JP2586682B2 - Single sealed metal vapor discharge lamp - Google Patents
Single sealed metal vapor discharge lampInfo
- Publication number
- JP2586682B2 JP2586682B2 JP2071636A JP7163690A JP2586682B2 JP 2586682 B2 JP2586682 B2 JP 2586682B2 JP 2071636 A JP2071636 A JP 2071636A JP 7163690 A JP7163690 A JP 7163690A JP 2586682 B2 JP2586682 B2 JP 2586682B2
- Authority
- JP
- Japan
- Prior art keywords
- arc tube
- sealed
- discharge lamp
- sealing portion
- vapor discharge
- 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】 ［発明の目的］ （産業上の利用分野） 本発明は小形メタルハライドランプ等の片封止形の小
形金属蒸気放電灯に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a small sealed metal vapor discharge lamp such as a small metal halide lamp.
（従来の技術） 近年、屋内、屋外照明等に使用される小形の金属蒸気
放電灯の開発が行われ、例えば特開昭59−54167号公報
などに示されるように、最近発光管の片側の端部のみに
一対の電極と接続する金属箔を封着した、いわゆる片封
止形の構造のものが開発されている。(Prior Art) In recent years, small metal vapor discharge lamps used for indoor and outdoor lighting have been developed. For example, as shown in Japanese Patent Application Laid-Open No. 59-54167, recently, one side of an arc tube has been developed. A so-called one-sided type structure in which a metal foil connected to a pair of electrodes is sealed only at an end portion has been developed.
この片封止形の放電灯は、従来の両側封止形の放電灯
に比べて、発光効率を高めるためにランプ負荷の高い状
態で点灯され、具体的には、ランプ入力電力／放電空間
の表面積で示される管壁負荷は20〜70（W/cm2）程度で
点灯されることが多い。This single-sealed discharge lamp is lit with a high lamp load in order to increase the luminous efficiency compared to the conventional double-sided sealed discharge lamp. Specifically, the lamp input power / the discharge space The tube wall load indicated by the surface area is often turned on at about 20 to 70 (W / cm 2 ).
また、この種の片封止形金属蒸気放電灯は、一対の電
極間で発生する陽光柱と圧潰封止部が近接し、さらに、
発光空間との境界部の封止面が、陽光柱と平行となって
いるため、その封止面の温度が、従来の両封止形電灯に
比べて非常に高温となり易いものである。Further, in this type of single-sealed metal vapor discharge lamp, a positive column generated between a pair of electrodes and a crushed sealing portion are close to each other, and further,
Since the sealing surface at the boundary with the light emitting space is parallel to the positive column, the temperature of the sealing surface tends to be extremely high as compared with the conventional double-sealed electric lamp.
（発明が解決しようとする課題） 上記構造の片封止形金属蒸気放電灯の場合、前述のよ
うに、陽光柱と圧潰封止部が近接し、さらに、発光空間
との境界部の封止面が、陽光柱と平行となっているた
め、その封止面の温度が、非常に高温となる傾向があ
る。(Problem to be Solved by the Invention) In the case of the single-seal type metal vapor discharge lamp having the above structure, as described above, the positive column and the crushed sealing portion are close to each other, and further, sealing of the boundary portion with the light emitting space is performed. Since the surface is parallel to the positive column, the temperature of the sealing surface tends to be very high.
また、通常発光効率を高めるためにランプ負荷の高い
状態で点灯されるため、その発光管の内部圧力が高くな
るものである。In addition, since the lamp is normally lit with a high lamp load in order to increase the luminous efficiency, the internal pressure of the arc tube increases.
また一方、この種の放電灯の場合、円筒状の石英管を
加熱溶融させ、ピンチャーによりその開口部を押圧して
封止しているため、発光空間と封止部との境界部で一対
の電極間を結ぶ方向に、溝状の凹部が形成されることに
なる。On the other hand, in the case of this type of discharge lamp, a cylindrical quartz tube is heated and melted, and its opening is pressed and sealed with a pincher. A groove-shaped recess is formed in the direction connecting the electrodes.
この凹部は、通常楔形状となっているため、発光管点
灯に伴い楔を拡げるような、換言すれば凹部を大きくす
るような応力が加わることになる。Since the concave portion is usually in the form of a wedge, a stress is applied to expand the wedge as the arc tube is turned on, in other words, to enlarge the concave portion.
