JP4327023B2 - Single-sided discharge lamp - Google Patents

Description

本発明は、電極の方向性に優れた片口放電灯に関するものである。 The present invention relates to a single-ended discharge lamp having excellent directionality of the electrode.

片口放電灯は図１のように、一対の電極が並設された状態で発光管部内に配置されており、電極間に電流を流すことによって電極の対向先端同士の間でアークを発生させるものである。アーク放電は、定常点灯時は勿論、特に放電開始時は高圧のブレークスルー電圧を印加するなど非常に微妙なもので、電極間の間隔や先端の向きにより安定的なアーク放電の開始が行われないことがあり、放電灯の信頼性に大きく関係する。   As shown in FIG. 1, the single-end discharge lamp is arranged in the arc tube section with a pair of electrodes arranged side by side, and generates an arc between the opposed tips of the electrodes by passing a current between the electrodes. It is. Arc discharge is very delicate, such as applying a high breakthrough voltage at the start of discharge, especially during steady lighting, and stable arc discharge is started depending on the distance between electrodes and the direction of the tip. It may not be related to the reliability of the discharge lamp.

然しながら、放電灯の封止は、円筒状の外囲器の封止箇所を強熱し、電極基部が溶接されている金属箔が埋設されるように両側から金型で押圧し、封止部を形成するため、前記強熱により軟化した石英ガラスが前記金型の押圧に合わせて流動する。その結果、流動した軟化石英ガラスと共に金属箔が捩れたり移動したりして電極の向きや電極間距離に影響を与える。   However, the discharge lamp is sealed by igniting the sealed portion of the cylindrical envelope and pressing it with a mold from both sides so that the metal foil to which the electrode base is welded is embedded. In order to form, the quartz glass softened by the strong heat flows in accordance with the pressing of the mold. As a result, the metal foil twists or moves with the softened quartz glass that has flowed, affecting the direction of the electrodes and the distance between the electrodes.

電極の反対側にいて金属箔に接続されている外部リード棒は封止部外で接続棒にて接続されているため、封止による軟化石英ガラスの流動によって位置ずれを起こすことはないが、電極側は機械的強度の非常に小さい薄い金属箔に接続されているだけであるから、軟化石英ガラスの流動に大きな影響を受けるものであり、前述のように電極間距離や方向性を正確に出すことは非常に困難であり、片口放電灯の品質に対する低信頼性や低歩留まりの一因でもあった。
特開平４−２３３１５５ Since the external lead rod connected to the metal foil on the opposite side of the electrode is connected by the connecting rod outside the sealing portion, it does not cause displacement due to the flow of the softened quartz glass due to sealing, Since the electrode side is only connected to a thin metal foil with very low mechanical strength, it is greatly affected by the flow of softened quartz glass. It was very difficult to put out, and was also a cause of low reliability and low yield for the quality of the single-end discharge lamp.
JP-A-4-233155

本発明はこのような問題点に鑑みてなされたもので、本発明の解決課題は片口放電灯の電極構造を殆ど変えることなく、特に高い再現性をもって方向性を達成することができる片口放電灯を開発することにある。   The present invention has been made in view of such problems, and the problem to be solved by the present invention is a single-end discharge lamp that can achieve directionality with particularly high reproducibility without substantially changing the electrode structure of the single-end discharge lamp. Is to develop.

請求項１に記載の片口放電灯(A)は「一端に発光管部(1)が形成され、他端に封止部(2)が設けられている外囲器(3)と、発光管部(1)内に並設された一対の電極(4)と、封止部(2)内に埋設され、前記電極基部(5)がその一端に溶接され、外部リード棒(6)がその他端に溶接されている金属箔(7)とで構成されている片口放電灯(A)において、
封止部(2)内に埋設されている電極基部(5)に、金属箔(7)の幅方向に伸びる電極方向位置決め部材(8)が直角に取着され、
電極方向位置決め部材(8)と電極基部(5)との溶接部位において、線材で構成された電極方向位置決め部材(8)或いは電極基部(5)のいずれか一方又は両方を屈曲させて両者の中心線(10)を一致させた」ことを特徴とする。 The single-ended discharge lamp (A) according to claim 1 includes an envelope (3) in which an arc tube portion (1) is formed at one end and a sealing portion (2) is provided at the other end, and an arc tube A pair of electrodes (4) arranged side by side in the part (1), embedded in the sealing part (2), the electrode base (5) is welded to one end, and the external lead rod (6) is the other katakuchi discharge lamp is constructed out with metal foil being welded (7) to the end (a), the
The electrode base positioning member (8) extending in the width direction of the metal foil (7) is attached to the electrode base (5) embedded in the sealing portion (2) at a right angle ,
At the welded part between the electrode direction positioning member (8) and the electrode base (5), either one or both of the electrode direction positioning member (8) and the electrode base (5) made of wire are bent and the center of both Line (10) is matched ".

