JPH1064481A - Ceramic tube for discharge lamp and manufacture thereof - Google Patents

Ceramic tube for discharge lamp and manufacture thereof

Info

Publication number
JPH1064481A
JPH1064481A JP21826096A JP21826096A JPH1064481A JP H1064481 A JPH1064481 A JP H1064481A JP 21826096 A JP21826096 A JP 21826096A JP 21826096 A JP21826096 A JP 21826096A JP H1064481 A JPH1064481 A JP H1064481A
Authority
JP
Japan
Prior art keywords
ceramic
ceramic tube
discharge lamp
light emitting
tube
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
Application number
JP21826096A
Other languages
Japanese (ja)
Inventor
Katsumi Nakamura
勝美 中村
Shinichi Takemura
真一 竹村
Shunichi Murakawa
俊一 村川
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.)
Kyocera Corp
Original Assignee
Kyocera Corp
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 Kyocera Corp filed Critical Kyocera Corp
Priority to JP21826096A priority Critical patent/JPH1064481A/en
Publication of JPH1064481A publication Critical patent/JPH1064481A/en
Pending legal-status Critical Current

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Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve the linear permeability in a ceramic tube, having a discharge light-emitting unit of which inner diameter is larger than that of the opening by bonding plural blocks so as to form a ceramic tube, and specifying the number of holes of a bonding surface. SOLUTION: Ceramic raw material (for example, YAG) is molded and baked so as to manufacture a block body of which discharge light emitting unit 2a is divided into two or more, and polishing is performed to an inner and an outer wall surfaces, forming the discharge light-emitting units 2a of the block body, and polishing is performed to a bonding surface thereof so as to set the mean roughness of a central axis at 0.2μ or less. The paste made of the same ceramic material as the block body and the hardening resin (for example, epoxy resin) is coated on the bonding surface of the block body, and vacuum defoaming is performed so as to form a bonded body. Or vacuum defoaming is performed after forming the bonding body, and two or more blocks are bonded, and thereafter, burning and polishing are performed so as to form a ceramic tube 2, and the number of holes with 2μ or more of the maximum diameter existing in a cross section of the bonding surface is set at 30 or less per 500μ.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、優れた直線透過率
を有する放電灯用セラミック管とその製造方法に関する
ものであり、具体的にはキセノンランプ、ナトリウムラ
ンプ、ハロゲンランプ、メタルハライドランプ等の放電
灯用発光管に使用するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp ceramic tube having excellent linear transmittance and a method for producing the same, and more particularly, to a discharge tube for a xenon lamp, a sodium lamp, a halogen lamp, a metal halide lamp, and the like. It is used for an arc tube for electric lights.

【0002】[0002]

【従来の技術】従来、道路やトンネルなどの照明等には
高圧ナトリウムランプが、自動車などのライト類には高
い発光効率を有するキセノンランプやハロゲンランプ
が、屋内外などの照明や店舗などの一般照明、さらには
OHP用や液晶プロジェクタ用のバックライトなどには
演色性に優れたメタルハライドランプなどの放電灯用発
光管が使用されている。
2. Description of the Related Art Conventionally, high-pressure sodium lamps are used for lighting of roads and tunnels, xenon lamps and halogen lamps having high luminous efficiency are used for lights of automobiles, etc. 2. Description of the Related Art An arc tube for a discharge lamp such as a metal halide lamp having excellent color rendering properties is used for lighting, and further for a backlight for an OHP or a liquid crystal projector.

【0003】例えば、メタルハライドランプに使用され
ている放電灯用発光管は、図3に示すように、中央に球
面状の放電発光部12aを有する略円筒状をしたセラミ
ック管12の内部に、発光材料として金属ハロゲン化物
と希ガスを封入し、上記セラミック管12の両端開口部
12bを電極心棒15とリード心棒16をそれぞれ具備
する閉塞体13でもって封止したものがあった。
For example, as shown in FIG. 3, an arc tube for a discharge lamp used for a metal halide lamp has a light emission tube inside a substantially cylindrical ceramic tube 12 having a spherical discharge light emitting portion 12a in the center. In some cases, a metal halide and a rare gas are sealed as materials, and the openings 12b at both ends of the ceramic tube 12 are sealed with closing members 13 each having an electrode mandrel 15 and a lead mandrel 16.

【0004】ところで、中央に球面状の放電発光部12
aを有するセラミック管12を製造する方法としては、
次のような方法が提案されている。
By the way, a spherical discharge light emitting portion 12 is provided at the center.
As a method of manufacturing the ceramic tube 12 having a
The following methods have been proposed.

【0005】まず、セラミック原料に粘結剤、溶媒を添
加してセラミック坏土を製作し、該セラミック坏土を押
し出し形成法により円筒状の成形体としたあと、内面形
状が球面状をした成形型のキャビティー内に上記成形体
を配置し、該成形体の一方端を閉塞するとともに、他方
端に圧縮気体を供給して成形型の内面形状に対応させる
ことにより、中央に球面状の放電発光部を有する略円筒
状の成形体とし、該成形体を焼成したあと、外表面を研
磨することにより中央に球面状の放電発光部12aを有
する放電灯用セラミック管12を製造することが提案さ
れている(特公昭64−6008号公報参照)。
[0005] First, a binder and a solvent are added to a ceramic raw material to produce a ceramic body, and the ceramic body is extruded into a cylindrical molded body, and then formed into a cylindrical body having a spherical inner surface. By disposing the molded body in the cavity of the mold and closing one end of the molded body and supplying compressed gas to the other end to correspond to the inner surface shape of the mold, a spherical discharge is formed at the center. It is proposed to manufacture a discharge lamp ceramic tube 12 having a spherical discharge light emitting portion 12a in the center by calcining the formed body and polishing the outer surface thereof after forming a substantially cylindrical shaped body having a light emitting portion. (See Japanese Patent Publication No. 64-6008).

【0006】また、他の製造方法としては、内面形状が
球面状をした成形型のキャビティーに、セラミック管2
の内面形状に対応する外面形状を有する水溶性樹脂を含
んだ中子を配設し、上記成形型と中子とで形成される空
間にセラミック原料、粘結剤、溶媒からなるセラミック
坏土を充填して固化させたのち、中子と一体をなす成形
体を成形型から取り出し、次に、上記中子を水と接触さ
せて水溶性樹脂を溶解させることにより中子を除去し、
得られた成形体を焼成したのち外表面を研磨することに
より、中央に球面状の放電発光部12aを有する放電灯
用セラミック管12を製造することが提案されている
(特開平7−47518号公報参照)。
Further, as another manufacturing method, a ceramic tube 2 is placed in a cavity of a mold having a spherical inner surface.
A core containing a water-soluble resin having an outer surface shape corresponding to the inner surface shape is provided, and a ceramic material, a binder, and a ceramic clay including a solvent are provided in a space formed by the molding die and the core. After filling and solidifying, the molded body integral with the core is taken out of the mold, and then the core is removed by contacting the core with water to dissolve the water-soluble resin,
It has been proposed to produce a ceramic tube 12 for a discharge lamp having a spherical discharge light emitting portion 12a in the center by firing the obtained molded body and then polishing the outer surface thereof (Japanese Patent Application Laid-Open No. 7-47518). Gazette).

【0007】[0007]

【発明が解決しようとする課題】ところが、上述のよう
な方法により製造された放電灯用セラミック管12は、
つなぎ目のない一体品であり、また、これらのセラミッ
ク管12の両端に開口する開口部12bの断面積は3m
2 程度と非常に小さいことから、セラミック管12の
内壁面、特に発光特性に大きな影響を与える放電発光部
12aの内壁面に研摩加工を施すことができなかった。
しかも、一体品のセラミック管12では均一な肉厚をも
った放電発光部12aを構成することは難しいものであ
った。その為、放電発光部12aの内壁面における光の
乱反射等によりセラミック管12の直線透過率を向上さ
せることができないといった課題があった。
However, the ceramic tube 12 for a discharge lamp manufactured by the above-described method has the following disadvantages.
The ceramic tube 12 is a seamless, one-piece product.
Since it is very small, i.e., about m 2, the inner wall surface of the ceramic tube 12, particularly the inner wall surface of the discharge light emitting portion 12 a, which greatly affects the light emission characteristics, could not be polished.
Moreover, it is difficult to form the discharge light emitting portion 12a having a uniform thickness with the ceramic tube 12 as an integral product. Therefore, there is a problem that the linear transmittance of the ceramic tube 12 cannot be improved due to irregular reflection of light on the inner wall surface of the discharge light emitting portion 12a.

