JPH1083761A - Manufacture of discharge tube for high pressure discharge lamp - Google Patents
Manufacture of discharge tube for high pressure discharge lampInfo
- Publication number
- JPH1083761A JPH1083761A JP23633296A JP23633296A JPH1083761A JP H1083761 A JPH1083761 A JP H1083761A JP 23633296 A JP23633296 A JP 23633296A JP 23633296 A JP23633296 A JP 23633296A JP H1083761 A JPH1083761 A JP H1083761A
- Authority
- JP
- Japan
- Prior art keywords
- discharge tube
- discharge lamp
- quartz glass
- lamp
- devitrification
- 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
Landscapes
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、一般照明用、投射
型ディスプレー用などに利用される高圧放電ランプ用の
放電管体の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a discharge tube for a high-pressure discharge lamp used for general lighting, projection type displays, and the like.
【０００２】[0002]
【従来の技術】従来、金属ハロゲン化物放電ランプの場
合、放電管体として石英ガラス（組成は１００％に近い
ＳｉＯ2）が用いられる場合が多い。しかし、この材料
の欠点として、ランプ点灯の積算時間が増えた場合、石
英ガラスがランプ封入物の高圧蒸気と反応する結果、光
学的透過率が低減する現象が不可避的であることが挙げ
られる。以下、この現象を失透現象（または単に失透）
と呼ぶ。2. Description of the Related Art Conventionally, in the case of a metal halide discharge lamp, quartz glass (the composition is nearly 100% SiO 2 ) is often used as a discharge tube. However, a disadvantage of this material is that if the integrated time of lamp operation is increased, the phenomenon that the quartz glass reacts with the high-pressure steam of the lamp enclosure and the optical transmittance is reduced is inevitable. Hereinafter, this phenomenon is referred to as devitrification (or simply devitrification).
Call.
【０００３】石英ガラス放電管体の成型は、従来、中空
放電管体を加熱軟化させ、次にＡｒや窒素等の気体を中
空放電管体内部に導入して加熱軟化した領域を金型に押
し付けて行われている（例えば、特開平３−１４７２３
０号公報）。Ａｒや窒素が用いられてきたのは、安定で
扱い易いガスであり、かつ低価格という理由からであ
る。本発明で示す様に、成型時のブローガスの種類が石
英ガラス管体の失透に影響を有する事は明らかではなか
った。Conventionally, a quartz glass discharge tube is formed by heating and softening a hollow discharge tube, and then introducing a gas such as Ar or nitrogen into the inside of the hollow discharge tube to press the heated and softened region against a mold. (For example, see Japanese Patent Application Laid-Open No. 3-14723).
No. 0). Ar and nitrogen have been used because they are stable and easy-to-handle gases and are inexpensive. As shown in the present invention, it was not clear that the type of blow gas during molding had an effect on the devitrification of the quartz glass tube.
【０００４】[0004]
【発明が解決しようとする課題】前記した透過率の低下
を抑制するため、例えば、特開平４−３７０６４４号公
報には、発光管体の内壁に酸化アルミ膜などの保護膜を
設けることも記載されている。しかしながら、石英ガラ
スの線膨張係数は特徴的に小さく（０．５４ｐｐｍ／
℃）、その上に直接、線膨張係数の大きい酸化アルミ
（７〜８ｐｐｍ／℃）などを耐食膜として形成しても、
ランプ動作時の高熱（最高約１０００℃）と消灯時の室
温を繰り返す場合の動的な機械的応力により、内面膜
は、ひび割れ、または剥離してしまい、実用的に耐久性
のある構造の実現には至っていないのが現状である。In order to suppress the decrease in transmittance, for example, Japanese Patent Application Laid-Open No. 4-370644 discloses that a protective film such as an aluminum oxide film is provided on the inner wall of an arc tube. Have been. However, the linear expansion coefficient of quartz glass is characteristically small (0.54 ppm /
C), and even if aluminum oxide (7 to 8 ppm / ° C) having a large linear expansion coefficient is directly formed thereon as a corrosion-resistant film,
The internal film is cracked or peeled off due to the dynamic mechanical stress when the lamp is repeatedly operated between high heat (up to about 1000 ° C) and room temperature when the lamp is turned off, realizing a practically durable structure. Is not yet reached.
