JPH09102298A - Cold electrode low-pressure discharge lamp - Google Patents
Cold electrode low-pressure discharge lampInfo
- Publication number
- JPH09102298A JPH09102298A JP25864195A JP25864195A JPH09102298A JP H09102298 A JPH09102298 A JP H09102298A JP 25864195 A JP25864195 A JP 25864195A JP 25864195 A JP25864195 A JP 25864195A JP H09102298 A JPH09102298 A JP H09102298A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- discharge lamp
- refractive index
- cold cathode
- pressure discharge
- 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
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000011521 glass Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 7
- 239000013585 weight reducing agent Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 63
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical group [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- DQJSAVSZTWWXNX-UHFFFAOYSA-N [O-2].[Ce+3].[O-2].[Fe+2] Chemical compound [O-2].[Ce+3].[O-2].[Fe+2] DQJSAVSZTWWXNX-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- MIMFLBKOTSFNTP-UHFFFAOYSA-N iron(2+) oxygen(2-) tantalum(5+) Chemical compound [O-2].[Ta+5].[O-2].[Fe+2] MIMFLBKOTSFNTP-UHFFFAOYSA-N 0.000 description 1
- UCSUOYMTZRJAIH-UHFFFAOYSA-N iron(2+) oxygen(2-) titanium(4+) Chemical compound [O-2].[O-2].[Ti+4].[Fe+2] UCSUOYMTZRJAIH-UHFFFAOYSA-N 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は細管型の冷陰極低圧
放電灯に係り、さらに詳しくは発光効率を向上させると
ともに、長寿命化や小形，軽量化などを図った冷陰極低
圧放電灯に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-tube cold cathode low-pressure discharge lamp, and more particularly to a cold cathode low-pressure discharge lamp which has improved luminous efficiency and has a long life, a small size and a light weight.
【０００２】[0002]
【従来の技術】たとえば液晶表示装置は、ワードプロセ
ッサー，パーソナルコンピューター，液晶テレビなどの
表示部として広く実用化されており、用途もさらに広が
る傾向にある。つまり、液晶表示装置は、多種多様な用
途に対応できる構造，機能が要求される傾向にあり、液
晶バックライト用光源においても、小形，軽量で、より
高い発光効率などが望まれる。2. Description of the Related Art For example, a liquid crystal display device has been widely put into practical use as a display portion of a word processor, a personal computer, a liquid crystal television, etc., and its use tends to be further expanded. That is, the liquid crystal display device tends to be required to have a structure and functions capable of being used for various purposes, and a light source for a liquid crystal backlight is also required to be small in size, light in weight, and have higher luminous efficiency.
【０００３】ところで、液晶バックライト用光源として
は、一般的に、冷陰極蛍光ランプ（冷陰極低圧放電灯）
が使用されており、このような用途に対して、図２ (a)
に要部構成を断面的に、また、図２ (b)および (c)に一
部を拡大して縦・横断面的にそれぞれ示すような冷陰極
蛍光ランプが提供されている。すなわち、内壁面に紫外
線を反射する反射層１を介し、紫外線による刺激で発光
する蛍光体層２が設けられ、かつ希ガスを封有するガラ
ス管３と、このガラス管３の両端部にそれぞれ封装され
た一対の冷陰極４，４′と、この一対の冷陰極４，４′
に一端が接続し他端側がガラス管３から封止導出された
導入線５，５′とで構成されている（たとえば特開平4-
332454号公報，特開平 5-13047号公報，特開平5-41199
号公報など）。By the way, as a light source for a liquid crystal backlight, a cold cathode fluorescent lamp (cold cathode low pressure discharge lamp) is generally used.
