JPS624821B2 - - Google Patents
Info
- Publication number
- JPS624821B2 JPS624821B2 JP3655079A JP3655079A JPS624821B2 JP S624821 B2 JPS624821 B2 JP S624821B2 JP 3655079 A JP3655079 A JP 3655079A JP 3655079 A JP3655079 A JP 3655079A JP S624821 B2 JPS624821 B2 JP S624821B2
- Authority
- JP
- Japan
- Prior art keywords
- thermally responsive
- responsive element
- discharge
- heating
- bimetal
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 229910001507 metal halide Inorganic materials 0.000 description 12
- 150000005309 metal halides Chemical class 0.000 description 12
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 10
- 229910052753 mercury Inorganic materials 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 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 2
- 230000000694 effects Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- JXBFBSYDINUVRE-UHFFFAOYSA-N [Ne].[Ar] Chemical compound [Ne].[Ar] JXBFBSYDINUVRE-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- SLSBUGNNRDXZJZ-UHFFFAOYSA-N krypton neon Chemical compound [Ne].[Kr] SLSBUGNNRDXZJZ-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Description
この発明は希ガスおよび水銀を封入した高圧水
銀ランプ、希ガスおよび水銀とともに金属ナトリ
ウムを封入した高圧ナトリウムランプ、希ガスお
よび水銀とともに金属ハロゲン化物を封入したメ
タルハライドランプなどの高圧金属蒸気放電灯に
関するもので、特にバイメタルなどの熱応動素子
の動作によつて放電を開始せしめる高圧金属蒸気
放電灯において、この熱応動素子の接点溶着時の
安定器焼損を防止するためのものである。
以下、この発明の要旨とするところをメタルハ
ライドランプの場合について説明する。
メタルハライドランプは、希ガスおよび水銀と
ともに金属ハロゲン化物を封入することによつ
て、通常の高圧水銀ランプの効率と演色性を著し
く改造したものである。
そして、一般の高圧水銀ランプ用安定器で点灯
可能なメタルハライドランプは第１図に示すよう
な構成からなつている。即ち硬質ガラスなどから
なる透光性外管１内に、石英などからなる透光性
発光管２が収められており、この発光管２の内部
には始動用のネオン−アルゴンまたはネオン−ク
リプトンなどのペニングガスが、所定量の水銀お
よび金属ハロゲン化物とともに封入されている。
３ａ，３ｂは上記発光管２の両端部に対向して設
置された主電極で、モリブデンなどからなる金属
箔４ａ，４ｂを介して導入リード５ａ，５ｂに接
続されている。一方の導入リード５ａは熱応動素
子としてのバイメタル６を動作させるための加熱
体であるフイラメント７を介してステムリード８
ａに接続され、他方の導入リード５ｂはタングス
テンなどからなる電流供給線９を介してステムリ
ード８ｂに接続されている。
さらに、一方の主電極３ａに対向して補助電極
１０が設置されていて、金属箔１１を介して導入
リード１２に接続されている。
この導入リード１２は、上記バイメタル６を支
持するためのガラスビーズ１３に設けられた固定
接点１４に接続され、さらに上記バイメタル６の
一端に設けられた可動接点１５、上記バイメタル
６および固定端子１６を介して上記ステムリード
８ｂに接続されている。なお、上記発光管２の端
部には、この発光管２内に封入された金属ハロゲ
