JPH06163008A - Rare gas discharge lamp - Google Patents

Rare gas discharge lamp

Info

Publication number
JPH06163008A
JPH06163008A JP15773493A JP15773493A JPH06163008A JP H06163008 A JPH06163008 A JP H06163008A JP 15773493 A JP15773493 A JP 15773493A JP 15773493 A JP15773493 A JP 15773493A JP H06163008 A JPH06163008 A JP H06163008A
Authority
JP
Japan
Prior art keywords
slit portion
width
bulb
positive column
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP15773493A
Other languages
Japanese (ja)
Inventor
Yoshinori Sato
佐藤嘉典
Ryoji Yoshiike
吉池良次
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Lighting and Technology Corp
Original Assignee
Toshiba Lighting and Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Priority to JP15773493A priority Critical patent/JPH06163008A/en
Publication of JPH06163008A publication Critical patent/JPH06163008A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To make light distributing characteristic uniform by forming a slit portion by means of a phosphor coating, lessen the width of an external electrode than the slit portion, and lessen the meandering width of a positive column so as not to bulge out of the width of the slit portion. CONSTITUTION:A phosphor coating 2 having a slit portion 7 and a pair of internal electrodes 3a, 3b are provided inside a tubular bulb 1, and rare gas is filled thereinto. Outside the bulb 1 an external electrode 5 for drawing a positive column A to its bulb wall, and the width of the electrode 5 is formed so as to be narrower than the width of the slit portion 7. When high frequency power is applied to the electrodes 3a, 3b, the coating 2 is excited by a ultra-violet wave emitted from the positive column A so that light is emitted from the slit portion 7. Although the positive column A is drawn to the electrode 5 during its lighting, the meandering width of the positive column A becomes narrow so as not to be allowed to bulge out of the width of the slit portion 7 as the width of the electrode 5 is narrow. The slit portion 7 is formed of the coating 2 so that light distributing characteristic in an axis direction can be uniformed without forming the coating specially.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、バルブの内部に希ガス
を封入し、このバルブにスリット部を有するけい光体被
膜を形成した希ガス放電灯に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rare gas discharge lamp in which a rare gas is enclosed in a bulb and a phosphor coating having a slit portion is formed on the bulb.

【0002】[0002]

【従来の技術】希ガス放電灯では、バルブの内面にけい
光体被膜を形成するとともに、このバルブの内部にキセ
ノン、クリプトン、アルゴン、ネオン、ヘリウム等の少
なくとも1種からなる希ガスを封入してあり、バルブ内
部でグロー放電が発生すると、陽光柱が発する紫外線に
よりけい光体が励起されて可視光を発するものである。
この種の希ガス放電灯は、水銀を使用しないことから、
水銀の温度依存性、つまりバルブ温度により水銀上気圧
が左右されることがなく、バルブ温度がランプ効率に影
響を及ぼすというような不具合がない。
2. Description of the Related Art In a rare gas discharge lamp, a phosphor coating is formed on the inner surface of a bulb, and a rare gas made of at least one of xenon, krypton, argon, neon, helium, etc. is enclosed in the bulb. When glow discharge occurs inside the bulb, the phosphor is excited by the ultraviolet rays emitted from the positive column to emit visible light.
Since this type of rare gas discharge lamp does not use mercury,
The temperature dependence of mercury, that is, the upper pressure of mercury does not depend on the bulb temperature, and there is no problem that the bulb temperature affects the lamp efficiency.

