JP2007188649A - Cold cathode fluorescent tube and its manufacturing method - Google Patents
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- JP2007188649A JP2007188649A JP2006003268A JP2006003268A JP2007188649A JP 2007188649 A JP2007188649 A JP 2007188649A JP 2006003268 A JP2006003268 A JP 2006003268A JP 2006003268 A JP2006003268 A JP 2006003268A JP 2007188649 A JP2007188649 A JP 2007188649A
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本発明は、冷陰極蛍光管及びその製造方法に代わり、特に液晶表示パネル，計器用表示パネルまたはスキャナ等の照明装置の光源に用いて好適な冷陰極蛍光管及びその製造方法に係わり、特に冷陰極蛍光管のカップ状電極構造に関するものである。 The present invention relates to a cold cathode fluorescent tube suitable for use as a light source of an illuminating device such as a liquid crystal display panel, an instrument display panel or a scanner, in place of a cold cathode fluorescent tube and a method for manufacturing the same, and more particularly The present invention relates to a cup-shaped electrode structure of a cathode fluorescent tube.
各種の照明装置の中で低消費電力，高輝度あるいは小寸法の光源として放電管が多用されている。この放電管のうち、蛍光体を内壁に塗布したガラス等の透明絶縁材料からなる外套管内に不活性ガスと水銀を封入した低圧放電管は蛍光灯として広く知られている。この種の低圧放電管には熱電子を用いる熱陰極型と冷電子を用いる冷陰極型とがある。 Among various lighting devices, discharge tubes are frequently used as light sources with low power consumption, high luminance, or small dimensions. Among these discharge tubes, a low-pressure discharge tube in which an inert gas and mercury are enclosed in an outer tube made of a transparent insulating material such as glass with a phosphor coated on the inner wall is widely known as a fluorescent lamp. This type of low-pressure discharge tube includes a hot cathode type using thermoelectrons and a cold cathode type using cold electrons.
非発光型である例えば液晶表示パネルを用いた画像表示装置では、当該液晶表示パネルに形成された電子潜像を外部照明手段を設けることにより、可視化している。外部照明手段には自然光を利用する構造を除いて液晶表示パネルの背面または前面に照明装置を設置している。特に高輝度を要する表示デバイスには、液晶表示パネルの背面に照明装置を設けた構造が主流となっている。これをバックライトと称している。 In an image display device using, for example, a liquid crystal display panel that is a non-light-emitting type, an electronic latent image formed on the liquid crystal display panel is visualized by providing external illumination means. Except for the structure using natural light, the external illumination means is provided with an illumination device on the back or front of the liquid crystal display panel. Especially for display devices that require high brightness, a structure in which an illuminating device is provided on the back of a liquid crystal display panel has become the mainstream. This is called a backlight.
バックライトには、大別してサイドエッジ型と直下型とがある。サイドエッジ型は、透明板からなる導光板の側縁部に沿って冷陰極蛍光管に代表される線状光源を設置した構造であり、パソコン用等の薄型化が要求される表示デバイスに多く用いられている。一方、ディスプレィモニタまたはテレビ受像機に用いられる表示デバイス等の大型サイズの液晶表示装置では、直下型が多く用いられる。直下型バックライトは、液晶表示パネルの背面側直下に照明装置を設置する構造である。 There are two types of backlights: side edge type and direct type. The side-edge type is a structure in which a linear light source typified by a cold cathode fluorescent tube is installed along the side edge of a light guide plate made of a transparent plate. It is used. On the other hand, in a large-sized liquid crystal display device such as a display device used for a display monitor or a television receiver, a direct type is often used. The direct type backlight has a structure in which an illumination device is installed directly under the back side of the liquid crystal display panel.
例えば、液晶表示装置の照明装置の光源には、上記冷電子を放出して蛍光体を励起して発光させる冷陰極蛍光管（ＣＣＦＬ）が採用されている。一般に冷電子を放出する電極はニッケル等の金属材料が用いられる。 For example, a cold cathode fluorescent tube (CCFL) that emits cold electrons by exciting the phosphors to emit light is employed as the light source of the illumination device of the liquid crystal display device. Generally, a metal material such as nickel is used for an electrode that emits cold electrons.
冷陰極蛍光管のカップ状電極と電力導入線との接続手段として一般的に抵抗溶接法またはレーザ溶接法を用いて行なうが、溶接時には、少なからずカップ状電極の素材の酸化物がカップ状電極の内壁面に付着し、この酸化物は冷陰極蛍光管の点灯中に外套管内の電子及びイオン等がカップ状電極の内壁面に衝突し、叩かれ、カップ状電極内壁側からその電極開口近辺から外套管の内面に飛散し、スパッタ膜の発生の引き金となっている。 Generally, resistance welding or laser welding is used as a means for connecting the cold cathode fluorescent tube cup-shaped electrode and the power lead-in line, but at the time of welding, the oxide of the cup-shaped electrode material is not limited to the cup-shaped electrode. This oxide adheres to the inner wall of the cup-shaped electrode, and electrons and ions in the outer tube collide with the inner wall of the cup-shaped electrode while the cold-cathode fluorescent tube is lit. To the inner surface of the mantle tube, triggering the generation of a sputtered film.
さらに、冷陰極蛍光管の点灯時間が増加すると、この過程が進行し、カップ状電極の開口部近辺での電食及びカップ状電極の底辺部での電食が進み、特に後者が顕著となる。 Further, when the lighting time of the cold cathode fluorescent tube increases, this process proceeds, and electrolytic corrosion near the opening of the cup-shaped electrode and electrolytic bottom near the bottom of the cup-shaped electrode progresses, and the latter is particularly remarkable. .
