JP2000340173A - Short arc discharge lamp and light source device - Google Patents
Short arc discharge lamp and light source deviceInfo
- Publication number
- JP2000340173A JP2000340173A JP11149170A JP14917099A JP2000340173A JP 2000340173 A JP2000340173 A JP 2000340173A JP 11149170 A JP11149170 A JP 11149170A JP 14917099 A JP14917099 A JP 14917099A JP 2000340173 A JP2000340173 A JP 2000340173A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- light emitting
- tube
- arc tube
- short arc
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶プロジェクタ
等の光学機器のバックライトとして用いられるショート
アーク放電ランプに関し、特に外管なしで反射鏡と組み
合わせて水平点灯されるショートアーク放電ランプを用
いた光源装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short arc discharge lamp used as a backlight of an optical device such as a liquid crystal projector, and more particularly to a short arc discharge lamp which is horizontally lit in combination with a reflector without an outer tube. The present invention relates to a light source device.
【０００２】[0002]
【従来の技術】従来、液晶プロジェクタ等の光学機器の
バックライト用の光源としては、反射鏡と組み合わせた
場合に効率が上がるように電極間距離の短い、すなわち
アーク長の短いショートアーク放電ランプが使用されて
いる。液晶プロジェクタ等の光学機器のバックライト用
の光源として、ショートアークタイプの金属蒸気放電ラ
ンプが使用されてきたが、近年では特開平６−５２８３
０号公報の記載にあるような、更に高輝度、高効率、長
寿命であるショートアークタイプの高圧水銀蒸気放電ラ
ンプが、液晶プロジェクタ等の光学機器のバックライト
用光源として使用されてきている。2. Description of the Related Art Conventionally, as a light source for a backlight of an optical apparatus such as a liquid crystal projector, a short arc discharge lamp having a short distance between electrodes, that is, a short arc length is used so as to increase efficiency when combined with a reflector. It is used. A short arc type metal vapor discharge lamp has been used as a light source for a backlight of an optical device such as a liquid crystal projector.
A short arc type high pressure mercury vapor discharge lamp having higher brightness, higher efficiency, and longer life, as described in Japanese Patent Application Publication No. 0-203, has been used as a light source for a backlight of an optical device such as a liquid crystal projector.
【０００３】[0003]
【発明が解決しようとする課題】しかし、ショートアー
クタイプの放電ランプでは、アーク長が短いとランプ電
圧が設計値よりも低くなってしまうため、ランプ電流が
大きくなり電極の消耗が激しくなって、発光管内に電極
材料が付着し、ランプの光束低下の原因となってしま
う。However, in a short arc type discharge lamp, if the arc length is short, the lamp voltage becomes lower than a design value, so that the lamp current becomes large and the electrodes are consumed greatly. The electrode material adheres to the inside of the arc tube, causing a reduction in the luminous flux of the lamp.
【０００４】アーク長を短くしたまま、ランプ電圧を設
計値通りにするには、発光管の内径を小さくし、発光管
の最冷部温度を上昇させて動作圧力を高め、水銀を十分
に蒸発させる方法があるが、発光管内のガス対流によ
り、アークが上方に湾曲するため、発光管上部の温度が
上昇して、発光管上部壁面が結晶化（失透）を起こし、
ランプの光束低下の原因となってしまう。In order to keep the lamp voltage at the designed value while keeping the arc length short, the inside diameter of the arc tube is reduced, the operating temperature is increased by increasing the temperature of the coldest part of the arc tube, and mercury is sufficiently evaporated. There is a method of causing the arc to bend upward due to the gas convection in the arc tube, so that the temperature of the upper portion of the arc tube increases and the upper wall surface of the arc tube undergoes crystallization (devitrification),
This causes a reduction in the luminous flux of the lamp.
【０００５】本発明は、前記問題点を解決するためにな
されたもので、石英製発光管の発光部の寸法を規定する
ことにより、短アーク化による電極の消耗が少なく、発
光管上部壁面の結晶化を抑制して、光学特性の優れた、
高輝度、高効率、長寿命なショートアーク放電ランプお
よびそれを用いた光源装置を提供することを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. By defining the size of a light emitting portion of a quartz light emitting tube, electrode consumption due to a short arc is reduced and the upper wall surface of the light emitting tube is reduced. Suppress crystallization, excellent optical characteristics,
It is an object of the present invention to provide a short arc discharge lamp having high luminance, high efficiency, and long life, and a light source device using the same.
