JP2001250504A - High-pressure discharge lamp - Google Patents
High-pressure discharge lampInfo
- Publication number
- JP2001250504A JP2001250504A JP2001038001A JP2001038001A JP2001250504A JP 2001250504 A JP2001250504 A JP 2001250504A JP 2001038001 A JP2001038001 A JP 2001038001A JP 2001038001 A JP2001038001 A JP 2001038001A JP 2001250504 A JP2001250504 A JP 2001250504A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- lamp
- discharge
- metal foil
- pressure
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
- H01J61/366—Seals for leading-in conductors
- H01J61/368—Pinched seals or analogous seals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/32—Sealing leading-in conductors
- H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device
- H01J9/326—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device making pinched-stem or analogous seals
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/32—Photonic crystals
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、点灯時、内圧が１
気圧以上になる高圧放電ランプの高耐圧化に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to increasing the pressure resistance of a high-pressure discharge lamp that is higher than the atmospheric pressure.
【０００２】[0002]
【従来の技術】従来、高圧放電ランプは、住宅、施設、
店舗等の一般照明用として広く使用されてきた。最近で
は、オーバーヘッドプロジェクターや、投射型テレビ、
映写機等の光源としても使用されてきている。それは、
高圧放電ランプが、高輝度の光放射をするためである。2. Description of the Related Art Conventionally, high pressure discharge lamps have been used in houses, facilities,
It has been widely used for general lighting in stores and the like. Recently, overhead projectors, projection TVs,
It has also been used as a light source for projectors and the like. that is,
This is because the high-pressure discharge lamp emits high-luminance light.
【０００３】特に近年、ランプからの演色性を向上する
とか、放電アークの長さを短くし、点光源に近付けよう
とする試みが盛んに研究されている。しかし、この時、
ランプ内圧を今まで以上に上げる必要が生じている。[0003] In particular, in recent years, various attempts have been made to improve the color rendering properties of lamps or to shorten the length of a discharge arc so as to approach a point light source. However, at this time,
There is a need to raise the lamp internal pressure more than ever.
【０００４】このランプ内圧が上昇するにともないラン
プの破損防止の対策が色々施されてきた。例えば、特開
平３−２０１３５７号公報の「高耐圧箔シール構造」等
がある。これによれば、金属箔を用いたシール部での軸
に垂直な断面において、金属箔とガラス管との未密着部
分の最大値をａ、その部分でのシール外径をｂとすると
き下記式（数１）を満足すること構成を取ることによ
り、耐圧性に優れた箔シール構造が得られる。 （ｂ−ａ）／ａ1.5＞１．４ （数１）As the internal pressure of the lamp increases, various measures have been taken to prevent damage to the lamp. For example, there is a "high-pressure-resistant foil sealing structure" in JP-A-3-201357. According to this, in the section perpendicular to the axis at the seal portion using the metal foil, the maximum value of the non-adhered portion between the metal foil and the glass tube is a, and the seal outer diameter at that portion is b, By adopting a configuration that satisfies the expression (Equation 1), a foil seal structure excellent in pressure resistance can be obtained. (Ba) / a 1.5 > 1.4 (Equation 1)
【０００５】[0005]
【発明が解決しようとする課題】前記の従来の発明にお
いては、(b-a)/ａ1.5の値で耐圧が決定されている。し
かし、耐圧は、(b-a)/ａ1.5の値のみでは決定されない
ことが検討により判った。例えば、(b-a)/ａ1.5を一定
にした場合にも、耐圧は放電ガラス管と電極シール部の
境の絞り内径に依存することが判った。In the conventional invention described above, the breakdown voltage is determined by the value of (ba) / a 1.5 . However, the withstand voltage was found by considering not be determined by only the value of (ba) / a 1.5. For example, even when (ba) / a 1.5 was fixed, it was found that the withstand voltage depends on the inner diameter of the diaphragm at the boundary between the discharge glass tube and the electrode seal portion.