また、カップ状電極の底辺部での電食は、カップ状電極を支持している導入線にまで達し、カップ状電極の底辺部の電極厚さが薄いと、カップ状電極が導入線から外れてしまうという課題があった。 In addition, the electrolytic corrosion at the bottom of the cup-shaped electrode reaches the lead-in line that supports the cup-shaped electrode, and if the electrode thickness at the bottom of the cup-shaped electrode is thin, the cup-shaped electrode is detached from the lead-in line. There was a problem that it would end up.
さらに、カップ状電極の材質は、一般にニッケル（Ｎｉ）が用いられているが、カップ状電極の電食に対してこの材質を高融点金属、例えばＷ（タングステン），Ｍｏ（モリブデン），Ｎｂ（ニオブ）等を用いる手段、またはカップ状電極をＮｉにより形成し、底辺部を厚肉で形成する手段等が提案されているが、高融点金属がコスト高であること，カップ形状への成形，溶接技術の困難性及び溶接部の信頼性等に種々の課題があった。 Further, nickel (Ni) is generally used as the material of the cup-shaped electrode, but this material is used as a refractory metal, such as W (tungsten), Mo (molybdenum), Nb (for the electrolytic corrosion of the cup-shaped electrode. Niobium) or the like, or a means in which the cup-shaped electrode is formed of Ni and the bottom is thick, etc. have been proposed. There were various problems in the difficulty of the welding technique and the reliability of the welded part.
したがって、本発明は、前述した従来の課題を解決するためになされたものであり、その目的は、カップ状電極の底辺部での電食に起因するカップ状電極の脱落防止し、低コストにて安定した放電を長時間に亘って維持できる冷陰極蛍光管及びその製造方法を提供することにある。 Accordingly, the present invention has been made to solve the above-described conventional problems, and its purpose is to prevent the cup-shaped electrode from falling off due to electrolytic corrosion at the bottom of the cup-shaped electrode, thereby reducing the cost. Another object of the present invention is to provide a cold cathode fluorescent tube capable of maintaining a stable and stable discharge for a long time and a method for manufacturing the same.
このような目的を達成するために本発明による冷陰極蛍光管は、内面に蛍光体膜が形成された透光性絶縁材料からなる外套管の放電領域側に開口端を有し、この開口端と反対側端に有する底部外壁に電力導入線を接合した一対のカップ状電極を外套管の両端内部に具備した冷陰極蛍光管であって、カップ状電極は、キャップ体と、このキャップ体の底部外壁に接合された円板と、この円板の外壁に接合された電力導入線とから構成することにより、カップ状電極の底部における見かけ上の底厚を厚くすることができるので、背景技術の課題を解決することができる。 In order to achieve such an object, the cold cathode fluorescent tube according to the present invention has an open end on the discharge region side of the outer tube made of a light-transmitting insulating material having a phosphor film formed on the inner surface. A cold cathode fluorescent tube having a pair of cup-shaped electrodes joined to the outer wall of the bottom at the opposite end to the inside of both ends of the outer tube, the cup-shaped electrode comprising a cap body and the cap body Since it is possible to increase the apparent bottom thickness of the bottom of the cup-shaped electrode by configuring the disk joined to the bottom outer wall and the power introduction line joined to the outer wall of the disk, the background art The problem can be solved.
本発明による冷陰極蛍光管は、好ましくは、上記構成において、キャップ体及び円板がニッケル材の成形体からなることを特徴とする。 The cold cathode fluorescent tube according to the present invention is preferably characterized in that, in the above-described configuration, the cap body and the disc are formed of a nickel body.
本発明による他の冷陰極蛍光管は、内面に蛍光体膜が形成された透光性絶縁材料からなる外套管の放電領域側に開口端を有し、この開口端と反対側端に有する底部外壁に電力導入線を接合した一対のカップ状電極を外套管の両端内部に具備した冷陰極蛍光管であって、カップ状電極は、第１のキャップ体と、この第１のキャップ体の底部外壁に接合された第１のキャップ体よりも内径が大きく且つ管長の短い第２のキャップ体と、この第２のキャップ体の底部外壁に接合された電力導入線とから構成することにより、カップ状電極の底部における見かけ上の底厚を厚くすることができるので、背景技術の課題を解決することができる。 Another cold cathode fluorescent tube according to the present invention has an open end on the discharge region side of the outer tube made of a translucent insulating material having a phosphor film formed on the inner surface, and a bottom portion on the opposite end to the open end. A cold cathode fluorescent tube having a pair of cup-shaped electrodes joined to the outer wall at both ends of the outer tube, wherein the cup-shaped electrode comprises a first cap body and a bottom portion of the first cap body. By comprising a second cap body having an inner diameter larger than that of the first cap body joined to the outer wall and having a short tube length, and a power introduction line joined to the bottom outer wall of the second cap body, Since the apparent bottom thickness at the bottom of the electrode can be increased, the problems of the background art can be solved.
本発明による冷陰極蛍光管は、好ましくは、上記構成において、第１のキャップ体及び第２のキャップ体がニッケル材の成形体からなることを特徴とする。 The cold cathode fluorescent tube according to the present invention is preferably characterized in that, in the above-described configuration, the first cap body and the second cap body are formed of a nickel material.
