JP2879417B2 - Manufacturing method of cold cathode discharge tube - Google Patents
Manufacturing method of cold cathode discharge tubeInfo
- Publication number
- JP2879417B2 JP2879417B2 JP28784395A JP28784395A JP2879417B2 JP 2879417 B2 JP2879417 B2 JP 2879417B2 JP 28784395 A JP28784395 A JP 28784395A JP 28784395 A JP28784395 A JP 28784395A JP 2879417 B2 JP2879417 B2 JP 2879417B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- shaped
- cathode discharge
- cold cathode
- pipe
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、冷陰極放電管の
製造方法に係り、特に、Ｕ字管の両端開口を気密封止し
て気密容器と成した冷陰極放電管の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a cold cathode discharge tube, and more particularly to a method for manufacturing a cold cathode discharge tube in which both ends of a U-shaped tube are hermetically sealed to form an airtight container.
【０００２】[0002]
【従来の技術】従来、Ｕ字管の両端開口を気密封止して
気密容器と成した冷陰極放電管としては、例えば図６に
示すような、放電によって発生する紫外線により蛍光体
を励起発光させて可視光を得るものがある。該冷陰極放
電管は、一本の細長いガラス管を中央付近で湾曲加工す
ることにより、一対の直管部６０ａ，６０ｂ及び両直管
部６０ａ，６０ｂを連通接続する曲管部６２を備えたＵ
字管６４と成し、該Ｕ字管６４の両端開口を溶融封止し
て気密容器６６を構成している。該気密容器６６内に
は、紫外線放射ガスが封入されると共に、気密容器６６
内周面に蛍光体６８が被着されている。また、気密容器
６６の両端封止部７０ａ，７０ｂ近傍に漏斗状の放電電
極７２ａ，７２ｂが対向配置されると共に、該放電電極
７２ａ，７２ｂに接続されたリード端子７４ａ，７４ｂ
が、両端封止部７０ａ，７０ｂを貫通して気密容器６６
外へと導出されている。上記構成の冷陰極放電管は、例
えば図示しないランプケース内に収納され、照明や表示
用の光源として用いられるものである。2. Description of the Related Art Conventionally, a cold cathode discharge tube in which both ends of a U-shaped tube are hermetically sealed to form a hermetic container is shown in FIG. In some cases, visible light is obtained. The cold cathode discharge tube was provided with a pair of straight tube portions 60a and 60b and a curved tube portion 62 that connects and connects the straight tube portions 60a and 60b by bending one elongated glass tube near the center. U
An airtight container 66 is formed by fusing and sealing both ends of the U-shaped tube 64. In the airtight container 66, an ultraviolet radiation gas is sealed, and the airtight container 66 is filled.
A phosphor 68 is attached to the inner peripheral surface. In addition, funnel-shaped discharge electrodes 72a and 72b are disposed opposite to each other near the sealing portions 70a and 70b at both ends of the airtight container 66, and the lead terminals 74a and 74b connected to the discharge electrodes 72a and 72b.
Is passed through the sealing portions 70a, 70b at both ends to form an airtight container 66.
It is led out. The cold cathode discharge tube having the above configuration is housed in, for example, a lamp case (not shown) and used as a light source for illumination and display.
【０００３】而して、上記冷陰極放電管の放電電極７２
ａ，７２ｂ間に高周波電圧を印加すると、両放電電極７
２ａ，７２ｂ間で放電が生成され、紫外線が放射され
る。この紫外線によって蛍光体６８が励起され、蛍光体
６８の種類の応じた発光色を備えた光が発生し、外部へ
と放射されるのである。The discharge electrode 72 of the cold cathode discharge tube is
When a high frequency voltage is applied between the discharge electrodes 7a and 72b,
Discharge is generated between 2a and 72b, and ultraviolet rays are emitted. The ultraviolet light excites the phosphor 68 to generate light having an emission color corresponding to the type of the phosphor 68, and the light is emitted to the outside.
