WO2000014769A1 - Lampe a decharge a vapeurs metalliques - Google Patents

Lampe a decharge a vapeurs metalliques Download PDF

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Publication number
WO2000014769A1
WO2000014769A1 PCT/JP1999/004806 JP9904806W WO0014769A1 WO 2000014769 A1 WO2000014769 A1 WO 2000014769A1 JP 9904806 W JP9904806 W JP 9904806W WO 0014769 A1 WO0014769 A1 WO 0014769A1
Authority
WO
WIPO (PCT)
Prior art keywords
molybdenum
tube
metal
discharge lamp
ceramic
Prior art date
Application number
PCT/JP1999/004806
Other languages
English (en)
Japanese (ja)
Inventor
Noboru Haraguchi
Hiroshi Kawai
Fumihide Uehara
Original Assignee
Iwasaki Electric Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Iwasaki Electric Co., Ltd. filed Critical Iwasaki Electric Co., Ltd.
Publication of WO2000014769A1 publication Critical patent/WO2000014769A1/fr

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a metal vapor discharge lamp such as a metal halide lamp using a ceramic arc tube, and more particularly to a metal vapor discharge lamp using a ceramic arc tube with an improved configuration of a sealing portion of a current introducing body.
  • a ceramic arc tube of a metal halide lamp a ceramic arc tube having a cylindrical ceramic protruding end portion at both ends of a ceramic discharge vessel is known.
  • Japanese Patent Application Laid-Open No. Hei 6-196131 discloses a tube using hydrogen and an oxygen-permeable metal as a current introducing body.
  • a thermal expansion coefficient is substantially the same as that of alumina, which is a material of a thin tubular protruding end portion, as a current introducing body in a sealing portion formed by glass frit at the end.
  • niobium metal pins with reliability ensures the reliability against the stress at the sealing part. If the niobium pin is exposed inside the arc tube, the niobium pin contacts the liquid phase of the halide sealed during the operation of the arc tube and corrodes, so that the niobium pin does not extend into the arc tube, In addition, it is coated with a highly halogen-resistant metal film such as tungsten or molybdenum.
  • niobium pins, molybdenum pins, and electrodes are used as metal current introducers inserted and arranged at the protruding ends of the tubular ceramic.
  • the core rods are butt-welded from the outside to the inside of the arc tube in order.
  • the technology disclosed in this publication is based on the technology disclosed in Japanese Patent Publication No. 3-17777.
  • the ceramic arc tube does not have a thin tubular protruding end at both ends, but has a structure in which a molybdenum metal conductor with high halogen resistance is passed through the closed part of the discharge vessel and sealed as a current introducer.
  • Japanese Patent Application Laid-Open No. 51-71887 this is disclosed in Japanese Patent Application Laid-Open No. 51-71887.
  • a molybdenum tube penetrates the center of a ring-shaped ceramic molded body provided at both ends of an alumina discharge vessel, and a cylindrical ceramic molded body is further provided inside the molybdenum tube.
  • the glass frit is inserted into the gap between the ring-shaped ceramic molded body, the molybdenum tube, and the ceramic molded body in the molybdenum tube to seal it.
  • the temperature of the metal halide staying portion near the seal material is reduced from 700 ° C to 800 ° C in order to improve the light emission characteristics. With this setting, the sealing material will be eroded by the metal halide components along with the lamp life, and the gas in the arc tube will leak. There is a problem of doing it.
  • Japanese Patent Application Laid-Open No. 5-198825 discloses a ceramic arc tube and a material constituting the arc tube main body, for example, a metal having a smaller coefficient of thermal expansion than aluminum.
  • a method of maintaining the airtightness between the current introducing body and the airtight body an alumina tungsten cermet having an intermediate thermal expansion coefficient between the arc tube main body and the current introducing body is used as an intermediate layer, and the above three members are airtight.
  • sintering is achieved by utilizing the shrinkage and shrinkage of simultaneous sintering.
  • Hei 7-1990 discloses a frit having a composition of alumina, silica, yttria, and molybdenum oxide. It has been shown that the cermet interface as a substrate can be hermetically sealed. Assuming that the luminous efficiency and the quality of light are good, considering the heat loss from the end members during the operation of the arc tube, In this case, since the entire length of the cermet cannot be made too large, the temperature of the seal portion due to the glass frit is still high, and cracks are liable to occur due to repeated thermal loads.
  • the present invention has been made in order to solve the above-mentioned problems in the conventional ceramic arc tube, and is directed to a metal vapor discharge lamp having a ceramic arc tube provided with a thin tubular protrusion at both ends.
  • a ceramic arc tube with a high color rendering property that can be sealed directly by inserting a halogen-resistant molybdenum current introducer into the protruding part, and also prevents cracks from occurring even when lighting is repeated.
  • the purpose is to provide. Disclosure of the invention
  • the present invention relates to a metal vapor discharge lamp having a ceramic arc tube with an ionized discharge substance sealed therein and an electrode system at both ends, wherein the ceramic arc tube includes a discharge vessel surrounding a discharge portion; and the discharge vessel. And a ceramic tubular protruding portion having an outer diameter smaller than that of the discharge vessel provided at both ends of the discharge vessel.
  • a halogen-resistant metal tubular conductor is inserted and arranged via a minute gap, and a gap between the inner wall surface of the tubular protrusion and the outer peripheral surface of the thin tubular conductor is provided. It is configured by sealing with a sealing material.
