or decrease the illuminance at the end of the lamp with respect to the center. Can be. Further, the aperture ratio, changing the numerical aperture per unit area only a specific portion in the tube axis direction, or changing the illuminance of the specific portion, or,
The aperture ratio and the numerical aperture per unit area can be linearly changed in the tube axis direction, and the light distribution in the tube axis direction can be gradually changed.
Claims (5)
し、該ガラス管内部に蛍光体物質を塗布し、該ガラス管
外面の管軸方向に少なくとも一対の電極を配設するとも
に、外部に光を放出するアパーチャを設け、上記電極の
少なくとも一部が透光性を有している外部電極型蛍光ラ
ンプであって、 上記電極の透光性部分が網状体または多孔体からなり、
上記電極の透光性部分の管軸方向の開口率を変化させて
なることを特徴とする外部電極型蛍光ランプ。1. A predetermined amount of a rare gas is sealed and sealed in a glass tube, a fluorescent substance is applied to the inside of the glass tube, and at least a pair of electrodes are arranged in a tube axis direction on an outer surface of the glass tube. An external electrode type fluorescent lamp in which an aperture that emits light is provided, wherein at least a part of the electrode has translucency, wherein the translucent portion of the electrode is formed of a mesh or a porous body,
An external electrode type fluorescent lamp, characterized in that the aperture ratio of the translucent portion of the electrode in the tube axis direction is changed.
し、該ガラス管内部に蛍光体物質を塗布し、該ガラス管
外面の管軸方向に少なくとも一対の電極を配設するとも
に、外部に光を放出するアパーチャを設け、上記電極の
少なくとも一部が透光性を有している外部電極型蛍光ラ
ンプであって、 上記電極の透光性部分が網状体または多孔体からなり、
上記電極の透光性部分の管軸方向の開口率を一定とし、
単位面積当たりの開口数を管軸方向で変化させてなるこ
とを特徴とする外部電極型蛍光ランプ。2. A predetermined amount of a rare gas is sealed and sealed in a glass tube, a fluorescent substance is applied to the inside of the glass tube, and at least a pair of electrodes are arranged in a tube axis direction on an outer surface of the glass tube. An external electrode type fluorescent lamp in which an aperture that emits light is provided, wherein at least a part of the electrode has translucency, wherein the translucent portion of the electrode is formed of a mesh or a porous body,
The aperture ratio in the tube axis direction of the translucent portion of the electrode is constant,
An external electrode type fluorescent lamp characterized in that the numerical aperture per unit area is changed in the tube axis direction.
し、該ガラス管内部に蛍光体物質を塗布し、該ガラス管
外面の管軸方向に少なくとも一対の電極を配設するとも
に、外部に光を放出するアパーチャを設け、上記電極の
少なくとも一部が透光性を有している外部電極型蛍光ラ
ンプであって、 上記電極の透光性部分が網状体または多孔体からなり、
上記電極の透光性部分の管軸方向の開口率および単位面
積当たりの開口数を管軸方向で変化させてなることを特
徴とする外部電極型蛍光ランプ。3. A predetermined amount of a rare gas is sealed and sealed in a glass tube, a fluorescent substance is applied to the inside of the glass tube, and at least a pair of electrodes are arranged in a tube axis direction on an outer surface of the glass tube. An external electrode type fluorescent lamp in which an aperture that emits light is provided, wherein at least a part of the electrode has translucency, wherein the translucent portion of the electrode is formed of a mesh or a porous body,
An external electrode type fluorescent lamp characterized in that the aperture ratio of the translucent portion of the electrode in the tube axis direction and the numerical aperture per unit area are changed in the tube axis direction.
くとも一部に反射材を設けたことを特徴とする請求項
１，２または請求項３の外部電極型蛍光ランプ。4. The external electrode type fluorescent lamp according to claim 1, wherein a reflective material is provided on at least a part of the translucent portion of the electrode in the tube axis direction.
