JPH04141947A - Ceramic discharge lamp - Google Patents
Ceramic discharge lampInfo
- Publication number
- JPH04141947A JPH04141947A JP26153690A JP26153690A JPH04141947A JP H04141947 A JPH04141947 A JP H04141947A JP 26153690 A JP26153690 A JP 26153690A JP 26153690 A JP26153690 A JP 26153690A JP H04141947 A JPH04141947 A JP H04141947A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- arc tube
- curved part
- cooling member
- emission 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
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000004031 devitrification Methods 0.000 abstract description 7
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- 150000004706 metal oxides Chemical class 0.000 abstract description 2
- 229910000679 solder Inorganic materials 0.000 abstract description 2
- 238000005488 sandblasting Methods 0.000 abstract 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 11
- 229910052708 sodium Inorganic materials 0.000 description 11
- 239000011734 sodium Substances 0.000 description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- MJGFBOZCAJSGQW-UHFFFAOYSA-N mercury sodium Chemical compound [Na].[Hg] MJGFBOZCAJSGQW-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910001023 sodium amalgam Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［発明の目的コ
（産業上の利用分野）
本発明は湾曲部を有する高圧ナトリウムランプなどのセ
ラミック放電ランプに関する。DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a ceramic discharge lamp, such as a high-pressure sodium lamp, having a curved section.
（従来の技術）
例えば高圧ナトリウムランプは、透光性アルミナチュー
ブよりなる発光管の両端に電極を気密に封着し、この発
光管内に発光物質としてナトリウム、緩衝用金属として
水銀、および始動用希ガスを封入して構成しである。(Prior Art) For example, in a high-pressure sodium lamp, electrodes are hermetically sealed at both ends of an arc tube made of a translucent alumina tube, and inside the arc tube are sodium as a luminescent material, mercury as a buffer metal, and diluted starting material. It is constructed by sealing gas.
透光性アルミナチューブは耐熱性に優れ、かつナトリウ
ムに対する耐蝕性に優れているので、この種の高圧ナト
リウムランプの発光管に好適である。A translucent alumina tube has excellent heat resistance and corrosion resistance against sodium, and is therefore suitable for the arc tube of this type of high-pressure sodium lamp.
しかしながら透光性アルミナチューブは通常のガラスと
異なり高温下においても軟化し難いので従来、押し出し
成形により成形された直線状チュヘブをそのままバルブ
として使用しており、したがって発光管は直管形をなし
ている。However, unlike ordinary glass, translucent alumina tubes do not easily soften even at high temperatures, so conventionally, straight tubes formed by extrusion molding have been used as bulbs, and therefore arc tubes have a straight tube shape. There is.
ところで、最近高圧金属蒸気放電灯が屋内照明の光源に
採用される傾向にあり、このためランプの小形化が要求
されている。By the way, there is a recent tendency for high-pressure metal vapor discharge lamps to be used as light sources for indoor lighting, and therefore there is a demand for miniaturization of the lamps.
上記高圧ナトリウムランプを小形化する上では、発光管
サイズの縮小が重要な課題となり、その対策の１つとし
て、バルブの途中をＵ字またはコ字形などに湾曲形にす
ることが考えられる。In reducing the size of the high-pressure sodium lamp, reducing the size of the arc tube is an important issue, and one possible solution to this problem is to curve the middle of the bulb into a U-shape or U-shape.
発光管を湾曲形に形成すると、従来と同等の電極間距離
を保っても、スペースの小形化が可能になり、外管を小
形にすることができる。When the arc tube is formed into a curved shape, the space can be made smaller even if the distance between the electrodes is kept the same as in the conventional case, and the outer tube can be made smaller.
（発明が解決しようとする課題）
ところで、従来の直管形発光管を備えた例えば７０〜１
００ＯＷの高圧ナトリウムランプの場合、通常肉厚が０
． ５〜１．２ａｍの透光性アルミナチューブを使用し
、管壁負荷が１０〜３０Ｗ／ａ（程度で作動させている
。(Problems to be Solved by the Invention) By the way, for example, 70 to 1
In the case of a 00OW high pressure sodium lamp, the wall thickness is usually 0.
．． A translucent alumina tube of 5 to 1.2 am is used, and the tube wall load is approximately 10 to 30 W/a.
