JP2003007252A - Cold cathode fluorescent lamp and lighting system - Google Patents
Cold cathode fluorescent lamp and lighting systemInfo
- Publication number
- JP2003007252A JP2003007252A JP2001184798A JP2001184798A JP2003007252A JP 2003007252 A JP2003007252 A JP 2003007252A JP 2001184798 A JP2001184798 A JP 2001184798A JP 2001184798 A JP2001184798 A JP 2001184798A JP 2003007252 A JP2003007252 A JP 2003007252A
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent lamp
- arc tube
- cold cathode
- cathode fluorescent
- glass arc
- 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.)
- Pending
Links
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- 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、冷陰極蛍光ランプ
に係り、さらに詳しくは液晶ディスプレイ、計器用表示
パネル、スキャナーなどの光源に適する冷陰極蛍光ラン
プ及び照明装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold cathode fluorescent lamp, and more particularly to a cold cathode fluorescent lamp and a lighting device suitable for light sources such as liquid crystal displays, instrument display panels and scanners.
【0002】[0002]
【従来の技術】パーソナルコンピューター、ワードプロ
セッサー、液晶テレビなどの液晶ディスプレイにおいて
は、バックライト用光源として点灯作動に伴う温度上昇
の小さい冷陰極蛍光ランプが使用されている。すなわ
ち、図3に要部構成を横断面的に示すように、内壁面に
蛍光体膜1が形成され、かつ放電媒体が封入されたガラ
ス発光管2、前記ガラス発光管2の両端部に対向して封
入・配置された一対の放電電極3a,3b、及び前記放
電電極3a,3bに一端が接続し他端がガラス発光管2
外に気密に封止・導出された給電用リード線4a,4b
を有する冷陰極蛍光ランプが使用されている。2. Description of the Related Art In a liquid crystal display such as a personal computer, a word processor and a liquid crystal television, a cold cathode fluorescent lamp, which has a small temperature rise due to lighting operation, is used as a light source for a backlight. That is, as shown in the cross-sectional view of the main configuration in FIG. 3, a glass luminous tube 2 having a phosphor film 1 formed on its inner wall surface and a discharge medium sealed therein, and facing both ends of the glass luminous tube 2. And a pair of discharge electrodes 3a and 3b enclosed and arranged, and one end is connected to the discharge electrodes 3a and 3b and the other end is the glass arc tube 2.
Power supply lead wires 4a and 4b which are hermetically sealed and led out to the outside.
A cold cathode fluorescent lamp having
【0003】ここで、ガラス発光管2は、たとえば外径
1.2〜10.0mm程度、長さ50〜600mm程度
であり、また、放電媒体は、キセノン,アルゴン,ネオ
ンなど1種以上の希ガス、もしくは1種以上の前記希ガ
スと水銀との混合系である。Here, the glass arc tube 2 has, for example, an outer diameter of about 1.2 to 10.0 mm and a length of about 50 to 600 mm, and the discharge medium is one or more rare substances such as xenon, argon and neon. It is a gas or a mixed system of one or more rare gases and mercury.
【0004】そして、この種の冷陰極蛍光ランプは、給
電用リード線4a,4bを介して放電電極3a,3b
に、所要の高周波電圧(たとえば20〜100KHz、
1〜2KVの電圧)を印加すると、放電電極3a,3b
間に放電が開始し、ガラス発光管2内で紫外線を放射す
る。こうして放射された紫外線が、ガラス発光管2内壁
面の蛍光体膜1によって可視光に変換され、光源として
機能する。In this type of cold cathode fluorescent lamp, the discharge electrodes 3a and 3b are connected via the power supply lead wires 4a and 4b.
A required high frequency voltage (for example, 20 to 100 KHz,
When a voltage of 1-2 KV) is applied, the discharge electrodes 3a, 3b
In the meantime, discharge starts and ultraviolet rays are radiated in the glass arc tube 2. The ultraviolet light thus radiated is converted into visible light by the phosphor film 1 on the inner wall surface of the glass arc tube 2 and functions as a light source.
【0005】上記冷陰極蛍光ランプは、寿命も長いなど
の特長を有するが、液晶ディスプレイの高性能化に伴っ
て、バックライト用光源に使用される冷陰極蛍光ランプ
の、さらなる高性能化が望まれている。この高性能化の
一手段として、ガラス発光管2の内壁面(蛍光体膜1と
の間)、もしくはガラス発光管2の外周面に、可視光は
透過するが紫外線を反射ないし遮断する金属酸化物層
(膜)を設けて、紫外線を効率よく利用して、発光を高
めることが知られている。The above-mentioned cold cathode fluorescent lamp has a feature that it has a long life and the like, but as the performance of the liquid crystal display becomes higher, further improvement in the performance of the cold cathode fluorescent lamp used as the light source for the backlight is desired. It is rare. As one means for improving the performance, metal oxide that transmits visible light but reflects or blocks ultraviolet rays is used on the inner wall surface of the glass arc tube 2 (between the phosphor film 1) and the outer peripheral surface of the glass arc tube 2. It is known that a material layer (film) is provided and ultraviolet rays are efficiently used to enhance light emission.