本発明による冷陰極蛍光管の製造方法は、内面に蛍光体膜が形成された透光性絶縁材料からなる外套管の放電領域側に開口端を有し、この開口端と反対側端に有する底部外壁に電力導入線を接合した一対のカップ状電極を外套管の両端内部に具備し、カップ状電極は、キャップ体と、このキャップ体の底部外壁に接合された円板と、この円板の外壁に接合された電力導入線とを有し、キャップ体の底部外壁に円板を当接し、当該円板の外壁側の方向から溶接し、円板の外壁に電力導入線を突き合わせて当該電力導入線側の方向から溶接することにより、カップ状電極の底部における見かけ上の底厚を厚くすることができる。 The manufacturing method of the cold cathode fluorescent tube according to the present invention has an open end on the discharge region side of the outer tube made of a translucent insulating material having a phosphor film formed on the inner surface, and has an open end opposite to the open end. A pair of cup-like electrodes having power introduction wires joined to the bottom outer wall are provided inside both ends of the outer tube, and the cup-like electrode comprises a cap body, a disc joined to the bottom outer wall of the cap body, and the disc A power introduction line joined to the outer wall of the cap body, a disk is brought into contact with the bottom outer wall of the cap body, welded from the direction of the outer wall side of the disk, and the power introduction line is abutted against the outer wall of the disk. By welding from the direction of the power introduction line, the apparent bottom thickness at the bottom of the cup-shaped electrode can be increased.
本発明による冷陰極蛍光管の製造方法は、好ましくは、上記構成において、キャップ体及び円板がニッケル材の成形体からなることを特徴とする。 The manufacturing method of a cold cathode fluorescent tube according to the present invention is preferably characterized in that, in the above configuration, the cap body and the disc are formed of a nickel body.
本発明による他の冷陰極蛍光管の製造方法は、内面に蛍光体膜が形成された透光性絶縁材料からなる外套管の放電領域側に開口端を有し、この開口端と反対側端に有する底部外壁に電力導入線を接合した一対のカップ状電極を外套管の両端内部に具備し、カップ状電極は、第１のキャップ体と、この第１のキャップ体の底部外壁に接合された第１のキャップ体よりも内径が大きく且つ管長の短い第２のキャップ体と、この第２のキャップ体の底部外壁に接合された電力導入線とを有し、第１のキャップ体の底部外壁に第２のキャップ体の底部内壁を当接し、第２のキャップ体の底部外壁側の方向から溶接し、第２のキャップ体の底部外壁に電力導入線を突き合わせて当該電力導入線側の方向から溶接することにより、カップ状電極の底部における見かけ上の底厚を厚くすることができる。 Another cold cathode fluorescent tube manufacturing method according to the present invention has an open end on the discharge region side of the outer tube made of a translucent insulating material having a phosphor film formed on the inner surface, and an end opposite to the open end. A pair of cup-like electrodes joined to the bottom outer wall of the outer tube at both ends of the outer tube, and the cup-like electrodes are joined to the first cap body and the bottom outer wall of the first cap body. A second cap body having an inner diameter larger than that of the first cap body and a short tube length, and a power introduction line joined to the bottom outer wall of the second cap body, and a bottom portion of the first cap body The bottom inner wall of the second cap body is brought into contact with the outer wall, welded from the direction of the bottom outer wall side of the second cap body, the power introduction line is abutted against the bottom outer wall of the second cap body, and the power introduction line side By welding from the direction, the bottom of the cup-shaped electrode Bottom thickness apparent can a thickening that.
本発明による冷陰極蛍光管の製造方法は、好ましくは、上記構成において、第１キャップ体及び第２のキャップ体がニッケル材の成形体からなることを特徴とする。 The manufacturing method of a cold cathode fluorescent tube according to the present invention is preferably characterized in that, in the above-described configuration, the first cap body and the second cap body are formed of a nickel body.
また、本発明による冷陰極蛍光管の製造方法は、好ましくは、上記構成において、溶接が抵抗溶接法またはレーザ溶接法を用いることを特徴としている。 Moreover, the method for manufacturing a cold cathode fluorescent tube according to the present invention is preferably characterized in that, in the above configuration, welding uses a resistance welding method or a laser welding method.
なお、本発明は、上記構成に限定されるものではなく、本発明の技術思想を逸脱することなく、種々の変更が可能である。 In addition, this invention is not limited to the said structure, A various change is possible without deviating from the technical idea of this invention.
本発明による冷陰極蛍光管によれば、カップ状電極の底部における底厚が見かけ上、厚くなるので、カップ状電極の底部での電食に起因するカップ状電極本体の脱落を確実に防止し、安定した放電を長時間に亘って維持できるので、品質及び信頼性の高い長寿命の冷陰極蛍光管が得られるという極めて優れた効果を有する。 According to the cold cathode fluorescent tube of the present invention, since the bottom thickness of the cup-shaped electrode is apparently thickened, it is possible to reliably prevent the cup-shaped electrode body from falling off due to electrolytic corrosion at the bottom of the cup-shaped electrode. Since a stable discharge can be maintained for a long time, it has an extremely excellent effect that a cold cathode fluorescent tube having a high quality and reliability and having a long life can be obtained.
また、本発明による冷陰極蛍光管の製造方法によれば、カップ状電極の組み立てが簡素化され、製作が簡単且つ容易となるので、カップ状電極のカップ形状への成形及び溶接技術の困難性が回避でき、溶接部の信頼性を向上できるので、低コストにて生産性の高い冷陰極蛍光管が得られるという極めて優れた効果を有する。 In addition, according to the method of manufacturing a cold cathode fluorescent tube according to the present invention, the assembly of the cup-shaped electrode is simplified, and the manufacture is simple and easy. Can be avoided, and the reliability of the welded portion can be improved, so that it is possible to obtain a highly productive cold cathode fluorescent tube at a low cost.
以下、本発明の具体的な実施の形態について、実施例の図面を参照して詳細に説明する。 Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings of the examples.
図１は、本発明による冷陰極蛍光管の実施例１による構成を示す要部拡大断面図であり、この図１では冷陰極蛍光管の一端部側を示してある。 FIG. 1 is an enlarged cross-sectional view of a main part showing the configuration of a cold cathode fluorescent tube according to a first embodiment of the present invention. FIG. 1 shows one end side of the cold cathode fluorescent tube.