【０００４】また、上記以外に、Ｕ字管の両端開口を気
密封止して気密容器と成した従来の冷陰極放電管として
は、蛍光体や紫外線放射ガスを用いることなく、ネオン
を主体とした放電ガスを気密容器内に封入した冷陰極放
電管に代表される、放電によって直接可視光を得る冷陰
極放電管があった。In addition to the above, a conventional cold-cathode discharge tube in which both ends of a U-shaped tube are hermetically sealed to form a hermetic container is mainly made of neon without using a phosphor or an ultraviolet radiation gas. There is a cold-cathode discharge tube that directly obtains visible light by discharging, such as a cold-cathode discharge tube in which the discharged discharge gas is sealed in an airtight container.
【０００５】[0005]
【発明が解決しようとする課題】しかし、上記従来の冷
陰極放電管にあっては、一本の細長いガラス管を中央付
近で湾曲加工してＵ字管６４を形成する際に、一対の直
管部６０ａ，６０ｂを近接せしめようとすると、曲管部
６２の外周が肉薄となり機械的強度が不足してしまうた
め、直管部６０ａ，６０ｂ間の間隙をあまり小さくする
ことができなかった。そのために、直管部６０ａ，６０
ｂの光が拡散してしまい、高輝度な冷陰極放電管を得る
ことができないといった欠点があった。また、冷陰極放
電管の外形が大きくなるため、素子の小型化を実現する
ことができなかった。However, in the above-mentioned conventional cold cathode discharge tube, when a single elongated glass tube is bent near the center to form a U-shaped tube 64, a pair of straight tubes is formed. If the tube portions 60a and 60b are made to approach each other, the outer circumference of the curved tube portion 62 becomes thin and the mechanical strength becomes insufficient, so that the gap between the straight tube portions 60a and 60b cannot be made too small. Therefore, the straight pipe sections 60a, 60
There is a disadvantage that the light of b is diffused and a high-brightness cold cathode discharge tube cannot be obtained. Further, since the outer shape of the cold-cathode discharge tube becomes large, it has not been possible to reduce the size of the device.
【０００６】特に、放電によって発生する紫外線により
蛍光体を励起発光させて可視光を得る冷陰極放電管の場
合には、Ｕ字管６４の一対の直管部６０ａ，６０ｂ間の
間隙を小さくすることができないために、一方の直管部
６０ａ，６０ｂ内で放電により放射された紫外線が該直
管部６０ａ，６０ｂを透過し、他方の直管部６０ｂ，６
０ａ内に入射して他方の直管部６０ｂ，６０ａ内の蛍光
体６８を励起せしめることができず、その結果、蛍光体
の発光効率が低く、高輝度化を図ることができなかっ
た。In particular, in the case of a cold-cathode discharge tube that excites a phosphor with ultraviolet light generated by discharge to obtain visible light, the gap between the pair of straight tube portions 60a and 60b of the U-shaped tube 64 is reduced. Therefore, the ultraviolet rays emitted by the discharge in one of the straight pipe sections 60a and 60b pass through the straight pipe sections 60a and 60b, and the other straight pipe sections 60b and 6b.
0a, and the phosphor 68 in the other straight tube portions 60b, 60a could not be excited. As a result, the luminous efficiency of the phosphor was low, and high luminance could not be achieved.
