JP2010251334A - Discharge lamp - Google Patents

Discharge lamp Download PDF

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JP2010251334A
JP2010251334A JP2010152648A JP2010152648A JP2010251334A JP 2010251334 A JP2010251334 A JP 2010251334A JP 2010152648 A JP2010152648 A JP 2010152648A JP 2010152648 A JP2010152648 A JP 2010152648A JP 2010251334 A JP2010251334 A JP 2010251334A
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arc tube
tube
discharge lamp
support frame
lamp
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Shinji Taniguchi
谷口  晋史
Yasaburo Takeji
弥三郎 竹治
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GS Yuasa Corp
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GS Yuasa Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of cracks at a sealing part or degradation of lamp characteristics without bringing forth an increase of an arc tube dimension or arc tube material cost in case an output of a discharge lamp is increased, in a discharge lamp using a ceramic tube as the arc tube. <P>SOLUTION: A heat dissipation member is provided at both ends of the arc tube. Further, the heat dissipation member is provided at a sealing part, then the heat dissipation member is connected to a support frame to fix an arc tube to the support frame by the heat dissipation member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、セラミック管を用いた放電灯に関するものである。 The present invention relates to a discharge lamp using a ceramic tube.

近年、セラミック管の一つである透光性アルミナ管を金属ハロゲン化物が封入された発光管として使用したメタルハライドランプが、使用電力150W以下のもので商品化されている。 In recent years, metal halide lamps using translucent alumina tubes, which are one of ceramic tubes, as arc tubes encapsulating metal halides have been commercialized with a power consumption of 150 W or less.

メタルハライドランプの発光管にアルミナ管を使用する利点は、従来メタルハライドランプで一般に使われていた石英ガラス管に比べ、封入物である金属ハロゲン化物に対して科学的、熱的に安定であるために、封入物と石英ガラスとの化学反応によって生じていたようなランプ寿命の低下を抑制でき、寿命特性の向上が期待できることであり、また、石英ガラスより使用限界温度が高いという特徴を生かしたランプの高効率化設計の実現や、石英ガラス製発光管では反応性が大きいために事実上封入できなかったアルカリ金属の封入が可能となるということである。 The advantage of using an alumina tube as the arc tube of a metal halide lamp is that it is scientifically and thermally stable with respect to the metal halide that is the encapsulated material compared to the quartz glass tube generally used in the conventional metal halide lamp. It is possible to suppress the decrease in lamp life that has occurred due to the chemical reaction between the encapsulated material and quartz glass, and to expect improvement in life characteristics, and also to take advantage of the feature that the use limit temperature is higher than that of quartz glass. This means that it is possible to encapsulate alkali metals that could not be encapsulated because quartz glass arc tubes have high reactivity.

発光管にセラミック管を用いる場合、その封止は、図4に示されるような、電極芯4に接続され、モリブデン線3、ニオブ線1が溶接等で接続されてなるエンドディスクを電気導入体として、これをガラスフリット2によって発光管5に封止・固定した構造や、図5に示されるような、電極芯4に導電性サ−メットエンドディスク6を接続したものを電気導入体として用いた構造を採用することで行われている。なお、ここで用いられるガラスフリットとしては、例えば、アルミナ、酸化ケイ素、酸化ディスプロシウムを主成分にしたものや、アルミナ、酸化カルシウムを主成分にしたものが使われている。 When a ceramic tube is used as the arc tube, the sealing is performed by connecting an end disk connected to the electrode core 4 and the molybdenum wire 3 and the niobium wire 1 connected by welding or the like as shown in FIG. As an electrical introduction body, a structure in which this is sealed and fixed to the arc tube 5 by the glass frit 2 or a conductive cermet end disk 6 connected to the electrode core 4 as shown in FIG. It is done by adopting the structure that was. As the glass frit used here, for example, a glass frit containing alumina, silicon oxide or dysprosium as a main component or a glass frit containing alumina or calcium oxide as a main component is used.

このようなメタルハライドランプは、図6に示されるような、発光管8両端の電気導入体にニッケルなどの材質からなる線材10や板材7が接続され、これが外球枠13などに接続されて発光管8が外球9内に固定された構造を有している。 In such a metal halide lamp, as shown in FIG. 6, the wire 10 and the plate 7 made of a material such as nickel are connected to the electrical introduction bodies at both ends of the arc tube 8, and this is connected to the outer bulb frame 13 or the like to emit light. The tube 8 has a structure fixed in the outer sphere 9.