図１において、この冷陰極蛍光管ＣＣＦＬは、外套管である透光性絶縁材料からなるガラス管ＶＡＬの両端内部には一対のカップ状電極ＥＬＥが対向して配設され、さらにガラス管ＶＡＬ内を真空引きした後に不活性ガスとしてネオン−アルゴン（Ｎｅ−Ａｒ）ガス及び水銀が封入されて構成されている。このガラス管ＶＡＬの内壁面には蛍光体膜ＦＬＵが被着形成されている。なお、この冷陰極蛍光管ＣＣＦＬは、そのガラス管ＶＡＬの肉厚が例えば数１００μｍ程度であり、外径が１．０ｍｍ〜１０．０ｍｍ程度で長さが５０ｍｍ〜８００ｍｍ程度の大きさで形成されている。 In FIG. 1, a cold cathode fluorescent tube CCFL is provided with a pair of cup-shaped electrodes ELE opposed to each other inside a glass tube VAL made of a light-transmitting insulating material, which is a mantle tube, and further inside the glass tube VAL. After being evacuated, neon-argon (Ne-Ar) gas and mercury are enclosed as an inert gas. A phosphor film FLU is deposited on the inner wall surface of the glass tube VAL. The cold cathode fluorescent tube CCFL has a glass tube VAL with a thickness of, for example, about several hundreds of micrometers, an outer diameter of about 1.0 mm to 10.0 mm, and a length of about 50 mm to 800 mm. ing.
この一対のカップ状電極ＥＬＥは、図２（ａ）に斜視図及び図２（ｂ）に展開斜視図で示すように一端に開口を有し、他端に底部ＣＡＰＢを一体的に有するキャップ体ＣＡＰと、このキャップ体ＣＡＰの底部ＣＡＰＢの外壁面に接合された円板ＤＩＳと、この円板ＤＩＳの外壁面の中心点に接合されたインナーリードＩＬＥとから構成されている。 The pair of cup-shaped electrodes ELE has a cap body integrally having an opening at one end and a bottom CAPB at the other end as shown in a perspective view in FIG. 2A and a developed perspective view in FIG. The CAP, a disc DIS joined to the outer wall surface of the bottom CAPB of the cap body CAP, and an inner lead ILE joined to the center point of the outer wall surface of the disc DIS.
このカップ状電極ＥＬＥは、キャップ体ＣＡＰの底部ＣＡＰＢの外壁面にこのキャップ体ＣＡＰと略同径の円板ＤＩＳを被せて当接させ、円板ＤＩＳの外壁側の方向から周方向の３個所の溶接点ＷＥＬ１で溶接法により接合されて電気的に接続され、さらに、この円板ＤＩＳの外壁の中心点には、ガラスの熱膨張率に近似する例えばニッケル−コバルト−鉄合金などからなるインナーリードＩＬＥがこのインナーリードＩＬＥ側から溶接部ＷＥＬ２で例えば抵抗溶接法またはレーザ溶接法により接合されて電気的に接続されている。 The cup-shaped electrode ELE is placed in contact with the outer wall surface of the bottom portion CAPB of the cap body CAP by covering the disk body DIS with the same diameter as the cap body CAP, and is arranged at three locations in the circumferential direction from the outer wall side direction of the disk DIS. The welding point WEL1 is joined by a welding method and is electrically connected. Further, an inner wall made of, for example, a nickel-cobalt-iron alloy that approximates the thermal expansion coefficient of glass is formed at the center point of the outer wall of the disc DIS. The lead ILE is joined and electrically connected from the inner lead ILE side at the welded portion WEL2 by, for example, resistance welding or laser welding.
なお、これらのキャップ体ＣＡＰ及び円板ＤＩＳは、何れもニッケル材のプレス成形体により形成され、その肉厚が約１．００ｍｍ〜１．５ｍｍ程度の厚さで形成されている。 Each of the cap body CAP and the disc DIS is formed of a press-molded body made of nickel and has a thickness of about 1.00 mm to 1.5 mm.
また、このインナーリードＩＬＥは、図１に示すようにガラスビーズＧＢＥに支持されてガラス管ＶＡＬに内外部を気密状態に封着されている。ガラスビーズＧＢＥは、ガラス管ＶＡＬの両端部に溶着させてガラス管ＶＡＬを封止切りし、外部に突出した一対のインナーリードＩＬＥには例えばニッケル材からなるアウターリードＯＬＥを突き合わせて溶接部ＷＥＬ３で例えばレーザ溶接法等により接合されて電気的に接続されている。この一対のアウターリードＯＬＥには、図示しない電源回路（一般にインバータ点灯回路）に接続されて対向する一対のカップ状電極ＥＬＥ間に点灯電力が供給される。 Further, as shown in FIG. 1, the inner lead ILE is supported by glass beads GBE and sealed inside and outside in a glass tube VAL in an airtight state. The glass beads GBE are welded to both ends of the glass tube VAL to seal off the glass tube VAL, and an outer lead OLE made of, for example, a nickel material is abutted with the pair of inner leads ILE projecting to the outside at the welded portion WEL3. For example, they are joined and electrically connected by a laser welding method or the like. The pair of outer leads OLE is supplied with lighting power between a pair of cup-shaped electrodes ELE that are connected to a power supply circuit (not shown) (generally an inverter lighting circuit) and are opposed to each other.
