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EP0962955A2 - Lampe et procédé pour sa fabrication - Google Patents

Lampe et procédé pour sa fabrication Download PDF

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Publication number
EP0962955A2
EP0962955A2 EP99109885A EP99109885A EP0962955A2 EP 0962955 A2 EP0962955 A2 EP 0962955A2 EP 99109885 A EP99109885 A EP 99109885A EP 99109885 A EP99109885 A EP 99109885A EP 0962955 A2 EP0962955 A2 EP 0962955A2
Authority
EP
European Patent Office
Prior art keywords
glass
side tube
lamp
tube portion
manufacturing
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.)
Withdrawn
Application number
EP99109885A
Other languages
German (de)
English (en)
Other versions
EP0962955A3 (fr
Inventor
Yuriko Kaneko
Makoto Horiuchi
Mamoru Takeda
Masato Yosida
Yoshitaka Kurimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0962955A2 publication Critical patent/EP0962955A2/fr
Publication of EP0962955A3 publication Critical patent/EP0962955A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a lamp and a manufacturing method of that lamp that has a special structure of electrode sealing and whose internal pressure become one atmosphere or more when operated to light it.
  • high intensity discharge lamps have been widely used for ordinary illumination in homes, facilities and stores. In recent years, these lamps are being used as light sources for overhead projectors, projection televisions and motion picture projectors. The reason for this is because high intensity discharge lamps emit an extremely bright light.
  • the lamp When the mercury vapor pressure and other similar parameters are made to increase when operating the lamp, the lamp must be constructed such that it will not be cracked due to that high operating pressure.
  • Fig. 11 shows the structure of a conventional discharge lamp.
  • 100 is a light emission portion wherein exists a discharge arc and 101 is a side tube portion that extends from light emission portion 100.
  • Light emission portion 100 and side tube portion 101 are both comprised by quartz glass.
  • a gas that becomes a high pressure when the lamp is operated is sealed in light emission portion 100.
  • 102 is an electrode that functions to supply electrical current into light emission portion 100.
  • the electrode material is normally tungsten. In comparison to the thermal expansion coefficient of tungsten of 5.2 ⁇ 10 -6 , the thermal expansion coefficient of quartz glass is 5.5 ⁇ 10 -7 that is almost one decimal place different., Technology for sealing methods of two types which differ greatly in this way is difficult.
  • a foil sealing structure wherein a metal foil 104 connects between electrode 102 and an external electrical current supply line 103 and glass being sealed airtight in this metal foil.
  • pinch sealing is a manufacturing method of this foil sealing structure lamp.
  • conventional pinch sealing will be described referring to Fig. 12.
  • Glass tube 110 is formed by a separate process in which a quartz glass tube is heated and allowed to expand forming light emission portion 100 in a specified shape. A quartz glass tube that is not deformed is connected to both end portions of light emission portion 100 as side tube portion 101. Glass tube 110 is retained by a chuck 113., The end portion of electrode 102 is disposed on light emission portion 100 to maintain a discharge arc. And also, electrode 102, metal foil 104 (connected to the other end portion of electrode 102) and electrical current supply line 103 are disposed on side tube portion 101.
  • side tube portion 101 maintains in a rare gas environment.
  • the glass of this side tube portion 101 is thermally fused by a burner 111 and then pressure formed by a forming die 112 from two directions perpendicular to the surface of metal foil 104.
  • Electrode 102 and the glass of side tube portion 101 have different thermal expansion coefficients and there is no airtight seal. Thereupon, a gap can be opened between electrode 102 and the glass of side tube portion 101.
  • Fig. 13 shows the cross sectional shape of the side tube portion along line 105 shown in Fig. 11.
  • 120 is a side tube portion glass.
  • 121 is a gap between electrode 102 and side tube portion glass 120.
  • the shape of gap 121 has a sharp notch 122 due to squeezing from two directions of the glass. There was a problem of a concentration of stress acting on sharp notch 122 and the lamp being damaged due to a pressure lower than the pressure strength actually possessed by the glass.
  • the second problem is a crack 106 shown in Fig. 11.
  • This crack 106 occurs in the side tube portion glass at the position of electrode 102.
  • the percentage of cracks which occur during sealing is larger than cracks which occur due to differences in the thermal expansion coefficients of the electrode and the glass.
