JPH08333136A - Glass for sealing cover - Google Patents

Glass for sealing cover

Info

Publication number
JPH08333136A
JPH08333136A JP16281795A JP16281795A JPH08333136A JP H08333136 A JPH08333136 A JP H08333136A JP 16281795 A JP16281795 A JP 16281795A JP 16281795 A JP16281795 A JP 16281795A JP H08333136 A JPH08333136 A JP H08333136A
Authority
JP
Japan
Prior art keywords
glass
sealing
kovar
fluorescent lamp
liquid crystal
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.)
Granted
Application number
JP16281795A
Other languages
Japanese (ja)
Other versions
JP3575114B2 (en
Inventor
Hiroyuki Kosokabe
裕幸 香曽我部
Koichi Hashimoto
幸市 橋本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Electric Glass Co Ltd
Original Assignee
Nippon Electric Glass Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Electric Glass Co Ltd filed Critical Nippon Electric Glass Co Ltd
Priority to JP16281795A priority Critical patent/JP3575114B2/en
Publication of JPH08333136A publication Critical patent/JPH08333136A/en
Application granted granted Critical
Publication of JP3575114B2 publication Critical patent/JP3575114B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • C03C3/108—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing boron
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
    • C03C8/24—Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

PURPOSE: To obtain a glass for sealing covar, having a thermal expansion characteristic of 43-55×10<-7> / deg.C to enable the melt-sealing of covar metal, exhibiting sufficient ultraviolet solarization resistance and suitable as a glass tube for fluorescent lamp for e.g. a light source of back light. CONSTITUTION: This glass has a composition of 55.0-73.0wt.% of SiO2 , 10.0-25.0wt.% of B2 O3 , 1.0-10.0wt.% of Al2 O3 , 0-4.0wt.% of Li2 O, 0-4.3wt.% of Na2 O, 0-15.0wt.% of K2 O, 4.0-16.0wt.% of Li2 O+Na2 O+K2 O, 0.05-9.0wt.% of TiO2 and 0-10.0wt.% of PbO and a linear thermal expansion coefficient of 43 to 55×10<-7> / deg.C in the temperature range of 30 to 380 deg.C.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、コバール（＝Westingh
ouse Ele.Corp.社の商標名でＦｅ−Ｎｉ−Ｃｏ系合金。
本願においては、住友特殊金属社製ＫＶ−２、東芝社製
ＫＯＶなど、他社の同等製品も含む。）封着用ガラスに
関し、より具体的には、液晶表示素子用バックライト等
の光源となる蛍光ランプのガラス管に使用されるコバー
ル封着用ガラスに関するものである。BACKGROUND OF THE INVENTION The present invention is applicable to Kovar (= Westingh
Fe-Ni-Co alloy under the trade name of ouse Ele. Corp.
In the present application, equivalent products of other companies such as KV-2 manufactured by Sumitomo Special Metals Co., Ltd. and KOV manufactured by Toshiba Corporation are also included. The present invention relates to a sealing glass, and more specifically to a Kovar sealing glass used for a glass tube of a fluorescent lamp which serves as a light source of a backlight for a liquid crystal display device or the like.

【０００２】[0002]

【従来の技術】液晶表示素子は、光源の利用法によって
自然光や室内照明の光を利用する反射型液晶表示素子
と、液晶表示素子の背面あるいは側面に専用の照明装
置、即ちバックライトの光を用いる透過型液晶表示素子
とに大別される。腕時計や、小型の電子卓上計算機等の
特に低消費電力タイプのものには反射型液晶表示素子が
用いられるが、ＴＦＴ液晶表示素子等によるカラー表示
や、車載用計器等の高品位な表示が要求される用途に
は、蛍光ランプを光源とするバックライトを用いた透過
型液晶表示素子が主として使用されている。2. Description of the Related Art A liquid crystal display element is a reflection type liquid crystal display element which utilizes natural light or light of room illumination depending on the usage of a light source, and a dedicated illuminating device, that is, a backlight, on the back or side of the liquid crystal display element. It is roughly classified into a transmissive liquid crystal display element used. Reflective liquid crystal display elements are used for wristwatches and small electronic desk calculators, especially those with low power consumption, but color display by TFT liquid crystal display elements and high-quality display of in-vehicle instruments are required. For such applications, a transmissive liquid crystal display device using a backlight having a fluorescent lamp as a light source is mainly used.