さらに、この凹部に近接して封止されている金属箔の
周囲にも、金属箔と発光管材料である例えば石英との熱
膨脹率の違いに起因する歪みが発生している。Further, a distortion is also generated around the metal foil sealed near the concave portion due to a difference in thermal expansion coefficient between the metal foil and the arc tube material such as quartz.
これらに伴い、放電灯点灯中に封止部を中心とした破
損・破裂等を招く危惧があった。Accordingly, there is a fear that breakage or rupture of the sealing portion or the like may occur while the discharge lamp is lit.
したがって本発明は、発光管の封止部を中心とする破
損・破裂等を防止できる片封止形金属蒸気放電灯を提供
しようとするものである。Accordingly, an object of the present invention is to provide a single-sealed metal vapor discharge lamp that can prevent breakage, rupture, and the like of the arc tube at the center.
［発明の構成］ （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片封止形金属蒸気
放電灯は、始動用希ガスと発光金属および水銀が封入さ
れた放電空間と、この放電空間内に突出する一対の電極
に各々接続する一対の金属箔を封着する圧潰封止部が形
成されている発光管を備えたものであって、単位体積当
り水銀の封入量をＭ（mg/cc）、発光管の内壁面と金属
箔との最短距離をＬ（mm）としたとき、 L/M≧1.8×10-2（mm・cc/mg） としたことを特徴とする。[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, a single-sealed metal vapor discharge lamp according to the present invention includes a discharge space in which a starting rare gas, a luminescent metal, and mercury are sealed. An arc tube in which a crush sealing portion for sealing a pair of metal foils respectively connected to a pair of electrodes protruding into the discharge space is formed, and the amount of mercury enclosed per unit volume is reduced. M / mg / cc, and L / M ≧ 1.8 × 10 -2 (mm · cc / mg), where L (mm) is the shortest distance between the inner wall surface of the arc tube and the metal foil. I do.
（作用） 本発明においては、単位体積当り水銀の封止量をＭ
（mg/cc）、発光管の内壁面と金属箔との最短距離をＬ
（mm）としたとき、 L/M≧1.8×10-2（mm・cc/mg） としたため、発光管の封止部を中心とする破損・破裂等
を防止できる片封止形金属蒸気放電灯を提供できるもの
である。(Action) In the present invention, the sealed amount of mercury per unit volume is M
(Mg / cc), the shortest distance between the inner wall of the arc tube and the metal foil is L
(Mm), L / M ≧ 1.8 × 10 -2 (mm · cc / mg), so single-sided metal vapor discharge that can prevent breakage, rupture, etc. centering on the sealed part of the arc tube An electric lamp can be provided.
（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 example of the present invention will be described in detail with reference to the drawings.
第１図に本発明の実施例を示すように、石英ガラスで
形成され真空に維持された外管１内に収容された発光管
２は外管１と同様に石英ガラスで形成され、内容積が約
1.25ccである略楕円球形の放電空間３を有しており、そ
のバルブ短方向の一端に圧潰封止部４が設けられてい
る。As shown in an embodiment of the present invention in FIG. 1, an arc tube 2 formed of quartz glass and housed in an outer tube 1 maintained in a vacuum is formed of quartz glass similarly to the outer tube 1 and has an inner volume. Is about
The discharge space 3 has a substantially elliptical spherical shape of 1.25 cc, and a crush sealing portion 4 is provided at one end in the short direction of the bulb.
また、発光管２の圧潰封止部４の幅方向に離間して放
電空間３に突出する一対の電極５が配置されるように、
電極５の軸部６に接続する例えばモリブデン等からなる
金属箔７が圧潰封止部４に各々略平行に封着されてい
る。Also, a pair of electrodes 5 protruding into the discharge space 3 are arranged so as to be separated from each other in the width direction of the crushed sealing portion 4 of the arc tube 2.
A metal foil 7 made of, for example, molybdenum and connected to the shaft 6 of the electrode 5 is sealed substantially parallel to the crush sealing portion 4.