【０００６】[0006]
【課題を解決するための手段】上記問題点を解決するた
め、請求項１記載の発明は、両端に一対の電極を封着し
た石英製発光管内に、少なくとも水銀及び希ガスが封入
され、電極間距離が０．５〜２．５ｍｍで、水平点灯用
のショートアーク放電ランプにおいて、前記電極の軸か
ら前記石英製発光管の発光部の鉛直方向上側最大径部ま
での長さをＤ１、同じく前記石英製発光管の発光部の鉛
直方向下側最大径部までの長さをＤ２としたとき、１．
１≦Ｄ１／Ｄ２≦２．０とし、かつ発光部の管軸方向の
水平長さをＬとしたとき、２≦Ｌ／Ｄ２≦５と規定した
ことを特徴とするショートアーク放電ランプである。In order to solve the above-mentioned problems, according to the first aspect of the present invention, at least mercury and a rare gas are sealed in a quartz arc tube having a pair of electrodes sealed at both ends. In the short arc discharge lamp for horizontal lighting with a distance of 0.5 to 2.5 mm, the length from the axis of the electrode to the maximum diameter portion in the vertical direction of the light emitting portion of the quartz arc tube is D1, and When the length of the light emitting portion of the quartz arc tube to the vertically lower maximum diameter portion is D2,
A short arc discharge lamp characterized in that 2 ≦ L / D2 ≦ 5 when 1 ≦ D1 / D2 ≦ 2.0 and the horizontal length of the light emitting section in the tube axis direction is L.
【０００７】請求項２記載の発明は、前記発光管内に、
０．１５〜０．３０ｍｇ／ｍｍ3の水銀と、臭化物およ
び希ガスを封入したことを特徴とする請求項１記載のシ
ョートアーク放電ランプであり、請求項３記載の発明
は、前記発光管内に、０．０３〜０．１ｍｇ／ｍｍ3の
水銀と、金属ハロゲン化物および希ガスを封入したこと
を特徴とする請求項１記載のショートアーク放電ランプ
である。According to a second aspect of the present invention, in the arc tube,
And mercury 0.15~0.30mg / mm 3, a short arc discharge lamp of claim 1, wherein the encapsulating bromide and a rare gas, the invention of claim 3 is the light emitting tube 3. A short arc discharge lamp according to claim 1, wherein 0.03 to 0.1 mg / mm 3 of mercury, a metal halide and a rare gas are sealed.
【０００８】そして、請求項４記載の発明は、請求項１
乃至請求項３記載のショートアーク放電ランプと、略楕
円面、略放物面、あるいはそれらの組合せの形状からな
る反射鏡を有し、前記ショートアーク放電ランプが前記
反射鏡の端部に前記反射鏡の中心軸に沿って水平に、前
記ショートアーク放電ランプの電極の軸が配置されたこ
とを特徴とする光源装置である。[0008] The invention described in claim 4 is based on claim 1.
4. The short arc discharge lamp according to claim 3, further comprising a reflector having a substantially elliptical surface, a substantially parabolic surface, or a combination thereof, wherein the short arc discharge lamp reflects the light at an end of the reflector. A light source device, wherein an axis of an electrode of the short arc discharge lamp is arranged horizontally along a central axis of a mirror.
【０００９】請求項１記載の発明によれば、１．１≦Ｄ
１／Ｄ２≦２．０とすることにより、発光管上部壁面は
アーク中心から離れ、発光管の温度上昇による石英の結
晶化（失透）を抑制することができる。また、２≦Ｌ／
Ｄ２≦５とすることにより、発光部の管軸方向端部に最
冷部が形成されて発光管の最冷部温度を上昇させること
ができ、所望の動作圧力にすることができるうえ、発光
管の加工にも困難性を伴なわない。According to the first aspect of the present invention, 1.1 ≦ D
By setting 1 / D2 ≦ 2.0, the upper wall surface of the arc tube is separated from the arc center, and crystallization (devitrification) of quartz due to a rise in the temperature of the arc tube can be suppressed. Also, 2 ≦ L /
By setting D2 ≦ 5, the coolest part is formed at the end of the light emitting part in the tube axis direction, so that the temperature of the coolest part of the light emitting tube can be increased, and a desired operating pressure can be obtained. There is no difficulty in processing the pipe.