【０００３】バックライト用蛍光ランプの発光原理は、
一般の照明用蛍光ランプと同様で、電極間の放電によっ
て封入された水銀やキセノンガスが励起し、励起したガ
スから放射される紫外線によってガラス管の内壁面に塗
られた蛍光体が可視光線を発光するというものである。
しかし、一般用の蛍光ランプとの大きな違いは、ガラス
管の径が細く、肉厚が薄く、かつ長尺なところにある。
従来、この蛍光ランプのガラス管には、加工の容易さや
照明用ガラスとしてのこれまでの実績から鉛ソーダ系の
軟質ガラスが使用され、導入金属としては安価なジュメ
ットが使われていた。The principle of light emission of a fluorescent lamp for a backlight is as follows.
Similar to general lighting fluorescent lamps, the mercury or xenon gas enclosed by the discharge between the electrodes is excited, and the phosphor coated on the inner wall surface of the glass tube emits visible light by the ultraviolet rays emitted from the excited gas. It emits light.
However, the major differences from the fluorescent lamps for general use are that the diameter of the glass tube is thin, the wall thickness is thin, and the glass tube is long.
Conventionally, lead glass soda-based soft glass has been used for the glass tube of this fluorescent lamp because of its ease of processing and past experience as lighting glass, and cheap Dumet has been used as the introduced metal.

【０００４】ところが液晶表示素子の薄型化、軽量化、
低消費電力化に伴い、バックライト用の蛍光ランプにも
より一層の細径化、薄肉化が要求されているが、蛍光ラ
ンプの細径化は構造的に機械的強度の低下やランプの発
熱の増加を伴うため、ガラス管にはより高強度、且つ低
膨張であることが必要となる。また発光効率の向上のた
めに点灯回路の高周波化が進められ、これに伴って絶縁
体であるガラス管には低誘電損失化も求められている。
このため、従来の鉛ソーダ系の軟質ガラス材質ではこれ
らの要求を満足させることができなくなってきている。However, the liquid crystal display element is made thinner and lighter,
With the reduction of power consumption, fluorescent lamps for backlights are required to have a further smaller diameter and thinner wall thickness. However, the smaller diameter of fluorescent lamps structurally reduces the mechanical strength and heat of the lamp. Therefore, the glass tube needs to have higher strength and lower expansion. Further, in order to improve the luminous efficiency, the frequency of the lighting circuit has been increased, and along with this, the glass tube as an insulator is also required to have a low dielectric loss.
For this reason, conventional lead-soda soft glass materials cannot satisfy these requirements.

【０００５】そこで、鉛ソーダ系の軟質ガラスよりも熱
的、機械的に強度が高く、低誘電損失の点でも有利なホ
ウケイ酸系の硬質ガラスを用いて蛍光ランプを作製する
ことが検討された。その結果、気密封止可能な硬質ガラ
スと金属の組合せとして、従来より知られているコバー
ル封着用ガラスとコバール金属を用いた蛍光ランプが開
発され、商品化されている。Therefore, it has been studied to manufacture a fluorescent lamp by using a borosilicate hard glass which is more thermally and mechanically stronger than a lead soda soft glass and is advantageous in terms of low dielectric loss. . As a result, as a combination of airtightly sealable hard glass and metal, a fluorescent lamp using conventionally known glass for Kovar sealing and Kovar metal has been developed and commercialized.

