JPH01243362A - Small fluorescent lamp - Google Patents
Small fluorescent lampInfo
- Publication number
- JPH01243362A JPH01243362A JP63069301A JP6930188A JPH01243362A JP H01243362 A JPH01243362 A JP H01243362A JP 63069301 A JP63069301 A JP 63069301A JP 6930188 A JP6930188 A JP 6930188A JP H01243362 A JPH01243362 A JP H01243362A
- Authority
- JP
- Japan
- Prior art keywords
- filament
- filament electrode
- discharge
- electrodes
- electrode
- 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
Links
- 239000011521 glass Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000010891 electric arc Methods 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 4
- 230000005684 electric field Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 229910052753 mercury Inorganic materials 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- -1 zircon compound Chemical class 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は１発光管の内径が５＋ａｍ以下の小型蛍光ラン
プに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a compact fluorescent lamp in which the inner diameter of one arc tube is 5+am or less.
蛍光ランプは、各種の用途に幅広く使用されているが、
最近では、ポケットタイプの小型液晶テレビ画面のバッ
クライトや小型ファクシミリをはじめとして、小型機器
の照明用に小型蛍光ランプが盛んに使用されている。か
かる目的で使用される小型蛍光ランプは、小電力で点灯
することが必要で返るが、同時にランプを点灯状態にす
るに要する始動電圧が低くて点灯性も優れていることも
必要である。ところで、放電灯では、始動電圧を低くす
るために、補助始動手段として１発光管の外周面にトリ
ガー線が取り付けられる。熱陰極型の蛍光ランプに用い
られるトリガー線は、一方のフィラメント電極と電気的
に接続されて他方のフィラメント電極側に向かって伸び
るように発光管の外周面に配設されており、このトリガ
ー線を一方のフィラメント電極と同電位にし、他方のフ
ィラメント電極とトリガー線との間に電界を集中させ、
低い始動電圧でフィラメント電極とトリガー線との間に
放電電流が流れるようにするものである。そして、この
放電電流がトリガー（引き金）になって両電極間でグロ
ー放電が始まり、両電極間の放電抵抗が、例えば５〜Ｉ
ＯＫΩ程度まで低下してアーク放電に移行し、点灯する
。Fluorescent lamps are widely used for various purposes, but
Recently, small fluorescent lamps have been widely used for illuminating small devices such as backlights for pocket-type small LCD television screens and small facsimile machines. Compact fluorescent lamps used for such purposes need to be lit with low electric power, but at the same time they also need to have a low starting voltage required to turn on the lamp and have excellent lighting performance. By the way, in a discharge lamp, in order to lower the starting voltage, a trigger wire is attached to the outer peripheral surface of one arc tube as an auxiliary starting means. The trigger wire used in hot cathode fluorescent lamps is arranged on the outer circumferential surface of the arc tube so that it is electrically connected to one filament electrode and extends toward the other filament electrode. to the same potential as one filament electrode, and concentrate the electric field between the other filament electrode and the trigger wire,
This allows a discharge current to flow between the filament electrode and the trigger wire at a low starting voltage. Then, this discharge current becomes a trigger, and a glow discharge starts between both electrodes, and the discharge resistance between the two electrodes increases, for example, from 5 to I
The voltage decreases to about OKΩ, transitions to arc discharge, and lights up.
ところで、トリガー線とフィラメント電極の間には硬質
ガラスからなる発光管が介在するが、硬質ガラスは誘電
率が大きいので、フィラメント電極とトリガー線との間
に電界が集中しにくく、十分なトリガー効果を得ること
ができない、そして。By the way, an arc tube made of hard glass is interposed between the trigger wire and the filament electrode, but since hard glass has a high dielectric constant, it is difficult for the electric field to concentrate between the filament electrode and the trigger wire, and a sufficient trigger effect cannot be obtained. can't get , and.
