【０００１】[0001]
【発明の属する技術分野】本発明は、ワープロなどＯＡ
機器、ノートパソコンなど携帯用機器、あるいは、カー
ナビゲーションなど車載用機器など表示用に液晶表示器
が採用されることが一般的な機器において、前記液晶表
示器を透過光で照明するときの光源として使用される冷
陰極蛍光灯に関するものである。The present invention relates to an OA such as a word processor.
Equipment, portable equipment such as a notebook computer, or, in general equipment in which a liquid crystal display is adopted for display such as in-vehicle equipment such as car navigation, as a light source for illuminating the liquid crystal display with transmitted light. The present invention relates to a cold cathode fluorescent lamp to be used.
【０００２】[0002]
【従来の技術】従来のこの種の冷陰極蛍光灯９０の構成
の例を示すものが図２であり、内面に蛍光体９２を塗布
しておいた、例えば直径が２ｍｍ程度のガラスチューブ
９１の両端のそれぞれに略棒状の放電電極９３を取付
け、内面に放電ガスなどを封入し、封止を行って形成さ
れるものである。2. Description of the Related Art FIG. 2 shows an example of the configuration of a conventional cold cathode fluorescent lamp 90 of this kind. A fluorescent tube 92 having an inner surface coated with a phosphor 92, for example, a glass tube 91 having a diameter of about 2 mm is shown. A substantially rod-shaped discharge electrode 93 is attached to each of both ends, a discharge gas or the like is sealed in the inner surface, and sealing is performed.
【０００３】このように形成した冷陰極蛍光灯９０は、
熱陰極の蛍光灯よりも一般的に長い寿命が期待できるも
のであるが、点灯時の放電によって、前記放電電極９３
にこの放電電極の構成物質が微粒子Ｓとなって飛散する
スパッタリング現象を生じ、この微粒子Ｓがガラスチュ
ーブ９１の内壁に付着して不透明化させ、冷陰極蛍光灯
９０の有効発光長を減少させ、冷陰極蛍光灯９０自体は
寿命的には充分使用可能であるにも係わらず、両端部の
光量低下により使用不可となる問題点を生じている。[0003] The cold cathode fluorescent lamp 90 thus formed is
In general, a longer life can be expected than a hot cathode fluorescent lamp.
In addition, a sputtering phenomenon occurs in which the constituent material of the discharge electrode is scattered as fine particles S, and the fine particles S adhere to the inner wall of the glass tube 91 to make it opaque, thereby reducing the effective emission length of the cold cathode fluorescent lamp 90, Although the cold cathode fluorescent lamp 90 itself can be used sufficiently for its life, there is a problem that the cold cathode fluorescent lamp 90 cannot be used due to a decrease in the light amount at both ends.
【０００４】この点の解決のために、図３に要部で示す
ように、それぞれの前記放電電極９３の周囲を取囲むよ
うな形状として、飛散物遮蔽リング９４を設け、放電電
極９３から飛散する微粒子をこの飛散物遮蔽リング９４
で捕捉し、ガラスチューブ９１の内壁の黒化を防止し、
冷陰極蛍光灯９０の使用時間を延長可能とする構成が提
案されている。In order to solve this problem, as shown in the main part of FIG. 3, a scattered object shielding ring 94 is provided so as to surround the periphery of each of the discharge electrodes 93, and scattered from the discharge electrode 93. The scattered particles are transferred to the scattered object shielding ring 94.
To prevent blackening of the inner wall of the glass tube 91,
A configuration has been proposed in which the use time of the cold cathode fluorescent lamp 90 can be extended.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前記飛
散物遮蔽リング９４は、製造工程の簡素化、取付けの容
易化などの目的で金属部材で形成するときには、前記放
電電極９３とは電気的に絶縁を行わないと、この飛散物
遮蔽リング９４自体が放電電極の作用を行うものと成
り、微粒子を飛散させるものと成って、より一層に管壁
の黒化を助長させるものと成る。However, the scattered object shielding ring 94 is electrically insulated from the discharge electrode 93 when it is formed of a metal member for the purpose of simplifying the manufacturing process and facilitating the mounting. If this is not performed, the scattered object shielding ring 94 itself functions as a discharge electrode, and scatters fine particles, further promoting blackening of the tube wall.
【０００６】従って、図３にも示すように、前記飛散物
遮蔽リング９４を取付けるためのアンカー９５を設け、
放電電極９３との絶縁を行うことが必要となるが、現状
の直径が２ｍｍ程度のガラスチューブ９１においては、
前記アンカー９５を設けるための寸法的な余裕はすでに
なく、到底に実施不可能であるので、結果的には冷陰極
蛍光灯９０が短命なものと成り、この点の解決が課題と
されるものと成っている。Therefore, as shown in FIG. 3, an anchor 95 for mounting the flying object shielding ring 94 is provided.