【０００５】さらに、米国特許第５,２７０,６１５号明
細書に、前記課題を回避するため、１〜４ｐｐｍ／℃の
比較的低い膨張係数を有する酸化膜の上に耐食性の高い
酸化膜を積層した多層構造の構成が示されている。しか
しながら、膨張係数の整合という手段のみでは必ずしも
失透防止効果が現出するものではない。Further, in order to avoid the above problem, US Pat. No. 5,270,615 discloses that an oxide film having high corrosion resistance is laminated on an oxide film having a relatively low expansion coefficient of 1 to 4 ppm / ° C. The structure of the multi-layer structure is shown. However, the devitrification prevention effect does not always appear only by means of matching the expansion coefficients.
【０００６】本発明は上記課題を解決するもので、失透
の少ない長寿命の高圧放電ランプを実現することであ
る。An object of the present invention is to solve the above-mentioned problems and to realize a long-life high-pressure discharge lamp with little devitrification.
【０００７】[0007]
【課題を解決するための手段】上記目的を達するため、
本発明の高圧放電ランプ用の放電管体の製造方法は、中
空放電管体を加熱軟化させる工程と、気体を中空放電管
体内部に導入して加熱軟化した領域を金型に押し付けて
成型する工程を有し、前記中空放電管体内部に導入する
気体としてＨｅもしくは、少なくとも５体積％以上のＨ
ｅを含有した気体を用いる方法である。In order to achieve the above object,
The method for manufacturing a discharge tube for a high-pressure discharge lamp according to the present invention includes the steps of heating and softening the hollow discharge tube, and introducing a gas into the inside of the hollow discharge tube to press and mold the heated and softened region against a mold. A gas to be introduced into the hollow discharge tube body by using He or at least 5% by volume or more of H
This is a method using a gas containing e.
【０００８】本発明の製造方法の優れた点は、中空放電
管体内部の内面に失透防止用の薄膜を設ける手段に比較
して工程の複雑化や工程数の増加がなく、高い生産性が
容易に実現できることである。An advantage of the manufacturing method of the present invention is that the production process is not complicated and the number of processes is not increased as compared with a method in which a thin film for preventing devitrification is provided on the inner surface inside the hollow discharge tube, and high productivity is obtained. Can be easily realized.
【０００９】[0009]
【発明の実施の形態】以下本発明の実施の形態につい
て、図面を参照しながら説明する。図１は本発明の一実
施の形態の高圧放電ランプ用の放電管体の製造方法を示
す工程図、図２は同放電管体を用いて作製したメタルハ
ライドランプを示す模式図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a process diagram showing a method for manufacturing a discharge tube for a high-pressure discharge lamp according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a metal halide lamp manufactured using the discharge tube.
【００１０】図中、１は石英ガラス管体、２はガスバー
ナー、３は成型用金型、４は成型用のブローガスで、Ｈ
ｅもしくは、少なくとも５体積％以上のＨｅを含有した
期待である。５はタングステン電極、６はモリブデン
箔、７は外部引出し電極、８は発光管体である。In the figure, 1 is a quartz glass tube, 2 is a gas burner, 3 is a molding die, 4 is a blow gas for molding,
This is expected to contain e or at least 5% by volume of He. Reference numeral 5 denotes a tungsten electrode, 6 denotes a molybdenum foil, 7 denotes an external lead electrode, and 8 denotes an arc tube.
【００１１】まず、図１（ａ）に示す第１工程では、石
英ガラス管体１を回転させながら、ガスバーナー２の火
炎熱により部分的に加熱し軟化させる。First, in a first step shown in FIG. 1A, the quartz glass tube 1 is partially heated and softened by the flame heat of the gas burner 2 while rotating.
【００１２】次に図１（ｂ）に示す様に、第２工程で
は、金型３を軟化部に近接させ、同時にガラス管体内部
にブローガス４を導入しブロー成型する。Next, as shown in FIG. 1B, in a second step, the mold 3 is brought close to the softened portion, and at the same time, a blow gas 4 is introduced into the inside of the glass tube to carry out blow molding.
