JPS60262346A - High pressure discharge lamp - Google Patents

Abstract

PURPOSE:To avoid acoustic resonance by making uneven temperature distribution inside a luminescent tube in a lighting state. CONSTITUTION:A film 10 such as indium oxide film which reflects infrared rays or selectively transmits them is partially formed on the outer surface of a luminescent tube 1. Thereby, temperature difference is produced on the tube inner surface of the luminescent tube 1 and it results in uneven temperature distribution inside the tube 1. Resonance is partially produced without producing in the whole area inside the tube 1. Since acoustic resonance is produced only in partial area, deformation of an arc column is prevented.

Description

【発明の詳細な説明】 （技術分野） 本発明は高圧放電灯に関する。[Detailed description of the invention] (Technical field) The present invention relates to a high pressure discharge lamp.

（背景技術） 第１図は従来の高圧放電灯の一例を示し、石英等で形成
された発光管１の両端には電極２ａ、２ｂが対向して配
設され、該両電極２ａ、２ｂは封止部３ａ、３ｂに封入
されたモリブデン箔等の金属箔４ａ、４ｂに接続されて
いる。金属箔４ａ。(Background Art) FIG. 1 shows an example of a conventional high-pressure discharge lamp, in which electrodes 2a and 2b are arranged facing each other at both ends of an arc tube 1 made of quartz or the like. It is connected to metal foils 4a and 4b such as molybdenum foil sealed in the sealing parts 3a and 3b. Metal foil 4a.

４ｂは発光管１の支持も兼ねる支持導線５ａ、５ｂに接
続されており、発光管１は固定治具６ａ。4b is connected to support conductors 5a and 5b which also serve as support for the arc tube 1, and the arc tube 1 is fixed to a fixture 6a.

６ｂを介して支持導線５ａ、５ｂに固定されている。支
持導線５ａ、５ｂは口金７を介して外部回路に接続され
る。また、発光管ｌ内には希ガス及び発光物質が適量封
入されており、発光管１を被う外管８内にはガスが封入
され、外管８の内面には螢光体９が塗布されている。It is fixed to support conductors 5a and 5b via 6b. Support conductors 5a and 5b are connected to an external circuit via a base 7. In addition, an appropriate amount of rare gas and a luminescent substance are sealed in the arc tube 1, gas is sealed in the outer tube 8 that covers the arc tube 1, and a phosphor 9 is coated on the inner surface of the outer tube 8. has been done.

かかる従来の高圧放電灯を高周波点灯すると、秋電灯の
発光効率の向上、点灯回路の電子化による安定器の小型
・軽量化、低損失化という利点がある一方、特定の周波
数（発光管内の封入物質等で決まる発光管内の音速と、
発光管形状で決まる共鳴周波数）で音響的共鳴現象が生
じ、アーク柱の湾曲、揺らぎ、立ち消え、発光管の破損
等が発生するといった欠点がある。High-frequency lighting of such conventional high-pressure discharge lamps has the advantages of improving the luminous efficiency of the light bulb, making the ballast smaller and lighter, and reducing loss due to the electronic lighting circuit. The speed of sound inside the arc tube is determined by the material, etc.
Acoustic resonance occurs at the resonant frequency determined by the shape of the arc tube, resulting in arc column curvature, fluctuation, fading, and damage to the arc tube.

安定に点灯するためには、高圧放電灯が安定して点灯す
る領域で点灯させれば良いが、この安定領域はランプの
種類によって異なり、また、同種のランプでもランプご
とにばらつきがあるため、特定の点灯周波数を設定する
ことは難しい。In order to ensure stable lighting, a high-pressure discharge lamp should be lit in a stable lighting range, but this stable range varies depending on the type of lamp, and even among lamps of the same type, there are variations from lamp to lamp. It is difficult to set a specific lighting frequency.

また、　１００ｋｌｌｚ＝以上の周波数での点灯、直流
点灯、知形波点灯等により音響的共鳴現象を回避する方
法があるが、かかる点灯方法においては、回路構成の複
雑化や放射電波雑音の発生等の問題がある。In addition, there are ways to avoid acoustic resonance by lighting at a frequency of 100kllz or higher, direct current lighting, intelligent wave lighting, etc. However, such lighting methods tend to complicate the circuit configuration, generate radiated radio noise, etc. There is a problem.

（発明の目的） 本発明は、上記欠点に鑑みてなされたもので、その目的
とするところは、高周波点灯した場合にも音響的共鳴現
象の生しない高圧放電灯を提供するにある。(Object of the Invention) The present invention was made in view of the above-mentioned drawbacks, and its object is to provide a high-pressure discharge lamp that does not cause acoustic resonance even when lit at high frequencies.

