JPH0864179A - Deuterium discharge lamp - Google Patents
Deuterium discharge lampInfo
- Publication number
- JPH0864179A JPH0864179A JP19511894A JP19511894A JPH0864179A JP H0864179 A JPH0864179 A JP H0864179A JP 19511894 A JP19511894 A JP 19511894A JP 19511894 A JP19511894 A JP 19511894A JP H0864179 A JPH0864179 A JP H0864179A
- Authority
- JP
- Japan
- Prior art keywords
- discharge tube
- deuterium
- container
- ultraviolet
- light
- 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
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、分光光度計、液体クロ
マトグラフィの光検知器などの紫外域光源として用いら
れる重水素放電管に係り、特に重水素放電管の放射輝度
の向上およびノイズの低減に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deuterium discharge tube used as an ultraviolet light source for a spectrophotometer, a photodetector for liquid chromatography, and the like, and more particularly to improving the radiance and reducing noise of the deuterium discharge tube. Regarding
【0002】[0002]
【従来の技術】重水素放電管については、「日本分光学
会編、光源の特性と使い方(昭和60年3月、学会出版
センタ−)の20頁から30頁」に記載されている。2. Description of the Related Art Deuterium discharge tubes are described in "Light Source Characteristics and Usage (Mar. 1985, Academic Society Publishing Center), pp. 20 to 30," edited by The Spectroscopical Society of Japan.
【0003】重水素放電管の外観は、図4(a)に示す様
にバルブ1は筒状であり、紫外線透過ガラスを用い、端
面をステム12と溶着によって密閉容器となっている。
管内には陰極および陽極を囲った金属隔壁2と重水素ガ
スまたは水素ガスが数百Pa封入されている。5は光取
り出し方向を示す。13は各電極に電力を供給するため
の導入線である。As for the appearance of the deuterium discharge tube, as shown in FIG. 4 (a), the bulb 1 has a cylindrical shape and is made of an ultraviolet-transparent glass, and its end face is welded to the stem 12 to form a closed container.
A metal partition wall 2 which surrounds the cathode and the anode and several hundred Pa of deuterium gas or hydrogen gas are enclosed in the tube. Reference numeral 5 indicates a light extraction direction. Reference numeral 13 is an introduction line for supplying electric power to each electrode.
【0004】図4(b)は上記重水素放電管の電極中心部
の横断面図を示す。電極にはコイル状のフィラメントか
らなる陰極6と平板状陽極7を配置し、陰、陽極の途中
には放電を狭窄させるための***9を有す隔壁板3を設
けた構造の放電管である。また、2の電極囲いは放電路
制御のためであり、ニッケルなどの金属で遮蔽する密閉
の金属隔壁である。上記構造の放電管に直流電圧を印加
し放電させると、放電路を狭窄する***部で、封入する
ガスの重水素または水素が発光し、紫外域に強い連続ス
ペクトルを放射する。放電路を狭窄する***部はモリブ
デンからなる板状に窪みを設け、窪みの中心部に***を
設けた構造である。上記***を持つ隔壁板は、電極中心
部に構成されている。従来技術のバルブ1は筒状であ
り、電極中心部の***部で発光した光は、筒状バルブの
凹面部を通過する際に光が外側へ屈折され、光の放射角
が大きくなる。また、バルブとして用いる紫外線透過ガ
ラスは紫外域で透過率が減少し、特に200nm以下の
波長域では、透過率の減少が著しい。透過率を向上させ
るには、合成石英を窓材として用いることが望ましい。
合成石英は200nm以下の波長域において、紫外線透
過ガラスより約2倍の透過率を有するが、合成石英を用
いることにより、180nm以下の短波長域の光も透過
するために、光軸上にオゾンを生成する。オゾンは25
0nm付近で吸収が起こり、ノイズを発生する原因とな
る。従って、低ノイズ化のために、紫外線透過ガラスが
用いられている。また、コスト的にも安価な筒状バルブ
構造が一般的である。上述した様に透過率の減少と光の
屈折による放射角が大きくなることで、集光効率の低下
などにより、光の信号強度が低下し、ノイズが増加して
くる。このため、200nm以下の波長域ではN/S比
が極端に低下し、分析感度を低下させる要因であった。FIG. 4 (b) is a cross-sectional view of the center of the electrode of the deuterium discharge tube. The discharge tube has a structure in which a cathode 6 made of a coil-shaped filament and a flat plate-shaped anode 7 are arranged as electrodes, and a partition plate 3 having a small hole 9 for narrowing discharge is provided in the middle of the cathode and the anode. . The second electrode enclosure is for controlling the discharge path and is a closed metal partition wall shielded by a metal such as nickel. When a DC voltage is applied to the discharge tube having the above structure to cause discharge, deuterium