【０００６】[0006]

【発明が解決しようする課題】しかしながら、上記した
バックライト用蛍光ランプのガラス管は、従来からある
電子管やフォトキャップ等の電子部品の気密封止やレン
ズとして一般に使われているホウケイ酸系のコバール封
着用ガラス材質をそのまま使用し、これを単に細管状に
成形、加工したものであるため、励起された水銀やキセ
ノンガスから放出される紫外線によってガラスが変色
（いわゆる、紫外線ソラリゼーション）してしまう。ガ
ラスが変色すると、輝度の低下や発光色のずれが起こ
り、液晶表示素子に表示の暗さや演色性の劣化といった
品質の劣化を与えることになる。However, the above-mentioned glass tube of the fluorescent lamp for a backlight is a borosilicate type kovar which is generally used as a lens for hermetically sealing electronic components such as an electron tube and a photocap that have been conventionally used. Since the glass material for sealing is used as it is and is simply molded and processed into a thin tube, the glass is discolored by ultraviolet rays emitted from excited mercury or xenon gas (so-called ultraviolet solarization). When the glass is discolored, the brightness is lowered and the emission color is shifted, which causes the liquid crystal display element to be deteriorated in quality such as darkness of display and deterioration of color rendering.

【０００７】この対策として、ガラス管内面に紫外線を
反射又は吸収する成分であるＡｌ2Ｏ3 やＴｉＯ2 のコ
ーティングを行い、その上に蛍光体を塗布して多層膜を
形成し、ガラスに達する紫外線の強度を弱めるといった
方法が一部では実施されているが、この方法において
は、生産コストの上昇を伴うばかりか、より細管化が進
むにつれて均質な多層膜を形成することが困難になる。
このような事情から、蛍光ランプ用ガラス管として使用
可能な耐紫外線ソラリゼーション性を持ったコバール封
着用ガラスの開発が強く求められている。As a countermeasure against this, the inner surface of the glass tube is coated with Al 2 O 3 or TiO 2 , which is a component that reflects or absorbs ultraviolet rays, and a phosphor is applied on top of this to form a multilayer film, which reaches the glass. Although a method of weakening the intensity of ultraviolet rays is partially implemented, this method not only increases the production cost, but also makes it difficult to form a homogeneous multilayer film as the tube becomes thinner.
Under these circumstances, there is a strong demand for the development of a glass for Kovar sealing that has ultraviolet resistance and can be used as a glass tube for fluorescent lamps.

【０００８】本発明は、上記事情に鑑みなされたもので
あり、コバール金属と封着可能な４３〜５５×１０-7／
℃の熱膨張特性を持ち、しかも十分な耐紫外線ソラリゼ
ーション性を有するため、バックライトの光源等に用い
られる蛍光ランプ用ガラス管として好適なコバール封着
用ガラスを提供することを目的とするものである。The present invention has been made in view of the above circumstances, and 43 to 55 × 10 −7 / which can be sealed with Kovar metal.
An object of the present invention is to provide a glass for Kovar sealing, which has a thermal expansion property of ℃ and has sufficient resistance to UV solarization, and which is suitable as a glass tube for a fluorescent lamp used as a light source of a backlight or the like. .

【０００９】[0009]

【課題を解決するための手段】即ち、本発明のコバール
封着用ガラスは、重量百分率で、ＳｉＯ2 ５５．０〜
７３．０％、Ｂ2 Ｏ3 １０．０〜２５．０％、Ａｌ2
Ｏ3 １．０〜１０．０％、Ｌｉ2 Ｏ ０〜４．０％、
Ｎａ2 Ｏ ０〜４．３％、Ｋ2 Ｏ ０〜１５．０％、Ｌ
ｉ2 Ｏ＋Ｎａ2 Ｏ＋Ｋ2 Ｏ ４．０〜１６．０％、Ｔｉ
Ｏ2 ０．０５〜９．０％、ＰｂＯ ０〜１０．０％の
組成を有し、３０〜３８０℃の温度範囲における線膨張
係数が４３〜５５×１０-7／℃であることを特徴とす
る。That is, the glass for Kovar sealing of the present invention has a weight percentage of SiO 2 55.0 to.
73.0%, B 2 O 3 10.0~25.0 %, Al 2
O 3 1.0~10.0%, Li 2 O 0~4.0%,
Na 2 O 0-4.3%, K 2 O 0-15.0%, L
i 2 O + Na 2 O + K 2 O 4.0 to 16.0%, Ti
It has a composition of O 2 0.05 to 9.0% and PbO 0 to 10.0%, and a linear expansion coefficient in the temperature range of 30 to 380 ° C. is 43 to 55 × 10 −7 / ° C. And