【０００６】耐圧を向上する手段としては、放電ガラス
管と電極シール部の境の絞り内径を小さくしていけば良
いのであるが、放電ガラス管と電極シール部の境の絞り
内径は、ランプの光特性、寿命特性により決定されるラ
ンプ設計によって、決定される。というのは、電極形
状、金属箔形状は、ランプの電気特性、分光特性、寿命
特性に応じて設計される。例えば、電極が受ける電流値
を増やすにつれ、放電アークを保持している側の電極を
太く設計することは、電極設計上一般的手法である。そ
のため、ランプを直流点灯する場合は、陽電極の放電ア
ークを保持している側を太く設計したり、交流点灯の場
合においても、放電アークの長さを短くすると増加する
電流値に従って、放電アークを保持している側の電極を
太く設計したりする。特に、近年、市場からの要求によ
り放電アークの長さを短く傾向にあるのは前記してある
通りで、電極設計する上で、放電アークを保持している
側の電極を太くする傾向がある。ところで、電極をガラ
ス管に封止する製法は、以下の通りである。 （１）放電ガラス管部分を成形すると同時に放電ガラス
管と電極シール部の境部に絞り加工を行う。 （２）電極を放電ガラス管と電極シール部の境の絞り部
を通って放電ガラス管に挿入する。 （３）電極シール部のガラス管をバーナーで熱し、溶融
させ封止する。つまり、放電ガラス管と電極シール部の
境の絞り内径は、電極が通ることができうる径に規制さ
れるのである。In order to improve the withstand voltage, the inner diameter of the aperture at the boundary between the discharge glass tube and the electrode seal may be reduced. It is determined by lamp design determined by light characteristics and life characteristics. That is, the shape of the electrode and the shape of the metal foil are designed according to the electric characteristics, spectral characteristics, and life characteristics of the lamp. For example, it is a general technique in electrode design to increase the thickness of the electrode holding the discharge arc as the current value received by the electrode increases. Therefore, when the lamp is to be lit by direct current, the side of the positive electrode that holds the discharge arc is designed to be thicker. Or the electrode on the side that holds is made thicker. In particular, in recent years, as described above, the length of the discharge arc tends to be shorter due to market demands. In designing an electrode, the electrode holding the discharge arc tends to be thicker. . By the way, the manufacturing method of sealing the electrode in the glass tube is as follows. (1) At the same time as forming the discharge glass tube portion, drawing is performed at the boundary between the discharge glass tube and the electrode seal portion. (2) Insert the electrode into the discharge glass tube through the narrowed portion at the boundary between the discharge glass tube and the electrode seal portion. (3) The glass tube of the electrode seal portion is heated by a burner, melted and sealed. That is, the inner diameter of the diaphragm at the boundary between the discharge glass tube and the electrode seal portion is regulated to a diameter through which the electrode can pass.
【０００７】ところが、放電アークの長さを短くしてい
くにつれ封入水銀量を増加させるために、ランプの動作
圧は上昇する。そのため、その動作圧に耐えうる耐圧構
造を備えたランプにするためには、備えたい耐圧に応じ
て、放電ガラス管と電極シール部の境の絞り内径を小さ
くしなくてはならないが、上記の通り製造上規制される
ランプの設計上、その絞り内径は、とりえない場合があ
る。However, as the length of the discharge arc is shortened, the operating pressure of the lamp increases in order to increase the amount of mercury enclosed. Therefore, in order to provide a lamp having a pressure-resistant structure capable of withstanding the operating pressure, the inner diameter of the throttle at the boundary between the discharge glass tube and the electrode seal portion must be reduced in accordance with the required pressure resistance. Due to the design of the lamp that is regulated in manufacturing as described above, the inner diameter of the aperture may not be able to be obtained.
【０００８】したがって、従来の方式のなかでランプ特
性として要求されている種々の特性を得るためには、耐
圧設計上不十分になる場合が多々あった。[0008] Therefore, in order to obtain various characteristics required as lamp characteristics in the conventional system, there are many cases where it becomes insufficient in terms of withstand voltage design.
【０００９】本発明は、放電ガラス管と電極シール部の
境の絞り内径との関係による耐圧をさらに向上させ、耐
圧設計の幅を広げ、高圧放電ランプにおける安全性を高
めることを目的としている。SUMMARY OF THE INVENTION It is an object of the present invention to further improve the withstand voltage based on the relationship between the inner diameter of the diaphragm at the boundary between the discharge glass tube and the electrode seal portion, expand the range of withstand voltage design, and enhance the safety of the high-pressure discharge lamp.
【００１０】[0010]
【課題を解決するための手段】上記の課題を解決するた
めに、本発明の高圧放電ランプは、ランプの駆動装置に
接続するリード線と放電電極棒との間に金属箔を接続し
た高圧放電ランプであって、前記放電電極棒と前記金属
箔との接続部分で前記放電電極棒を前記金属箔で覆い、
前記放電電極棒の電極エッジが露出しない構成とし、さ
らに、前記金属箔の幅は、前記放電電極棒に接続した側
を前記リード線に接続した側より狭くしたことを特徴と
する。In order to solve the above-mentioned problems, a high-pressure discharge lamp according to the present invention comprises a high-pressure discharge lamp having a metal foil connected between a lead wire connected to a lamp driving device and a discharge electrode rod. A lamp, wherein the discharge electrode rod is covered with the metal foil at a connection portion between the discharge electrode rod and the metal foil,
The electrode edge of the discharge electrode bar is not exposed, and the width of the metal foil is smaller on the side connected to the discharge electrode bar than on the side connected to the lead wire.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態と参考
例について、図１〜図１０を用いて説明する。なお下記
の参考例１〜２は本発明の実施の形態を導き出すための
ものであり、請求の範囲とは無関係である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments and reference examples of the present invention will be described below with reference to FIGS. In addition, the following Reference Examples 1 and 2 are for deriving the embodiment of the present invention, and have nothing to do with the scope of the claims.