or hydrogen as a gas to be enclosed emits light through a small hole that narrows the discharge path, and emits a strong continuous spectrum in the ultraviolet region. The small hole portion that narrows the discharge path has a structure in which a plate-like recess made of molybdenum is provided and a small hole is provided at the center of the recess. The partition plate having the small holes is formed at the center of the electrode. The bulb 1 of the prior art has a tubular shape, and the light emitted from the small hole portion at the center of the electrode is refracted outward when passing through the concave portion of the tubular bulb, and the emission angle of the light becomes large. Further, the ultraviolet transmissive glass used as a bulb has a reduced transmittance in the ultraviolet region, and particularly in a wavelength region of 200 nm or less, the transmittance is significantly reduced. In order to improve the transmittance, it is desirable to use synthetic quartz as a window material.
Synthetic quartz has approximately twice the transmittance in the wavelength range of 200 nm or less as compared with ultraviolet-transparent glass, but by using synthetic quartz, light in the short wavelength range of 180 nm or less is also transmitted, so that ozone is placed on the optical axis. To generate. 25 ozone
Absorption occurs near 0 nm, which causes noise. Therefore, in order to reduce the noise, the ultraviolet transmitting glass is used. In addition, a tubular valve structure that is inexpensive is common. As described above, the decrease in the transmittance and the increase in the radiation angle due to the refraction of light cause a decrease in the light collection efficiency and the like, resulting in a decrease in the signal intensity of light and an increase in noise. Therefore, in the wavelength range of 200 nm or less, the N / S ratio is extremely lowered, which is a factor of lowering the analysis sensitivity.
【0005】[0005]
【発明が解決しようとする課題】上記従来技術による重
水素放電管で、200nm以下のN/S比向上を図るた
めには、放射輝度を向上させること、光放射窓部となる
紫外線透過ガラスの板厚を薄くする方法および光の放射
角を狭くする方法が考えられる。上記放射輝度を向上さ
せることは、放電電流を増加する方法があるが、上記方
法では短寿命の原因および温度上昇による不具合が生じ
る。また、窓部となる紫外線透過ガラスの板厚を薄くす
ることは有効な手段であるが、ガラス強度から0.3m
m程度は必要であり、透過率の向上は数%である。従っ
て、放電管の狭窄部で発光した光がガラス面を通過する
際に放射角の広がりを無くすことにより、高い放射輝度
が得られ、かつノイズが小さい重水素放電管を得ること
を目的とする。In order to improve the N / S ratio of 200 nm or less in the deuterium discharge tube according to the above-mentioned prior art, it is necessary to improve the radiance and to improve the radiance of the ultraviolet-transparent glass used as the light emission window. A method of reducing the plate thickness and a method of narrowing the radiation angle of light can be considered. To improve the radiance, there is a method of increasing the discharge current. However, the above method causes a short life and causes problems due to temperature rise. Also, it is an effective means to reduce the thickness of the UV transparent glass that becomes the window, but it is 0.3 m due to the glass strength.
About m is necessary, and the improvement in transmittance is several%. Therefore, an object of the present invention is to obtain a deuterium discharge tube with high radiance and low noise by eliminating the spread of the radiation angle when the light emitted in the narrowed portion of the discharge tube passes through the glass surface. .