また、このように構成されたカップ状電極ＥＬＥの製作方法は、図２（ｂ）に示すようにキャップ体ＣＡＰの底部ＣＡＰＢの外壁面に円板ＤＩＳを被せて当接させ、この円板ＤＩＳの外壁側の方向から３点の溶接点ＷＥＬ１で例えば抵抗溶接法またはレーザ溶接法等により溶接固定して接合する。また、円板ＤＩＳの外壁中心点にインナーリードＩＬＥの一端を突き合わせてこのインナーリードＩＬＥ側の方向から溶接点ＷＥＬ２で溶接固定して接合する。さらに、このインナーリードＩＬＥの他端はアウターリードＯＬＥの一端に溶接点ＷＥＬ３で溶接固定して接合する。つまり、これらの各接合部材は、溶接点ＷＥＬ１，ＷＥＬ２，ＷＥＬ３におけるいずれの溶接固定をカップ状電極ＥＬＥの外壁側から行われ、溶接固定する順序は特に限定されることはない。 In addition, as shown in FIG. 2B, the manufacturing method of the cup-shaped electrode ELE having the above-described configuration is such that the disk DIS is put on and contacted with the outer wall surface of the bottom portion CAPB of the cap body CAP. Are welded and fixed by, for example, resistance welding or laser welding at three welding points WEL1 from the outer wall side direction. Further, one end of the inner lead ILE is abutted against the center point of the outer wall of the disk DIS, and is welded and fixed at the welding point WEL2 from the direction of the inner lead ILE. Further, the other end of the inner lead ILE is joined to one end of the outer lead OLE by welding and fixing at a welding point WEL3. That is, in each of these joining members, any welding fixing at the welding points WEL1, WEL2, and WEL3 is performed from the outer wall side of the cup-shaped electrode ELE, and the order of welding fixing is not particularly limited.
このようにして構成された冷陰極蛍光管は、カップ状電極ＥＬＥがキャップ体ＣＡＰの底部ＣＡＰＢの外壁側に円板ＤＩＳを接合させて形成したことにより、このカップ状電極ＥＬＥの底辺部の底厚を見かけ上、稼ぐことができるので、電食によるインナーリードＩＬＥから円板ＤＩＳに接合されたキャップ体ＣＡＰの脱落を確実に防止することができる。これによって安定した放電を長時間に亘って確保することができる。 The cold cathode fluorescent tube configured as described above has a cup-like electrode EL formed by joining a disc DIS to the outer wall side of the bottom part CAPB of the cap body CAP. Since the thickness can be apparently obtained, the cap body CAP joined to the disc DIS from the inner lead ILE due to electrolytic corrosion can be surely prevented. As a result, stable discharge can be secured over a long period of time.
また、このような製作方法によれば、キャップ体ＣＡＰと円板ＤＩＳとの溶接固定をこの円板ＤＩＳの外壁側から行なうことにより、キャップ体ＣＡＰの内壁面に溶接時に飛散する酸化物の付着が生じないカップ状電極ＥＬＥを製作することができる。 Further, according to such a manufacturing method, the welding of the cap body CAP and the disc DIS is performed from the outer wall side of the disc DIS, so that the oxide scattered on the inner wall surface of the cap body CAP is adhered. It is possible to manufacture a cup-shaped electrode ELE that does not cause the problem.
図３は、本発明による冷陰極蛍光管の実施例２による構成を示す要部拡大断面図であり、図４は、カップ状電極の構成を示す図であり、図４（ａ）は斜視図、図４（ｂ）は展開斜視図である。また、図３及び図４において、前述した図と同一部分には同一符号を付しその説明は省略する。なお、この図３においても、冷陰極蛍光管ＣＣＦＬの一端部側を示してある。 FIG. 3 is an enlarged cross-sectional view showing a main part of a cold cathode fluorescent tube according to a second embodiment of the present invention, FIG. 4 is a view showing the structure of a cup-shaped electrode, and FIG. 4 (a) is a perspective view. FIG. 4B is a developed perspective view. 3 and 4, the same parts as those in the above-described drawings are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 3 as well, one end side of the cold cathode fluorescent tube CCFL is shown.
図３において、この冷陰極蛍光管ＣＣＦＬのカップ状電極ＥＬＥは、前述した図１及び図２と異なる点は一端に開口を有し、他端に底部ＣＡＰＢ１を一体的に有する第１のキャップ体ＣＡＰ１と、この第１のキャップ体ＣＡＰ１の底部ＣＡＰＢ１の外壁に接合された第１のキャップ体ＣＡＰ１よりも内径が大きく且つ管長の短い底部ＣＡＰＢ２を一体的に有する第２のキャップ体ＣＡＰ２と、この第２のキャップ体ＣＡＰ２の底部ＣＡＰＢ２の外壁に接合された電力導入線ＩＬＥとから構成されている。 In FIG. 3, a cup-shaped electrode EL of the cold cathode fluorescent tube CCFL is different from the above-described FIGS. 1 and 2 in that a first cap body having an opening at one end and a bottom portion CAPB1 integrally at the other end. CAP1 and a second cap body CAP2 integrally having a bottom portion CAPB2 having a larger inner diameter and a shorter tube length than the first cap body CAP1 joined to the outer wall of the bottom portion CAPB1 of the first cap body CAP1, The power introduction line ILE is joined to the outer wall of the bottom portion CAPB2 of the second cap body CAP2.
このカップ状電極ＥＬＥは、第１キャップ体ＣＡＰ１の底部ＣＡＰＢ１の外壁から第２のキャップ体ＣＡＰ２を開口端側から被せてこの第２のキャップ体ＣＡＰ２の底部ＣＡＰＢ２の内壁を第１のキャップ体ＣＡＰ２の底部ＣＡＰＢ１の外壁に当接させ、底部ＣＡＰＢ２の外壁側の方向から周方向の３個所の溶接点ＷＥＬ４で接合されて電気的に接続され、この底部ＣＡＰＢ２の外壁の中心点には、ガラスの熱膨張率に近似する例えばニッケル−コバルト−鉄合金などからなるインナーリードＩＬＥがこのインナーリードＩＬＥ側から溶接部ＷＥＬ２で接合されて電気的に接続されている。 The cup-shaped electrode ELE covers the second cap body CAP2 from the opening end side from the outer wall of the bottom portion CAPB1 of the first cap body CAP1, and the inner wall of the bottom portion CAPB2 of the second cap body CAP2 covers the first cap body CAP2. The bottom wall CAPB1 is brought into contact with the outer wall of the bottom wall CAPB2 and joined at three welding points WEL4 in the circumferential direction from the direction of the outer wall side of the bottom wall CAPB2 to be electrically connected. An inner lead ILE made of, for example, a nickel-cobalt-iron alloy that approximates the thermal expansion coefficient is joined and electrically connected from the inner lead ILE side by a welded portion WEL2.