  • this crack has an action that is said to lessen the stress occurring between the electrode and the glass when lighting and extinguishing the lamp. Because of this, cracks which occur due to differences in the thermal expansion coefficients do not interfere with the lamp.
  • a shrink seal method is used to solve the above-mentioned two problems.
  • An example of a shrink seal method is shown in Fig. 14.
  • Glass tube 110 is retained by chuck 126.
  • the end portion of electrode 102 is disposed on light emission portion 100 to maintain a discharge arc.
  • electrode 102, metal foil 104 (connected to the other end portion of electrode 102) and electrical current supply line 103 are disposed on side tube portion 101.
  • a reduced pressure state is maintained inside glass tube 110. While this glass tube 110 is rotated in the circumferential direction of the tube (approximately indicated by arrow 128), side tube portion 101 is thermally fused uniformly by burner 127.
  • Side tube portion 101 glass undergoes diameter reduction by means of a pressure difference between the inside and outside of glass tube 110 and then metal foil 104 and side tube portion 101 glass positioned where the metal foil is located are sealed airtight.
  • the glass undergoes diameter reduction towards the electrode , the shape of the gap between the glass and the electrode becomes almost circular eliminating the notch portion that generates a concentration of stress. Further, because the sealing pressure does not exceed the atmospheric pressure, the glass does not receive any impact when sealed.
  • a method has been attempted that uses a die to evenly squeeze the glass (for example, a polygon shaped die or a circular die) in order that the shape of the gap between the electrode and the glass does not have a notch portion and that additionally removes cracks occurring in the side tube portion glass positioned where the electrode is located from the rear.
  • a die to evenly squeeze the glass (for example, a polygon shaped die or a circular die) in order that the shape of the gap between the electrode and the glass does not have a notch portion and that additionally removes cracks occurring in the side tube portion glass positioned where the electrode is located from the rear.
  • Japanese Patent Laid-open Publication (Kokai) HEI 5-159743 discloses a method which attempts to eliminate cracks by reheating and gradually cooling the side tube portion after pinch sealing.
  • Fig. 11 shows the state of crack 106.
  • a location 122 (Fig. 13) where a crack occurs is adjacent to light emission portion 100.
  • Light emission portion 100 is formed in an approximate spherical shape and the tip of the light emission portion adjacent to the side tube portion has a thin skin of glass making it especially vulnerable to deformation due to temperature increases.
  • Deformation of the light emission tube changes the temperature of the coolest point inside the light emission tube when the lamp is operated (lowest point in the direction of the gravitational force of light emission portion 100 when the axial direction of the side tube portion is set in the horizontal direction and used in that manner).
  • the vapor pressure of the light emitting material inside the lamp is determined by the coolest temperature point inside the light emission tube when the lamp is operated.
  • deformation of the light emission tube causes the vapor pressure of the light emitting material inside the lamp to change thereby changing the spectral distribution characteristics. Because of these factors, eliminating cracks after the sealing process is passed through is difficult.
  • the object of the present invention is to take these factors into consideration and provide a lamp with the following improvements. Eliminates concentration of stress occurring in the gap between the glass and electrode . Controls to a minimum the occurrence of cracks which occur due to factors other than differences in the thermal expansion coefficients of the glass and the electrode . And in addition has a high pressure strength structure with improved adhesiveness between the metal foil and the glass.
  • a method is used to produce a discharge lamp wherein an electrode assembly is hermetically sealed that comprises at least an electrical current supply line and a metal foil connected to the electrical current supply line to produce a lamp in the following process.
  • a side tube portion located at the position of the metal foil portion is compressed by a pressure higher than a pressure that compresses the side tube portion located at the position of the electrical current supply line in a process that hermetically seals the metal foil portion in a state in which the electrode assembly (positioned such that one portion of the electrical current supply line is inside the light emission portion) is inserted inside a glass bulb that comprises at least a light emission portion and a side tube portion extending into the light emission portion.