【００１２】（参考例１）図１は、高圧放電ランプの構
造の説明図である。図１において、１は全体を覆ってい
る放電ガラス管、２は外部引き出しリード線５をシール
するシール部、３は一定の距離を放電をさせるための放
電電極棒で、３'は電極棒の放電アークを保持している
側を示し、３”は電極棒のガラスと密着溶接されている
側を示す。４はリード線５と放電電極棒３を接続する金
属箔、６は放電ガラス管内と電極シール部の境の絞り部
分である。FIG. 1 is an explanatory view of the structure of a high-pressure discharge lamp. In FIG. 1, 1 is a discharge glass tube covering the whole, 2 is a sealing portion for sealing an external lead wire 5, 3 is a discharge electrode rod for discharging a predetermined distance, and 3 'is an electrode rod. The side holding the discharge arc is shown, 3 ″ is the side of the electrode rod which is closely welded to the glass. 4 is the metal foil connecting the lead wire 5 and the discharge electrode rod 3, and 6 is the inside of the discharge glass tube. This is a throttle portion at the boundary of the electrode seal portion.
【００１３】以上のように構成した高圧放電ランプにつ
いて、その耐圧が動作時にどう決定されるか以下に述べ
る。The following describes how the pressure resistance of the high-pressure discharge lamp configured as described above is determined during operation.
【００１４】図２は、ランプの耐圧特性を示す概念を説
明するためのものであり、図１におけるガラス管内とシ
ール部の境の絞り部分６の断面図である。７は電極棒３
とガラス１との未密着部で、その最長寸を2aとし、また
電極棒とガラス管との未密着部７において最も曲率半径
の小さい切り欠き部の曲率半径をρとする。そして、最
も曲率半径の小さい切り欠き部分での集中応力をPとす
ると、下記式（数２）が成り立つ。 Ｐ＝α×Ｐ0 （数２） ここで、αは下記式（数３）のとおりである（ただし、
αは集中応力係数、Ｐ 0は放電ガラス管の圧力を示
す）。 α＝２×（ａ／ρ）1/2 （数３） ここで、ランプの耐圧を模擬的に調べるために、以下の
様な実験を行った。図３は、耐圧測定用のランプであ
る。図３に示すように、ランプを試作する工程で、電極
をピンチングした後のサンプルにガラス細管８をつなげ
た。ガラス細管８から高圧ガスを導入し、破壊する圧力
を測定した。そのランプ破壊圧力をランプの耐圧とし
た。発光管の電極封止部でのａを予め測定したランプの
耐圧を調べた。FIG. 2 illustrates a concept showing the pressure resistance characteristics of the lamp.
This is for the sake of clarity.
It is sectional drawing of the throttle part 6 of the boundary of a rule part. 7 is an electrode rod 3
The longest dimension is 2a at the non-adhered portion between
The radius of curvature at the portion 7 where the electrode rod and the glass tube are not in close contact with each other
Let ρ be the radius of curvature of the notch portion having a small value. And the most
Also, let P be the concentrated stress at the notch with a small radius of curvature.
Then, the following equation (Equation 2) holds. P = α × P0 (Equation 2) Here, α is as shown in the following equation (Equation 3) (where,
α is the concentrated stress coefficient, P 0Indicates the pressure of the discharge glass tube
). α = 2 × (a / ρ)1/2 (Equation 3) Here, to simulate the breakdown voltage of the lamp,
Various experiments were performed. FIG. 3 shows a lamp for measuring pressure resistance.
You. As shown in FIG.
Connect the glass tube 8 to the sample after pinching
Was. Pressure at which high-pressure gas is introduced from the glass tube 8 and destroyed
Was measured. The lamp breakdown pressure is defined as the pressure resistance of the lamp.
Was. The value of a measured beforehand at the electrode sealing portion of the arc tube
The pressure resistance was examined.
