JPH083994B2 - High pressure sodium lamp - Google Patents
High pressure sodium lampInfo
- Publication number
- JPH083994B2 JPH083994B2 JP20868787A JP20868787A JPH083994B2 JP H083994 B2 JPH083994 B2 JP H083994B2 JP 20868787 A JP20868787 A JP 20868787A JP 20868787 A JP20868787 A JP 20868787A JP H083994 B2 JPH083994 B2 JP H083994B2
- Authority
- JP
- Japan
- Prior art keywords
- arc tube
- tube
- hole
- pressure sodium
- sodium lamp
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 産業上の利用分野 本発明は高圧ナトリウムランプに関するものである。FIELD OF THE INVENTION The present invention relates to high pressure sodium lamps.
従来の技術 従来の高圧ナトリウムランプは、第５図に示すよう
に、透光性のアルミナ発光管８内に先端に電極２を保持
した主としてニオブからなる導電管９を発光管８の両端
部にセラミックセメント４で気密に封着しているが、導
電管９が発光管８に封着される部分では導電管９は円筒
状であり、また導電管９が貫通する穴10も円筒状であっ
た。2. Description of the Related Art In a conventional high pressure sodium lamp, as shown in FIG. 5, a conductive tube 9 mainly made of niobium having an electrode 2 held at the tip is provided in both ends of the arc tube 8 in a translucent alumina arc tube 8. Although the ceramic cement 4 is airtightly sealed, the conductive tube 9 is cylindrical in the portion where the conductive tube 9 is sealed to the arc tube 8 and the hole 10 through which the conductive tube 9 penetrates is also cylindrical. It was
発明が解決しようとする問題点 しかし、このような従来の高圧ナトリウムランプの発
光管構成では、点灯時間の進行とともに発光管１内に封
入されたナトリウムアマルガムがセラミックセメント４
と反応してナトリウムが消失し、その分発光に寄与する
ナトリウムが減少し発光色が変化するという問題があっ
た。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional arc tube structure of the high-pressure sodium lamp, the sodium amalgam enclosed in the arc tube 1 is mixed with the ceramic cement 4 as the lighting time progresses.
There is a problem that sodium reacts with and the sodium disappears, the amount of sodium that contributes to light emission decreases correspondingly, and the luminescent color changes.
本発明はこのような問題点を解決するためになされた
もので、動程中のナトリウム消失を減少させて寿命中を
通じて安定した発光色と動程特性をもたらす高圧ナトリ
ウムランプを提供するものである。The present invention has been made to solve these problems, and provides a high-pressure sodium lamp that reduces sodium loss during travel and provides stable emission color and travel characteristics throughout the life. .
問題点を解決するための手段 本発明の高圧ナトリウムランプは、先端に電極を保持
した導電管が、アルミナからなる発光管の端部に設けら
れた穴を貫通し、この穴にセラミックセメントで封着さ
れる高圧ナトリウムランプにおいて、前記導電管は封着
予定部でその外径が先端側より後端側が大きくなるよう
に変化しており、かつ前記発光管の穴の直径はこの発光
管の内部側の直径が外部側の直径より小さくなってお
り、前記導電管の外径変化部分が前記穴の内面に当接し
て当接部を形成し、前記セラミックセメントが前記当接
部より後方に位置する前記穴と前記導電管とのすき間に
充填されることにより、このセラミックセメントが前記
発光管内部の放電空間に存在しないように構成されてい
る。Means for Solving the Problems In the high-pressure sodium lamp of the present invention, a conductive tube holding an electrode at its tip penetrates a hole provided at the end of an arc tube made of alumina, and the hole is sealed with ceramic cement. In the high-pressure sodium lamp to be attached, the conductive tube is changed such that the outer diameter of the conductive tube is larger on the rear end side than on the front end side in the sealing portion, and the diameter of the hole of the arc tube is inside the arc tube. The diameter on the side is smaller than the diameter on the outside, the outer diameter changing portion of the conductive tube abuts the inner surface of the hole to form an abutting portion, and the ceramic cement is located rearward of the abutting portion. By filling the gap between the hole and the conductive tube, the ceramic cement is configured so as not to exist in the discharge space inside the arc tube.