【0003】[0003]

【発明が解決しようとする課題】ところで、この種の希
ガス放電灯は、ファクシミリや複写機等のOA関連機器
にや表示用光源として使用されることが多く、この場
合、発光長さを長くして照射領域を大きくするととも
に、照射方向を規制することによって被照射面の照度を
上げることが要求される。このためには、バルブの軸方
向に伸びるスリット部を残して遮光被膜を形成するか、
またはバルブの内面に同じく軸方向に伸びるスリット部
を残して反射被膜を塗布するなどの手段で構成すること
ができる。しかしながら、上記手段では、スリット部の
形成のために特別に被膜を形成する必要があり、作業性
やコスト等の低下を招いている。
By the way, this kind of rare gas discharge lamp is often used in OA-related equipment such as facsimiles and copying machines and as a light source for display, and in this case, the emission length is long. Therefore, it is required to increase the illumination area and increase the illuminance of the illuminated surface by regulating the illumination direction. For this purpose, a light-shielding film is formed by leaving a slit portion extending in the axial direction of the bulb, or
Alternatively, the reflective film may be applied to the inner surface of the bulb while leaving a slit portion that also extends in the axial direction. However, in the above means, it is necessary to form a special coating for forming the slit portion, which leads to a reduction in workability and cost.

【0004】また、第5図ないし第7図に示された上記
希ガス放電灯では、点灯中の陽光柱は外部電極5側に引
き寄せられて管壁に近づけられるが、外部電極5の幅が
大きいと、陽光柱Aは第7図に示すように蛇行すること
がある。すなわち、外部電極5により陽光柱Aを引き寄
せる場合、外部電極5の幅が大きいと、この外部電極5
に引寄せられる陽光柱Aは、第6図の実線や破線または
1点鎖線で示すように外部電極5のどこに引寄せられる
か定まらず、引寄せられる位置が不揃いとなるため陽光
柱Aは第7図に示すように蛇行する。したがって、陽光
柱Aの蛇行幅が大きいと、遮光被膜6ないし反射被膜6
で形成されたスリット部7の幅から大きくはみ出し、ス
リット部7の反対側のけい光体被膜2においてスリット
部7の幅から大きくはみ出した位置のけい光体被膜2を
強く発光させることになり、強く発光する光がスリット
部7から放出されなくなるので、第7図に示す通り、軸
方向の配光特性にばらつきを発生する不具合がある。
In the rare gas discharge lamp shown in FIGS. 5 to 7, the positive column during lighting is drawn to the side of the external electrode 5 and brought close to the tube wall, but the width of the external electrode 5 is small. When large, the positive column A may meander as shown in FIG. That is, when the positive electrode A is attracted by the external electrode 5, if the width of the external electrode 5 is large, this external electrode 5
The position of the positive column A that is attracted to the external electrode 5 is not determined as shown by the solid line, the broken line or the alternate long and short dash line in FIG. 6, and the positions where the positive column A is attracted are not uniform. It meanders as shown in FIG. Therefore, when the meandering width of the positive column A is large, the light-shielding coating 6 or the reflective coating 6
The width of the slit portion 7 formed in the above is largely protruded, and the phosphor coating 2 at a position largely protruded from the width of the slit portion 7 on the opposite side of the slit portion 7 is made to strongly emit light, Since the light that strongly emits is not emitted from the slit portion 7, there is a problem that variations occur in the light distribution characteristics in the axial direction, as shown in FIG.

【0005】本発明は、上記事情に鑑みなされたもので
あり、スリット部7から放出される光の強さが軸方向に
ばらつきを生じないようにした希ガス放電灯を提供する
ことを目的とするものである。
The present invention has been made in view of the above circumstances, and an object thereof is to provide a rare gas discharge lamp in which the intensity of light emitted from the slit portion 7 does not vary in the axial direction. To do.

【0006】[0006]

【課題を解決するための手段】本発明は、スリット部を
けい光体被膜で形成し、外部電極の幅を上記スリット部
の幅より小さくしたことを特徴とする。
The present invention is characterized in that the slit portion is formed of a phosphor coating and the width of the external electrode is smaller than the width of the slit portion.

【0007】[0007]

【作用】この構成によると、外部電極の幅が小さくなる
から陽光柱の蛇行幅も小さくなり、陽光柱がスリット部
の幅から大きくはみ出すことがなくなり、さらに、スリ
ット部がけい光体被膜によって形成されているので、特
別に被膜を形成することなくバルブの軸方向の配光特性
をほぼ均等化することができる。
According to this structure, since the width of the external electrode becomes smaller, the meandering width of the positive column also becomes smaller, the positive column does not largely protrude from the width of the slit portion, and the slit portion is formed by the phosphor coating. Therefore, the light distribution characteristics in the axial direction of the bulb can be substantially equalized without forming a special coating.