  • a thin-walled halogen-resistant metal tubular conductor having an electrode core rod welded to the closed end portion is inserted into the tubular protruding portion through a minute gap, and the inner wall surface of the tubular protruding portion is inserted. And the outer peripheral surface of the thin-walled tubular conductor are sealed with a sealing material. The generation of cracks can be effectively prevented.
  • FIG. 1 is a schematic cross-sectional view showing a preferred embodiment of a metal vapor discharge lamp according to the present invention
  • FIG. 2 is a cross-sectional view showing an enlarged main part of the embodiment shown in FIG.
  • FIG. 3 is a diagram showing the overall configuration of the current introducing body in the embodiment shown in FIGS. 1 and 2.
  • FIG. 4 is a diagram showing another configuration example of the current introduction body
  • FIG. 5 is a diagram showing still another configuration example of the current introduction body.
  • FIG. 6 is a diagram showing the relationship between the thickness of the molybdenum pipe and the seal length at which cracks occur.
  • FIG. 1 is a schematic sectional view showing an arc tube of a metal halide lamp according to a preferred embodiment of a metal vapor discharge lamp according to the present invention.
  • reference numeral 1 denotes a discharge vessel constituting a ceramic arc tube of an input 150 W metal halide lamp.
  • the discharge vessel 1 is formed in a cylindrical shape having both ends inclined, and has a center hole at both ends.
  • the outer diameter of the discharge vessel 1 is approximately one-third of the outer diameter of both ends.
  • (Hereinafter referred to as a part of the capillaries) 2 is integrally formed by sintering with a projection length of 14 mm from the end face 1a of the discharge vessel 1.
  • reference numeral 3 denotes a molybdenum tube sealed in the hollow portion of the part of the capillaries 2, and the molybdenum tube 3 is formed of molybdenum doped with lanthanum oxide. It prevents embrittlement after forming and improves workability and weldability.
  • the outer diameter of the molybdenum tube 3 is 0.95 mm, the wall thickness is 0.1 mm, and one end is hermetically closed by a closed portion 3a.
  • Reference numeral 4 denotes a molybdenum rod of the same material as the 0.7-mm-diameter ⁇ -ribbed tube 3 inserted into the hollow portion of the molybdenum tube 3 and one end thereof is welded to the inside of the closed portion 3a of the molybdenum tube 3 by plasma welding.
  • Reference numeral 5 denotes an electrode core rod welded to the outside of the closed portion 3a of the molybdenum tube 3 by resistance heating welding with one end coaxial with the molybdenum tube.
  • An electrode 6 is formed at the tip of the electrode core rod 5, and as shown in FIG. 3, the electrode core rod 5, the molybdenum tube 3, and the molybdenum rod 4 constitute a current introducing body 7.
  • the current introducing body composed of the electrode core rod 5, the molybdenum tube 3, and the molybdenum rod 4 is inserted into the discharge vessel 1 by a predetermined length through the central hole of the portion 2 of the cable.
  • the length including the welded portion of the molybdenum pipe 3 in the part of the capillaries is 12 mm.
  • a portion 5 mm from the end face of the part 2 of the capillary is hermetically sealed by a glass frit.
  • reference numeral 8 denotes a frit layer.
  • the glass frit is a crushed glass material having a composition of alumina, silica, yttria, and molybdenum oxide. A ring is formed by mixing a binder and sealing is performed. The coefficient of thermal expansion of the glass frit is between molybdenum and the alumina that constitutes the discharge vessel 1 and part of the cavity 2. It is approximately 5 x 1 0- 7 between.
  • the frit layer 7 and the part of the alumina cavities 2 after sealing at room temperature a tensile stress is applied to the surface of the alumina cavities to cause a vertical crack.
  • a tensile stress is applied to the surface of the alumina cavities to cause a vertical crack.
  • the molybdenum tube 3 inserted into the inside of the cavity portion 2 is formed to be thin, this stress is absorbed by the molybdenum tube 3 and reaches the point where the alumina cavity portion 2 is destroyed. Can not be.
  • a compressive stress acts on the frit layer 7, but the frit layer 7 is strong against breakage due to the compressive stress. Further, the frit layer 7 hardly causes stress corrosion even with respect to the halide sealed in the discharge vessel.
  • the frit layer 7 used in the present embodiment has halogen resistance and heat resistance. The thickness of the frit layer 7 is as thin as 0.03 mm or less. Less likely to crack inside.
  • the insertion length of the current introduction body into the inside of the part 2 of the capillaries is 12 mm, and the seal length is 5 mm.
  • the current is applied to the electrode core rod 5 by the molybdenum rod 4 inserted into the molybdenum tube.
  • the molybdenum tube 3 it is necessary to arrange the molybdenum tube 3 so that the open end of the molybdenum tube 3 protrudes outside from the end face of the part 2 of the cable. The reason is that if the open end of the molybdenum pipe 3 does not protrude from the end face of the cavity section 2, the frit melted during sealing may flow into the gap between the molybdenum pipe 3 and the molybdenum rod 4 and solidify.
  • the molybdenum pipe 3 is projected outward from the end face of the capillary part 2 so that the molten frit flows only into the gap between the capillary part 2 and the molybdenum pipe 3 without entering the gap. Have been placed.
  • a predetermined amount of mercury, metal iodide, disodium iodide, thallium iodide, and sodium iodide are added.
  • Body 7 is inserted and sealed with a frit in an Angone as well to complete the arc tube.