  • the lamp of the present invention is characterized by having a light emission portion comprised by glass, a side tube portion that extends from the light emission portion and is comprised by glass as well as an electrical current supply line with one portion arranged inside the light emission portion, one end portion connected to a metal foil, and that is hermetically sealed in the side tube portion.
  • the lamp is further characterized by the lateral cross sectional shape in the perpendicular direction of the axis of the electrical current supply line of the gap between the electrical current supply line and the side tube portion having a shape similar to the cross section of the electrical current supply line as well as the side tube portion glass located at the position of the metal foil portion being compression formed by a die.
  • the lamp of the present invention is further characterized by having an electrical current supply line with one portion arranged inside the light emission portion together with one end portion connected to a metal foil, and that is hermetically sealed in a side tube portion extending from the light emission portion. And is even further characterized by the lateral cross sectional shape in the perpendicular direction of the axis of the electrical current supply line of the gap between the electrical current supply line and the side tube portion having a smooth shape without notches which cause a concentration of stress and the side tube portion positioned where the metal foil is located being compression formed by a forming die.
  • Fig. 3 shows the structure of a discharge lamp of a first embodiment of the present invention.
  • 1 is a light emission portion comprised by glass and 2a and 2b are both side tube portions comprised by glass which extend from light emission portion 1.
  • an electrode assembly is hermetically sealed in here that connects metal foil 4 between electrode 3 and external electrical current supply line 5 connected to a power supply (not shown in figure).
  • a gas that becomes a high pressure when the lamp is operated is sealed in light emission portion 1 in like manner to a conventional discharge lamp.
  • Fig. 2A is an enlarged cross section along dashed line 6 of Fig. 3 and Fig. 2B is an enlarged cross section along dashed line 7 of Fig. 3.
  • the structure of the lamp of the first embodiment is characterized by the lateral cross sectional shape of the gap between electrode 3 and side tube portion glass 2 having a shape similar to the lateral cross sectional shape of the electrode and the side tube portion glass positioned where metal foil 4 is located being formed by a die.
  • the side tube portion glass 2 related to the present invention has a first portion wherein electrode 3 is inserted and retained and a second portion wherein metal foil 4 is inserted and retained.
  • the manufacturing method in the first embodiment initially uses a shrink seal method and then softens the first portion utilizing heat to reduce the diameter.
  • the portion inside the glass tube is brought to a pressure lower than atmospheric pressure to reduce the diameter.
  • a forming die is positioned at any of levels L1, L2 or L3, namely, the die is set at the connection portion between electrode 3 and metal foil 4 to carry out pinch sealing,
  • the forming die is set at the position of level L0 which is the boundary portion between light emission portion 1 and side tube portion glass 2.
  • pressure added to the second portion of the side tube portion glass is a value larger than the pressure added to the first portion. Because of this, stress on the side tube portion glass of the first portion is applied evenly to prevent cracks from easily occurring along with a high pressure being applied to the side tube portion glass of the second portion thereby improving the adhesiveness between the metal foil and the side tube portion glass.
  • the boundary between the first portion and the second portion can be a portion where electrode 3 and metal foil 4 overlap or a portion close to that.
  • FIG. 1 left column, top view is a cross-sectional view taken along a line A'-A' shown in left column bottom view, and the left column, bottom view is a cross-sectional view taken along a line A''-A'' shown in left column top view.
  • the views in the center column are the cross-sectional views taken along lines B'-B' and B''-B'' shown in counterpart views, and the views in the right column are the cross-sectional views taken along lines C'-C' and C''-C'' shown in counterpart views.
  • the views in the left column are prior art lamp formed by pinch seal method.
  • the views in the center column are prior art lamp formed by shrink seal method.
  • the views in the right column are present invention lamp formed by the method of the present invention.
  • a lamp with a conventional structure undergoes pinch sealing and shrink sealing.
  • a concentration of stress in the gap between the electrode and the side tube portion glass does not occur, and the adhesiveness of the metal foil is high.
