JPS6168855A - High pressure sodium lamp - Google Patents

Abstract

PURPOSE:To prevent any decrease in the life of the stabilizer by connecting the emitter tube in series with a body consisting of a resistor for heating and breaking a glass case charged with oxygen and a thermoresponsible switch which is open during lighting of the lamp (these two members are connected parallel to each other) and installing these members in the outer tube. CONSTITUTION:Conductors 2 and 2 made of niobium and having an electrode in their end, are fused to the ends of an emitter tube 1. An outer tube 4 is evacuated to produce a hard vacuum. The interior of a glass case 6 is charged with oxygen at 3 atmospheric pressures and a resistor 7 is wound around the outer surface of the glass case 6. During the time when the lamp is in a stable state, a thermoresponsible switch 8 is opened by the heat of the emitter tube 1 and therefore a current flows in the resistor 7. When the lamp current abnormally increases due to a starting rare gas flowing out from the emitter tube 1, the resistor 7 becomes red-hot to break the glass case 6 and to cause the internal oxygen gas to flow into the outer tube 4 thereby oxidizing the conductors 2 and 2'. As the result, the electric conduction between the conductors 2 and 2' and emission tube supporters 3 and 3' is blocked, thereby preventing the operation of the emitter tube 1.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、外管的全真空にした高圧ナトリウムランプに
関するものである。DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to high-pressure sodium lamps with a full vacuum on the outer envelope.

従来例の構成とその問題点 従来の高圧ナトリウムランプにおいて、発光管にクラッ
クが生じたり、発光管封止部の気密性が低下したりして
、発生管内に封入されている始動用希ガスが外管内に流
出した場合には、ランプ電流が増大し、とくに連続点灯
のときには安定器の焼損をまねく危険性があった。Conventional structure and problems In conventional high-pressure sodium lamps, cracks occur in the arc tube, the airtightness of the arc tube seal decreases, and the starting rare gas sealed in the generator tube leaks. If it leaked into the outer bulb, the lamp current would increase, and there was a risk of burning out the ballast, especially when the lamp was lit continuously.

発明の目的 本発明はこのような危険性のない高圧ナトリウムランプ
を提供するものである。OBJECTS OF THE INVENTION The present invention provides a high pressure sodium lamp free of such risks.

発明の構成 本発明は内部が真空にされた外管内に、先端に電極を有
する導電体が両端部に封着され、かつ内部にナトリウム
、緩衝ガス用金属および始動用希ガスが封入された発光
管と内部に酸素が封入されたガラス容器とを設けるとと
もに、前記ガラス容器全加熱破壊するための抵抗体とラ
ンプ点灯中は開放状態になる熱応動スイッチとの並列体
を前記発光管と直列に接伏し、前記抵抗体に異常電流が
流れたときに前記ガラス容器が破壊されて内部の酸素を
前記外管内に放出して、前記導電体を酸化し不導通とな
すように構成されている高圧ナトリウムランプを特徴と
するものである。Structure of the Invention The present invention is a light-emitting device in which a conductor having an electrode at the tip is sealed at both ends in an outer tube whose inside is evacuated, and sodium, a metal for buffer gas, and a rare gas for starting are sealed inside. A tube and a glass container in which oxygen is sealed are provided, and a parallel body including a resistor for completely heating and destroying the glass container and a thermally responsive switch that is open when the lamp is lit is connected in series with the arc tube. The high voltage is configured such that when the glass container is grounded and an abnormal current flows through the resistor, the glass container is broken and the oxygen inside is released into the outer tube, thereby oxidizing the conductor and making it non-conductive. It features a sodium lamp.

実施例の説明 以下、本発明の一実症例について図面を用いて説明する
。DESCRIPTION OF EMBODIMENTS An example of the present invention will be described below with reference to the drawings.

図において、１は透光性アルミナ管からなる発光管で、
先端に電極を有するニオビウムなどからなる導電体２，
２′が両端部に封着され、内部にはナトリウム、水銀な
どの緩衝ガス用金属およびキセノンなどの始動用希ガス
が封入されている。発光管１は導電体２，２１が発光管
支持体３，３′により保持されて、外管４内に支持され
ている。外管４内はバリウムゲッタ５を用いて高真空に
排気されている。６は内容積約５０ＣＧのガラス容器で
あって、内部には酸素が３気圧封入されている。In the figure, 1 is an arc tube made of a translucent alumina tube.
A conductor 2 made of niobium or the like with an electrode at the tip,
2' are sealed at both ends, and the inside is filled with buffer gas metals such as sodium and mercury, and starting rare gases such as xenon. The arc tube 1 is supported within an outer bulb 4 with conductors 2 and 21 held by arc tube supports 3 and 3'. The inside of the outer tube 4 is evacuated to a high vacuum using a barium getter 5. 6 is a glass container with an internal volume of about 50 CG, and 3 atmospheres of oxygen is sealed inside.