【００１５】図４に、以上のようにして調べた放電ガラ
ス管に導入したガスによるランプ耐圧とａ-1/2との関係
を示す。図４より、式（１）でのＰ0とａ-1/2との関係
が成り立っていることが判る。電極棒径を細くし、ガラ
ス管内とシール部の境の絞り内径2aを小さくしていけば
耐圧が上がることが判る。しかし、ランプの所定の発光
特性をうるためには、アーク放電を受ける部分の電極棒
径を調整する必要があり、電極先端部は一般的には太く
する必要がある。そのため、アーク放電を受ける部分の
電極先端部は、ランプ特性として必要な電極棒径を用
い、電極シール部に向かうにしたがって、棒径を段階的
に細くしたり、テーパー形状にして、ランプ耐圧を上と
同様に測定した。例えば、図１の番号３のような電極棒
である。図１における電極棒３の先端のテーパー部は、
太い部分の直径が０．９ｍｍ、先端のテーパー部の先端
の直径が０．３ｍｍ、テーパー長さは８ｍｍである。FIG. 4 shows the relationship between the lamp withstand voltage due to the gas introduced into the discharge glass tube and a- 1 / 2, which was examined as described above. FIG. 4 shows that the relationship between P 0 and a −1/2 in equation (1) holds. It can be seen that the pressure resistance increases as the diameter of the electrode rod is reduced and the inner diameter 2a of the diaphragm at the boundary between the inside of the glass tube and the seal portion is reduced. However, in order to obtain a predetermined luminous characteristic of the lamp, it is necessary to adjust the diameter of the electrode rod at a portion to be subjected to arc discharge, and the tip of the electrode generally needs to be thick. For this reason, the electrode tip of the part that receives the arc discharge uses the required electrode rod diameter as the lamp characteristics, and gradually reduces the rod diameter or makes it tapered toward the electrode seal to reduce the lamp withstand voltage. Measured as above. For example, it is an electrode rod as indicated by reference numeral 3 in FIG. The tapered portion at the tip of the electrode rod 3 in FIG.
The diameter of the thick part is 0.9 mm, the diameter of the tip of the tapered part is 0.3 mm, and the length of the taper is 8 mm.
【００１６】測定結果を図５に示す。図５の線Ａは、電
極の径に変化のないストレート電極棒を用い測定した。
図５の線Ｂは、電極棒をテーパー形状にして、測定し
た。テーパ形状電極とストレート形状電極とを比較する
と、テーパー形状電極（線Ｂ）の方が、耐圧が１０〜３
０％向上することが判った。このとき、ガラス管内とシ
ール部の境のしぼり部分６の断面における電極棒径は、
テーパー形状電極と同一にしている。FIG. 5 shows the measurement results. The line A in FIG. 5 was measured using a straight electrode rod having no change in the diameter of the electrode.
The line B in FIG. 5 was measured with the electrode rod having a tapered shape. Comparing the tapered electrode and the straight electrode, the withstand voltage of the tapered electrode (line B) is 10 to 3
It was found to be improved by 0%. At this time, the diameter of the electrode rod in the cross section of the squeezed portion 6 at the boundary between the inside of the glass tube and the seal portion is:
It is the same as the tapered electrode.
【００１７】また、電極棒の電極封止部を階段状に径を
変化させた電極でも、同様の実験を行った。用いた階段
状電極棒１１を図６に示す。この階段状に径を変化させ
た電極１１は、一番太い部分の直径が０．９ｍｍで、長
さ３ｍｍごとに直径が０．２ｍｍづつ段階的に３段で細
くなり、一番細い部分直径は０．３ｍｍであった。A similar experiment was conducted with an electrode in which the diameter of the electrode sealing portion of the electrode rod was changed stepwise. FIG. 6 shows the stepped electrode rod 11 used. The electrode 11 whose diameter is changed stepwise has a diameter of the thickest part of 0.9 mm, and becomes thinner in three steps in steps of 0.2 mm in diameter for every 3 mm in length. Was 0.3 mm.
【００１８】この階段状に径を変化させた電極１１にお
ける実験においても、テーパー形状電極とほぼ同様に、
ストレート形状電極に比べ、１０〜３０％耐圧が向上す
る事が判った。In the experiment with the electrode 11 having the diameter changed stepwise, almost the same as the tapered electrode,
It was found that the pressure resistance was improved by 10 to 30% as compared with the straight electrode.