  • the second portion of the side tube portion glass cracks in the lamp of the present invention, cracking similar to the metal foil peeling does not occur.
  • the side tube portion glass cracks in a direction that is roughly perpendicular or is at angle to the metal foil portion.
  • the cross sectional shape of the gap between the electrode 3 and the first portion of side tube portion glass 2 is a smooth shape without notch portions which generate a concentration of stress.
  • the shape can be circular, approximately circular, or an elliptical, approximately elliptical.
  • the second portion of side tube portion glass 2 positioned where metal foil 4 is located to reach to the area around the connection portion between the electrode and the metal foil. This allows even more improvement of the adhesiveness between the metal foil and the side tube portion glass.
  • FIG. 4 shows the structure of a incandescent lamp of a second embodiment of the present invention.
  • 200 is a light emission portion comprised by glass and 201 is a side tube portion comprised by glass which extends from light emission portion 200.
  • the electrode assembly is hermetically sealed in side tube portion 201. Both end portions of the electrode assembly are connected to metal foil 203 and external electrical current supply line 204 (connected to a power supply) is connected to electrical current supply line 202 of which one portion (positioned where light emission portion 200 is located) is formed in a coil shape as well as to the other end portion of the metal foil. A gas that becomes a high pressure when the lamp is operated is sealed in light emission portion 200.
  • Fig. 5A shows an enlarged cross sectional shape along side tube portion glass 210 positioned where electrical current supply line 202 of Fig. 4 is located and Fig. 5B shows an enlarged cross sectional shape along side tube portion 211.
  • the structure of the lamp of the second embodiment is characterized by the lateral cross sectional shape of the gap between electrical current supply line 202 and the side tube portion glass having a shape similar to the lateral cross sectional shape of electrical current supply line 202 and the side tube portion glass positioned where metal foil 203 is located being formed by a die.
  • the incandescent lamp of the second embodiment does not have a concentration of stress occurring in the gap between the electrode and the side tube portion glass.
  • the adhesiveness of the metal foil is also high.
  • Fig. 6 to Fig. 9 describe an embodiment of the manufacturing method of the lamp of the present invention.
  • Fig. 6 10 is a glass tube formed by a separate process wherein a quartz glass tube heats and is expanded and is comprised by light emission portion 11 formed in a specified shape and side tube portions 12a and 12b of the quartz glass tube which extend from both end portions of light emission portion 11. The end portion of the other side tube portion 12a is sealed.
  • electrode assembly 13 consists of electrode 20, metal foil 21 connected to electrode 20, and electrical current supply line 22 connected to the end portion of the metal foil portion on the side opposite to where the metal foil portion is connected to electrode 20.
  • a spring 23 is mounted to the end portion of metal current supply line 22 on the side not connected to the metal foil. Electrode assembly 13 attached to spring 23 inserts from the opening of side tube portion 12b and the end portion of the metal foil of the electrode not connected is arranged towards the light emission portion. By pressing the inner surface of the side tube portion glass on the spring connected to electrode assembly 13, electrode assembly 13 is secured at a specified position.
  • the end portion of side tube portion 12a of glass tube 10 is held by chuck 40 in a state in which argon gas is at 200 mbar and electrode assembly 13 is inserted.
  • glass tube 10 rotates in the direction of the circumference of the valve (indicated by arrow 42).
  • burner 41 heating element reaching to one portion of a metal lead-in wire 22 positioned where side tube portion 12b is located from the boundary of light emission portion 11 and side tube portion 12b.
  • the inside diameter of side tube portion 12b is reduced at the softened position by means of a pressure difference between the surrounding atmospheric pressure of glass tube 10.
  • the heating of burner 41 and the rotation 42 of glass tube 10 cease.
  • the side tube portion 12b glass positioned where metal foil 21 is located is squeezed by die 43 from two directions perpendicular to the plane of metal foil 21 (indicated by arrow 44). At this time, it is preferable for the squeezing action of die 43 to cease almost simultaneous when the heating of burner 41 ceases. This is to improve the adhesiveness between the glass and the metal foil by means of squeezing the glass in a sufficiently softened state. In this manner the electrode sealing of side tube portion 12b is complete.