Is used, and for such applications, Fig. 2 (a)
There is provided a cold cathode fluorescent lamp whose main structure is shown in cross section, and which is partially enlarged in FIGS. 2 (b) and 2 (c) in vertical and horizontal cross sections. That is, a glass tube 3 provided with a phosphor layer 2 that emits light upon stimulation with ultraviolet rays through a reflective layer 1 that reflects ultraviolet rays on an inner wall surface, and a rare gas is sealed, and both ends of the glass tube 3 are sealed. Pair of cold cathodes 4, 4'and the pair of cold cathodes 4, 4 '
Is connected to one end of the glass tube 3 and the other end of the glass tube 3 is sealed with lead-in wires 5 and 5 '.
332454, JP 5-13047, JP 5-41199
Issue publication).
【０００４】ここで、反射層１は、たとえば酸化チタン
もしくは酸化アルミニウムで形成されており、常套的な
蛍光ランプの製造工程に採り込みながら形成・具備させ
ている。すなわち、発光ガラス管３の素材であるガラス
管内壁面に、酸化チタン粉末もしくは酸化アルミニウム
粉末の懸濁・分散液を塗布し、乾燥，焼き付けを行っ
て、たとえば 2〜10μm 程度厚の反射膜１を形成する。
その後、前記反射膜１形成面上に所要の蛍光体粉末の懸
濁・分散液を塗布し、乾燥，焼き付けを行って、蛍光体
層２を形成した構成を採っている。Here, the reflective layer 1 is formed of, for example, titanium oxide or aluminum oxide, and is formed and provided while being incorporated in a conventional fluorescent lamp manufacturing process. That is, a suspension / dispersion liquid of titanium oxide powder or aluminum oxide powder is applied to the inner wall surface of the glass tube, which is the material of the light-emitting glass tube 3, and dried and baked to form the reflection film 1 having a thickness of, for example, 2 to 10 μm. Form.
After that, a desired suspension / dispersion liquid of phosphor powder is applied on the surface on which the reflection film 1 is formed, dried and baked to form the phosphor layer 2.
【０００５】この種の冷陰極蛍光ランプは、導入線５，
５′を介して各冷陰極４，４′に通電することによって
発生した初期プラズマ中のイオンにより、各冷陰極４，
４′から二次電子が放出され、ガラス管３内で放電が開
始する。そして、この放電開始に伴う放電エネルギーで
励起された水銀原子の共鳴遷移により紫外線が放射さ
れ、この紫外線がガラス管３内壁面の蛍光体層２によっ
て、可視光に変換されて放電灯として機能する。そし
て、この蛍光体層２による可視光変換に当たり、蛍光体
層２を透過した紫外線は反射層１によって反射され、再
び蛍光体層２に戻されて可視光に変換されるので、発光
効率が高められることになる。This type of cold cathode fluorescent lamp has a lead-in wire 5,
Ions in the initial plasma generated by energizing each cold cathode 4, 4'via 5 '
Secondary electrons are emitted from 4 ', and discharge starts in the glass tube 3. Ultraviolet rays are radiated by the resonance transition of mercury atoms excited by the discharge energy accompanying the start of discharge, and the ultraviolet rays are converted into visible light by the phosphor layer 2 on the inner wall surface of the glass tube 3 to function as a discharge lamp. . Upon conversion of visible light by the phosphor layer 2, the ultraviolet rays that have passed through the phosphor layer 2 are reflected by the reflective layer 1 and returned to the phosphor layer 2 to be converted into visible light, so that the luminous efficiency is improved. Will be done.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、液晶バ
ックライト用光源としての冷陰極蛍光ランプに関して
は、上記のように、市場の動向として、バックライトユ
ニットの薄型，軽量，高輝度，長寿命化が重要視され、
このような動向に伴い、組み込む光源（ランプ）につい
ても、より一層の軽量化，小形化，高発光効率化が望ま
れている。そして、前記のごとく、ガラスバルブ３内壁
面と蛍光体層２との間に、紫外線を反射する反射層１を
介挿させることによって、ある程度の発光効率向上が図
られるとはいえ、その発光効率に限界があって、なお実
用上十分に満足できるような、発光効率を備えた冷陰極
低圧放電灯を提供するまでに至っていない。However, regarding the cold cathode fluorescent lamp as the light source for the liquid crystal backlight, as described above, the trend of the market is that the backlight unit is thin, lightweight, high in brightness and long in life. Important
With such a trend, it is desired that the light source (lamp) to be incorporated is further reduced in weight, size, and luminous efficiency. As described above, although the reflection layer 1 that reflects ultraviolet rays is interposed between the inner wall surface of the glass bulb 3 and the phosphor layer 2, the emission efficiency can be improved to some extent, but the emission efficiency is improved. However, a cold cathode low-pressure discharge lamp having a luminous efficiency which has a limit in terms of practical use and is still satisfactory in practical use has not yet been provided.