この管壁負荷が低すぎると管壁温度が十分に上昇せずラ
ンプ効率が低くなる。また逆に管壁負荷が高くなりすぎ
ると、管壁温度が高くなってアルミナの昇華を生じ、外
管の黒化を招く等の支障がある。If this tube wall load is too low, the tube wall temperature will not rise sufficiently, resulting in low lamp efficiency. On the other hand, if the load on the tube wall becomes too high, the temperature of the tube wall increases, causing sublimation of alumina, causing problems such as blackening of the outer tube.
しかして、上記のように発光管を湾曲形状とした高圧ナ
トリウムランプにあっては、湾曲部ではその内側方向に
アークが偏移することなどに伴い、発光管の湾曲部の内
側の管壁温度が著しく高温となり、発光管の失透や破損
が生じる。However, in a high-pressure sodium lamp with a curved arc tube as described above, the temperature of the tube wall inside the curved section of the arc tube increases as the arc shifts inward at the curved section. becomes extremely high temperature, causing devitrification and damage to the arc tube.
これを回避するため、管壁負荷を下げると発光効率が低
下する欠点がある。In order to avoid this, reducing the tube wall load has the drawback of reducing luminous efficiency.
本発明はこのような事情に基づきなされたもので、発光
管の効率を下げることなく、湾曲部内側の管壁の著しい
昇温を防止して、発光管の破損を防止できるセラミック
放電ランプを提供しようとするものである。The present invention has been made based on the above circumstances, and provides a ceramic discharge lamp that can prevent the arc tube from being damaged by preventing a significant temperature rise of the tube wall inside the curved portion without reducing the efficiency of the arc tube. This is what I am trying to do.
Ｕ発明の構成コ
（課題を解決するための手段）
上記課題を解決するために本発明のセラミック放電ラン
プは、透光性セラミックチューブよりなる気密容器内に
発光金属、緩衝用金属および始動用希ガスが封入され、
両端部に電極が封装された発光管と、この発光管を気密
に収容する外管とを備えたセラミック放電ランプであり
、発光管には湾曲部が形成されていると共に、この湾曲
部の内周外面に冷却部材が付設されていることを特徴と
するものである。Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the ceramic discharge lamp of the present invention contains a luminescent metal, a buffer metal, and a starting rare metal in an airtight container made of a translucent ceramic tube. gas is enclosed,
This is a ceramic discharge lamp that includes an arc tube with electrodes sealed at both ends and an outer bulb that airtightly houses the arc tube. It is characterized in that a cooling member is attached to the outer peripheral surface.
（作用）
本発明においては、発光管には湾曲部が形成されており
、さらに湾曲部の内周外面に冷却部材が付設されている
ため、湾曲部の内側の著しい昇温が低減できて、発光管
の失透や破損を防止できるセラミック放電ランプを提供
できる。(Function) In the present invention, the curved portion is formed in the arc tube, and the cooling member is attached to the inner peripheral outer surface of the curved portion, so that significant temperature rise inside the curved portion can be reduced. It is possible to provide a ceramic discharge lamp that can prevent devitrification and damage to the arc tube.
（実施例） 本発明の一実施例を図面を参照して詳細に説明する。(Example) An embodiment of the present invention will be described in detail with reference to the drawings.
第１図に本発明に係る高圧ナトリウムランプを示すよう
に、例えば石英ガラスからなる外管１は一端がステム２
で封止してあり、外側にねじ込み形などの口金３を装着
している。As shown in FIG. 1, a high-pressure sodium lamp according to the present invention, an outer tube 1 made of, for example, quartz glass has one end connected to a stem 2.
It is sealed with a screw-type cap 3 on the outside.
また、この外管１内には、例えばアルゴン、クリプトン
、キセノン、窒素等の不活性ガスが１５〜５００Ｔｏｒ
ｒ程度封入されており、またこの外管１内には、発光管
４が収容されている。In addition, an inert gas such as argon, krypton, xenon, nitrogen, etc. is contained in the outer tube 1 at a pressure of 15 to 500 Torr.
The outer tube 1 is filled with an arc tube 4, and an arc tube 4 is housed inside the outer tube 1.
発光管４は、内径が約７． ２５ｍ１、平均外径が約８
．７５＋ｌ＋ｓの透光性アルミナチューブよりなり図示
の如く例えばＵ字を呈する形状に成形されている。The arc tube 4 has an inner diameter of about 7. 25m1, average outer diameter approximately 8
．． It is made of a 75+l+s translucent alumina tube and is formed into a U-shaped shape, for example, as shown in the figure.
この発光管４の両端の開口部は、金属酸化物等のソルダ
ーを介して例えばセラミックディスク（図示せず）で閉
塞され、このセラミックディスクで電極５．５を支持さ
せている。The openings at both ends of the arc tube 4 are closed with, for example, ceramic discs (not shown) via solder such as metal oxide, and the electrodes 5.5 are supported by the ceramic discs.