本発明の電極基部(5)には金属箔(7)の幅方向に伸びる電極方向位置決め部材(8)が取着されているので、封止時に金型(41)(42)によって押圧され、これにより封止部(2)を形成する加熱軟化部位(2a)の軟化ガラスが流動し、その影響を受けて金属箔(7)が若干捩れたとしても電極方向位置決め部材(8)が両側から押し寄せられたガラスの間に挟まれて封止部(2)の中央に位置することになり、電極方向位置決め部材(8)に取り付けられた電極(4)もその作用によって正確にセンター方向に向くようになる。換言すれば、電極方向位置決め部材(8)の存在により、電極(4)の方向性が大幅に向上することになる。   Since the electrode direction positioning member (8) extending in the width direction of the metal foil (7) is attached to the electrode base (5) of the present invention, it is pressed by the mold (41) (42) at the time of sealing, As a result, even if the softened glass of the heat-softened portion (2a) forming the sealing portion (2) flows and the metal foil (7) is slightly twisted under the influence, the electrode-direction positioning member (8) is moved from both sides. The electrode (4) attached to the electrode direction positioning member (8) is also accurately oriented in the center direction by the action, being sandwiched between the pressed glass and positioned at the center of the sealing portion (2). It becomes like this. In other words, due to the presence of the electrode direction positioning member (8), the directionality of the electrode (4) is greatly improved.

以下、本発明を図示実施例に従って詳述する。図１は本発明にかかる片口放電灯(A)の断面図で、図２はそのＸ−Ｘ断面図、図３はそのＹ−Ｙ断面図である。外囲器(3)は、一端に発光管部(1)が形成され、他端に封止部(2)が設けられている片口タイプのもので石英ガラスにて形成されており、その発光管部(1)内に一対の電極(4)が並設されて配置されている。この電極(4)の電極基部(5)は封止部(2)内に埋設されており、同じく封止部(2)内に埋設された金属箔(7)の一端に溶接されている。更に、前記金属箔(7)の他端には外部リード棒(6)が溶接されている。   Hereinafter, the present invention will be described in detail according to illustrated embodiments. FIG. 1 is a cross-sectional view of a single-end discharge lamp (A) according to the present invention, FIG. 2 is a cross-sectional view taken along line XX, and FIG. The envelope (3) is made of quartz glass with a light emitting tube part (1) at one end and a sealing part (2) at the other end, and is made of quartz glass. A pair of electrodes (4) are arranged in parallel in the tube portion (1). The electrode base (5) of the electrode (4) is embedded in the sealing portion (2) and is welded to one end of a metal foil (7) embedded in the sealing portion (2). Furthermore, an external lead rod (6) is welded to the other end of the metal foil (7).