【0006】[0006]
【発明が解決しようとする課題】しかし、上記冷陰極蛍
光ランプの高性能化手段は、実用的に、なお十分な対応
策といえない。すなわち、ガラス発光管2の内壁面(蛍
光体膜1との間)に、可視光は透過するが紫外線を反射
もしくは遮断する金属酸化物層(膜)を設けた構成、あ
るいはガラス発光管2の外周面に、同じく可視光は透過
するが紫外線を反射もしくは遮断する金属酸化物層
(膜)を設けた構成のいずれの場合も、紫外線の反射や
遮断が不十分で、結果的に、十分な発光効率の向上など
を達成できないと言う問題がある。However, the above-mentioned means for improving the performance of the cold cathode fluorescent lamp is not a practically sufficient countermeasure. That is, a structure in which a metal oxide layer (film) that transmits visible light but reflects or blocks ultraviolet light is provided on the inner wall surface of the glass arc tube 2 (between the phosphor film 1) or the glass arc tube 2 In any case where the outer peripheral surface is provided with a metal oxide layer (film) that also transmits visible light but reflects or blocks ultraviolet rays, the ultraviolet rays are not sufficiently reflected or blocked, resulting in sufficient There is a problem that improvement of luminous efficiency cannot be achieved.
【0007】また、上記紫外線の反射や遮断が不十分で
あるという問題は、ガラス発光管2のガラス壁自体の変
色を招来する。つまり、蛍光体膜1で変換された可視光
がガラス発光管2壁を透過・照射し、光源の作用をする
蛍光ランプにおいて、前記ガラス発光管2壁の変色は、
透光性の低下などを招来することになるため、結果的
に、照射光量の低減となって、発光効率の向上を達成で
きないと言う問題を提起する。The problem of insufficient reflection or blocking of the ultraviolet rays causes discoloration of the glass wall itself of the glass arc tube 2. That is, in the fluorescent lamp that the visible light converted by the phosphor film 1 transmits / illuminates the wall of the glass arc tube 2 to act as a light source, the discoloration of the wall of the glass arc tube 2 is
This leads to a decrease in translucency, which results in a reduction in the amount of irradiation light and raises the problem that improvement in light emission efficiency cannot be achieved.
【0008】さらに、上記紫外線の反射や遮断が不十分
であることは、この種の冷陰極蛍光ランプを設置する領
域、たとえば液晶表示装置のバックライトユニット、デ
ィスプレイ、あるいは照明装置の周辺部材の劣化を招来
すると言う問題を招来する。すなわち、冷陰極蛍光ラン
プの設置領域において、たとえば合成樹脂製の構成部材
は、紫外線の照射によって劣化するため、周辺部材の耐
久性ないし寿命が損なわれ易い恐れがある。Further, the insufficient reflection or blocking of the ultraviolet rays results in deterioration of the area in which this type of cold cathode fluorescent lamp is installed, for example, a backlight unit of a liquid crystal display device, a display, or peripheral members of a lighting device. Invite the problem of calling. That is, in the installation area of the cold cathode fluorescent lamp, the constituent members made of synthetic resin, for example, are deteriorated by the irradiation of ultraviolet rays, and therefore the durability or life of the peripheral members may be easily impaired.
【0009】本発明は、上記事情に鑑みてなされたもの
で、ガラス発光管内における放射紫外線の利用効率アッ
プによる光量の向上を図るとともに、放射紫外線による
周辺部材の損傷・劣化を防止する冷陰極蛍光ランプ、及
び照明装置の提供を目的とする。The present invention has been made in view of the above circumstances, and aims to improve the amount of light by increasing the utilization efficiency of radiated ultraviolet rays in a glass arc tube and to prevent damage and deterioration of peripheral members due to radiated ultraviolet rays. An object is to provide a lamp and a lighting device.
【0010】[0010]
【課題を解決するための手段】請求項1の発明は、内壁
面に蛍光体膜が形成され、かつ放電媒体が封入されたガ
ラス発光管、前記ガラス発光管の両端部に対向して封入
配置された一対の放電電極、及び前記放電電極に一端が
接続し他端がガラス発光管外に気密に封止・導出された
給電用リード線を有する冷陰極蛍光ランプであって、前
記ガラス発光管内壁面の蛍光体膜は紫外線を反射する金
属酸化物膜を介して設けられ、また、ガラス発光管の外
周面に紫外線を遮断する金属酸化物膜が設けられている
ことを特徴とする冷陰極蛍光ランプである。According to a first aspect of the present invention, there is provided a glass arc tube in which a phosphor film is formed on an inner wall surface and a discharge medium is sealed therein, and a glass arc tube is disposed so as to face both ends of the glass arc tube. A pair of discharge electrodes, and a cold cathode fluorescent lamp having one end connected to the discharge electrode and the other end hermetically sealed and led out to the outside of the glass arc tube to supply electric power, wherein the inside of the glass arc tube The fluorescent film on the wall is provided through a metal oxide film that reflects ultraviolet rays, and a metal oxide film that blocks ultraviolet rays is provided on the outer peripheral surface of the glass arc tube. It is a lamp.