【0008】また、少しでもセラミック管12の直線透
過率を向上させるために、腐食性液による化学研磨を施
すことも行われているが、この研磨方法では内壁面の鋭
利な凹凸を丸みをもった凹凸にする程度であり、放電発
光部12a内の変形や数百ミクロン程度の凹凸を除去す
ることができないために、セラミック管12の直線透過
率を大幅に向上させるには至っていなかった。
In order to improve the linear transmittance of the ceramic tube 12 even a little, chemical polishing using a corrosive liquid is performed. However, in this polishing method, sharp irregularities on the inner wall surface are rounded. However, the linear transmittance of the ceramic tube 12 has not been significantly improved because the deformation in the discharge light emitting portion 12a and the unevenness of about several hundred microns cannot be removed.

【0009】[0009]

【発明の目的】本発明の目的は、従来一体品が一般的で
あるセラミック管を少なくとも2つ以上に分割したセラ
ミック分割体を接合した接合構造体とすることで、放電
発光部の内壁面に研磨加工を施し、優れた直線透過率を
有する放電灯用セラミック管とその製造方法を提供する
ことにある。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a joint structure in which a ceramic tube, which is conventionally a common integral product, is divided into at least two or more ceramic tubes and joined to the inner wall surface of the discharge light emitting portion. An object of the present invention is to provide a ceramic tube for a discharge lamp which is polished and has an excellent linear transmittance, and a method for manufacturing the same.

【0010】[0010]

【課題を解決するための手段】そこで、本発明は上記課
題に鑑み、内径が開口部よりも大きい放電発光部を有す
るセラミック管において、該セラミック管は少なくとも
2つ以上のセラミック分割体を接合してなる接合部を有
するとともに、該接合部の断面に存在する最大径が2μ
m以上の気孔の数を500μm当たり30個以下となる
ようにしたものである。
SUMMARY OF THE INVENTION In view of the above problems, the present invention is directed to a ceramic tube having a discharge light emitting portion having an inner diameter larger than an opening, the ceramic tube joining at least two or more ceramic divided bodies. And the maximum diameter existing in the cross section of the joint is 2 μm.
The number of pores of m or more is 30 or less per 500 μm.

【0011】また、本発明は上記放電灯用セラミック管
を製造するために、 A.セラミック原料を成形・焼成して上記セラミック管
の放電発光部を2つ以上に分割してなるセラミック分割
体を製作する工程と、 B.上記セラミック分割体の放電発光部を構成する内外
壁面に研磨加工を施すとともに、接合面にも研磨加工を
施してその中心線平均粗さ(Ra)を0.2μm以下と
する工程と、 C.前記セラミック分割体と同材質のセラミック原料と
硬化性樹脂からなるセラミックペーストをセラミック分
割体の接合面に塗布して真空脱泡処理を施したのち接合
体を形成するか、あるいはセラミックペーストを前記セ
ラミック分割体の接合面に塗布して接合体を形成したの
ち真空脱泡処理を施す工程と、 D.上記接合体を焼成したのち、外表面に研摩加工を施
す工程とから製造したものである。
The present invention also provides a method for manufacturing the above-mentioned ceramic tube for a discharge lamp, which comprises the steps of: B. forming and firing a ceramic raw material to produce a ceramic divided body obtained by dividing the discharge light emitting portion of the ceramic tube into two or more parts; B. polishing the inner and outer wall surfaces constituting the discharge light emitting portion of the ceramic divided body, and also polishing the joining surface to reduce the center line average roughness (Ra) to 0.2 μm or less; A ceramic paste composed of a ceramic raw material and a curable resin of the same material as the ceramic divided body is applied to a bonding surface of the ceramic divided body and subjected to vacuum defoaming processing to form a bonded body, or the ceramic paste is formed of the ceramic paste. D. applying a vacuum to defoaming after applying to the joint surface of the divided body to form a joined body; After the above-mentioned bonded body is fired, the outer surface is polished.

【0012】さらに、本発明は、前記放電灯用セラミッ
ク管を、Al、Y、Mg、Zr、Ca、Ybのうち1種
以上の化合物からなる焼結体で構成したものである。
Further, according to the present invention, the ceramic tube for a discharge lamp is formed of a sintered body made of at least one of Al, Y, Mg, Zr, Ca and Yb.

【0013】[0013]

【発明の実施の形態】即ち、本発明の放電灯用セラミッ
ク管は、図1(a)〜(c)に示すような中央を球面状
に構成した放電発光部2aを有する略円筒状をしたもの
や、図1(d)に示すような先端に球面状の放電発光部
2aを有するフラスコ状をしたものなど、内径が開口部
2bよりも大きい放電発光部2aを有してなり、上記放
電発光部2aの内壁面に研磨加工を施すために、少なく
とも2つ以上のセラミック分割体を接合した接合部7を
有する接合構造体からなるものである。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The ceramic tube for a discharge lamp of the present invention has a substantially cylindrical shape having a discharge light emitting portion 2a having a spherical center at the center as shown in FIGS. 1 (a) to 1 (c). And a discharge light emitting portion 2a having an inner diameter larger than the opening 2b, such as a container having a spherical shape and a discharge light emitting portion 2a at the tip as shown in FIG. In order to polish the inner wall surface of the light emitting portion 2a, the light emitting portion 2a is formed of a bonding structure having a bonding portion 7 in which at least two or more ceramic divided bodies are bonded.

【0014】具体的には図1(a)、(d)に示すよう
に、放電発光部2aを横割りに分割したセラミック分割
体同士を接合して構成したものや、図1(b)に示すよ
うに、放電発光部2aを縦割りに分割したセラミック分
割体同士を接合して構成したもの、さらには図1(c)
に示すように、放電発光部2aの上下部で3つのパーツ
に分割したセラミック分割体同士をそれぞれ接合して構
成したものなど、上記放電発光部2aの内壁面に研磨加
工を施すことができるように分割したセラミック分割体
同士を接合して構成すれば良い。なお、図1(a)〜
(c)に示すセラミック管2を用いて放電灯用発光管を
構成する場合、図2(a)に示すように内部に発光材料
等を充填したセラミック管2の両端開口部2bを電極心
棒5とリード心棒6をそれぞれ具備する閉塞体3でもっ
て封止すれば良く、図1(d)に示すセラミック管2を
用いて放電灯用発光管を構成する場合、図2(b)に示
すように内部に発光材料等を充填したセラミック管2の
開口部2bに、電極心棒5とリード心棒6をそれぞれ具
備してなり、各電極心棒5間を絶縁層4により絶縁した
円筒状の閉塞体3でもって封止すれば良い。
More specifically, as shown in FIGS. 1A and 1D, the discharge light emitting portion 2a is formed by joining ceramic divided bodies divided horizontally, or as shown in FIG. 1B. As shown, the discharge light emitting section 2a is formed by joining ceramic divided bodies divided vertically, and further, FIG. 1 (c)
As shown in the figure, the inner wall surface of the discharge light emitting unit 2a can be polished, for example, by joining ceramic divided bodies divided into three parts at the upper and lower parts of the discharge light emitting unit 2a. What is necessary is just to join and combine the ceramic divided bodies divided into. In addition, FIG.
When an arc tube for a discharge lamp is formed by using the ceramic tube 2 shown in FIG. 2C, as shown in FIG. 2A, both end openings 2b of the ceramic tube 2 filled with a luminescent material or the like are connected to the electrode mandrel 5 as shown in FIG. It is sufficient to seal with a closing body 3 having a lead mandrel 6 and a lead mandrel 6, respectively. When a discharge tube luminous tube is formed using the ceramic tube 2 shown in FIG. 1D, as shown in FIG. An electrode mandrel 5 and a lead mandrel 6 are respectively provided in an opening 2b of a ceramic tube 2 filled with a luminescent material or the like, and a cylindrical closed body 3 insulated between the electrode mandrels 5 by an insulating layer 4. What is necessary is just to seal it.