ここで、この金属箔の封着位置は、発光管の内壁面か
ら最短距離Ｌで3mm離間した位置に封着されているもの
で、より詳細には、第２図に示すように発光空間と封止
部との境界部で一対の電極間を結ぶ方向に、発光管の圧
潰封止の際に生ずる凹部（溝）８の底部と、金属箔の発
光空間側端部との最短距離Ｌが3mmとなっているもので
ある。Here, the sealing position of the metal foil is sealed at a position 3 mm away from the inner wall surface of the arc tube by the shortest distance L. More specifically, as shown in FIG. In the direction connecting the pair of electrodes at the boundary with the sealing portion, the shortest distance L between the bottom of the concave portion (groove) 8 generated when the arc tube is crushed and sealed and the end of the metal foil on the light emitting space side is determined. It is 3 mm.
また電極５の先端部には、その熱容量を大きくするた
めに例えば線径0.5mmのタングステンまたはトリウムを
２％程度含有したトリエーテッドタングステンからなる
コイル９が密に巻装されている。Further, a coil 9 made of, for example, tungsten having a wire diameter of 0.5 mm or thoriated tungsten containing about 2% of thorium is densely wound around the tip of the electrode 5 in order to increase its heat capacity.
電極軸部６は線径0.5mmのレニウムまたはレニウム−
タングステン合金からなり、その端部は前述のように圧
潰封着された例えばモリブデン等の金属箔６に夫々接続
されており、その金属箔６はそれぞれ外部導体10と接続
している。The electrode shaft 6 is made of rhenium or rhenium having a wire diameter of 0.5 mm.
The ends are connected to metal foils 6 made of, for example, molybdenum or the like, which are crushed and sealed as described above, and the metal foils 6 are connected to the external conductors 10, respectively.
また、放電空間３内には所定量の水銀と、ナトリウ
ム、タリウム、インジウムなどの金属ハロゲン化物、お
よび始動用希ガスが封入されており、本実施例の場合、
総量として50mg、単位体積当り（Ｍ）40mg/ccの水銀
と、金属ハロゲン化物としてSnI2、NaI、TlI、InI、NaB
r、LiBr等が封入され、安定点灯時のランプ電圧が95V、
ランプ電流が1.8Aでランプ入力電力が150Wとなるように
なっている。Further, a predetermined amount of mercury, a metal halide such as sodium, thallium, and indium, and a starting rare gas are sealed in the discharge space 3. In the case of this embodiment,
50 mg in total, 40 mg / cc (M) of mercury per unit volume, and SnI 2 , NaI, TlI, InI, NaB as metal halides
r, LiBr, etc. are enclosed, and the lamp voltage during stable lighting is 95V,
The lamp current is 1.8A and the lamp input power is 150W.
また、上記の構造の片封止形金属蒸気放電灯の他、金
属箔の封着位置について発光管の内壁面からの最短距離
Ｌ、及び水銀の封入量を種々変化させた片封止形金属蒸
気放電灯を多数製作して、3000時間点灯中の封止部破損
を調べたところ、表１に示す結果が得られた。In addition to the single-sealed metal vapor discharge lamp having the above-described structure, a single-sealed metal vapor discharge lamp in which the shortest distance L from the inner wall surface of the arc tube and the amount of mercury enclosed in the sealing position of the metal foil are variously changed. When a number of vapor discharge lamps were manufactured and the sealing portion was broken during lighting for 3000 hours, the results shown in Table 1 were obtained.
表１の結果から、上記実施例で説明した単位体積当り
の水銀封入量Ｍが40（mg/cc）、発光管内壁面と金属箔
との最短距離Ｌが３（mm）となっている片封止形金属蒸
気放電灯には、発光管の破損が生じておらず、また、L/
Mが0.018以上であれば、発光管の破損が一切生じないこ
とが判明した。 From the results in Table 1, one-sided sealing in which the amount of mercury enclosed per unit volume M described in the above example is 40 (mg / cc), and the shortest distance L between the inner wall surface of the arc tube and the metal foil is 3 (mm). In the stop-type metal vapor discharge lamp, the arc tube is not damaged, and L /
It was found that if M was 0.018 or more, no arc tube damage occurred.