【００１９】（参考例２）ガラス管中に電極を封止した
後のランプを観察すると、ガラス中にクラックが図７の
番号１２のように生じる。図７は、電極棒と金属箔の溶
接部付近の電極シール部拡大図である。このクラック１
２は、ガラスと金属箔および電極棒との熱膨張係数の差
により生じている。通常発光管を形成している石英ガラ
スと金属箔及び電極棒との熱膨張係数はおおよそ１桁異
なる。例えば、石英ガラスが5.5×10-7であるのに対
し、モリブデンは5.2×10-6、タングステンは4.4×10-6
である。これらの値は、1000℃以下の低温域での線膨張
係数であるが、高温域においても石英ガラスに対して、
金属箔および電極との熱膨張係数が桁違いの差であるこ
とは容易に推測される。石英ガラス中に金属箔および電
極を封止する製法は、石英ガラス管中に電極を仮固定
し、石英ガラス管を外部よりバーナーで熱し、石英ガラ
ス管を溶融し、仮固定してある電極を封止する。封止し
た後、室温で放置すれば、石英ガラスと封止された電極
は、徐冷される。その際、上記の通り石英ガラスと金属
箔および電極との熱膨張は大きく異なるため、石英中
に、応力を緩和するためのクラックが図７のように生じ
る。このクラック１２は金属箔のエッジ部分から電極棒
を囲む様に成長する。このクラックはランプ点灯中破壊
モードを引き起こすより、リークモードに至ることが多
い。Reference Example 2 Observation of the lamp after sealing the electrodes in a glass tube reveals cracks in the glass as indicated by numeral 12 in FIG. FIG. 7 is an enlarged view of an electrode seal portion near a welded portion between the electrode rod and the metal foil. This crack 1
2 is caused by the difference in the thermal expansion coefficient between the glass, the metal foil and the electrode rod. Normally, the thermal expansion coefficients of quartz glass, metal foil, and electrode rods that form an arc tube differ by about one digit. For example, quartz glass is 5.5 × 10 -7 , while molybdenum is 5.2 × 10 -6 and tungsten is 4.4 × 10 -6
It is. These values are linear expansion coefficients in the low temperature range of 1000 ° C or less, but even in the high temperature range,
It is easily assumed that the thermal expansion coefficients of the metal foil and the electrode are orders of magnitude different. The method of sealing the metal foil and the electrode in quartz glass is to temporarily fix the electrode in a quartz glass tube, heat the quartz glass tube with a burner from the outside, melt the quartz glass tube, and remove the temporarily fixed electrode. Seal. If left at room temperature after sealing, the quartz glass and the sealed electrode are gradually cooled. At that time, as described above, since the thermal expansion of the quartz glass is significantly different from that of the metal foil and the electrode, cracks for relaxing the stress are generated in the quartz as shown in FIG. The crack 12 grows from the edge of the metal foil so as to surround the electrode rod. This crack often leads to a leak mode rather than causing a breakdown mode during lamp operation.
【００２０】これを防止するため、このクラックが発生
するきっかけを作っている金属箔のエッジ部分を除去す
る目的で、図８に示すような三角形型の金属箔１３を準
備し、しかもエッジ部分は飛行機の翼のように、流線型
状にした。前記三角形型の金属箔１３のディメンジョン
は、底辺に相当する部分の長さが２．５ｍｍ、高さに相
当する部分の長さが３ｍｍである。このような箔形状で
封止したランプの耐圧は図９の線Ｃに示した。図９の線
Ｄは一般的な長方形状金属箔で封止したランプの耐圧で
ある。流線型状金属箔を用いて封止したランプの耐圧
は、長方形状金属箔を用いて封止したランプの耐圧と比
較して２０％前後向上していることがわかる。In order to prevent this, a triangular-shaped metal foil 13 as shown in FIG. 8 is prepared for the purpose of removing the edge of the metal foil which has caused the crack to occur. It was streamlined, like the wings of an airplane. The dimension of the triangular metal foil 13 is 2.5 mm in length corresponding to the base and 3 mm in length corresponding to the height. The pressure resistance of the lamp sealed with such a foil shape is shown by line C in FIG. The line D in FIG. 9 is the withstand voltage of the lamp sealed with a general rectangular metal foil. It can be seen that the withstand voltage of the lamp sealed with the streamlined metal foil is improved by about 20% as compared with the withstand voltage of the lamp sealed with the rectangular metal foil.
【００２１】（実施の形態１）さらに、破壊の様子を詳
細に観察するために以下の実験を行った。あらかじめ試
験サンプル用ランプの放電ガラス管と電極シール部の境
の絞り内径からそのランプの耐圧を予測し、ランプに予
測した耐圧力の10%減の高圧ガスを封入することによ
り、破壊寸前のランプを得た。このランプを観察するこ
とより、ランプを破壊させる傷は、溶接部の電極棒と金
属箔の段差部から成長するものと、箔のエッジから成長
するものが、衝突することにより成長することが判っ
た。このような傷の成長は、目視では判りにくいため、
ランプにインクを注入し、時間をかけて傷にインクを浸
透させて、観察を行った。その写真のトレース図を図１
０に示す。これらの観察により、溶接部の電極棒と金属
箔の段差部から成長している傷１０を小さくすることに
より、耐圧が向上することが判った。(Embodiment 1) Further, the following experiment was conducted to observe the state of destruction in detail. Predict the withstand pressure of the lamp from the inner diameter of the throttle at the boundary between the discharge glass tube and the electrode seal of the test sample lamp, and fill the lamp with a high-pressure gas that is 10% less than the predicted withstand pressure, so that the lamp is about to break. I got By observing this lamp, it was found that the damage that destroys the lamp grows from the electrode rod of the weld and the step between the metal foil and the one growing from the edge of the foil by collision. Was. Since the growth of such a wound is difficult to see visually,
The lamp was injected with ink, and the ink was allowed to penetrate the wound over time, and observation was performed. Figure 1 shows the trace of the photograph.