ン化物の動作時における蒸気圧を高めるための保
温体１７が設けられている。
そして、上記外管１内にはZr−Ar系のゲツタ
ー１８が設置されているとともに、上記発光管２
内からNeガスの流出を防ぐために、所定圧力の
Ne−N2混合ガスが封入されている。また１９は
ステム、２０は口金である。
このような構成からなるメタルハライドランプ
を、高圧水銀ランプ用安定器を介して電源を印加
し点灯すると、まず主電極３ａと補助電極１０と
の間に補助放電が起こり、補助放電が所定時間継
続した後、この放電そのものおよびフイラメント
７からの放熱によりバイメタル６が動作して、固
定接点１４と可動接点１５間の接続が開放され
る。この時、発光管２内には上記補助放電により
電離されたガスが生成されているとともに、主電
極３ａ，３ｂ間にサージ電圧が印加されて主放電
に移行する。
しかしながら、バイメタル６の開放時に固定接
点１４と可動接点１５の間、あるいは固定接点１
４とバイメタル６との間に放電が起こる現象が観
察された。とくにランプの寿命末期において上記
バイメタル６が開放しても、主電極３ａ，３ｂ間
の主放電が安定しない場合、前述の両接点１４，
１５間の放電が繰り返され、ついには両接点１
４，１５が溶着して主電極間の正規の放電に移行
せず、主電極３ａ、補助電極１０間に安定器の短
絡電流にほぼ等しい大電流が流れつづけ、安定器
が焼損する欠点があつた。
このような欠点を改善するために、回路の一部
にヒユーズを挿入する方法があるが、この種の放
電灯では主電極３ａ−補助電極１０間あるいは両
主電極３ａ，３ｂ間の放電開始直後に、電極の電
子放射能のアンバランスにより整流現象が発生
し、安定器の短絡電流の２倍以上の放電電流が流
れるため、この過電流によりヒユーズが溶断し、
放電灯の短寿命をもたらす恐れがあり、第１のバ
イメタル６ａが溶着した時にのみ回路をしや断さ
せる効果は得られないものであつた。
この発明はこのような従来の欠点に鑑みてなさ
れたものであり、上記の熱応動素子の動作を確実
に行わしめ、この発明の目的を支障なく達成せし
めるために、外管内に少なくとも一対の主電極を
有する発光管、この発光管の一方の主電極に近接
して配設された補助電極に接続された傍熱形熱応
動素子および、上記一方の主電極に接続されこの
熱応動素子を加熱する加熱体を具備し、上記熱応
動素子の動作によつて放電を開始せしめる鉛直点
灯用金属蒸気放電灯において、上記加熱体は容易
に溶断可能な構成とし、上記熱応動素子は少なく
とも一つの熱応動素子からなる第１の熱応動素子
とこの第１の熱応動素子よりも遅れて動作し、上
記補助極側に接続される少なくとも一つの熱応動
素子からなる第２の熱応動素子とを直列に接続し
てなり、かつ上記第１の熱応動素子と上記第２の
熱応動素子との接続部と上記加熱体との最短距離
を、上記第１の熱応動素子と上記加熱体との最短
距離よりも短くするとともに、第２の熱応動素子
の熱応動部を第１の熱応動素子の熱応動部より、
加熱体から遠くにかつ鉛直方向で下側に配置する
ことによつて、前述の如き安定器の焼損を確実に
防止することを可能にしたものである。
以下、この発明の詳細を図面に基づいて説明す
る。
第２図はこの発明を実施してなる金属蒸気放電
灯の回路構成を示した図で、発光管２の両端には
一対の主電極３ａ，３ｂが封着され、少なくとも
一方の主電極３ａに対向して補助電極１０が設置
されている。主電極３ａは熱応動素子加熱用フイ
ラメント７を介して安定器２２の二次側端子２３
に接続され、補助電極１０は第２の熱応動素子６
ｂおよび第１の熱応動素子６ａを介して安定器２
２の二次側端子２４に接続され、また主電極３ｂ
は熱応動素子６ｂ，６ａを介さずに安定器２２の
二次側端子２４に接続されている。
そして、第２の熱応動素子６ｂは第１の熱応動
素子６ａよりも遅れて動作するように設定されて
いる。このような回路構成を形成して安定器２２
を介して電源が印加されると、まず主電極３ａと
補助電極１０との間に補助放電が開始され、所定
時間を経過し後に第１の熱応動素子６ａが動作し
て、安定器２２の二次側端子２３−加熱用フイラ
メント７−主電極３ａ−補助電極１０−第２の熱
応動素子６ｂなる回路と第１の熱応動素子６ａ−
安定器２２の二次側端子２４なる回路との間の接
続状態が開放され、両主電極３ａ，３ｂ間の主放
電が開始される。この主放電開始後所定の時間を
経て第２の熱応動素子６ｂが動作して、第２の熱
応動素子６ｂと補助電極１０との間の接続状態が
開放されるが、すでに第１の熱応動素子６ａの動
作によつて、第２の熱応動素子６ｂ−補助電極１
０部分は回路がしや断されているので、上記第２
の熱応動素子６ｂの動作によつて外管内の回路を
構成しているいずれの部位においても断線は起こ