【００１０】また本発明のコバール封着用ガラスは、蛍
光ランプ用ガラス管として使用されることを特徴とす
る。The glass for Kovar sealing of the present invention is characterized by being used as a glass tube for a fluorescent lamp.

【００１１】[0011]

【作用】本発明のコバール封着用ガラスを構成する各成
分の含有量を上記のように限定した理由は以下の通りで
ある。The reason for limiting the content of each component constituting the glass for Kovar sealing of the present invention as described above is as follows.

【００１２】ＳｉＯ2 は、ガラスの骨格を構成するため
に必要な主成分であり、その含有量は５５．０〜７３．
０％、好ましくは６３．０〜７２．０％である。ＳｉＯ
2 が７３．０％より多いと、線膨張係数が低くなりすぎ
ると共に溶解性が悪化し、５５．０％より少ないと耐候
性が悪化し、これによってガラス表面にヤケ等が生じた
場合には蛍光ランプの輝度低下の原因になる。[0012] SiO 2 is a main component necessary for forming the skeleton of glass, and the content thereof is 55.0 to 73.
It is 0%, preferably 63.0 to 72.0%. SiO
When 2 is more than 73.0%, the linear expansion coefficient becomes too low and the solubility is deteriorated. When it is less than 55.0%, the weather resistance is deteriorated, and when the glass surface is burned or the like, This may cause a decrease in the brightness of the fluorescent lamp.

【００１３】Ｂ2 Ｏ3 は溶解性の向上や粘度の調整のた
めに必要な成分であり、その含有量は１０．０〜２５．
０％、好ましくは１５．０〜２２．０％である。Ｂ2 Ｏ
3 が１０．０％より少ないと溶解が困難になり、且つ、
コバール封着用としては粘度が高くなりすぎる。また、
２５．０％より多いと逆に粘度が下がり過ぎたり、蒸発
によって均質なガラスが得られなくなったり、耐候性が
悪化するといった問題が発生する。B 2 O 3 is a component necessary for improving the solubility and adjusting the viscosity, and the content thereof is 10.0 to 25.
It is 0%, preferably 15.0 to 22.0%. B 2 O
When 3 is less than 10.0%, it becomes difficult to dissolve, and
Viscosity becomes too high for sealing Kovar. Also,
On the other hand, if it is more than 25.0%, there arise problems that the viscosity is excessively lowered, that homogeneous glass cannot be obtained due to evaporation, and the weather resistance is deteriorated.

【００１４】Ａｌ2 Ｏ3 は、ガラスの安定性を向上する
のに著しい効果があり、その含有量は１．０〜１０．０
％、好ましくは２．５〜４．４％である。Ａｌ2 Ｏ3 が
１０．０％を多いとガラスの溶解が困難になり、１．０
％より少ないと、ガラスが失透し易くなり、均質なガラ
スの製造や安定した成形が困難になる。Al 2 O 3 has a remarkable effect of improving the stability of glass, and its content is 1.0 to 10.0.
%, Preferably 2.5 to 4.4%. If Al 2 O 3 is more than 10.0%, it becomes difficult to melt the glass, and 1.0
If it is less than 0.1%, the glass tends to devitrify, and it becomes difficult to produce a homogeneous glass and stably form it.