（発明の開示） 本発明は、点灯状態における発光管内の温度分布を不均
一にすることにより、音響的共鳴現象を回避したことを
特徴とする。(Disclosure of the Invention) The present invention is characterized in that the acoustic resonance phenomenon is avoided by making the temperature distribution within the arc tube non-uniform in the lighting state.

まず、音響的共鳴現象について説明する。音響的共鳴現
象は、発光管形状と封入物で決まる固有振動数と、入力
電力の時間的変化による発光管内の圧力変動とが一致し
た時に定在波が立つために生じる現象である。First, the acoustic resonance phenomenon will be explained. Acoustic resonance is a phenomenon that occurs when a standing wave is created when the natural frequency determined by the arc tube shape and the enclosed material matches the pressure fluctuation within the arc tube due to temporal changes in input power.

発光管内の封入物と発光管内の温度で決まる発光管内の
音速Ｃは次式で表される。The sound velocity C inside the arc tube, which is determined by the contents inside the arc tube and the temperature inside the arc tube, is expressed by the following equation.

ただし γ：　Ｃｐ／　Ｃｖ　（Ｃｐ　：定圧比熱、Ｃｖ：定積
比熱）Ｒ：気体定数 ′Ｆ：発光管内の温度 Ｍ：発光管内の質量 発光管内の温度分布は、アーク柱中心部が最も高く管壁
に近づくに従って低くなる。このような発光管を有する
高圧放電灯は、発光管長軸方向のどこでも同一の温度分
布を持つので、高周波で点灯すると発光管全体で共鳴が
起こり、その結果体した力が、アーク柱自体が有する安
定に放電を持続させようとする力に打ち勝ち、アーク柱
が変形する。そこで、発光管内の温度分布に乱れを生じ
させると、共鳴現象は発光管内全体にわたらす、部分的
にしか発生しなくなる。すなわち、音響的共鳴現象は発
光管内で（”１ｂ分的にしか生しないために、アーク柱
の変形には敗らない。However, γ: Cp/Cv (Cp: Specific heat at constant pressure, Cv: Specific heat at constant volume) R: Gas constant 'F: Temperature inside the arc tube M: Mass inside the arc tube The temperature distribution inside the arc tube is highest at the center of the arc column. It gets lower as you get closer to the wall. A high-pressure discharge lamp with such an arc tube has the same temperature distribution everywhere along the long axis of the arc tube, so when lit at high frequency, resonance occurs throughout the arc tube, and the resulting force is transferred to the arc column itself. The arc column deforms as it overcomes the force that keeps the discharge stable. Therefore, if the temperature distribution within the arc tube is disturbed, the resonance phenomenon will occur only partially throughout the arc tube. That is, since the acoustic resonance phenomenon occurs only within the arc tube (1b), it is not defeated by the deformation of the arc column.

次に、発光管内の温度分布に乱れを生じさす手段につい
て述べる。Next, a means for causing disturbance in the temperature distribution within the arc tube will be described.

第２図は発光管１の外面に赤外線を反射または選択的に
透過させる膜１０　（例えば、酸化インジウム）を部分
的に塗布した例である。このように赤外線を反射または
選択的に透過させる膜１０を部分的に塗布したことによ
り、発光管１内の管壁表面に温度差が生じ、その影響に
より発光管１内の温度分布に乱れが生しる。なお、上記
実施例では赤外線を反射または選択的に透過させる膜１
０を部分的に塗布したが、塗布する膜の膜厚あるいは塗
布する腔の材質濃度を変化させても同様の効果が得られ
る。FIG. 2 shows an example in which the outer surface of the arc tube 1 is partially coated with a film 10 (for example, indium oxide) that reflects or selectively transmits infrared rays. By partially applying the film 10 that reflects or selectively transmits infrared rays in this way, a temperature difference is generated on the tube wall surface inside the arc tube 1, and this effect causes disturbances in the temperature distribution inside the arc tube 1. Live. In addition, in the above embodiment, the film 1 that reflects or selectively transmits infrared rays is
Although 0 was applied partially, the same effect can be obtained by changing the thickness of the applied film or the material concentration of the cavity to be applied.

第３図は発光管１の肉厚を不均一にした例である。この
上・うに構成することにより、発光管１かＣ）外側への
熱伝導率が部分的に変化するため、発光管１の管壁の温
度分布に乱れか生じ、前記実施例と同様の効果が得られ
る。FIG. 3 shows an example in which the wall thickness of the arc tube 1 is made non-uniform. With this configuration, the thermal conductivity to the outside of the arc tube 1 partially changes, causing disturbance in the temperature distribution on the wall of the arc tube 1, resulting in the same effect as in the previous embodiment. is obtained.