【０００７】この発明は、従来の上記問題点に鑑みて案
出されたものであり、その目的とするところは、Ｕ字管
の両直管部を近接させることにより、高輝度且つ小型の
冷陰極放電管の製造方法を実現することを目的とする。The present invention has been devised in view of the above-mentioned conventional problems, and has as its object to provide a high-intensity and small-sized cooling device by bringing both straight pipe portions of a U-shaped tube close to each other. An object of the present invention is to realize a method for manufacturing a cathode discharge tube.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
め、本発明に係る冷陰極放電管の製造方法は、両端が開
口した細長いガラス管を加熱し、中央付近で湾曲加工せ
しめ、以て、近接配置又は接触配置された一対の直管部
及び両直管部を連通接続する曲管部を備えたＵ字管を形
成し、次に、該Ｕ字管の曲管部近傍を加熱して曲管部外
周に排気管を融着し、また、リード端子を接続した一対
の放電電極を、上記リード端子の一端がＵ字管外に配置
されるよう上記Ｕ字管の両端開口から挿入した後、Ｕ字
管の両端開口を気密封止して成り、さらに、上記排気管
を介してＵ字管内の排気及び放電ガスの充填を行った後
に、上記排気管を加熱溶融して、曲管部の外周にレンズ
状の肉厚部が形成されるように封じ切ることを特徴とす
る。In order to achieve the above object, a method of manufacturing a cold cathode discharge tube according to the present invention comprises heating an elongated glass tube having both open ends and bending the glass tube near its center. Forming a U-shaped pipe having a pair of straight pipes disposed close to or in contact with each other and a bent pipe connecting and connecting the two straight pipes, and then heating the vicinity of the bent pipe of the U-shaped pipe; The exhaust pipe is fused to the outer periphery of the bent pipe part, and a pair of discharge electrodes to which lead terminals are connected are inserted from both ends of the U-shaped tube such that one end of the lead terminal is disposed outside the U-shaped tube. After that, the opening at both ends of the U-shaped pipe is hermetically sealed. Further, after the exhaust pipe and the discharge gas are filled in the U-shaped pipe through the exhaust pipe, the exhaust pipe is heated and melted to be bent. It is characterized in that the tube is sealed off so that a lens-shaped thick portion is formed on the outer periphery of the tube.
【０００９】而して、本発明に係る冷陰極放電管の製造
方法にあっては、Ｕ字管の曲管部外周に排気管を封じ切
って成るレンズ状の肉厚部が形成されるため、曲管部外
周の機械的強度が向上し、両直管部を近接配置又は接触
配置させても、Ｕ字管が破損することがない。In the method for manufacturing a cold cathode discharge tube according to the present invention, a lens-shaped thick portion formed by sealing an exhaust pipe is formed on the outer periphery of a curved portion of a U-shaped tube. In addition, the mechanical strength of the outer periphery of the curved pipe portion is improved, and the U-shaped pipe is not damaged even if both straight pipe portions are arranged close to or in contact with each other.
【００１０】[0010]
【発明の実施の形態】以下、添付図面に基づき、本発明
に係る冷陰極放電管及び冷陰極放電管の製造方法の実施
の形態を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a cold cathode discharge tube and a method for manufacturing a cold cathode discharge tube according to the present invention will be described with reference to the accompanying drawings.
【００１１】図１に示す冷陰極放電管１０は、放電によ
って発生する紫外線によって蛍光体を励起発光させる冷
陰極放電管である。即ち、石英ガラス等の紫外線透過ガ
ラスより成る一本の細長いガラス管を中央付近で湾曲加
工して、一対の直管部１２ａ，１２ｂ及び両直管部１２
ａ，１２ｂを連通接続する曲管部１４を備えたＵ字管１
６を構成し、該Ｕ字管１６の両端開口を溶融封止して気
密容器１８と成している。尚、該気密容器１８の全長は
４０ｍｍ、また各直管部１２ａ，１２ｂの外径は３ｍｍ
となされている。A cold-cathode discharge tube 10 shown in FIG. 1 is a cold-cathode discharge tube that excites and emits a phosphor by ultraviolet rays generated by electric discharge. That is, a single elongated glass tube made of an ultraviolet transmitting glass such as quartz glass is bent near the center to form a pair of straight tube portions 12a and 12b and both straight tube portions 12a and 12b.
U-shaped tube 1 provided with a curved tube portion 14 for communicating and connecting a and 12b
6, and the both ends of the U-shaped tube 16 are melt-sealed to form an airtight container 18. The total length of the airtight container 18 is 40 mm, and the outer diameter of each of the straight pipe portions 12a and 12b is 3 mm.
It has been done.