なお、この第１のキャップ体ＣＡＰ１及び第２のキャップ体ＣＡＰ２は、ニッケル材のプレス成形法により形成され、その肉厚が約１．００ｍｍ〜１．５ｍｍ程度の厚さで形成されている。 The first cap body CAP1 and the second cap body CAP2 are formed by a nickel material press molding method, and have a thickness of about 1.00 mm to 1.5 mm.
また、このように構成されたカップ状電極ＥＬＥの製作方法は、図４（ａ），（ｂ）に示すように第１のキャップ体ＣＡＰ１の底部ＣＡＰＢ１の外壁に第２のキャップ体ＣＡＰ２の底部ＣＡＰＢ２を被せて当接し、この第２のキャップ体ＣＡＰ２の外周壁面から周方向の３個所の溶接点ＷＥＬ４で抵抗溶接法またはレーザ溶接法により溶接固定して接合する。また、第２のキャップ体ＣＡＰ２の底部ＣＡＰＢ２の外壁中心点にインナーリードＩＬＥの一端を突き合わせてこのインナーリードＩＬＥ側の方向から溶接点ＷＥＬ２で抵抗溶接法またはレーザ溶接法等により溶接固定して接合する。このインナーリードＩＬＥの他端はアウターリードＯＬＥの一端に溶接点ＷＥＬ３で抵抗溶接法またはレーザ溶接法等により溶接固定して接合する。この場合も、これらの各接合部材は、溶接点ＷＥＬ２，ＷＥＬ３，ＷＥＬ４のいずれの溶接固定をカップ状電極ＥＬＥの外部側から行われ、溶接固定する順序は特に限定されない。 In addition, as shown in FIGS. 4A and 4B, the manufacturing method of the cup-shaped electrode ELE configured as described above is based on the bottom wall of the second cap body CAP2 on the outer wall of the bottom section CAPB1 of the first cap body CAP1. CAPB2 is covered and contacted, and welding is fixed by resistance welding or laser welding at three welding points WEL4 in the circumferential direction from the outer peripheral wall surface of the second cap body CAP2. Further, one end of the inner lead ILE is abutted against the center point of the outer wall of the bottom portion CAPB2 of the second cap body CAP2, and is welded and fixed from the direction of the inner lead ILE side at the welding point WEL2 by resistance welding or laser welding. To do. The other end of the inner lead ILE is joined to one end of the outer lead OLE by welding and fixing at a welding point WEL3 by a resistance welding method or a laser welding method. Also in this case, in these joining members, any welding fixing of the welding points WEL2, WEL3, and WEL4 is performed from the outside of the cup-shaped electrode ELE, and the order of welding fixing is not particularly limited.
このようにして構成された冷陰極蛍光管ＣＣＦＬにおいても、カップ状電極ＥＬＥは、第１のキャップ体ＣＡＰ１の底部ＣＡＰＢ１の外壁に第２のキャップ体ＣＡＰ２の底部ＣＡＰＢ２を接合させて形成したことにより、カップ状電極ＥＬＥの底辺部の底厚を見かけ上、稼ぐことができるので、電食によるインナーリードＩＬＥから第２のキャップ体ＣＡＰ２に接合された第１のキャップ体ＣＡＰ１の脱落を確実に防止することができる。これによって安定した放電を長時間に亘って確保することができる。 Also in the cold cathode fluorescent tube CCFL configured in this way, the cup-shaped electrode ELE is formed by joining the bottom part CAPB2 of the second cap body CAP2 to the outer wall of the bottom part CAPB1 of the first cap body CAP1. Since the bottom thickness of the bottom side of the cup-shaped electrode ELE can be apparently earned, the first cap body CAP1 joined to the second cap body CAP2 from the inner lead ILE due to electrolytic corrosion is surely prevented. can do. As a result, stable discharge can be secured over a long period of time.
このような製作方法においても、第１のキャップ体ＣＡＰ１と第２のキャップ体ＣＡＰ２との溶接固定をこの底部ＣＡＰＢ２の外壁側から行なうことにより、第１にキャップ体ＣＡＰ１の内壁面に溶接時に飛散する酸化物の付着が生じないカップ状電極ＥＬＥを製作することができる。 Also in such a manufacturing method, the first cap body CAP1 and the second cap body CAP2 are welded and fixed from the outer wall side of the bottom CAPB2, so that the first cap body CAP1 is scattered at the time of welding. Thus, it is possible to manufacture a cup-shaped electrode ELE that does not cause the oxide to adhere.
図５は、本発明による冷陰極蛍光管の実施例３による構成を示す要部拡大断面図であり、前述した図と同一部分には同一符号を付しその説明は省略する。なお、この図５においても冷陰極蛍光管ＣＣＦＬの一端部側を示してある。図５において、この冷陰極蛍光管ＣＣＦＬは、図３と異なる点は、第１のキャップ体ＣＡＰ１の管軸方向の長さが第２のキャップ体ＣＡＰ２の管軸方向の長さよりも短くして形成されている。 FIG. 5 is an enlarged cross-sectional view of a main part showing the configuration of the cold cathode fluorescent tube according to the third embodiment of the present invention. FIG. 5 also shows one end side of the cold cathode fluorescent tube CCFL. In FIG. 5, this cold cathode fluorescent tube CCFL is different from FIG. 3 in that the length of the first cap body CAP1 in the tube axis direction is shorter than the length of the second cap body CAP2 in the tube axis direction. Is formed.