【００１５】アルカリ金属酸化物であるＬｉ2 Ｏ、Ｎａ
2 Ｏ、及びＫ2 Ｏはガラスの溶解を容易にし、膨張係数
や粘度を調節するために添加する成分であり、その含有
量はＬｉ2 Ｏが０〜４．０％、好ましくは０〜２．０
％、Ｎａ2 Ｏが０〜４．３％、好ましくは０〜３．０
％、Ｋ2 Ｏが０〜１５．０％、好ましくは０〜１１．０
％である。Ｌｉ2 Ｏが４．０％より多いと、失透性が悪
化するため好ましくない。Ｎａ2 Ｏが４．３％より多い
と蛍光ランプ製造時の熱工程においてＮａイオンが蛍光
体を汚染し、輝度の低下を引き起こしてしまう。Ｋ2 Ｏ
が１５．０％を越えると熱膨張係数が高くなり過ぎる。Li 2 O and Na which are alkali metal oxides
2 O and K 2 O are components added to facilitate the melting of glass and adjust the expansion coefficient and viscosity. The content of Li 2 O is 0 to 4.0%, preferably 0 to 2 .0
%, Na 2 O is 0 to 4.3%, preferably 0 to 3.0
%, K 2 O is 0 to 15.0%, preferably 0 to 11.0
%. When the content of Li 2 O is more than 4.0%, devitrification deteriorates, which is not preferable. If the content of Na 2 O is more than 4.3%, Na ions will contaminate the phosphor in the heat step during the production of the fluorescent lamp, resulting in a decrease in brightness. K 2 O
If it exceeds 15.0%, the coefficient of thermal expansion becomes too high.

【００１６】なお、Ｌｉ2 Ｏ、Ｎａ2 Ｏ及びＫ2 Ｏの合
量は４．０〜１６．０％、好ましくは６．１〜１４．０
％である。これら成分の合量が４．０％以下では膨張係
数が小さすぎ、また１６．０％以上では逆に膨張係数が
高くなりすぎるためコバール封着には適さなく、且つ耐
候性の大幅な低下を招く。The total amount of Li 2 O, Na 2 O and K 2 O is 4.0 to 16.0%, preferably 6.1 to 14.0.
%. If the total amount of these components is 4.0% or less, the expansion coefficient is too small, and if it is 16.0% or more, the expansion coefficient is too high, which is not suitable for Kovar sealing, and the weather resistance is greatly reduced. Invite.

【００１７】ＴｉＯ2 はガラスに高い耐紫外線ソラリゼ
ーション性を付与する成分であり、その含有量は０．０
５〜９．０％、好ましくは０．０５〜５．０％である。
ＴｉＯ2 が０．０５％より少ないとその効果がなく、
９．０％を越えるとガラス自身が着色するようになり、
また失透性も急激に悪化するため透明で均質なガラスが
得られなくなる。TiO 2 is a component which imparts a high resistance to UV solarization to glass, and its content is 0.0
It is 5 to 9.0%, preferably 0.05 to 5.0%.
If TiO 2 is less than 0.05%, the effect will not be obtained,
If it exceeds 9.0%, the glass itself becomes colored,
Further, the devitrification property also deteriorates sharply, so that a transparent and homogeneous glass cannot be obtained.

【００１８】ＰｂＯもＴｉＯ2 と同様にガラスに高い耐
紫外線ソラリゼーション性を付与する成分であり、その
含有量は０〜１０．０％、好ましくは０〜７．０％であ
る。ＰｂＯが１０．０％を超えると、溶融時に蒸発して
均質なガラスが得られなくなるとともに、環境上好まし
くない。Like TiO 2 , PbO is also a component which imparts high resistance to UV solarization to glass, and its content is 0 to 10.0%, preferably 0 to 7.0%. If the PbO content exceeds 10.0%, it will evaporate during melting and a homogeneous glass will not be obtained, which is environmentally unfavorable.