【００１２】該気密容器１８内には、放電ガスとしてＡ
ｒ−Ｈｇ，Ｘｅ−Ｃｌ，Ｘｅ−Ｂｒ等の紫外線放射ガス
が封入されると共に、気密容器１８内周面に蛍光体２０
が被着されている。該蛍光体２０は、所望の発光色に応
じて適宜選択されるものであり、赤色発光用の蛍光体と
しては例えばＹＶＯ４：Ｅｕ、緑色発光用の蛍光体とし
ては例えばＺｎ２ＳｉＯ４：Ｍｎ、青色発光用の蛍光体
としては例えば（Ｂａ，Ｍｇ）２Ａｌ１４Ｏ２３：Ｅｕ
２＋を選択すればよい。In the hermetic container 18, A is used as a discharge gas.
An ultraviolet radiation gas such as r-Hg, Xe-Cl, Xe-Br or the like is sealed, and a phosphor 20 is provided on the inner peripheral surface of the hermetic container 18.
Is attached. The phosphor 20 is appropriately selected in accordance with a desired emission color. For example, a phosphor for emitting red light is YVO 4 : Eu, and a phosphor for emitting green light is, for example, Zn 2 SiO 4 : Mn. As a phosphor for emitting blue light, for example, (Ba, Mg) 2 Al 14 O 23 : Eu
What is necessary is just to select 2+ .
【００１３】また、気密容器１８の両端封止部２２ａ，
２２ｂ近傍に、タングステン，モリブデン，カーボン等
より成る漏斗状の放電電極２４ａ，２４ｂが対向配置さ
れると共に、該放電電極２４ａ，２４ｂに接続されたリ
ード端子２６ａ，２６ｂが、両端封止部２２ａ，２２ｂ
を貫通して気密容器１８外へと導出されている。該リー
ド端子２６ａ，２６ｂ間の間隙は約３．２ｍｍ〜４ｍｍ
となっている。Further, both end sealing portions 22a of the airtight container 18 are provided.
In the vicinity of 22b, funnel-shaped discharge electrodes 24a, 24b made of tungsten, molybdenum, carbon, or the like are arranged to face each other, and lead terminals 26a, 26b connected to the discharge electrodes 24a, 24b are sealed at both ends sealing portions 22a, 22a. 22b
Through the airtight container 18. The gap between the lead terminals 26a and 26b is about 3.2 mm to 4 mm.
It has become.
【００１４】上記一対の直管部１２ａ，１２ｂは、その
間隙が１ｍｍ以内となるよう近接配置されている。尚、
図示は省略するが、一対の直管部１２ａ，１２ｂを接触
配置してもよい。而して、一対の直管部１２ａ，１２ｂ
の間隙が１ｍｍ以内となるよう近接配置したことから、
気密容器１８の横幅Ｘは７ｍｍ以内となされている。ま
た、曲管部１４の外周には凸レンズ状の肉厚部２８が形
成されている。The pair of straight pipe portions 12a and 12b are arranged close to each other so that the gap is within 1 mm. still,
Although not shown, a pair of straight pipe portions 12a and 12b may be arranged in contact. Thus, the pair of straight pipe portions 12a, 12b
Because they were placed close to each other so that the gap between them was within 1 mm,
The width X of the airtight container 18 is set to be within 7 mm. A convex lens-shaped thick portion 28 is formed on the outer periphery of the curved tube portion 14.
【００１５】上記構成を有する冷陰極放電管１０は、図
２に示すような樹脂製ランプケース３０内の底面３２に
穿設された凹部内にその両端部を挿入し、リード端子２
６ａ，２６ｂをランプケース３０の外部端子３２ａ，３
２ｂと接続することにより、ランプケース３０内に収納
され、照明や表示用の光源として用いられる。上記ラン
プケース３０の内周面３４は、底面３２から上端開口３
６に向けて径が拡大する漏斗形状となっており、その表
面にはアルミニウム蒸着等によって反射層３８が形成さ
れている。また、ランプケース３０の上端開口３６は、
蓋部材４０によって閉塞されている。The cold-cathode discharge tube 10 having the above-described configuration is configured such that both ends thereof are inserted into recesses formed in a bottom surface 32 of a resin lamp case 30 as shown in FIG.
6a, 26b are connected to the external terminals 32a, 3 of the lamp case 30.
By connecting to 2b, it is stored in the lamp case 30 and used as a light source for illumination and display. The inner peripheral surface 34 of the lamp case 30 extends from the bottom surface 32 to the upper end opening 3.