It is necessary to perform insulation from the discharge electrode 93, but in the current glass tube 91 having a diameter of about 2 mm,
Since there is no dimensional allowance for providing the anchor 95 and it is impossible to implement it at all, the cold-cathode fluorescent lamp 90 is short-lived as a result. It is made.
【０００７】[0007]
【課題を解決するための手段】本発明は、前記した従来
の課題を解決するための具体的手段として、放電電極の
周囲を取囲み飛散物遮蔽リングが設けられて成る冷陰極
蛍光灯において、前記放電電極と飛散物遮蔽リングとは
二次電子放出係数が異なる部材を用いて形成され、前記
放電電極は前記飛散物遮蔽リングよりも高い二次電子放
出係数を有する部材が採用されていることを特徴とする
冷陰極蛍光灯を提供することで課題を解決するものであ
る。According to the present invention, as a specific means for solving the above-mentioned conventional problems, there is provided a cold cathode fluorescent lamp comprising a scattered object shielding ring surrounding a discharge electrode. The discharge electrode and the scattered object shielding ring are formed using members having different secondary electron emission coefficients, and the discharge electrode is a member having a higher secondary electron emission coefficient than the scattered object shielding ring. The problem is solved by providing a cold cathode fluorescent lamp characterized by the following.
【０００８】[0008]
【発明の実施の形態】つぎに、本発明を図に示す実施形
態に基づいて詳細に説明する。図１は本発明に係る冷陰
極蛍光灯１を要部で示す断面図であり、この冷陰極蛍光
灯１は、内面に蛍光体２ａが塗布された、直径２ｍｍ、
あるいは、それ以下のガラスチューブ２と、前記ガラス
チューブ２の両端に取付けられる放電電極３と、図示は
省略するが両端が封止されたガラスチューブ２に封入さ
れる放電ガスとから成るものであることは、従来例のも
のと同様である。Next, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing a main part of a cold cathode fluorescent lamp 1 according to the present invention. The cold cathode fluorescent lamp 1 has a phosphor 2a coated on its inner surface, a diameter of 2 mm,
Alternatively, it is composed of a glass tube 2 smaller than the above, a discharge electrode 3 attached to both ends of the glass tube 2, and a discharge gas (not shown) sealed in the glass tube 2 having both ends sealed. This is the same as in the conventional example.
【０００９】ここで、本発明においては、上記したよう
にガラスチューブ２の直径が２ｍｍ程度と極めて細いも
のであり、アンカーなどを放電電極３との絶縁手段を設
ける寸法的な余裕がないにも係わらず、飛散物遮蔽リン
グ４の取付けを可能とするものである。Here, in the present invention, as described above, the diameter of the glass tube 2 is extremely small, about 2 mm, so that there is no dimensional margin for providing an anchor or the like with insulating means for the discharge electrode 3. Regardless, the scattered object shielding ring 4 can be attached.
【００１０】以下に、前記飛散物遮蔽リング４を設ける
ための構成について詳細に説明を行う。本発明では、金
属部材あるいは半導体部材であっても、同一条件下で放
電を生じやすい部材と、放電を生じにくい部材とが存在
することに着目したものであり、この放電の生じ易さ
は、その部材に固有の二次電子放出係数（γ）に依存す
る。Hereinafter, a configuration for providing the scattered object shielding ring 4 will be described in detail. In the present invention, even in the case of a metal member or a semiconductor member, attention is paid to the fact that there are a member that easily generates a discharge under the same conditions and a member that does not easily generate a discharge. It depends on the secondary electron emission coefficient (γ) specific to the member.
【００１１】そして、冷陰極蛍光灯１においても、二次
電子放出係数（γ）の高い部材で放電電極３を形成し、
二次電子放出係数（γ）の低い部材で飛散物遮蔽リング
４を形成しておけば、その両者３、４を同じ導入線５に
接続し、両者３、４が導電にとなる状態でも、二次電子
放出係数（γ）が高い部材、即ち、放電電極３に放電が
集中し、飛散物遮蔽リング４からはほとんど放電が行わ
れないものであることを発明者は確認した。In the cold cathode fluorescent lamp 1, the discharge electrode 3 is formed of a member having a high secondary electron emission coefficient (γ).
If the scattered matter shielding ring 4 is formed of a member having a low secondary electron emission coefficient (γ), even if the two 3, 4 are connected to the same introduction wire 5 and both 3, 4 are conductive, The inventor has confirmed that a discharge is concentrated on a member having a high secondary electron emission coefficient (γ), that is, a discharge is concentrated on the discharge electrode 3 and a discharge is hardly performed from the scattered matter shielding ring 4.
