JPH0554854A - Electrode for use in discharge lamp - Google Patents
Electrode for use in discharge lampInfo
- Publication number
- JPH0554854A JPH0554854A JP3235689A JP23568991A JPH0554854A JP H0554854 A JPH0554854 A JP H0554854A JP 3235689 A JP3235689 A JP 3235689A JP 23568991 A JP23568991 A JP 23568991A JP H0554854 A JPH0554854 A JP H0554854A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- emitter
- discharge lamp
- tungsten
- axis
- 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.)
- Granted
Links
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 28
- 239000010937 tungsten Substances 0.000 claims abstract description 27
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 7
- 229910052777 Praseodymium Inorganic materials 0.000 claims abstract description 7
- 229910052772 Samarium Inorganic materials 0.000 claims abstract description 7
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims abstract description 7
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims abstract description 7
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 12
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 6
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 claims description 6
- 239000013078 crystal Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 2
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、分析機器や一般照明用
などに使用される高圧放電灯用の電極に関すものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode for a high pressure discharge lamp used for analytical instruments and general lighting.
【０００２】[0002]
【従来の技術】キセノンショートアークランプや高圧水
銀灯などの高圧放電灯は、分析機器用の光源ランプや一
般照明用などに幅広く使用されている。この高圧放電灯
の電極は、エミッタが内部に分散したタングステンロッ
ドが使用されるが、エミッタとして、トリウム、イット
リウム、セリウム、ランタンなどの酸化物がよく知られ
ている。2. Description of the Related Art High-pressure discharge lamps such as xenon short arc lamps and high-pressure mercury lamps are widely used as light source lamps for analytical instruments and general lighting. A tungsten rod having an emitter dispersed therein is used as an electrode of the high-pressure discharge lamp, and oxides such as thorium, yttrium, cerium, and lanthanum are well known as the emitter.
【０００３】ところで、高圧放電灯の電極は、電流密度
が高く、電極の先端はきわめて高温になる条件で使用さ
れるので、その先端が消耗しやすい。電極の先端が消耗
すると、点灯電圧が変動し、アーク輝点が動く。従っ
て、アークが不安定になる。By the way, the electrodes of the high pressure discharge lamp are used under the condition that the current density is high and the tip of the electrode becomes extremely hot, so that the tip is easily worn. When the tip of the electrode is consumed, the lighting voltage fluctuates and the arc bright spot moves. Therefore, the arc becomes unstable.
【０００４】[0004]
【発明が解決しようとする課題】電極先端の消耗は、エ
ミッタの蒸気圧やタングステンとの反応性などが影響す
るが、蒸気圧が低く、かつタングステンと良く反応する
エミッタを使用すると消耗を抑制することができる。従
って、エミッタ自体の特性が重要であり、電極先端にエ
ミッタが絶えず順調に供給されなければならない。そし
て、このためには、スエージなどの加工工程を経たタン
グステンロッドで電極に成形し、熱処理したときに、タ
ングステンロッド中に分散するエミッタがタングステン
ロッドの軸線方向に細長く伸びることが必要である。つ
まり、エミッタは表面積が大きく、拡散しやすい形状で
あることが要求される。The consumption of the electrode tip is affected by the vapor pressure of the emitter and the reactivity with tungsten, but the consumption is suppressed by using an emitter having a low vapor pressure and reacting well with tungsten. be able to. Therefore, the characteristics of the emitter itself are important, and the emitter must be constantly and smoothly supplied to the electrode tip. For this purpose, it is necessary that the emitter dispersed in the tungsten rod be elongated in the axial direction of the tungsten rod when the electrode is formed by the tungsten rod that has undergone a processing step such as swaging and heat treatment is performed. That is, the emitter is required to have a large surface area and a shape that facilitates diffusion.