【0015】このように、本発明の放電灯用セラミック
管2は接合構造体としてあることから、従来では不可能
であった放電発光部2aの内壁面に研磨加工を施すこと
ができ、放電発光部2aの厚みを均一に仕上げることが
できるとともに、内壁面において凹凸のない滑らかな面
とすることができるため、セラミック管2の直線透過率
を大幅に向上させることができる。
As described above, since the discharge lamp ceramic tube 2 of the present invention is a joint structure, it is possible to polish the inner wall surface of the discharge light emitting portion 2a, which was impossible in the prior art, and to discharge the light. Since the thickness of the portion 2a can be made uniform and the inner wall surface can be made smooth without any irregularities, the linear transmittance of the ceramic tube 2 can be greatly improved.

【0016】ただし、上記放電灯用セラミック管2の接
合部7にはできるだけで大きな気孔が存在しないように
することが必要である。
However, it is necessary that the joint 7 of the discharge lamp ceramic tube 2 has as few pores as possible.

【0017】即ち、放電灯用発光管を発光させる場合、
発光材料を放電により気化させ、その時に発する発光材
料特有の光により発光させるようになっているのである
が、発光材料が気化することに伴ってセラミック管2の
内圧が上昇するとともに、発光時にはセラミック管2の
内部が1100〜1300℃程度にまで達するというよ
うに、セラミック管2は過酷な条件に曝されることか
ら、セラミック管2の接合部7に大きな気孔が多数存在
すると強度不足のために、接合部7にクラックが発生し
て封入物である発光材料や希ガスなどがリークしたりあ
るいはセラミック管2が破損する恐れがあるからであ
る。
That is, when the discharge lamp arc tube is made to emit light,
The light emitting material is vaporized by discharge, and light is emitted by light peculiar to the light emitting material emitted at that time. However, as the light emitting material evaporates, the internal pressure of the ceramic tube 2 increases, and at the time of light emission, the ceramic tube becomes The ceramic tube 2 is exposed to severe conditions such that the inside of the tube 2 reaches about 1100 to 1300 ° C., and if a large number of large pores are present in the joint 7 of the ceramic tube 2, the strength is insufficient. This is because a crack may be generated in the joint portion 7 and the light emitting material or rare gas, which is an enclosure, may leak, or the ceramic tube 2 may be damaged.

【0018】その為、セラミック管2の接合部7の強度
はセラミックス本来の強度と同等または近似したレベル
にまで高める必要があり、そのためには接合部7の断面
に存在する最大径が2μm以上の気孔の数を500μm
当たり30個以下となるようにすることが重要である。
Therefore, it is necessary to increase the strength of the joint 7 of the ceramic tube 2 to a level equal to or close to the original strength of the ceramic. For this purpose, the maximum diameter existing in the cross section of the joint 7 is 2 μm or more. 500 μm pores
It is important that the number be 30 or less.

【0019】一方、このような放電灯用セラミック管2
を製造するには、まず、セラミック原料に分散剤、バイ
ンダーを加えて泥漿を作製する。上記セラミック原料と
してはBa3 Al2 6 、BaZrO3 、Ca3 Al2
6 、CaZrO3 、Mg2TiO4 、ZrO2 、Y2
3 、Yb2 3 、MgAl2 4 、Y3 Al5 12
AlNなどを用いることができ、このうち特にY3 Al
5 12などの立方晶の結晶構造を有するセラミックスは
粒界面における光の複屈折が少ないためにより高い直線
透過率が得られ、セラミック管2を構成するのに好適で
ある。
On the other hand, such a discharge lamp ceramic tube 2
First, a slurry is prepared by adding a dispersant and a binder to a ceramic raw material. Ba 3 Al 2 O 6 , BaZrO 3 , Ca 3 Al 2
O 6 , CaZrO 3 , Mg 2 TiO 4 , ZrO 2 , Y 2
O 3 , Yb 2 O 3 , MgAl 2 O 4 , Y 3 Al 5 O 12 ,
AlN or the like can be used, and among them, Y 3 Al
Ceramics having a cubic crystal structure, such as 5 O 12, have less birefringence of light at the grain interface, and therefore have higher linear transmittance, and are suitable for forming the ceramic tube 2.

【0020】次に、得られた泥漿を成形型内に充填して
鋳込成形法や射出成形法などの通常のセラミック成形法
にてセラミック管2の放電発光部2aを2つ以上に分割
したセラミック分割体をなす成形体を形成し、該成形体
を各セラミック原料を焼結させることができる温度にて
焼成することでセラミック分割体を製作する。
Next, the obtained slurry was filled in a mold, and the discharge light emitting portion 2a of the ceramic tube 2 was divided into two or more parts by a usual ceramic molding method such as a casting method or an injection molding method. A molded body forming a ceramic divided body is formed, and the molded body is fired at a temperature at which each ceramic raw material can be sintered to produce a ceramic divided body.

【0021】得られたセラミック分割体は、放電発光部
2aを構成する内外壁面をダイヤモンド砥粒やバフ研磨
により鏡面状に加工するとともに、接合面を中心線平均
粗さ(Ra)で0.2μm以下に研磨加工する。ここ
で、接合面の面粗さを中心線平均粗さ(Ra)で0.2
μm以下とするのは、これより接合面が粗くなると後述
するセラミックペーストを塗布した時に接合面の窪みに
気泡が入り込み易くなり、該気泡を除去するため処理を
施したとしても十分に除去することができず、そのまま
焼成して接合させると、上記気泡が接合部7において気
孔として存在することから接合部7の強度を大幅に低下
させてしまうからである。
In the obtained ceramic divided body, the inner and outer wall surfaces constituting the discharge light emitting portion 2a are mirror-finished by diamond abrasive grains or buff polishing, and the joint surface has a center line average roughness (Ra) of 0.2 μm. Polishing is performed below. Here, the surface roughness of the joint surface is defined as a center line average roughness (Ra) of 0.2.
When the bonding surface is made coarser than this, air bubbles easily enter into the dents of the bonding surface when a ceramic paste described later is applied, and sufficiently removed even if a treatment is performed to remove the air bubbles. This is because if the cells are fired and joined as they are, the strength of the joint 7 is greatly reduced because the bubbles exist as pores in the joint 7.

【0022】一方、上記セラミック分割体を接合して放
電灯用セラミック管2を形成するために、セラミック分
割体と同材質のセラミック原料と硬化性樹脂からなるセ
ラミックペーストを用意する。ここで使用する硬化性樹
脂としては熱硬化性樹脂、光硬化性樹脂、嫌気性樹脂な
ど接着効果を有するものを使用する必要があり、これら
の樹脂は一液性や二液性のいずれであっても構わない。
On the other hand, in order to form the ceramic tube 2 for a discharge lamp by joining the above-mentioned ceramic divided bodies, a ceramic paste made of a ceramic material of the same material as that of the ceramic divided bodies and a curable resin is prepared. As the curable resin used here, it is necessary to use a resin having an adhesive effect such as a thermosetting resin, a photocurable resin, or an anaerobic resin, and these resins are either one-part or two-part. It does not matter.

【0023】具体的には熱硬化性樹脂としてエポキシ、
フェノール、ウレタン、メラミン、ユリア、不飽和樹脂
等を使用することができ、光硬化性樹脂としてはウレタ
ンアクリレート、嫌気性樹脂としてはジアクリレートな
どを使用することができる。
Specifically, epoxy as the thermosetting resin,
Phenol, urethane, melamine, urea, unsaturated resins, and the like can be used. Urethane acrylate can be used as the photocurable resin, and diacrylate can be used as the anaerobic resin.

【0024】さらに上記硬化性樹脂に可塑性樹脂として
ポリスチレン、アクリル、ポリビニルアルコール、セル
ロース及び共重合体を混ぜて使用しても良い。
Further, polystyrene, acryl, polyvinyl alcohol, cellulose, and a copolymer may be used as a plastic resin in the curable resin.

【0025】そして、上記セラミックペーストを各セラ
ミック分割体の接合面に塗布し、各セラミック分割体の
接合面同士を当接させることにより少なくとも1つの開
口部2bを備え、放電発光部2aの内径が上記開口部2
bの内径より大きい接合体を形成する。この時、塗布す
るペーストの厚みは接合部7の強度を高める観点からも
できるだけで薄い方が好ましく、5〜200μmの範囲
で設けることが好ましい。
Then, the ceramic paste is applied to the joining surfaces of the respective ceramic divided bodies, and the joining surfaces of the respective ceramic divided bodies are brought into contact with each other, so that at least one opening 2b is provided. Opening 2
A joined body larger than the inner diameter of b is formed. At this time, the thickness of the paste to be applied is preferably as thin as possible from the viewpoint of increasing the strength of the bonding portion 7, and is preferably provided in the range of 5 to 200 μm.

【0026】また、得られた接合体の接合層には大きな
気泡が多数存在し、このままの状態で焼結・接合させる
と接合部7に多数の気孔が形成され、接合部7の強度が
大きく低下する。
Further, a large number of large air bubbles are present in the bonding layer of the obtained bonded body, and when sintering and bonding are performed in this state, a large number of pores are formed in the bonded portion 7 and the strength of the bonded portion 7 is increased. descend.

【0027】その為、上記接合体を真空度を適宜調整し
た真空雰囲気中に配置して真空脱泡処理を施すことで、
接合層に存在する気泡を除去したあと、セラミックペー
スト中の樹脂成分を硬化させる。なお、セラミックペー
ストをセラミック分割体の接合面に塗布した段階で真空
脱泡処理を施し、その後気泡が入らないように接合して
接合体を形成しても良い。
For this reason, the above joined body is placed in a vacuum atmosphere in which the degree of vacuum is appropriately adjusted, and subjected to a vacuum defoaming treatment.
After removing the bubbles present in the bonding layer, the resin component in the ceramic paste is cured. Note that a vacuum defoaming process may be performed at the stage where the ceramic paste is applied to the bonding surfaces of the ceramic divided bodies, and then the bonded bodies may be formed by bonding such that bubbles do not enter.

【0028】次に、真空脱泡処理を終えた接合体に予備
焼成を施して接合層を構成するセラミックペース中の樹
脂成分を加熱分解させるとともに、さらに本焼成を施す
ことによりセラミック分割体の接合面同士を焼結させて
接合する。ただし、本焼成はセラミック分割体を製作し
た時の焼成温度より50℃程度低い温度で焼成すること
が好ましい。
Next, the joined body after the vacuum defoaming treatment is subjected to pre-sintering to thermally decompose the resin component in the ceramic paste constituting the joining layer, and further to the main sintering to join the divided ceramic bodies. The surfaces are sintered and joined. However, it is preferable that the main firing be performed at a temperature lower by about 50 ° C. than the firing temperature when the ceramic divided body was manufactured.

【0029】そして、得られたセラミック管2の外表面
は焼成により若干粗れているため、バフ研摩などの研磨
加工を施して鏡面状とすることにより本発明に係る放電
灯用セラミック管2を得ることができる。
Since the outer surface of the obtained ceramic tube 2 is slightly roughened by sintering, the surface of the ceramic tube 2 for a discharge lamp according to the present invention is made mirror-finished by polishing such as buffing. Obtainable.

【0030】このように、本発明の製造方法では、放電
発光部を2つ以上に分割してなるセラミック分割体を作
製し、その放電発光部の内外壁面を研磨するとともに、
接合面を中心線平均粗さ(Ra)で0.2μm以下と
し、この接合面にセラミック分割体と同材質のセラミッ
ク原料と硬化性樹脂からなるセラミックペーストを塗布
して接合体を形成し、該接合体に真空脱泡処理を施した
のち焼成し、しかるのち外壁面を研磨するようにしたこ
とから、セラミック管2の接合部7には殆ど気孔がな
く、接合部7の強度を一体品のセラミック管と同等レベ
ルとすることができる。しかも、本発明ではセラミック
管2の放電発光部2aの内壁面にも研磨加工を施すこと
ができるため、優れた直線透過率を有する放電灯用セラ
ミック管2を得ることができる。
As described above, according to the manufacturing method of the present invention, a ceramic divided body obtained by dividing the discharge light emitting portion into two or more parts is manufactured, and the inner and outer wall surfaces of the discharge light emitting portion are polished.
The joining surface is made to have a center line average roughness (Ra) of 0.2 μm or less, and a ceramic paste made of a ceramic material and a curable resin of the same material as the ceramic divided body is applied to the joining surface to form a joined body. Since the bonded body is subjected to vacuum defoaming treatment and then fired, and then the outer wall surface is polished, the bonded portion 7 of the ceramic tube 2 has almost no pores, and the strength of the bonded portion 7 It can be at the same level as a ceramic tube. In addition, in the present invention, since the inner wall surface of the discharge light emitting portion 2a of the ceramic tube 2 can be polished, the ceramic tube 2 for a discharge lamp having excellent linear transmittance can be obtained.

【0031】[0031]

【実施例】【Example】

(実施例1)Y3 Al5 12(以下、YAGと略称す
る)焼結体からなる図1(a)に示す放電灯用セラミッ
ク管2の製造方法について説明する。
(Example 1) A method for manufacturing a ceramic tube 2 for a discharge lamp shown in FIG. 1A made of a sintered body of Y 3 Al 5 O 12 (hereinafter abbreviated as YAG) will be described.

【0032】ポットミルにイオン交換水と分散剤を投入
し、これらに高純度アルミナボールを加えて分散剤を均
一に分散させたあと、平均粒子径が0.8μmのYAG
原料を投入してさらに6時間程度混合粉砕する。その
後、アルミナボールを取り除いた泥漿を成形型に充填し
て鋳込成形法により成形したあと成形型から取り出して
放電発光部2aで横割りに2分割した漏斗状の成形体を
形成し、該成形体を真空雰囲気中にて1800〜200
0℃の温度で6時間焼成することにより漏斗状をした2
つのセラミック分割体を製作した。
Ion-exchanged water and a dispersant are charged into a pot mill, and high-purity alumina balls are added thereto to uniformly disperse the dispersant. Then, YAG having an average particle diameter of 0.8 μm is added.
The raw materials are charged and mixed and pulverized for about 6 hours. Thereafter, the slurry from which the alumina balls had been removed was filled into a mold, molded by a casting method, taken out of the mold, and formed into a funnel-shaped molded body divided into two by a discharge light emitting portion 2a. 1800-200 in a vacuum atmosphere
Baking at a temperature of 0 ° C. for 6 hours gave a funnel-shaped 2
One ceramic split was made.

【0033】得られたセラミック分割体はダイヤモンド
砥粒により放電発光部2aを構成する内壁面に研磨加工
を施すとともに、放電発光部2aを構成する外壁面をバ
フ研磨により鏡面状に加工し、さらに接合面を中心線平
均粗さ(Ra)で0.08μmに研磨加工した。
The obtained ceramic divided body is polished by diamond abrasive grains on the inner wall surface constituting the discharge light emitting portion 2a, and the outer wall surface constituting the discharge light emitting portion 2a is mirror-finished by buff polishing. The joint surface was polished to a center line average roughness (Ra) of 0.08 μm.

【0034】一方、接合層として上記セラミック分割体
と同材質のYAG原料をエポキシ系樹脂と混合してセラ
ミックペーストを製作し、該ペーストを前記セラミック
分割体の接合面に塗布したあと、他方のセラミック分割
体の接合面を貼り合わせて接合体を形成した。
On the other hand, a YAG raw material of the same material as the above-mentioned ceramic divided body is mixed with an epoxy resin as a bonding layer to produce a ceramic paste, and the paste is applied to the bonding surface of the ceramic divided body. The joined surfaces of the divided bodies were bonded to form a joined body.

【0035】この時、セラミック分割体の開口部には中
心軸のずれが生じないようにするために、開口部とほぼ
同径の支持棒を挿通させて置く。
At this time, in order to prevent the center axis from being shifted in the opening of the ceramic divided body, a support rod having substantially the same diameter as the opening is inserted.