らない。しかしながら、第１の熱応動素子６ａが
溶着した状態で、安定器２２を介して電源が印加
されると、所定時間を経過しても第１の熱応動素
子６ａの動作によつて第１の熱応動素子６ａと第
２の熱応動素子６ｂ間の接続が開放されることが
ないために、第２の熱応動素子６ｂの動作時に第
１の熱応動素子６ａと第２の熱応動素子６ｂとの
接続部位Ａの一部と、加熱用フイラメント７の一
部との間に放電を起こし、この放電によつて上記
加熱用フイラメント７を断線状態に至らしめ、電
流が継続して流れるのを防止し安定器２２の焼損
を防止することが可能となる。なお、断線部分は
放電部位でも、放電部位周辺のどちらでもよい。
次に、この発明を実施してなる金属蒸気放電灯
の実施例について説明する。
第３図はこの発明を実施してなるメタルハライ
ドランプの構成を示しており、補助電極１０に金
属箔１１を介して接続された導入リード１２はガ
ラスビーズ１３に設けられた固定接続棒１４に溶
接されていて、この固定接続棒１４には第２の熱
応動素子であるバイメタル６ｂの一端に設けられ
た可動接点１５が接触して配設され、このバイメ
タル６ｂの他端は、ガラスビーズ１３のもう一つ
の固定接点棒１６に溶接されている。固定接点棒
１６は接続リード２１を介して、第１の熱応動素
子であるバイメタル６ａの一端に設けられた可動
接点１５′に直列に接続され、ステムリード８ｂ
に達している。そして、上記接続リード２１と加
熱体であるフイラメント７との最短距離は十分短
い間隔でかつ第１の熱応動素子であるバイメタル
６ａの可動接点１５′とフイラメント７との最短
距離よりも短く配置されているとともに、第２の
熱応動素子であるバイメタル６ｂは第１の熱応動
素子であるバイメタル６ａよりも、鉛直位置関係
で下側に配置されているために、対流冷却の効果
により、上側に配置され、フイラメントからの熱
を対流によつても受け易く、加熱され易いバイメ
タル６ａの動作よりも、確実に遅れて、バイメタ
ル６ａの動作よりも長い時間を経て、固定接続棒
１４から可動接点１５が開放されるように設定し
ている。なお、上記以外の部分の構成は第１図に
示す従来のメタルハライドランプの構成と同じで
ある。
このように構成されたメタルハライドランプに
おいては、通常の状態で高圧水銀ランプ用安定器
を介して電源が印加し点灯すると、まず主電極３
ａと補助電極１０との間に補助放電が起こり、補
助放電が所定時間継続した後、第１の熱応動素子
であるバイメタル６ａが動作して、接続リード２
１と可動接点１５′間の接続が開放され、両主電
極３ａ，３ｂ間の主放電に移行する。この時、第
２の熱応動素子であるバイメタル６ｂの可動接点
１５と固定接続棒１４との接触は上記主放電への
移行後に開放される。そして、第１の熱応動素子
であるバイメタル６ａの可動接点１５′と接続リ
ード２１が溶着した時には、第２の熱応動素子で
あるバイメタル６ｂが動作して、可動接点１５と
固定接続棒１４との接触が開放されると、その瞬
間放電灯の放電電流はしや断され、安定器（図示
せず）の両端子間にサージ電圧が発生し、このサ
ージ電圧は、ステムリード８ａ−支持枠２５−固
定棒２２−フイラメント７−導入リード５ａ−主
電極３ａなる回路を構成する部位と、
ステムリード８ｂ
支持棒２６ バイメタル６ａ−可動接点１５′−
接続リード２１−バイメタル６ｂ−
可動接点１５
電流供給線９−導入リード５ｂ−主
電極３ｂ
なる回路を構成する部位との間に印加される。第
１の熱応動素子であるバイメタル６ｂが溶着する
場合、両主電極３ａ，３ｂ間の放電開始電圧は高
くなつているので、この両主電極間の放電開始電
圧より低くなるようにフイラメント７と接続リー
ド２１との距離を十分短くすることにより、上記
サージ電圧によりフイラメント７と接続リード２
１との間で放電が開始し、フイラメント７が溶断
するので、電流が停止して安定器の焼損が防止で
きる。なお、上記フイラメント７と接続リード２
１との最短距離は第１のバイメタル６ａとフイラ
メント７との最短距離より短くしてあるので、第
１のバイメタル６ａが正常に動作する時のサージ
電圧によりフイラメントが溶断することを防止し
ながら、安定器焼損を確実に防止できる。
第３図に示したような構成の金属蒸気放電灯に
おいては、第１の熱応動素子６ａは少なくとも第
２の熱応動素子６ｂを介して補助電極１０に接続
されていなければならない。なお、上記２種類の
熱応動素子は、上述の説明のように各々１個ずつ
でもよいが、各々２個以上にすることによつてよ
り高い信頼性が得られる。特に、第１の熱応動素
子６ａは複数個の熱応動素子からなるように構成
することによつて上記金属蒸気放電灯の長寿命を
維持することが可能になる。
特に、複数の第１の熱応動素子の動作時間をわ