It has a funnel shape whose diameter increases toward 6, and a reflective layer 38 is formed on its surface by aluminum evaporation or the like. The upper end opening 36 of the lamp case 30 is
It is closed by the lid member 40.
【００１６】而して、上記冷陰極放電管１０の放電電極
２４ａ，２４ｂ間に高周波電圧を印加すると、両放電電
極２４ａ，２４ｂ間で放電が生成され、紫外線が放射さ
れる。この紫外線が、蛍光体２０に照射されると、蛍光
体２０が励起され、当該蛍光体２０の種類に応じた発光
色を備えた光が発生し、冷陰極放電管１０の外部へと放
射されるのである。When a high-frequency voltage is applied between the discharge electrodes 24a and 24b of the cold cathode discharge tube 10, a discharge is generated between the discharge electrodes 24a and 24b and ultraviolet rays are emitted. When this ultraviolet ray is applied to the phosphor 20, the phosphor 20 is excited to generate light having an emission color corresponding to the type of the phosphor 20, which is emitted to the outside of the cold cathode discharge tube 10. Because
【００１７】上記冷陰極放電管１０にあっては、一対の
直管部１２ａ，１２ｂの間隙が１ｍｍ以内となるよう近
接配置されていることから、両直管部１２ａ，１２ｂの
光が密となり、また、一方の直管部１２ａ，１２ｂ内で
放電により放射された紫外線が該直管部１２ａ，１２ｂ
を透過して他方の直管部１２ｂ，１２ａ内に入射し、他
方の直管部１２ｂ，１２ａ内の蛍光体２０を励起するた
め、蛍光体２０の発光効率が向上し、高輝度の冷陰極放
電管１０を実現することができる。In the cold-cathode discharge tube 10, since the pair of straight tube portions 12a and 12b are arranged close to each other so as to be within 1 mm, the light of both straight tube portions 12a and 12b becomes dense. In addition, the ultraviolet rays radiated by the discharge in one of the straight pipe portions 12a, 12b emit the ultraviolet rays.
Is transmitted into the other straight tube portions 12b and 12a to excite the phosphor 20 in the other straight tube portions 12b and 12a, so that the luminous efficiency of the phosphor 20 is improved and a high-brightness cold cathode is used. The discharge tube 10 can be realized.
【００１８】また、一対の直管部１２ａ，１２ｂを近接
配置したことにより、冷陰極放電管１０の外形を小さく
することができ、冷陰極放電管１０の小型化を実現する
ことができる。Further, by arranging the pair of straight tube portions 12a and 12b close to each other, the outer shape of the cold cathode discharge tube 10 can be reduced, and the size of the cold cathode discharge tube 10 can be reduced.
【００１９】さらに、上記冷陰極放電管１０は、曲管部
１４の外周に凸レンズ状の肉厚部２８が形成されている
ため、光は当該肉厚部２８で集光されて外部へと放射さ
れので、冷陰極放電管１０の輝度が、より一層向上す
る。Further, since the cold-cathode discharge tube 10 has a thick portion 28 in the shape of a convex lens formed on the outer periphery of the curved tube portion 14, light is condensed by the thick portion 28 and emitted to the outside. Therefore, the brightness of the cold cathode discharge tube 10 is further improved.
【００２０】以下に、図３〜図５に基づいて、上記冷陰
極放電管１０の製造方法を説明する。先ず、紫外線透過
ガラスより成り、両端が開口した一本の細長いガラス管
を用意し、このガラス管をバーナーで加熱し、その中央
付近で湾曲加工せしめ、以て、近接配置又は接触配置さ
れた一対の直管部１２ａ，１２ｂ及び両直管部１２ａ，
１２ｂを連通接続する曲管部１４を備えたＵ字管４２を
構成する。このとき、一対の直管部１２ａ，１２ｂを近
接配置又は接触配置させたことにより、曲管部１４の外
周側は肉薄となり機械的強度が小さくなっている。A method of manufacturing the cold cathode discharge tube 10 will be described below with reference to FIGS. First, one elongated glass tube made of ultraviolet transmitting glass and having both ends opened is prepared, and this glass tube is heated by a burner and bent near the center thereof. Straight pipe portions 12a, 12b and both straight pipe portions 12a,
A U-shaped tube 42 having a curved tube portion 14 for connecting and connecting 12b is constituted. At this time, by arranging the pair of straight pipe portions 12a and 12b close to or in contact with each other, the outer peripheral side of the curved pipe portion 14 becomes thinner and mechanical strength is reduced.