ガラス容器６の外面には抵抗体アが巻きつけられて付設
されている。さらに、抵抗体７と並列にバイメタルなど
の熱応動スイッチ８が接続されている。抵抗体７と熱応
動スイッチ８との並列体は発光管１に直列に接続されて
いる。熱応動スイッチ８はランプが点灯していない伏仰
では閉成しているが、ランプ点灯中は開放して抵抗体７
に通電がなされる。すなわち、ランプ始動直後のランプ
電圧が低くてランプ電流が多い立上り時には、熱応動ス
イッチ８が閉じた状態にあるので、抵抗体７はほとんど
発熱しないが、ランプが安定した状態では発光管１から
の熱で熱応動スイッチ８が開放されるので、抵抗体７に
電流が流れる。しかし、発光管１から始動用希ガスが外
管４内に流出していない正常点灯の場合においては、抵
抗体７はガラス容器６を破壊しない程度の発熱量となる
ように設定されている。一方、発光管１から始動用希ガ
スが流出してランプ電流が異常に増大した場合には、抵
抗体７が赤熱して、ガラス容器６を破壊し、内部の酸素
ガスを外管４内に流出させ、これによって導電体２　、
２’　を酸化させて発光管支持体３．３′との電気的接
続を不導通にする結果、発光管１が動作不能となる。な
お、図中、９は口金、１０は安定器を示す。A resistor A is attached to the outer surface of the glass container 6 by being wound around it. Further, a thermally responsive switch 8 made of bimetal or the like is connected in parallel with the resistor 7 . A parallel body of a resistor 7 and a thermally responsive switch 8 is connected in series to the arc tube 1. Thermal response switch 8 is closed when the lamp is not lit and is in the prone position, but when the lamp is lit it is open and the resistor 7 is closed.
is energized. That is, when the lamp voltage is low and the lamp current is high immediately after starting the lamp, the thermal response switch 8 is in a closed state, so the resistor 7 generates almost no heat, but when the lamp is stable, the heat from the arc tube 1 is reduced. Since the thermally responsive switch 8 is opened by the heat, current flows through the resistor 7. However, in the case of normal lighting in which the starting rare gas does not flow out from the arc tube 1 into the outer bulb 4, the resistor 7 is set to generate enough heat to not destroy the glass container 6. On the other hand, if the starting rare gas flows out of the arc tube 1 and the lamp current increases abnormally, the resistor 7 becomes red hot, breaks the glass container 6, and releases the oxygen gas inside into the outer tube 4. This causes the conductor 2,
2' oxidizes and renders the electrical connection with the arc tube support 3.3' non-conductive, rendering the arc tube 1 inoperable. In addition, in the figure, 9 indicates a base and 10 indicates a stabilizer.

次に、本発明の具体例について説明する。Next, specific examples of the present invention will be described.