【００１０】請求項２記載の発明によれば、電極の消耗
が少なく、発光管上部壁面の結晶化を抑制して、光学特
性の優れた、高輝度、高効率、長寿命なショートアーク
高圧水銀蒸気放電ランプが得られる。また、請求項３記
載の発明によれば、電極の消耗が少なく、発光管上部壁
面の結晶化を抑制して、光学特性の優れた、高輝度、高
効率、長寿命なショートアーク金属蒸気放電ランプが得
られる。According to the second aspect of the present invention, the short arc high-pressure mercury which has less wear of the electrodes, suppresses crystallization of the upper wall surface of the arc tube, and has excellent optical characteristics, high brightness, high efficiency and long life. A vapor discharge lamp is obtained. Further, according to the third aspect of the present invention, the short arc metal vapor discharge with less wear of the electrodes, suppression of crystallization of the upper wall surface of the arc tube, excellent optical characteristics, high brightness, high efficiency, and long life. A lamp is obtained.
【００１１】そして、請求項４記載の発明によれば、請
求項１乃至請求項３記載のショートアーク放電ランプ
と、反射鏡とで構成される水平点灯用光源装置として用
いることにより、光学特性や寿命特性に優れた光源装置
が得られる。According to the fourth aspect of the present invention, by using the short arc discharge lamp according to any one of the first to third aspects as a light source device for horizontal lighting composed of a reflecting mirror, the optical characteristics and the like are improved. A light source device having excellent life characteristics can be obtained.
【００１２】[0012]
【発明の実施の形態】次に実施の形態について説明す
る。図１は本発明に係るショートアーク高圧水銀蒸気放
電ランプの一実施例を示す概略断面図である。石英製発
光管１の内部にはタングステンからなる一対の電極２
ａ、２ｂが電極間距離を１ｍｍとして発光部３に配置さ
れ、モリブデンからなる金属箔４ａ、４ｂを介して、前
記石英製発光管より外部に伸びる導線５ａ、５ｂに接続
されている。そして、石英製発光管１の内部には、水銀
が０．２ｍｇ／ｍｍ3の密度で封入され、始動用の希ガ
スとしてアルゴンが１３×１０3Ｐａ、臭化物として臭
化水素が２．５×１０-10ｍｏｌ／ｍｍ3の密度で封入さ
れている。Next, an embodiment will be described. FIG. 1 is a schematic sectional view showing one embodiment of a short arc high pressure mercury vapor discharge lamp according to the present invention. A pair of electrodes 2 made of tungsten are provided inside a quartz arc tube 1.
a and 2b are arranged in the light emitting section 3 with a distance between the electrodes of 1 mm, and are connected to conductive wires 5a and 5b extending outside from the quartz light emitting tube via metal foils 4a and 4b made of molybdenum. Mercury is sealed in the quartz arc tube 1 at a density of 0.2 mg / mm 3 , argon is 13 × 10 3 Pa as a rare gas for starting, and hydrogen bromide is 2.5 × 10 3 Pa as a bromide. It is sealed at a density of 10 −10 mol / mm 3 .
【００１３】発光部３の寸法は、電極の軸から前記発光
管１の発光部３の鉛直方向上側最大径部までの長さＤ１
が３ｍｍ、電極の軸から前記発光管１の発光部３の鉛直
方向下側最大径部までの長さＤ２が１．６ｍｍ、電極の
軸方向の長さＬが６ｍｍとなっている。そして、このよ
うに構成されたショートアーク高圧水銀蒸気放電ランプ
を、点灯電力１２０Ｗで点灯させたところ、ランプ電圧
は７０Ｖであり、点灯時間が１０００時間まで石英製発
光管１の結晶化は生じず、点灯１０００時間でのスクリ
ーン上の明るさは、初期値の８０％以上を維持してい
た。The size of the light emitting portion 3 is a length D1 from the axis of the electrode to the maximum diameter portion of the light emitting portion 3 in the vertical direction above the light emitting portion 3.