【０００７】本発明は上記事情に対処してなされたもの
で、バックライトユニットの薄型，軽量化，高輝度化な
どが可能な、小形，軽量で発光効率の高い冷陰極低圧放
電灯の提供を目的とする。The present invention has been made in view of the above circumstances, and provides a cold cathode low-pressure discharge lamp of small size, light weight, and high luminous efficiency, which enables a backlight unit to be thin, lightweight, and have high brightness. To aim.
【０００８】[0008]
【課題を解決するための手段】請求項１の発明は、内壁
面に紫外線反射層を介して蛍光体層が設けられ、かつ希
ガスを封有するガラス管、および前記ガラス管の両端部
にそれぞれ封装された一対の冷陰極を有する冷陰極低圧
放電灯であって、前記紫外線反射層は高屈折率の物質層
および低屈折率の物質層を交互に積層化した多層型に形
成されていることを特徴とする冷陰極低圧放電灯であ
る。According to a first aspect of the present invention, there is provided a glass tube having a phosphor layer provided on an inner wall surface thereof through an ultraviolet reflection layer and containing a rare gas, and both ends of the glass tube. A cold cathode low-pressure discharge lamp having a pair of sealed cold cathodes, wherein the ultraviolet reflective layer is formed in a multi-layer type in which high refractive index material layers and low refractive index material layers are alternately laminated. It is a cold cathode low-pressure discharge lamp characterized by:
【０００９】すなわち、本発明に係る冷陰極低圧放電灯
は、発光ガラス管の内壁面に、高屈折率の物質層および
低屈折率の物質層を交互に積層・多層化し、波長λの紫
外線の反射率を高めた反射層を設け、この反射層面上に
蛍光体層を配設したことにより、水銀原子など放電媒体
の共鳴励起によって放射される紫外線の利用効率をさら
に高めることを骨子としている。That is, in the cold cathode low-pressure discharge lamp according to the present invention, a material layer having a high refractive index and a material layer having a low refractive index are alternately laminated / multilayered on the inner wall surface of the light emitting glass tube, and the The essential point is to further improve the utilization efficiency of ultraviolet rays emitted by resonance excitation of a discharge medium such as mercury atoms by providing a reflective layer having a high reflectance and disposing a phosphor layer on the surface of the reflective layer.
【００１０】本発明において、紫外線を反射する多層型
の反射層は、放電媒体の励起によって放射される波長λ
の紫外線の反射率を高めるために、積層する屈折率の高
い物質層および屈折率の低い物質層の各層ごとの厚さを
λ／4nに設定することが望ましい（ここで、 nは各物質
の屈折率である）。そして、この多層型反射層を形成す
る屈折率の高い物質および屈折率の低い物質としては、 (1)紫外線反射率を高めるために紫外域の吸収が少ない
こと、 (2)可視光の透過率が高いこと などが望ましく、たとえば高屈折率の物質として酸化チ
タン，酸化鉄，酸化コバルト，酸化タンタル，酸化セリ
ウムなどの１種もしくは２種以上の混合系が挙げられ、
また低屈折率の物質としては酸化ケイ素，酸化アルミニ
ウムなどが挙げられる。In the present invention, the multilayer reflection layer for reflecting ultraviolet rays has a wavelength λ emitted by excitation of the discharge medium.