【0011】請求項2の発明は、請求項1記載の冷陰極
蛍光ランプにおいて、ガラス発光管外周面の金属酸化物
膜厚が、ガラス発光管内壁面の金属酸化物膜よりも膜厚
に設定されていることを特徴とする。According to a second aspect of the present invention, in the cold cathode fluorescent lamp according to the first aspect, the metal oxide film thickness on the outer peripheral surface of the glass arc tube is set to be thicker than the metal oxide film on the inner wall surface of the glass arc tube. It is characterized by
【0012】請求項3の発明は、請求項1もしくは請求
項2記載の冷陰極蛍光ランプにおいて、ガラス発光管外
周面の金属酸化物膜の管軸方向長さがガラス発光管内壁
面の金属酸化物膜の管軸方向長よりも長く設定されてい
ることを特徴とする。According to a third aspect of the present invention, in the cold cathode fluorescent lamp according to the first or second aspect, the length of the metal oxide film on the outer peripheral surface of the glass arc tube in the axial direction is the metal oxide on the inner wall surface of the glass arc tube. It is characterized in that it is set longer than the length of the membrane in the tube axis direction.
【0013】請求項4の発明は、請求項1ないし請求項
3記載の冷陰極蛍光ランプにおいて、ガラス発光管の内
径が6mm以下であることを特徴とする。According to a fourth aspect of the present invention, in the cold cathode fluorescent lamp according to the first to third aspects, the inner diameter of the glass arc tube is 6 mm or less.
【0014】請求項5の発明は、請求項1ないし請求項
4いずれか一記載の冷陰極蛍光ランプにおいて、金属酸
化物膜がAl2O3,TiO2,SiO2,ZnO,Y
2O 3,CeO2の群から選ばれた少なくとも1種で形
成されていることを特徴とする。The invention of claim 5 is defined by claim 1 to claim 1.
4. In the cold cathode fluorescent lamp according to any one of 4),
Oxide film is AlTwoOThree, TiOTwo, SiOTwo, ZnO, Y
TwoO Three, CeOTwoFormed by at least one selected from the group
It is characterized by being made.
【0015】請求項6の発明は、蛍光ランプの給電用リ
ード線に接続する接続端子を有する照明器具と、前記照
明器具に装着された蛍光ランプとを有する照明装置であ
って、蛍光ランプが請求項1ないし請求項5いずれか一
記載の冷陰極蛍光ランプであることを特徴とする照明装
置である。According to a sixth aspect of the present invention, there is provided a lighting device including a lighting device having a connection terminal connected to a power supply lead wire of the fluorescent lamp, and a fluorescent lamp mounted on the lighting device. An illumination device, which is the cold cathode fluorescent lamp according to any one of claims 1 to 5.
【0016】請求項1ないし5の発明において、発光管
を成すガラス管は、一般的に、外径1.2〜10.0m
m程度、好ましくは2〜6mm程度、肉厚0.2〜0.
6mm程度、長さ50〜600mm程度のガラス管であ
る。また、このガラス管内に封入される放電媒体は、た
とえばネオンガス,アルゴンガス,キセノンガス,キセ
ノンガスを主体とした混合希ガスなどの希ガス類、ある
いはこれらの希ガスと水銀との混合系が挙げられる。な
お、この放電媒体の封入量は、この種の冷陰極蛍光ラン
プの場合と同様である。In the invention of claims 1 to 5, the glass tube forming the arc tube generally has an outer diameter of 1.2 to 10.0 m.
m, preferably 2 to 6 mm, and a wall thickness of 0.2 to 0.
It is a glass tube having a length of about 6 mm and a length of about 50 to 600 mm. The discharge medium sealed in the glass tube is, for example, a rare gas such as neon gas, argon gas, xenon gas, or a mixed rare gas mainly composed of xenon gas, or a mixed system of these rare gases and mercury. The amount of the discharge medium enclosed is the same as in the case of this type of cold cathode fluorescent lamp.
