EP1202324A1 - Ampoule en matière céramique pour lampe à décharge de grande puissance - Google Patents

Ampoule en matière céramique pour lampe à décharge de grande puissance Download PDF

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Publication number
EP1202324A1
EP1202324A1 EP01309263A EP01309263A EP1202324A1 EP 1202324 A1 EP1202324 A1 EP 1202324A1 EP 01309263 A EP01309263 A EP 01309263A EP 01309263 A EP01309263 A EP 01309263A EP 1202324 A1 EP1202324 A1 EP 1202324A1
Authority
EP
European Patent Office
Prior art keywords
section
electric discharge
barrel section
light emitting
ceramic envelope
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Withdrawn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
EP01309263A
Other languages
German (de)
English (en)
Inventor
Sugio c/o NGK Insulators Ltd. Miyazawa
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.)
NGK Insulators Ltd
Original Assignee
NGK Insulators 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 NGK Insulators Ltd filed Critical NGK Insulators Ltd
Publication of EP1202324A1 publication Critical patent/EP1202324A1/fr
Withdrawn legal-status Critical Current

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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
    • H01J61/30—Vessels; Containers

Definitions

  • the present invention relates to a ceramic envelope made of a light transmission ceramics used for a high intensity discharge lamp such as high pressure sodium lamp or a metal halide lamp.
  • an electric discharge lamp using a ceramic envelope made of light transmission ceramics is widely used as a ceramics metal halide lamp.
  • an electric discharge light emitting space is formed in a cylindrical shape.
  • a ceramic envelope has a structure as shown in FIG. 3A and FIG. 3B, i.e., a cylindrical barrel section 10 forming an electric discharge light emitting space at its center. Its left and right ends are closed by an annular closing material 11, and its structure is provided such that a capillary tube 12 is connected in facing opposite to each other at the substantial center of the closing material 11. Then, after a light emitting substance or startup gas is sealed in an electric discharge light emitting space, an electrode is inserted into the capillary tube 12, and is sealed, thereby forming an electric discharge lamp.
  • These sections such as the barrel section 10, closing plate 11, and capillary tube 12 are each molded independently, and are integrally coupled with each other, thereby forming a ceramic envelope.
  • a temperature at a corner part of a cylinder is the lowest during lighting.
  • a light emitting substance which is a corrosive substance, easily accumulates at that site.
  • corrosion at the corner is easily advanced because the light emitting substance easily accumulates. The corrosion at that portion determines a service life of the lamp.
  • FIG. 3A which is a partially enlarged view of the envelope, a wedge shaped cavity 13 is easily formed at a bonding section.
  • a light emitting substance easily enters the cavity 13 generated at the corner of the barrel section 10, which causes corrosion, and impairs extended service life.
  • such a wedge shaped cavity easily causes stress concentration, and extended service life is impaired due to a thermal stress generated during lighting.
  • the present invention has been made in order to solve the foregoing problem. It is an object of the present invention to provide a ceramic envelope for high intensity light emitting lamp capable of extending the service life of the lamp even if an electric discharge light emitting space is formed in a cylindrical shape.
  • a ceramic envelope made of a light transmission ceramics for high intensity discharge lamp comprising a cylindrical barrel section that forms an electric discharge light emitting space, an annular closing section that closes both ends of the barrel section, and a capillary section that inserts and fixes an electric discharge electrode to be outwardly protruded so as to be opposed to each other from the substantial center of both closing sections.
  • R is provided at an end of an interior face of the barrel section that is a boundary part between said barrel section and closing section, thereby avoiding a factor for impairing extended service life due to generation of the wedge shaped cavity section.
  • the R value is from 0.01 mm to 2.0 mm.
  • FIG. 1 is an illustrative cross section of a ceramic envelope for high intensity discharge lamp illustrating one embodiment of the present invention.
  • FIG. 2 is an illustrative cross section of a ceramic envelope for high intensity discharge lamp illustrating another embodiment of the present invention.
  • FIG. 3A and FIG. 3B are illustrative cross sections of a conventional ceramic envelope for high intensity discharge lamp, in which reference numeral 1 denotes a barrel section, reference numeral 2 denotes a capillary section, and reference numeral 3 denotes a boundary part.
  • FIG. 1 an example of a ceramic envelope for high intensity discharge according to the present invention is shown.
  • This envelope has a cylindrical barrel section 1 that forms an electric discharge light emitting space at its center. Its both ends are closed by an annular closing sections 2, 2, and capillary sections 3, 3 having their small diameters are brought into protrusive contact with each other so as to be in parallel to the barrel section 1 from the center of the closing section 2 and so as to be opposed to each other.
  • This capillary section 3 is intended to insert, seal, and fix a rod shaped electrode conductor (not shown) having an electric discharge electrode provided at its tip end.
  • each of which is made of an alumina-based material, are molded, assembled, and fired, whereby they are formed so as to have light transmission properties.
  • An example of dimensions of each section is shown here.
  • An outer diameter D1 of the barrel section 1 is 11.6 mm
  • an inner diameter D2 is 9.4 mm
  • a length L1 is 19 mm
  • thickness W1 of the closing section is 3 mm
  • a full length L2 of a light emitting tube is 47 mm.
  • a rounded concave corner is provided to join smoothly the inner face of the barrel portion and the inner face of the closing section.
  • This concave corner as seen in axial section of the envelope, has a diameter of curvature R of 1.0 mm. This rounded corner prevents generation of a wedge at the electric discharge light emitting space corner.
  • the R value causes small effect if the value is smaller than 0.01 mm.
  • it exceeds 2.0 mm the lamp efficiency is lowered due to an increase of ceramics capacitance, and further, light emission substance hardly accumulates at the corner. Consequently, advantageous effect of the cylindrical shaped electric discharge light emitting space is lowered.
  • the value ranging from 0.01 mm to 2.0 mm is preferable.
  • the value ranging from 0.3 mm to 1.0 mm is more preferable.
  • FIG. 2 shows another embodiment of the present invention.
  • the figure also shows a case in which the entirety of the barrel section 1, closing section 2, and capillary section 3 are integrally molded. Materials and outward forms are the same as described in the above embodiments.
  • the barrel section, closing section, and capillary section can be easily molded without any interface as compared with the above embodiments. This is because the entire water content ratio or partial water content ratio as well as the composition of each section must be finely adjusted so as to generate no interface in the above embodiments.
  • R may be provided at only one site of the left and right corners of the electric discharge light emitting space.
  • a light emitting substance easily accumulates at one side of the bottom part.
  • R may be provided at downward side.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
EP01309263A 2000-10-31 2001-10-31 Ampoule en matière céramique pour lampe à décharge de grande puissance Withdrawn EP1202324A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000333372 2000-10-31
JP2000333372A JP2002141020A (ja) 2000-10-31 2000-10-31 高圧放電灯用発光容器