It is desirable to set the thickness of each layer of the high-refractive index material layer and the low-refractive index material layer to be λ / 4n (where n is the Is the refractive index). And, as the high refractive index material and the low refractive index material forming this multilayer reflective layer, (1) there is little absorption in the ultraviolet region to increase the ultraviolet reflectance, (2) the visible light transmittance Is desirable, and examples of the substance having a high refractive index include titanium oxide, iron oxide, cobalt oxide, tantalum oxide, cerium oxide and the like, or a mixture of two or more of them.
Examples of the substance having a low refractive index include silicon oxide and aluminum oxide.
【００１１】上記のごとく、反射層を構成することによ
り、冷陰極低圧放電灯の発光の高効率化や長寿命化など
容易に図られるとともに、小形，計量化なども達成でき
る。すなわち、蛍光体層中の蛍光体を励起し、所要の可
視光に変換される紫外線が、反射率の高い構成とされた
多層型の反射層にされて、より効率的に可視光に変換さ
れるので、発光効率が大幅に向上することになる。ここ
で、発光効率が大幅に向上することは、同等の発光強
度，輝度を期待する場合、冷陰極低圧放電灯の小形，計
量化が図られることにもなる。つまり、多層型反射層に
よる蛍光体を励起する紫外線の効率的な利用（可視光へ
の変換）、多層型反射層のすぐれた耐用性などによっ
て、発光の高効率化や小形軽量化など図られた冷陰極低
圧放電灯が提供される。By constructing the reflective layer as described above, it is possible to easily achieve high efficiency and long life of the light emission of the cold cathode low pressure discharge lamp, and also to achieve miniaturization and weight reduction. That is, the ultraviolet rays that excite the phosphors in the phosphor layer and are converted into the required visible light are converted into visible light more efficiently by being converted into a multilayer reflective layer having a structure with high reflectance. Therefore, the luminous efficiency is significantly improved. Here, the fact that the luminous efficiency is significantly improved means that the cold cathode low-pressure discharge lamp can be miniaturized and weighed if the same luminous intensity and luminance are expected. In other words, the efficient use of ultraviolet light that excites the phosphor by the multilayer reflective layer (conversion to visible light), the excellent durability of the multilayer reflective layer, and other factors contribute to higher efficiency of light emission and reduction in size and weight. A cold cathode low pressure discharge lamp is provided.
【００１２】[0012]
【発明の実施の形態】次に図１ (a)， (b)を参照して本
発明の実施形態例を説明する。BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to FIGS. 1 (a) and 1 (b).
【００１３】図１ (a)は本発明に係る冷陰極低圧放電灯
の要部構成例を縦断面的に、また、図１ (b)は本発明に
係る冷陰極低圧放電灯の要部構成例を横断面的に示した
ものである。FIG. 1 (a) is a longitudinal cross-sectional view showing an example of essential parts of a cold cathode low pressure discharge lamp according to the present invention, and FIG. 1 (b) is an essential parts structure of a cold cathode low pressure discharge lamp according to the present invention. An example is shown in cross section.