【０００５】本発明は、以上のような問題点を解決する
ために成されたものであり、その目的とするところは、
長時間点灯しても電極先端の消耗が少なく、アークが長
時間安定する放電灯用電極を提供することにある。The present invention has been made to solve the above problems, and its purpose is to:
Another object of the present invention is to provide an electrode for a discharge lamp in which the tip of the electrode is not worn down even after long-time lighting and the arc is stable for a long time.
【０００６】[0006]
【課題を解決するための手段】本発明の放電灯用電極
は、エミッタとして、プラセオジム（Ｐｒ）、ネオジム
（Ｎｄ）、サマリウム（Ｓｍ）、ガドリニウム（Ｇｄ）
より選ばれた酸化物を含み、理論密度の９５％以上の密
度を有するタングステンロッドよりなり、このタングス
テンロッド中に分散して含まれる前記酸化物は、タング
ステンロッドの軸線方向の平均粒子径をＬ、軸線に直角
方向の平均粒子径をＷとするとき、タングステンロッド
の軸線から直角な方向の少なくとも１０％以内の領域に
おいて、Ｌ／Ｗ≧２であって、Ｗ≦１０μm であること
を特徴とする。DISCLOSURE OF THE INVENTION The electrode for a discharge lamp according to the present invention is used as an emitter for praseodymium (Pr), neodymium (Nd), samarium (Sm), gadolinium (Gd).
The oxide is made of a tungsten rod having a density of 95% or more of the theoretical density, and the oxide contained in the tungsten rod dispersed therein has an average particle diameter of the tungsten rod in the axial direction of L. When the average particle diameter in the direction perpendicular to the axis is W, L / W ≧ 2 and W ≦ 10 μm in at least 10% of the area perpendicular to the axis of the tungsten rod. To do.
【０００７】[0007]
【作用】エミッタとして、プラセオジム（Ｐｒ）、ネオ
ジム（Ｎｄ）、サマリウム（Ｓｍ）、ガドリニウム（Ｇ
ｄ）より選ばれた酸化物を使用するので、スエージなど
の加工工程を経たタングステンロッドで電極を成形すれ
ば、エミッタはタングステンロッドの軸線方向の平均粒
子径Ｌと軸線に直角方向の平均粒子径Ｗの比、Ｌ／Ｗが
２以上でＷが１０μm以下となる。従って、この電極を
備えた放電灯は、エミッタが電極の先端に絶えず供給さ
れ、アークも安定する。[Function] As an emitter, praseodymium (Pr), neodymium (Nd), samarium (Sm), gadolinium (G)
Since the oxide selected from d) is used, if the electrode is formed with a tungsten rod that has undergone a processing step such as swaging, the emitter will have an average particle size L in the axial direction of the tungsten rod and an average particle size in the direction perpendicular to the axial line. When the ratio of W, L / W is 2 or more, W is 10 μm or less. Therefore, in a discharge lamp equipped with this electrode, the emitter is constantly supplied to the tip of the electrode, and the arc is stabilized.
【０００８】[0008]
【実施例】以下に図面に示す実施例に基づいて本発明を
具体的に説明する。図１は、本発明である電極内部の結
晶構造を示した図で、１はタングステンロッドよりなる
電極、２はこの電極１内に存在する結晶粒子、３は結晶
粒子２間にできる粒界、４は電極の先端に形成される平
坦部である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1 is a diagram showing a crystal structure inside an electrode according to the present invention, in which 1 is an electrode made of a tungsten rod, 2 is a crystal grain existing in the electrode 1, 3 is a grain boundary formed between the crystal grains 2, Reference numeral 4 is a flat portion formed at the tip of the electrode.