【0036】この状態で接合体をデシケータ内に配置し
て真空脱泡処理を施すことにより接合層中の気泡を除去
したのち、熱風乾燥機にて80℃に加熱することで接合
層をなすセラミックペースト中の樹脂成分を硬化させて
仮接合した。
In this state, the bonded body is placed in a desiccator and subjected to a vacuum defoaming treatment to remove bubbles in the bonding layer, and then heated to 80 ° C. with a hot air drier to form a ceramic forming the bonding layer. The resin component in the paste was cured and temporarily joined.

【0037】次に、上記接合体を900〜1200℃の
温度で2時間予備焼成を施して接合層中の樹脂成分を加
熱分解させるとともに、さらにセラミック分割体を焼成
した時の焼成温度より50℃低い1750〜1950℃
で6時間本焼成することにより接合面同士が完全に焼結
したセラミック管2を形成し、しかるのち、該セラミッ
ク管2の外壁面にバフ研摩を施すことにより、YAG焼
結体からなる中央に球面状の放電発光部2aを有する略
円筒状の放電灯用セラミック管2を製作した。
Next, the above-mentioned joined body is pre-sintered at a temperature of 900 to 1200 ° C. for 2 hours to thermally decompose the resin component in the joining layer, and is further heated to 50 ° C. below the sintering temperature at the time of sintering the ceramic divided body. Low 1750-1950 ° C
For 6 hours to form a ceramic tube 2 in which the joining surfaces are completely sintered. Thereafter, the outer wall surface of the ceramic tube 2 is subjected to buff polishing, so that the center of the YAG sintered body is formed. A substantially cylindrical ceramic lamp 2 for a discharge lamp having a spherical discharge light emitting portion 2a was manufactured.

【0038】また、このセラミック管2を切断し、接合
部7の断面を200倍に拡大したSEM写真を撮影し、
500μm当たりにおける最大径が2μm以上の気孔の
数を測定したところ4個であった。
Further, the ceramic tube 2 was cut, and an SEM photograph in which the cross section of the joint 7 was magnified 200 times was taken.
When the number of pores having a maximum diameter of 2 μm or more per 500 μm was measured, it was four.

【0039】(実施例2)AlN焼結体からなる図1
(d)に示す放電灯用セラミック管2の製造方法につい
て説明する。
Example 2 FIG. 1 made of AlN sintered body
A method for manufacturing the discharge lamp ceramic tube 2 shown in FIG.

【0040】ポットミルにアルコールと分散剤を投入
し、これらに樹脂ボールを加えて分散剤を均一に分散さ
せたあと、平均粒子径が0.8μmのAlN原料を投入
してさらに6時間程度混合粉砕する。その後、樹脂ボー
ルを取り除いた泥漿を成形型に充填して鋳込成形したあ
と成形型から取り外してセラミック管2の放電発光部2
aで横割りに2分割した漏斗状の成形体と、半球状の成
形体をそれぞれ形成し、各成形体を窒素雰囲気中にて1
600〜2100℃の温度で6時間焼成することにより
漏斗状のセラミック分割体と半球状のセラミック分割体
を製作した。
An alcohol and a dispersant are charged into a pot mill, and a resin ball is added thereto to uniformly disperse the dispersant. Then, an AlN raw material having an average particle diameter of 0.8 μm is charged and mixed and pulverized for about 6 hours. I do. Thereafter, the mold from which the resin balls have been removed is filled in a mold, cast and molded, and then removed from the mold to discharge the light emitting portion 2 of the ceramic tube 2.
a to form a funnel-shaped molded body and a hemispherical molded body, each of which is divided horizontally into two parts.
By sintering at a temperature of 600 to 2100 ° C. for 6 hours, a funnel-shaped ceramic divided body and a hemispherical ceramic divided body were produced.

【0041】得られたセラミック分割体はダイヤモンド
砥粒により放電発光部2aを構成する内壁面に研磨加工
を施すとともに、放電発光部2aを構成する外壁面をバ
フ研磨により鏡面状に加工し、さらに接合面を中心線平
均粗さ(Ra)で0.1μmに研磨加工した。
The obtained ceramic divided body is polished by diamond abrasive grains on the inner wall surface constituting the discharge light emitting portion 2a, and the outer wall surface constituting the discharge light emitting portion 2a is mirror-finished by buff polishing. The joint surface was polished to a center line average roughness (Ra) of 0.1 μm.

【0042】一方、接合層として上記セラミック分割体
と同材質のAlN原料をエポキシ系樹脂と混合してセラ
ミックペーストを製作し、該ペーストを前記セラミック
分割体の接合面に塗布したあと、他方のセラミック分割
体の接合面を貼り合わせて接合体を形成した。
On the other hand, an AlN raw material of the same material as that of the above-mentioned ceramic divided body is mixed with an epoxy resin as a bonding layer to produce a ceramic paste, and the paste is applied to the bonding surface of the ceramic divided body. The joined surfaces of the divided bodies were bonded to form a joined body.

【0043】この状態で接合体をデシケータ内に配置し
て真空脱泡処理を施すことにより接合層中の気泡を除去
したのち、熱風乾燥機にて80℃に加熱することで接合
層をなすセラミックペースト中の樹脂成分を硬化させて
仮接合した。
In this state, the bonded body is placed in a desiccator and subjected to vacuum defoaming treatment to remove bubbles in the bonding layer, and then heated to 80 ° C. with a hot air drier to form a ceramic forming the bonding layer. The resin component in the paste was cured and temporarily joined.

【0044】次に、上記接合体を600〜1000℃の
温度で10時間予備焼成することにより接合層中の樹脂
成分を加熱分解させるとともに、さらにセラミック分割
体の焼成温度より50℃低い1550〜2050℃程度
で6時間本焼成することにより接合面同士が完全に焼結
したセラミック管2を形成し、しかるのち、該セラミッ
ク管2の外壁面にバフ研磨を施すことにより、AlN焼
結体からなる先端に球面状の放電発光部2aを有するフ
ラスコ状をした放電灯用セラミック管2を製作した。
Next, the resin component in the bonding layer is thermally decomposed by pre-baking the above-mentioned bonded body at a temperature of 600 to 1000 ° C. for 10 hours, and further, 1550 to 2050, which is 50 ° C. lower than the firing temperature of the ceramic divided body. A ceramic tube 2 in which the joining surfaces are completely sintered is formed by performing main firing at about 6 ° C. for 6 hours, and thereafter, an outer wall surface of the ceramic tube 2 is buff-polished to form an AlN sintered body. A flask-shaped ceramic tube 2 for a discharge lamp having a spherical discharge light emitting portion 2a at the tip was manufactured.

【0045】また、上記セラミック管2を切断し、接合
部7の断面を200倍に拡大したSEM写真を撮影し、
500μm当たりにおける最大径が2μm以上の気孔の
数を測定したところ8個であった。
Further, the ceramic tube 2 was cut, and an SEM photograph in which the cross section of the joint 7 was magnified 200 times was taken.
When the number of pores having a maximum diameter of 2 μm or more per 500 μm was measured, it was eight.

【0046】(実施例3)Y2 3 焼結体からなる図1
(a)に示す放電灯用セラミック管2の製造方法につい
て説明する。
Example 3 FIG. 1 made of a Y 2 O 3 sintered body
A method for manufacturing the discharge lamp ceramic tube 2 shown in FIG.

【0047】ポットミルにイオン交換水と分散剤を投入
し、これらに高純度アルミナボールを加えて分散剤を均
一に分散させたあと、平均粒子径が0.9μmのY2
3 原料とThO2 を助剤として10モル%投入して混合
する。その後、アルミナボールを取り除いた泥漿を成形
型に充填して鋳込成形したあと成形型から取り出してセ
ラミック管2の放電発光部2aで横割りに2分割した漏
斗状の成形体を形成し、該成形体を水素雰囲気中にて2
000〜2300℃の温度で1.5時間焼成することに
より漏斗状の2つのセラミック分割体を得た。
Ion-exchanged water and a dispersant are put into a pot mill, and high-purity alumina balls are added thereto to uniformly disperse the dispersant. Then, Y 2 O having an average particle diameter of 0.9 μm is added.
(3) The raw materials and ThO 2 are added as auxiliary agents at 10 mol% and mixed. Thereafter, the slurry from which the alumina balls had been removed was filled into a molding die and cast-molded, and then taken out of the molding die to form a funnel-like molded body divided horizontally into two by the discharge light emitting portion 2a of the ceramic tube 2. Press the molded body in a hydrogen atmosphere 2
By baking at a temperature of 000 to 2300 ° C. for 1.5 hours, two funnel-shaped ceramic divided bodies were obtained.