【００１４】図１ (a)， (b)において、６は内壁面に多
層型反射層７を介して紫外線による刺激で発光する蛍光
体層８が設けられ、かつ放電媒体、たとえば希ガスや水
銀を封有する外径 3.0mm，内径 2.0mmのガラス管、９は
前記ガラス管５の両端部にそれぞれ封入された一対の冷
陰極である。ここで、多層型反射層７は、たとえば硝酸
第二鉄およびテトラブチルチタネートの混合系溶液と、
たとえばエチルシリケートのエチルアルコール系溶液と
を交互に塗布，自然乾燥し、かつ塗布，自然乾燥後、そ
の都度 600℃程度の温度で15分間程度焼成することによ
り形成された、高屈折率の物質層7a，低屈折率の物質層
7b，高屈折率の物質層7a′および低屈折率の物質層7b′
で多層的に構成されている。すなわち、放電媒体の励起
によって放射される波長λの紫外線の反射率を高めるた
めに、積層する屈折率の高い物質層7a，7a′および屈折
率の低い物質層7b，7b′の各層厚さは、それぞれλ／4n
程度に設定されている（ここで、 nは各物質の屈折率で
ある）。In FIGS. 1 (a) and 1 (b), 6 is provided with a phosphor layer 8 which emits light upon stimulation with ultraviolet rays through an inner wall surface through a multi-layered reflective layer 7, and a discharge medium such as rare gas or mercury. A glass tube having an outer diameter of 3.0 mm and an inner diameter of 2.0 mm, and 9 are a pair of cold cathodes sealed at both ends of the glass tube 5, respectively. Here, the multilayer reflective layer 7 is, for example, a mixed system solution of ferric nitrate and tetrabutyl titanate,
For example, a high-refractive-index material layer formed by alternately coating ethyl silicate with an ethyl alcohol-based solution, air-drying, and then baking and drying for 15 minutes at a temperature of approximately 600 ° C each time after coating and air-drying. 7a, low refractive index material layer
7b, high refractive index material layer 7a 'and low refractive index material layer 7b'
It is composed of multiple layers. That is, in order to increase the reflectance of the ultraviolet rays having the wavelength λ emitted by the excitation of the discharge medium, the layer thicknesses of the material layers 7a and 7a ′ having a high refractive index and the material layers 7b and 7b ′ having a low refractive index to be stacked are , Λ / 4n respectively
It is set to a degree (where n is the refractive index of each substance).
【００１５】上記冷陰極蛍光ランプは、導入線（図示省
略）を介して各冷陰極９，９′に通電すると、この通電
で発生した初期プラズマ中のイオンによって、各冷陰極
９，９′から二次電子を放出し、ガラス管６内で放電を
開始する。そして、この放電開始に伴う放電エネルギー
は、放電媒体（封入ガス）であるたとえば水銀原子の共
鳴励起によって紫外線を放射する。そして、この放射さ
れた紫外線がガラス管６内壁面の蛍光体層８によって、
可視光に変換され発光に寄与するが、可視光に変換され
ずに蛍光体層８を透過した紫外線は、反射率が高められ
た多層反射層７で効率よく反射され、再び蛍光体層８に
戻されて可視光に変換され発光に寄与する。つまり、単
層型の反射層に比べて、前記構成の多層型反射層の場合
は、より反射効率が高いため、前記可視光変換による発
光効率が高まり、小形，軽量でありながら、発光効率
（発光強度）の高い冷陰極放電灯として機能する。When the cold cathode fluorescent lamps are energized to the cold cathodes 9 and 9'through lead-in wires (not shown), the ions in the initial plasma generated by the energization cause the cold cathodes 9 and 9'to come out of the cold cathodes 9 and 9 '. Secondary electrons are emitted and discharge is started in the glass tube 6. Then, the discharge energy accompanying the start of the discharge radiates ultraviolet rays by the resonant excitation of the discharge medium (filled gas), for example, mercury atoms. Then, the emitted ultraviolet rays are caused by the phosphor layer 8 on the inner wall surface of the glass tube 6.
The ultraviolet rays which are converted into visible light and contribute to light emission, but which are not converted into visible light and have passed through the phosphor layer 8 are efficiently reflected by the multilayer reflective layer 7 having an increased reflectance, and are again reflected on the phosphor layer 8. It is returned and converted into visible light to contribute to light emission. That is, in the case of the multilayer reflective layer having the above-described configuration, the reflective efficiency is higher than that of the single-layer reflective layer, so that the luminous efficiency due to the visible light conversion is increased, and the luminous efficiency is reduced while being small and lightweight. It functions as a cold cathode discharge lamp with high emission intensity).