この種の放電灯は前述の通り、陽光柱と封止部面とが
平行するような位置関係にあり、また、ランプ効率・演
色性等の特性を向上させるために管壁負荷を例えば20W/
cm2以上と高く設定しているため、凹部の発生、金属箔
の封止に起因して応力・歪みの影響を受ける封止部を中
心に破損が生じ易いものであるが、単位体積当りの水銀
封入量Ｍと、発光管内壁面と金属箔との最短距離Ｌとの
比率（L/M）を0.018以上とすることにより、この破損が
防止できる理由は次のように考えられる。As described above, this type of discharge lamp has a positional relationship such that the positive column and the sealing portion surface are parallel to each other.In addition, in order to improve characteristics such as lamp efficiency and color rendering, a tube wall load of, for example, 20 W /
Due to the high setting and cm 2 or more, the generation of the recess, but damage around the sealing portion affected by the stress and strain due to the sealing of the metal foil is of prone, per unit volume The reason why this breakage can be prevented by setting the ratio (L / M) of the amount of mercury enclosed M to the shortest distance L between the inner wall surface of the arc tube and the metal foil to 0.018 or more is considered as follows.
つまり、封止部が受ける応力は、発光管の内圧で関係
付けられるが、これは水銀の封入量、換言すれば水銀の
蒸気圧に大きく依存し、また一方、金属箔と石英との熱
膨張率の差に起因した歪みは、それらの温度差に関係付
けられるため、それらの距離に大きく依存する。In other words, the stress applied to the sealing portion is related to the internal pressure of the arc tube, which greatly depends on the amount of mercury enclosed, in other words, the vapor pressure of mercury, and on the other hand, the thermal expansion of the metal foil and quartz. The distortions due to the difference in rates are highly dependent on their distance, as they are related to their temperature difference.
さらに、発光空間と封止部との境界部に生ずる封止部
の凹部に微小クラックが生じて、これが封止端部方向に
広がり、金属箔が封止されている位置にまで到達した場
合に発光管破損が発生するものと思われるため、発光管
破損は金属箔までの距離にもまた影響されることにな
る。Furthermore, when a minute crack occurs in the concave portion of the sealing portion generated at the boundary portion between the light emitting space and the sealing portion, this spreads in the direction of the sealing end portion, and reaches the position where the metal foil is sealed. Since it is assumed that arc tube damage will occur, arc tube damage will also be affected by the distance to the metal foil.
したがって、これらの条件が相互に作用して発光管破
損の発生が誘発されるものであり、この支障の発生の有
無について、単位体積当りの水銀封入量と、発光管内壁
面と金属箔との最短距離との間には臨界条件が上記のよ
うに存在するものと推察される。Therefore, these conditions interact to cause damage to the arc tube, and the occurrence of this obstacle is determined by the amount of mercury enclosed per unit volume and the shortest distance between the inner wall of the arc tube and the metal foil. It is presumed that the critical condition exists between the distance and the distance as described above.
尚、本発明者らの実験によれば、単位体積当りの水銀
封入量Ｍと、発光管内壁面と金属箔との最短距離Ｌとの
比率（L/M）を0.62以下に設定することがより好ましい
ことを確認している。According to the experiments of the present inventors, the ratio (L / M) of the amount of enclosed mercury M per unit volume and the shortest distance L between the inner wall surface of the arc tube and the metal foil is set to 0.62 or less. We confirm that it is favorable.
これは、単位体積当りの水銀封入量Ｍと、発光管内壁
面と金属箔との最短距離Ｌとの比率を大きくした場合
に、相対的に封止部内に埋設される電極軸の長さが長く
なるが、この埋設長が大きくなりすぎると、この電極軸
と石英とのわずかな空隙に入込む封入物の量が増加し
て、効率・演色性の低下を来す虞れあり、一方、相対的
に水銀の封入量が少なくなり過ぎると、発光空間内の対
流が生じ難くなり発光の不均一を誘発する危惧があるた
めである。This is because, when the ratio between the amount of enclosed mercury M per unit volume and the shortest distance L between the inner wall surface of the arc tube and the metal foil is increased, the length of the electrode shaft buried in the sealing portion is relatively long. However, if the buried length is too large, the amount of the filling material that enters into the slight gap between the electrode shaft and the quartz increases, and there is a possibility that the efficiency and the color rendering property may decrease. If the amount of the enclosed mercury is excessively small, convection in the light emitting space becomes difficult to occur, and there is a fear that the light emission may be uneven.
