US3701921A - Electric lamp with refractory metal components connected to molybdenum foils - Google Patents

Electric lamp with refractory metal components connected to molybdenum foils Download PDF

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Publication number
US3701921A
US3701921A US82685A US3701921DA US3701921A US 3701921 A US3701921 A US 3701921A US 82685 A US82685 A US 82685A US 3701921D A US3701921D A US 3701921DA US 3701921 A US3701921 A US 3701921A
Authority
US
United States
Prior art keywords
lamp
molybdenum
foils
molybdenum foils
pinch
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
US82685A
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English (en)
Inventor
Hans Wiedenmann
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Application granted granted Critical
Publication of US3701921A publication Critical patent/US3701921A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/38—Seals for leading-in conductors
    • 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
    • H01J9/28—Manufacture of leading-in conductors

Definitions

  • the present invention relates to an electric lamp comprising an envelope of quartz glass or some other glass of high silica content, having molybdenum foils pinch-sealed into the lamp envelope, and lamp components of a refractory metal, more particularly of molybdenum or tungsten, welded to the two ends of said foils; and to a method for producing the welds.
  • US. Pat No. 3,455,015 describes .a method and device for ultrasonically welding a ductile metal such as aluminum or copper, to a hard material such as glass or other glass-like or ceramic materials, or to a metal such as tungsten or molybdenum.
  • a lamp envelope of quartz, glass or some other glass of high silica content has molybdenum foils pinchsealed into the lamp envelope, and lamp components of a refractory metal, more particularly of molybdenum or tungsten, are welded to the two ends of said foils.
  • lamp components extending externally of the lamp such as leadin wires or base pins, are welded to the pinch-sealed molybdenum foils by interposition of aluminum.
  • the welding is effected by ultrasonics.
  • FIG. 1 is a schematic vertical cross sectional view of an electric lamp such as, for instance, a halogen incandescent lamp in accordance with the invention
  • FIG. 2 shows the same lamp turned about 90
  • FIG. 3 is a schematic diagram of a welding device.
  • the halogen incandescent lamp 1 has a light-transmissive envelope such as quartz glass, one end of which is sealed by an exhaust tip 2 and the other end by flat pinching.
  • the lamp is filled with an inert gas such as nitrogen, and with a halogen additive such as hydrogen bromide.
  • Two molybdenum foils 4 are pinch-sealed into the flat pinch 3, and are welded by ultrasonics to the base ins 7 b usin an aluminum foil 16' as an intermediate ayer.
  • T e tlnc ness of the aluminum foil may be up to 0.1 mm.
  • the thickness of the molybdenum foils is about 15 to 60 u.
  • the ends of a tungsten filament 5 are welded to the molybdenum foils 4 in known manner by using an intermediate layer 6 of aluminum.
  • the aluminum may be used in form of a foil or as a powder, which is formed to a paste. by a volatile vehicle.
  • the welding of the filament ends to the molybdenum foils 4 is effected by ultrasonics.
  • FIG. 3 is a schematic view of an ultrasonic generator 8 with a mechanical amplitude transformer, or horn 9, for instance of steel.
  • the horn has a bore 10, into which a cylindrical body 11, for instance of steel, with a frustoconical tip 12 is inserted.
  • a hard body 14 consist-' ing for instance of sintered alumina, with a particle size of from 3 to 5 11., is pressed into a bore 13 of tip 12.
  • the flat pinched end portion of the base pin 7 is laid on an anvil 15 of hard metal.
  • An aluminum foil 16 is located on the base pin, and thereon the molybdenum foil 4.
  • aluminum powder mixed with ethanol to form a paste may also be used.
  • the molybdenum foil and the base pin are overlapping by up to approximately 5 mm. Then the components are welded by ultrasonics at a horn pressure of 25 40 kg/cm
  • the rough surface of the alumina body 14 prevents v gliding ofthe horn tip on the molybdenum foil during operation.
  • the improvement comprising aluminum interposed, at the weld, between the pinch-sealed molybdenum foils and at least the elements extending externally of the lamp.
  • Lamp according to claim I wherein the interposed aluminum is a layer of aluminum foil of up to 0.1 mm. thickness.
  • Lamp according to claim 1 wherein the thickness of the pinch-sealed molybdenum foils is about 15 to 60 4. Lamp according to claim 1 wherein the lamp has internally positioned elements and aluminum is interposed in welds between the pinch-sealed molybdenum foils and the elements positioned internally of the lamp. 5. Lamp according to claim 1, wherein the elements of refractory metal include molybdenum and tungsten.
  • Lamp according to claim 1 wherein the elements of refractory material include lead-in wires or base pins.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
US82685A 1969-11-10 1970-10-21 Electric lamp with refractory metal components connected to molybdenum foils Expired - Lifetime US3701921A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1956484A DE1956484B2 (de) 1969-11-10 1969-11-10 Elektrische Lampe und Verfahren zu deren Herstellung