【0008】[0008]

【実施例】本発明の第1の実施例の希ガス放電灯を第1
図ないし第4図を参照して説明する。細長い中空棒状を
なすバルブ1は、石英または硬質あるいは軟質ガラスに
より形成されている。このバルブ1の内面には、スリッ
ト部7が形成されたけい光体被膜2が形成されており、
かつバルブ1内にはキセノン、クリプトン、アルゴン、
ネオン、ヘリウム等の少なくとも1種からなる希ガスが
封入されている。
First Embodiment A rare gas discharge lamp according to the first embodiment of the present invention is first described.
A description will be given with reference to FIGS. The bulb 1 having an elongated hollow rod shape is formed of quartz or hard or soft glass. On the inner surface of the bulb 1, a phosphor coating 2 having a slit portion 7 is formed,
And in the valve 1, xenon, krypton, argon,
A rare gas made of at least one kind such as neon and helium is enclosed.

【0009】バルブ1内には両端部に位置して互いに極
性が異なる一対の内部電極3a,3bが設けられてい
る。これら内部電極3a,3bは、例えばニッケルから
なり、バルブ1の端部を気密に貫通されたリード線4,
4に接続されている。そして、バルブ1の側壁外面には
軸方向に沿って、陽光柱をバルブ1の管壁に引寄せるた
めの帯状の外部電極5が設けられ、バルブ1のほぼ両端
間に亙って連続して配置されている。この外部電極5
は、導電性塗布膜よりなり、たとえば銅とカーボンをペ
ースト状にして塗布し、これを焼成することにより形成
されている。
Inside the bulb 1, there are provided a pair of internal electrodes 3a, 3b located at both ends and having different polarities. These internal electrodes 3a and 3b are made of, for example, nickel, and lead wires 4 that hermetically penetrate through the end portion of the bulb 1.
4 is connected. A strip-shaped external electrode 5 for attracting the positive column to the tube wall of the bulb 1 is provided on the outer surface of the side wall of the bulb 1 along the axial direction. It is arranged. This external electrode 5
Is made of a conductive coating film, and is formed, for example, by coating copper and carbon in a paste form and baking the paste.

【0010】上記内部電極3a,3bは、高周波電力発
生装置としての高周波インバータ8に接続され、この高
周波インバータ8は直流電源9に接続されている。そし
て、外部電極5は一方の内部電極3aと同極性となるよ
うにして高周波インバータ8に接続されている。
The internal electrodes 3a and 3b are connected to a high frequency inverter 8 as a high frequency power generator, and the high frequency inverter 8 is connected to a DC power source 9. The external electrode 5 is connected to the high frequency inverter 8 so as to have the same polarity as the one internal electrode 3a.

【0011】このような希ガス放電灯は、高周波インバ
ータ8を通じて内部電極3a,3b間に高周波電力を印
加すると、内部電極3a,3b間でグロー放電を発生す
る。このグロー放電は、バルブ1内の希ガスを励起し、
紫外線を発する。この紫外線はバルブ1内面に形成した
けい光体被膜2で可視光線に変換され、バルブ1のスリ
ット部7から外部に放出される。
In such a rare gas discharge lamp, when high frequency power is applied between the inner electrodes 3a and 3b through the high frequency inverter 8, glow discharge is generated between the inner electrodes 3a and 3b. This glow discharge excites the rare gas in the bulb 1,
Emits ultraviolet rays. This ultraviolet ray is converted into visible light by the phosphor coating 2 formed on the inner surface of the bulb 1, and emitted to the outside from the slit portion 7 of the bulb 1.