作用 この構成により、セラミックセメントが発光管内部の
放電空間に存在しないため、ナトリウムとセラミックセ
メントとの反応を防止することができる。Action With this configuration, since the ceramic cement does not exist in the discharge space inside the arc tube, the reaction between sodium and the ceramic cement can be prevented.
実施例 以下、本発明の実施例について図面を用いて説明す
る。Embodiments Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の第１の実施例の高圧ナトリウムラン
プの発光管を示す要部断面図である。FIG. 1 is a cross-sectional view of essential parts showing an arc tube of a high pressure sodium lamp according to a first embodiment of the present invention.
第１図に示すように、本発明実施例の高圧ナトリウム
ランプの発光管は内径8.0mm,全長63mmの透光性アルミナ
発光管１からなり、その端部に形成された導電管３が貫
通する穴５は発光管内面側で直径3.2mm、発光管外面側
で直径4.5mmのテーパ状であり、その穴の厚みは4.5mmで
ある。導電管３は肉厚0.25mmのニオビウム（Nb）99％と
ジルコニウム（Zr）１％の合金からなり、発光管内部側
では3.0mm、発光管外部側では3.4mmの異径パイプであ
り、発光管１の穴５の封着予定部でその外径が前述のと
おりに変化している。そして、導電管３が穴５を貫通
し、この導電管の外径変化部分が穴５の内面に加圧当接
して当接部を形成している。セラミックセメント４はYa
2O3-SrO-CaO-Al2O3からなり、前記当接部より後方に位
置する穴５と導電管３とのすき間にだけ充填されるため
に、発光管内部の放電空間に出ることはない。導電管３
の先端には、直径0.4mmのタングステン線の２層巻コイ
ルからなる電極２がチタンろう６で気密に固定されてい
る。As shown in FIG. 1, the arc tube of the high-pressure sodium lamp of the embodiment of the present invention comprises a translucent alumina arc tube 1 having an inner diameter of 8.0 mm and a total length of 63 mm, and a conductive tube 3 formed at the end thereof penetrates through. The hole 5 is tapered with a diameter of 3.2 mm on the inner surface side of the arc tube and a diameter of 4.5 mm on the outer surface side of the arc tube, and the thickness of the hole is 4.5 mm. The conductive tube 3 is made of an alloy of 99% niobium (Nb) and 1% zirconium (Zr) with a wall thickness of 0.25 mm. It has a different diameter of 3.0 mm inside the arc tube and 3.4 mm outside the arc tube. At the planned sealing portion of the hole 5 of the tube 1, its outer diameter changes as described above. Then, the conductive tube 3 penetrates the hole 5, and the outer diameter changing portion of the conductive tube is pressed against the inner surface of the hole 5 to form a contact portion. Ceramic cement 4 is Ya
2 O 3 -SrO-CaO-Al 2 O 3 , which is filled only in the gap between the hole 5 and the conductive tube 3 located behind the abutting part, so that the discharge space inside the arc tube is exposed. There is no. Conductive tube 3
An electrode 2 composed of a two-layer wound coil of a tungsten wire having a diameter of 0.4 mm is airtightly fixed by a titanium braze 6 at the tip of the.
発光管１の他端も上記と同様な構造をとっており、両
電極間距離は31mmである。発光管１内にはナトリウム5m
g,水銀13mgおよび始動用ガスとしてのキセノンが6.6×1
03Pa封入されている。The other end of the arc tube 1 also has the same structure as described above, and the distance between both electrodes is 31 mm. 5m sodium in the arc tube 1
g, mercury 13 mg and xenon as starting gas 6.6 × 1
0 3 Pa is included.
発光管１の両端部外面には、厚さ0.02mm,幅15.5mmの
タンタルからなる保温膜（図示せず）が設けられてい
る。A heat insulating film (not shown) made of tantalum having a thickness of 0.02 mm and a width of 15.5 mm is provided on the outer surface of both ends of the arc tube 1.