【0048】得られたセラミック分割体はダイヤモンド
砥粒により放電発光部2aを構成する内壁面に研磨加工
を施すとともに、放電発光部2aを構成する外壁面をバ
フ研磨により鏡面状に加工し、さらに接合面を中心線平
均粗さ(Ra)で0.1μm以下に研磨加工した。
The obtained ceramic divided body is polished with diamond abrasive grains on the inner wall surface constituting the discharge light emitting portion 2a, and the outer wall surface constituting the discharge light emitting portion 2a is mirror-finished by buff polishing. The joining surface was polished to a center line average roughness (Ra) of 0.1 μm or less.

【0049】一方、接合層として上記セラミック分割体
と同材質のY2 3 原料とThO2をエポキシ系樹脂と
混合してセラミックペーストを製作し、該ペーストを前
記セラミック分割体の接合面に塗布したあと、デシケー
タ内に配置して真空脱泡処理を施すことにより接合層中
の気泡を除去したあと、他方のセラミック分割体を接合
面同士で貼り合わせて接合体とし、該接合体を熱風乾燥
機にて80℃に加熱することで接合層中の樹脂成分を硬
化させて仮接合した。
On the other hand, a ceramic paste is produced by mixing a Y 2 O 3 raw material and ThO 2 of the same material as the above-mentioned ceramic divided body with an epoxy resin as a bonding layer, and applying the paste to the joint surface of the ceramic divided body. After removing the air bubbles in the bonding layer by placing in a desiccator and performing vacuum defoaming treatment, the other ceramic divided body is bonded to each other at the bonding surfaces to form a bonded body, and the bonded body is dried with hot air. The resin component in the bonding layer was cured by heating to 80 ° C. with a machine, and was temporarily bonded.

【0050】次に、上記接合体を大気雰囲気中にて12
00℃前後の温度で2時間予備焼成することにより接合
層中の樹脂成分を加熱分解させるとともに、さらに水素
雰囲気中でセラミック分割体の焼成温度より50℃低い
1950〜2250℃で1.5時間本焼成することによ
り接合面同士が完全に焼結したセラミック管2を形成
し、しかるのち、該セラミック管2の外壁面にバフ研磨
を施すことにより、Y23 焼結体からなる中央に球面
状の放電発光部2aを有する略円筒状をした放電灯用セ
ラミック管2を得た。
Next, the above joined body was placed in an air atmosphere for 12 hours.
The resin component in the bonding layer is thermally decomposed by pre-firing at a temperature of about 00 ° C. for 2 hours, and is further heated at 1950-2250 ° C. lower than the firing temperature of the ceramic divided body by 50 ° C. for 1.5 hours in a hydrogen atmosphere. By sintering, a ceramic tube 2 whose joining surfaces are completely sintered is formed. Thereafter, the outer wall surface of the ceramic tube 2 is subjected to buff polishing, thereby forming a spherical surface in the center made of a Y 2 O 3 sintered body. A ceramic tube 2 for a discharge lamp having a substantially cylindrical shape and having a discharge light emitting portion 2a in the shape of a cylinder was obtained.

【0051】また、上記セラミック管2を切断し、接合
部7の断面を200倍に拡大したSEM写真を撮影し、
500μm当たりにおける最大径が2μm以上の気孔の
数を測定したところ5個であった。
Further, the ceramic tube 2 was cut, and a SEM photograph in which the cross section of the joint 7 was magnified 200 times was taken.
When the number of pores having a maximum diameter of 2 μm or more per 500 μm was measured, it was five.

【0052】(実施例4)MgAl2 4 焼結体からな
る図1(c)に示す放電灯用セラミック管2の製造方法
について説明する。
(Example 4) A method for manufacturing a ceramic tube 2 for a discharge lamp shown in FIG. 1C made of a sintered body of MgAl 2 O 4 will be described.

【0053】ポットミルにイオン交換水と分散剤を投入
し、これらに高純度アルミナボールを加えて分散剤を均
一に分散させたあと、平均粒子径が0.8μmのMgA
24 原料を投入してさらに6時間程度混合粉砕す
る。その後、アルミナボールを取り除いた泥漿を成形型
に充填して鋳込成形したあと成形型から取り出して漏斗
状の2つの成形体と外壁面が曲面状をした略円筒状の成
形体をそれぞれ形成し、各成形体を真空雰囲気中にて1
900℃の温度で8時間焼成することにより漏斗状をし
た2つのセラミック分割体と外壁面が曲面状をした略円
筒状のセラミック分割体をそれぞれ作製した。そして、
これらセラミック分割体の放電発光部2aを構成する内
壁面をダイヤモンド砥粒にて研磨加工を施すとともに、
放電発光部2aを構成する外壁面をバフ研磨により鏡面
に加工し、さらに接合面を中心線平均粗さ(Ra)で
0.2μmに研磨加工した。
Ion-exchanged water and a dispersant are put into a pot mill, and high-purity alumina balls are added thereto to uniformly disperse the dispersant. Then, MgA having an average particle diameter of 0.8 μm is added.
l 2 0 4 raw material mixture is milled further to 6 hours was charged. Thereafter, the slurry from which the alumina balls had been removed was filled into a mold and cast-molded, and then taken out of the mold to form two funnel-shaped molded bodies and a substantially cylindrical molded body having a curved outer wall surface. , Each molded body in vacuum atmosphere
By baking at 900 ° C. for 8 hours, two funnel-shaped ceramic divided bodies and a substantially cylindrical ceramic divided body having a curved outer wall surface were produced. And
While the inner wall surface constituting the discharge light emitting portion 2a of these ceramic divided bodies is polished with diamond abrasive grains,
The outer wall surface of the discharge light emitting portion 2a was mirror-finished by buffing, and the joint surface was polished to a center line average roughness (Ra) of 0.2 μm.

【0054】一方、接合層として上記セラミック分割体
と同材質のMgAl2 4 原料をエポキシ樹脂と混合し
てセラミックペーストを製作し、該ペーストを前記略円
筒状をしたセラミック分割体の両端の接合面にそれぞれ
塗布したあと、漏斗状をしたセラミック分割体の接合面
を貼り合わせて接合体を形成した。
On the other hand, the ceramic split body and MgAl 2 0 4 material made of the same material was mixed with an epoxy resin to prepare a ceramic paste, joining the ends of the ceramic split body the paste was the substantially cylindrical as a bonding layer After each application to the surfaces, the bonding surfaces of the funnel-shaped ceramic divided bodies were bonded to form a bonded body.

【0055】この状態で接合体をデシケータ内に配置し
て真空脱泡処理を施すことにより接合層中の気泡を除去
したあと、熱風乾燥機にて80℃に加熱することで接合
層中の樹脂成分を硬化させて仮接合した。
In this state, the bonded body is placed in a desiccator and subjected to a vacuum defoaming treatment to remove bubbles in the bonded layer, and then heated to 80 ° C. with a hot air drier to remove the resin in the bonded layer. The components were cured and temporarily joined.

【0056】次に、上記接合体を大気雰囲気中にて12
00℃前後の温度で30分間予備焼成することにより接
合層中の樹脂成分を加熱分解させるとともに、真空雰囲
気中でセラミック分割体の焼成温度より50℃低い18
50℃で8時間焼成することにより接合面同士が完全に
焼結したセラミック管2を形成し、しかるのち、該セラ
ミック管2の外壁面にバフ研磨を施すことにより、Mg
Al2 4 焼結体からなる中央に球面状の放電発光部2
aを有する略円筒状をした放電灯用セラミック管2を得
た。
Next, the above joined body was placed in an air atmosphere for 12 hours.
The resin component in the bonding layer is thermally decomposed by pre-firing at a temperature of about 00 ° C. for 30 minutes, and the temperature is lower by 50 ° C. than the firing temperature of the ceramic divided body in a vacuum atmosphere.
By sintering at 50 ° C. for 8 hours, the joined surfaces are completely sintered to form a ceramic tube 2, and thereafter, the outer wall surface of the ceramic tube 2 is buffed to obtain Mg.
A spherical discharge light emitting portion 2 made of Al 2 O 4 sintered body in the center
A substantially cylindrical ceramic tube 2 for a discharge lamp having a was obtained.

