JP5840432B2 - Discharge lamp - Google Patents

Discharge lamp Download PDF

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JP5840432B2
JP5840432B2 JP2011206382A JP2011206382A JP5840432B2 JP 5840432 B2 JP5840432 B2 JP 5840432B2 JP 2011206382 A JP2011206382 A JP 2011206382A JP 2011206382 A JP2011206382 A JP 2011206382A JP 5840432 B2 JP5840432 B2 JP 5840432B2
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foil
electrode
tube
glass tube
support rod
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JP2013069506A (en
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小川　正明
正明 小川
唯介 今井
唯介 今井
宮下　信一
信一 宮下
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Orc Manufacturing Co Ltd
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Orc Manufacturing Co Ltd
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Priority to TW101119057A priority patent/TWI587356B/en
Priority to KR1020120076003A priority patent/KR101895620B1/en
Priority to CN201210258716.2A priority patent/CN103021791B/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/50—Auxiliary parts or solid material within the envelope for reducing risk of explosion upon breakage of the envelope, e.g. for use in mines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
    • 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
    • H01J61/361—Seals between parts of vessel

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  • Vessels And Coating Films For Discharge Lamps (AREA)

Description

本発明は、発光管両端に連設される封止管内に電極保持構造を設けた放電ランプに関し、特に、放電ランプの封止構造に関する。   The present invention relates to a discharge lamp in which an electrode holding structure is provided in a sealing tube connected to both ends of an arc tube, and more particularly to a sealing structure for a discharge lamp.

ショートアーク型等の放電ランプでは、電極を封じた発光管の両端にガラス製の封止管が一体的に形成されており、封止管内では、電極を支持する電極支持棒が筒状ガラス管によって保持される。金属箔による封止構造では、封止管を熱によって縮径させ、封止管をガラス管と溶着させる。これにより、金属箔が封着され、発光管内が気密状態になる。   In a discharge lamp such as a short arc type, a glass sealing tube is integrally formed at both ends of an arc tube sealed with an electrode, and an electrode support rod for supporting the electrode is a cylindrical glass tube in the sealing tube. Held by. In the sealing structure with metal foil, the diameter of the sealing tube is reduced by heat, and the sealing tube is welded to the glass tube. Thereby, metal foil is sealed and the inside of an arc_tube | light_emitting_tube becomes an airtight state.

半導体、液晶製造分野では、生産効率を向上させるため、ショートアーク型放電ランプの大電力化が進んでいる。そのため、定格電力の大きな放電ランプでは、電極支持棒に金属リングなどの環状部材を固定させ、複数の金属箔を環状部材に溶着させる。そして、金属箔、環状部材、電極支持棒を介して電力が電極に供給される（例えば、特許文献１参照）。   In the semiconductor and liquid crystal manufacturing fields, in order to improve production efficiency, the power of short arc type discharge lamps is increasing. Therefore, in a discharge lamp having a large rated power, an annular member such as a metal ring is fixed to the electrode support rod, and a plurality of metal foils are welded to the annular member. And electric power is supplied to an electrode via metal foil, an annular member, and an electrode support rod (for example, refer patent document 1).

金属リングなどの熱膨張率は、ガラス管と異なる。そのため、封止工程でガラス管に封止管を溶着させると、環状部材とガラス管の接触面付近に歪みが生じ、この歪みがランプ破裂の原因となる。このような歪みの発生を防ぐため、例えば、環状部材の両面に同じ寸法同サイズの金属製円板箔を配置させ、ガラス部材と環状部材との溶着を防ぐ（特許文献２、３参照）。   The coefficient of thermal expansion of a metal ring or the like is different from that of a glass tube. Therefore, when the sealing tube is welded to the glass tube in the sealing step, distortion occurs in the vicinity of the contact surface between the annular member and the glass tube, and this distortion causes the lamp to burst. In order to prevent the occurrence of such distortion, for example, metal disk foils of the same size and the same size are arranged on both surfaces of the annular member to prevent welding between the glass member and the annular member (see Patent Documents 2 and 3).

また、ガラスから成る封止管と金属リングが接触すると、封止工程において径方向熱膨張率の違いから封止管に応力がかかる。そのため、金属リングを覆うように巻き箔を設け、金属リングが封止管と接触するのを防ぐ（特許文献４参照）。巻き箔は金属リング周りだけを覆い、巻き箔の電極側端部は金属リングを超えず、電極側ガラス管まで延びていない。   Further, when the sealing tube made of glass and the metal ring come into contact with each other, stress is applied to the sealing tube due to the difference in the radial thermal expansion coefficient in the sealing process. Therefore, winding foil is provided so that a metal ring may be covered, and it prevents that a metal ring contacts a sealing tube (refer patent document 4). The wound foil covers only around the metal ring, and the electrode side end of the wound foil does not exceed the metal ring and does not extend to the electrode side glass tube.