  • Fig. 10 describes a manufacturing method for sealing utilizing high frequency dielectric heating.
  • 50 is a magnetron for carrying out high frequency dielectric heating
  • 51 is an antenna for emitting microwaves
  • 52 is a container sealed airtight by acrylic or similar material
  • 53 is a waveguide for microwaves.
  • One end of waveguide 53 is arranged inside sealed container 52.
  • the internal portion of waveguide 53 located inside sealed container 52 is also hermetically sealed by a cover 64 that uses material such as teflon that allows microwaves to pass through on the inside of waveguide 53 located at the boundary between the atmosphere and sealed container 52.
  • Waveguide 53 located within the atmosphere functions as 53a and waveguide 53 located inside sealed container 52 functions as 53b.
  • Fig. 10 54 is an open cylindrical hole that functions to arrange glass tube 10 inside waveguide 53 located within sealed container 52.
  • a heat absorbing element (heating element) 55 comprising silicon or similar material is located on one portion of the circumference of hole 54 (used to arrange the lamp) for the purpose of heating the glass of side tube portion 12b and sealing electrode assembly 13.
  • Heat absorbing element 55 has either a ring shape or a cylindrical shape. Further, heat absorbing element 55 is heated by microwaves and a high temperature occurs within the element.
  • 56 in Fig. 10 is an adiabatic material such as alumina to improve the efficiency of heat absorbing element 55. The adiabatic material 56 encircles the circumference of heat absorbing element 55.
  • 57 in Fig. 10 is a chuck that holds glass tube 10.
  • a motor (not shown in the figure) is connected to chuck 57 and glass tube 10 mounted to chuck 57 rotates in the direction of the circumference of glass tube 10 as shown by arrow 60.
  • chuck 57 is disposed such that it can move up and down by a drive means (not shown in the figure), glass tube 10 mounted to chuck 57 can move up and down its axial direction as indicated by arrow 61.
  • 62 in Fig. 10 is a compressor that functions to increase the pressure inside sealed container 52 to atmospheric pressure or more and 63 is a regulating valve that uniformly maintains the pressure inside sealed container 52.
  • This regulating valve 63 can freely set the pressure inside the sealed container to atmospheric pressure or increase the pressure.
  • the glass of the first portion of side tube portion 12b positioned where electrode 20 is located heats and then the inside diameter of the glass of side tube portion 12b positioned where electrode 20 is located undergoes diameter reduction reaching to the area around electrode 20. This is described in detail below.
  • Atmospheric pressure is maintained inside sealed container 52.
  • chuck 57 is mounted to glass tube 10.
  • one end of side tube portion 12b is held by chuck 57 in order that the axis of heat absorbing element 55 matches the axis of side tube portion 12b.
  • the position of glass tube 10 is adjusted in order that heat absorbing element 55 is opposite to the first portion of side tube portion 12b.
  • glass tube 10 is made to rotate.
  • microwaves generated from magnetron 50 heat-up heat absorbing element 55.
  • heat absorbing element 55 heats the first portion of side tube portion 12b positioned where rotating electrode 20 is located up to the softening point or more which in turn reduces the inside diameter of the first portion reaching to the area around electrode 20.
  • the inside of sealed container 52 is maintained at atmospheric pressure while the interior of the glass tube becomes lower than atmospheric pressure, the glass tube equally reduces the diameter around electrode 20 as shown at the right edge of Fig. 1 halfway down.
  • the heated side tube portion 12b cools to room temperature.
  • the cooling of glass tube 10 can be done inside sealing device 52 or outside sealed container 52.
  • heat absorbing element 55 is brought opposite to the second portion. Then, along with glass tube 10 being rotated, the glass of the second portion of side tube portion 12b positioned where metal foil 21 is located heats. Further, compressor 62 increases the pressure (from 1 to 10 atmospheres) inside sealed container 52 to atmospheric pressure or more. In this manner the second portion is hermetically sealed.
  • the discharge lamp was described as examples in the second and third embodiments, the present invention can be applied to other types of lamps, such as incandescent lamps which employ electrode assembly with an airtight sealing method inside glass.
  • a lamp can be achieved with an excellent high pressure resistant structure that is difficult to crack.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP99109885A 1998-05-25 1999-05-20 Lampe et procédé pour sa fabrication Withdrawn EP0962955A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP14269098 1998-05-25
JP14269098 1998-05-25
JP11107780A JP2000048718A (ja) 1998-05-25 1999-04-15 ランプとランプの製造方法
JP10778099 1999-04-15