【００２１】次に、図３に示すように曲管部１４外周側
をバーナー４４で加熱しつつ、Ｕ字管４２の一端開口を
閉塞すると共に、他端開口から空気を送り込むことによ
り、機械的強度の小さくなっている曲管部１４外周を開
孔し、該開孔部に排気管４６を融着して曲管部１４外周
に排気管４６を連通接続し、略Ｙ字状のガラス管を形成
する（図４）。Next, as shown in FIG. 3, while the outer peripheral side of the curved tube portion 14 is heated by the burner 44, one end opening of the U-shaped tube 42 is closed, and air is sent in from the other end opening, thereby mechanically. A substantially Y-shaped glass tube is formed by opening an outer periphery of the curved pipe portion 14 having reduced strength, fusing an exhaust pipe 46 to the opening portion, and connecting the exhaust pipe 46 to the outer periphery of the curved pipe portion 14. Is formed (FIG. 4).
【００２２】次いで、Ｕ字管４２の内周面に蛍光体２０
を被着させる。この蛍光体２０の被着方法としては、例
えば液状の蛍光体２０が満たされた図示しない槽内に、
Ｕ字管４２の両端開口を入れ、排気管４６を通じて蛍光
体２０を吸引することにより被着する方法、或いは蛍光
体２０が満たされた槽内に、Ｕ字管４２全体を入れ、Ｕ
字管４２内周面及び外周面に蛍光体２０を被着させた後
に、Ｕ字管４２外周面の蛍光体２０を拭き取る方法等が
ある。Next, the phosphor 20 is placed on the inner peripheral surface of the U-shaped tube 42.
Is adhered. As a method for applying the phosphor 20, for example, in a tank (not shown) filled with the liquid phosphor 20,
A method in which both ends of the U-shaped tube 42 are inserted, and the phosphor 20 is applied by suctioning through the exhaust pipe 46, or the entire U-shaped tube 42 is put in a tank filled with the phosphor 20,
After attaching the phosphor 20 to the inner and outer peripheral surfaces of the U-shaped tube 42, there is a method of wiping the phosphor 20 on the outer peripheral surface of the U-shaped tube 42, or the like.
【００２３】そして、リード端子２６ａ，２６ｂを接続
した一対の放電電極２４ａ，２４ｂをＵ字管４２の両端
開口からそれぞれ管内に挿入する。この際、リード端子
２６ａ，２６ｂの下端は、Ｕ字管４２から外部へ突き出
た状態としておく。そして、Ｕ字管４２の両端表面を加
熱溶融させ、溶融部分をピンチャーによって内方向へ圧
潰して気密に封着する。この結果、リード端子２６ａ，
２６ｂの中途部は、Ｕ字管４２の封着部に埋没して固定
されると共に、リード端子２６ａ，２６ｂの下端はＵ字
管４２の外部に導出される。Then, a pair of discharge electrodes 24a, 24b to which the lead terminals 26a, 26b are connected are inserted into the U-shaped tube 42 from both ends of the tube. At this time, the lower ends of the lead terminals 26a and 26b are made to protrude from the U-shaped tube 42 to the outside. Then, both end surfaces of the U-shaped tube 42 are heated and melted, and the melted portion is crushed inward by a pincher to hermetically seal. As a result, the lead terminals 26a,
The middle part of 26b is buried and fixed in the sealing part of the U-shaped tube 42, and the lower ends of the lead terminals 26a and 26b are led out of the U-shaped tube 42.