特開２００７−１１５４１４号公報JP 2007-115414 A 特開平８−３１５７８０号公報JP-A-8-315780 特開２０００−５８０００号公報JP 2000-58000 A 特開２０１０−１９８９４７号公報JP 2010-198947 A

ガラス管、金属リング等は、加工作業において面取り作業などを行なうため、その周縁部分は僅かに丸みを帯びている。そのため、封止工程後に、金属リング、電極側ガラス管、封止管との間には微小な隙間が生じる。この隙間は、ガラスを熱して軟化させることにより成形されるので、その形状は安定せず、電極側ガラス管と封止管との間にクサビ状の隙間が生じやすい。   Since glass tubes, metal rings, and the like perform chamfering operations and the like in processing operations, the peripheral portions thereof are slightly rounded. Therefore, a minute gap is generated between the metal ring, the electrode side glass tube, and the sealing tube after the sealing step. Since this gap is formed by heating and softening the glass, its shape is not stable, and a wedge-like gap is likely to occur between the electrode side glass tube and the sealing tube.

この隙間の圧力は、電極支持棒、金属リングとガラス管、封止管との間で完全な密着状態にならないことから、放電空間内圧力と等しくなる。そのため、ランプ点灯時に、金属リングと電極側ガラス管との径方向熱膨張率の違いによって応力が生じると、クサビ状の隙間部分からクラックが発生し、封止管の破裂を招く恐れがある。   The pressure in the gap is equal to the pressure in the discharge space because the electrode support rod, the metal ring and the glass tube, and the sealing tube are not completely in close contact with each other. For this reason, if a stress is generated due to the difference in the thermal expansion coefficient between the metal ring and the electrode side glass tube when the lamp is lit, cracks may be generated from the wedge-shaped gap portion and the sealing tube may be ruptured.

したがって、熱膨張率の差によって生じる応力に起因した封止管の破裂を防ぐことが必要とされる。   Therefore, it is necessary to prevent the sealing tube from bursting due to the stress caused by the difference in thermal expansion coefficient.

本発明の放電ランプは、発光管内の電極を支持する電極支持棒と、電極支持棒が挿通され、石英ガラスなどから成る封止管と溶着するガラス管と、電極支持棒が接続され、軸方向に沿って配設された金属箔と電極支持棒とを電気的に接続させる導電性円板部材とを備える。   The discharge lamp of the present invention includes an electrode support rod that supports an electrode in the arc tube, an electrode support rod that is inserted, a glass tube that is welded to a sealing tube made of quartz glass and the like, and an electrode support rod that is connected in an axial direction. And a conductive disc member for electrically connecting the metal foil and the electrode support bar disposed along the line.

例えば、放電ランプはショートアーク型放電ランプとして構成される。導電性円板部材としては、ここでは穴のない板上部材あるいは穴のある環状部材を構成することが可能であり、例えば金属リングなどを電極支持棒に挿通させる。   For example, the discharge lamp is configured as a short arc type discharge lamp. Here, as the conductive disk member, it is possible to constitute a plate member without a hole or an annular member with a hole. For example, a metal ring or the like is inserted through the electrode support rod.

導電性円板部材とガラス管との間には、円板箔を接触配置させ、電極支持棒が円板箔に挿通するようにしてもよい。例えば、円板箔は、薄い金属箔によって構成することができる。   A disc foil may be placed in contact between the conductive disc member and the glass tube so that the electrode support rod is inserted into the disc foil. For example, the disc foil can be constituted by a thin metal foil.

本発明の放電ランプは、導電性円板部材の外周面を覆う金属箔等の巻き箔を備える。そして、巻き箔の電極側端部は、軸方向に沿って金属箔端部および導電性円板部材よりも電極側に位置する。   The discharge lamp of the present invention includes a wound foil such as a metal foil covering the outer peripheral surface of the conductive disk member. And the electrode side edge part of winding foil is located in an electrode side rather than a metal foil edge part and an electroconductive disc member along an axial direction.

本発明では、巻き箔が金属箔さらには導電性円板部材を超えてガラス管にまで延びており、巻き箔の電極側端部（周縁部）は、導電性円板部材の外周面の軸方向範囲に収まらない。これにより、ガラス管と導電性円板部材の熱膨張率の差によって応力が生じても、ガラス管と導電性円板部材との境界部分で発生する応力が、可撓性があって柔軟性のある巻き箔によって吸収される。   In the present invention, the wound foil extends to the glass tube beyond the metal foil or the conductive disc member, and the electrode side end portion (peripheral portion) of the wound foil is the axis of the outer peripheral surface of the conductive disc member. It does not fit in the direction range. As a result, even if stress is generated due to the difference in thermal expansion coefficient between the glass tube and the conductive disk member, the stress generated at the boundary between the glass tube and the conductive disk member is flexible and flexible. It is absorbed by the wound foil.