【0012】したがって、このような希ガス放電灯であ
れば、バルブ1が細長い棒状をなしているので発光長さ
の長い光源となり、かつ光はスリット部7のみから外部
に放出されるため照射方向が規制され、この照射方向の
光量が増大することになるから被照射面の照度を向上さ
せることができる。しかも、バルブ1の側壁外面に軸方
向に沿って帯状の外部電極5を設けたので、バルブ1内
で発生する陽光柱を第1図に符号Aで示すように、外部
電極5側に引き寄せ、管壁に近づけるためけい光体被膜
2が強く励起され、発光量が増す。このとき、外部電極
5はスリット部7と反対側の面に形成してあるので、陽
光柱の接近によりより強く発光するけい光体被膜2から
の光がその反対面側のスリット部7を通じて外部に放出
され、発光強度を増大させることができるものである。
なお、外部電極5の形成位置は、スリット部7と正反対
側の位置ということではなく、けい光体被膜2が形成さ
れている部分のバルブ1上であればよい。
Therefore, in such a rare gas discharge lamp, since the bulb 1 has an elongated rod shape, it becomes a light source with a long light emission length, and since the light is emitted to the outside only from the slit portion 7, the irradiation direction. Is regulated and the amount of light in the irradiation direction is increased, so that the illuminance of the surface to be irradiated can be improved. Moreover, since the strip-shaped external electrode 5 is provided on the outer surface of the side wall of the bulb 1 along the axial direction, the positive column generated in the bulb 1 is attracted to the side of the external electrode 5 as shown by the symbol A in FIG. The phosphor coating 2 is strongly excited to approach the tube wall and the amount of light emission increases. At this time, since the external electrode 5 is formed on the surface on the side opposite to the slit portion 7, the light from the phosphor coating 2 that emits more intensely due to the approach of the positive column is exposed to the outside through the slit portion 7 on the opposite surface side. And is capable of increasing the emission intensity.
The formation position of the external electrode 5 is not limited to the position on the opposite side of the slit portion 7, but may be on the bulb 1 at the portion where the phosphor coating 2 is formed.

【0013】本実施例では、外部電極5の幅W1をけい
光体被膜2により形成したスリット部7の開口幅W2よ
り小さくしてある(W1≦W2)。具体例には、バルブ
1は内径dが4.8mm(外形は5.8mm)であり、
スリット部7の開口角度θは60°に設定されており、
したがって、スリット部7の開口幅W2は略3.0mm
に形成されている。外部電極5の幅W1は1.8mmと
してある。
In this embodiment, the width W1 of the external electrode 5 is made smaller than the opening width W2 of the slit portion 7 formed by the phosphor coating 2 (W1≤W2). In a specific example, the valve 1 has an inner diameter d of 4.8 mm (outer diameter is 5.8 mm),
The opening angle θ of the slit portion 7 is set to 60 °,
Therefore, the opening width W2 of the slit portion 7 is approximately 3.0 mm.
Is formed in. The width W1 of the external electrode 5 is 1.8 mm.

【0014】なお、陽光柱Aはできるだけ細くすること
が望ましく、陽光柱Aを細くするには、封入希ガスの封
入圧を高くする手段が採用される。例えば、封入ガス圧
を40Torr 以上にすれば陽光柱Aの太さを1mm以下
にすることができ、実際に使用する封入ガス圧は70T
orr 〜120Torr 程度であるから陽光柱Aの太さを充
分に細くすることができる。このため、陽光柱Aが蛇行
しても陽光柱Aの太さを無視することができる。
It is desirable to make the positive column A as thin as possible, and in order to thin the positive column A, means for increasing the filling pressure of the filled rare gas is adopted. For example, if the filled gas pressure is 40 Torr or more, the thickness of the positive column A can be set to 1 mm or less, and the actually used filled gas pressure is 70T.
Since it is about orr to 120 Torr, the thickness of the positive column A can be made sufficiently thin. Therefore, even if the positive column A meanders, the thickness of the positive column A can be ignored.