従来の発光管の内径が５＋ａｍ以下の小型蛍光ランプで
は、始動電圧は２５０ｖ程度であるが、この始動電圧を
もっと低くして点灯性を向上させることが強く要請され
ている。In a conventional compact fluorescent lamp whose arc tube has an inner diameter of 5+ am or less, the starting voltage is about 250 V, but there is a strong demand for lowering this starting voltage to improve lighting performance.
そこで本発明は、簡単な構成で始動電圧を低下でき、点
灯性の優れた小型蛍光ランプを提供することを目的とす
る。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compact fluorescent lamp that can reduce the starting voltage with a simple configuration and has excellent lighting performance.
本発明の構成は、内径が５ｍｍ以下の発光管の両端がガ
ラスステムで封止され、ガラスステムの近傍に一対のフ
ィラメント電極が対向配置され、−方のフィラメント電
極と電気的に接続されて他方のフィラメント電極側に向
かって伸びるトリガー線が発光管の外周面に配設された
小型蛍光ランプにおいて、前記トリガー線は、他方のフ
ィラメント電極側において１発光管またはガラスステム
を貫通してフィラメント電極とは非接触状態で配設され
たビンと、アーク放電時の放電抵抗に比べて十分大きな
抵抗値を有する高抵抗物質を介して接続されたことを特
徴とする。The structure of the present invention is such that both ends of an arc tube with an inner diameter of 5 mm or less are sealed with glass stems, and a pair of filament electrodes are disposed opposite to each other near the glass stems, and electrically connected to one filament electrode and connected to the other filament electrode. In a compact fluorescent lamp in which a trigger wire extending toward the filament electrode side is disposed on the outer peripheral surface of the arc tube, the trigger wire passes through one arc tube or the glass stem on the other filament electrode side and connects to the filament electrode. is characterized in that it is connected to the vial disposed in a non-contact manner through a high-resistance material having a sufficiently large resistance value compared to the discharge resistance during arc discharge.
すなわち、トリガー線が発光管またはガラスステムを貫
通してフィラメント電極とは非接触状態で配設されたビ
ンと接続されているので、フィラメント電極とビンとの
間が極めて誘電されやすくなり、始動時に電界が効率良
く集中して放電するので、トリガー効果を上げることが
できる。そして、トリガー線とビンとの間にアーク放電
時の放電抵抗に比べて十分大きな抵抗値を有する高抵抗
物質が介在しているので１両フィラメント電極間の放電
抵抗が低下してアーク放電時の放電抵抗になると、フィ
ラメント電極とビンとの間の放電が停止して両フィラメ
ント電極間でアーク放電が始まり１点灯する。In other words, since the trigger wire passes through the arc tube or glass stem and is connected to the bottle, which is placed in a non-contact state with the filament electrode, dielectricity is extremely likely to be generated between the filament electrode and the bottle, which causes a problem during startup. Since the electric field is efficiently concentrated and discharged, the trigger effect can be increased. Since there is a high-resistance material between the trigger wire and the bottle that has a sufficiently larger resistance value than the discharge resistance during arc discharge, the discharge resistance between the two filament electrodes decreases and the discharge resistance during arc discharge decreases. When the discharge resistance is reached, the discharge between the filament electrode and the bottle stops and arc discharge begins between both filament electrodes, causing one light to be lit.
以下、図面に基いて本発明の実施例を具体的に説明する
。Embodiments of the present invention will be specifically described below based on the drawings.
第１図はフィラメント電極予熱タイプの熱陰極型小型蛍
光ランプを示すが、軟質ガラス製の発光管１は全長が８
０ｍ＋ｗ以下、内径が５ｍｍ以下の小型なものであり、
内壁面には蛍光体が塗布されている。この発光管１の両
端部にはガラスステム２が溶着されて封止されている。Figure 1 shows a hot cathode compact fluorescent lamp with filament electrode preheating type, and the arc tube 1 made of soft glass has a total length of 8.