ずかずつずらして設定することによつて、寿命中
の熱応動素子のぜい化、あるいは発光管の始動電
圧上昇などにより、主電極３ａ，３ｂ間の放電に
移行し難い状態で複数の第１の熱応動素子のうち
のいずれかで接点間の放電がくり返される場合で
も、複数の第１の熱応動素子のうちの他の熱応動
素子の動作によつてより確実に上記主放電への移
行を可能に行なうことができる。
この発明は以上述べたように、外管内に少なく
とも一対の主電極を有する発光管、この発光管の
一方の主電極に近接して配設された補助電極に接
続された傍熱形熱応動素子および、上記一方の主
電極に接続されこの熱応動素子を加熱する加熱体
を具備し、上記熱応動素子の動作によつて放電を
開始せしめる鉛直点灯用金属蒸気放電灯におい
て、上記加熱体は容易に溶断可能な構成とし、上
記熱応動素子は少なくとも一つの熱応動素子から
なる第１の熱応動素子とこの第１の熱応動素子よ
りも遅れて動作し、上記補助電極側に接続される
少なくとも一つの熱応動素子からなる第２の熱応
動素子とを直列に接続してなり、かつ上記第１の
熱応動素子と上記第２の熱応動素子との接続部と
上記加熱体との最短距離を、上記第１の熱応動素
子と上記加熱体との最短距離よりも短くするとと
もに、第２の熱応動素子の熱応動部を第１の熱応
動素子の熱応動部より、加熱体から遠くにかつ鉛
直方向で下側に配置したことによつて熱応動素子
の動作を確実に行わしめ、通常の場合は、誤りな
く確実に放電灯を点灯せしめるとともに、万一熱
応動素子の溶着による安定器焼損を未然に防止す
ることができる。
This invention relates to high-pressure metal vapor discharge lamps such as high-pressure mercury lamps filled with rare gas and mercury, high-pressure sodium lamps filled with metal sodium together with rare gas and mercury, and metal halide lamps filled with metal halides along with rare gas and mercury. In particular, in a high-pressure metal vapor discharge lamp in which discharge is started by the operation of a thermally responsive element such as a bimetal, this is intended to prevent burnout of the ballast when the contacts of the thermally responsive element are welded. Hereinafter, the gist of the present invention will be explained in the case of a metal halide lamp. Metal halide lamps significantly modify the efficiency and color rendering properties of conventional high pressure mercury lamps by encapsulating metal halides along with rare gases and mercury. A metal halide lamp that can be lit with a general high-pressure mercury lamp ballast has a structure as shown in FIG. That is, a light-transmitting light emitting tube 2 made of quartz or the like is housed within a light-transmitting outer tube 1 made of hard glass or the like, and a light-transmitting light such as neon-argon or neon-krypton for starting is contained inside the light-transmitting light tube 2. Penning gas is enclosed together with a predetermined amount of mercury and metal halide.