【0006】[0006]
【課題を解決するための手段】上記目的は、重水素また
は水素を封入した管内に、電子放射物を塗布した陰極と
陽極とを囲み、上記陰極から上記陽極に至る放電路を形
成する金属隔壁を設け、上記金属隔壁の一部に上記放電
路を狭窄するための***を持つ隔壁板を設けた重水素放
電管において、放電管容器の一部である光の放射部分を
平面にすることによって、放射光がガラスを通過する際
に生じる放射角の拡大を防止することができ、上記目的
を達成できる。The above object is to provide a metal partition wall which surrounds a cathode and an anode coated with an electron emission material in a tube filled with deuterium or hydrogen and forms a discharge path from the cathode to the anode. In the deuterium discharge tube in which a partition plate having a small hole for narrowing the discharge path is provided in a part of the metal partition, by making the light emitting part, which is a part of the discharge tube container, flat. The expansion of the radiation angle that occurs when the emitted light passes through the glass can be prevented, and the above object can be achieved.
【0007】[0007]
【作用】本発明の重水素放電管の電極中心部の横断面図
を示す。図において、1は放電管容器のバルブを示し、
光を取り出す方向の一部を平面状にしてあり、放電管端
部でステムと溶着により密閉容器となし、容器内には電
極部と重水素ガスが封入してある。電極部は、陰極6を
構成するタングステン線からなるフィラメントに電子放
射物質が塗布してある。陽極7にはモリブデン等からな
る平板状電極とし、陰、陽極間には放電を狭窄させるた
めの***9が設けてある隔壁板3がある。放電狭窄用の
***は直径1mmとし、***の周囲には指向性をもたせ
るため窪みを設けてある。電極はニッケル等の金属板で
電極を覆った構造の金属隔壁2遮蔽している。FIG. 3 is a cross sectional view of the central portion of the electrode of the deuterium discharge tube of the present invention. In the figure, 1 indicates a bulb of a discharge tube container,
A part of the direction of extracting light is made flat, and the end of the discharge tube is welded to the stem to form a closed container, and the electrode part and deuterium gas are enclosed in the container. In the electrode portion, an electron emitting substance is applied to a filament made of a tungsten wire forming the cathode 6. There is a partition plate 3 which is a flat plate electrode made of molybdenum or the like for the anode 7, and a small hole 9 for narrowing the discharge is provided between the cathode and the anode. The small hole for discharge constriction has a diameter of 1 mm, and a recess is provided around the small hole to give directivity. The electrode is shielded by a metal partition wall 2 having a structure in which the electrode is covered with a metal plate such as nickel.
【0008】上記構造の重水素放電管の陰、陽極間に直
流電圧を印加し放電させると、それぞれの***部で重水
素ガスが発光し、紫外域に強い連続スペクトルを得るこ
とができる。上記放射光は容器のバルブに設けた平面部
より放射させるため、通過する際に生じる屈折が小さ
く、放射角度を広げないため、集光効率が向上する。When a direct current voltage is applied between the cathode and the anode of the deuterium discharge tube having the above structure to cause discharge, deuterium gas emits light in each small hole portion, and a continuous spectrum strong in the ultraviolet region can be obtained. Since the emitted light is emitted from the flat portion provided on the bulb of the container, refraction occurring when passing through is small and the emission angle is not widened, so that the light collection efficiency is improved.