前記電極基部(5)には直交するように電極方向位置決め部材(8)が溶接されている。電極方向位置決め部材(8)の長さは金属箔(7)の幅にほぼ等しい。電極方向位置決め部材(8)の伸長方向(S)は、金属箔(7)の幅方向と並行(図３)あるいは幅方向に一致(図４)している。図３の場合、電極方向位置決め部材(8)が電極基部(5)上に溶接されているだけであるから、電極基部(5)の太さだけ電極方向位置決め部材(8)の伸長方向(S)と金属箔(7)の幅方向とは若干相違するが、図４のように電極方向位置決め部材(8)の溶接部位(9)を屈曲させることにより両者(S)(10)の伸長方向を一致させる事が出来る。電極方向位置決め部材(8)の溶接部位(9)は封止部(2)に埋設される位置で、電極基部(5)であれば金属箔(7)との溶接位置或いは該位置から外れた部分でもよい。 An electrode direction positioning member (8) is welded to the electrode base (5) so as to be orthogonal. The length of the electrode direction positioning member (8) is substantially equal to the width of the metal foil (7). The extension direction (S) of the electrode direction positioning member (8) is parallel to the width direction of the metal foil (7) (FIG. 3 ) or coincides with the width direction (FIG. 4 ). In the case of FIG. 3, since the electrode direction positioning member (8) is only welded onto the electrode base (5), the extension direction of the electrode direction positioning member (8) (S) is equal to the thickness of the electrode base (5). ) And the width direction of the metal foil (7) are slightly different, but by bending the welded part (9) of the electrode direction positioning member (8) as shown in FIG. Can be matched. The welding part (9) of the electrode direction positioning member (8) is a position embedded in the sealing part (2), and if it is the electrode base part (5), the welding position with the metal foil (7) or deviated from the position. It may be a part.

次ぎに本発明に係る放電灯(A)の製造手順を、従来の片口放電灯の製造手順を示す図５〜７に従って簡単に説明する。略Ｕ形に曲成された外部リード用部材(13)の両端にスポット溶接された金属箔(7)及びこの金属箔(7)の他端にスポット溶接された電極(4)と、電極基部(5)に直交させて溶接した電極方向位置決め部材(8)とで構成された電極マウント(M)を外囲器(3)に挿入し、一対の電極(4)を外囲器(3)の閉塞球状空間部(1a) (この部分が発光管部(1)になる。)内に並設させ且つ外囲器(3)の内径より若干幅広に形成された外部リード用部材(13)を外囲器(3)の内面に弾接させて電極マウント(M)を外囲器(3)内に仮止めする。ここで、前記電極(4)は発光管部(1)となる空間部(1a)内に平行して配置される。またこの時、前記空間部(1a)内に必要充填物とキセノンガスのような必要封入ガスが外囲器(3)に封入される。 Next, the manufacturing procedure of the discharge lamp (A) according to the present invention will be briefly described with reference to FIGS. A metal foil (7) spot welded to both ends of an external lead member (13) bent into a substantially U shape, an electrode (4) spot welded to the other end of the metal foil (7), and an electrode base An electrode mount (M) composed of an electrode direction positioning member (8) welded orthogonally to (5) is inserted into the envelope (3), and a pair of electrodes (4) is inserted into the envelope (3) The external lead member (13) formed in parallel within the closed spherical space portion (1a) (this portion becomes the arc tube portion (1)) and slightly wider than the inner diameter of the envelope (3) Is elastically contacted with the inner surface of the envelope (3) to temporarily fix the electrode mount (M) in the envelope (3). Here, the electrode (4) is disposed in parallel in the space (1a) to be the arc tube (1). Further, at this time, the necessary filler and the necessary sealed gas such as xenon gas are sealed in the envelope (3) in the space (1a).

このように電極マウント(M)が装着されると、外囲器(3)の開口端が排気台(30)に装着され、０リング(31)により気密状に保持される。続いて排気台(30)により真空引きが行われ外囲器(3)内が高真空にされた後、アルゴンガス等の不活性ガスが封入され、１,０００℃〜１,０５０℃の温度で必要箇所が所定時間(約１５秒程度)加熱される。この間、外囲器(3)の内部の清浄化のためのアルゴンガスの排気→真空引き→アルゴンガスの封入→アルゴンガスの排気・・・工程(所謂ウォッシング或いはフラッシング工程)が複数回繰り返され、このフラッシングにより金属製の電極マウント(M)や石英ガラス製外囲器(3)から外囲器(3)内に放出された不純物を外囲器(3)から完全に除去する。   When the electrode mount (M) is mounted in this manner, the open end of the envelope (3) is mounted on the exhaust stand (30) and is held airtight by the 0 ring (31). Subsequently, vacuuming is performed by the exhaust stand (30) and the inside of the envelope (3) is evacuated, and then an inert gas such as argon gas is enclosed, and the temperature is between 1,000 ° C. and 1,050 ° C. Then, the necessary part is heated for a predetermined time (about 15 seconds). During this time, the exhaust of argon gas for cleaning the inside of the envelope (3) → evacuation → sealing of argon gas → exhaust of argon gas ... process (so-called washing or flushing process) is repeated several times, By this flushing, impurities released from the metal electrode mount (M) and the quartz glass envelope (3) into the envelope (3) are completely removed from the envelope (3).