上記のような従来の構造のままで150Wより大きな中・高ワットのランプを作製すると、150W以下の低ワットランプでは生じなかった、発光管封止部でのクラックの発生やランプ特性の劣化といったような問題が生じることがわかった。これは、低ワットランプと比較してランプ点灯中の発熱量が多いために封止部温度が高くなることが原因と考えられ、これによって封止部で熱応力によりクラックが発生したり、ガラスフリットが封入物と化学反応を起こし、ランプ特性の劣化を招いたりするものと考えられる。 When a medium / high watt lamp larger than 150 W is manufactured with the conventional structure as described above, cracks in the arc tube sealing portion and deterioration of the lamp characteristics, which did not occur with a low watt lamp of 150 W or less, are caused. It was found that such a problem occurred. This is thought to be due to the fact that the temperature of the sealing part increases because of the large amount of heat generated during lamp operation compared to the low wattage lamp. It is considered that the frit causes a chemical reaction with the encapsulated material and causes deterioration of the lamp characteristics.

そこで、このような不具合が起こらないように封止部温度を下げる手段として、封止部をア−ク放電領域から遠ざける方法、発光管の肉厚を厚くして熱容量を増加させる方法などが考えられる。 Therefore, as a means for lowering the temperature of the sealing portion so that such a problem does not occur, a method of moving the sealing portion away from the arc discharge region, a method of increasing the heat capacity by increasing the thickness of the arc tube, etc. are considered. It is done.

しかしながら、このような方法を用いた場合には、発光管寸法が大きくなることや、発光管の材料コストが上がるといったような新たな問題が生じてしまう。 However, when such a method is used, new problems such as an increase in the size of the arc tube and an increase in the material cost of the arc tube arise.

以上に鑑み、本願発明は、セラミック管を発光管として用いた放電灯において、放電灯の出力を大きくした場合にも、発光管寸法の増大や発光管材料コストの増大を招くことなく、上記のような封止部でのクラックの発生やランプ特性の劣化を生じることのない放電灯構造を提供することを目的とする。 In view of the above, the present invention provides a discharge lamp using a ceramic tube as an arc tube, and does not cause an increase in arc tube dimensions or an increase in arc tube material cost even when the output of the discharge lamp is increased. It is an object of the present invention to provide a discharge lamp structure that does not cause cracks in the sealing portion or deteriorate lamp characteristics.

本願発明の放電灯は、セラミック管の内部に少なくともハロゲン化金属、水銀及び不活性ガスが封入され、セラミック管両端部にセラミック管と導通線との隙間に封口材が充填された封止部を有する発光管が支持枠によって外球内に組み込まれてなる放電灯であって、発光管両端の封止部に放熱部材が設けられていることを特徴とするものである。 In the discharge lamp of the present invention, at least a metal halide, mercury, and an inert gas are sealed inside the ceramic tube, and sealing portions in which a sealing material is filled in a gap between the ceramic tube and the conducting wire are provided at both ends of the ceramic tube. A discharge lamp in which an arc tube is incorporated in an outer sphere by a support frame, and a heat radiation member is provided at a sealing portion at both ends of the arc tube.

放熱部材を発光管両端の封止部に設けることにより、発光管両端の熱が放熱部材を介して放熱されて封止部の温度上昇が抑制される。放熱部材からの放熱は熱伝導によっても良いし熱輻射によっても良く、放熱部材の材料は放熱方法に応じて適宜選択する。 By providing the heat dissipating members at the sealing portions at both ends of the arc tube, the heat at both ends of the arc tube is dissipated through the heat dissipating member, and the temperature rise of the sealing portion is suppressed. The heat radiation from the heat radiating member may be by heat conduction or heat radiation, and the material of the heat radiating member is appropriately selected according to the heat radiating method.