0 is shown. From these observations, it was found that the pressure resistance was improved by reducing the size of the scratch 10 growing from the step between the electrode rod and the metal foil at the welded portion.
【００２２】そこで、この電極溶接部分の電極棒と金属
箔との段差をなくし、段差部から成長している傷を減ら
すために、図１１のように、電極棒３がむき出しの部分
に金属箔４を被覆し、電極棒３の電極エッジが露出しな
い構成とし、一端を外部引き出しリード線に接続した。
その結果、電極棒３と金属箔との溶接部４において、電
極棒と金属箔との段差がなく、電極棒と金属箔が一体化
した。そして、ガラス管との封止後も、電極棒の先より
成長していた傷が小さくなった。また、上記構成のラン
プにおいて耐圧試験を行った結果、従来の構成のものと
比較し、耐圧が３０％も向上することがわかった。Therefore, in order to eliminate the step between the electrode rod and the metal foil at the electrode welding portion and to reduce the scratches growing from the step, as shown in FIG. 4 was covered so that the electrode edge of the electrode rod 3 was not exposed, and one end was connected to an external lead wire.
As a result, in the welded portion 4 between the electrode rod 3 and the metal foil, there was no step between the electrode rod and the metal foil, and the electrode rod and the metal foil were integrated. Then, even after sealing with the glass tube, the damage that had grown from the tip of the electrode rod was reduced. In addition, as a result of a pressure resistance test performed on the lamp having the above configuration, it was found that the pressure resistance was improved by 30% as compared with that of the conventional configuration.
【００２３】[0023]
【発明の効果】以上のように本発明によれば、放電ガラ
ス管と電極シール部の境の絞り内径との関係による耐圧
をさらに向上させ、耐圧設計の幅を広げ、高圧放電ラン
プにおける安全性を高めるという顕著な効果が得られ
る。As described above, according to the present invention, the withstand voltage due to the relationship between the inner diameter of the diaphragm at the boundary between the discharge glass tube and the electrode seal portion is further improved, the range of the withstand voltage design is expanded, and the safety in the high-pressure discharge lamp is improved. And a remarkable effect of increasing the
【図１】参考例１によるテーパー形状の電極棒を備えた
高圧放電ランプの構成を示す断面図。FIG. 1 is a cross-sectional view showing a configuration of a high-pressure discharge lamp including a tapered electrode bar according to Reference Example 1.
【図２】同、高圧放電ランプの放電ガラス管内と電極シ
ール部境部分の断面図。FIG. 2 is a cross-sectional view of the inside of a discharge glass tube of the high-pressure discharge lamp and a boundary portion of an electrode seal.
【図３】同、耐圧測定用のランプの構成を示す断面図。FIG. 3 is a cross-sectional view showing a configuration of a lamp for withstand voltage measurement.
【図４】同、ランプ耐圧と、放電ガラス管内と電極シー
ル部境部分の電極棒とガラス未密着部の最長寸の相関を
示す図。FIG. 4 is a diagram showing a correlation between the lamp withstand voltage and the longest dimension of the electrode rod and the glass non-contact portion at the boundary between the inside of the discharge glass tube and the electrode seal portion.
【図５】同、ストレート形状電極棒を用いて封止したラ
ンプとテーパー形状電極棒を用いて封止したランプのラ
ンプ耐圧の特性差を示す図。FIG. 5 is a diagram showing a difference in lamp breakdown voltage between a lamp sealed with a straight electrode rod and a lamp sealed with a tapered electrode rod.
【図６】同、階段形状の電極棒を備えた電極の構成を示
す図。FIG. 6 is a diagram showing a configuration of an electrode provided with an electrode rod having a staircase shape.
【図７】参考例２の電極棒と金属箔の溶接部付近の電極
シール部拡大図FIG. 7 is an enlarged view of an electrode seal portion in the vicinity of a welded portion between an electrode rod and a metal foil of Reference Example 2.
【図８】同、流線型状金属箔を備えた電極の構成を示す
図。FIG. 8 is a diagram showing a configuration of an electrode including a streamlined metal foil.
【図９】同、長方形状金属箔を用いて封止したランプと
流線型状金属箔を用いて封止したランプのランプ耐圧の
特性差を示す図。FIG. 9 is a diagram showing a difference in lamp withstand voltage characteristics between a lamp sealed with a rectangular metal foil and a lamp sealed with a streamlined metal foil.