特に、面取り加工などを行なうと、導電性円板部材、封止管、そしてガラス管との間に隙間、空隙が周方向に沿って形成される。しかしながら、巻き箔が露出している構成であれば、放電空間内の圧力が空隙に通じていても、封止管に直接応力がかかるのを防ぐことができる。また、面取り加工に関係なく、円板箔を設けた場合にも大きな空隙、隙間が形成されるが、巻き箔によって封止管に応力が集中することを防ぐことができる。   In particular, when chamfering or the like is performed, gaps and voids are formed along the circumferential direction between the conductive disk member, the sealing tube, and the glass tube. However, as long as the wound foil is exposed, it is possible to prevent stress from being directly applied to the sealed tube even when the pressure in the discharge space is communicated with the gap. Regardless of the chamfering process, large gaps and gaps are also formed when the disc foil is provided, but the concentrated foil can prevent stress from being concentrated on the sealing tube.

また、巻き箔の電極側端部が、径方向に沿って導電性円板部材外周面よりも軸側に位置する、すなわち、巻き箔の電極側端部が軸側に近付くように構成することができる。これによって、封止工程において、巻き箔の電極側端部が封止管外周側に向かって入り込む構成となることを防ぎ、封止管へ応力が集中することによるクラック発生を確実に防ぐ。   Further, the electrode side end of the wound foil is positioned on the axial side of the outer peripheral surface of the conductive disk member along the radial direction, that is, the electrode side end of the wound foil is configured to approach the axis side. Can do. Thus, in the sealing step, the electrode side end of the wound foil is prevented from entering toward the outer peripheral side of the sealing tube, and cracks due to concentration of stress on the sealing tube are reliably prevented.

一方、本発明の他の局面による放電ランプは、封止管端部側の封止構造を特徴とし、外部の電源と電気的に接続された棒（ここでは、リード棒という）と、前記リード棒が挿通され、封止管と溶着するガラス管と、前記リード棒が接続され、軸方向に沿って配設された金属箔と前記リード棒とを電気的に接続させる導電性円板部材と、前記導電性円板部材の外周面を覆う巻き箔とを備え、前記巻き箔の電極反対側端部が、軸方向に沿って前記金属箔の端部および前記導電性円板部材よりも電極反対側に位置することを特徴とする。   On the other hand, a discharge lamp according to another aspect of the present invention is characterized by a sealing structure on the end side of the sealing tube, and a rod (herein referred to as a lead rod) electrically connected to an external power source, and the lead A glass tube that is inserted through the rod and welded to the sealing tube; a conductive disc member that is connected to the lead rod and electrically connects the lead rod and the metal foil disposed along the axial direction; And a coiled foil covering the outer peripheral surface of the conductive disk member, and the electrode opposite side end of the wound foil is more electrode than the end of the metal foil and the conductive disk member along the axial direction. It is located on the opposite side.

本発明によれば、点灯中、封止管においてクラックが発生するのを防ぎ、信頼性の高い封止構造をもった放電ランプを得ることができる。   According to the present invention, it is possible to prevent a crack from being generated in a sealing tube during lighting, and to obtain a discharge lamp having a highly reliable sealing structure.

本実施形態であるショートアーク型放電ランプの概略的断面図である。It is a schematic sectional drawing of the short arc type discharge lamp which is this embodiment. 陽極側封止管の概略的断面図である。It is a schematic sectional drawing of an anode side sealing tube. 図２の内側金属リング付近を拡大して示した断面図である。It is sectional drawing which expanded and showed the inner side metal ring vicinity of FIG. 図３の外側巻き箔付近を拡大して示した図である。It is the figure which expanded and showed the outer side winding foil vicinity of FIG.

以下では、図面を参照して本発明の実施形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本実施形態であるショートアーク型放電ランプの概略的断面図である。図２は、陽極側封止管の概略的断面図である。   FIG. 1 is a schematic cross-sectional view of a short arc type discharge lamp according to this embodiment. FIG. 2 is a schematic cross-sectional view of the anode side sealing tube.