【0057】また、上記セラミック管2を切断し、接合
部7の断面を200倍に拡大したSEM写真を撮影し、
500μm当たりにおける最大径が2μm以上の気孔の
数を測定したところ7個であった。
Further, the ceramic tube 2 was cut, and an SEM photograph in which the cross section of the joint 7 was enlarged 200 times was taken.
When the number of pores having a maximum diameter of 2 μm or more per 500 μm was measured, it was seven.

【0058】(実験例)そこで、実施例1の製造方法に
おいて、セラミック分割体の接合時における真空脱泡処
理の真空度を適宜調整して接合部7に存在する気孔の数
を異ならせたYAG焼結体からなる放電灯用セラミック
管2を用意し、これらのセラミック管2の破壊強度につ
いて測定を行った。
(Experimental Example) Therefore, in the manufacturing method of Example 1, the degree of vacuum in the vacuum defoaming process at the time of joining the ceramic divided bodies was appropriately adjusted to change the number of pores existing in the joint 7. Discharge lamp ceramic tubes 2 made of a sintered body were prepared, and the breaking strength of these ceramic tubes 2 was measured.

【0059】本実験では中央の曲面状をした放電発光部
2aの内径が5mm、肉厚が1mmのセラミック管2を
用い、簡易的に測定するために、セラミック管2の一方
の開口部2bを気密に閉塞し、他方の開口部2bより水
圧をかけた時に破損する水圧を破壊強度として測定し
た。
In this experiment, the centrally curved discharge light emitting portion 2a uses a ceramic tube 2 having an inner diameter of 5 mm and a wall thickness of 1 mm. For simple measurement, one opening 2b of the ceramic tube 2 is used. The water pressure, which is airtightly closed and breaks when water pressure is applied from the other opening 2b, was measured as the breaking strength.

【0060】そして、この種のセラミック管2において
要求されている破壊強度は約50kg/cm2 程度であ
るが、実際には使用時における温度条件によって強度が
約1/3程度にまで低下するとともに、温度分布に伴う
熱応力による影響もあることから本実験では安全率を3
倍に設定し、破壊強度が450kg/cm2 以上である
ものを優れたものとした。
The breaking strength required for this type of ceramic tube 2 is about 50 kg / cm 2 , but in practice the strength is reduced to about 1/3 depending on the temperature conditions during use. In this experiment, the safety factor was 3 because of the influence of thermal stress accompanying the temperature distribution.
It was set to twice and the one with a breaking strength of 450 kg / cm 2 or more was regarded as excellent.

【0061】各セラミック管2の接合部7における気孔
の数およびそれぞれの結果は表1に示す通りである。
The number of pores at the joint 7 of each ceramic tube 2 and the respective results are as shown in Table 1.

【0062】[0062]

【表1】 [Table 1]

【0063】この結果、接合部7の断面において500
μm当たりにおける最大長さ2μm以上の気孔の数が少
なくなるにつれて破壊強度が向上することが判る。そし
て、最大長さ2μm以上の気孔の数が30個より多くな
ると、接合部7における十分な強度が得られず、破壊強
度450kg/cm2 以上を満足することができなかっ
た。
As a result, 500 in the cross section of the joint 7
It can be seen that the breaking strength improves as the number of pores having a maximum length of 2 μm or more per μm decreases. When the number of pores having a maximum length of 2 μm or more is more than 30, sufficient strength at the joint 7 cannot be obtained, and the breaking strength of 450 kg / cm 2 or more cannot be satisfied.

【0064】これに対し、接合部7の断面において50
0μm当たりにおける最大長さ2μm以上の気孔の数を
30個以下とすれば、接合部7における破壊強度を45
0kg/cm2 以上とすることができ、基準値を満足す
ることができた。
On the other hand, in the cross section of the joint 7, 50
If the number of pores having a maximum length of 2 μm or more per 0 μm is 30 or less, the breaking strength at the joint 7 is 45
0 kg / cm 2 or more, and the reference value could be satisfied.

【0065】このことから、接合部7の断面において最
大2μm以上の気孔の数を500μm当たり30個以下
とすれば、充分な接合強度を有する放電灯用セラミック
管2が得られることが判る。
From this, it can be seen that when the number of pores having a maximum of 2 μm or more in the cross section of the joint 7 is 30 or less per 500 μm, a ceramic tube 2 for a discharge lamp having a sufficient joint strength can be obtained.

【0066】なお、本実験では放電灯用セラミック管2
をYAG焼結体により形成した例を示したが、他のセラ
ミックスにより形成したものでも同様の傾向が見られ
た。
In this experiment, the discharge lamp ceramic tube 2 was used.
Was formed by using a YAG sintered body, but the same tendency was observed in the case of using other ceramics.

【0067】[0067]

【発明の効果】以上のように、本発明によれば、内径が
開口部よりも大きい放電発光部を有するセラミック管に
おいて、該セラミック管は少なくとも2つ以上のセラミ
ック分割体を接合してなる接合部を有するとともに、該
接合部の断面に存在する最大径が2μm以上の気孔の数
を500μm当たり30個以下としたことにより、接合
構造体であるにもかかわらず、充分な接合強度を有する
とともに、優れた直線透過率をもったセラミック管とす
ることができる。その為、本発明の放電灯用セラミック
管を用いて放電灯用発光管を構成すれば、優れた発光効
率を有するとともに高い耐久性を兼ね備えた長寿命の発
光管を提供することができる。
As described above, according to the present invention, in a ceramic tube having a discharge light emitting portion having an inner diameter larger than the opening, the ceramic tube is formed by joining at least two or more ceramic divided bodies. And having a maximum diameter of 2 μm or more in the cross section of the joint at 30 μm or less per 500 μm, so that the joint has sufficient joint strength despite being a joint structure. And a ceramic tube having excellent linear transmittance. Therefore, if a discharge lamp arc tube is formed using the discharge lamp ceramic tube of the present invention, a long-life arc tube having excellent luminous efficiency and high durability can be provided.

【0068】また、本発明は、上記セラミック管を放電
発光部で2つ以上に分割してなるセラミック分割体を作
製し、その放電発光部を構成する内外壁面に研磨加工を
施すとともに、接合面を中心線平均粗さ(Ra)で0.
2μm以下とし、この接合面にセラミック分割体と同材
質のセラミック原料と硬化性樹脂からなるセラミックペ
ーストを塗布して各セラミック分割体を接合することに
より接合体を形成し、該接合体に真空脱泡処理を施した
のち焼成し、しかるのち外壁面に研磨加工を施して製造
するようにしたことから、セラミック管の接合部には殆
ど気孔がなく、接合部の強度を一体品のセラミック管と
同等レベルとすることができる。しかも、本発明ではセ
ラミック管の放電発光部の内面にも研磨加工を施すこと
ができるため、優れた直線透過率を有する放電灯用セラ
ミック管を提供することができる。
The present invention also provides a ceramic divided body obtained by dividing the above-mentioned ceramic tube into two or more parts by a discharge light emitting part, and polishing and polishing the inner and outer wall surfaces constituting the discharge light emitting part. With a center line average roughness (Ra) of 0.
2 μm or less, a ceramic paste composed of a ceramic material of the same material as that of the ceramic divided body and a curable resin is applied to this joint surface, and the ceramic divided bodies are joined to form a joined body. Since the foam was treated and fired, and then the outer wall surface was polished and manufactured, the joints of the ceramic tube had almost no pores, and the strength of the joint was reduced to that of the integrated ceramic tube. It can be equivalent level. Moreover, in the present invention, since the inner surface of the discharge light emitting portion of the ceramic tube can be polished, a ceramic tube for a discharge lamp having excellent linear transmittance can be provided.