Reference numerals 3a and 3b are main electrodes placed opposite to each other at both ends of the arc tube 2, and are connected to lead-in leads 5a and 5b via metal foils 4a and 4b made of molybdenum or the like. One introduction lead 5a is connected to a stem lead 8 via a filament 7 which is a heating body for operating a bimetal 6 as a thermally responsive element.
The other introduction lead 5b is connected to the stem lead 8b via a current supply line 9 made of tungsten or the like. Furthermore, an auxiliary electrode 10 is installed opposite to one of the main electrodes 3a, and is connected to an introduction lead 12 via a metal foil 11. This introduction lead 12 is connected to a fixed contact 14 provided on a glass bead 13 for supporting the bimetal 6, and further connected to a movable contact 15 provided at one end of the bimetal 6, the bimetal 6, and a fixed terminal 16. It is connected to the stem lead 8b via the stem lead 8b. A heat insulator 17 is provided at the end of the arc tube 2 to increase the vapor pressure of the metal halide sealed within the arc tube 2 during operation. A Zr-Ar getter 18 is installed inside the outer tube 1, and the arc tube 2
To prevent Ne gas from flowing out from within the
Ne- N2 mixed gas is sealed. Further, 19 is a stem, and 20 is a base. When a metal halide lamp having such a configuration is turned on by applying power through a high-pressure mercury lamp ballast, an auxiliary discharge first occurs between the main electrode 3a and the auxiliary electrode 10, and the auxiliary discharge continues for a predetermined time. Thereafter, the bimetal 6 operates due to this discharge itself and heat radiation from the filament 7, and the connection between the fixed contact 14 and the movable contact 15 is released. At this time, ionized gas is generated in the arc tube 2 by the auxiliary discharge, and a surge voltage is applied between the main electrodes 3a and 3b, causing a transition to a main discharge. However, when the bimetal 6 is opened, between the fixed contact 14 and the movable contact 15 or between the fixed contact 1
A phenomenon in which electric discharge occurred between 4 and bimetal 6 was observed. In particular, when the main discharge between the main electrodes 3a and 3b is not stabilized even if the bimetal 6 is opened at the end of the life of the lamp, both contacts 14,
The discharge for 15 minutes was repeated, and finally both contacts 1
4 and 15 are welded and the discharge does not proceed to normal between the main electrodes, and a large current approximately equal to the short circuit current of the ballast continues to flow between the main electrode 3a and the auxiliary electrode 10, resulting in burnout of the ballast. Ta. In order to improve such defects, there is a method of inserting a fuse in a part of the circuit, but in this type of discharge lamp, immediately after the discharge starts between the main electrode 3a and the auxiliary electrode 10 or between the two main electrodes 3a and 3b. In this case, a rectification phenomenon occurs due to the unbalance of the electron radiation of the electrodes, and a discharge current that is more than twice the short-circuit current of the ballast flows, and this overcurrent causes the fuse to melt.
This may shorten the life of the discharge lamp, and the effect of breaking the circuit only when the first bimetal 6a is welded cannot be obtained. The present invention has been made in view of such conventional drawbacks, and in order to ensure the operation of the above-mentioned thermally responsive element and achieve the object of the present invention without any problems, at least one pair of main bodies are provided within the outer tube. an arc tube having an electrode; an indirectly heated thermally responsive element connected to an auxiliary electrode disposed close to one main electrode of the arc tube; and an indirectly heated thermally responsive element connected to the one main electrode that heats the thermally responsive element. In the vertically lit metal vapor discharge lamp, the heating element is configured to be easily meltable, and the heating element is configured to be easily fused, and the thermally responsive element is configured to be easily fused. A first thermally responsive element consisting of a responsive element and a second thermally responsive element consisting of at least one thermally responsive element that operates later than the first thermally responsive element and connected to the auxiliary pole side are connected in series. and the shortest distance between the connecting portion of the first thermally responsive element and the second thermally responsive element and the heating body is the shortest distance between the first thermally responsive element and the heating body. In addition, the thermally responsive part of the second thermally responsive element is made shorter than the thermally responsive part of the first thermally responsive element.