Is 3 mm, the length D2 from the axis of the electrode to the vertically lower maximum diameter portion of the light emitting portion 3 of the arc tube 1 is 1.6 mm, and the axial length L of the electrode is 6 mm. Then, when the short arc high pressure mercury vapor discharge lamp thus configured was lit at a lighting power of 120 W, the lamp voltage was 70 V, and crystallization of the quartz arc tube 1 did not occur until the lighting time was 1000 hours. The brightness on the screen after lighting for 1000 hours was maintained at 80% or more of the initial value.
【００１４】次に、発光部３の寸法Ｄ１およびＤ２を
２．３ｍｍ、発光部３の電極の軸方向の水平長さＬを６
ｍｍとして、ショートアーク高圧水銀蒸気放電ランプを
試作したところ、ランプ電圧は７０Ｖに達したが、点灯
１００時間で発光管１の結晶化が始まって発光管１が膨
らみ、結晶化の進行により、点灯１０００時間でスクリ
ーン上の明るさは初期の５０％に減っていた。Next, the dimensions D1 and D2 of the light emitting section 3 are 2.3 mm, and the horizontal length L of the electrodes of the light emitting section 3 in the axial direction is 6 mm.
mm, a short arc high pressure mercury vapor discharge lamp was prototyped, and the lamp voltage reached 70 V. However, in 100 hours of operation, crystallization of the arc tube 1 started, the arc tube 1 expanded, and the lamp was turned on by the progress of crystallization. At 1000 hours, the brightness on the screen had been reduced to 50% of the initial value.
【００１５】また、発光部３の寸法Ｄ１およびＤ２を３
ｍｍとし、発光部３の電極の軸方向の水平長さＬを６ｍ
ｍとして、ショートアーク高圧水銀蒸気放電ランプを試
作したところ、封入した水銀の全てが蒸発するまで発光
管下側の温度が上昇せず、ランプ電圧が５０Ｖ程度にし
かならず、点灯数十時間で飛散した電極物質により発光
管内壁が黒くなってしまった。The dimensions D1 and D2 of the light emitting section 3 are set to 3
mm, and the horizontal length L of the electrode of the light emitting section 3 in the axial direction is 6 m.
When a short arc high-pressure mercury vapor discharge lamp was prototyped as m, the temperature under the arc tube did not rise until all of the enclosed mercury was evaporated, the lamp voltage was only about 50 V, and scattered for several tens of hours. The inner wall of the arc tube was blackened by the electrode material.
【００１６】前記一実施例では、発光管の内径Ｄ１＋Ｄ
２を４．６ｍｍとしたが、Ｄ１を２．５〜３．５ｍｍ程
度、内径を５ｍｍ以下とするのが実用的である。そし
て、Ｄ１／Ｄ２が１．１未満であると、従来のショート
アーク放電ランプと変わらずに発光管上部壁面の結晶化
が起き、Ｄ１／Ｄ２が２．０よりも大きくなると、発光
部の温度勾配がずれてくるため、所望のランプ特性を得
られなくなってしまう。そして、Ｌ／Ｄ２＜２とする
と、発光管の加工が困難となって加工精度が悪くなるう
えに、電極の消耗が早くなり、５＜Ｌ／Ｄ２とすると、
発光部の管軸方向端部に最冷部が形成され、所望の動作
圧力が得られなくなってしまう。In the above embodiment, the inner diameter of the arc tube D1 + D
2 is 4.6 mm, but it is practical that D1 is about 2.5 to 3.5 mm and the inner diameter is 5 mm or less. When D1 / D2 is less than 1.1, crystallization of the upper wall surface of the arc tube occurs as in the conventional short arc discharge lamp, and when D1 / D2 becomes larger than 2.0, the temperature of the light emitting section becomes higher. Since the gradient is shifted, desired lamp characteristics cannot be obtained. If L / D2 <2, processing of the arc tube becomes difficult and processing accuracy deteriorates. In addition, electrode wear becomes faster, and if 5 <L / D2,
The coolest part is formed at the end of the light emitting part in the tube axis direction, and a desired operating pressure cannot be obtained.