【0017】請求項1ないし5の発明において、ガラス
管内壁面及びガラス管外周面に設けられる紫外線を反射
する金属酸化物膜は、たとえばAl2O3,TiO2,
SiO2,ZnO,Y2O3,CeO2の群から選ばれ
た1種、もしくは2種以上の混合系、たとえば可視光は
透過するがAl2O3−TiO2で形成される。なお、
ガラス管外周面の金属酸化物膜は、ガラス管外に紫外線
が放射されるのを回避ないし防止するものであるから、
紫外線を遮断する機能を呈するものである。つまり、紫
外線を反射もしくは吸収する膜である。In the invention of claims 1 to 5, the metal oxide film provided on the inner wall surface of the glass tube and the outer peripheral surface of the glass tube for reflecting ultraviolet rays is formed of, for example, Al 2 O 3 , TiO 2 ,
SiO 2, ZnO, Y 2 O 3, 1 kind selected from the group consisting of CeO 2, or a mixture of two or more systems, such as visible light is transmitted is formed by Al 2 O 3 -TiO 2. In addition,
Since the metal oxide film on the outer peripheral surface of the glass tube is to prevent or prevent ultraviolet rays from being emitted to the outside of the glass tube,
It exhibits a function of blocking ultraviolet rays. That is, it is a film that reflects or absorbs ultraviolet rays.
【0018】ここで、ガラス管内壁面の金属酸化物膜の
形成は、蛍光体膜を形成する領域であり、また、ガラス
管外周面の金属酸化物膜の形成は、前記蛍光体膜を形成
する領域よりも外方に伸び(延設)、ガラス管外周面全
体に及んでいることが望ましい。そして、これらガラス
管内壁面の金属酸化物膜厚、及びガラス管外周面の金属
酸化物膜厚は、特に、限定されないが、一般的には、前
者の膜厚を1μm程度、後者の膜厚を1〜5μm程度と
することが好ましい。なお、ガラス管内壁面に、前記紫
外線反射膜を介して設けられている蛍光体膜は、通常、
この種の蛍光ランプで使用されている蛍光体で形成され
る。Here, the formation of the metal oxide film on the inner wall surface of the glass tube is an area where the phosphor film is formed, and the formation of the metal oxide film on the outer peripheral surface of the glass tube forms the phosphor film. It is desirable to extend (extend) outward from the region and extend to the entire outer peripheral surface of the glass tube. The metal oxide film thickness on the inner wall surface of the glass tube and the metal oxide film thickness on the outer peripheral surface of the glass tube are not particularly limited, but generally, the former film thickness is about 1 μm and the latter film thickness is about 1 μm. It is preferably about 1 to 5 μm. Incidentally, the inner wall surface of the glass tube, the phosphor film provided via the ultraviolet reflection film, usually,
It is formed of the phosphor used in this type of fluorescent lamp.
【0019】請求項1ないし5の発明において、ガラス
発光管内に封入配置される放電電極は、たとえばNiや
Ni合金などNi系金属をとした外径0.6〜2.0m
m程度、長さ2〜5mm程度の円筒体もしくは円柱体
で、供給用リード線は、溶接などで接続されている。な
お、放電電極は、電子放出性物質(エミツタ)を担持し
た構成を採る場合もあり、また、ガラス管内における封
装・配置は、一般的に、ガラス管に対して同心円的であ
る。In the first to fifth aspects of the invention, the discharge electrode sealed in the glass arc tube is made of Ni-based metal such as Ni or Ni alloy and has an outer diameter of 0.6 to 2.0 m.
A cylindrical body or a cylindrical body having a length of about m and a length of about 2 to 5 mm, and the supply lead wires are connected by welding or the like. The discharge electrode may have a structure in which an electron-emitting substance (emitter) is carried, and the sealing / arrangement in the glass tube is generally concentric with the glass tube.
【0020】請求項6の発明において、照明器具は、こ
の種の蛍光ランプを光源として点灯動作を行う一般的な
蛍光ランプ用の照明器具ならば、特に、限定されない。
勿論、照明器具は、用途・目的に対応して選択される。In the invention of claim 6, the luminaire is not particularly limited as long as it is a general luminaire for a fluorescent lamp that performs a lighting operation using this type of fluorescent lamp as a light source.
Of course, the luminaire is selected according to the use and purpose.
【0021】請求項1ないし6の発明では、ガラス発光
管の内壁面に可視光透過性で紫外線反射性の、また、ガ
ラス管外周面に可視光透過性で紫外線遮断性の金属酸化
物膜が、それぞれ設けられている。したがって、給電用
リード線を介して放電電極に、所要の高周波電圧を印加
した際、放電電極間の放電に伴って放射された紫外線
が、効率よく、内壁面の蛍光体膜によって可視光に変換
される。According to the first to sixth aspects of the present invention, the inner wall surface of the glass arc tube is provided with a visible light-transmitting and ultraviolet-reflecting metal oxide film, and the outer surface of the glass tube is provided with a visible light-transmitting and ultraviolet-blocking metal oxide film. , Respectively. Therefore, when a required high-frequency voltage is applied to the discharge electrodes via the power supply lead wires, the ultraviolet rays emitted by the discharge between the discharge electrodes are efficiently converted into visible light by the phosphor film on the inner wall surface. To be done.
【0022】つまり、蛍光体膜を透過した紫外線は、基
本的にガラス管内壁面で反射し、再び蛍光体膜側に戻さ
れ、蛍光体膜で可視光に変換されるため、光量の向上が
図られるし、また、ガラス管自体の変色・劣化も防止さ
れる。一方、ガラス管壁を透過した紫外線は、ガラス管
外周面からの放射が阻止・遮断される。したがって、周
辺領域に対する紫外線の照射が抑制・防止され、紫外線
による周辺部材の劣化が回避・解消される。That is, since the ultraviolet rays transmitted through the phosphor film are basically reflected by the inner wall surface of the glass tube, returned to the phosphor film side and converted into visible light by the phosphor film, the amount of light can be improved. In addition, discoloration / deterioration of the glass tube itself is prevented. On the other hand, the ultraviolet rays transmitted through the glass tube wall are blocked or blocked from being radiated from the outer peripheral surface of the glass tube. Therefore, the irradiation of the peripheral region with the ultraviolet rays is suppressed / prevented, and the deterioration of the peripheral members due to the ultraviolet rays is avoided or eliminated.
【0023】[0023]
【発明の実施形態】以下、図1及び図2を参照して実施
例を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS.
【0024】図1は、実施例に係る冷陰極蛍光ランプの
要部構成を示す横断面図である。図1において、5は発
光管として機能する気密封止のガラス管、6は前記ガラ
ス管5内壁面に設けられた可視光透過で紫外線反射性の
金属酸化物膜、7は前記金属酸化物膜6面上に設けられ
た蛍光体膜である。ここで、ガラス管5は、たとえば外
径2〜10mm、長さ50〜600mm程度で、放電媒
体としての希ガス、たとえばキセノンガスを主体とした
希ガス、もしくは希ガスと水銀との混合系が封入されて
いる。また、金属酸化物膜6は、たとえばAl2O3を
少量含有させたTiO2系であり、その厚さは約1μm
程度である。FIG. 1 is a cross-sectional view showing the structure of the essential parts of a cold cathode fluorescent lamp according to an embodiment. In FIG. 1, 5 is a hermetically sealed glass tube that functions as an arc tube, 6 is a visible-light-transmitting and ultraviolet-reflecting metal oxide film provided on the inner wall surface of the glass tube 5, and 7 is the metal oxide film. It is a phosphor film provided on six surfaces. Here, the glass tube 5 has, for example, an outer diameter of 2 to 10 mm and a length of 50 to 600 mm, and a rare gas as a discharge medium, for example, a rare gas mainly containing xenon gas or a mixed system of rare gas and mercury. It is enclosed. The metal oxide film 6 is, for example, a TiO 2 system containing a small amount of Al 2 O 3 and has a thickness of about 1 μm.
It is a degree.
【0025】さらに、8a,8bは前記ガラス管5内の
両端に封装された一対の放電電極、9a,9bは前記放
電電極8a,8bに一端が接続し、他端側がガラス管5
外に気密封止・導出された供給用リード線、6′は前記
ガラス管5の外周面に設けられた可視光透過で紫外線反
射性の金属酸化物膜である。ここで、放電電極8a,8
bは、たとえばNi系の一端が開口の内径2.0mm程
度、長さが4.0mm程度の円筒体で、その内外壁面に
電子放射性物質膜を設けたものである。また、供給用リ
ード線9a,9bは、たとえば径0.3〜1.0mm程
度のタングステン線、ニッケル線、鉄線、モリブデン
線、もしくはこれらの複合金属線であり、一端が円筒体
の底壁面に溶接手段で接続されている。なお、金属酸化
物膜6′は、たとえばAl2O3を少量含有させたTi
O2系であり、その厚さは約1〜5μm程度である。Further, 8a and 8b are a pair of discharge electrodes sealed at both ends in the glass tube 5, and 9a and 9b have one end connected to the discharge electrodes 8a and 8b and the other end side being the glass tube 5.
A supply lead wire 6 ′ is hermetically sealed and led out to the outside, and a metal oxide film 6 ′ provided on the outer peripheral surface of the glass tube 5 and transmitting visible light and reflecting ultraviolet rays. Here, the discharge electrodes 8a, 8
In b, for example, one end of a Ni-based material is a cylindrical body having an opening having an inner diameter of about 2.0 mm and a length of about 4.0 mm, and an electron emissive material film is provided on the inner and outer wall surfaces thereof. The supply lead wires 9a, 9b are, for example, a tungsten wire, a nickel wire, an iron wire, a molybdenum wire having a diameter of about 0.3 to 1.0 mm, or a composite metal wire thereof, one end of which is on the bottom wall surface of the cylindrical body. It is connected by welding means. The metal oxide film 6'is made of, for example, Ti containing a small amount of Al 2 O 3.
It is an O 2 system and its thickness is about 1 to 5 μm.
【0026】上記冷陰極蛍光ランプは、供給用リード線
9a,9bを介して放電電極8a,8bに所要の高周波
電圧(たとえば20〜100KHz,1〜4KVの電圧
印加)すると、放電電極8a,8b間で放電が開始し、
ガラス管5内に紫外線を放射する。こうして放射された
紫外線が、ガラス管5内壁面の蛍光体膜7によって可視
光に変換され、ガラス管5外に可視光を透過・放射す
る。In the cold cathode fluorescent lamp, when the required high frequency voltage (for example, voltage of 20 to 100 KHz, voltage of 1 to 4 KV is applied) to the discharge electrodes 8a and 8b through the supply lead wires 9a and 9b, the discharge electrodes 8a and 8b. Discharge started between
Ultraviolet rays are emitted into the glass tube 5. The ultraviolet rays thus radiated are converted into visible light by the phosphor film 7 on the inner wall surface of the glass tube 5, and the visible light is transmitted and radiated to the outside of the glass tube 5.
【0027】この点灯動作において、冷陰極蛍光ランプ
は、可視光透過で紫外線反射性の薄い金属酸化物膜6
が、ガラス管5の内壁面に設けられているため、可視光
放射に寄与する紫外線が効率的に作用し、発光量の向上
・維持が図られる。一方、ガラス管5外周面にも、可視
光透過で紫外線反射性の金属酸化物膜6′が設けられて
いるため、紫外線がガラス管5外周辺に放射されるのを
抑制・防止する。つまり、紫外線の効率的な変換による
可視光がガラス管5外に照射される一方、ガラス管5外
周辺に対する紫外線の放射が抑制されるので、紫外線の
放射によって周辺部で生じる不都合も解消される。In this lighting operation, the cold cathode fluorescent lamp has a thin metal oxide film 6 that transmits visible light and reflects ultraviolet light.
However, because it is provided on the inner wall surface of the glass tube 5, the ultraviolet rays that contribute to the emission of visible light act efficiently, and the amount of emitted light is improved and maintained. On the other hand, since the outer peripheral surface of the glass tube 5 is also provided with the metal oxide film 6'which transmits visible light and reflects ultraviolet rays, the ultraviolet rays are suppressed / prevented from being radiated to the outer periphery of the glass tube 5. That is, visible light is emitted to the outside of the glass tube 5 by efficient conversion of the ultraviolet rays, while the emission of the ultraviolet rays to the periphery of the glass tube 5 is suppressed, so that the disadvantage caused by the emission of the ultraviolet rays in the peripheral portion is also eliminated. .
【0028】たとえば、上記構成を適用した冷陰極蛍光
ランプ:管外径2.4mm、全長316mmを、対応す
るインバーター点灯回路:HIU−742Aに装着し、
点灯周波数42KHz、ランプ電流7mA、周囲温度2
5℃の条件で点灯し、点灯経過時間と輝度維持率(%)
の関係、すなわち連続点灯寿命試験を行ったところ、図
2に曲線Aで示すごとくであった。一方、比較のため、
紫外線反射膜6′をガラス管5の外周面にのみ設けた以
外は、上記と同じ規格の冷陰極蛍光ランプについて、同
一条件で連続点灯寿命試験を行ったところ、図2に曲線
aで示す傾向が確認された。なお、上記各連続点灯寿命
試験は、それぞれ5個の冷陰極蛍光ランプについての平
均値である。For example, a cold cathode fluorescent lamp to which the above configuration is applied: a tube outer diameter of 2.4 mm and a total length of 316 mm is mounted on a corresponding inverter lighting circuit: HIU-742A,
Lighting frequency 42KHz, lamp current 7mA, ambient temperature 2
Lighting at 5 ° C, elapsed lighting time and brightness maintenance rate (%)
When the continuous lighting life test was conducted, the result was as shown by the curve A in FIG. On the other hand, for comparison,
A continuous lighting life test was performed under the same conditions on a cold cathode fluorescent lamp of the same standard as above except that the ultraviolet ray reflecting film 6'was provided only on the outer peripheral surface of the glass tube 5, and the curve shown in FIG.
The tendency indicated by a is confirmed. The above continuous lighting life test is an average value for five cold cathode fluorescent lamps.
【0029】また、上記連続点灯寿命試験において、冷
陰極蛍光ランプ外周辺部に放射される紫外線の影響を併
せて評価したところ、冷陰極蛍光ランプ周辺部における
紫外線量は、実施例の冷陰極蛍光ランプの場合、比較例
の冷陰極蛍光ランプに較べて、数分の1程度であった。
つまり、冷陰極蛍光ランプの連続点灯において、紫外線
照射もしくは放射による周辺の構成部材の劣化も大幅に
低減・抑制されることが確認された。Further, in the continuous lighting life test, the effect of ultraviolet rays radiated to the peripheral portion of the cold cathode fluorescent lamp was also evaluated, and the amount of ultraviolet rays in the peripheral portion of the cold cathode fluorescent lamp was found to be the cold cathode fluorescent lamp of the embodiment. In the case of the lamp, it was about a fraction of that of the cold cathode fluorescent lamp of the comparative example.