【０００９】この電極１はエミッタとして、プラセオジ
ム、ネオジム、サマリウム、ガドリニウムより選ばれた
酸化物の粉末をタングステン粉末と混合し、プレス、焼
結、スエージなどの加工工程の後に、熱処理されたもの
である。この処理により、電極１の理論密度（タングス
テン単結晶の密度１９．３ｇ／cm3 を１００％としとた
場合の密度）は９５％以上になるようにする。また、エ
ミッタの使用量は、必要最低限のエミッタ量やスエージ
加工のしやすさなどを考慮すると、０.１〜５.０重量％
の範囲であることが好ましい。そして熱処理条件は、例
えば、真空度１×１０-6torr、温度２０００℃、加熱時
間１５分である。This electrode 1 is an emitter that is obtained by mixing oxide powder selected from praseodymium, neodymium, samarium and gadolinium with tungsten powder, and heat-treating it after processing steps such as pressing, sintering and swaging. is there. By this treatment, the theoretical density of the electrode 1 (the density when the density of tungsten single crystal 19.3 g / cm 3 is 100%) is set to 95% or more. The amount of emitter used is 0.1-5.0% by weight, considering the minimum required amount of emitter and the ease of swaging.
The range is preferably. The heat treatment conditions are, for example, a vacuum degree of 1 × 10 −6 torr, a temperature of 2000 ° C., and a heating time of 15 minutes.
【００１０】図２は、以上のようにして得られた本発明
の拡大断面図であり、タングステンの結晶が軸線方向に
長く伸び、この結晶の間にエミッタ粒子が分散している
様子を示すが、このエミッタ粒子は、前述のとおり、軸
線方向の平均粒子径をＬ、軸線に直角方向の平均粒子径
をＷとするとき、Ｌ／Ｗ≧２、かつＷ≦１０μm の関係
を満たしており、極めて小さくて細長い形状をしてい
る。このため、エミッタ粒子は表面積が大きくなるので
還元されやすくなり、タングステン結晶粒界の間を軸線
方向に移動し易く、点灯中に電極先端のエミッタが消耗
しても、後方に存在するエミッタを絶えず順調に電極先
端に供給できる。なお、同じ希土類元素であっても、ラ
ンタン（Ｌａ）の酸化物を分散させて同じ処理を行った
ところ、Ｌ／Ｗ≧２、かつＷ≦１０μm を満たすことは
できなかった。従って、電極先端への供給が不十分であ
る。FIG. 2 is an enlarged cross-sectional view of the present invention obtained as described above, showing a state in which a tungsten crystal is elongated in the axial direction and the emitter particles are dispersed between the crystals. As described above, the emitter particles satisfy the relationship of L / W ≧ 2 and W ≦ 10 μm, where L is the average particle size in the axial direction and W is the average particle size in the direction perpendicular to the axis. It has an extremely small and elongated shape. For this reason, the emitter particles have a large surface area and are easily reduced, and easily move in the axial direction between the tungsten crystal grain boundaries, and even if the emitter at the electrode tip is consumed during lighting, the emitter existing behind is constantly It can be smoothly supplied to the electrode tip. Even with the same rare earth element, when the same treatment was performed by dispersing an oxide of lanthanum (La), it was not possible to satisfy L / W ≧ 2 and W ≦ 10 μm. Therefore, the supply to the electrode tip is insufficient.
【００１１】この構造のエミッタは、電極１においてそ
の中心軸から軸に垂直な方向に少なくとも１０％以内の
領域で存在する必要がある。これは、電極先端の平坦部
４が電極径の１０％以内の径を有し、この領域に電極内
部から直接粒界を通してエミッタが供給されるため、電
極の中心軸から軸に垂直な方向の少なくとも１０％以内
の領域が電極先端へのエミッタ供給に重要であるためで
ある。The emitter of this structure must be present in the electrode 1 in a region of at least 10% in the direction perpendicular to the central axis of the electrode 1. This is because the flat portion 4 at the tip of the electrode has a diameter within 10% of the electrode diameter, and the emitter is directly supplied to the region from the inside of the electrode through the grain boundary, so that the direction perpendicular to the axis from the central axis of the electrode This is because the area within at least 10% is important for supplying the emitter to the electrode tip.