ショートアーク型放電ランプ１０は、石英ガラスから成る球状発光管１２内に陽極１４、陰極１６を対向配置させたランプであり、発光管１２の両端には、石英ガラスの封止管２０、６０が対向するように連設されている。封止管２０、６０の両端は、口金８０Ａ、８０Ｂで塞がれている。   The short arc type discharge lamp 10 is a lamp in which an anode 14 and a cathode 16 are opposed to each other in a spherical light emitting tube 12 made of quartz glass, and quartz glass sealing tubes 20 and 60 are provided at both ends of the light emitting tube 12. It is arranged so as to face each other. Both ends of the sealing tubes 20 and 60 are closed with caps 80A and 80B.

封止管２０、６０の内部には、陽極１４、陰極１６を支持するとともに、発光管１２内の放電空間１１を封止するパーツ（以下、マウント部品という）１８Ａ、１８Ｂがそれぞれ封入されている。また、放電空間１１には、水銀および希ガスが封入されている。   Inside the sealing tubes 20 and 60, parts (hereinafter referred to as mounting parts) 18A and 18B for supporting the anode 14 and the cathode 16 and sealing the discharge space 11 in the arc tube 12 are encapsulated, respectively. . Further, mercury and a rare gas are sealed in the discharge space 11.

図２に示すように、封止管２０内部には、陽極１４を支持する電極支持棒２２が設けられ、電極軸Ｅ（封止管軸）の方向に沿って配設されている。電極支持棒２２は、円筒状の肉厚ガラス管（以下、電極側ガラス管という）２４に形成された軸穴２４Ａに挿通され、電極側ガラス管２４によって保持される。電極側ガラス管２４の発光管側端部には、封止管２０との溶着を確実にするため、円筒状の凹部２４Ｂが形成されている。   As shown in FIG. 2, an electrode support rod 22 that supports the anode 14 is provided inside the sealing tube 20, and is disposed along the direction of the electrode axis E (sealing tube axis). The electrode support rod 22 is inserted into a shaft hole 24 </ b> A formed in a cylindrical thick glass tube (hereinafter referred to as an electrode side glass tube) 24 and is held by the electrode side glass tube 24. A cylindrical recess 24 </ b> B is formed at the arc tube side end of the electrode side glass tube 24 to ensure welding with the sealing tube 20.

電極支持棒２２は、封止管２０の端部まで延びておらず、所定間隔を置いて金属製のリード棒２８が同軸的に対向配置されている。電極支持棒２２、リード棒２８は、円筒状のガラス管（以下、封止管端部側ガラス管という）３４の両端に設けた挿入穴に軸挿され、封止管端部側ガラス管３４は、電極支持棒２２、リード棒２８を保持する。リード棒２８は、電源部（図示せず）と繋がった外部のリード線（図示せず）に接続されている。   The electrode support bar 22 does not extend to the end of the sealing tube 20, and a metal lead bar 28 is coaxially disposed opposite to the electrode support bar 22 at a predetermined interval. The electrode support rod 22 and the lead rod 28 are inserted into insertion holes provided at both ends of a cylindrical glass tube (hereinafter referred to as a sealed tube end side glass tube) 34, and the sealed tube end side glass tube 34 is inserted. Holds the electrode support rod 22 and the lead rod 28. The lead bar 28 is connected to an external lead wire (not shown) connected to a power supply unit (not shown).

封止管端部側ガラス管３４の両端には、金属リング２６、３２がそれぞれ配置され、電極支持棒２２、リード棒２８は金属リング２６、３２の軸穴２６Ａ、３２Ａに溶接されている。発光管１２に近い金属リング（以下、内側金属リングという）２６は、ディスク状の円板箔４２、４４に挟まれており、他方の金属リング（以下、外側金属リングという）３２も同様に、ディスク状の円板箔（図示せず）を介して挟まれている。   Metal rings 26 and 32 are respectively disposed at both ends of the sealing tube end portion side glass tube 34, and the electrode support rod 22 and the lead rod 28 are welded to the shaft holes 26 </ b> A and 32 </ b> A of the metal rings 26 and 32. A metal ring (hereinafter referred to as an inner metal ring) 26 close to the arc tube 12 is sandwiched between disc-shaped disc foils 42 and 44, and the other metal ring (hereinafter referred to as an outer metal ring) 32 is also similar. It is sandwiched between disc-shaped disc foils (not shown).

内側金属リング２６と外側金属リング３２の間には、複数の帯状金属箔３６が封止管端部側ガラス管３４の外表面に沿って軸方向に延び、その両端は、内側金属リング２６、外側金属リング３２の外周面に溶接されている。外側金属リング３２は、リード棒２８と金属箔３６とを電気的に接続させ、内側金属リング２６は、帯状金属箔３６と電極支持棒２２とを電気的に接続させる。これにより、電源部と接続するリード棒２８から陽極１４へ電力が供給される。   Between the inner metal ring 26 and the outer metal ring 32, a plurality of strip-shaped metal foils 36 extend in the axial direction along the outer surface of the sealed tube end side glass tube 34, and both ends of the inner metal ring 26, It is welded to the outer peripheral surface of the outer metal ring 32. The outer metal ring 32 electrically connects the lead bar 28 and the metal foil 36, and the inner metal ring 26 electrically connects the strip-shaped metal foil 36 and the electrode support bar 22. As a result, power is supplied to the anode 14 from the lead rod 28 connected to the power supply unit.

