EP0100091A2 - Keramische Versieglung für Natriumdampfhochdrucklampen - Google Patents

Keramische Versieglung für Natriumdampfhochdrucklampen Download PDF

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Publication number
EP0100091A2
EP0100091A2 EP83107334A EP83107334A EP0100091A2 EP 0100091 A2 EP0100091 A2 EP 0100091A2 EP 83107334 A EP83107334 A EP 83107334A EP 83107334 A EP83107334 A EP 83107334A EP 0100091 A2 EP0100091 A2 EP 0100091A2
Authority
EP
European Patent Office
Prior art keywords
ceramic
plug
inlead
envelope
hermetically sealed
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Withdrawn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
EP83107334A
Other languages
English (en)
French (fr)
Other versions
EP0100091A3 (de
Inventor
Charles Irving Mcvey
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of EP0100091A2 publication Critical patent/EP0100091A2/de
Publication of EP0100091A3 publication Critical patent/EP0100091A3/de
Withdrawn legal-status Critical Current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
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H01J61/366—Seals for leading-in conductors

Definitions

  • a metal cross piece is attached directly to said inlead immediately next to the ceramic plug which extends transversely across the end of the arc tube and physically supports the thermionic electrode joined thereto.
  • the hermetic seal is formed with a liquid slurry of suspended frit particles that is drawn by capillary action with assistance of the cross piece into the free space existing between joined components.
  • the end closure is provided by a ceramic plug inserted into the end of the arc tube which again permits passage of an electrode inlead wire therethrough, and with a hermetic seal being effected between all of the joined members.
  • the modified end closure replaces the single ceramic plug member with a composite assembly of a ceramic disc and ceramic plug that are bonded together with a single frit washer.
  • the substituted ceramic disc has a larger diameter than the inner diameter of the arc tube for butt-sealing engagement with the end of said arc tube and the single frit washer provides sufficient bonding material to hermetically seal all joints in the assembled end closure.
  • Both said ceramic disc and ceramic plug have central openings through which extend an inlead and exhaust tube member for one thermionic electrode which is hermetically sealed at the central opening of said ceramic plug with material provided by the frit washer.
  • the improved high pressure sodium vapor lamp of the present invention thereby includes a tubular light-transmitting ceramic envelope with a pair of thermionic electrodes being sealed at its ends by ceramic closures, wherein the improvement comprises one ceramic plug being inserted into one end of said light-transmitting envelope and being hermetically sealed to the inner wall of said light-transmitting envelope with ceramic sealing frit, said ceramic plug having a central opening through which extends an inlead for one thermionic electrode which is hermetically sealed at said opening with ceramic sealing frit, and having a transverse metal cross piece joined to said inlead at the exterior surface of said ceramic plug while the remaining ceramic closure comprises a ceramic disc having a larger diameter than the inner diameter of said light-transmitting envelope which is hermetically sealed with ceramic sealing frit to the end of said light-transmitting envelope and the surface of a ceramic plug inserted into the end of said light-transmitting envelope, both said ceramic disc and ceramic plug having central openings through which extend an inner lead and exhaust tube member for the remaining thermi
  • both thermionic electrodes comprise refractory metal wire coils wound around a tungsten shank with the metal cross piece extending transversely beyond the inner wall of said light-transmitting envelope so as to physically support one thermionic electrode joined thereto.
  • a representative high pressure sodium vapor lamp 1 corresponding to a 400-watt size with a given lamp voltage drop of about 100 volts is illustrated which comprises a vitreous outer envelope 2 having a standard mogul screw base 3 attached to one end and comprising a reentrant stem press seal 4 through which extend, in conventional fashion, a pair of relatively heavy lead-in conductors 5 and 6 whose outer ends are connected to the screw shell 7 and eyelet 8 of the base.
  • the inner envelope or arc tube 9 centrally located within said outer envelope comprises a length of light-transmitting ceramic tubing, preferably polycrystalline alumina ceramic which is translucent or which can be single crystal alumina which is clear and transparent.
  • the upper end of the arc tube is sealed by a closure structure 10 in accordance with the aforementioned 4,034,252 patent through which extends the niobium inlead wire 11 hermetically sealed.
  • the inlead supports the upper electrode which may be generally similar to the lower electrode and with both of said electrodes being more specifically illustrated in the following FIG. 2-3 embodiments.
  • the external portion of inlead 11 passes through a loop 12 in transverse support wire 13 attached to a side rod 14. This arrangement allows for a thermal expansion of the arc tube during lamp operation when the lower end seal is rigidly fixed in place, and a resilient metal ribbon 15 assures continued good electrical connection.
  • Side rod 14 is welded to lead-in conductor 6 and has its upper end braced by spring clamp 16 which engages inverted nipple 17 in the dome end of the outer vitreous envelope.
  • the lower end closure 20 for said lamp and modified in accordance with the present invention has a central aperture through which extend a thin-walled niobium tube 21 serving as an exhaust tube and as an inlead. Said tube extends but a short distance through the end closure and is hermetically sealed therethrough by sealing frit as will be further explained in the description given for FIG. 3 dealing with said end closure embodiment.
  • the closed arc tube is supported in the outer envelope by connector 22 which is welded across from tubular inlead 21 to a support rod 23 joined to lead-in conductor 5.
  • Upper ceramic closure 10 for the above illustrated lamp embodiment is depicted in greater detail as shown in FIG. 2.
  • said ceramic closure 10 comprises a ceramic plug 24 which is entirely inserted into one end of the arc tube and having a metal cross piece 26, which can be a short wire length, joined to inlead 11 at the exterior surface 28 of said ceramic plug.
  • Said cross piece is bent or arched slightly about its midpoint in a horizontal plane transverse to said inlead in order to have its ends engage the edges of the arc tube diameter and help physically support the thermionic electrode joined thereto.
  • a hermetic seal 29 is formed in the annular recess between the assembled ceramic plug and inner wall of the arc tube as hereinafter further explained.
  • a second hermetic seal 30 is formed at the central opening 32 in ceramic plug 24 and which extends to a ridge of sealing frit 34 on the surface of said plug reaching up to the cross piece 26.
  • All hermetic sealing in the illustrated closure embodiment can be provided with a measured quantity of sealing glass frit being placed on the ceramic plug, suitably as a slurry and the closure assembly then being heated to the melting temperature of the glass frit.
  • the molten frit is drawn by capillary action into the annular free space between the arc tube and ceramic plug as well as into the free space formed between the central opening in said plug with the electrode inlead.
  • Said inlead 11 is joined to a tungsten shank 36 of a conventional thermionic electrode 38 having one or more refractory metal coils wound around which is further described in the aforementioned 4,034,252 patent.
  • said improved ceramic enclosure 20 comprises assembly of a ceramic disc 40 having a larger diameter than the inner diameter of said arc tube 9 which is hermetically sealed with ceramic sealing frit at one end of said arc tube as well as the outermost surface 42 of a ceramic plug 44 which has been inserted into the end of said arc tube.
  • the butt-sealed interface between said ceramic disc 40 and ceramic plug 44 is formed with a ring or washer 46 of ceramic frit material which further provides a hermetic seal 48 to associated electrode structure 50.
  • Said conventional electrode 50 is shown to include part of a metal exhaust tube and inlead member 21 that is inserted through a central opening 52 in both ceramic disc and ceramic plug for hermetic sealing after assembly of said component parts.
  • hermetic sealing 48 between the electrode and ceramic components is generally limited to sealing engagement with the plug member only.
EP83107334A 1982-07-26 1983-07-26 Keramische Versieglung für Natriumdampfhochdrucklampen Withdrawn EP0100091A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40176282A 1982-07-26 1982-07-26
US401762 1982-07-26