その後、金属箔(7)に一致する円筒部分(2a)を強熱し、この部分(2a)を２,１００℃以上の温度まで上昇させる。円筒部分(2a)の温度が所定温度に到達し、加熱部分が軟化状態となると雌雄一対のピンチャ(40)(41)で軟化封止部分をピンチングする。この図が図５〜７である。この封止により封止部(2)内に金属箔(7)、電極基部(5)、外部リード用部材(13)のスポット溶接部分とその近傍部分及び電極方向位置決め部材(8)が埋設される。   Thereafter, the cylindrical portion (2a) coinciding with the metal foil (7) is ignited, and this portion (2a) is raised to a temperature of 2,100 ° C. or higher. When the temperature of the cylindrical portion (2a) reaches a predetermined temperature and the heated portion is in a softened state, the softened and sealed portion is pinched with a pair of male and female pinchers (40) and (41). This figure is shown in FIGS. By this sealing, the metal foil (7), the electrode base (5), the spot welded portion of the external lead member (13) and the vicinity thereof, and the electrode direction positioning member (8) are embedded in the sealing portion (2). The

この時の状況を更に詳述する。ピンチャ(40)(41)にて円筒状の高温軟化部分(2a)を両側から押圧して押し潰していくと前述の金属箔(7)、電極基部(5)、外部リード用部材(13)のスポット溶接部分とその近傍部分及び電極方向位置決め部材(8)が押し潰された高温軟化部分(2a)の内周面にまず接触する。そしてピンチャ(40)(41)の押圧に従ってピンチャ(40)(41)の平板状キャビティ形状に合わせて高温軟化部分(2a)が流動する。このとき、金属箔(7)、電極基部(5)、外部リード用部材(13)のスポット溶接部分とその近傍部分及び電極方向位置決め部材(8)がそれぞれ高温軟化部分(2a)の流動に影響を受け変位する。特に、機械的強度の乏しい金属箔(7)は捻れや曲げを生じ、その結果、金属箔(7)に溶接されている電極(4)の位置変動(特に、その向き)が発生することは従来例で述べたとおりである。   The situation at this time will be described in further detail. When pressing and crushing the cylindrical high-temperature softened part (2a) from both sides with the pincher (40) (41), the above-mentioned metal foil (7), electrode base (5), external lead member (13) First, the spot welded portion, the vicinity thereof, and the electrode direction positioning member (8) are brought into contact with the inner peripheral surface of the crushed high temperature softened portion (2a). As the pinchers (40) and (41) are pressed, the high-temperature softened portion (2a) flows in accordance with the flat cavity shape of the pinchers (40) and (41). At this time, the spot welded portion of the metal foil (7), the electrode base (5), the external lead member (13) and its vicinity, and the electrode direction positioning member (8) affect the flow of the high temperature softened portion (2a), respectively. To be displaced. In particular, the metal foil (7) with poor mechanical strength is twisted and bent, and as a result, the positional variation (particularly the direction) of the electrode (4) welded to the metal foil (7) is not generated. As described in the conventional example.