また、第３図に図示するように、例えば封止部に封着
する金属箔の形状を発光空間の形状に沿うように形成し
て、発光管内壁面と金属箔との最短距離を大きくしたも
のは、封止部全体を大きくする必要がないため、この封
止部からの放熱が増加することがないため、発光管最冷
部の温度低下がなく好ましい。In addition, as shown in FIG. 3, for example, the shape of the metal foil sealed to the sealing portion is formed so as to conform to the shape of the light emitting space, and the shortest distance between the inner wall surface of the arc tube and the metal foil is increased. Since it is not necessary to increase the size of the entire sealing portion, the heat radiation from this sealing portion does not increase, and the temperature of the coolest portion of the arc tube does not decrease, which is preferable.
［発明の効果］ 以上説明した本発明によれば、始動用希ガスと発光金
属および水銀が封入された放電空間と、この放電空間内
に突出する一対の電極に各々接続する一対の金属箔を封
着する圧潰封止部が形成されている発光管を備えたもの
であって、単位体積当り水銀の封入量をＭ（mg/cc）、
発光管の内壁面と金属箔との最短距離をＬ（mm）とした
とき、 L/M≧1.8×10-2（mm・cc/mg） としたため、発光管の封止部を中心とする破損・破裂等
を防止できる片封止形金属蒸気放電灯を提供できる。[Effects of the Invention] According to the present invention described above, a discharge space in which a starting rare gas, a luminescent metal, and mercury are sealed, and a pair of metal foils respectively connected to a pair of electrodes protruding into the discharge space. A luminous tube provided with a crush sealing portion for sealing, wherein the amount of mercury enclosed per unit volume is M (mg / cc),
When the shortest distance between the inner wall surface of the arc tube and the metal foil is L (mm), L / M ≧ 1.8 × 10 -2 (mm · cc / mg). A single-ended metal vapor discharge lamp capable of preventing breakage and rupture can be provided.
第１図は本発明の一実施例に係る片封止形金属蒸気放電
灯の概略図、第２図及び第３図は本発明の一実施例に係
る発光管の概略図である。 １……外管、２……発光管 ３……放電空間、４……圧潰封止部 ５……電極、７……金属箔FIG. 1 is a schematic diagram of a single-sealed metal vapor discharge lamp according to one embodiment of the present invention, and FIGS. 2 and 3 are schematic diagrams of an arc tube according to one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Outer tube, 2 ... Arc tube 3 ... Discharge space, 4 ... Crush sealing part 5 ... Electrode, 7 ... Metal foil
Claims (1)
入された放電空間および圧潰封止部を有した発光管と； 放電空間内に突出する一対の電極と； 一対の電極に各々接続され、単位体積当り水銀の封入量
をＭ（mg/cc）、発光管の内壁面との最短距離をＬ（m
m）としたとき、 L/M≧1.8×10-2（mm・cc/mg） の関係で圧潰封止部に封止される一対の金属箔と； 発光管を内部に配設した外管と； を具備していることを特徴とする片封止形金属蒸気放電
灯。An arc tube having a discharge space filled with a starting rare gas, a luminous metal and mercury and a crushed sealing portion; a pair of electrodes protruding into the discharge space; and each connected to a pair of electrodes. The amount of enclosed mercury per unit volume is M (mg / cc), and the shortest distance from the inner wall of the arc tube is L (m
m), a pair of metal foils sealed in the crushable sealing portion in a relationship of L / M ≧ 1.8 × 10 -2 (mm · cc / mg); an outer tube having an arc tube disposed inside And a half-sealed type metal vapor discharge lamp, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2071636A JP2586682B2 (en) | 1990-03-20 | 1990-03-20 | Single sealed metal vapor discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2071636A JP2586682B2 (en) | 1990-03-20 | 1990-03-20 | Single sealed metal vapor discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03272560A JPH03272560A (en) | 1991-12-04 |
| JP2586682B2 true JP2586682B2 (en) | 1997-03-05 |
Family
ID=13466335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2071636A Expired - Fee Related JP2586682B2 (en) | 1990-03-20 | 1990-03-20 | Single sealed metal vapor discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2586682B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2427904B1 (en) * | 2009-05-07 | 2013-02-20 | Koninklijke Philips Electronics N.V. | Mercury-free high-intensity gas-discharge lamp |
-
1990
- 1990-03-20 JP JP2071636A patent/JP2586682B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03272560A (en) | 1991-12-04 |
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