内側金属リング２６の両面に配置された円板箔４２、４４は電極支持棒２２に挿通されており、それぞれ封止管端部側ガラス管３４、電極側ガラス管２４と密接している。円板箔４２は内側金属リング２６の封止管端部側表面と圧接し、円板箔４４は内側金属リング２６の発光管側表面と圧接している。   The disc foils 42 and 44 arranged on both surfaces of the inner metal ring 26 are inserted into the electrode support rod 22 and are in close contact with the sealing tube end side glass tube 34 and the electrode side glass tube 24, respectively. The disc foil 42 is in pressure contact with the surface of the inner metal ring 26 on the sealing tube end side, and the disc foil 44 is in pressure contact with the arc tube side surface of the inner metal ring 26.

内側金属リング２６の外周面上には、筒状に巻かれた外側巻き箔４６が設けられており、内側金属リング２６とともに金属箔３６の電極側端部を覆っている。一方、電極側ガラス管２４の軸穴２４Ａと電極支持棒２２との間には、内側巻き箔が巻かれている（ここでは図示せず）。   On the outer peripheral surface of the inner metal ring 26, an outer wound foil 46 wound in a cylindrical shape is provided, and covers the electrode side end portion of the metal foil 36 together with the inner metal ring 26. On the other hand, an inner wound foil is wound between the shaft hole 24A of the electrode side glass tube 24 and the electrode support rod 22 (not shown here).

封止管２０は、封止工程時にガスバーナーなどで熱せられることによって縮径し、電極側ガラス管２４、封止管端部側ガラス管３４、固定ガラス管２９と溶着している。これにより、封止管２０内部が封止され、電極側ガラス管２４、内側金属リング２６、外側金属リング３２、封止管端部側ガラス管３４、そして固定ガラス管２９を含むマウント部品１８Ａが、軸方向に動かないように固定される。なお、陰極側封止管６０も同様に構成されている。   The sealing tube 20 is reduced in diameter by being heated by a gas burner or the like during the sealing process, and is welded to the electrode side glass tube 24, the sealing tube end side glass tube 34, and the fixed glass tube 29. Thereby, the inside of the sealing tube 20 is sealed, and the mounting component 18A including the electrode side glass tube 24, the inner metal ring 26, the outer metal ring 32, the sealing tube end side glass tube 34, and the fixed glass tube 29 is obtained. It is fixed so as not to move in the axial direction. The cathode side sealing tube 60 is configured in the same manner.

図３は、図２の内側金属リング付近を拡大して示した断面図である。図４は、図３の外側巻き箔付近を拡大して示した図である。図３、４を用いて、外側巻き箔の配置構成について説明する。   3 is an enlarged cross-sectional view of the vicinity of the inner metal ring of FIG. FIG. 4 is an enlarged view of the vicinity of the outer winding foil of FIG. The arrangement configuration of the outer winding foil will be described with reference to FIGS.

金属箔３６は、軸方向に沿って内側金属リング２６の外周面の軸方向範囲Ｔまでしか延びていない。外側巻き箔４６は、金属箔３６および内側金属リング２６と密着するように内側金属リング２６周りに巻き回されている。これにより、内側金属リング２６、および金属箔３６の電極側端部は、封止管２０と直接接触していない。   The metal foil 36 extends only to the axial range T of the outer peripheral surface of the inner metal ring 26 along the axial direction. The outer winding foil 46 is wound around the inner metal ring 26 so as to be in close contact with the metal foil 36 and the inner metal ring 26. Thus, the inner metal ring 26 and the electrode side end of the metal foil 36 are not in direct contact with the sealing tube 20.

さらに外側巻き箔４６は、内側金属リング２６の外周面の軸方向範囲Ｔを超え、電極側ガラス管２４まで延びている。したがって、外側巻き箔４６の電極側端部（周縁部）４６Ｔは、電極軸Ｅに沿って金属箔３６さらには内側金属リング２６よりも電極側、発光管側に位置する。   Further, the outer wound foil 46 extends beyond the axial range T of the outer peripheral surface of the inner metal ring 26 and extends to the electrode side glass tube 24. Therefore, the electrode-side end portion (peripheral edge portion) 46T of the outer winding foil 46 is positioned on the electrode side and the arc tube side with respect to the metal foil 36 and the inner metal ring 26 along the electrode axis E.