【００１７】また、発光管内に０．１５〜０．３０ｍｇ
／ｍｍ3の水銀、臭化物および希ガスを封入するショー
トアーク放電ランプとしたのは、水銀量が０．１５ｍｇ
／ｍｍ3未満であると、水銀蒸気圧が低くなって可視光
領域の連続スペクトル強度が低くなり、所望の光学特性
やランプ特性が得られなくなるためであり、水銀量が
０．３０ｍｇ／ｍｍ3よりも大きくなると、発光管の内
圧が高くなりすぎて発光管が破裂する可能性が高くなっ
てしまうためである。Further, 0.15 to 0.30 mg is contained in the arc tube.
/ Mm 3 of mercury, bromide and rare gas was filled in the short arc discharge lamp, the amount of mercury was 0.15 mg.
/ If mm is less than 3, the lower the continuous spectrum intensity of the visible light region is lower mercury vapor pressure, and because not to obtain desired optical characteristics and lamp characteristics, the amount of mercury is 0.30 mg / mm 3 If it is larger than this, the internal pressure of the arc tube becomes too high, and the possibility that the arc tube bursts increases.
【００１８】また、発光管内に０．０３〜０．１ｍｇ／
ｍｍ3の水銀、発光物質としての金属ハロゲン化物及び
希ガスを封入するショートアーク放電ランプとしたの
も、前記理由と同様の理由からである。Further, 0.03 to 0.1 mg /
For the same reason as described above, a short arc discharge lamp in which mercury of mm 3 , a metal halide as a light-emitting substance, and a rare gas are sealed.
【００１９】図２は本発明に係る光源装置の一実施例を
示す概略断面図であり、反射面に多層膜を有する反射鏡
６の端部には、無機接着剤を介してショートアーク放電
ランプ７が固着され、前記反射鏡６の中心軸に沿って水
平に、ショートアーク放電ランプ７の電極の軸が配置さ
れている。液晶プロジェクタに前記光源装置を組み込ん
だところ、寿命、輝度、発光スペクトル等、好適な結果
を得ることができた。FIG. 2 is a schematic sectional view showing an embodiment of a light source device according to the present invention. A short arc discharge lamp is provided at an end of a reflecting mirror 6 having a multilayer film on a reflecting surface via an inorganic adhesive. 7 is fixed, and the axis of the electrode of the short arc discharge lamp 7 is arranged horizontally along the central axis of the reflecting mirror 6. When the light source device was incorporated in a liquid crystal projector, favorable results such as life, luminance, and emission spectrum could be obtained.
【００２０】[0020]
【発明の効果】以上のように、本発明のショートアーク
放電ランプは、管軸から上側内壁までの距離を確保する
ことにより発光管の結晶化を抑制でき、発光管下側の最
冷部温度を高め動作圧力を上げることによりランプ電圧
を設計値通りにでき、電極の消耗を抑え、長寿命かつ所
望のランプ特性を持ったショートアーク放電ランプが得
られる。また、所要形状の反射面を有する反射鏡と組合
わせ、水平点灯して用いることより、コンパクトで、光
学特性や寿命特性に優れた光源装置が得られる。As described above, in the short arc discharge lamp of the present invention, crystallization of the arc tube can be suppressed by securing the distance from the tube axis to the upper inner wall, and the temperature of the coldest part on the lower side of the arc tube can be reduced. By increasing the operating pressure and increasing the operating pressure, the lamp voltage can be made as designed, the consumption of electrodes can be suppressed, and a short arc discharge lamp having a long life and desired lamp characteristics can be obtained. In addition, a light source device that is compact and has excellent optical characteristics and life characteristics can be obtained by using it in combination with a reflecting mirror having a reflecting surface of a required shape and lighting it horizontally.
【図１】 本発明の一実施例であるショートアーク放電
ランプの断面図である。FIG. 1 is a sectional view of a short arc discharge lamp according to an embodiment of the present invention.