【0015】この構成によると、点灯中に陽光柱Aは外
部電極5側に引き寄せられて管壁に近づけられるが、こ
の際、外部電極5の幅が小さく形成されているため、陽
光柱Aの蛇行幅は第3図に示すように小さくなる。この
結果、陽光柱Aがスリット部7の幅から大きくはみ出す
ことはなくなり、また、陽光柱Aがスリット部7からは
みだした部分も、けい光体被膜2を透過して外部に放出
されるので、バルブ1の軸方向の配光特性をほぼ均等化
することができる。
According to this structure, the positive column A is attracted to the side of the external electrode 5 and brought close to the tube wall during lighting, but at this time, since the width of the external electrode 5 is formed small, The meandering width becomes smaller as shown in FIG. As a result, the positive column A does not largely protrude from the width of the slit part 7, and the part of the positive column A protruding from the slit part 7 is also transmitted to the outside through the phosphor coating 2. The light distribution characteristics of the bulb 1 in the axial direction can be substantially equalized.

【0016】次に、本発明の第2の実施例を第4図に示
す。すなわち、上記実施例では、バルブ1内に互いに極
性の異なる一対の内部電極3a,3bを封着し、バルブ
1の外側面に、陽光柱Aを管壁に引寄せるための帯状の
外部電極5を設けたが、本実施例では、他方の内部電極
3bを廃止し、これに代わって外部電極5を一方の内部
電極3aと極性が異なるようにして高周波インバータ8
に接続してある。
Next, a second embodiment of the present invention is shown in FIG. That is, in the above embodiment, a pair of internal electrodes 3a and 3b having different polarities are sealed in the bulb 1, and the outer surface of the bulb 1 has a strip-shaped outer electrode 5 for drawing the positive column A to the tube wall. However, in the present embodiment, the other internal electrode 3b is abolished and, instead of this, the external electrode 5 has a polarity different from that of the one internal electrode 3a, and the high frequency inverter 8 is provided.
Connected to.

【0017】この構成でも、内部電極3aと外部電極5
の間でグロー放電が生じ、しかも陽光柱Aを外部電極5
側に引き寄せることができる。また、バルブ内に封着す
る電極の数が少なくなり、封着構造の封着手間も省け
る。さらにまた、上記外部電極5はバルブ1の外面に軸
方向に沿って設けたため、内部電極3aとこれに対向す
るバルブ1の先端までの発光長さが得られ、上記バルブ
1の先端近傍のけい光体被膜2をも発光させることがで
きるので、バルブ1の長さに対する有効発光長さを長く
することができる。
Also in this structure, the internal electrode 3a and the external electrode 5 are
Glow discharge occurs between the positive electrode A and the external electrode 5
Can be drawn to the side. Further, the number of electrodes to be sealed in the bulb is reduced, and the sealing work of the sealing structure can be omitted. Furthermore, since the external electrode 5 is provided on the outer surface of the bulb 1 along the axial direction, a light emission length up to the tip of the bulb 1 facing the internal electrode 3a can be obtained, and the crystal near the tip of the bulb 1 is obtained. Since the photoconductor coating 2 can also emit light, the effective light emission length can be increased with respect to the length of the bulb 1.

【0018】[0018]

【発明の効果】本発明によると、スリット部をけい光体
被膜で形成し、外部電極の幅をスリット部の幅より小さ
くし、陽光柱の蛇行幅の小さくなりスリット部の開口幅
から大きくはみ出すことがなくなり、さらに、スリット
部がけい光体被膜によって形成されているので、特別に
被膜を形成することなくバルブの軸方向の配光特性をほ
ぼ均等化することができる。
According to the present invention, the slit portion is formed of the phosphor coating, the width of the external electrode is made smaller than the width of the slit portion, the meandering width of the positive column becomes small, and it largely protrudes from the opening width of the slit portion. Furthermore, since the slit portion is formed by the phosphor coating, the light distribution characteristics in the axial direction of the bulb can be substantially equalized without forming a coating.

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

【図1】本発明の第1実施例の希ガス放電灯のAA縦断
面図。
FIG. 1 is an AA vertical sectional view of a rare gas discharge lamp according to a first embodiment of the present invention.

【図2】本発明の第1実施例の希ガス放電灯のBB断面
図。
FIG. 2 is a BB sectional view of the rare gas discharge lamp of the first embodiment of the present invention.