このように、外側巻き箔４６は、電極側端部４６Ｔから他方の端部４６Ｓに渡る幅をもち、内側金属リング２６の軸方向範囲Ｔ、すなわちリングの厚さよりも十分に長い。このような構成により、封止管のクラック発生を防ぐことができる。   Thus, the outer winding foil 46 has a width extending from the electrode side end portion 46T to the other end portion 46S, and is sufficiently longer than the axial range T of the inner metal ring 26, that is, the thickness of the ring. With such a configuration, the occurrence of cracks in the sealing tube can be prevented.

詳述すると、内側金属リング２６の電極側側面と接する円板箔４４は、電極側ガラス管２４よりも径が小さい。そのため、円板箔４４の周囲には、空隙、隙間が僅かに形成されている。それに加え、内側金属リング２６、電極側ガラス管２４の面取り等の加工作業により、断面が楔状の大空隙、隙間Ｓが周方向に沿って形成されている。   More specifically, the disc foil 44 in contact with the electrode side surface of the inner metal ring 26 has a smaller diameter than the electrode side glass tube 24. Therefore, a slight gap or gap is formed around the disc foil 44. In addition, a large gap having a wedge-shaped cross section and a gap S are formed along the circumferential direction by processing operations such as chamfering the inner metal ring 26 and the electrode side glass tube 24.

図４には、内側金属リング２６、電極側ガラス管２４、封止管２０との間に形成される隙間Ｓが図示されている。面取り加工によって内側金属リング２６、電極側ガラス管２４の周縁部は丸みを帯びており、エッジ状になっていない。   FIG. 4 shows a gap S formed between the inner metal ring 26, the electrode side glass tube 24, and the sealing tube 20. Due to the chamfering process, the inner metal ring 26 and the peripheral edge of the electrode side glass tube 24 are rounded and not edged.

そして、この隙間Ｓの圧力は、放電空間内の圧力と等しい。これは、電極支持棒２２と電極側ガラス管２４との間に内側巻き箔４８が設けられていることにより（図３参照）、材質、熱膨張率等の異なる電極側ガラス管２４と電極支持棒２２、円板箔４４、そして内側巻き箔４８とは完全に密着せずに隙間が生じる結果、隙間Ｓは放電空間１１と連通するためである。   The pressure in the gap S is equal to the pressure in the discharge space. This is because the inner winding foil 48 is provided between the electrode support rod 22 and the electrode side glass tube 24 (see FIG. 3), so that the electrode side glass tube 24 and the electrode support differing in material, thermal expansion coefficient, and the like. This is because the gap S is communicated with the discharge space 11 as a result of the gap being formed without being in close contact with the rod 22, the disc foil 44, and the inner winding foil 48.

このように大きな圧力のある隙間Ｓが形成されながらも、外側巻き箔４６が隙間Ｓに露出することで封止管２０が隙間Ｓに面していないため、隙間の形状は安定し、クサビ状の隙間が生じることがなく、封止管に直接圧力がかからない。また、外側巻き箔４６は、その電極側端部４６Ｔが封止管２０と電極側ガラス管２４との間に介在するように巻き回されており、電極側端部４６Ｔの電極軸Ｅからの距離Ｒ１は、内側金属リング外周面２０Ｍの電極軸Ｅからの距離Ｒ０よりも短い。すなわち、電極側端部４６Ｔは、径方向に沿って内側金属リング外周面２０Ｍよりも電極軸に近い位置にある。   While the gap S having such a large pressure is formed, the outer winding foil 46 is exposed to the gap S, so that the sealing tube 20 does not face the gap S. Therefore, the shape of the gap is stable and has a wedge shape. No gap is generated, and no pressure is directly applied to the sealing tube. Further, the outer wound foil 46 is wound so that the electrode side end portion 46T is interposed between the sealing tube 20 and the electrode side glass tube 24, and the electrode side end portion 46T extends from the electrode axis E. The distance R1 is shorter than the distance R0 from the electrode axis E of the inner metal ring outer peripheral surface 20M. That is, the electrode side end 46T is located closer to the electrode axis than the inner metal ring outer peripheral surface 20M along the radial direction.