発光管内に始動用希ガスとして約２０Ｔｏｒｒのキセノ
ンを封入した１ｓｏＷの高圧ナトリウムランプにおいて
、開放温度約２００Ｃのバイメタルスイッチを、ランプ
の通常の動作状態における温度がこれ以上となる外管内
の場所に配置するとともに約２．６Ａの電流を流したと
きに自己発熱により５ｏｏｃ以上となるタングステン線
からなる抵抗線全軟質ガラス（ソーダガラス）からなる
ガラス容器に接触させて取り付け、先に述べたように構
成した高圧ナトリウムランプを作り、通常の方法でラン
プを動作させた直後に安定器のインピーダンスを急激に
減少させて１発光管に流れる電流を急激に増加させる方
法で、発光管にクラックを生じさせ、発光管の始動用希
ガスとし封入しであるキセノンガスを外管内に流出させ
た。このときランプ電流が通常点灯時の約２Ａから２．
７Ａと増大することにより、タングステン線が赤熱して
ガラス容器全破壊して内部に封入されている酸素を外管
内に流出させた。その結果、点灯してから約１５分後に
ニオビウムからなる外径３醍の管状の導電体が酸（５さ
れて（金属部で最も高温になっているため最も酸化され
やすい）、発光管支持体との電気的接続が不導通となり
、ランプは以後動作不能となった。In a 1soW high-pressure sodium lamp with approximately 20 Torr of xenon sealed as a starting rare gas in the arc tube, a bimetal switch with an opening temperature of approximately 200 C is placed in the outer bulb at a location where the lamp's normal operating temperature is higher than this. At the same time, when a current of about 2.6 A is applied, a resistance wire made of tungsten wire which generates heat of 5 ooc or more due to self-heating is attached in contact with a glass container made entirely of soft glass (soda glass), and is configured as described above. Immediately after operating the lamp in the normal manner, the impedance of the ballast is suddenly reduced and the current flowing through one arc tube is rapidly increased, causing cracks in the arc tube. Xenon gas, which was sealed as a rare gas for starting the arc tube, was allowed to flow into the outer tube. At this time, the lamp current increases from about 2A during normal lighting to 2.
As the temperature increased to 7A, the tungsten wire became red hot and completely destroyed the glass container, causing the oxygen sealed inside to flow out into the outer tube. As a result, approximately 15 minutes after the light was turned on, a tubular conductor made of niobium with an outer diameter of 3 mm was exposed to acid (the metal part is at the highest temperature and is most easily oxidized), and the arc tube support was exposed to acid. The electrical connection was broken and the lamp was no longer operable.

なお、上記実施例では、安定器に始動回路と内蔵した、
いわゆる外部始動装置方式の高圧ナトｌ）ラムの例につ
いて説明したが、本発明は外管内に始動装置を内蔵した
、いわゆる始動装置内梁形高圧ナトＩＪウムランプに適
用しても同様の効果が得られるのはいうまでもない。In addition, in the above embodiment, the ballast has a built-in starting circuit.
Although an example of a so-called external starter-type high-pressure natto IJ lamp has been described, the present invention can also be applied to a so-called starter internal beam type high-pressure nato IJum lamp with a built-in starter inside the outer tube, and similar effects can be obtained. Needless to say, it is possible.

発明の詳細 な説明したように、本発明は動程中に発光管の始動用希
ガスが外管内に流出した場合にランプを自動的に動作不
能に至る機能を有するので、安定器の寿命の短縮を防止
することが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。As described in detail, the present invention has a function that automatically renders the lamp inoperable if the starting noble gas of the arc tube leaks into the outer bulb during operation, thereby reducing the lifespan of the ballast. It is possible to provide a high-pressure sodium lamp that has the excellent effect of preventing shortening.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本発明の一実癩例である高圧ナトリウムランプの正
面図である。 １・・・・・・発光管、２，２′・・・・・・導電体、
３，３′・・・・・・発光管支持体、４・・・・外管、
６・・・・・・ガラス容器、７・・・・・・抵抗体、８
・・・・・熱応動スイッチ、１０・・・・・・安定器。The figure is a front view of a high-pressure sodium lamp which is an example of the present invention. 1... Arc tube, 2, 2'... Conductor,
3, 3'... Arc tube support, 4... Outer tube,
6...Glass container, 7...Resistor, 8
...Thermal response switch, 10...Stabilizer.

Claims (1)

【特許請求の範囲】[Claims] 内部が真空にされた外管内に、先端に電極を有する導電
体が両端部に封着され、かつ内部にナトリウム、緩衝ガ
ス用金属および始動用希ガスが封入された発光管と内部
に酸素が封入されたガラス容器とを設けるとともに、前
記ガラス容器を加熱破壊するための抵抗体とランプ点灯
中は開放状態になる熱応動スイッチとの並列体を前記発
光管と直列に接続し、前記抵抗体に異常電流が流れたと
きに前記ガラス容器が破壊されて内部の酸素を前記外管
内に放出して、前記導電体を酸化し不導通となすように
構成されていることを特徴とする高圧ナトリウムランプ
。A conductor with an electrode at the tip is sealed at both ends in an outer tube whose inside is evacuated, and an arc tube with sodium, buffer gas metal, and starting rare gas sealed inside, and oxygen inside. A parallel body consisting of a resistor for heating and destroying the glass container and a thermally responsive switch that is open when the lamp is lit is connected in series with the arc tube, and the resistor The high-pressure sodium is characterized in that when an abnormal current flows through the glass container, the glass container is broken and the oxygen inside is released into the outer tube, thereby oxidizing the conductor and making it non-conductive. lamp.