特に、発光管両端部からの熱を熱伝導により放熱部材に伝え、これを放熱部材から放熱するようにする場合には、金属板または金属線からなる放熱部材を発光管端部に密着させて巻き付ける等の方法によりできるだけ密着させるのが良く、この際、その材質はできるだけセラミック管の熱膨張率に近い熱膨張率を有する材質を用いるのが良い。 In particular, when transferring heat from both ends of the arc tube to the heat radiating member by heat conduction and dissipating it from the heat radiating member, a heat radiating member made of a metal plate or metal wire is brought into close contact with the end of the arc tube. It is good to make it adhere as much as possible by a method such as winding. At this time, it is preferable to use a material having a thermal expansion coefficient as close as possible to that of the ceramic tube.

放熱部材を取り付ける場合には、封止部の温度上昇を抑制するという目的から、その取付位置は、発光管端部の封止部かこれに近い位置が良く、特に封止部に取り付けるようにするのがよい。このように、封止部の熱を効果的に放熱させるために、放熱部材は封口材が充填された封止部に設けるのが好ましい。 When attaching a heat radiating member, for the purpose of suppressing the temperature rise of the sealing portion, the mounting position is preferably the sealing portion at the end of the arc tube or a position close to this, and particularly attached to the sealing portion. It is good to do. Thus, in order to effectively dissipate the heat of the sealing portion, it is preferable that the heat dissipation member is provided in the sealing portion filled with the sealing material.

放熱部材からの放熱を熱伝導によって行う場合には、放熱部材を発光管への電力供給の役割を兼ねた発光管の支持枠に接続するのが良く、これにより、支持枠を伝って放電灯外部へ熱が放散される。 When heat radiation from the heat radiating member is performed by heat conduction, it is preferable to connect the heat radiating member to the arc tube support frame that also serves to supply power to the arc tube, and thus the discharge lamp travels along the support frame. Heat is dissipated to the outside.

また、発光管端部に放熱部材を取り付け、放熱部材を支持枠に接続することによって、放熱部材によって発光管を支持枠に固定するようにするのが好ましく、このようにすることによって、発光管端部の対振強度を高めることができる。特に、このような固定構造は、発光管がその両端に細径部を有しており、細径部に封止部が設けられている構造の発光管の固定構造として適しており、放電灯の振動に対して、細径部、特に、細径部の根本での破損が抑制される。なお、この場合には、放熱部材は発光管の端部となる細径部に取り付けられることになり、また、固定する必要があるため、放電部材の接続は放熱のみを行う場合よりも固定強度を大きくする。 In addition, it is preferable to fix the arc tube to the support frame by the heat dissipation member by attaching the heat dissipation member to the end of the arc tube and connecting the heat dissipation member to the support frame. The vibration strength at the end can be increased. In particular, such a fixing structure is suitable as an arc tube fixing structure in which the arc tube has narrow diameter portions at both ends and a sealing portion is provided at the narrow diameter portion. With respect to the vibration, the damage at the root of the narrow diameter portion, particularly the narrow diameter portion is suppressed. In this case, since the heat radiating member is attached to the small diameter part which becomes the end of the arc tube, and it is necessary to fix it, the connection of the discharge member is fixed strength than the case where only heat radiation is performed. Increase

本願発明によれば、放熱部材を設けることにより、封止部温度を下げることができ、封止部クラックの発生と、封入物とガラスフリットとの化学反応が抑制される。そして、これにより、ランプ特性の劣化を生じることがなくなり、放電灯の出力を大きくして中・高ワット放電灯とした場合にも、発光管寸法の増大や発光管材料コストの増大を招くことがなく、低コストでの放電灯の製造が可能になる。 According to the present invention, by providing the heat dissipating member, the sealing portion temperature can be lowered, and the generation of the sealing portion crack and the chemical reaction between the encapsulated material and the glass frit are suppressed. As a result, there is no deterioration in lamp characteristics, and even when the output of the discharge lamp is increased to obtain a medium / high watt discharge lamp, the arc tube dimensions and the arc tube material cost are increased. This makes it possible to manufacture a discharge lamp at a low cost.