【図１０】本発明の第１の実施の形態で行ったランプの
破壊にいたる傷の成長を示すトレース図。FIG. 10 is a trace diagram showing the growth of a flaw leading to the destruction of the lamp performed in the first embodiment of the present invention.
【図１１】本発明の第１の実施の形態による、金属箔と
電極棒の溶接部において、金属箔で覆った電極棒端を備
えた電極の構成を示す図。FIG. 11 is a view showing a configuration of an electrode having an electrode rod end covered with a metal foil at a welded portion between the metal foil and the electrode rod according to the first embodiment of the present invention.
１ 放電ガラス管 ２ シール部 ３ 放電電極棒 ３' 電極棒の放電アークを保持している側 ３” 電極棒のガラスと密着溶接されている側 ４ 金属箔 ５ 外部引き出しリード線 ６ 放電ガラス管内と電極シール部の境の絞り部分 ７ 電極棒とガラスとの未密着部 ８ ガラス細管 １０ 溶接部の電極棒と金属箔の段差部から成長してい
る傷 １１ 階段状に径を変化させた電極 １２ クラック １３ 三角形型の金属箔DESCRIPTION OF SYMBOLS 1 Discharge glass tube 2 Seal part 3 Discharge electrode rod 3 'The side which holds the discharge arc of the electrode rod 3 "The side of the electrode rod which is tightly welded to glass 4 Metal foil 5 External lead wire 6 Inside the discharge glass tube The narrowed portion at the border of the electrode seal portion 7 The non-adhesive portion between the electrode rod and the glass 8 The thin glass tube 10 The flaw growing from the stepped portion between the electrode rod of the welded portion and the metal foil 11 The electrode whose diameter is changed stepwise 12 Crack 13 triangular metal foil
フロントページの続き (72)発明者 甲斐 誠 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 竹田 守 大阪府門真市大字門真1006番地 松下電器 産業株式会社内Continued on the front page (72) Inventor Makoto Kai, 1006 Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd.
Claims (1)
電電極棒との間に金属箔を接続した高圧放電ランプであ
って、前記放電電極棒と前記金属箔との接続部分で前記
放電電極棒を前記金属箔で覆い、前記放電電極棒の電極
エッジが露出しない構成とし、さらに、前記金属箔の幅
は、前記放電電極棒に接続した側を前記リード線に接続
した側より狭くした高圧放電ランプ。1. A high-pressure discharge lamp in which a metal foil is connected between a lead wire connected to a lamp driving device and a discharge electrode rod, wherein the discharge electrode is connected at a connection portion between the discharge electrode rod and the metal foil. The rod is covered with the metal foil so that the electrode edge of the discharge electrode rod is not exposed, and the width of the metal foil is smaller at the side connected to the discharge electrode bar than at the side connected to the lead wire. Discharge lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001038001A JP2001250504A (en) | 2001-12-13 | 2001-02-15 | High-pressure discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001038001A JP2001250504A (en) | 2001-12-13 | 2001-02-15 | High-pressure discharge lamp |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9681497A Division JPH10289690A (en) | 1997-04-15 | 1997-04-15 | High-pressure discharge lamp |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003060561A Division JP2003234087A (en) | 2003-03-06 | 2003-03-06 | High-pressure discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001250504A true JP2001250504A (en) | 2001-09-14 |
Family
ID=28034750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001038001A Pending JP2001250504A (en) | 2001-12-13 | 2001-02-15 | High-pressure discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001250504A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1308987A2 (en) * | 2001-10-19 | 2003-05-07 | Ushiodenki Kabushiki Kaisha | Super-high pressure discharge lamp of the short arc type |
| EP1343196A2 (en) * | 2002-03-05 | 2003-09-10 | Ushiodenki Kabushiki Kaisha | Ultrahigh pressure discharge lamp of the short arc type |
| US6693379B2 (en) | 2001-12-20 | 2004-02-17 | Nec Corporation | High-pressure discharge lamp and method of fabricating same |
| WO2008023492A1 (en) * | 2006-08-23 | 2008-02-28 | Panasonic Corporation | High-pressure discharge lamp manufacturing method, high-pressure discharge lamp, lamp unit, and projection image display |
| WO2009011117A1 (en) * | 2007-07-17 | 2009-01-22 | Panasonic Corporation | High pressure discharge lamp, lamp unit employing the high pressure discharge lamp, and projection image display employing the lamp unit |
| JP2010129426A (en) * | 2008-11-28 | 2010-06-10 | Panasonic Corp | High-pressure discharge lamp, lamp unit using this high-pressure discharge lamp, and projector using this lamp unit |
| JP2013229115A (en) * | 2012-04-24 | 2013-11-07 | Ushio Inc | High voltage discharge lamp |
-
2001