このようにして構成された冷陰極蛍光管ＣＣＦＬにおいても、カップ状電極ＥＬＥは、第１のキャップ体ＣＡＰ１の底部ＣＡＰＢ１の外壁に第２のキャップ体ＣＡＰ２の底部ＣＡＰＢ２を接合させて形成したことにより、カップ状電極ＥＬＥの底辺部の底厚を見かけ上、稼ぐことができるので、電食によるインナーリードＩＬＥから第２のキャップ体ＣＡＰ２に接合された第１のキャップ体ＣＡＰ１の脱落を確実に防止することができる。これによって安定した放電を長時間に亘って確保することができる。 Also in the cold cathode fluorescent tube CCFL configured in this way, the cup-shaped electrode ELE is formed by joining the bottom part CAPB2 of the second cap body CAP2 to the outer wall of the bottom part CAPB1 of the first cap body CAP1. Since the bottom thickness of the bottom side of the cup-shaped electrode ELE can be apparently earned, the first cap body CAP1 joined to the second cap body CAP2 from the inner lead ILE due to electrolytic corrosion is surely prevented. can do. As a result, stable discharge can be secured over a long period of time.
図６は、本発明による冷陰極蛍光管の実施例４による構成を示す要部拡大断面図であり、前述した図と同一部分には同一符号を付しその説明は省略する。なお、この図６においても冷陰極蛍光管ＣＣＦＬの一端部側を示してある。図６において、この冷陰極蛍光管ＣＣＦＬは、図１と異なる点は第１のキャップ体ＣＡＰ１の底部ＣＡＰＢ１が第２のキャップ体ＣＡＰ２の内径寸法と略同等に形成され、この第１のキャップ体ＣＡＰ１の底部ＣＡＰＢ１が第２のキャップ体ＣＡＰ２の底部ＣＡＰＢ２内に嵌合させて第１の底部ＣＡＰＢ１と第２の底部ＣＡＰＢ２とを当接させ、第２のキャップ体ＣＡＰ２の外周壁面方向からの３個所の溶接点ＷＥＬ５で第１の底部ＣＡＰＢ１周辺で溶接固定して接合されている。 FIG. 6 is an enlarged cross-sectional view of the main part showing the configuration of the cold cathode fluorescent tube according to the fourth embodiment of the present invention. 6 also shows one end side of the cold cathode fluorescent tube CCFL. In FIG. 6, the cold cathode fluorescent tube CCFL is different from FIG. 1 in that the bottom portion CAPB1 of the first cap body CAP1 is formed substantially equal to the inner diameter of the second cap body CAP2. The bottom part CAPB1 of the CAP1 is fitted into the bottom part CAPB2 of the second cap body CAP2 to bring the first bottom part CAPB1 and the second bottom part CAPB2 into contact with each other, and 3 from the outer peripheral wall surface direction of the second cap body CAP2 It is welded and fixed around the first bottom portion CAPB1 at a welding point WEL5.
このようにして構成された冷陰極蛍光管ＣＣＦＬにおいても、カップ状電極ＥＬＥは、第１のキャップ体ＣＡＰ１の底部ＣＡＰＢ１の内壁に第２のキャップ体ＣＡＰ２の底部ＣＡＰＢ２を接合させて形成したことにより、カップ状電極ＥＬＥの底辺部の底厚を見かけ上、稼ぐことができるので、電食によるインナーリードＩＬＥから第２のキャップ体ＣＡＰ２に接合された第１のキャップ体ＣＡＰ１の脱落を確実に防止することができる。これによって安定した放電を長時間に亘って確保することができる。 Also in the cold cathode fluorescent tube CCFL configured in this way, the cup-shaped electrode ELE is formed by joining the bottom portion CAPB2 of the second cap body CAP2 to the inner wall of the bottom portion CAPB1 of the first cap body CAP1. Since the bottom thickness of the bottom side of the cup-shaped electrode ELE can be apparently earned, the first cap body CAP1 joined to the second cap body CAP2 from the inner lead ILE due to electrolytic corrosion is surely prevented. can do. As a result, stable discharge can be secured over a long period of time.
ＣＣＦＬ・・・冷陰極蛍光管、ＶＡＬ・・・ガラス管、ＦＬＵ・・・蛍光体膜、ＥＬＥ・・・カップ状電極、ＩＬＥ・・・インナーリード、ＧＢＥ・・・ガラスビーズ、ＯＬＥ・・・アウターリード、ＤＩＳ・・・円板、ＣＡＰ・・・キャップ体、ＣＡＰ１・・・第１のキャップ体、ＣＡＰ２・・・第２のキャップ体、ＣＡＰＢ・・・底部、ＣＡＰＢ１・・・第１の底部、ＣＡＰＢ２・・・第２の底部、ＷＥＬ１・・・溶接点、ＷＥＬ２・・・溶接点、ＷＥＬ３・・・溶接点、ＷＥＬ４・・・溶接点、ＷＥＬ５・・・溶接点。
CCFL ... Cold cathode fluorescent tube, VAL ... Glass tube, FLU ... Phosphor film, ELE ... Cup electrode, ILE ... Inner lead, GBE ... Glass bead, OLE ... Outer lead, DIS ... disc, CAP ... cap body, CAP1 ... first cap body, CAP2 ... second cap body, CAPB ... bottom, CAPB1 ... first Bottom, CAPB2 ... second bottom, WEL1 ... welding point, WEL2 ... welding point, WEL3 ... welding point, WEL4 ... welding point, WEL5 ... welding point.