第1の実施形態の放電灯概略図。1 is a schematic view of a discharge lamp according to a first embodiment. 第2の実施形態の放電灯概略図。The discharge lamp schematic of 2nd Embodiment. 第3の実施形態の放電灯概略図。The discharge lamp schematic of 3rd Embodiment. 発光管の封止構造を示す図。The figure which shows the sealing structure of an arc_tube | light_emitting_tube. 発光管の封止構造を示す図。The figure which shows the sealing structure of an arc_tube | light_emitting_tube. 従来の放電灯概略図。Schematic diagram of a conventional discharge lamp.

以下、本発明を実施形態に基づき説明する。 Hereinafter, the present invention will be described based on embodiments.

本発明の第一の実施形態にかかる放電灯概略図を図1に示す。発光管8本体は透光性アルミナ管から成り、中央部の最大外径は18mmで両端の細管部外径は4mmである。中央部長は30mmで細管部長は共に15mmである。発光管8内には封入物として、沃化ディスプロシウム、沃化ホルミウム、沃化ツリウムが合計12mgと沃化タリウム2mg、沃化ナトリウム2mg、水銀14mg及びアルゴンガスが13.3kPa封入されている。発光管8の両端部には2つの電極に給電する線径0.75mmのニオブ線が接続されている。アルミナ管の細径部とニオブ線との隙間にはアルミナ、酸化ケイ素、酸化ディスプロシウムを主成分とするガラスフリットからなる封口材が溶融充填されている。発光管8両端の封止部には、幅2mm、厚み0.2mmのニオブ板11が密着して巻かれ、このニオブ板11は外球の支持枠13に固定されている。外球9内雰囲気は、窒素等の希ガスで置換することもできるが、本実施形態では真空に引かれている。 A schematic diagram of a discharge lamp according to a first embodiment of the present invention is shown in FIG. The arc tube 8 main body is made of a translucent alumina tube, the maximum outer diameter of the central portion is 18 mm, and the outer diameters of the thin tube portions at both ends are 4 mm. The central part length is 30 mm and the narrow tube part length is 15 mm. The arc tube 8 is filled with 12 mg of dysprosium iodide, holmium iodide, and thulium iodide, 2 mg of thallium iodide, 2 mg of sodium iodide, 14 mg of mercury, and 13.3 kPa of argon gas. . Both ends of the arc tube 8 are connected to niobium wires having a wire diameter of 0.75 mm for supplying power to the two electrodes. A gap between the narrow diameter portion of the alumina tube and the niobium wire is melt-filled with a sealing material made of glass frit mainly composed of alumina, silicon oxide, and dysprosium oxide. A niobium plate 11 having a width of 2 mm and a thickness of 0.2 mm is tightly wound around the sealing portions at both ends of the arc tube 8, and the niobium plate 11 is fixed to a support frame 13 of an outer sphere. The atmosphere in the outer sphere 9 can be replaced with a rare gas such as nitrogen, but is evacuated in this embodiment.

ランプ点灯中ア−ク放電により発生した熱は電極芯から伝導されるのと同時に、発光管の管壁から伝導され封止部の温度を上昇させる。本発明による組立方法の場合、封止部に伝導された熱は封止部に巻かれた金属板を通じて外球枠に伝導される。したがって、封止部温度の上昇は抑制され、熱応力による封止部クラックを防止できる。尚、封止部温度は金属板の材質或いは幅、厚み寸法によりコントロ−ルすることができるので、ランプの電力により金属板を任意に調整することにより、最適な封止部温度が得られる。 The heat generated by the arc discharge during lamp operation is conducted from the electrode core and at the same time is conducted from the tube wall of the arc tube to raise the temperature of the sealing portion. In the assembly method according to the present invention, the heat conducted to the sealing portion is conducted to the outer sphere frame through the metal plate wound around the sealing portion. Therefore, an increase in the sealing portion temperature is suppressed, and a sealing portion crack due to thermal stress can be prevented. Since the sealing portion temperature can be controlled by the material, width, and thickness of the metal plate, the optimum sealing portion temperature can be obtained by arbitrarily adjusting the metal plate with the power of the lamp.