【００１２】次に、エミッタとして、Ｓｍ2Ｏ3、Ｇｄ2
Ｏ3、Ｎｄ2Ｏ3、Ｐｒ6Ｏ11 をそれぞれ２wt％含有し、
理論密度が９８％のタングステンロッドから電極を成形
した交流点灯の高圧水銀灯を実際に製作し、点灯時のラ
ンプ電圧の変動を調査した。また、比較例として、希土
類酸化物のＬａ2Ｏ3(２wt％含有）および従来よりよく
使用されているＴｈＯ2 (２wt％含有)を含有したものも
同時に調査した。なお、ランプ電圧の変動は、点灯初期
のランプ電圧を基準とし、これに対する変動で表示し
た。その結果を図３に示すが、これから分かるように、
実施例であるＳｍ2Ｏ3、Ｇｄ2Ｏ3、Ｎｄ2Ｏ3、Ｐｒ6Ｏ
11は、いずれも点灯１００分後における電圧変動は±
１.５％ の範囲内である。つまり、電極先端の消耗が少
ないためにランプ電圧が安定し、輝点の移動が少なくて
長時間アークが安定していることを示している。これ
は、エミッタの形状が細長く、かつプラセオジム、ネオ
ジム、サマリウム、ガドリニウムの酸化物が電極先端の
消耗を抑制するのに好ましい特性を有するためである。
これに対して、比較例であるＬａ2Ｏ3およびＴｈＯ
2 は、点灯１００分後における電圧変動が大きく、電極
先端の消耗が多いことを示している。なお、この電極を
キセノンショートアークランプに使用しても同様の好結
果を得ることができる。Next, as emitters, Sm 2 O 3 and Gd 2 are used.
2 wt% each of O 3 , Nd 2 O 3 and Pr 6 O 11 is contained,
An alternating-current high-pressure mercury lamp in which an electrode was molded from a tungsten rod having a theoretical density of 98% was actually manufactured, and the fluctuation of the lamp voltage during lighting was investigated. Further, as a comparative example, a rare earth oxide containing La 2 O 3 (containing 2 wt%) and ThO 2 (containing 2 wt%), which has been used more frequently than before, was also investigated at the same time. The fluctuation of the lamp voltage is shown by the fluctuation with respect to the lamp voltage at the initial stage of lighting. The result is shown in Fig. 3. As you can see,
Examples are Sm 2 O 3 , Gd 2 O 3 , Nd 2 O 3 and Pr 6 O.
11 is that the voltage fluctuation after 100 minutes of lighting is ±
It is within the range of 1.5%. That is, it is shown that the lamp voltage is stable because the electrode tip wear is small, the movement of the bright spot is small, and the arc is stable for a long time. This is because the shape of the emitter is elongated and oxides of praseodymium, neodymium, samarium, and gadolinium have favorable characteristics for suppressing wear of the electrode tip.
On the other hand, comparative examples La 2 O 3 and ThO
No. 2 shows that the voltage fluctuation after 100 minutes of lighting is large, and the electrode tip is often consumed. The same good results can be obtained by using this electrode for a xenon short arc lamp.
【００１３】[0013]
【発明の効果】以上説明したように、本発明の放電灯用
電極は、エミッタとして、プラセオジム、ネオジム、サ
マリウム、ガドリニウムより選ばれた酸化物を含むタン
グステンロッドの、エミッタ粒子の縦径／横径（Ｌ／
Ｗ）を２以上、横径（Ｗ）を１０μm 以下にするので、
電極先端の消耗を抑制するのに効果的なエミッタが絶え
ず順調に電極先端に供給される。従って、電極先端の消
耗が少なくてアークが長時間安定する放電灯用電極とす
ることができる。As described above, the discharge lamp electrode of the present invention has a longitudinal / horizontal diameter of an emitter particle of a tungsten rod containing an oxide selected from praseodymium, neodymium, samarium and gadolinium as an emitter. (L /
Since W) is 2 or more and the lateral diameter (W) is 10 μm or less,
An emitter effective for suppressing the consumption of the electrode tip is constantly and smoothly supplied to the electrode tip. Therefore, it is possible to provide a discharge lamp electrode in which the tip of the electrode is less consumed and the arc is stable for a long time.