Publications (1)

Publication Number Publication Date
EP1202324A1 true EP1202324A1 (fr) 2002-05-02

Family

ID=18809466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01309263A Withdrawn EP1202324A1 (fr) 2000-10-31 2001-10-31 Ampoule en matière céramique pour lampe à décharge de grande puissance

Country Status (4)

Country Link
EP (1) EP1202324A1 (fr)
JP (1) JP2002141020A (fr)
CN (1) CN1351367A (fr)
HU (1) HUP0104628A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002071442A1 (fr) * 2000-11-06 2002-09-12 General Electric Company Chambre a decharge en ceramique destinee a une lampe a decharge et procedes de fabrication associes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1314074C (zh) * 2002-03-20 2007-05-02 松下电器产业株式会社 金属卤化物灯
JPWO2005096347A1 (ja) * 2004-03-31 2007-08-16 松下電器産業株式会社 メタルハライドランプおよびこれを用いた照明装置
JP2008243721A (ja) * 2007-03-28 2008-10-09 Harison Toshiba Lighting Corp 放電ランプ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1360340A (en) * 1971-09-06 1974-07-17 Degussa Burner housing
JPS6020446A (ja) * 1983-07-14 1985-02-01 Mitsubishi Electric Corp ランプ
EP0220633A1 (fr) * 1985-10-25 1987-05-06 General Electric Company Chambre à arc électrique asymétrique pour lampe à décharge
EP0284576A2 (fr) * 1987-03-23 1988-09-28 Lumalampan Aktiebolag Tube à décharge à gaz compact et une méthode pour sa fabrication
EP0722183A2 (fr) * 1995-01-13 1996-07-17 Ngk Insulators, Ltd. Lampes à décharge haute tension
US5635794A (en) * 1992-05-26 1997-06-03 Patent-Treuhand-Gesellschaft Fur Elektrische Gluehlampen Mbh Breakage resistant mercury vapor low-pressure discharge lam, particularly compact fluorescent lamp
JPH10247476A (ja) * 1997-02-28 1998-09-14 Toshiba Lighting & Technol Corp 管球、光源装置、投光装置ならびにプロジェクタ装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1360340A (en) * 1971-09-06 1974-07-17 Degussa Burner housing
JPS6020446A (ja) * 1983-07-14 1985-02-01 Mitsubishi Electric Corp ランプ
EP0220633A1 (fr) * 1985-10-25 1987-05-06 General Electric Company Chambre à arc électrique asymétrique pour lampe à décharge
EP0284576A2 (fr) * 1987-03-23 1988-09-28 Lumalampan Aktiebolag Tube à décharge à gaz compact et une méthode pour sa fabrication
US5635794A (en) * 1992-05-26 1997-06-03 Patent-Treuhand-Gesellschaft Fur Elektrische Gluehlampen Mbh Breakage resistant mercury vapor low-pressure discharge lam, particularly compact fluorescent lamp
EP0722183A2 (fr) * 1995-01-13 1996-07-17 Ngk Insulators, Ltd. Lampes à décharge haute tension
JPH10247476A (ja) * 1997-02-28 1998-09-14 Toshiba Lighting & Technol Corp 管球、光源装置、投光装置ならびにプロジェクタ装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 136 (E - 320) 12 June 1985 (1985-06-12) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 14 31 December 1998 (1998-12-31) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002071442A1 (fr) * 2000-11-06 2002-09-12 General Electric Company Chambre a decharge en ceramique destinee a une lampe a decharge et procedes de fabrication associes

Also Published As

Publication number Publication date
JP2002141020A (ja) 2002-05-17
HUP0104628A3 (en) 2002-12-28
CN1351367A (zh) 2002-05-29
HU0104628D0 (en) 2002-01-28
HUP0104628A2 (en) 2002-06-29

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