さらに異なる実施例として、第１図に示す外管８の内面
に赤外線反射膜（例えば酸化チタンを主成分としたもの
）を不均一に塗布しても、前記実施例と同様の効果が得
られる。すなわち、赤外線反射膜で反射された赤外線に
より、発光管１が不均一に熱せられ、発光管１の管壁温
度は不均一になり、その影響により発光管１内の温度分
布に乱れが生しることによる。なお、不均一に赤外線反
射膜を塗布する手段としては、部分的に塗ったり、膜厚
を変化させたり、赤外線反射膜の材質を変えたりしても
よい。□ （発明の効果） 本発明は上記のように、点灯状態における発光管内の温
度分布を不均一にする手段を外管または発光管に設けた
ことにより、共鳴現象は発光管内全体にわたらず、部分
的にしか発生しなくなる。As a further different embodiment, the same effect as in the previous embodiment can be obtained even if an infrared reflective film (for example, one containing titanium oxide as a main component) is applied unevenly to the inner surface of the outer tube 8 shown in FIG. . That is, the arc tube 1 is heated non-uniformly by the infrared rays reflected by the infrared reflective film, and the temperature of the tube wall of the arc tube 1 becomes non-uniform, which causes disturbances in the temperature distribution inside the arc tube 1. Depends on the situation. In addition, as means for applying the infrared reflective film non-uniformly, it is possible to apply it partially, change the film thickness, or change the material of the infrared reflective film. □ (Effects of the Invention) As described above, the present invention provides means for making the temperature distribution inside the arc tube non-uniform during the lighting state in the outer bulb or the arc tube, so that the resonance phenomenon does not spread throughout the entire interior of the arc tube. It only occurs partially.

すなわち、音響的共鳴現象は発光管内で部分的にしか生
しないために、アーク柱の変形には致らない。従って、
本発明に係る高圧放電灯を高周波点灯した場合、音響的
共鳴現象によって生じるアーク柱の湾曲、揺らぎ、立ち
消え、発光管の破損等が防止でき、安定した点灯を維持
することができる。That is, since the acoustic resonance phenomenon occurs only partially within the arc tube, it does not result in deformation of the arc column. Therefore,
When the high-pressure discharge lamp according to the present invention is lit at high frequency, it is possible to prevent arc column curvature, fluctuation, extinguishing, breakage of the arc tube, etc. caused by acoustic resonance phenomena, and stable lighting can be maintained.

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

第１図は従来の高圧放電灯の一例を示す正面図、第２図
及び第３図は去れぞれ本発明に係る発光管の一例を示し
、第２図は正面図、第３図は一部断面の正面図である。 特許出願人 松下電工株式会社 代理人　弁理士　竹元敏丸 （ほか２名） １′ 第１図 第２図　第３図 −２２’ｍFIG. 1 is a front view showing an example of a conventional high-pressure discharge lamp, FIGS. 2 and 3 are examples of an arc tube according to the present invention, FIG. 2 is a front view, and FIG. 3 is a front view. It is a front view of a partial cross section. Patent applicant Matsushita Electric Works Co., Ltd. Agent Patent attorney Toshimaru Takemoto (and 2 others) 1' Figure 1 Figure 2 Figure 3 - 22'm

Claims (4)

【特許請求の範囲】[Claims] （１）点灯状態における発光管内の温度分布を不均一に
する手段を夕１管または発光管に設けたことを特徴とす
る高圧放電灯。(1) A high-pressure discharge lamp characterized in that the tube or the arc tube is provided with means for making the temperature distribution within the arc tube uneven in the lighting state. （２）上記手段が、発光管の外面に塗布した赤外線を反
射または選択的に透過させる膜である特許請求の範囲第
１項記載の高圧放電灯。(2) The high-pressure discharge lamp according to claim 1, wherein the means is a film applied to the outer surface of the arc tube that reflects or selectively transmits infrared rays. （３）上記手段が、肉厚が不均一の発光管である特許請
求の範囲第１項記載の高圧放電灯。(3) The high-pressure discharge lamp according to claim 1, wherein the means is an arc tube with non-uniform wall thickness. （４）上記手段が、外管の内面に塗布した赤外線反射膜
である特許請求の範囲第１項記載の高圧放電灯。(4) The high-pressure discharge lamp according to claim 1, wherein the means is an infrared reflective film coated on the inner surface of the outer bulb.