It is small, with an inner diameter of 5 mm or less, and 0 m + w or less.
The inner wall surface is coated with phosphor. Glass stems 2 are welded to both ends of the arc tube 1 and sealed.
このガラスステム２にはニッケル線やコパール線などよ
りなる２本のリード線３が植立しているが、両リード線
３の間にフィラメント電極４１．４２が水平方向に保持
され、対向して配置されている。フィラメント電極４１
、４２は、タングステン、モリブデンなどの高融点金属
よりなり、シングルやダブルのコイル状であるが、この
フィラメント電極４１．４２に付着させる電子エミッタ
ーの材質としては、アルカリ金属やアルカリ土類金属の
酸化物もしくは炭酸塩、その他各種のものが使用される
１両端のフィラメント電極４１．４２は、直流で点灯す
る場合には、いずれか一方が熱陰極として機能し、交流
で点灯する場合は両方が熱陰極として機能する。フィシ
メン１〜電極４１．４２の下方のリード線３には水銀を
付着させたゲッター５が取付けられている。このゲッタ
ー５は、例えば、ニッケルめっきした鉄板に水銀やジル
コン化合物などを付着させたものであり、水銀を供給し
、かつ不純ガスを吸収する機能を果たす。Two lead wires 3 made of nickel wire, copper wire, etc. are planted on this glass stem 2, and filament electrodes 41 and 42 are held horizontally between both lead wires 3, and are placed facing each other. It is located. Filament electrode 41
, 42 are made of high-melting point metals such as tungsten and molybdenum, and are in the form of single or double coils.The electron emitters attached to the filament electrodes 41 and 42 are made of oxidized alkali metals or alkaline earth metals. The filament electrodes 41 and 42 at both ends, in which carbonate or carbonate or various other materials are used, function as a hot cathode when lit with direct current, and both act as a hot cathode when lit with alternating current. Functions as a cathode. A getter 5 to which mercury is attached is attached to the lead wire 3 below the ficimen 1 to the electrodes 41 and 42. The getter 5 is, for example, a nickel-plated iron plate to which mercury or a zircon compound is attached, and functions to supply mercury and absorb impure gases.
発光管１の外周面にはトリガー線６が軸線方向に設けら
れているが、トリガー線６の一端側は、一方のフィラメ
ント電極４１のリード線３に電気的に接続しており、ト
リガー線６の他端側は、高抵抗物質７の一端側に接続さ
れている。この高抵抗物質７は１例えばＲｕｂ、からな
り、ＩＭΩ程度の抵抗値を有する。すなわち、両フィラ
メント電極４１．４２間のアーク放電時の放電抵抗より
も十分に大きな抵抗値を有している。そして、高抵抗物
質７の他端側はピン８の一端側に接続されている。この
ピン８は、発光管１を気密に貫通しており、その先端８
１は他方のフィラメント電極４２に非接触状態で対峙し
ている。あるいは、第２図に示すように、ピン８がガラ
スステム２を気密に貫通して先端８１が他方のフィラメ
ント電極４ｚに非接触状態で対峙するようにしてもよい
０発光管１内には、例えば１〜２＋ｍｇ程度の微量の水
銀が封入され、また、１０〜５０ト一ル程度のアルゴン
、クリプトンもしくはネオンから選ばれたガス。A trigger wire 6 is provided in the axial direction on the outer peripheral surface of the arc tube 1, and one end of the trigger wire 6 is electrically connected to the lead wire 3 of one filament electrode 41. The other end is connected to one end of the high resistance material 7. This high-resistance material 7 is made of, for example, Rub, and has a resistance value of about IMΩ. That is, it has a resistance value that is sufficiently larger than the discharge resistance during arc discharge between both filament electrodes 41 and 42. The other end of the high-resistance material 7 is connected to one end of the pin 8 . This pin 8 passes through the arc tube 1 in an airtight manner, and its tip 8
1 faces the other filament electrode 42 in a non-contact state. Alternatively, as shown in FIG. 2, the pin 8 may hermetically penetrate the glass stem 2 so that the tip 81 faces the other filament electrode 4z in a non-contact state. For example, a trace amount of mercury of about 1 to 2+ mg is sealed, and a gas selected from argon, krypton, or neon of about 10 to 50 torr.