Publications (2)

Publication Number Publication Date
EP0962955A2 true EP0962955A2 (fr) 1999-12-08
EP0962955A3 EP0962955A3 (fr) 2002-02-13

Family

ID=26447769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99109885A Withdrawn EP0962955A3 (fr) 1998-05-25 1999-05-20 Lampe et procédé pour sa fabrication

Country Status (2)

Country Link
EP (1) EP0962955A3 (fr)
JP (1) JP2000048718A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1246221A1 (fr) * 2001-03-26 2002-10-02 General Electric Company Procédés de production de tubes à arc à halogénures métalliques scellés par rétrécissement
CN109404816A (zh) * 2018-09-21 2019-03-01 迪亚姆展示设备(昆山)有限公司 一种展示射灯灯架

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003036682A1 (fr) * 2001-10-26 2003-05-01 Toto Ltd. Lampe a decharge a haute intensite, son procede de suppression de la cristallisation/du noircissement, et appareil d'eclairage

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3685880A (en) * 1970-07-06 1972-08-22 Gen Electric Manufacture of lamps of the compact arc discharge type
JPH05159743A (ja) * 1991-12-03 1993-06-25 Koito Mfg Co Ltd アークチューブおよびその製造方法
JPH0817346A (ja) * 1994-06-29 1996-01-19 Stanley Electric Co Ltd 管球のシール方法
US5598063A (en) * 1992-12-16 1997-01-28 General Electric Company Means for supporting and sealing the lead structure of a lamp
DE19710204A1 (de) * 1996-03-12 1997-10-30 Koito Mfg Co Ltd Bogenentladungsröhre, die mit einem Paar von Molybdänfolien versehen ist, und zugehöriges Herstellungsverfahren
EP0866488A1 (fr) * 1997-03-17 1998-09-23 Matsushita Electric Industrial Co., Ltd. Lampe à décharge haute pression et procédé pour sa fabrication
JPH1167093A (ja) * 1997-08-26 1999-03-09 Iwasaki Electric Co Ltd ショートアーク放電ランプの製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3685880A (en) * 1970-07-06 1972-08-22 Gen Electric Manufacture of lamps of the compact arc discharge type
JPH05159743A (ja) * 1991-12-03 1993-06-25 Koito Mfg Co Ltd アークチューブおよびその製造方法
US5598063A (en) * 1992-12-16 1997-01-28 General Electric Company Means for supporting and sealing the lead structure of a lamp
JPH0817346A (ja) * 1994-06-29 1996-01-19 Stanley Electric Co Ltd 管球のシール方法
DE19710204A1 (de) * 1996-03-12 1997-10-30 Koito Mfg Co Ltd Bogenentladungsröhre, die mit einem Paar von Molybdänfolien versehen ist, und zugehöriges Herstellungsverfahren
EP0866488A1 (fr) * 1997-03-17 1998-09-23 Matsushita Electric Industrial Co., Ltd. Lampe à décharge haute pression et procédé pour sa fabrication
JPH1167093A (ja) * 1997-08-26 1999-03-09 Iwasaki Electric Co Ltd ショートアーク放電ランプの製造方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 549 & JP 05 159743 A (KOITO MFG CO LTD) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 05 & JP 08 017346 A (STANLEY ELECTRIC CO LTD) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 08 & JP 11 067093 A (IWASAKI ELECTRIC CO LTD), 9 March 1999 (1999-03-09) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1246221A1 (fr) * 2001-03-26 2002-10-02 General Electric Company Procédés de production de tubes à arc à halogénures métalliques scellés par rétrécissement
CN109404816A (zh) * 2018-09-21 2019-03-01 迪亚姆展示设备(昆山)有限公司 一种展示射灯灯架

Also Published As

Publication number Publication date
JP2000048718A (ja) 2000-02-18
EP0962955A3 (fr) 2002-02-13

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