このような構成は、内側金属リング２６の外径よりも電極側ガラス管２４の外径を小さくマウント部材として用いることで形成することができる。また、内側金属リング２６と電極側ガラス管２４の外径を略同一として、封止工程において電極側ガラス管の外径を縮径することによっても形成することができる。このような構成とすることで、封止工程において、電極側端部４６Ｔが封止管の外周面側に向かって入り込むことを防ぎ、電極側端部４６Ｔを起点としたクラック発生を防ぐことができる。   Such a configuration can be formed by using the outer diameter of the electrode side glass tube 24 smaller than the outer diameter of the inner metal ring 26 as a mounting member. Alternatively, the inner metal ring 26 and the electrode-side glass tube 24 can be formed to have substantially the same outer diameter, and the outer diameter of the electrode-side glass tube is reduced in the sealing step. By adopting such a configuration, in the sealing process, the electrode-side end portion 46T is prevented from entering toward the outer peripheral surface side of the sealing tube, and cracks starting from the electrode-side end portion 46T can be prevented. it can.

したがって、封止工程において封止管素材を縮径したときにクサビ状の隙間が生じることがなく、ランプ点灯・消灯時などの径方向の熱膨張率の相違によって内側金属リング２６と封止管２０との間に応力が生じても、可撓性のある外側巻き箔４６が変形によって応力を吸収するため、隙間Ｓを起点としたクラック発生を防ぐことができる。また、内側金属リング２６付近では、電極側ガラス管２４、内側金属リング２６、そして金属箔３６すべてと密接しながらこれらをカバーしているため、内側金属リング２６およびその近辺から封止管側へかかる応力集中を抑えることができる。   Therefore, there is no wedge-shaped gap when the diameter of the sealing tube material is reduced in the sealing process, and the inner metal ring 26 and the sealing tube are different due to the difference in the thermal expansion coefficient in the radial direction when the lamp is turned on or off. Even if a stress is generated between the outer peripheral foil 20 and the flexible outer winding foil 46, the flexible outer winding foil 46 absorbs the stress by deformation, so that it is possible to prevent the occurrence of cracks starting from the gap S. Further, in the vicinity of the inner metal ring 26, the electrode side glass tube 24, the inner metal ring 26, and the metal foil 36 are all covered in close contact, so that the inner metal ring 26 and the vicinity thereof toward the sealing tube side. Such stress concentration can be suppressed.

このように本実施形態によれば、放電ランプ１０の封止管２０内において、金属箔３６と溶接する内側金属リング２６が電極支持棒２２と挿通させた状態で接合しており、内側金属リング２６の周囲には外側巻き箔４６が巻かれている。外側巻き箔４６は、内側金属リング２６を越えて電極側ガラス管２４まで延在し、外側巻き箔４６の電極側端部４６Ｔは、内側金属２６よりも電極軸Ｅに沿って電極側に位置する。   As described above, according to the present embodiment, the inner metal ring 26 to be welded to the metal foil 36 is joined to the electrode support rod 22 in the sealed tube 20 of the discharge lamp 10, and the inner metal ring 36 is joined. An outer wound foil 46 is wound around 26. The outer winding foil 46 extends to the electrode side glass tube 24 beyond the inner metal ring 26, and the electrode side end portion 46 </ b> T of the outer winding foil 46 is positioned closer to the electrode side along the electrode axis E than the inner metal 26. To do.

なお、内側金属リング２６の側面に円板箔４２、４４を設けない構成にしてもよい。また、内側金属リング以外の導電性円板部材を金属箔および電極支持棒との間に介在させてもよい。外側巻き箔は、金属以外の導電性、あるいは絶縁性物質など任意の材料で構成してもよい。   In addition, you may make it the structure which does not provide the disc foils 42 and 44 in the side surface of the inner side metal ring 26. FIG. Further, a conductive disk member other than the inner metal ring may be interposed between the metal foil and the electrode support rod. The outer wound foil may be made of any material such as a conductive or insulating substance other than metal.

また、外側金属リング３２に同様の外側巻き箔を構成してもよい。この場合、外側巻き箔の電極反対側端部は、金属箔３６の電極反対側端部、そして外側金属リング３２を越えて、環状の固定ガラス管２９、口金８０Ａ側にまで延びるように構成される。   Moreover, you may comprise the same outer side winding foil in the outer side metal ring 32. FIG. In this case, the electrode opposite end of the outer winding foil is configured to extend beyond the electrode opposite end of the metal foil 36 and the outer metal ring 32 to the annular fixed glass tube 29 and the base 80A side. The

１０ 放電ランプ
１１ 放電空間
１２ 発光管
２０ 封止管
２２ 電極支持棒
２４ 電極側ガラス管（ガラス管）
２６ 内側金属リング（導電性円板部材）
２９ 固定ガラス管（ガラス管）
３２ 外側金属リング（導電性円板部材）
３４ 封止管端部側ガラス管
３６ 金属箔
４２、４４ 円板箔
４６ 外側巻き箔（巻き箔）
４８ 内側巻き箔 DESCRIPTION OF SYMBOLS 10 Discharge lamp 11 Discharge space 12 Light emission tube 20 Sealing tube 22 Electrode support rod 24 Electrode side glass tube (glass tube)
26 Inner metal ring (conductive disk member)
29 Fixed glass tube (glass tube)
32 Outer metal ring (conductive disk member)
34 Sealing tube end side glass tube 36 Metal foil 42, 44 Disc foil 46 Outer winding foil (rolling foil)
48 Inner winding foil