またはそれらの混合ガスが封入されている。Or a mixture of these gases is sealed.
次に実際に製作した小型蛍光ランプの一例を示す。Next, we will show an example of a compact fluorescent lamp that we actually manufactured.
発光管の全長 ７９ｍｍ
発光管の内径 ３．４１−
アーク長 ６５醜鵬
封入ガス アルゴン
封入ガス圧 ４０トール
水銀量 １．５ｍｇ
フィラメント タングステン
電子放射性物質 トリプルカーボネイトとジルコ
ニア化合物
高抵抗物質 Ｒｕ Ｏ。Total length of arc tube: 79 mm Inner diameter of arc tube: 3.41- Arc length: 65 Uho Filled gas Argon filled gas pressure: 40 Torr Mercury amount: 1.5 mg Filament Tungsten Electron radioactive material Triple carbonate and zirconia compound high resistance material Ru O.
高抵抗物質の抵抗値 ＩＭΩ
ランプ電圧 ７５Ｖ
ランプ電流 １４ｍＡ
ランプ電力 １．ＯＷ
しかして、両フィラメント電極４１．４２間に始動電圧
を印加すると、他方のフィラメント電極４２とピン８の
先端８１の間に電界が効率良く集中して放電する。そし
て、この放電がトリガーになって両フィラメント電極４
１．４２間がブレークダウンし、グロー放電が発生する
。これによって。Resistance value of high resistance material IMΩ Lamp voltage 75V Lamp current 14mA Lamp power 1. OW Thus, when a starting voltage is applied between both filament electrodes 41 and 42, an electric field is efficiently concentrated between the other filament electrode 42 and the tip 81 of the pin 8, causing a discharge. This discharge becomes a trigger and both filament electrodes 4
A breakdown occurs between 1.42 and glow discharge occurs. by this.
両フィラメント電極４１．４２間の放電抵抗が、例えば
５〜ＩＯＫΩ程度まで低下してアーク放電時の放電抵抗
になると、トリガー線６とピン８との間にアーク放電時
の放電抵抗に比べて十分大きな抵抗値を有する高抵抗物
質７が介在しているので、フィラメント電極４２とピン
８の先端８１との間の放電が停止して両フィラメント電
極４１．４２間でアーク放電が始まり、点灯する。When the discharge resistance between both filament electrodes 41 and 42 decreases to, for example, about 5 to IOKΩ and becomes the discharge resistance during arc discharge, there is a sufficient resistance between the trigger wire 6 and pin 8 compared to the discharge resistance during arc discharge. Since the high-resistance material 7 having a large resistance value is present, the discharge between the filament electrode 42 and the tip 81 of the pin 8 is stopped, and arc discharge is started between the filament electrodes 41 and 42, resulting in lighting.
このように、始動時に、他方のフィラメント電極４２と
ピン８の先端８１の間に電界が効率良く集中して放電す
るので、低い始動電圧で始動し。In this way, at the time of starting, the electric field is efficiently concentrated and discharged between the other filament electrode 42 and the tip 81 of the pin 8, so that the engine can be started with a low starting voltage.
点灯性は極めて向上する。因に、前記諸元の小型蛍光ラ
ンプの始動電圧は２３０Ｖであり、従来に比べて非常に
低い始動電圧で点灯できることを確認した。Lighting performance is greatly improved. Incidentally, the starting voltage of the compact fluorescent lamp with the above specifications is 230V, and it was confirmed that it can be lit with a much lower starting voltage than conventional lamps.