【図２】 本発明の一実施例である光源装置の断面図で
ある。FIG. 2 is a sectional view of a light source device according to an embodiment of the present invention.
１ 石英製発光管 ２ａ、２ｂ 電極 ３ 発光部 ４ａ、４ｂ 金属箔 ５ａ、５ｂ 外部導線 ６ 反射鏡 ７ ショートアーク放電ランプ DESCRIPTION OF SYMBOLS 1 Quartz light emitting tube 2a, 2b Electrode 3 Light emitting part 4a, 4b Metal foil 5a, 5b External conductor 6 Reflector 7 Short arc discharge lamp
Claims (4)
内に、少なくとも水銀及び希ガスが封入され、電極間距
離が０．５〜２．５ｍｍで、水平点灯用のショートアー
ク放電ランプにおいて、前記電極の軸から前記石英製発
光管の発光部の鉛直方向上側最大径部までの長さをＤ
１、同じく前記石英製発光管の発光部の鉛直方向下側最
大径部までの長さをＤ２としたとき、１．１≦Ｄ１／Ｄ
２≦２．０とし、かつ発光部の管軸方向の水平長さをＬ
としたとき、 ２≦Ｌ／Ｄ２≦５ と規定したことを特徴とするショートアーク放電ラン
プ。At least mercury and a rare gas are sealed in a quartz arc tube having a pair of electrodes sealed at both ends, a distance between the electrodes is 0.5 to 2.5 mm, and a short arc discharge lamp for horizontal lighting. , The length from the axis of the electrode to the maximum diameter part on the upper side in the vertical direction of the light emitting part of the quartz arc tube is D
1. Similarly, when the length of the light emitting portion of the quartz light emitting tube to the vertically lower maximum diameter portion is D2, 1.1 ≦ D1 / D.
2 ≦ 2.0, and the horizontal length of the light emitting section in the tube axis direction is L
Wherein 2 ≦ L / D2 ≦ 5.
／ｍｍ3の水銀と、臭化物および希ガスを封入したこと
を特徴とする請求項１記載のショートアーク放電ラン
プ。2. An amount of 0.15 to 0.30 mg in the arc tube.
2. A short arc discharge lamp according to claim 1, wherein mercury at a rate of / mm 3 and bromide and a rare gas are sealed.
ｍｍ3の水銀と、金属ハロゲン化物および希ガスを封入
したことを特徴とする請求項１記載のショートアーク放
電ランプ。3. An amount of 0.03 to 0.1 mg /
2. The short arc discharge lamp according to claim 1, wherein mercury of mm 3 , a metal halide and a rare gas are sealed.
ク放電ランプと、略楕円面、略放物面、あるいはそれら
の組合せの形状からなる反射鏡を有し、前記ショートア
ーク放電ランプが前記反射鏡の端部に前記反射鏡の中心
軸に沿って水平に、前記ショートアーク放電ランプの電
極の軸が配置されたことを特徴とする光源装置。4. A short arc discharge lamp according to claim 1, further comprising a reflecting mirror having a substantially elliptical surface, a substantially parabolic surface, or a combination thereof. A light source device, wherein an axis of an electrode of the short arc discharge lamp is disposed horizontally at an end of the reflector along a central axis of the reflector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11149170A JP2000340173A (en) | 1999-05-28 | 1999-05-28 | Short arc discharge lamp and light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11149170A JP2000340173A (en) | 1999-05-28 | 1999-05-28 | Short arc discharge lamp and light source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000340173A true JP2000340173A (en) | 2000-12-08 |
Family
ID=15469339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11149170A Pending JP2000340173A (en) | 1999-05-28 | 1999-05-28 | Short arc discharge lamp and light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000340173A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0562952U (en) * | 1992-01-28 | 1993-08-20 | ウシオ電機株式会社 | Horizontal lighting metal halide discharge lamp |
-
1999
- 1999-05-28 JP JP11149170A patent/JP2000340173A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0562952U (en) * | 1992-01-28 | 1993-08-20 | ウシオ電機株式会社 | Horizontal lighting metal halide discharge lamp |
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