【図面の簡単な説明】[Brief description of the drawings]

【図1】(a)〜(d)は本発明に係る放電灯用セラミ
ック管を示す斜視図である。
FIGS. 1A to 1D are perspective views showing a ceramic tube for a discharge lamp according to the present invention.

【図2】(a)は図1(a)の放電灯用セラミック管を
用いて構成した放電灯用発光管を示す縦断面図であり、
(b)は図1(d)の放電灯用セラミック管を用いて構
成した放電灯用発光管を示す縦断面図である。
FIG. 2A is a longitudinal sectional view showing a discharge lamp arc tube constituted by using the discharge lamp ceramic tube of FIG. 1A;
FIG. 2B is a longitudinal sectional view showing a discharge lamp arc tube constituted by using the discharge lamp ceramic tube of FIG.

【図3】一般的な放電灯用発光管を示す縦断面図であ
る。
FIG. 3 is a longitudinal sectional view showing a general arc tube for a discharge lamp.

【符号の説明】[Explanation of symbols]

2 ・・・放電灯用セラミック管 2a・・・放電発光部 2b・・・開口部 7 ・・・接合部 2 ... ceramic tube for discharge lamp 2a ... discharge light emitting part 2b ... opening 7 ... joining part

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】内径が開口部よりも大きい放電発光部を有
するセラミック管において、該セラミック管は少なくと
も2つ以上のセラミック分割体を接合してなる接合部を
有するとともに、該接合部の断面に存在する最大径が2
μm以上の気孔の数を500μm当たり30個以下とし
たことを特徴とする放電灯用セラミック管。
1. A ceramic tube having a discharge light-emitting portion having an inner diameter larger than an opening portion, said ceramic tube having a joining portion formed by joining at least two or more ceramic divided bodies, and having a cross section of said joining portion. The maximum diameter that exists is 2
A ceramic tube for a discharge lamp, wherein the number of pores having a size of at least 30 μm is not more than 30 per 500 μm.
【請求項2】内径が開口部よりも大きい放電発光部を有
する放電灯用セラミック管の製造方法において、 A.セラミック原料を成形・焼成して上記セラミック管
の放電発光部を2つ以上に分割してなるセラミック分割
体を製作する工程と、 B.上記セラミック分割体の放電発光部を構成する内外
壁面に研磨加工を施すとともに、接合面にも研磨加工を
施してその中心線平均粗さ(Ra)を0.2μm以下と
する工程と、 C.前記セラミック分割体と同材質のセラミック原料と
硬化性樹脂からなるセラミックペーストをセラミック分
割体の接合面に塗布して真空脱泡処理を施したのち接合
体を形成するか、あるいはセラミックペーストを前記セ
ラミック分割体の接合面に塗布して接合体を形成したの
ち真空脱泡処理を施す工程と、 D.上記接合体を焼成したのち、研磨加工を施す工程と
からなる放電灯用セラミック管の製造方法。
2. A method for manufacturing a discharge lamp ceramic tube having a discharge light emitting portion having an inner diameter larger than an opening portion, comprising: B. forming and firing a ceramic raw material to produce a ceramic divided body obtained by dividing the discharge light emitting portion of the ceramic tube into two or more parts; B. polishing the inner and outer wall surfaces constituting the discharge light emitting portion of the ceramic divided body, and also polishing the joining surface to reduce the center line average roughness (Ra) to 0.2 μm or less; A ceramic paste composed of a ceramic raw material and a curable resin of the same material as the ceramic divided body is applied to a bonding surface of the ceramic divided body and subjected to vacuum defoaming processing to form a bonded body, or the ceramic paste is formed of the ceramic paste. D. applying a vacuum to defoaming after applying to the joint surface of the divided body to form a joined body; A method of producing a ceramic tube for a discharge lamp, comprising a step of subjecting the joined body to firing and then subjecting the joined body to polishing.
【請求項3】前記放電灯用セラミック管を構成する材質
が、Al、Y、Mg、Zr、Ca、Ybのうち1種以上
の化合物からなる請求項1及び請求項2に記載の放電灯
用セラミック管及びその製造方法。
3. The discharge lamp for a discharge lamp according to claim 1, wherein the material constituting the ceramic tube for the discharge lamp is at least one compound selected from the group consisting of Al, Y, Mg, Zr, Ca and Yb. Ceramic tube and manufacturing method thereof.
JP21826096A 1996-08-20 1996-08-20 Ceramic tube for discharge lamp and manufacture thereof Pending JPH1064481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21826096A JPH1064481A (en) 1996-08-20 1996-08-20 Ceramic tube for discharge lamp and manufacture thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21826096A JPH1064481A (en) 1996-08-20 1996-08-20 Ceramic tube for discharge lamp and manufacture thereof

Publications (1)

Publication Number Publication Date
JPH1064481A true JPH1064481A (en) 1998-03-06

Family

ID=16717094

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21826096A Pending JPH1064481A (en) 1996-08-20 1996-08-20 Ceramic tube for discharge lamp and manufacture thereof

Country Status (1)

Country Link
JP (1) JPH1064481A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0954010A1 (en) * 1998-04-28 1999-11-03 General Electric Company Ceramic discharge chamber for a discharge lamp
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JP2002164019A (en) * 2000-11-22 2002-06-07 Ngk Insulators Ltd Light emitting vessel for high pressure discharge lamp
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US7297037B2 (en) 1998-04-28 2007-11-20 General Electric Company Ceramic discharge chamber for a discharge lamp
JP2009530127A (en) * 2006-03-24 2009-08-27 日本碍子株式会社 Method for producing sintered body and sintered body
US7691765B2 (en) 2005-03-31 2010-04-06 Fujifilm Corporation Translucent material and manufacturing method of the same
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0954011A1 (en) * 1998-04-28 1999-11-03 General Electric Company Ceramic discharge chamber for a discharge lamp
US6583563B1 (en) 1998-04-28 2003-06-24 General Electric Company Ceramic discharge chamber for a discharge lamp
US6791266B2 (en) 1998-04-28 2004-09-14 General Electric Company Ceramic discharge chamber for a discharge lamp
EP0954010A1 (en) * 1998-04-28 1999-11-03 General Electric Company Ceramic discharge chamber for a discharge lamp
US7297037B2 (en) 1998-04-28 2007-11-20 General Electric Company Ceramic discharge chamber for a discharge lamp
JP4709361B2 (en) * 1999-09-29 2011-06-22 オスラム シルヴェニア インコーポレイテッド Ceramic arc tube
EP1089321A1 (en) * 1999-09-29 2001-04-04 Osram Sylvania Inc. Ceramic arc tube
JP2001118543A (en) * 1999-09-29 2001-04-27 Osram Sylvania Inc Ceramic light arc tube
JP2002141021A (en) * 2000-10-31 2002-05-17 Ngk Insulators Ltd Light emitting vessel for high pressure discharge lamp
JP2002164019A (en) * 2000-11-22 2002-06-07 Ngk Insulators Ltd Light emitting vessel for high pressure discharge lamp
KR100670193B1 (en) * 2005-03-02 2007-01-17 주식회사 기노리 Method for manufacturing ceramic arc tube
US7691765B2 (en) 2005-03-31 2010-04-06 Fujifilm Corporation Translucent material and manufacturing method of the same
JP2009530127A (en) * 2006-03-24 2009-08-27 日本碍子株式会社 Method for producing sintered body and sintered body
US8585960B2 (en) 2006-03-24 2013-11-19 Ngk Insulators, Ltd. Method for producing sintered body, and sintered body
JP2010123323A (en) * 2008-11-18 2010-06-03 Ushio Inc Excimer discharge lamp and method for manufacturing excimer discharge lamp
US8283865B2 (en) 2008-11-18 2012-10-09 Ushio Denki Kabushiki Kaisha Excimer discharge lamp and method of making the same
JP2010257848A (en) * 2009-04-27 2010-11-11 Koito Mfg Co Ltd Vehicular headlight
WO2015098927A1 (en) * 2013-12-25 2015-07-02 株式会社ニコン Calcium fluoride member, method for producing same, and method for pressure-bonding calcium fluoride crystal

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