By arranging the ballast far from the heating element and vertically downward, it is possible to reliably prevent the ballast from burning out as described above. The details of this invention will be explained below based on the drawings. FIG. 2 is a diagram showing the circuit configuration of a metal vapor discharge lamp according to the present invention, in which a pair of main electrodes 3a and 3b are sealed at both ends of the arc tube 2, and at least one of the main electrodes 3a is sealed. Auxiliary electrodes 10 are placed opposite to each other. The main electrode 3a is connected to the secondary terminal 23 of the ballast 22 via the filament 7 for heating the thermally responsive element.
The auxiliary electrode 10 is connected to the second thermally responsive element 6
b and the ballast 2 via the first thermally responsive element 6a.
2, and is also connected to the main electrode 3b.
is connected to the secondary side terminal 24 of the ballast 22 without going through the thermally responsive elements 6b, 6a. The second thermally responsive element 6b is set to operate later than the first thermally responsive element 6a. The ballast 22 is formed with such a circuit configuration.
When power is applied through the auxiliary electrode 10, an auxiliary discharge is first started between the main electrode 3a and the auxiliary electrode 10, and after a predetermined time has elapsed, the first thermally responsive element 6a is activated and the ballast 22 is activated. Secondary side terminal 23 - heating filament 7 - main electrode 3a - auxiliary electrode 10 - circuit consisting of second thermally responsive element 6b and first thermally responsive element 6a -
The connection state between the secondary side terminal 24 of the ballast 22 and the circuit is opened, and the main discharge between the two main electrodes 3a and 3b is started. The second thermally responsive element 6b operates after a predetermined period of time after the start of the main discharge, and the connection state between the second thermally responsive element 6b and the auxiliary electrode 10 is released, but the first thermally By the operation of the responsive element 6a, the second thermally responsive element 6b-auxiliary electrode 1
The circuit is broken in the 0 part, so the second part above
Due to the operation of the thermally responsive element 6b, no wire breakage occurs in any part of the circuit inside the outer tube. However, if power is applied via the ballast 22 with the first thermally responsive element 6a welded, the operation of the first thermally responsive element 6a will cause the first Since the connection between the thermally responsive element 6a and the second thermally responsive element 6b is not released, the first thermally responsive element 6a and the second thermally responsive element 6b are connected when the second thermally responsive element 6b is operated. A discharge is generated between a part of the connection part A and a part of the heating filament 7, and this discharge brings the heating filament 7 into a disconnection state, preventing the current from continuing to flow. This makes it possible to prevent the ballast 22 from burning out. Note that the disconnected portion may be either at the discharge site or around the discharge site. Next, an example of a metal vapor discharge lamp according to the present invention will be described. FIG. 3 shows the configuration of a metal halide lamp according to the present invention, in which an introduction lead 12 connected to an auxiliary electrode 10 via a metal foil 11 is welded to a fixed connecting rod 14 provided on a glass bead 13. A movable contact 15 provided at one end of a bimetal 6b, which is a second thermally responsive element, is disposed in contact with the fixed connection rod 14, and the other end of the bimetal 6b is connected to the glass bead 13. It is welded to another fixed contact rod 16. The fixed contact rod 16 is connected in series via a connection lead 21 to a movable contact 15' provided at one end of the bimetal 6a, which is the first thermally responsive element, and connected to a stem lead 8b.