【００１９】さらに本発明のガラスは、ガラスの粘度の
調整や耐候性、溶解性、清澄性を改善する目的で、Ｚｒ
Ｏ2 、ＳｒＯ、ＢａＯ、ＣａＯ、ＭｇＯ、ＺｎＯ、Ｐ2
Ｏ5、Ａｓ2 Ｏ3 、Ｓｂ2 Ｏ3 、ＳＯ3 、Ｆ2 、Ｃｌ2
等の各成分を適量添加することが可能である。Further, the glass of the present invention is Zr for the purpose of adjusting the viscosity of the glass and improving the weather resistance, the solubility and the clarity.
O 2 , SrO, BaO, CaO, MgO, ZnO, P 2
O 5 , As 2 O 3 , Sb 2 O 3 , SO 3 , F 2 , Cl 2
It is possible to add an appropriate amount of each component such as.

【００２０】また本発明において、３０〜３８０℃の温
度範囲における線膨張係数を４３〜５５×１０-7／℃に
限定した理由は、線膨張係数がこの範囲から外れるとコ
バール金属の膨張係数との不整合により、スローリーク
やクラックが発生し、蛍光ランプとしての機能が損なわ
れるためである。Further, in the present invention, the reason why the linear expansion coefficient in the temperature range of 30 to 380 ° C. is limited to 43 to 55 × 10 -7 / ° C. is that the coefficient of linear expansion deviates from this range and the expansion coefficient of Kovar metal. This is because the misalignment of (3) causes slow leaks and cracks and impairs the function of the fluorescent lamp.

【００２１】[0021]

【実施例】次に本発明のコバール封着用ガラスを実施例
に基づいて説明する。EXAMPLES Next, the glass for Kovar sealing of the present invention will be described based on Examples.

【００２２】表１及び表２は本発明のコバール封着用ガ
ラスの実施例（試料Ｎｏ．１〜９）、表３は比較例（試
料Ｎｏ．１０及び１１）をそれぞれ示している。Tables 1 and 2 show examples of the Kovar sealing glass of the present invention (samples Nos. 1 to 9), and Table 3 shows comparative examples (samples Nos. 10 and 11).

【００２３】[0023]

【表１】 [Table 1]

【００２４】[0024]

【表２】 [Table 2]

【００２５】[0025]

【表３】 [Table 3]

【００２６】表に示したＮｏ．１〜１１の各試料は、次
のようにして調製した。No. shown in the table. Each sample of 1 to 11 was prepared as follows.

【００２７】まず表に示す組成となるようにガラス原料
を調合した後、白金坩堝を用いて１５５０℃で５時間溶
解した。溶解後、融液をカ−ボン板上に流しだし、アニ
−ルすることによって各ガラス試料を作製し、それらの
３０〜３８０℃の温度範囲における線膨張係数、及び紫
外線照射前後の分光透過率を測定し、各特性を表に示し
た。First, glass raw materials were prepared so as to have the compositions shown in the table and then melted at 1550 ° C. for 5 hours using a platinum crucible. After melting, the melt was poured onto a carbon plate and annealed to prepare each glass sample, and the linear expansion coefficient in the temperature range of 30 to 380 ° C. and the spectral transmittance before and after the irradiation of ultraviolet rays. Was measured, and each property is shown in the table.

【００２８】表から明らかなように、本発明の実施例で
あるＮｏ．１〜９の各試料は、線膨張係数が４５．４〜
５４．４×１０-7／℃であり、コバール金属のそれと近
似しており、また紫外線照射による透過率の低下が１．
０％以下と殆どないため、高い耐紫外線ソラリゼーショ
ン性を有していることが理解できる。As is apparent from the table, No. 1 which is an embodiment of the present invention. Each of the samples 1 to 9 has a linear expansion coefficient of 45.4 to
54.4 × 10 −7 / ° C., which is similar to that of Kovar metal, and the decrease in transmittance due to ultraviolet irradiation is 1.
Since it is almost 0% or less, it can be understood that it has a high resistance to UV solarization.