Publications (1)

Publication Number Publication Date
US3701921A true US3701921A (en) 1972-10-31

Family

ID=5750662

Family Applications (1)

Application Number Title Priority Date Filing Date
US82685A Expired - Lifetime US3701921A (en) 1969-11-10 1970-10-21 Electric lamp with refractory metal components connected to molybdenum foils

Country Status (6)

Country Link
US (1) US3701921A (fr)
BE (1) BE758666A (fr)
DE (1) DE1956484B2 (fr)
FR (1) FR2069197A5 (fr)
GB (1) GB1301499A (fr)
NL (1) NL7015784A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4136298A (en) * 1977-08-15 1979-01-23 General Electric Company Electrode-inlead for miniature discharge lamps
US5256097A (en) * 1990-11-07 1993-10-26 Licentia Patent-Verwaltungs-Gmbh Process for producing a directly heated cathode
US20060124694A1 (en) * 2002-12-09 2006-06-15 Ingo Dunisch Composite body and method for producing a mechanical joint

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7403204A (nl) * 1974-03-11 1975-09-15 Philips Nv Elektrische lamp.
HU186219B (en) * 1983-01-12 1985-06-28 Tungsram Reszvenytarsasag Method for producing the two-spot welded joints of high-melting pole-foil-pole conductors flattened into hard glass

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341716A (en) * 1943-01-07 1944-02-15 Eitel Mccullough Inc Welded joint and method of making the same
US3346768A (en) * 1964-10-29 1967-10-10 Gen Electric Incandescent lamp with a fuse integral with the lead-in structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341716A (en) * 1943-01-07 1944-02-15 Eitel Mccullough Inc Welded joint and method of making the same
US3346768A (en) * 1964-10-29 1967-10-10 Gen Electric Incandescent lamp with a fuse integral with the lead-in structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4136298A (en) * 1977-08-15 1979-01-23 General Electric Company Electrode-inlead for miniature discharge lamps
US5256097A (en) * 1990-11-07 1993-10-26 Licentia Patent-Verwaltungs-Gmbh Process for producing a directly heated cathode
US20060124694A1 (en) * 2002-12-09 2006-06-15 Ingo Dunisch Composite body and method for producing a mechanical joint
US20100136872A1 (en) * 2002-12-09 2010-06-03 Perkinelmer Optoelectronics Gmbh & Co. Kg Compound Body and a Process for the Production of a Mechanical Connection
US7955153B2 (en) 2002-12-09 2011-06-07 Xenon Technologies (Germany) Gmbh Compound body and a process for the production of a mechanical connection

Also Published As

Publication number Publication date
GB1301499A (fr) 1972-12-29
DE1956484A1 (de) 1971-05-19
DE1956484B2 (de) 1978-04-20
FR2069197A5 (fr) 1971-09-03
BE758666A (fr) 1971-04-16
NL7015784A (fr) 1971-05-12

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