【００１３】次に、本発明の高圧放電ランプ用の放電管
体の製造方法の具体例を説明する。何れの実施例でも、
中空放電管体のガラス管体を加熱軟化させる工程と、気
体を前記ガラス管体内部に導入して加熱軟化した領域を
金型に押し付けて球状または疑似球状に成型する工程を
有する点は共通するが、導入する気体が異なるものであ
る。Next, a specific example of the method for manufacturing a discharge tube for a high-pressure discharge lamp according to the present invention will be described. In either embodiment,
The point of having a step of heating and softening the glass tube of the hollow discharge tube and a step of introducing a gas into the inside of the glass tube and pressing the heated and softened region against a mold to mold into a spherical or pseudo spherical shape are common. However, the gas introduced is different.
【００１４】（実施例１）図１（ｂ）に示す第２工程で
のブローガス４として、純Ｈｅを用いた。Example 1 Pure He was used as the blow gas 4 in the second step shown in FIG.
【００１５】（実施例２）図１（ｂ）に示す第２工程で
のブローガス４として、Ｈｅ２０％＋Ａｒ８０％組成の
混合ガスを用いた。Example 2 As the blow gas 4 in the second step shown in FIG. 1B, a mixed gas having a composition of 20% He + 80% Ar was used.
【００１６】上記した２例以外に、参照用として、従来
より使用している純Ａｒガスによる成型も実施した。製
造工程の違いによる高圧放電ランプの失透の差を確認す
るため、図２に模式図を示すメタルハライドランプを作
製し、光学系を介してスクリーンに投影したときのスク
リーン照度の経時変化を実測した。In addition to the above-mentioned two examples, molding with a conventionally used pure Ar gas was also performed for reference. In order to confirm the difference in devitrification of the high-pressure discharge lamp due to the difference in the manufacturing process, a metal halide lamp whose schematic diagram is shown in FIG. .
【００１７】図２にて、ランプの封入物はヨウ化インジ
ウム０．４ｍｇ、ヨウ化ツリウム２ｍｇ、水銀３５ｍｇ
およびＡｒガス１００Ｔｏｒｒとした。ブロー成型時の
ブローガスを変えた以外の製造工程はすべて同一条件で
固定してランプを作製した。In FIG. 2, the lamp is filled with indium iodide 0.4 mg, thulium iodide 2 mg, mercury 35 mg.
And Ar gas was 100 Torr. Lamps were manufactured by fixing under the same conditions in all the manufacturing steps except for changing the blow gas at the time of blow molding.
【００１８】便宜上、ランプの寿命を前記したスクリー
ン照度が初期値の５０％になる経過時間とすると、実施
例１の純Ｈｅで３８００時間、実施例２のＨｅ２０％＋
Ａｒ８０％混合ガスで３２００時間および参照用の純Ａ
ｒの場合で、２７００時間であった。この値は各条件に
つき４本作製したランプの平均値である。For convenience, assuming that the life of the lamp is the elapsed time when the above-mentioned screen illuminance is 50% of the initial value, 3800 hours of pure He of Example 1 and 20% of He of Example 2+
3200 hours with 80% Ar gas mixture and pure A for reference
In the case of r, it was 2700 hours. This value is an average value of four lamps manufactured for each condition.
【００１９】以上に示した様に本実施の形態のランプ
は、従来例の製造方法の放電ランプに比較して、スクリ
ーン照度が初期値の１／２になる時間を寿命としたと
き、約１８〜４０％の長寿命化が認められた。As described above, the lamp according to the present embodiment has a life of about 18 times that when the screen illuminance is １ ／ of the initial value, as compared with the discharge lamp according to the conventional manufacturing method. A service life extension of ４０40% was observed.
【００２０】ブローガスは上記以外にも、Ｈｅの含有率
を選ぶことが可能である。但し、少なくとも５％は含有
させないと効果は少ないことが、実験により判明してい
る。好ましくは、Ｈｅの含有率を２０％以上にすること
である。ＨｅはＡｒに比較して高価であるから、Ｈｅの
含有量を低下させることは、製造コスト低減につなが
る。The content of He can be selected for the blow gas in addition to the above. However, experiments have shown that the effect is small unless at least 5% is contained. Preferably, the content of He is set to 20% or more. Since He is more expensive than Ar, reducing the content of He leads to a reduction in manufacturing cost.