【００１２】従って、本発明によれば、前記飛散物遮蔽
リング４は所定の形状を得るための加工が煩雑となるセ
ラミックなど非金属で飛散物遮蔽リング４を形成する必
要もなく、所定位置に取付けを行う際にもアンカーなど
を設けて放電電極３と電気的絶縁を行う必要もなく、更
には、前記導入線５に取付ける際にもスポット溶接（抵
抗溶接）など簡素な手段で良いものと成るので、それ程
のコストアップを生じることなく実施が可能である。Therefore, according to the present invention, the scattered object shielding ring 4 does not need to be formed of a non-metallic material such as ceramic, which makes the processing for obtaining a predetermined shape complicated, and the scattered object shielding ring 4 is located at a predetermined position. It is not necessary to provide an anchor or the like to electrically insulate the discharge electrode 3 when mounting, and also to use a simple means such as spot welding (resistance welding) when mounting to the introduction wire 5. Therefore, the present invention can be implemented without increasing the cost.
【００１３】ここで、前記した二次電子放出係数（γ）
の高い部材、低い部材のそれぞれについて具体的に述べ
れば、先ず、高い部材としては、第１群として、アルカ
リ土類酸化物、例えば、ＢａＯ，ＢａＬａ２Ｏ４などが
挙げられ、第２群として、希土類酸化物、例えば、Ｓｃ
２Ｏ３，Ｙ２Ｏ３，Ｌａ２Ｏ３などが挙げられる。尚、
この第２群においては、完全酸化物では絶縁体化するた
め、放電電極３としては採用し得ないが、酸素欠乏状態
では半導体化するので、この状態で放電電極３として採
用するものである。Here, the aforementioned secondary electron emission coefficient (γ)
Specifically, each of the high members and the low members will be described first. As the high members, alkaline earth oxides such as BaO and BaLa2 O4 are cited as a first group, and as a second group. , Rare earth oxides such as Sc
2 O3 , Y2 O3 , La2 O3 and the like. still,
In the second group, since the complete oxide turns into an insulator, it cannot be used as the discharge electrode 3. However, since it becomes a semiconductor in an oxygen-deficient state, it is used as the discharge electrode 3 in this state.
【００１４】更に、第３群としては、希土類水素化物、
例えば、ＳｃＨ２，ＹＨ２，ＬａＨ２などが挙げられ、
また、その他の二次電子放出係数（γ）の高い部材とし
ては、トリエーテッド・タングステンなどが挙げられ
る。上記に対してより低い二次電子放出係数（γ）を有
する部材としては、例えばＦｅ，Ｎｉなどの金属が挙げ
られる。Further, the third group includes rare earth hydrides,
For example, ScH2, YH2, LaH2And the like,
Other members having a high secondary electron emission coefficient (γ)
Include tungsten and tungsten.
You. Has a lower secondary electron emission coefficient (γ)
Examples of the member to be formed include metals such as Fe and Ni.
Can be
【００１５】上記の組合せであれば、放電電極３と飛散
物遮蔽リング４とを同じ導入線５に固着し、放電電極３
と飛散物遮蔽リング４とが同電位と成る状態において
も、電子放出は二次電子放出係数（γ）の高い放電電極
３の側で行われるものと成り、飛散物遮蔽リング４では
電子放出が行われないものと成るので、飛散物遮蔽リン
グ４が飛散物を生じることはない。In the above combination, the discharge electrode 3 and the scattered matter shielding ring 4 are fixed to the same lead-in line 5, and the discharge electrode 3
Even in a state where the potential of the scattered object shielding ring 4 is the same as that of the scattered object shielding ring 4, the electron emission is performed on the side of the discharge electrode 3 having a high secondary electron emission coefficient (γ). Since it is not performed, the flying object shielding ring 4 does not generate flying objects.
【００１６】尚、本発明の実際に実施に当って、前記放
電電極３は、全体を上記した二次電子放出係数（γ）の
高い部材で形成する必要はなく、例えば、蒸着、スパッ
タリングなど適宜な成膜方法により、例えば鉄、ニッケ
ルなど金属部材の表面に二次電子放出係数（γ）の高い
部材を成膜し覆ったものとしても良い。In the practice of the present invention, the discharge electrode 3 does not need to be formed entirely of the above-described member having a high secondary electron emission coefficient (γ). For example, a member having a high secondary electron emission coefficient (γ) may be formed on the surface of a metal member such as iron or nickel by a simple film forming method.