かかる構造の発光管を外径が40mmの硬質ガラスからな
る直管形外管（図示せず）内に保持した。外管内はバリ
ウムゲッタを使用して高真空に排気している。The arc tube having such a structure was held in a straight tube type outer tube (not shown) made of hard glass having an outer diameter of 40 mm. The inside of the outer tube is evacuated to a high vacuum using a barium getter.
かかるランプを10灯試作し、ランプ入力150Wで5.5時
間点灯,0.5時間消灯のサイクルで寿命試験を行ったとこ
ろ、12000時間後も発光色の変化は認められず、動程特
性も安定していた。Ten such lamps were prototyped, and a life test was carried out with a lamp input of 150 W for 5.5 hours lighting and 0.5 hours extinguishing.No change in emission color was observed even after 12000 hours, and the range characteristics were stable. .
第２図は本発明の第２の実施例を示している。第２図
に示すように、アルミナ発光管１として全長63mm,内径
8.0mmのものを使用し、導電管３は第１の実施例と同仕
様のものからなる。異なるのは、穴５の内部に段差があ
ってその直径が異なっていることであり、発光管内面側
では直径3.1mm,高さ1.5mmの円筒状、発光管外面側では
直径4.1mm,高さ3.0mmの円筒状をしている。セラミック
セメント４は直径3.1mmの小円筒状部分には存在しな
い。電極間距離，発光管内封入物は第１の実施例と同じ
である。ランプも第１の実施例と同仕様とした。FIG. 2 shows a second embodiment of the present invention. As shown in Fig. 2, the alumina arc tube 1 has a total length of 63 mm and an inner diameter.
The conductor tube 3 has the same specifications as those of the first embodiment, and the diameter of the conductor tube 3 is 8.0 mm. The difference is that there is a step inside the hole 5 and the diameter is different, and the inner surface of the arc tube has a cylindrical shape with a diameter of 3.1 mm and a height of 1.5 mm, and the outer surface of the arc tube has a diameter of 4.1 mm and a height of 4.1 mm. It has a cylindrical shape with a length of 3.0 mm. The ceramic cement 4 does not exist in the small cylindrical portion having a diameter of 3.1 mm. The distance between the electrodes and the inclusion in the arc tube are the same as in the first embodiment. The lamp also had the same specifications as in the first embodiment.
かかるランプ10灯を第１の実施例と同様の条件により
点灯試験を行ったところ、12000時間後も発光色の変化
はなく、動程特性も安定していた。A lighting test was performed on 10 such lamps under the same conditions as in the first embodiment. As a result, the emission color did not change even after 12000 hours, and the travel characteristics were stable.
以上実施例として２例をあげたが、第１の実施例と同
様の発光管構造で、第３図に示すように電極２と導電管
３とを気密に封着せずに、導電管３に排気穴７を設け、
この導電管を発光管１外部で気密に圧接または溶接した
構造としたものもその効果は同じである。Two examples have been given as the above examples. However, the arc tube structure is the same as in the first example, and the electrodes 2 and the conductive tube 3 are not hermetically sealed as shown in FIG. Exhaust hole 7 is provided,
The same effect can be obtained with a structure in which this conductive tube is airtightly pressure-welded or welded outside the arc tube 1.
もちろん、第３図に示すような電極および導電管を第
２図に示すような構造の発光管端部に封着してもよい。Of course, the electrode and the conductive tube as shown in FIG. 3 may be sealed to the end portion of the arc tube having the structure as shown in FIG.
さらにアルミナ発光管として、第４図に示すような、
厚みの変化が少ないモノリシックな管を使用しても同様
の効果が得られるものである。Further, as an alumina arc tube, as shown in FIG.
The same effect can be obtained by using a monolithic tube with a small change in thickness.