In other words, it was confirmed that in continuous lighting of the cold cathode fluorescent lamp, the deterioration of the peripheral components due to the irradiation or irradiation of ultraviolet rays was significantly reduced or suppressed.
【0030】本発明は、上記実施例に限定されるもので
なく、発明の趣旨を逸脱しない範囲で、いろいろの変形
を採ることができる。たとえば、可視光を透過するが紫
外線を反射する金属酸化物の種類や膜厚、蛍光ランプの
寸法などは、用途などに応じて適宜選択できる。The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. For example, the type and thickness of a metal oxide that transmits visible light but reflects ultraviolet light, the dimensions of a fluorescent lamp, and the like can be appropriately selected according to the application.
【0031】[0031]
【発明の効果】請求項1ないし5の発明によれば、点灯
駆動による放電電極間の放電に伴って、放射された紫外
線が効率よく、内壁面の蛍光体膜によって可視光に変換
され、良好な連続点灯寿命を呈する冷陰極蛍光ランプを
提供できる。つまり、蛍光体膜を透過した紫外線が再び
蛍光体膜側に戻され、蛍光体膜で可視光に変換されるた
め、光量の向上が図られる。また、ガラス管自体の変色
・劣化も防止されるので長寿命化が図られる一方、ガラ
ス管外周面からの紫外線放射が遮断・阻止されるので、
周辺部材の紫外線による劣化も解消された光源が提供さ
れる。According to the first to fifth aspects of the present invention, the ultraviolet rays radiated by the discharge between the discharge electrodes due to the lighting drive are efficiently converted into visible light by the phosphor film on the inner wall surface. It is possible to provide a cold cathode fluorescent lamp that exhibits a long continuous lighting life. That is, since the ultraviolet rays that have passed through the phosphor film are returned to the phosphor film side again and converted into visible light by the phosphor film, the amount of light can be improved. Also, since the discoloration / deterioration of the glass tube itself is prevented and the service life is extended, the ultraviolet radiation from the outer peripheral surface of the glass tube is blocked / blocked.
Provided is a light source in which deterioration of peripheral members due to ultraviolet rays is eliminated.
【0032】請求項6の発明によれば、光源として装着
する冷陰極蛍光ランプの良好な連続点灯寿命が生かさ
れ、また、周辺部の構成部材の紫外線による劣化など、
紫外線放射の悪影響が解消されるので、信頼性や耐久性
の向上に寄与する照明装置が提供される。According to the sixth aspect of the present invention, the good continuous lighting life of the cold cathode fluorescent lamp mounted as the light source is utilized, and the components of the peripheral portion are deteriorated by ultraviolet rays.
Since the adverse effect of ultraviolet radiation is eliminated, a lighting device that contributes to improvement in reliability and durability is provided.
【図1】実施例に係る冷陰極蛍光ランプの概略構成を示
す断面図。FIG. 1 is a sectional view showing a schematic configuration of a cold cathode fluorescent lamp according to an embodiment.
【図2】実施例に係る冷陰極蛍光ランプの連続点灯寿命
を従来の冷陰極蛍光ランプの場合と比較して示す特性
図。FIG. 2 is a characteristic diagram showing a continuous lighting life of a cold cathode fluorescent lamp according to an example in comparison with a case of a conventional cold cathode fluorescent lamp.
【図3】従来の冷陰極蛍光ランプの概略構成を示す断面
図。FIG. 3 is a sectional view showing a schematic configuration of a conventional cold cathode fluorescent lamp.
【符号の説明】 1,7……蛍光体膜 2,5……ガラス管 3a,3b,8a,8b……放電電極 4a,4b,9a,9b……供給用リード線 6,6′……紫外線を反射する金属酸化物膜[Explanation of symbols] 1,7 ... Phosphor film 2,5 ... Glass tube 3a, 3b, 8a, 8b ... Discharge electrodes 4a, 4b, 9a, 9b ... Supply lead wire 6,6 '... Metal oxide film that reflects ultraviolet rays
Claims (6)
体が封入されたガラス発光管、前記ガラス発光管の両端
部に対向して封入配置された一対の放電電極、及び前記
放電電極に一端が接続し他端がガラス発光管外に気密に
封止・導出された給電用リード線を有する冷陰極蛍光ラ
ンプであって、 前記ガラス発光管内壁面の蛍光体膜は紫外線を反射する
金属酸化物膜を介して設けられ、また、ガラス発光管の
外周面に紫外線を遮断する金属酸化物膜が設けられてい
ることを特徴とする冷陰極蛍光ランプ。1. A glass arc tube in which a phosphor film is formed on an inner wall surface and a discharge medium is encapsulated, a pair of discharge electrodes encapsulated and arranged opposite to both ends of the glass arc tube, and the discharge electrode. A cold cathode fluorescent lamp having one end connected to the other end and the other end hermetically sealed and led to the outside of the glass arc tube to provide a power supply lead wire, wherein the phosphor film on the inner wall surface of the glass arc tube is a metal that reflects ultraviolet rays. A cold cathode fluorescent lamp, wherein the cold cathode fluorescent lamp is provided through an oxide film, and a metal oxide film that blocks ultraviolet rays is provided on the outer peripheral surface of the glass arc tube.