Claims (5)

発光管内の電極を支持する電極支持棒と、
前記電極支持棒が挿通され、封止管と溶着するガラス管と、
前記電極支持棒が接続され、軸方向に沿って配設された金属箔と前記電極支持棒と電気的に接続させる導電性円板部材と、
前記導電性円板部材の外周面を覆う巻き箔とを備え、
前記巻き箔が、軸方向に沿って前記金属箔の端部および前記導電性円板部材を超えて前記ガラス管まで延びており、
前記巻き箔の電極側端部が、前記封止管と前記ガラス管との間に介在することを特徴とする放電ランプ。 An electrode support rod for supporting the electrode in the arc tube;
A glass tube through which the electrode support rod is inserted and welded to a sealing tube;
The electrode support rod is connected, and a conductive foil member electrically connected to the metal foil disposed along the axial direction and the electrode support rod;
A winding foil covering the outer peripheral surface of the conductive disk member;
The wound foil extends along the axial direction to the glass tube beyond the end of the metal foil and the conductive disc member ;
The discharge lamp according to claim 1 , wherein an electrode side end portion of the wound foil is interposed between the sealing tube and the glass tube . 前記導電性円板部材と、前記封止管と、前記ガラス管との間に形成された隙間に、前記巻き箔が露出していることを特徴とする請求項１に記載の放電ランプ。   The discharge lamp according to claim 1, wherein the wound foil is exposed in a gap formed between the conductive disk member, the sealing tube, and the glass tube. 発光管内の電極を支持する電極支持棒と、
前記電極支持棒が挿通され、封止管と溶着するガラス管と、
前記電極支持棒が接続され、軸方向に沿って配設された金属箔と前記電極支持棒とを電気的に接続させる導電性円板部材と、
前記導電性円板部材の外周面を覆う巻き箔とを備え、
前記巻き箔の電極側端部が、軸方向に沿って前記金属箔の端部および前記導電性円板部材よりも電極側に位置し、
前記巻き箔の電極側端部が、径方向に沿って前記導電性円板部材外周面よりも軸側に位置することを特徴とする放電ランプ。 An electrode support rod for supporting the electrode in the arc tube;
A glass tube through which the electrode support rod is inserted and welded to a sealing tube;
A conductive disc member to which the electrode support rod is connected and electrically connects the metal foil disposed along the axial direction and the electrode support rod;
A winding foil covering the outer peripheral surface of the conductive disk member;
The electrode side end of the wound foil is positioned on the electrode side from the end of the metal foil and the conductive disc member along the axial direction ,
The wound electrode side end portion of the foil, discharge electric lamps you being located on the shaft side than said conductive disc member outer peripheral surface along a radial direction. 前記電極支持棒が挿通され、前記導電性円板部材と前記ガラス管との間に接触配置される円板箔とをさらに備えることを特徴とする請求項１乃至３のいずれかに記載の放電ランプ。   The electric discharge according to any one of claims 1 to 3, further comprising: a disk foil inserted through the electrode support bar and disposed in contact between the conductive disk member and the glass tube. lamp. 外部の電源と電気的に接続されたリード棒と、
前記リード棒が挿通され、封止管と溶着するガラス管と、
前記リード棒が接続され、軸方向に沿って配設された金属箔と前記リード棒とを電気的に接続させる導電性円板部材と、
前記導電性円板部材の外周面を覆う巻き箔とを備え、
前記巻き箔が、軸方向に沿って前記金属箔の端部および前記導電性円板部材を超えて前記ガラス管まで延びており、
前記巻き箔の電極反対側端部が、前記封止管と前記ガラス管との間に介在することを特徴とする放電ランプ。
A lead bar electrically connected to an external power source;
A glass tube through which the lead bar is inserted and welded to a sealing tube;
A conductive disc member to which the lead bar is connected, and electrically connects the metal foil disposed along the axial direction and the lead bar;
A winding foil covering the outer peripheral surface of the conductive disk member;
The wound foil extends along the axial direction to the glass tube beyond the end of the metal foil and the conductive disc member ;
The discharge lamp , wherein an end of the wound foil opposite to the electrode is interposed between the sealing tube and the glass tube .
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JP5379516B2 (en) * 2009-02-26 2013-12-25 株式会社オーク製作所 Discharge lamp

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TWI587356B (en) 2017-06-11
KR101895620B1 (en) 2018-09-05

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