発明の効果 以上説明したように、本発明は動程中の発光色変化と
ランプ電圧変化を防止できるとともに、光束維持率を向
上できるというすぐれた効果を有する高圧ナトリウムラ
ンプを提供することができるものである。EFFECTS OF THE INVENTION As described above, the present invention can provide a high-pressure sodium lamp having an excellent effect that it can prevent a change in emission color and a change in lamp voltage during a travel and can improve a luminous flux maintenance factor. Is.
第１図は本発明の第１の実施例における高圧ナトリウム
ランプの発光管の要部断面図、第２図は本発明の第２の
実施例における高圧ナトリウムランプの発光管の要部断
面図、第３図は本発明の第３の実施例における高圧ナト
リウムランプの発光管の要部断面図、第４図は本発明の
第４の実施例における高圧ナトリウムランプの発光管の
要部断面図、第５図は従来の高圧ナトリウムランプの発
光管の一部を示す断面図である。 １……アルミナ発光管、２……電極、３……導電管、４
……セラミックセメント、５……穴。FIG. 1 is a sectional view of an essential part of an arc tube of a high pressure sodium lamp according to a first embodiment of the present invention, and FIG. 2 is a sectional view of an essential part of an arc tube of a high pressure sodium lamp according to a second embodiment of the present invention. FIG. 3 is a sectional view of an essential part of an arc tube of a high-pressure sodium lamp according to a third embodiment of the present invention, and FIG. 4 is a sectional view of an essential part of an arc tube of a high-pressure sodium lamp according to a fourth embodiment of the present invention. FIG. 5 is a sectional view showing a part of an arc tube of a conventional high pressure sodium lamp. 1 ... Alumina arc tube, 2 ... Electrode, 3 ... Conductive tube, 4
... ceramic cement, 5 ... holes.
Claims (1)
からなる発光管の端部に設けられた穴を貫通し、この穴
にセラミックセメントで封着される高圧ナトリウムラン
プにおいて、前記導電管は封着予定部でその外径が先端
側より後端側が大きくなるように変化しており、かつ前
記発光管の穴の直径はこの発光管の内部側の直径が外部
側の直径より小さくなっており、前記導電管の外径変化
部分が前記穴の内面に当接して当接部を形成し、前記セ
ラミックセメントが前記当接部より後方に位置する前記
穴と前記導電管とのすき間に充填されることにより、こ
のセラミックセメントが前記発光管内部の放電空間に存
在しないように構成されたことを特徴とする高圧ナトリ
ウムランプ。1. A high-pressure sodium lamp in which a conductive tube having an electrode at its tip passes through a hole provided at the end of an arc tube made of alumina and is sealed with ceramic cement in the hole. At the sealing portion, the outer diameter of the arc tube is changed so that the rear end side is larger than the front end side, and the diameter of the hole of the arc tube is smaller than the outer diameter of the arc tube. The outer diameter changing portion of the conductive tube is in contact with the inner surface of the hole to form a contact portion, and the ceramic cement is located in the gap between the hole and the conductive tube located behind the contact portion. A high pressure sodium lamp characterized in that the ceramic cement is configured so as not to exist in the discharge space inside the arc tube by being filled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20868787A JPH083994B2 (en) | 1987-08-21 | 1987-08-21 | High pressure sodium lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20868787A JPH083994B2 (en) | 1987-08-21 | 1987-08-21 | High pressure sodium lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6452374A JPS6452374A (en) | 1989-02-28 |
| JPH083994B2 true JPH083994B2 (en) | 1996-01-17 |
Family
ID=16560408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20868787A Expired - Fee Related JPH083994B2 (en) | 1987-08-21 | 1987-08-21 | High pressure sodium lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH083994B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9207816U1 (en) * | 1992-06-10 | 1992-08-20 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De | |
| DE10026802A1 (en) * | 2000-05-31 | 2002-01-03 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Metal halide lamp with ceramic discharge vessel has capillary tube with two sections and diameter of inner section comes to, at most, 92% of diameter of outer section |
-
1987
- 1987-08-21 JP JP20868787A patent/JPH083994B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6452374A (en) | 1989-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |