US2409361A - Seal for electric lamps and similar devices - Google Patents

Seal for electric lamps and similar devices Download PDF

Info

Publication number
US2409361A
US2409361A US528661A US52866144A US2409361A US 2409361 A US2409361 A US 2409361A US 528661 A US528661 A US 528661A US 52866144 A US52866144 A US 52866144A US 2409361 A US2409361 A US 2409361A
Authority
US
United States
Prior art keywords
electrode
seal
core
foil
strips
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.)
Expired - Lifetime
Application number
US528661A
Other languages
English (en)
Inventor
Kettlewell Eric
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
Application granted granted Critical
Publication of US2409361A publication Critical patent/US2409361A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/32—Seals for leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0011—Non-emitting electrodes

Definitions

  • This invention relates to devices of a type comprising an envelope of quartz or similar refractory or vitreous material with an electrode therein and means of current lead connection to the exterior sealed through a part of the envelope structure.
  • the invention involves novelty in methods of manufacture, as well as in construction. The invention is especially applicable to 2 Claims. (of. 49-925) high pressure metal vapor discharge devices, in-
  • a quartz envelope device in accordance with the invention, in the form hereinafter described, (1) a part of a refractory metal electrode member (preferably cylindrical) is wrapped with thin refractory sheet metal or foil, which is welded to the electrode at a plurality of places, (2) thin strips of refractory sheet metal or foil adapted for a strip seal are attached and electrically connected to the wrapping, and thus to the electrode, (3) the electrode and a quartz core in line with it are placed within a quartz tube or sleeve with the metal strips extending outward along the core, between the same and said tube, and (4) the said tube (or part of it) is collapsed upon the enclosed core and strips, and even on the foil-enveloped portion of the electrode.
  • steps (1) and (2) are immaterial, and uniting the strips and the electrode wrapping may be understood to include an original integral union left unsevered: for example, the foil wrapping and the strips may be cut out of the same sheet of metal in one piece and part of this piece wrapped around the electrode end, leaving the strips projecting therefrom as tags or streamers, the wrapped portion being welded to the electrode.
  • the quartz core have substantially the same external shape of cross-section as the adjacent end portion of the electrode-for instance, if the electrode is a cylindrical rod, the core may be a rod or tube of about the same external diameter-and-that the quartz sleeve should be collapsed upon most or all the wrapped part of the electrode. It is generally undesirable to collapse quartz upon the unwrapped part of the electrode.
  • Fig. 1 is a perspective or tilted side view of an electrode assembly constructed as above indicated;
  • Fig. 2 is a side view of a complete discharge device embodying this electrode;
  • Fig. 3 is a fragmentary, sectioned elevation of the electrode assembly; and
  • Fig. 4 is a perspective view of a modification of the foil lead-in conductor.
  • a relatively massive refractory metal electrode of a high pressure metal vapor electric lamp is shown as a tungsten rod or cylinder I, which may be 30 mm. long and 7 /2 mm. in diameter, for example.
  • Refractory sheet metal or foil for the electrode wrapping and the seal strips may consist of molybdenum sheet 0.015 mm. thick.
  • a band 2 of this foi1 (15 mm. wide, for example) is wrapped around one end of the electrode member I and welded to it.
  • Two strips 3, 3 of the sheet molybdenum (each 10 mm. wide and 40 mm.
  • each strip is welded at one end to the wrapping 2, while at the other end each strip is welded to a stout external wire lead 4, which may be multistranded as shown.
  • a cylindrical quartz rod also 7 /2 mm. in diameter
  • the core 5 in alignment with the electrode rod l-and as shown forming as it were a prolongation of the electrode-the lead strips 3, 3 and the core 5 are both inserted or fitted into a quartz tube or sleeve 6 (of suitable internal bore), so that the strips lie between the core and the tube, the wrapped end of the electrode I being also inserted or fitted into the end of the tube.
  • the tube or sleeve 6 is collapsed, by heating and softening it, over the whole distance from the boundary between the wrapped and unwrapped portions of the electrode l to slightly beyond the junction of strips 3, 3 and leads 4, 4, and is interfused and sealed with the core 5 within it.
  • Fig. 4 shows a modification of the foil lead-in conductor wherein the wrapped portion 2 and the ribbons or streamers 3' (corresponding to the portions 2 and 3 in Fig. 3) are cut out of'the same sheet of metal in one piece.
  • :refractory envelope material similar to quartz includes any highly silicious vitreous material which'has a coeflicient of expansion of not more substantially than 1L5 per degree centigradeas comp "with a correspondingcoeflicient of expansioniof 055x10 per degree centigrade for-fused quartz 'or quartz glass itself.
  • a seal of the class described the combination of a metallic rod-like electrode and a core member of vitreous material of substantially the same diameter aligned in abutting end-to-end relation,,a metallic, foil conductor including a portion wrapped around the end of said electrode adjacent said core member and another portion extending therefrom longitudinally of said core .1 member," and asleeve of vitreous material fused around said core member and the portion of said v.electrodewhich iswrapped with foil, said foil .;conductor.,being. embedded in the fused seal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US528661A 1942-04-03 1944-03-30 Seal for electric lamps and similar devices Expired - Lifetime US2409361A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4474/42A GB577822A (en) 1942-04-03 1942-04-03 Improvements in quartz envelopes having electrical leads sealed through them

Publications (1)

Publication Number Publication Date
US2409361A true US2409361A (en) 1946-10-15

Family

ID=9777860

Family Applications (1)

Application Number Title Priority Date Filing Date
US528661A Expired - Lifetime US2409361A (en) 1942-04-03 1944-03-30 Seal for electric lamps and similar devices

Country Status (6)

Country Link
US (1) US2409361A (enrdf_load_stackoverflow)
BE (1) BE463278A (enrdf_load_stackoverflow)
ES (1) ES172539A1 (enrdf_load_stackoverflow)
FR (1) FR920977A (enrdf_load_stackoverflow)
GB (1) GB577822A (enrdf_load_stackoverflow)
NL (1) NL67310C (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2504521A (en) * 1948-05-01 1950-04-18 Gen Electric Quartz-to-metal seal
US2504522A (en) * 1948-07-29 1950-04-18 Gen Electric Quartz-to-metal seal
US2583388A (en) * 1947-05-01 1952-01-22 Gen Electric Conducting seal for high-pressure lamps
US2659964A (en) * 1947-09-01 1953-11-24 Gen Electric Method of making quartz-to-metal seals
US2670399A (en) * 1949-08-12 1954-02-23 Westinghouse Electric Corp High-pressure gaseous discharge lamp
US3379822A (en) * 1964-07-18 1968-04-23 Philips Corp Electric conductor suitable for being sealed in the wall of an electric discharge tube
EP1376653A3 (en) * 2002-06-24 2007-01-17 Matsushita Electric Industrial Co., Ltd. Metal halide lamp

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2583388A (en) * 1947-05-01 1952-01-22 Gen Electric Conducting seal for high-pressure lamps
US2659964A (en) * 1947-09-01 1953-11-24 Gen Electric Method of making quartz-to-metal seals
US2504521A (en) * 1948-05-01 1950-04-18 Gen Electric Quartz-to-metal seal
US2504522A (en) * 1948-07-29 1950-04-18 Gen Electric Quartz-to-metal seal
US2670399A (en) * 1949-08-12 1954-02-23 Westinghouse Electric Corp High-pressure gaseous discharge lamp
US3379822A (en) * 1964-07-18 1968-04-23 Philips Corp Electric conductor suitable for being sealed in the wall of an electric discharge tube
EP1376653A3 (en) * 2002-06-24 2007-01-17 Matsushita Electric Industrial Co., Ltd. Metal halide lamp

Also Published As

Publication number Publication date
BE463278A (enrdf_load_stackoverflow)
FR920977A (fr) 1947-04-23
ES172539A1 (es) 1946-03-16
NL67310C (enrdf_load_stackoverflow)
GB577822A (en) 1946-06-03

Similar Documents

Publication Publication Date Title
US2876377A (en) Ribbon seal and method of fabrication
US2572993A (en) Crystal contact device
US2409361A (en) Seal for electric lamps and similar devices
US3140417A (en) Electric lamp stem with strain relieving sleeve
US2682009A (en) Seal and method of fabrication
US3014196A (en) Lamp base
US4510416A (en) Filament support for tubular lamp
US2504521A (en) Quartz-to-metal seal
US3286118A (en) Electric incandescent lamps
US2159794A (en) Electric lamp and similar devices
US2477372A (en) Electric gaseous discharge lamp
EP0160316B1 (en) Single-ended high intensity discharge lamp and manufacture
US2114869A (en) Quartz-to-metal seal
US4668204A (en) Single-ended high intensity discharge lamp and manufacture
US3351803A (en) Seal and lead-in conductor assembly for gaseous discharge lamps
US2138224A (en) Method of sealing electrical conductors into vitreous envelopes
US2845557A (en) Arc tube mounting
GB721621A (en) Improvements in and relating to graded gas-tight seals
US3515929A (en) Short arc lamp seal
US3278778A (en) High-current seal for electric discharge lamp
US2245394A (en) Hermetic seal
US2408239A (en) Electronic discharge device
US5001395A (en) High-pressure discharge lamp with corrosion protected electrode leads
US3265922A (en) Electric lamp
US2251062A (en) Hermetic seal