【００１６】上記冷陰極低圧放電灯について、常温状態
下，ランプ電流 5mAでそれぞれ点灯試験を行ったとこ
ろ、陰極降下電圧は 100 V r・ m・ s程度であり、発光
効率も従来の同等規格の冷陰極低圧放電灯に比べて 5％
程度向上していた。The cold cathode low-pressure discharge lamp was subjected to a lighting test at room temperature under a lamp current of 5 mA. The cathode drop voltage was about 100 V r · m · s, and the luminous efficiency was the same as the conventional standard. 5% compared to cold cathode low pressure discharge lamps
It had improved.
【００１７】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。多層型反射層の構成は、酸化チタン−
酸化鉄混合系層と酸化ケイ素層との交互積層に限られる
ものでなく、たとえば酸化チタン−酸化鉄混合系層の代
わりに、酸化鉄−酸化タンタル混合系，酸化鉄−酸化セ
リウム混合系などを用いることができる。また、冷陰極
の構成，蛍光体層中の蛍光体なども特に限定されるもの
ではない。The present invention is not limited to the above embodiments, but various modifications can be made without departing from the spirit of the invention. The structure of the multilayer reflective layer is titanium oxide-
It is not limited to the alternate lamination of the iron oxide mixed system layer and the silicon oxide layer, and for example, instead of the titanium oxide-iron oxide mixed system layer, an iron oxide-tantalum oxide mixed system, an iron oxide-cerium oxide mixed system, etc. Can be used. Further, the structure of the cold cathode and the phosphor in the phosphor layer are not particularly limited.
【００１８】[0018]
【発明の効果】本発明に係る冷陰極低圧放電灯によれ
ば、可視光に変換される紫外線の利用効率が向上するた
め、冷陰極低圧放電灯の発光の高効率化が容易に図られ
るし、また、コンパクト化なども達成できる。すなわ
ち、発光に寄与しないで陽光柱中が蛍光体層を透過した
紫外線が、高屈折率の物質層および低屈折率の物質層を
交互に積層して多層型化した反射層によって高い反射率
で、再び蛍光体層に戻されて蛍光体による発光に寄与す
るので、冷陰極低圧放電灯の発光効率が大幅に向上す
る。この発光効率の大幅な向上は、一方では冷陰極低圧
放電灯の消費電力の低減化や冷陰極低圧放電灯の小形，
軽量化を可能とするので、たとえば小形で高品位な液晶
表示装置の実現にも寄与する。According to the cold cathode low-pressure discharge lamp of the present invention, the utilization efficiency of ultraviolet rays converted into visible light is improved, so that the efficiency of light emission of the cold cathode low-pressure discharge lamp can be easily improved. Moreover, compactness can be achieved. In other words, the ultraviolet rays that have passed through the phosphor layer in the positive column without contributing to light emission have a high reflectance due to the reflective layer formed by alternately stacking the high refractive index substance layer and the low refractive index substance layer. The luminous efficiency of the cold cathode low-pressure discharge lamp is significantly improved because it is returned to the phosphor layer and contributes to the light emission by the phosphor. On the other hand, the significant improvement in the luminous efficiency is achieved by reducing the power consumption of the cold cathode low pressure discharge lamp and the small size of the cold cathode low pressure discharge lamp.
Since it is possible to reduce the weight, it also contributes to the realization of a small-sized and high-quality liquid crystal display device, for example.
【図１】本発明に係る冷陰極低圧放電灯の要部構成例を
示すもので、 (a)は縦断面図、(b)は横断面図。1A and 1B show an example of a main configuration of a cold cathode low-pressure discharge lamp according to the present invention, in which FIG. 1A is a vertical sectional view and FIG. 1B is a horizontal sectional view.