【００２１】なお、上記実施例では、放電管体として石
英ガラスを用いたが、同様の製造工程を用いる他の種類
の材料の場合でも本発明は有効である。In the above embodiment, quartz glass is used as the discharge tube. However, the present invention is effective for other kinds of materials using the same manufacturing process.
【００２２】[0022]
【発明の効果】以上のように本発明では、純Ｈｅもしく
は、少なくとも５体積％以上のＨｅを含有した気体を用
いて、石英ガラスなどの放電ランプ用管体を加熱軟化さ
せて成型することを特徴としており、原子半径の小さい
Ｈｅが軟化した放電管体の編目状間隙に押し込まれ、失
透を加速する水分やＯＨ基などの各種不純物を追い出す
ため、放電管体のランプ点灯中の失透現象を抑制でき、
長寿命の高圧放電灯を実現できるという効果を有する。As described above, according to the present invention, a discharge lamp tube made of quartz glass or the like is heated and softened using pure He or a gas containing at least 5% by volume of He. As a feature, He with a small atomic radius is pushed into the stitch-shaped gap of the softened discharge tube and drives out various impurities such as moisture and OH groups that accelerate devitrification. Phenomenon can be suppressed,
This has the effect that a long-life high-pressure discharge lamp can be realized.
【図１】（ａ）本発明の一実施の形態による高圧放電ラ
ンプ用の放電管体の製造方法の第１工程を模式的に示す
工程図 （ｂ）同製造方法の第２工程を模式的に示す工程図FIG. 1A is a process diagram schematically showing a first step of a method of manufacturing a discharge tube for a high-pressure discharge lamp according to an embodiment of the present invention. FIG. 1B is a schematic view of a second step of the method. Process diagram shown
【図２】本発明の一実施の形態による高圧放電ランプ用
の放電管体を用いて作製したメタルハライドランプを示
す模式図FIG. 2 is a schematic view showing a metal halide lamp manufactured using a discharge tube for a high-pressure discharge lamp according to an embodiment of the present invention.
１ 石英ガラス管体 ２ ガスバーナー ３ 成型用金型 ４ 成型用ブローガス ５ タングステン電極 ６ モリブデン箔 ７ 外部引出し電極 ８ 発光管体 DESCRIPTION OF SYMBOLS 1 Quartz glass tube 2 Gas burner 3 Mold for molding 4 Blow gas for molding 5 Tungsten electrode 6 Molybdenum foil 7 External extraction electrode 8 Light emitting tube
Claims (1)
気体を前記中空放電管体内部に導入して加熱軟化した領
域を成型する工程を有する高圧放電ランプ用の放電管体
の製造方法であって、 前記中空放電管体内部に導入する気体として、Ｈｅもし
くは、少なくとも５体積％以上のＨｅを含有した気体を
用いることを特徴とする高圧放電ランプ用の放電管体の
製造方法。A step of heating and softening the hollow discharge tube;
A method for producing a discharge tube for a high-pressure discharge lamp, comprising a step of molding a region softened by heating by introducing a gas into the inside of the hollow discharge tube, wherein He is used as a gas introduced into the hollow discharge tube. Alternatively, a method for producing a discharge tube for a high-pressure discharge lamp, wherein a gas containing at least 5% by volume or more of He is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23633296A JPH1083761A (en) | 1996-09-06 | 1996-09-06 | Manufacture of discharge tube for high pressure discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23633296A JPH1083761A (en) | 1996-09-06 | 1996-09-06 | Manufacture of discharge tube for high pressure discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1083761A true JPH1083761A (en) | 1998-03-31 |
Family
ID=16999244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23633296A Pending JPH1083761A (en) | 1996-09-06 | 1996-09-06 | Manufacture of discharge tube for high pressure discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1083761A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101044330B1 (en) | 2009-07-09 | 2011-06-29 | 주식회사 캡쎈 | Halogen Lamp for Headlight of Vehicle and Method for Manufacturing the Same |
-
1996
- 1996-09-06 JP JP23633296A patent/JPH1083761A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101044330B1 (en) | 2009-07-09 | 2011-06-29 | 주식회사 캡쎈 | Halogen Lamp for Headlight of Vehicle and Method for Manufacturing the Same |
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