  • An external lead is connected to the molybdenum rod 4 of the current introducing body 7 to supply a current to the completed arc tube. Since the external leads are connected to the molybdenum rod 4 instead of the molybdenum tube 3 of the current introducing body 7, the connection is easy.
  • the composition of alumina, silica, yttria, and molybdenum oxide has been described as a glass frit.
  • a ground glass having a composition of alumina, silica, dysprosium oxide, and molybdenum oxide may be used.
  • holmium iodide or the like may be further added and encapsulated in addition to the above.
  • FIG. 4 is a diagram showing another configuration example of the current introducing body.
  • the length of the electrode core rod 15 is set to be twice as long as that of the embodiment shown in FIGS. 1 to 3.
  • the welded portion of the molybdenum tube 13 and the molybdenum tube 13 is configured to be located outside of the discharge vessel.
  • the length of the molybdenum tube 13 inserted into a part of the cavity is a seal ( Flit layer) It is only about 1 mm longer than the length.
  • molybdenum coil 18 force ⁇ molybdenum tube 1
  • the coil 18 is wound tightly over the length from the welded part 3 to the part located at the discharge vessel side end of the cavity, and one end of this coil 18 is welded to the molybdenum tube 13.
  • the outer diameter of the wound coil 18 is configured to be substantially the same as the outer diameter of the molybdenum tube 13.
  • 14 is a molybdenum rod
  • 16 is an electrode.
  • the welding position of each part is lower in temperature than that of the embodiment shown in FIGS. 1 to 3, and it becomes difficult to cause corrosion due to halides.
  • the molybdenum coil 18 is provided around the electrode rod 15 because, if the molybdenum coil is not provided in the current introducing body having a configuration in which the length of the electrode rod is increased, the inside of the arc tube is not provided.
  • the problem is that the gaseous and liquid phases of the halide enclosed in the tube penetrate into the vicinity of the weld between the electrode rod and the molybdenum tube, reducing the amount of halide evaporated in the discharge space and changing the emission color. Occurs.
  • the molybdenum coil 18 is provided to fill the gap between the inside of the cavity at the end of the arc tube and the electrode rod, and to prevent the halide from aggregating in this space as much as possible. is there.
  • FIG. 5 is a diagram showing still another configuration example of the current introducing body.
  • the current introducing body 27 of this configuration example is the same as the current introducing body in the embodiment shown in FIGS. 1 to 3 except that the molybdenum rod disposed inside the molybdenum tube 3 is omitted. It can be used when the external lead can be directly welded and connected to the molybdenum tube 3 without applying much external force.
  • the arc tube completed as described above is sealed in an outer bulb made of hard glass filled with 0.5 atm of nitrogen gas to constitute a metal halide lamp, and the power to be turned on ⁇
  • An experiment performed for setting the seal length (frit layer length) of the current introducing body and the wall thickness of the molybdenum tube in the present invention will be described.
  • Fig. 6 shows the test results.
  • the horizontal axis shows the thickness of the molybdenum pipe with an outer diameter of 0.95 mm
  • the vertical axis shows the seal length at which cracks occur, indicating the relationship between the two. From FIG. 6, it can be seen that as the wall thickness increases, cracks are more likely to occur in part of the cavities even with the same seal length.
  • the seal length is 2 mm, there is a probability that gas in the arc tube will leak in less than 100 hours of lighting time. Because of the increase, the seal length is preferably 4 mm or more. Under these conditions, it was found that the wall thickness of the molybdenum tube to prevent cracks in part of the capillaries should be 0.13 mm or less. Further, when the thickness of the molybdenum tube is less than 0.08 mm, the stress in the sealed portion is further reduced, and cracks are easily generated in the molybdenum tube itself during welding with the electrode core rod. The thickness is set between 0.08 and 0.13 mm.
  • the gap between the molybdenum pipe and the molybdenum rod is preferably about 0.1 to 0.025 mm from the viewpoint of the yield at the time of hermetic welding and the requirement of maintaining the elasticity of the molybdenum pipe.
  • the configuration of the current introducing body and the seal configuration in the present invention suppress the occurrence of cracks due to the flashing of the arc tube in a portion of the cab, but considering the heat flow of the current introducing body, It is considered that the heat flow from is mainly transmitted through the molybdenum rod inserted into the molybdenum tube and is transmitted to the outside of the arc tube. This is thought to be due to the fact that the temperature difference between the members constituting the seal portion (part of the cavities, frit layer, molybdenum tube) is small, and thermal stress is unlikely to occur, and the thickness of the molybdenum tube is appropriately thin. It is considered that the meat is used to absorb thermal stress due to its deformation. Can be
  • a thin-walled halogen-resistant metal tubular conductor in which an electrode core is welded and connected to a closed end portion is inserted into the ceramic tubular protrusion through a minute gap, The seal between the inner wall surface of the protruding part and the outer peripheral surface of the thin-walled tubular conductor is sealed with a sealing material. It is possible to realize a metal vapor discharge lamp having a ceramic arc tube that is absorbed and can prevent cracks from being generated in the ceramic tubular protrusion.