has reached. The shortest distance between the connection lead 21 and the filament 7, which is a heating element, is arranged at a sufficiently short interval and shorter than the shortest distance between the movable contact 15' of the bimetal 6a, which is the first thermally responsive element, and the filament 7. At the same time, since the bimetal 6b, which is the second thermally responsive element, is located vertically lower than the bimetallic 6a, which is the first thermally responsive element, due to the effect of convection cooling, the bimetal 6b is placed on the upper side. The movable contact 15 is moved from the fixed connecting rod 14 to the movable contact 15 after a longer period of time than the operation of the bimetal 6a, which is arranged and which easily receives heat from the filament by convection and is easily heated. is set to be open. Note that the structure of the parts other than the above is the same as the structure of the conventional metal halide lamp shown in FIG. In a metal halide lamp configured in this way, when power is applied through the high-pressure mercury lamp ballast and the lamp is turned on under normal conditions, first the main electrode 3
An auxiliary discharge occurs between the auxiliary electrode 10 and the auxiliary electrode 10, and after the auxiliary discharge continues for a predetermined time, the bimetal 6a, which is the first thermally responsive element, operates and the connection lead 2
The connection between the contact point 1 and the movable contact 15' is opened, and the main discharge occurs between the two main electrodes 3a and 3b. At this time, the contact between the movable contact 15 of the bimetal 6b, which is the second thermally responsive element, and the fixed connecting rod 14 is released after the transition to the main discharge. When the movable contact 15' of the bimetal 6a, which is the first thermally responsive element, and the connecting lead 21 are welded together, the bimetallic 6b, which is the second thermally responsive element, operates to connect the movable contact 15 and the fixed connecting rod 14. When the contact of 25-Fixed rod 22-Filament 7-Introduction lead 5a-Main electrode 3a, which constitutes the circuit, Stem lead 8b Support rod 26 Bimetal 6a-Movable contact 15'-
Connection lead 21-bimetal 6b-
The movable contact 15 is applied between the current supply line 9, the lead-in lead 5b, and the main electrode 3b, which constitute the circuit. When the bimetal 6b, which is the first thermally responsive element, is welded, the discharge starting voltage between the two main electrodes 3a and 3b is high, so the filament 7 should be By making the distance to the connection lead 21 sufficiently short, the surge voltage can cause the filament 7 and the connection lead 2 to
1, and the filament 7 is fused, so the current stops and the ballast can be prevented from burning out. Note that the filament 7 and the connecting lead 2
Since the shortest distance between the first bimetal 6a and the filament 7 is shorter than the shortest distance between the first bimetal 6a and the filament 7, the filament can be prevented from melting due to surge voltage when the first bimetal 6a is operating normally. Stabilizer burnout can be reliably prevented. In the metal vapor discharge lamp having the configuration shown in FIG. 3, the first thermally responsive element 6a must be connected to the auxiliary electrode 10 via at least the second thermally responsive element 6b. Note that the two types of thermally responsive elements described above may each have one piece as described above, but higher reliability can be obtained by using two or more of each type. In particular, by configuring the first thermally responsive element 6a to include a plurality of thermally responsive elements, it becomes possible to maintain a long life of the metal vapor discharge lamp. In particular, by setting the operation times of the plurality of first thermally responsive elements to be slightly different from each other, the main electrode 3a, Even if the discharge between the contacts is repeated in any one of the plurality of first thermally responsive elements in a state in which it is difficult to transition to the discharge between 3b and 3b, the other thermally responsive among the plurality of first thermally responsive elements The operation of the element allows the transition to the main discharge to be performed more reliably. As described above, the present invention provides an arc tube having at least one pair of main electrodes inside the outer bulb, and an indirectly heated thermally responsive element connected to an auxiliary electrode disposed close to one of the main electrodes of the arc tube. and a metal vapor discharge lamp for vertical lighting, which is equipped with a heating element that is connected to one of the main electrodes and heats the thermally responsive element, and which starts discharge by the operation of the thermally responsive element; The thermally responsive element has a first thermally responsive element consisting of at least one thermally responsive element, and at least one thermally responsive element that operates later than the first thermally responsive element and is connected to the auxiliary electrode side. A second thermally responsive element consisting of one thermally responsive element is connected in series, and the shortest distance between the connection part of the first thermally responsive element and the second thermally responsive element and the heating body. is shorter than the shortest distance between the first thermally responsive element and the heating body, and the thermally responsive part of the second thermally responsive element is located farther from the heating body than the thermally responsive part of the first thermally responsive element. By arranging the thermally responsive element vertically downward, the operation of the thermally responsive element is ensured. Under normal circumstances, the discharge lamp can be lit without error, and in the unlikely event that the thermally responsive element is welded, it can be stabilized. It is possible to prevent equipment burnout.