【図２】従来の冷陰極低圧放電灯の要部構成を示すもの
で、 (a)は縦断面図、 (b)は一部を拡大して示す縦断面
図、 (c)は拡大横断面図。FIG. 2 is a view showing a main configuration of a conventional cold cathode low-pressure discharge lamp, where (a) is a vertical sectional view, (b) is a partially enlarged vertical sectional view, and (c) is an enlarged horizontal sectional view. Fig.
１……単層の反射層 ２，８……蛍光体層 ３，６……ガラス管 ４，４′，９，９′……冷陰極 ５，５′……導入線 ７……多層型の反射層 7a，7a′……高屈折率の物質層 7b，7b′……低屈折率の物質層 1 ... Single reflective layer 2, 8 ... Phosphor layer 3, 6 ... Glass tube 4, 4 ', 9, 9' ... Cold cathode 5, 5 '... Introducing wire 7 ... Multilayer type Reflective layer 7a, 7a '... Material layer with high refractive index 7b, 7b' ... Material layer with low refractive index
Claims (1)
が設けられ、かつ希ガスを封有するガラス管、および前
記ガラス管の両端部にそれぞれ封装された一対の冷陰極
を有する冷陰極低圧放電灯であって、 前記紫外線反射層は高屈折率の物質層および低屈折率の
物質層を交互に積層化した多層型に形成されていること
を特徴とする冷陰極低圧放電灯。1. A cold cathode having a glass tube having a phosphor layer provided on an inner wall surface thereof via an ultraviolet reflecting layer and sealing a rare gas, and a pair of cold cathodes respectively sealed at both ends of the glass tube. A cold cathode low pressure discharge lamp, wherein the ultraviolet reflective layer is formed in a multi-layer type in which a material layer having a high refractive index and a material layer having a low refractive index are alternately laminated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25864195A JPH09102298A (en) | 1995-10-05 | 1995-10-05 | Cold electrode low-pressure discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25864195A JPH09102298A (en) | 1995-10-05 | 1995-10-05 | Cold electrode low-pressure discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09102298A true JPH09102298A (en) | 1997-04-15 |
Family
ID=17323097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25864195A Pending JPH09102298A (en) | 1995-10-05 | 1995-10-05 | Cold electrode low-pressure discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09102298A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002067289A1 (en) * | 2001-02-19 | 2002-08-29 | West Electric Co., Ltd. | Electric discharge tube, method of manufacturing the tube, stroboscopic device using the tube, and camera |
| KR100462297B1 (en) * | 2000-05-31 | 2004-12-17 | 레디언트 옵토-일렉트로닉스 코포레이션 | Cold Cathode Tube |
| JP2007180037A (en) * | 1999-11-10 | 2007-07-12 | Matsushita Electric Works Ltd | Light emitting element, planar light emitting board, method of manufacturing light emitting element, planar fluorescent lamp, and plasma display |
| JP2007286075A (en) * | 2001-07-17 | 2007-11-01 | Casio Comput Co Ltd | Watch |
-
1995
- 1995-10-05 JP JP25864195A patent/JPH09102298A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007180037A (en) * | 1999-11-10 | 2007-07-12 | Matsushita Electric Works Ltd | Light emitting element, planar light emitting board, method of manufacturing light emitting element, planar fluorescent lamp, and plasma display |
| KR100462297B1 (en) * | 2000-05-31 | 2004-12-17 | 레디언트 옵토-일렉트로닉스 코포레이션 | Cold Cathode Tube |
| WO2002067289A1 (en) * | 2001-02-19 | 2002-08-29 | West Electric Co., Ltd. | Electric discharge tube, method of manufacturing the tube, stroboscopic device using the tube, and camera |
| US6810208B2 (en) | 2001-02-19 | 2004-10-26 | West Electric Co., Ltd. | Electric discharge tube, method of manufacturing the tube, stroboscopic device using the tube and camera |
| JP2007286075A (en) * | 2001-07-17 | 2007-11-01 | Casio Comput Co Ltd | Watch |
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