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  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

On décrit une lampe à décharge à vapeurs métalliques dans laquelle des parties saillantes (2) en céramique dont le diamètre extérieur est inférieur au diamètre d'une enceinte (1) de décharge sont prévues aux deux extrémités de l'enceinte (1). A l'intérieur de chacune des parties saillantes (2) se trouve un tube (3) en molybdène à paroi mince placé de sorte qu'un petit espace existe entre la partie saillante (2) et le tube (3), ce dernier comportant une extrémité fermée (3a) à laquelle est soudée (3) une extrémité d'une tige (5) d'électrode. Les espaces existant entre les surfaces de paroi interne des parties saillantes (2) et les surfaces externes du tube (3) en molybdène sont soudés avec des couches (8) de scellement, du mercure et un constituant d'halogénure métallique sont soudés dans l'enceinte (1) formant un tube à arc en céramique, ledit tube à arc en céramique étant soudé dans une ampoule extérieure.
PCT/JP1999/004806 1998-09-09 1999-09-06 Lampe a decharge a vapeurs metalliques WO2000014769A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10/270482 1998-09-09
JP10270482A JP2000090883A (ja) 1998-09-09 1998-09-09 金属蒸気放電灯

Publications (1)

Publication Number Publication Date
WO2000014769A1 true WO2000014769A1 (fr) 2000-03-16

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PCT/JP1999/004806 WO2000014769A1 (fr) 1998-09-09 1999-09-06 Lampe a decharge a vapeurs metalliques

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WO (1) WO2000014769A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4524787B2 (ja) * 2001-01-31 2010-08-18 岩崎電気株式会社 メタルハライドランプ
AT6924U1 (de) * 2003-05-27 2004-05-25 Plansee Ag Kaltkathoden-fluoreszenzlampe mit molybdän-stromdurchführungen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH031777B2 (fr) * 1980-09-05 1991-01-11 Fuiritsupusu Furuuiranpenfuaburiken Nv
JPH11149904A (ja) * 1997-11-13 1999-06-02 Japan Storage Battery Co Ltd 金属蒸気放電灯

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH031777B2 (fr) * 1980-09-05 1991-01-11 Fuiritsupusu Furuuiranpenfuaburiken Nv
JPH11149904A (ja) * 1997-11-13 1999-06-02 Japan Storage Battery Co Ltd 金属蒸気放電灯

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Publication number Publication date
JP2000090883A (ja) 2000-03-31

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