本発明の第二の実施形態にかかる放電灯概略図を図2に示す。本実施例では発光管8の細管部長がそれぞれ異なり、一方が10mmでもう一方が15mmである。細管部長が1mmの封止部には幅3mm、厚み0.2mmのニオブ板11'が、細管部長15mmの封止部には幅2mm、厚み0.2mmのニオブ板11がそれぞれ密着して巻かれ外球枠13に固定されている。それ以外は第一の実施例と同一である。このように細管部長が左右で異なる場合には、封止部に巻く金属板の寸法を変えることで左右の封止部温度をほぼ等しくすることができる。この方法はランプの寸法を小さくする場合に有効である。 A schematic diagram of a discharge lamp according to the second embodiment of the present invention is shown in FIG. In this embodiment, the lengths of the thin tube portions of the arc tube 8 are different, one being 10 mm and the other being 15 mm. A niobium plate 11 ′ having a width of 3 mm and a thickness of 0.2 mm is attached to the sealing portion having a thin tube portion length of 1 mm, and a niobium plate 11 having a width of 2 mm and a thickness of 0.2 mm is closely attached to the sealing portion having a thin tube portion length of 15 mm. It is fixed to the outer ball frame 13. The rest is the same as the first embodiment. As described above, when the lengths of the thin tube portions are different on the left and right, the temperature of the left and right sealing portions can be made substantially equal by changing the dimensions of the metal plate wound around the sealing portion. This method is effective for reducing the size of the lamp.

このようにして試作したランプを定格電力400Wで点灯試験を行った。その結果、6000時間経過後も安定に点灯でき、封止部にクラックなどの異常は見られなかった。またランプ光束は初期の80%以上であり、このことから封入物とロウ材の化学反応は起こっていないと判断できた。 The lamp thus produced was tested for lighting at a rated power of 400W. As a result, it was possible to light stably even after 6000 hours had elapsed, and no abnormality such as a crack was observed in the sealed portion. Further, the luminous flux of the lamp was 80% or more of the initial value. From this, it was determined that no chemical reaction between the encapsulated material and the brazing material occurred.

なお、上記第1および第2の実施形態では、放熱部材を支持枠に接続することによって、放熱部材によって発光管を支持枠に固定するようにしているため、発光管端部の対振強度が高められ、放電灯の振動に対して、細径部の根本での破損が従来のものに比べ少なかった。 In the first and second embodiments, since the arc tube is fixed to the support frame by the heat dissipation member by connecting the heat dissipation member to the support frame, the vibration strength at the end of the arc tube is high. As a result, there was less damage at the root of the narrow-diameter portion than the conventional one against vibration of the discharge lamp.

本発明の第3の実施形態に係る放電灯概略図を図3に示す。本実施例のランプは、放熱部材であるニオブ板12が支持枠に固定されていない点が第1の実施例のランプと異なる。本実施例の場合、ニオブ板12からの熱の放散は主として輻射によって行われる。なお、上記実施形態では発光管両端部に設ける放熱部材としてニオブ板を用いたが、その材質としては、アルミナ管等、セラミック発光管と熱膨張係数が近似したニオブまたはタンタルが最も好ましいのであるが、これ以外の材質を用いることもでき、例えば、その他の材質としてはニッケル、モリブデン、タングステン、ステンレスが適している。また、その形状や形態も種々の形状、形態を用いることができる。 A schematic diagram of a discharge lamp according to a third embodiment of the present invention is shown in FIG. The lamp of this embodiment is different from the lamp of the first embodiment in that the niobium plate 12 that is a heat radiating member is not fixed to the support frame. In the present embodiment, heat dissipation from the niobium plate 12 is mainly performed by radiation. In the above embodiment, a niobium plate is used as a heat dissipating member provided at both ends of the arc tube. However, as the material, niobium or tantalum having a thermal expansion coefficient approximate to that of a ceramic arc tube, such as an alumina tube, is most preferable. Other materials can also be used. For example, nickel, molybdenum, tungsten, and stainless steel are suitable as other materials. Moreover, the shape and form can also use various shapes and forms.

また、上記実施形態ではセラミック管材として、アルミナを使用したものを示したが、これ以外にも窒化アルミニウム、イットリウム酸化物等種々のものを用いることができる。また、封口材についても、ガラスフリット以外にもセラミックフリット等種々のものを用いることができる。 Moreover, although the thing using an alumina was shown as a ceramic pipe material in the said embodiment, various things, such as aluminum nitride and an yttrium oxide, can be used besides this. As the sealing material, various materials such as a ceramic frit can be used in addition to the glass frit.