（発明の効果〕
以上説明したように、本発明の小型蛍光ランプは、トリ
ガー線が発光管またはガラスステムを貫通してフィラメ
ント電極とは非接触状態で配設されたピンと、アーク放
電時の放電抵抗に比べて十分大きな抵抗値を有する高抵
抗物質を介して接続されているので、ピンとフィラメン
ト電極との間で電界が効率良く集中し、トリガー効果が
向上する。従って、本発明によれば、簡単な構成で始動
電圧を低下でき１点灯性の優れた小型蛍光ランプとする
ことができる。(Effects of the Invention) As explained above, the compact fluorescent lamp of the present invention has a trigger wire that penetrates the arc tube or glass stem and is disposed in a state in which the trigger wire is not in contact with the filament electrode. Since the pins and the filament electrode are connected through a high-resistance material having a sufficiently large resistance value compared to the resistor, the electric field is efficiently concentrated between the pin and the filament electrode, and the triggering effect is improved.Therefore, according to the present invention, With a simple configuration, the starting voltage can be lowered, and a compact fluorescent lamp with excellent lighting performance can be obtained.
第１図は本発明実施例の断面図、第２図は他の実施例の
断面図である。
１・・・発光管 ２・・・ガラスステム３・・・
リード線 ４１．４２・・・フィラメント電極５・
・・ゲッター ６・・・トリガー線７・・・高抵抗
物質 ８・・・ビンFIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of another embodiment. 1... Arc tube 2... Glass stem 3...
Lead wire 41.42...Filament electrode 5.
...Getter 6...Trigger wire 7...High resistance material 8...Bin
Claims (1)
され、ガラスステムの近傍に一対のフィラメント電極が
対向配置され、一方のフィラメント電極と電気的に接続
されて他方のフィラメント電極側に向かって伸びるトリ
ガー線が発光管の外周面に配設された小型蛍光ランプに
おいて、 前記トリガー線は、他方のフィラメント電極側において
、発光管またはガラスステムを貫通してフィラメント電
極とは非接触状態で配設されたピンと、アーク放電時の
放電抵抗に比べて十分大きな抵抗値を有する高抵抗物質
を介して接続されたことを特徴とする小型蛍光ランプ。[Claims] Both ends of an arc tube with an inner diameter of 5 mm or less are sealed with a glass stem, and a pair of filament electrodes are arranged facing each other near the glass stem, and are electrically connected to one filament electrode and connected to the other filament electrode. In a compact fluorescent lamp in which a trigger wire extending toward the filament electrode is disposed on the outer peripheral surface of the arc tube, the trigger wire passes through the arc tube or the glass stem on the other filament electrode side and is connected to the filament electrode. A compact fluorescent lamp characterized in that a pin arranged in a non-contact state is connected via a high-resistance material having a sufficiently large resistance value compared to the discharge resistance during arc discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63069301A JPH01243362A (en) | 1988-03-25 | 1988-03-25 | Small fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63069301A JPH01243362A (en) | 1988-03-25 | 1988-03-25 | Small fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01243362A true JPH01243362A (en) | 1989-09-28 |
Family
ID=13398608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63069301A Pending JPH01243362A (en) | 1988-03-25 | 1988-03-25 | Small fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01243362A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007188903A (en) * | 2007-04-20 | 2007-07-26 | Matsushita Electric Ind Co Ltd | Metal halide lamp |
| JP2008034272A (en) * | 2006-07-31 | 2008-02-14 | Ushio Inc | External electrode type rare gas discharge lamp |
-
1988
- 1988-03-25 JP JP63069301A patent/JPH01243362A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008034272A (en) * | 2006-07-31 | 2008-02-14 | Ushio Inc | External electrode type rare gas discharge lamp |
| JP2007188903A (en) * | 2007-04-20 | 2007-07-26 | Matsushita Electric Ind Co Ltd | Metal halide lamp |
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