【0009】[0009]
【実施例】つぎに本発明の実施例を図面とともに説明す
る。図1は、本発明の第1の実施例を示す重水素放電管
の電極中心部を示す横断面図である。重水素放電管の電
極付近の構造は従来技術で記述した通りである。1は放
電管容器を示し、筒状のバルブの一部を平面状とした光
取り出し窓4を設けてある。放電管容器となるバルブは
紫外線透過ガラスからなり、端部は同種と同等の熱膨張
係数である硬質ガラスからなるステムと溶着された密閉
容器を形成している。また、ステムには電極を組立てる
ためのリ−ド線および導入線が埋め込まれている。2は
電極類を囲う金属隔壁である。5は光取り出し方向であ
る。上記バルブ1内には重水素ガスを数百Pa封入して
ある。バルブ1の中心部には、電極部分を遮蔽する金属
隔壁3は、ニッケル板からなり、陰極室と陽極室とを分
離し、上記金属隔壁2にはニッケルからなる隔壁板3を
挟んで、タングステンからなる3重コイルのフィラメン
トに熱電子放射物質であるBaO、SrO、CaO等の
酸化物が塗布してある陰極6およびモリブデンからなる
平板状の陽極7とが、上記隔壁板3の放電狭窄用***9
を挟んで対置されている。Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a transverse cross-sectional view showing a central portion of an electrode of a deuterium discharge tube showing a first embodiment of the present invention. The structure near the electrodes of the deuterium discharge tube is as described in the prior art. Reference numeral 1 denotes a discharge tube container, which is provided with a light extraction window 4 in which a cylindrical bulb is partially flat. The bulb serving as the discharge tube container is made of ultraviolet-transparent glass, and the end portion forms a sealed container welded to the stem made of hard glass having a thermal expansion coefficient similar to that of the same kind. A lead wire and an introduction wire for assembling the electrode are embedded in the stem. Reference numeral 2 is a metal partition wall surrounding the electrodes. 5 is a light extraction direction. The valve 1 is filled with several hundred Pa of deuterium gas. At the center of the bulb 1, a metal partition wall 3 that shields the electrode portion is made of a nickel plate, separates the cathode chamber and the anode chamber, and the metal partition wall 2 is sandwiched by a partition wall plate 3 made of nickel. A triple coil of a filament made of molybdenum such as BaO, SrO, CaO or the like coated on the filament, and a flat anode 7 made of molybdenum. Small hole 9
They are placed opposite to each other.
【0010】隔壁板に設けた***9を形成する部材8は
モリブデンを用い、ニッケルからなる隔壁板と溶接によ
り固定してある。***の直径は1mmとし、上記***の
周囲には窪みを設け、光の指向性を持たせてある。また
陽極室は放電陽光柱が放電狭窄部を通過する様強制する
ために、上下とも金属のふたを設け、陽極室内を密閉状
態の構造とした。The member 8 for forming the small holes 9 provided in the partition plate is made of molybdenum and is fixed to the partition plate made of nickel by welding. The diameter of the small hole is 1 mm, and a depression is provided around the small hole to give the directivity of light. Further, in order to force the positive discharge column to pass through the discharge constriction, the anode chamber was provided with metal lids on the top and bottom, and the inside of the anode chamber was sealed.
【0011】4は光取り出し部分を示し、平面からなる
紫外域透過ガラスを用いた。放電狭窄部で発光した光を
上記平面部よりの取り出すためである。Reference numeral 4 indicates a light extraction portion, and a flat ultraviolet transmission glass is used. This is because the light emitted from the discharge constriction portion is extracted from the plane portion.
【0012】上記構造の重水素放電管を陰極であるフィ
ラメントに電流を流し、予熱を行った後、陰陽極間に直
流電圧を印加して、重水素ガスの放電を起こさせると、
放電路を狭窄した***部で陽光柱10が発生する。***
部で発生した陽光柱からは、紫外域に強い連続スペクト
ルを放射する。When a deuterium discharge tube of the above structure is preheated by passing a current through the filament which is the cathode, a DC voltage is applied between the negative and positive electrodes to cause discharge of deuterium gas,
The positive column 10 is generated in the small hole portion that narrows the discharge path. The positive column generated in the small hole emits a strong continuous spectrum in the ultraviolet region.
【0013】図2は第2の実施例を示す。電極構造は第
1の実施例と同一であるが、密閉容器を構成しているバ
ルブ1に突き出した光取り出し用の平面窓11を設けた
構造である。バルブは硬質ガラスからなり、光取り出し
窓には平面の紫外線透過ガラスを用いた構造の重水素放
電管である。FIG. 2 shows a second embodiment. The electrode structure is the same as that of the first embodiment, but the structure is such that a flat window 11 for extracting light is provided in the bulb 1 which constitutes the closed container. The bulb is a deuterium discharge tube having a structure made of hard glass, and a flat UV transparent glass is used for the light extraction window.