【図１】本発明の電極内部の結晶構造を示す図である。FIG. 1 is a diagram showing a crystal structure inside an electrode of the present invention.
【図２】図１の部分拡大図である。FIG. 2 is a partially enlarged view of FIG.
【図３】電圧変動の説明図である。FIG. 3 is an explanatory diagram of voltage fluctuations.
１ 電極 ２ 結晶粒子 ３ 粒界 ４ 平坦部 1 electrode 2 crystal grain 3 grain boundary 4 flat part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田川 幸治 兵庫県姫路市別所町佐土1194番地 ウシオ 電機株式会社内 (72)発明者 池内 満 兵庫県姫路市別所町佐土1194番地 ウシオ 電機株式会社内 (72)発明者 原 慶次 福岡県福岡市南区清水２丁目20番31号 日 本タングステン株式会社内 (72)発明者 山本 弘 福岡県福岡市南区清水２丁目20番31号 日 本タングステン株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koji Tagawa 1194 Sado, Bessho-cho, Himeji-shi, Hyogo Ushio Denki Co., Ltd. (72) Inventor Keiji Hara Nihon Tungsten Co., Ltd. 2-320 Shimizu, Minami-ku, Fukuoka-shi, Fukuoka (72) Inventor Hiroshi Yamamoto 2-20-31 Shimizu, Minami-ku, Fukuoka, Fukuoka Nihon Tungsten Within the corporation
Claims (1)
ｒ）、ネオジム（Ｎｄ）、サマリウム（Ｓｍ）、ガドリ
ニウム（Ｇｄ）より選ばれた酸化物を含み、理論密度の
９５％以上の密度を有するタングステンロッドよりな
り、当該タングステンロッド中に分散して含まれる前記
酸化物は、タングステンロッドの軸線方向の平均粒子径
をＬ、軸線に直角方向の平均粒子径をＷとするとき、タ
ングステンロッドの軸線から直角な方向の少なくとも１
０％以内の領域において、Ｌ／Ｗ≧２であって、Ｗ≦１
０μm であることを特徴とする放電灯用電極。1. An emitter, praseodymium (P
r), neodymium (Nd), samarium (Sm), gadolinium (Gd), and an oxide selected from the tungsten rods having a density of 95% or more of the theoretical density. When the average particle size of the tungsten rod in the axial direction is L and the average particle size of the tungsten rod in the direction perpendicular to the axis is W, the oxide is at least 1 in the direction perpendicular to the axis of the tungsten rod.
In the region within 0%, L / W ≧ 2 and W ≦ 1
An electrode for a discharge lamp characterized by having a thickness of 0 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3235689A JP2851727B2 (en) | 1991-08-23 | 1991-08-23 | Electrode for discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3235689A JP2851727B2 (en) | 1991-08-23 | 1991-08-23 | Electrode for discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0554854A true JPH0554854A (en) | 1993-03-05 |
| JP2851727B2 JP2851727B2 (en) | 1999-01-27 |
Family
ID=16989763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3235689A Expired - Fee Related JP2851727B2 (en) | 1991-08-23 | 1991-08-23 | Electrode for discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2851727B2 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7098597B2 (en) | 2003-03-31 | 2006-08-29 | Ushiodenki Kabushiki Kaisha | Xenon lamp |
| JP2006257150A (en) * | 2005-03-15 | 2006-09-28 | Sekisui Plastics Co Ltd | Carbon-containing and styrene-modified polyethylene-based resin particle and expandable resin particle, method for producing such particles, preliminarily expanded particle and expanded molded form |
| US7569994B2 (en) | 2005-03-31 | 2009-08-04 | Ushio Denki Kabushiki Kaisha | High-load and high-intensity discharge lamp |
| JP2009259790A (en) * | 2008-03-26 | 2009-11-05 | Harison Toshiba Lighting Corp | High-pressure discharge lamp |
