JPS6171544A - High pressure electric-discharge lamp - Google Patents

Abstract

PURPOSE:To prevent the forming of curve, flicker and going out at an arc column by applying forced power to charged particles in a light emitted tube so as to have its accelerated oscillating force after detecting an acoustic resonance phenomenon, when it is generated in the light emitted tube of a high pressure electric-discharge lamp. CONSTITUTION:A high-frequency burning circuit 12 is connected to electrodes 2a, 2b of a light emitted tube 1 which is enclosed in the outside tube 8 of a high pressure electric-discharge lamp, and high-frequency burning is made to perform. And, an acoustic resonance phenomenon is generated in the light emitted tube 1, and when the the changing at an arc column is generated, making a forced power impressing device 14 to operate after detecting the changing of discharging characteristics with a detector 13, and impressing an electric field to plasma which is discharging by electrodes 10a, 10b which are used for impressing the electric field and are arranged behind the electrodes 2a, 2b, and the forced power is applied to its charged particles; therefore, making it to generate the difference between pressure changing at the tube inside and its natural frequency, and enabling it to eliminate standing a stationary wave, and the generating of the acoustic resonance phenomenon is prevented, so that the stable burning can be obtained.

Description

【発明の詳細な説明】 （技術分野） 本発明は、高圧放電灯を高周波点灯して成る高圧放電灯
装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a high-pressure discharge lamp device in which a high-pressure discharge lamp is lit at high frequency.

（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ｌ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 the 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１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. Further, an appropriate amount of a rare gas and a luminescent substance are sealed inside the arc tube 1, gas is sealed inside an 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、放電灯の
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 discharge lamp, making the ballast smaller and lighter due to the electronic lighting circuit, and reducing loss. 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, causing arc column curvature, fluctuation, extinction, 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
る周波数領域で点灯させれば良いが、この安定周波数領
域はランプの種類によって異なり、また、同一種類のラ
ンプでもランプ間によるばらつきがあるため、特定の周
波数を設定することは難しい。In order to ensure stable lighting, high-pressure discharge lamps should be lit in a frequency range in which they can be lit stably, but this stable frequency range varies depending on the type of lamp, and even among lamps of the same type there are variations between lamps. Therefore, it is difficult to set a specific frequency.

また、１００ｋＨｚ以上の周波数での点灯、直流点灯、
矩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, lighting at a frequency of 100kHz or higher, direct current lighting,
There is a method of avoiding the acoustic resonance phenomenon by using square wave lighting, etc., but such lighting methods have problems such as complicating the circuit configuration and generating radiated radio noise.

（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
象の生じない高圧放電灯装置を提供するにある。(Object of the Invention) The present invention has been made in view of the above-mentioned drawbacks, and its object is to provide a high-pressure discharge lamp device in which no acoustic resonance phenomenon occurs even when the lamp is lit at a high frequency.

（発明の開示） まず、音響的共鳴現象について説明する。高圧放電灯を
交流で点灯した場合、発光管内の電子、イオンは電界に
よって加速され発光管内を運動する。その運動過程で、
−荷電粒子は発光管内の中性原子と衝突する。そして荷
電粒子及び衝突によって運動エネルギーを得た中性原子
の運動が加振力となり、発光管内の封入物等によって決
まる発光管内の音速、及び発光管形状により決まる固有
振動数と共鳴することにより定在波が立つために音響的
共鳴現象が生じる。(Disclosure of the Invention) First, the acoustic resonance phenomenon will be explained. When a high-pressure discharge lamp is lit with alternating current, electrons and ions within the arc tube are accelerated by the electric field and move within the arc tube. In the movement process,
-Charged particles collide with neutral atoms in the arc tube. The motion of the charged particles and the neutral atoms that have gained kinetic energy through collision becomes an excitation force, which resonates with the sound velocity inside the arc tube determined by the inclusions in the arc tube, and the natural frequency determined by the shape of the arc tube. Acoustic resonance occurs due to the presence of waves.

本発明はかかる点に鑑みてなされたもので、固有振動数
と加振力による管内の圧力変動の一致により生じていた
音響的共鳴現象において、加振力となる発光管内の荷電
粒子に強制力を加え、管内の圧力変動と固有振動数と間
に差を生じさせ、定在波を立たなくさせることにより音
響的共鳴現象を回避したものである。The present invention has been made in view of this point, and in the acoustic resonance phenomenon that occurs due to the coincidence of the natural frequency and the pressure fluctuation in the tube due to the excitation force, a force is applied to the charged particles in the arc tube that serve as the excitation force. This method avoids acoustic resonance by creating a difference between the pressure fluctuations in the pipe and the natural frequency, and preventing standing waves from forming.