【0014】図3は本発明の重水素放電管と従来技術の
重水素放電管の195nmにおける窓材の厚さとノイズ
の関係を示す図である。図に示す様に、窓材の厚さにほ
ぼ比例し、厚くなるに従いノイズが増加する。これは透
過率の低下による放射輝度減少によるものである。従っ
て、窓材が薄い程、低ノイズの重水素放電管が得られ
る。窓材を同一厚さで比較した場合、ノイズの大きさは
本発明の重水素放電管が従来技術の約1/2である。FIG. 3 is a diagram showing the relationship between the thickness of the window material and the noise at 195 nm in the deuterium discharge tube of the present invention and the prior art deuterium discharge tube. As shown in the figure, it is almost proportional to the thickness of the window material, and the noise increases as the thickness increases. This is due to a decrease in radiance due to a decrease in transmittance. Therefore, the thinner the window material is, the less noise the deuterium discharge tube can be obtained. When the window materials are compared with the same thickness, the deuterium discharge tube of the present invention has a noise level of about half that of the prior art.
【0015】上記簡単な構造の重水素放電管により、従
来の凹面状のガラスから放射した光の様に、ガラスを透
過する際の屈折による放射角度を広げることなく、狭い
放射角度で光が得られるため、200nm以下の短波長
域で高い輝度が得られると共に、ノイズの小さい重水素
放電管を得ることができる。With the deuterium discharge tube having the above-mentioned simple structure, light can be obtained with a narrow emission angle without widening the emission angle due to the refraction when passing through the glass, unlike the light emitted from the conventional concave glass. Therefore, high luminance can be obtained in a short wavelength region of 200 nm or less, and a deuterium discharge tube with low noise can be obtained.
【0016】[0016]
【発明の効果】本発明の重水素放電管により、簡単な構
造で図3に示す様に、短波長域において、従来の約1/
2のノイズとなり、本発明の重水素放電管を用いること
によって、液体クロマトグラフおよび光の吸収による分
析を行う分析装置の分析感度をより向上させる効果があ
る。The deuterium discharge tube of the present invention has a simple structure, as shown in FIG.
2 becomes noise, and by using the deuterium discharge tube of the present invention, there is an effect of further improving the analysis sensitivity of the liquid chromatograph and the analysis device that performs analysis by absorption of light.
【図1】第1の実施例を示す重水素放電管の電極中心部
の横断面図。FIG. 1 is a transverse cross-sectional view of a central portion of an electrode of a deuterium discharge tube showing a first embodiment.
【図2】第2の実施例を示す重水素放電管の電極中心部
の横断面図。FIG. 2 is a cross-sectional view of an electrode center portion of a deuterium discharge tube showing a second embodiment.
【図3】重水素放電管の短波長域におけるノイズ特性。FIG. 3 shows noise characteristics of a deuterium discharge tube in a short wavelength region.
【図4】重水素放電管の従来例を示す外観図と電極中心
部の横断面図。FIG. 4 is an external view showing a conventional example of a deuterium discharge tube and a cross-sectional view of the center of an electrode.
1…バルブ、2…電極囲い、3…隔壁板、4…光取り出
し窓、5…光取り出し方向、6…陰極、7…陽極、8…
***部材、9…***、10…陽光柱、11…突出し窓、
12…ステム、13…導入線。1 ... Bulb, 2 ... Electrode enclosure, 3 ... Partition plate, 4 ... Light extraction window, 5 ... Light extraction direction, 6 ... Cathode, 7 ... Anode, 8 ...
Small hole member, 9 ... Small hole, 10 ... Sunlight column, 11 ... Projecting window,
12 ... Stem, 13 ... Introduction line.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 市川 正大 東京都青梅市藤橋888番地 株式会社日立 製作所リビング機器事業部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Ichikawa 888 Fujibashi, Ome-shi, Tokyo Hitachi Ltd. Living Equipment Division
Claims (5)
電子放射物質を塗布した陰極と陽極とを囲み、上記陰極
から上記陽極に至る放電路を形成する金属隔壁を設け、
上記金属隔壁の一部に放電路を狭窄するための***を設
けた重水素放電管に於いて、筒状の放電管容器には紫外
線透過ガラスまたは、硬質ガラスを用い、光の取り出し
部の一部分または光放射面を平面にした容器構造を特徴
とする重水素放電管。1. A tube filled with deuterium or hydrogen gas,
Surrounding the cathode and the anode coated with an electron emitting material, providing a metal partition wall forming a discharge path from the cathode to the anode,
In a deuterium discharge tube in which a small hole for narrowing the discharge path is provided in a part of the metal partition, ultraviolet ray transmissive glass or hard glass is used for the cylindrical discharge tube container, and a part of the light extraction part is used. Alternatively, a deuterium discharge tube characterized by a container structure having a flat light emitting surface.