- 2001-02-15 JP JP2001038001A patent/JP2001250504A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1308987A3 (en) * | 2001-10-19 | 2006-05-17 | Ushiodenki Kabushiki Kaisha | Super-high pressure discharge lamp of the short arc type |
| EP1308987A2 (en) * | 2001-10-19 | 2003-05-07 | Ushiodenki Kabushiki Kaisha | Super-high pressure discharge lamp of the short arc type |
| US6693379B2 (en) | 2001-12-20 | 2004-02-17 | Nec Corporation | High-pressure discharge lamp and method of fabricating same |
| US6875072B2 (en) | 2001-12-20 | 2005-04-05 | Nec Corporation | High-pressure discharge lamp and method of fabricating same |
| EP1343196A2 (en) * | 2002-03-05 | 2003-09-10 | Ushiodenki Kabushiki Kaisha | Ultrahigh pressure discharge lamp of the short arc type |
| EP1343196A3 (en) * | 2002-03-05 | 2006-03-29 | Ushiodenki Kabushiki Kaisha | Ultrahigh pressure discharge lamp of the short arc type |
| JP4588784B2 (en) * | 2006-08-23 | 2010-12-01 | パナソニック株式会社 | High pressure discharge lamp manufacturing method, high pressure discharge lamp, lamp unit, and projection-type image display device |
| WO2008023492A1 (en) * | 2006-08-23 | 2008-02-28 | Panasonic Corporation | High-pressure discharge lamp manufacturing method, high-pressure discharge lamp, lamp unit, and projection image display |
| US8203267B2 (en) | 2006-08-23 | 2012-06-19 | Panasonic Corporation | Method for manufacturing high-pressure discharge lamp, high-pressure discharge lamp, lamp unit and projection-type image display |
| JPWO2008023492A1 (en) * | 2006-08-23 | 2010-01-07 | パナソニック株式会社 | High pressure discharge lamp manufacturing method, high pressure discharge lamp, lamp unit, and projection-type image display device |
| JP2009043701A (en) * | 2007-07-17 | 2009-02-26 | Panasonic Corp | High-pressure discharge lamp, lamp unit using it, and projection image display using lamp unit |
| JP4724193B2 (en) * | 2007-07-17 | 2011-07-13 | パナソニック株式会社 | High pressure discharge lamp, lamp unit using the same, and projection type image display device using the lamp unit |
| WO2009011117A1 (en) * | 2007-07-17 | 2009-01-22 | Panasonic Corporation | High pressure discharge lamp, lamp unit employing the high pressure discharge lamp, and projection image display employing the lamp unit |
| US8207673B2 (en) | 2007-07-17 | 2012-06-26 | Panasonic Corporation | High-pressure discharge lamp, lamp unit using the same, and projection-type image display device using the lamp unit |
| JP2010129426A (en) * | 2008-11-28 | 2010-06-10 | Panasonic Corp | High-pressure discharge lamp, lamp unit using this high-pressure discharge lamp, and projector using this lamp unit |
| JP2013229115A (en) * | 2012-04-24 | 2013-11-07 | Ushio Inc | High voltage discharge lamp |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6132279A (en) | High-pressure discharge lamp and manufacturing method thereof | |
| JP4681668B2 (en) | Foil seal lamp | |
| JP2001250504A (en) | High-pressure discharge lamp | |
| US6693379B2 (en) | High-pressure discharge lamp and method of fabricating same | |
| JPH10289690A (en) | High-pressure discharge lamp | |
| JP2008181716A (en) | Discharge lamp and lighting system | |
| JP4358729B2 (en) | Short arc type discharge lamp | |
| US7176631B2 (en) | Ultra high pressure discharge lamp | |
| JP2009193768A (en) | Short arc high-pressure discharge lamp | |
| JP2003234087A (en) | High-pressure discharge lamp | |
| JP2004335457A (en) | High pressure discharge lamp | |
| CN101414540B (en) | Extra-high pressure discharge lamp | |
| JPH0589839A (en) | Welds for bulb | |
| JP2002270133A (en) | Electrode for very high pressure discharge lamp and very high pressure discharge lamp using the electrode | |
| US20090115303A1 (en) | Electric lamp having an outer bulb | |
| JP3385810B2 (en) | Metal halide lamp | |
| EP2963671A1 (en) | Socket and discharge lamp comprising said socket | |
| JP5194377B2 (en) | Discharge lamp and discharge lamp device | |
| JP4007106B2 (en) | Short arc type ultra high pressure discharge lamp | |
| JPH10112287A (en) | Thin tube fluorescent lamp | |
| JPS62115644A (en) | High pressure discharge lamp | |
| JP3405001B2 (en) | Metal halide lamp | |
| JP2003092082A (en) | Short arc type mercury discharge lamp | |
| US20060061284A1 (en) | Double-bulb lamp | |
| JP2001160374A (en) | Short-arc ultra-pressure discharge lamp |