【００２９】それに対し比較例であるＮｏ．１０及び１
１の試料は、線膨張係数はコバール金属と封着可能であ
る４３〜５５×１０-7／℃の範囲内にはあるが、ＴｉＯ
2 とＰｂＯを何れも全く含有していないため紫外線照射
による透過率の低下が７％以上と大きく、耐紫外線ソラ
リゼーション性が非常に低かった。On the other hand, No. 10 and 1
The sample of No. 1 has a coefficient of linear expansion within the range of 43 to 55 × 10 −7 / ° C., which is capable of sealing with Kovar metal,
Since neither 2 nor PbO was contained at all, the decrease in transmittance due to ultraviolet irradiation was as large as 7% or more, and the resistance to ultraviolet solarization was very low.

【００３０】なお表中の線膨張係数は、ガラスを直径約
３ｍｍ長さ約５０ｍｍの円柱に加工した後に、自記示差
熱膨張計で、３０〜３８０℃の温度範囲における平均線
膨張係数を測定したものである。The linear expansion coefficient in the table was obtained by processing glass into a cylinder having a diameter of about 3 mm and a length of about 50 mm, and measuring the average coefficient of linear expansion in the temperature range of 30 to 380 ° C. with a self-recording differential thermal dilatometer. It is a thing.

【００３１】耐紫外線ソラリゼーション性は、ガラスを
厚さ１ｍｍの板状に両面を鏡面研磨し、まず紫外線照射
前の試料の透過率８０％を示す光の波長を測定し、次い
で、その試料に４０Ｗの低圧水銀ランプによって主波長
２５３．７ｎｍの紫外線を６０分間照射した後、照射前
に透過率８０％を示した波長における透過率を改めて測
定することによって、紫外線照射による透過率の低下を
求めた。この時、耐紫外線ソラリゼーション性の劣るガ
ラスほどこの透過率低下が大きくなるが、液晶バックラ
イト等の蛍光ランプ用ガラス管としては、この低下が殆
どないことが重要である。The UV solarization resistance is obtained by mirror-polishing both sides of glass into a plate having a thickness of 1 mm, first measuring the wavelength of light showing a transmittance of 80% of the sample before UV irradiation, and then measuring 40 W for the sample. After irradiating ultraviolet rays having a main wavelength of 253.7 nm for 60 minutes with the low-pressure mercury lamp, the transmittance at a wavelength showing a transmittance of 80% was measured again before the irradiation to determine the decrease in the transmittance due to the ultraviolet irradiation. . At this time, the lower the transmittance of the glass is, the greater the deterioration of the UV solarization resistance is. However, it is important for a glass tube for a fluorescent lamp such as a liquid crystal backlight to have almost no such decrease.

【００３２】[0032]

【発明の効果】以上のように本発明のコバール封着用ガ
ラスは、コバール金属との封着に適した４３〜５５×１
０-7／℃の線熱膨張係数を有し、しかも優れた耐紫外線
ソラリゼーション性を有するため、蛍光ランプ用ガラス
管、特に液晶表示素子用バックライトの光源となる蛍光
ランプのガラス管用材質として好適である。As described above, the glass for Kovar sealing of the present invention is suitable for sealing with Kovar metal in the range of 43 to 55 × 1.
Since it has a coefficient of linear thermal expansion of 0 -7 / ° C and excellent ultraviolet solarization resistance, it is suitable as a material for glass tubes for fluorescent lamps, especially glass tubes for fluorescent lamps used as the light source of the backlight for liquid crystal display devices. Is.