た部分を設け、先端には紫外線透過ガラスからなる平面
状の光放射窓を有す容器構造を特徴とした請求項1の重
水素放電管。2. The deuterium according to claim 1, wherein the discharge tube container is provided with a portion projecting forward in the vicinity of the light emission, and has a container structure having a flat light emission window made of ultraviolet-transparent glass at the tip. Discharge tube.
部分に紫外線透過ガラスを用いた構造を特徴とした請求
項1の重水素放電管。3. The deuterium discharge tube according to claim 1, wherein the discharge tube container has a structure in which an ultraviolet transparent glass is used in a part of the vicinity of light emission.
分の平面板厚を1mm以下にしたことを特徴とした請求
項1の重水素放電管。4. The deuterium discharge tube according to claim 1, wherein the flat plate thickness of the portion of the ultraviolet transmitting glass which becomes the light emitting window is 1 mm or less.
重水素放電管を光源として用いたことを特徴とした液体
クロマトグラフ用光検出器または分光光度計。5. A photodetector for a liquid chromatograph or a spectrophotometer, characterized by using as a light source a deuterium discharge tube having a structure comprising a container provided with the plane portion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19511894A JPH0864179A (en) | 1994-08-19 | 1994-08-19 | Deuterium discharge lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19511894A JPH0864179A (en) | 1994-08-19 | 1994-08-19 | Deuterium discharge lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0864179A true JPH0864179A (en) | 1996-03-08 |
Family
ID=16335801
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19511894A Pending JPH0864179A (en) | 1994-08-19 | 1994-08-19 | Deuterium discharge lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0864179A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000034983A1 (en) * | 1998-12-09 | 2000-06-15 | Hamamatsu Photonics K.K. | Gas discharge tube |
EP1043756A1 (en) * | 1997-12-24 | 2000-10-11 | Hamamatsu Photonics K.K. | Gas discharge tube |
EP1049135A1 (en) * | 1997-12-24 | 2000-11-02 | Hamamatsu Photonics K.K. | Gas discharge tube |
JP2001332218A (en) * | 2000-05-25 | 2001-11-30 | Hamamatsu Photonics Kk | Light source |
-
1994
- 1994-08-19 JP JP19511894A patent/JPH0864179A/en active Pending
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1043756A1 (en) * | 1997-12-24 | 2000-10-11 | Hamamatsu Photonics K.K. | Gas discharge tube |
EP1049135A1 (en) * | 1997-12-24 | 2000-11-02 | Hamamatsu Photonics K.K. | Gas discharge tube |
EP1043756A4 (en) * | 1997-12-24 | 2002-04-10 | Hamamatsu Photonics Kk | Gas discharge tube |
EP1049135A4 (en) * | 1997-12-24 | 2002-04-10 | Hamamatsu Photonics Kk | Gas discharge tube |
US6531821B1 (en) | 1997-12-24 | 2003-03-11 | Hamamatsu Photonics K.K. | Gas discharge tube |
EP1043756B1 (en) * | 1997-12-24 | 2003-03-19 | Hamamatsu Photonics K.K. | Gas discharge tube |
EP1049135B1 (en) * | 1997-12-24 | 2003-03-19 | Hamamatsu Photonics K.K. | Gas discharge tube |
US6559576B1 (en) | 1997-12-24 | 2003-05-06 | Hamamatsu Photonics K.K. | Gas discharge tube having sealed envelope with metallic portion and light projection glass window |
WO2000034983A1 (en) * | 1998-12-09 | 2000-06-15 | Hamamatsu Photonics K.K. | Gas discharge tube |
JP2001332218A (en) * | 2000-05-25 | 2001-11-30 | Hamamatsu Photonics Kk | Light source |
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