【００１７】[0017]
【発明の効果】以上に説明したように本発明により、放
電電極の周囲を取囲み飛散物遮蔽リングが設けられて成
る冷陰極蛍光灯において、前記放電電極と飛散物遮蔽リ
ングとは二次電子放出係数が異なる部材を用いて形成さ
れ、前記放電電極は前記飛散物遮蔽リングよりも高い二
次電子放出係数を有する部材が採用されている冷陰極蛍
光灯としたことで、放電電極と飛散物遮蔽リングとが同
電位と成る状態においても、電子放出が二次電子放出係
数（γ）の高い放電電極の側で行われるものとして、同
一の導入線に放電電極と飛散物遮蔽リングとを固着させ
ることを可能とし、例えばアンカーなどを設ける必要を
なくして、直径が２ｍｍ以下という極細の冷陰極蛍光灯
においても飛散物遮蔽リングの具備を可能とし、端部で
の黒化を生じないものとして、この種の冷陰極蛍光灯の
使用可能時間の延長に極めて優れた効果を奏するもので
ある。As described above, according to the present invention, in a cold cathode fluorescent lamp having a scattered object shielding ring surrounding a discharge electrode, the discharge electrode and the scattered object shielding ring are provided with secondary electrons. The discharge electrode is formed using a member having a different emission coefficient, and the discharge electrode is a cold cathode fluorescent lamp in which a member having a higher secondary electron emission coefficient than the scattered object shielding ring is used. Even when the shield ring and the shield ring have the same potential, the discharge electrode and the scattered object shield ring are fixed to the same lead-in line, assuming that electron emission is performed on the discharge electrode side with a high secondary electron emission coefficient (γ). For example, it is not necessary to provide an anchor or the like, and it is possible to provide a scattered object shielding ring even in an ultra-fine cold cathode fluorescent lamp having a diameter of 2 mm or less, and does not cause blackening at the end. As the one in which exhibits an extremely excellent effect to the extension of the available time of this type of cold cathode fluorescent lamps.
【００１８】また、上記の実施に当り、飛散物遮蔽リン
グには鉄（Ｆｅ）、ニッケル（Ｎｉ）など加工性に優
れ、且つ、入手も容易な金属部材の採用を可能とし、プ
レス加工、抵抗溶接による取付け加工など、簡便な工程
での組立を可能として、上記飛散物遮蔽リングを設ける
に当り、製品のコストアップを最低限とし、市場性を失
うことのないものとする優れた効果も奏するものであ
る。In the above-mentioned embodiment, the scattered object shielding ring can be made of a metal member which is excellent in workability such as iron (Fe) and nickel (Ni) and can be easily obtained. It is possible to assemble in a simple process such as attachment processing by welding, and in providing the above scattered object shielding ring, there is also an excellent effect of minimizing product cost increase and losing marketability. Things.
【図１】 本発明に係る冷陰極蛍光灯の実施形態を要部
で示す断面図である。FIG. 1 is a cross-sectional view showing a main part of an embodiment of a cold cathode fluorescent lamp according to the present invention.
【図２】 従来例を要部で示す断面図である。FIG. 2 is a cross-sectional view showing a main part of a conventional example.
【図３】 別の従来例を要部で示す断面図である。FIG. 3 is a cross-sectional view showing a main part of another conventional example.
１……冷陰極蛍光灯 ２……ガラスチューブ ２ａ……蛍光体 ３……放電電極 ４……飛散物遮蔽リング ５……導入線 DESCRIPTION OF SYMBOLS 1 ... Cold cathode fluorescent lamp 2 ... Glass tube 2a ... Phosphor 3 ... Discharge electrode 4 ... Scattering object shielding ring 5 ... Introduction line
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000173293AJP2001351572A (en) | 2000-06-09 | 2000-06-09 | Cold cathode fluorescent lamp |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000173293AJP2001351572A (en) | 2000-06-09 | 2000-06-09 | Cold cathode fluorescent lamp |
| Publication Number | Publication Date |
|---|---|
| JP2001351572Atrue JP2001351572A (en) | 2001-12-21 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000173293APendingJP2001351572A (en) | 2000-06-09 | 2000-06-09 | Cold cathode fluorescent lamp |
| Country | Link |
|---|---|
| JP (1) | JP2001351572A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005027181A1 (en)* | 2003-09-15 | 2005-03-24 | Colour Star Limited | Cold-cathode fluorescent lamp with electrode cap |
| DE10336228B4 (en)* | 2002-08-08 | 2011-03-24 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Kobe-shi | Ag alloy based thin film, use of this film and manufacturing process for this film |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10336228B4 (en)* | 2002-08-08 | 2011-03-24 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Kobe-shi | Ag alloy based thin film, use of this film and manufacturing process for this film |
| DE10362283B4 (en) | 2002-08-08 | 2018-05-30 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Production method for Ag alloy based film and sputtering target |
| DE10362302B4 (en) | 2002-08-08 | 2019-07-18 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Electromagnetic shielding film product and manufacturing method therefor |
| WO2005027181A1 (en)* | 2003-09-15 | 2005-03-24 | Colour Star Limited | Cold-cathode fluorescent lamp with electrode cap |
| US6963164B2 (en) | 2003-09-15 | 2005-11-08 | Colour Star Limited | Cold cathode fluorescent lamps |
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