ここで、この発光管４は、バルブ中心線上を通る電極間
距離を約９０１１１Ｉ１１としてあり、湾曲部６の中心
を通る曲率が約７．５＋＋＋＋とされ、発光管４の高さ
は略４０１ＩｌｌＩに設定されている。Here, in this arc tube 4, the distance between the electrodes passing on the bulb center line is approximately 90111I11, the curvature passing through the center of the curved portion 6 is approximately 7.5++++, and the height of the arc tube 4 is set to approximately 401IllI. has been done.
この発光管４の内部には、ナトリウム比が１０乃至２５
重量比のナトリウムアマルガムと、始動用希ガスとして
２０乃至７００Ｔｏｒｒのキセノンガスが封入されてい
る。Inside this arc tube 4, the sodium ratio is 10 to 25.
A weight ratio of sodium amalgam and xenon gas of 20 to 700 Torr as a starting rare gas are sealed.
上記電極５．５に接続されたリード線７．７はサポート
ワイヤ８．８に接続されており、これらサポートワイヤ
８，８はステム２を気密に貫通して口金３に接続されて
いる。The lead wire 7.7 connected to the electrode 5.5 is connected to a support wire 8.8, which passes through the stem 2 in an airtight manner and is connected to the base 3.
したがって、発光管４は両端封止部が外管１の圧潰封止
部側に向けられ、湾曲部６が外管１のバルブトップ部側
に向けられて収容されているものである。Therefore, the arc tube 4 is housed with both end sealing portions facing toward the crushing sealing portion of the outer tube 1 and the curved portion 6 facing toward the bulb top portion of the outer tube 1 .
さらに、発光管４の湾曲部６の内側の間隙には、ステム
２によって支持された支持棒９によって支持された冷却
部材１０が付設されており、この冷却部材１０は湾曲部
６の内側の発光管外壁面に接している。Furthermore, a cooling member 10 supported by a support rod 9 supported by the stem 2 is attached to a gap inside the curved portion 6 of the arc tube 4. It is in contact with the outer wall of the pipe.
ここで、この冷却部材１０は、冷却効率を高めるために
、例えばセラミック等の耐熱部材の表面をサウンドブラ
ストにより粗面加工したものである。Here, the cooling member 10 is made of a heat-resistant member such as ceramic whose surface has been roughened by sound blasting in order to increase cooling efficiency.
上記のような構造のランプについて、管壁負荷を１０〜
４０ （Ｗ／ ｃ ｍ２）の範囲で変化させて、発光管
の湾曲部につき観察したところ、発光管の破損や失透は
一切生じなかった。For lamps with the above structure, the tube wall load should be 10~
When the curved portion of the arc tube was observed while changing the temperature within the range of 40 (W/cm2), no breakage or devitrification of the arc tube occurred.
これに対して、発光管４の湾曲部６の内側に冷却部材が
付設されていない放電灯を作製して、同一条件下で試験
したところ、管壁負荷の上昇に応じて、発光管の湾曲部
内側で失透が発生し、点灯時間に伴ってこの部分のクラ
ックが多発した。On the other hand, when a discharge lamp without a cooling member attached to the inside of the curved part 6 of the arc tube 4 was manufactured and tested under the same conditions, the arc tube curved as the tube wall load increased. Devitrification occurred inside the part, and cracks occurred frequently in this part as the lighting time increased.
これらの原因につき、本発明者らは検討したところ、湾
曲部を有する発光管の場合、アークが湾曲部の内側に偏
移する傾向があるため、換言すればアークが湾曲部の内
側に近づくようなるため、発光管の湾曲部の内側の温度
が著しく高温となり、これが原因して発光管にクラック
が発生ずるものと考えられた。The inventors investigated these causes and found that in arc tubes with curved parts, the arc tends to shift to the inside of the curved part.In other words, the arc tends to move closer to the inside of the curved part. As a result, the temperature inside the curved portion of the arc tube became extremely high, which was thought to be the cause of cracks in the arc tube.
そのため、上記のように発光管の湾曲部の内側に冷却部
材が付設されているものは、発光管の湾曲部の内側の管
壁温度が低くなり、その部分の失透やクラックが防止で
きるものと推察される。Therefore, as mentioned above, a cooling member is attached to the inside of the curved part of the arc tube, which lowers the tube wall temperature inside the curved part of the arc tube and prevents devitrification and cracks in that part. It is assumed that.