| WO2011049049A1 (en) | 2009-10-19 | 2011-04-28 | 日本タングステン株式会社 | Tungsten cathode material |
| JP2012178329A (en) * | 2011-02-03 | 2012-09-13 | Ushio Inc | Negative electrode for discharge lamp |
| WO2012128303A1 (en) | 2011-03-23 | 2012-09-27 | 日本タングステン株式会社 | Tungsten cathode material |
| WO2014021154A1 (en) * | 2012-07-31 | 2014-02-06 | 東芝マテリアル株式会社 | Negative electrode for discharge lamp and method for manufacturing same |
| WO2014032925A1 (en) * | 2012-08-27 | 2014-03-06 | Osram Gmbh | High-pressure discharge lamp having electrodes that are provided with an electron emitter |
| JP2014186890A (en) * | 2013-03-25 | 2014-10-02 | Ushio Inc | Short arc discharge lamp |
| JPWO2013122081A1 (en) * | 2012-02-15 | 2015-05-11 | 株式会社東芝 | Cathode parts for discharge lamps |
| JP2016066447A (en) * | 2014-09-24 | 2016-04-28 | 日本タングステン株式会社 | Light emitting filament for transporting apparatus |
-
1991
- 1991-08-23 JP JP3235689A patent/JP2851727B2/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7098597B2 (en) | 2003-03-31 | 2006-08-29 | Ushiodenki Kabushiki Kaisha | Xenon lamp |
| JP2006257150A (en) * | 2005-03-15 | 2006-09-28 | Sekisui Plastics Co Ltd | Carbon-containing and styrene-modified polyethylene-based resin particle and expandable resin particle, method for producing such particles, preliminarily expanded particle and expanded molded form |
| US7569994B2 (en) | 2005-03-31 | 2009-08-04 | Ushio Denki Kabushiki Kaisha | High-load and high-intensity discharge lamp |
| JP2009259790A (en) * | 2008-03-26 | 2009-11-05 | Harison Toshiba Lighting Corp | High-pressure discharge lamp |
| US8758652B2 (en) | 2009-10-19 | 2014-06-24 | Nippon Tungsten Co., Ltd. | Tungsten cathode material |
| WO2011049049A1 (en) | 2009-10-19 | 2011-04-28 | 日本タングステン株式会社 | Tungsten cathode material |
| JP5379863B2 (en) * | 2009-10-19 | 2013-12-25 | 日本タングステン株式会社 | Discharge method |
| JP2012178329A (en) * | 2011-02-03 | 2012-09-13 | Ushio Inc | Negative electrode for discharge lamp |
| WO2012128303A1 (en) | 2011-03-23 | 2012-09-27 | 日本タングステン株式会社 | Tungsten cathode material |
| JPWO2013122081A1 (en) * | 2012-02-15 | 2015-05-11 | 株式会社東芝 | Cathode parts for discharge lamps |
| WO2014021154A1 (en) * | 2012-07-31 | 2014-02-06 | 東芝マテリアル株式会社 | Negative electrode for discharge lamp and method for manufacturing same |
| JPWO2014021154A1 (en) * | 2012-07-31 | 2016-07-21 | 東芝マテリアル株式会社 | Cathode for discharge lamp and method for producing the same |
| WO2014032925A1 (en) * | 2012-08-27 | 2014-03-06 | Osram Gmbh | High-pressure discharge lamp having electrodes that are provided with an electron emitter |
| JP2014186890A (en) * | 2013-03-25 | 2014-10-02 | Ushio Inc | Short arc discharge lamp |
| JP2016066447A (en) * | 2014-09-24 | 2016-04-28 | 日本タングステン株式会社 | Light emitting filament for transporting apparatus |
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| JP2851727B2 (en) | 1999-01-27 |
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