【００２４】次に、図示しない排気装置に連通する上記
排気管４６を介して、Ｕ字管４２内を排気して高真空状
態とした後、紫外線放射ガスを充填する。その後、図５
に示すように、排気管４６をバーナー４４で加熱して溶
融させ、曲管部１４の外周に凸レンズ状の肉厚部２８が
形成されるように封じ切ることにより、図１に示す冷陰
極放電管１０を形成するのである。尚、排気管４６は、
肉厚部２８となって冷陰極放電管１０の一部を構成する
ため、Ｕ字管４２と同じ材質の紫外線透過ガラスを用い
るのが望ましい。Next, the inside of the U-shaped pipe 42 is evacuated to a high vacuum state through the exhaust pipe 46 communicating with an exhaust device (not shown), and then filled with ultraviolet radiation gas. Then, FIG.
As shown in FIG. 1, the exhaust pipe 46 is heated and melted by the burner 44, and the exhaust pipe 46 is sealed off so that the convex lens-shaped thick part 28 is formed on the outer periphery of the curved pipe part 14, so that the cold cathode discharge shown in FIG. The tube 10 is formed. The exhaust pipe 46 is
In order to form a part of the cold cathode discharge tube 10 as the thick portion 28, it is desirable to use an ultraviolet transmitting glass of the same material as the U-shaped tube 42.
【００２５】上記の冷陰極放電管１０の製造方法にあっ
ては、Ｕ字管４２の両直管部１２ａ，１２ｂを近接配置
又は接触配置させたことにより機械的強度が小さくなっ
た曲管部１４外周に、排気管４６を封じ切って成るレン
ズ状の肉厚部２８を形成したので、曲管部１４外周の機
械的強度が補強され、その結果、両直管部１２ａ，１２
ｂが近接配置又は接触配置された冷陰極放電管１０を製
造することができる。In the method of manufacturing the cold cathode discharge tube 10 described above, the curved tube portion whose mechanical strength is reduced by arranging the straight tube portions 12a and 12b of the U-shaped tube 42 close to or in contact with each other. Since the lens-shaped thick portion 28 formed by sealing off the exhaust pipe 46 is formed on the outer periphery of the curved tube portion 14, the mechanical strength of the outer periphery of the curved tube portion 14 is reinforced, and as a result, both straight tube portions 12a, 12
It is possible to manufacture the cold cathode discharge tube 10 in which “b” is arranged in close proximity or in contact.
【００２６】尚、上記では、放電によって発生する紫外
線によって蛍光体を励起発光させて可視光を得る冷陰極
放電管の場合を例にとって説明したが、ネオンを主体と
した放電ガスを気密容器内に封入した冷陰極放電管に代
表される、放電によって直接可視光を得る冷陰極放電管
にも適用可能である。In the above description, a cold cathode discharge tube in which visible light is obtained by exciting a phosphor with ultraviolet light generated by discharge to obtain visible light is described as an example, but a discharge gas mainly composed of neon is placed in an airtight container. The present invention is also applicable to a cold cathode discharge tube that directly obtains visible light by discharging, such as a sealed cold cathode discharge tube.
【００２７】[0027]
【発明の効果】本発明に係る冷陰極放電管の製造方法に
あっては、Ｕ字管の曲管部外周に排気管を封じ切って成
るレンズ状の肉厚部を形成することにより、曲管部外周
の機械的強度を向上せしめたので、Ｕ字管の両直管部を
近接配置又は接触配置させて高輝度且つ小型の冷陰極放
電管を製造することができる。In the method for manufacturing a cold cathode discharge tube according to the present invention, a curved portion is formed by forming a lens-shaped thick portion formed by sealing an exhaust pipe around the curved portion of a U-shaped tube. Since the mechanical strength of the outer periphery of the tube portion has been improved, both straight tube portions of the U-shaped tube can be arranged close to or in contact with each other to manufacture a high-luminance and small-sized cold cathode discharge tube.
【図１】本発明に係る冷陰極放電管を示す縦断面図であ
る。FIG. 1 is a longitudinal sectional view showing a cold cathode discharge tube according to the present invention.