1 ニオブ線
2 ガラスフリット
3 モリブデン線
4 電極芯
5 発光管
6 サ−メットエンドディスク
8 発光管
9 外球
11、11'、12 ニオブ板
DESCRIPTION OF SYMBOLS 1 Niobium wire 2 Glass frit 3 Molybdenum wire 4 Electrode core 5 Arc tube 6 Cermet end disk 8 Arc tube 9 Outer sphere 11, 11 ', 12 Niobium plate

Claims (2)

セラミック管の内部に少なくともハロゲン化金属、水銀及び不活性ガスが封入され、セラミック管両端部にセラミック管と導通線との隙間に封口材が充填された封止部を有する発光管が支持枠によって外球内に組み込まれてなる放電灯であって、発光管両端の前記封止部に放熱部材が設けられていることを特徴とする放電灯。 An arc tube having a sealing portion in which at least a metal halide, mercury, and an inert gas are sealed inside the ceramic tube, and a sealing material in which a sealing material is filled in a gap between the ceramic tube and the conducting wire at both ends of the ceramic tube is supported by a support frame. A discharge lamp built in an outer sphere, wherein a heat radiating member is provided at the sealing portions at both ends of the arc tube. セラミック管の内部に少なくともハロゲン化金属、水銀及び不活性ガスが封入され、セラミック管両端部にセラミック管と導通線との隙間に封口材が充填された封止部を有する発光管が支持枠によって外球内に組み込まれてなる放電灯であって、発光管両端部に放熱部材が設けられ、前記放熱部材が支持枠に接続され、前記放熱部材によって前記発光管が前記支持枠に固定されていることを特徴とする放電灯。 An arc tube having a sealing portion in which at least a metal halide, mercury, and an inert gas are sealed inside the ceramic tube, and a sealing material in which a sealing material is filled in a gap between the ceramic tube and the conducting wire at both ends of the ceramic tube is supported by a support frame. A discharge lamp built in an outer sphere, wherein heat radiation members are provided at both ends of the arc tube, the heat radiation member is connected to a support frame, and the arc tube is fixed to the support frame by the heat radiation member. A discharge lamp characterized by being.
JP2010152648A 2010-07-05 2010-07-05 Discharge lamp Pending JP2010251334A (en)

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JP2000030663A (en) * 1998-06-24 2000-01-28 Osram Sylvania Inc Arc tube for discharge lamp
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS484299Y1 (en) * 1968-04-09 1973-02-02
JPS49103482A (en) * 1973-02-06 1974-09-30
JPS52149883A (en) * 1976-06-08 1977-12-13 Mitsubishi Electric Corp Alkaline-metal-vapor discharge lamp
JPS556728A (en) * 1978-06-30 1980-01-18 Toshiba Corp Metal vapor discharge lamp
JPS5654749A (en) * 1979-10-09 1981-05-14 Matsushita Electric Works Ltd High pressure discharge lamp
JPS59191255A (en) * 1983-04-15 1984-10-30 Mitsubishi Electric Corp Metal vapor discharge lamp
JPS6433846A (en) * 1987-07-29 1989-02-03 Hitachi Ltd Metal vapor discharge lamp
JPH01149359A (en) * 1987-11-03 1989-06-12 Philips Gloeilampenfab:Nv High voltage sodium discharge lamp
JPH10500533A (en) * 1995-03-09 1998-01-13 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ High pressure discharge lamp
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JPH10149800A (en) * 1996-11-19 1998-06-02 Toshiba Lighting & Technol Corp Ceramics discharge lamp, lamp device, lighting device and liquid crystal projector
JPH10188901A (en) * 1996-12-26 1998-07-21 Ushio Inc Ceramic discharge lamp
JPH10294085A (en) * 1997-04-18 1998-11-04 Matsushita Electron Corp Matal halide lamp
JPH11283568A (en) * 1998-03-27 1999-10-15 Ngk Insulators Ltd Emission vessel for high-pressure discharge lamp
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JP2000030663A (en) * 1998-06-24 2000-01-28 Osram Sylvania Inc Arc tube for discharge lamp
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JP4879383B2 (en) * 2000-05-26 2012-02-22 株式会社Gsユアサ Discharge lamp

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