ラス発光管内壁面の金属酸化物膜よりも膜厚に設定され
ていることを特徴とする請求項1記載の冷陰極蛍光ラン
プ。2. The cold cathode fluorescent lamp according to claim 1, wherein the thickness of the metal oxide film on the outer peripheral surface of the glass arc tube is set to be larger than that of the metal oxide film on the inner wall surface of the glass arc tube.
方向長さがガラス発光管内壁面の金属酸化物膜の管軸方
向長よりも長く設定されていることを特徴とする請求項
1もしくは請求項2記載の冷陰極蛍光ランプ。3. The length of the metal oxide film on the outer circumferential surface of the glass arc tube in the tube axis direction is set to be longer than the length of the metal oxide film on the inner wall surface of the glass arc tube in the tube axis direction. The cold cathode fluorescent lamp according to claim 1 or claim 2.
とを特徴とする請求項1ないし請求項3いずれか一記載
の冷陰極蛍光ランプ。4. The cold cathode fluorescent lamp according to claim 1, wherein the inner diameter of the glass arc tube is 6 mm or less.
iO2,ZnO,Y2O3,CeO 2の群から選ばれた
少なくとも1種で形成されていることを特徴とする請求
項1ないし請求項4いずれか一記載の冷陰極蛍光ラン
プ。5. The metal oxide film is AlTwoOThree, TiOTwo, S
iOTwo, ZnO, YTwoOThree, CeO TwoSelected from the group of
Claims characterized by being formed of at least one kind
The cold cathode fluorescent lamp according to any one of claims 1 to 4.
Pu.
続端子を有する照明器具と、前記照明器具に装着された
蛍光ランプとを有する照明装置であって、蛍光ランプが
請求項1ないし請求項5いずれか一記載の冷陰極蛍光ラ
ンプであることを特徴とする照明装置。6. A lighting device comprising: a lighting device having a connection terminal connected to a power supply lead wire of the fluorescent lamp; and a fluorescent lamp mounted on the lighting device, wherein the fluorescent lamp is a fluorescent lamp. 5. A lighting device, which is the cold cathode fluorescent lamp according to any one of 5 above.
Priority Applications (1)
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JP2001184798A JP2003007252A (en) | 2001-06-19 | 2001-06-19 | Cold cathode fluorescent lamp and lighting system |
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Application Number | Priority Date | Filing Date | Title |
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JP2001184798A JP2003007252A (en) | 2001-06-19 | 2001-06-19 | Cold cathode fluorescent lamp and lighting system |
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Family
ID=19024500
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006179583A (en) * | 2004-12-21 | 2006-07-06 | Ushio Inc | Flash radiator |
US7550911B2 (en) | 2005-05-13 | 2009-06-23 | Panasonic Corporation | Fluorescent lamp for use in a backlight unit and liquid crystal display device |
JP2009218049A (en) * | 2008-03-10 | 2009-09-24 | Nec Lighting Ltd | Fluorescent lamp |
CN103175092A (en) * | 2011-12-20 | 2013-06-26 | 上海复煊光电技术有限公司 | Straight tube type light emitting diode (LED) lamp tube |
WO2017018308A1 (en) * | 2015-07-24 | 2017-02-02 | 株式会社Asc | Fluorescent tube |
-
2001
- 2001-06-19 JP JP2001184798A patent/JP2003007252A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006179583A (en) * | 2004-12-21 | 2006-07-06 | Ushio Inc | Flash radiator |
US7550911B2 (en) | 2005-05-13 | 2009-06-23 | Panasonic Corporation | Fluorescent lamp for use in a backlight unit and liquid crystal display device |
JP2009218049A (en) * | 2008-03-10 | 2009-09-24 | Nec Lighting Ltd | Fluorescent lamp |
CN103175092A (en) * | 2011-12-20 | 2013-06-26 | 上海复煊光电技术有限公司 | Straight tube type light emitting diode (LED) lamp tube |
WO2017018308A1 (en) * | 2015-07-24 | 2017-02-02 | 株式会社Asc | Fluorescent tube |
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