第１図は従来の金属蒸気放電灯の一例を示す外
観構成図、第２図はこの発明を実施してなる金属
蒸気放電灯の回路構成図、第３図はこの発明によ
る金属蒸気放電灯の一例を示す外観構成図であ
る。
１は外管、２は発光管、３ａ，３ｂは主電極、
６ａ，６ｂは第１および第２の熱応動素子、７は
フイラメント（加熱体）、１０は補助電極。図
中、同一符号は同一または相当部分を示す。
FIG. 1 is an external configuration diagram showing an example of a conventional metal vapor discharge lamp, FIG. 2 is a circuit configuration diagram of a metal vapor discharge lamp according to the present invention, and FIG. 3 is a circuit diagram of a metal vapor discharge lamp according to the present invention. FIG. 2 is an external configuration diagram showing an example. 1 is an outer tube, 2 is an arc tube, 3a and 3b are main electrodes,
6a and 6b are first and second thermally responsive elements, 7 is a filament (heating body), and 10 is an auxiliary electrode. In the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
光管、この発光管の一方の主電極に近接して配設
された補助電極に接続された傍熱形熱応動素子お
よび、上記一方の主電極に接続されこの熱応動素
子を加熱する加熱体を具備し、上記熱応動素子の
動作によつて放電を開始せしめる鉛直点灯用金属
蒸気放電灯において、上記熱応動素子は少なくと
も一つの熱応動素子からなる第１の熱応動素子と
この第１の熱応動素子よりも遅れて動作し、上記
補助極側に接続される少なくとも一つの熱応動素
子からなる第２の熱応動素子とを直列に接続して
なり、かつ上記第１の熱応動素子と上記第２の熱
応動素子との接続部と上記加熱体との最短距離
を、上記第１の熱応動素子と上記加熱体との最短
距離よりも短くするとともに、第２の熱応動素子
の熱応動部を第１の熱応動素子の熱応動部より、
上記加熱体から遠くにかつ鉛直方向で下側に配置
し、さらに上記加熱体は上記第１の熱応動素子が
溶着した状態で上記第２の熱応動素子が動作した
時、第１の熱応動素子と第２の熱応動素子との接
続部と、当該加熱体との間に起こる放電によつて
溶断されることを特徴とする金属蒸気放電灯。1. An arc tube having at least one pair of main electrodes in the outer bulb, an indirectly heated thermally responsive element connected to an auxiliary electrode disposed close to one main electrode of the arc tube, and an indirectly heated thermally responsive element connected to the one main electrode of the arc tube. In a metal vapor discharge lamp for vertical lighting, the lamp is equipped with a heating body connected to the thermally responsive element and heats the thermally responsive element, and the discharge is started by the operation of the thermally responsive element, wherein the thermally responsive element comprises at least one thermally responsive element. A first thermally responsive element and a second thermally responsive element, which operates later than the first thermally responsive element and is connected to the auxiliary pole side, are connected in series. and the shortest distance between the connecting portion of the first thermally responsive element and the second thermally responsive element and the heating body is shorter than the shortest distance between the first thermally responsive element and the heating body. At the same time, the thermally responsive part of the second thermally responsive element is separated from the thermally responsive part of the first thermally responsive element,
The heating element is disposed far from the heating element and vertically below the heating element, and when the second thermal element operates with the first thermal element welded, 1. A metal vapor discharge lamp characterized in that the lamp is fused by an electric discharge that occurs between the connecting portion between the element and the second thermally responsive element and the heating body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3655079A JPS55128247A (en) | 1979-03-28 | 1979-03-28 | Metal vapor discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3655079A JPS55128247A (en) | 1979-03-28 | 1979-03-28 | Metal vapor discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55128247A JPS55128247A (en) | 1980-10-03 |
| JPS624821B2 true JPS624821B2 (en) | 1987-02-02 |
Family
ID=12472865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3655079A Granted JPS55128247A (en) | 1979-03-28 | 1979-03-28 | Metal vapor discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55128247A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08251789A (en) * | 1995-03-08 | 1996-09-27 | Yasuyuki Nakagawa | Housing cover for electric wire and cable |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141058A (en) * | 1979-04-20 | 1980-11-04 | Hitachi Ltd | Discharge lamp lighting device |
-
1979
- 1979-03-28 JP JP3655079A patent/JPS55128247A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08251789A (en) * | 1995-03-08 | 1996-09-27 | Yasuyuki Nakagawa | Housing cover for electric wire and cable |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55128247A (en) | 1980-10-03 |
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