ところが、本発明の場合には電極方向位置決め部材(8)が存在するので、電極方向位置決め部材(8)がピンチャ(40)(41)によるピンチシール時に高温軟化部分(2a)の内周面のいずれかに偏って埋入しない限り、電極方向位置決め部材(8)は高温軟化部分(2a)の内周面に挟まれた状態で封止部(2)内に埋設されることになる。その結果、電極方向位置決め部材(8)に溶接されている電極(4)の方向も高温軟化部分(2a)の内周面の融着面に一致することになり、両電極(4)は正確にその先端が対向することになる。このとき図４のように電極(4)の中心線(10)と電極方向位置決め部材(8)の伸張方向(S)とが一致するように形成されておればなお好ましい。このようにして封止を行った後、不要箇所を切除して完成品とする。   However, in the case of the present invention, since the electrode direction positioning member (8) exists, the electrode direction positioning member (8) of the inner peripheral surface of the high-temperature softened portion (2a) at the time of pinch sealing by the pincher (40) (41). As long as the electrode direction positioning member (8) is not embedded in any way, the electrode direction positioning member (8) is embedded in the sealing portion (2) while being sandwiched between the inner peripheral surfaces of the high temperature softened portion (2a). As a result, the direction of the electrode (4) welded to the electrode direction positioning member (8) also coincides with the fusion surface of the inner peripheral surface of the high temperature softened portion (2a), and both electrodes (4) are accurate. The tip will be opposite. At this time, it is more preferable that the center line (10) of the electrode (4) and the extension direction (S) of the electrode direction positioning member (8) coincide with each other as shown in FIG. After sealing in this manner, unnecessary portions are cut off to obtain a finished product.

本発明のように電極基部に電極方向位置決め部材を設けることにより、電極の対向方向を正確に設定することができ、製造困難なシングルエンドタイプ放電灯の製品歩留まりの向上に大いに資する処あるものである。   By providing an electrode direction positioning member at the electrode base as in the present invention, the opposing direction of the electrodes can be set accurately, which greatly contributes to improving the product yield of single-end type discharge lamps that are difficult to manufacture. is there.

本発明のシングルエンドタイプ放電灯の断面図。Sectional drawing of the single end type discharge lamp of this invention. 図１のＸ−Ｘ断面図。XX sectional drawing of FIG. 図１のＹ−Ｙ断面図。YY sectional drawing of FIG. 図３の他の実施例の部分断面図。FIG. 4 is a partial cross-sectional view of another embodiment of FIG. 3. 従来の片口放電灯におけるピンチシール前の断面図。Sectional drawing before the pinch seal | sticker in the conventional single-end discharge lamp . 従来の片口放電灯におけるピンチシール時の断面図。Sectional drawing at the time of the pinch seal in the conventional single-end discharge lamp . 図６を直角方向から見たときの断面図。Sectional drawing when FIG. 6 is seen from a right angle direction. 従来例でのシール時に発生した電極の方向ずれを示す断面図。Sectional drawing which shows the direction shift of the electrode which generate | occur | produced at the time of the seal | sticker in a prior art example.

符号の説明Explanation of symbols

(A) 片口放電灯
(1) 発光管部
(2) 封止部
(3) 外囲器
(4) 電極
(5) 電極基部
(6) 外部リード棒
(7) 金属箔
(8) 電極方向位置決め部材
(A) Single-end discharge lamp
(1) Arc tube
(2) Sealing part
(3) Envelope
(4) Electrode
(5) Electrode base
(6) External lead bar
(7) Metal foil
(8) Electrode direction positioning member

Claims (1)

一端に発光管部が形成され、他端に封止部が設けられている外囲器と、発光管部内に並設された一対の電極と、封止部内に埋設され、前記電極基部がその一端に溶接され、外部リード棒がその他端に溶接されている金属箔とで構成されている片口放電灯において、
封止部内に埋設されている電極基部それぞれに、金属箔の幅方向に伸びる電極方向位置決め部材が直角に取着され、
電極方向位置決め部材と前記電極基部との溶接部位において、線材で構成された電極方向位置決め部材或いは電極基部のいずれか一方又は両方を屈曲させて両者の中心線を一致させたことを特徴とする片口放電灯。 An envelope having an arc tube portion formed at one end and a sealing portion provided at the other end, a pair of electrodes arranged in parallel within the arc tube portion, and embedded in the seal portion, the electrode base portion being In a single-end discharge lamp composed of a metal foil welded to one end and an external lead bar welded to the other end,
An electrode direction positioning member extending in the width direction of the metal foil is attached at right angles to each electrode base portion embedded in the sealing portion ,
One end characterized in that either or both of the electrode direction positioning member and the electrode base made of a wire are bent so that the center lines of the electrode direction positioning member and the electrode base are aligned with each other. Discharge lamp.

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