【００３３】また本発明のコバール封着用ガラスを用い
て作製した液晶バックライトの蛍光ランプ用ガラス管
は、耐紫外線ソラリゼーション性が高いため、ガラスの
変色に起因する液晶表示素子の品質の劣化を防止するこ
とができる。Further, since the glass tube for a fluorescent lamp of a liquid crystal backlight manufactured by using the glass for sealing Kovar of the present invention has high resistance to ultraviolet solarization, deterioration of the quality of the liquid crystal display element due to discoloration of the glass is prevented. can do.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 重量百分率で、ＳｉＯ2 ５５．０〜７
３．０％、Ｂ2 Ｏ3 １０．０〜２５．０％、Ａｌ2 Ｏ3
１．０〜１０．０％、Ｌｉ2 Ｏ ０〜４．０％、Ｎ
ａ2 Ｏ ０〜４．３％、Ｋ2 Ｏ ０〜１５．０％、Ｌｉ
2 Ｏ＋Ｎａ2 Ｏ＋Ｋ2 Ｏ ４．０〜１６．０％、ＴｉＯ
2 ０．０５〜９．０％、ＰｂＯ ０〜１０．０％の組
成を有し、３０〜３８０℃の温度範囲における線膨張係
数が４３〜５５×１０-7／℃であることを特徴とするコ
バール封着用ガラス。1. A weight percentage of SiO 2 55.0-7.
3.0%, B 2 O 3 10.0~25.0 %, Al 2 O 3
1.0 to 10.0%, Li 2 O 0 to 4.0%, N
a 2 O 0 to 4.3%, K 2 O 0 to 15.0%, Li
2 O + Na 2 O + K 2 O 4.0 to 16.0%, TiO
2 has a composition of 0.05 to 9.0% and PbO of 0 to 10.0%, and has a linear expansion coefficient of 43 to 55 × 10 −7 / ° C. in a temperature range of 30 to 380 ° C. Glass for Kovar sealing. 【請求項２】 蛍光ランプ用ガラス管として使用される
ことを特徴とする請求項１のコバール封着用ガラス。2. The glass for sealing Kovar according to claim 1, which is used as a glass tube for a fluorescent lamp.
JP16281795A 1995-06-05 1995-06-05 Kovar sealing glass Expired - Lifetime JP3575114B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16281795A JP3575114B2 (en) 1995-06-05 1995-06-05 Kovar sealing glass

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16281795A JP3575114B2 (en) 1995-06-05 1995-06-05 Kovar sealing glass

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2003360176A Division JP2004099439A (en) 2003-10-21 2003-10-21 Method for using kovar sealing glass

Publications (2)

Publication Number Publication Date
JPH08333136A true JPH08333136A (en) 1996-12-17
JP3575114B2 JP3575114B2 (en) 2004-10-13

Family

ID=15761800

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16281795A Expired - Lifetime JP3575114B2 (en) 1995-06-05 1995-06-05 Kovar sealing glass

Country Status (1)

Country Link
JP (1) JP3575114B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002008134A1 (en) * 2000-07-22 2002-01-31 Schott Glas Borosilicate glass with high chemical resistance and use thereof
CN100413011C (en) * 2004-08-06 2008-08-20 于首成 Health-care UV-lamp
JP4743650B2 (en) * 2000-12-15 2011-08-10 日本電気硝子株式会社 Kovar seal glass for fluorescent lamps
CN112723739A (en) * 2020-12-18 2021-04-30 新沂海福尔通用仪表有限公司 Quartz pull tube and production process thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007069527A1 (en) 2005-12-16 2007-06-21 Nippon Electric Glass Co., Ltd. Lighting glass
JP2009263168A (en) 2008-04-25 2009-11-12 Hitachi Displays Ltd Glass for fluorescent lamp, glass tube using the same, fluorescent lamp using the same and liquid crystal display using the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002008134A1 (en) * 2000-07-22 2002-01-31 Schott Glas Borosilicate glass with high chemical resistance and use thereof
US6794323B2 (en) 2000-07-22 2004-09-21 Schott Glas Borosilicate glass with high chemical resistance and use thereof
JP4743650B2 (en) * 2000-12-15 2011-08-10 日本電気硝子株式会社 Kovar seal glass for fluorescent lamps
CN100413011C (en) * 2004-08-06 2008-08-20 于首成 Health-care UV-lamp
CN112723739A (en) * 2020-12-18 2021-04-30 新沂海福尔通用仪表有限公司 Quartz pull tube and production process thereof

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