るアパーチャからの光量が中央部からの光量より多くな
るようにしたことを特徴とする請求項１，２，３または
請求項４の外部電極型蛍光ランプ。5. The external electrode according to claim 1, wherein the amount of light from the aperture near both ends in the tube axis direction of the lamp is larger than the amount of light from the center. Type fluorescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09082498A JP3137026B2 (en) | 1997-04-01 | 1997-04-01 | External electrode type fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09082498A JP3137026B2 (en) | 1997-04-01 | 1997-04-01 | External electrode type fluorescent lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10284008A true JPH10284008A (en) | 1998-10-23 |
| JP3137026B2 JP3137026B2 (en) | 2001-02-19 |
Family
ID=13776168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09082498A Expired - Lifetime JP3137026B2 (en) | 1997-04-01 | 1997-04-01 | External electrode type fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3137026B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001035445A1 (en) * | 1999-11-10 | 2001-05-17 | Harison Toshiba Lighting Corporation | Fluorescent lamp, discharge lamp and liquid crystal backlight device incorporating this |
| US6806648B2 (en) | 2001-11-22 | 2004-10-19 | Matsushita Electric Industrial Co., Ltd. | Light source device and liquid crystal display device |
| US6806647B2 (en) | 2001-09-19 | 2004-10-19 | Matsushita Electric Industrial Co., Ltd. | Light source device with discontinuous electrode contact portions and liquid crystal display |
| US6891334B2 (en) | 2001-09-19 | 2005-05-10 | Matsushita Electric Industrial Co., Ltd. | Light source device and liquid crystal display employing the same |
| US6906461B2 (en) | 2001-12-28 | 2005-06-14 | Matsushita Electric Industrial Co., Ltd. | Light source device with inner and outer electrodes and liquid crystal display device |
| US6946794B2 (en) | 2001-11-22 | 2005-09-20 | Matsushita Electric Industrial Co., Ltd. | Light source device and image reader |
| JP2006261098A (en) * | 2005-03-14 | 2006-09-28 | Lg Electronics Inc | Electrodeless lighting apparatus |
| JP2016186924A (en) * | 2015-03-27 | 2016-10-27 | 株式会社Ｇｓユアサ | Discharge lamp |
| CN110534400A (en) * | 2018-05-25 | 2019-12-03 | 优志旺电机株式会社 | Excimer lamp |
-
1997
- 1997-04-01 JP JP09082498A patent/JP3137026B2/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001035445A1 (en) * | 1999-11-10 | 2001-05-17 | Harison Toshiba Lighting Corporation | Fluorescent lamp, discharge lamp and liquid crystal backlight device incorporating this |
| US6727649B1 (en) | 1999-11-10 | 2004-04-27 | Harison Toshiba Lighting Corporation | Fluorescent lamp, discharge lamp and liquid crystal backlight device incorporating this |
| US6806647B2 (en) | 2001-09-19 | 2004-10-19 | Matsushita Electric Industrial Co., Ltd. | Light source device with discontinuous electrode contact portions and liquid crystal display |
| US6891334B2 (en) | 2001-09-19 | 2005-05-10 | Matsushita Electric Industrial Co., Ltd. | Light source device and liquid crystal display employing the same |
| US6946796B2 (en) | 2001-09-19 | 2005-09-20 | Matsushita Electric Industrial Co., Ltd. | Light source device and liquid crystal display employing the same |
| US6806648B2 (en) | 2001-11-22 | 2004-10-19 | Matsushita Electric Industrial Co., Ltd. | Light source device and liquid crystal display device |
| US6946794B2 (en) | 2001-11-22 | 2005-09-20 | Matsushita Electric Industrial Co., Ltd. | Light source device and image reader |
| US6906461B2 (en) | 2001-12-28 | 2005-06-14 | Matsushita Electric Industrial Co., Ltd. | Light source device with inner and outer electrodes and liquid crystal display device |
| JP2006261098A (en) * | 2005-03-14 | 2006-09-28 | Lg Electronics Inc | Electrodeless lighting apparatus |
| JP2016186924A (en) * | 2015-03-27 | 2016-10-27 | 株式会社Ｇｓユアサ | Discharge lamp |
| CN110534400A (en) * | 2018-05-25 | 2019-12-03 | 优志旺电机株式会社 | Excimer lamp |
| CN110534400B (en) * | 2018-05-25 | 2024-02-20 | 优志旺电机株式会社 | Excimer lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3137026B2 (en) | 2001-02-19 |
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