また、湾曲部に冷却部材が付設されているものは、その
湾曲部内側の温度が低下することに伴い、湾曲部外側の
管壁温度との差が少なくなるために、発光管の外周面に
沿った温度分布の不均衡が改善できることになり、湾曲
部での温度不均衡に起因する発光管チューブの熱歪みを
抑制することができることも相俟って、クラックの発生
が防止できるものと考えられる。In addition, in the case where a cooling member is attached to the curved part, as the temperature inside the curved part decreases, the difference between the temperature of the tube wall outside the curved part becomes smaller, and the outer peripheral surface of the arc tube decreases. We believe that this will improve the imbalance in temperature distribution along the bend, suppress the thermal distortion of the arc tube caused by temperature imbalance at the curved part, and prevent the occurrence of cracks. It will be done.
以上説明した実施例においては、発光管をＵ字状に形成
したものについて説明しているが、例えばＷ字状、コ字
状等、湾曲部が形成されたものであれば、上記実施例と
同様に適用できる。In the embodiments described above, the arc tube is formed in a U-shape. However, if the arc tube is formed with a curved part, such as a W-shape or a U-shape, the above embodiments may be used. The same applies.
また、上記実施例においては、冷却部材とじてセラミッ
クのものを用いているが、本発明はこれに限ることなく
、例えばステンレス、ニオブ等の耐熱性金属の他、各種
材料が使用できるものである。Further, in the above embodiment, a ceramic is used as the cooling member, but the present invention is not limited to this, and various materials can be used in addition to heat-resistant metals such as stainless steel and niobium. .
［発明の効果］
以上説明した本発明によれば、湾曲部の内周外面に冷却
部材が付設されているため、管壁負荷を下げることなく
湾曲部内側の管壁温度を低下させることができて、発光
管の破損や失透を防止できるセラミック放電ランプを提
供できる。[Effects of the Invention] According to the present invention described above, since the cooling member is attached to the inner peripheral outer surface of the curved portion, the temperature of the tube wall inside the curved portion can be lowered without reducing the load on the tube wall. Therefore, it is possible to provide a ceramic discharge lamp in which damage to the arc tube and devitrification can be prevented.
第１図は本発明の一実施例に係る高圧ナトリウムランプ
を示す概略図である。
１・・・・・・外管 ２・・・・・・ステム
３・・・・・・口金 ４・・・・・・発光管
５・・・・・・電極 ６・・・・・・湾曲部
７・・・・・・リード線 ８・・−・・・サポー
トワイヤ９・・・・・・支持棒 １０・・・・・
・冷却部材第
図FIG. 1 is a schematic diagram showing a high-pressure sodium lamp according to an embodiment of the present invention. 1... Outer tube 2... Stem 3... Base 4... Arc tube 5... Electrode 6... Curved Part 7...Lead wire 8...Support wire 9...Support rod 10...
・Cooling member diagram
Claims (1)
金属、緩衝用金属および始動用希ガスが封入され、両端
部に電極が封装された発光管と、前記発光管を気密に収
容する外管とを備えたセラミック放電ランプであって、
上記発光管には湾曲部が形成されていると共に、前記湾
曲部の内周外面に冷却部材が付設されていることを特徴
とするセラミック放電ランプ。A luminescent metal, a buffer metal, and a starting rare gas are sealed in an airtight container made of a translucent ceramic tube, and an arc tube has electrodes sealed at both ends, and an outer tube that airtightly houses the arc tube. A ceramic discharge lamp comprising:
A ceramic discharge lamp characterized in that the arc tube has a curved portion, and a cooling member is attached to the inner circumferential outer surface of the curved portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26153690A JPH04141947A (en) | 1990-09-30 | 1990-09-30 | Ceramic discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26153690A JPH04141947A (en) | 1990-09-30 | 1990-09-30 | Ceramic discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04141947A true JPH04141947A (en) | 1992-05-15 |
Family
ID=17363263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26153690A Pending JPH04141947A (en) | 1990-09-30 | 1990-09-30 | Ceramic discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04141947A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5643483A (en) * | 1994-04-11 | 1997-07-01 | Shin-Etsu Chemical Co., Ltd. | Ceramic heater made of fused silica glass having roughened surface |
-
1990
- 1990-09-30 JP JP26153690A patent/JPH04141947A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5643483A (en) * | 1994-04-11 | 1997-07-01 | Shin-Etsu Chemical Co., Ltd. | Ceramic heater made of fused silica glass having roughened surface |
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