【図２】本発明に係る冷陰極放電管をランプケース内に
収納した状態を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a state where the cold cathode discharge tube according to the present invention is housed in a lamp case.
【図３】本発明に係る冷陰極放電管の製造方法を示す説
明図である。FIG. 3 is an explanatory view showing a method for manufacturing a cold cathode discharge tube according to the present invention.
【図４】本発明に係る冷陰極放電管の製造方法を示す説
明図である。FIG. 4 is an explanatory view showing a method for manufacturing a cold cathode discharge tube according to the present invention.
【図５】本発明に係る冷陰極放電管の製造方法を示す説
明図である。FIG. 5 is an explanatory view showing a method for manufacturing a cold cathode discharge tube according to the present invention.
【図６】従来の冷陰極放電管を示す縦断面図である。FIG. 6 is a longitudinal sectional view showing a conventional cold cathode discharge tube.
１０ 冷陰極放電管 １２ａ，１２ｂ 直管部 １４ 曲管部 １６ Ｕ字管 １８ 気密容器 ２０ 蛍光体 ２２ａ，２２ｂ 封止部 ２４ａ，２４ｂ 放電電極 ２６ａ，２６ｂ リード端子 ２８ 肉厚部 ４２ Ｕ字管 ４６ 排気管 DESCRIPTION OF SYMBOLS 10 Cold-cathode discharge tube 12a, 12b Straight tube part 14 Curved tube part 16 U-shaped tube 18 Hermetic container 20 Phosphor 22a, 22b Sealing part 24a, 24b Discharge electrode 26a, 26b Lead terminal 28 Thick part 42 U-shaped tube 46 Exhaust pipe
Claims (1)
し、中央付近で湾曲加工せしめ、以て、近接配置又は接
触配置された一対の直管部及び両直管部を連通接続する
曲管部を備えたＵ字管を形成し、次に、該Ｕ字管の曲管
部近傍を加熱して曲管部外周に排気管を融着し、また、
リード端子を接続した一対の放電電極を、上記リード端
子の一端がＵ字管外に配置されるよう上記Ｕ字管の両端
開口から挿入した後、Ｕ字管の両端開口を気密封止して
成り、さらに、上記排気管を介してＵ字管内の排気及び
放電ガスの充填を行った後に、上記排気管を加熱溶融し
て、曲管部の外周にレンズ状の肉厚部が形成されるよう
に封じ切ることを特徴とする冷陰極放電管の製造方法。 1. An elongated glass tube open at both ends is heated
And bend near the center.
Connect and connect a pair of straight pipes and both straight pipes
Forming a U-tube with a curved tube portion, and then bending the U-tube
Heat the vicinity of the section to fuse the exhaust pipe to the outer periphery of the curved pipe section,
Connect a pair of discharge electrodes to which the lead terminals are connected
Both ends of the U-tube so that one end of the child is located outside the U-tube
After inserting from the opening, seal both ends of the U-shaped tube airtightly
And furthermore, the exhaust in the U-shaped pipe through the exhaust pipe and
After filling the discharge gas, the exhaust pipe was heated and melted.
So that a lens-shaped thick part is formed on the outer periphery of the curved pipe part.
A method for producing a cold cathode discharge tube, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28784395A JP2879417B2 (en) | 1995-10-09 | 1995-10-09 | Manufacturing method of cold cathode discharge tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28784395A JP2879417B2 (en) | 1995-10-09 | 1995-10-09 | Manufacturing method of cold cathode discharge tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09106785A JPH09106785A (en) | 1997-04-22 |
| JP2879417B2 true JP2879417B2 (en) | 1999-04-05 |
Family
ID=17722501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28784395A Expired - Fee Related JP2879417B2 (en) | 1995-10-09 | 1995-10-09 | Manufacturing method of cold cathode discharge tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2879417B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006344574A (en) * | 2005-05-09 | 2006-12-21 | Senseki Koden Kagi Kofun Yugenkoshi | Manufacturing method for multiple bend type cold-cathode tube and its structure |
-
1995
- 1995-10-09 JP JP28784395A patent/JP2879417B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09106785A (en) | 1997-04-22 |
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