以下、発光管内の荷電粒子に加える強制力として、電界
及び磁界を利用した例について、それぞれ第２図及び第
３図を参照して説明する。Examples in which an electric field and a magnetic field are used as forcing forces applied to charged particles within an arc tube will be described below with reference to FIGS. 2 and 3, respectively.

まず、第２図において、１１は電源、１２は高周波点灯
回路で放電灯の電極２ａ、２ｂに接続されている。また
、その両電極２ａ、２ｂには放電特性（ランプ電圧、ラ
ンプ電流）検出回路１３が接続されており、その検出回
路１３の出力には、発光管１内で、且つそれぞれの電極
２ａ、　　２ｂの後方に配設された電界印加用電極ｉｏ
ａ、１０ｂに電圧を印加するための強制力印加装置１４
に接続されている。First, in FIG. 2, 11 is a power source, and 12 is a high frequency lighting circuit, which is connected to the electrodes 2a and 2b of the discharge lamp. Further, a discharge characteristic (lamp voltage, lamp current) detection circuit 13 is connected to both electrodes 2a, 2b, and the output of the detection circuit 13 is connected to the discharge characteristics (lamp voltage, lamp current) detecting circuit 13. An electric field applying electrode io arranged behind the
Force application device 14 for applying voltage to a and 10b
It is connected to the.

而して、発光管１内で音響的共鳴現象が生じ、アーク柱
に変化が生じ始めた際に、その放電特性（ランプ電圧、
ランプ電流）の変化を検出回路１３で検出し、強制力印
加装置１４を作動させ、電界印加用電極１０ａ、１０ｂ
により放電しているプラズマに電界を印加し、荷電粒子
に強制力を加える。When an acoustic resonance phenomenon occurs within the arc tube 1 and changes begin to occur in the arc column, its discharge characteristics (lamp voltage,
The detection circuit 13 detects a change in the lamp current (lamp current), activates the force application device 14, and applies the electric field to the electrodes 10a, 10b.
This applies an electric field to the discharging plasma, applying a forcing force to the charged particles.

次に、第３図に示すものは、上記強制力印加装置１４の
出力を発光管１に巻き付けたコイル１５ニ接続し、コイ
ル１５に電流を流すことによって生じる磁界により、荷
電粒子に強制力を加えようとするものである。なお、第
２図に示す構成と同等構成個所に同一符号を付すことに
より、その構成の説明を省略する。Next, in the device shown in FIG. 3, the output of the force applying device 14 is connected to a coil 15 wound around the arc tube 1, and a force is applied to the charged particles by the magnetic field generated by passing a current through the coil 15. That's what I'm trying to add. Components that are equivalent to those shown in FIG. 2 are denoted by the same reference numerals, and a description of the components will be omitted.

（発明の効果） 本発明は上記のように、高圧放電灯を高周波点灯して成
る高圧放電灯装置において、高圧放電灯の発光管内の荷
電粒子に強制力を加え、発光管内の圧力変動と固有撮動
数と間に差を生じせしめ、発光管内に定在波の立つのを
抑制したことにより、従来、高周波点灯したとき生じて
いた音響的共鳴現象を回避することができ、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
、発光管の破損等を防止でき、安定した点灯を維持する
ことができる。(Effects of the Invention) As described above, in a high-pressure discharge lamp device in which a high-pressure discharge lamp is lit at high frequency, the present invention applies a forcing force to the charged particles in the arc tube of the high-pressure discharge lamp, thereby reducing pressure fluctuations within the arc tube. By creating a difference between the number of shots and suppressing the standing waves in the arc tube, it is possible to avoid the acoustic resonance phenomenon that conventionally occurs when high frequency lighting is performed, and the acoustic resonance phenomenon It is possible to prevent arc column curvature, fluctuation, extinguishing, and damage to the arc tube caused by this, and it is possible to maintain stable lighting.

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

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図はそれぞれ本発明を説明する概念図である。FIG. 1 is a front view showing an example of a conventional high-pressure discharge lamp, and FIGS. 2 and 3 are conceptual diagrams illustrating the present invention, respectively.

Claims (1)

【特許請求の範囲】[Claims] （１）高圧放電灯を高周波点灯して成る高圧放電灯装置
において、高圧放電灯の発光管内の荷電粒子に強制力を
加え、発光管内の圧力変動と固有振動数と間に差を生じ
せしめ、発光管内に定在波の立つのを抑制したことを特
徴とする高圧放電灯装置。(1) In a high-pressure discharge lamp device in which a high-pressure discharge lamp is lit at high frequency, a forcing force is applied to the charged particles in the arc tube of the high-pressure discharge lamp to create a difference between the pressure fluctuation in the arc tube and the natural frequency, A high-pressure discharge lamp device characterized by suppressing standing waves within an arc tube.