Claims (10)
前記カップ状電極は、キャップ体と、前記キャップ体の底部外壁に接合された円板と、前記円板の外壁に接合された前記電力導入線とを有することを特徴とする冷陰極蛍光管。 A pair of cups having an open end on the discharge region side of the outer tube made of a translucent insulating material having a phosphor film formed on the inner surface, and a power introduction line joined to the bottom outer wall on the opposite end to the open end A cold cathode fluorescent tube having a cylindrical electrode inside both ends of the outer tube,
The cup-shaped electrode includes a cap body, a disk joined to the bottom outer wall of the cap body, and the power introduction line joined to the outer wall of the disk.
前記カップ状電極は、第１のキャップ体と、前記第１のキャップ体の底部外壁に接合された前記第１のキャップ体よりも内径が大きく且つ管長の短い第２のキャップ体と、前記第２のキャップ体の底部外壁に接合された前記電力導入線とを有することを特徴とする冷陰極蛍光管。 A pair of cups having an open end on the discharge region side of the outer tube made of a translucent insulating material having a phosphor film formed on the inner surface, and a power introduction line joined to the bottom outer wall on the opposite end to the open end A cold cathode fluorescent tube having a cylindrical electrode inside both ends of the outer tube,
The cup-shaped electrode includes a first cap body, a second cap body having an inner diameter larger than that of the first cap body joined to the bottom outer wall of the first cap body and a short tube length, and the first cap body A cold cathode fluorescent tube comprising: the power introduction line joined to the outer wall of the bottom of the cap body.
前記カップ状電極は、キャップ体と、前記キャップ体の底部外壁に接合された円板と、前記円板の外壁に接合された前記電力導入線とを有し、前記キャップ体の底部外壁に前記円板を当接し、当該円板の外壁側の方向から溶接し、前記円板の外壁に前記電力導入線を突き合わせて当該電力導入線側の方向から溶接することを特徴とする冷陰極蛍光管の製造方法。 A pair of cups having an open end on the discharge region side of the outer tube made of a translucent insulating material having a phosphor film formed on the inner surface, and a power introduction line joined to the bottom outer wall on the opposite end to the open end A cold cathode fluorescent tube manufacturing method comprising a cylindrical electrode at both ends of the outer tube,
The cup-shaped electrode has a cap body, a disc joined to the bottom outer wall of the cap body, and the power introduction line joined to the outer wall of the disc, and the cup-like electrode is formed on the bottom outer wall of the cap body. A cold cathode fluorescent tube comprising a disk abutting, welding from a direction on the outer wall side of the disk, and abutting the power introduction line against the outer wall of the disk and welding from the direction of the power introduction line Manufacturing method.
前記カップ状電極は、第１のキャップ体と、前記第１のキャップ体の底部外壁に接合された前記第１のキャップ体よりも内径が大きく且つ管長の短い第２のキャップ体と、前記第２のキャップ体の底部外壁に接合された前記電力導入線とを有し、
前記第１のキャップ体の底部外壁に前記第２のキャップ体の底部内壁を当接し、前記第２のキャップ体の底部外壁側の方向から溶接し、前記第２のキャップの底部外壁に前記電力導入線を突き合わせて前記当該電力導入線側の方向から溶接すること特徴とする冷陰極蛍光管の製造方法。 A pair of cups having an open end on the discharge region side of the outer tube made of a translucent insulating material having a phosphor film formed on the inner surface, and a power introduction line joined to the bottom outer wall on the opposite end to the open end A cold cathode fluorescent tube manufacturing method comprising a cylindrical electrode at both ends of the outer tube,
The cup-shaped electrode includes a first cap body, a second cap body having an inner diameter larger than that of the first cap body joined to the bottom outer wall of the first cap body and a short tube length, and the first cap body And the power introduction line joined to the bottom outer wall of the cap body of 2;
The bottom inner wall of the second cap body is brought into contact with the bottom outer wall of the first cap body, welded from the bottom outer wall side direction of the second cap body, and the electric power is applied to the bottom outer wall of the second cap. A method of manufacturing a cold cathode fluorescent tube, wherein the lead-in wires are butted and welded from the direction of the power lead-in side.
The method for manufacturing a cold cathode fluorescent tube according to any one of claims 5 to 8, wherein the welding is resistance welding.
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| JP2010186673A (en) * | 2009-02-13 | 2010-08-26 | Aitekku Kk | Method for manufacturing electrode for cold-cathode lamp |
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| JP2002117804A (en) * | 2000-10-10 | 2002-04-19 | Ay Tekku:Kk | Electrode structure of cold negative electrode fluorescent lamp |
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| JP2002289135A (en) * | 2001-03-27 | 2002-10-04 | West Electric Co Ltd | Cold cathode discharge tube and illuminating device |
| JP2004165007A (en) * | 2002-11-13 | 2004-06-10 | West Electric Co Ltd | Manufacturing method of electrode, electrode, and cold-cathode discharge tube using the same |
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| JP2002117804A (en) * | 2000-10-10 | 2002-04-19 | Ay Tekku:Kk | Electrode structure of cold negative electrode fluorescent lamp |
| JP2002270131A (en) * | 2001-03-12 | 2002-09-20 | West Electric Co Ltd | Cold cathode discharge tube and luminaire |
| JP2002289135A (en) * | 2001-03-27 | 2002-10-04 | West Electric Co Ltd | Cold cathode discharge tube and illuminating device |
| JP2004165007A (en) * | 2002-11-13 | 2004-06-10 | West Electric Co Ltd | Manufacturing method of electrode, electrode, and cold-cathode discharge tube using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010186673A (en) * | 2009-02-13 | 2010-08-26 | Aitekku Kk | Method for manufacturing electrode for cold-cathode lamp |
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