Publications (2)

Publication Number Publication Date
EP0100091A2 true EP0100091A2 (de) 1984-02-08
EP0100091A3 EP0100091A3 (de) 1984-10-24

Family

ID=23589129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107334A Withdrawn EP0100091A3 (de) 1982-07-26 1983-07-26 Keramische Versieglung für Natriumdampfhochdrucklampen

Country Status (2)

Country Link
EP (1) EP0100091A3 (de)
JP (1) JPS5978440A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2560435A1 (fr) * 1984-02-29 1985-08-30 Iwasaki Electric Co Ltd Tube photo-emeteur et son procede de production
EP0385243A2 (de) * 1989-03-03 1990-09-05 General Electric Company Natriumdampflampe für Schallpulsebetrieb

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866280A (en) * 1973-12-26 1975-02-18 Gte Sylvania Inc Method of manufacturing high pressure sodium arc discharge lamp
US3992642A (en) * 1975-12-15 1976-11-16 Mcvey Charles I Ceramic envelope plug and lead wire and seal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866280A (en) * 1973-12-26 1975-02-18 Gte Sylvania Inc Method of manufacturing high pressure sodium arc discharge lamp
US3992642A (en) * 1975-12-15 1976-11-16 Mcvey Charles I Ceramic envelope plug and lead wire and seal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2560435A1 (fr) * 1984-02-29 1985-08-30 Iwasaki Electric Co Ltd Tube photo-emeteur et son procede de production
EP0385243A2 (de) * 1989-03-03 1990-09-05 General Electric Company Natriumdampflampe für Schallpulsebetrieb
EP0385243A3 (de) * 1989-03-03 1991-06-05 General Electric Company Natriumdampflampe für Schallpulsebetrieb

Also Published As

Publication number Publication date
JPS5978440A (ja) 1984-05-07
EP0100091A3 (de) 1984-10-24

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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PUAL Search report despatched

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Effective date: 19850412

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Effective date: 19861112

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18D Application deemed to be withdrawn

Effective date: 19890307

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MCVEY, CHARLES IRVING