【図3】本発明の希ガス放電灯の作動状態と配光特性を
示す説明図。
FIG. 3 is an explanatory diagram showing an operating state and a light distribution characteristic of the rare gas discharge lamp of the present invention.

【図4】本発明の第2実施例の希ガス放電灯の縦断面
図。
FIG. 4 is a vertical sectional view of a rare gas discharge lamp according to a second embodiment of the present invention.

【図5】従来の希ガス放電灯のCC縦断面図。FIG. 5 is a CC vertical sectional view of a conventional rare gas discharge lamp.

【図6】従来の希ガス放電灯のDD断面図。FIG. 6 is a DD cross-sectional view of a conventional rare gas discharge lamp.

【図7】従来の希ガス放電灯の作動状態と配光特性を示
す説明図。
FIG. 7 is an explanatory diagram showing an operating state and a light distribution characteristic of a conventional rare gas discharge lamp.

【符号の説明】[Explanation of symbols]

1…バルブ 2…けい光体被膜 3a,3b…内部電極 5…外部電極 7…スリット部 8…高周波インバータ 9…電源 11…スリット部 DESCRIPTION OF SYMBOLS 1 ... Valve 2 ... Fluorescent film 3a, 3b ... Internal electrode 5 ... External electrode 7 ... Slit part 8 ... High frequency inverter 9 ... Power supply 11 ... Slit part

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】内部に希ガスが封入された管状のバルブ
と;このバルブに形成され、バルブの軸方向に沿うスリ
ット部を有するけい光体被膜と;上記スリット部の反対
側の上記バルブの軸方向に沿って形成され、上記スリッ
ト部の幅よりも小さい幅を有し、陽光柱を上記バルブの
管壁に引寄せることのできる外部電極と;を具備してい
ることを特徴とする希ガス放電灯。
1. A tubular valve having a rare gas filled therein; a phosphor coating formed on the valve and having a slit portion along the axial direction of the valve; and a valve coating on the opposite side of the slit portion. An outer electrode formed along the axial direction, having a width smaller than the width of the slit portion, and capable of attracting the positive column to the tube wall of the bulb. Gas discharge lamp.
JP15773493A 1993-06-28 1993-06-28 Rare gas discharge lamp Pending JPH06163008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15773493A JPH06163008A (en) 1993-06-28 1993-06-28 Rare gas discharge lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15773493A JPH06163008A (en) 1993-06-28 1993-06-28 Rare gas discharge lamp

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP61203348A Division JPS6358752A (en) 1986-05-30 1986-08-29 Aperture type area gas discharge lamp

Publications (1)

Publication Number Publication Date
JPH06163008A true JPH06163008A (en) 1994-06-10

Family

ID=15656196

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15773493A Pending JPH06163008A (en) 1993-06-28 1993-06-28 Rare gas discharge lamp

Country Status (1)

Country Link
JP (1) JPH06163008A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6946794B2 (en) 2001-11-22 2005-09-20 Matsushita Electric Industrial Co., Ltd. Light source device and image reader
JP2007141766A (en) * 2005-11-22 2007-06-07 U-Tec Kk External electrode discharge lamp
US7633236B2 (en) 2006-03-31 2009-12-15 Ushio Denki Kabushiki Kaisha Lamp lighting apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62281256A (en) * 1986-05-30 1987-12-07 Toshiba Corp Rare gas discharge lamp device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62281256A (en) * 1986-05-30 1987-12-07 Toshiba Corp Rare gas discharge lamp device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6946794B2 (en) 2001-11-22 2005-09-20 Matsushita Electric Industrial Co., Ltd. Light source device and image reader
JP2007141766A (en) * 2005-11-22 2007-06-07 U-Tec Kk External electrode discharge lamp
JP4662358B2 (en) * 2005-11-22 2011-03-30 ユーテック株式会社 External electrode discharge lamp
US7633236B2 (en) 2006-03-31 2009-12-15 Ushio Denki Kabushiki Kaisha Lamp lighting apparatus

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