US3810684A - Lamps - Google Patents

Lamps Download PDF

Info

Publication number
US3810684A
US3810684A US00211490A US21149071A US3810684A US 3810684 A US3810684 A US 3810684A US 00211490 A US00211490 A US 00211490A US 21149071 A US21149071 A US 21149071A US 3810684 A US3810684 A US 3810684A
Authority
US
United States
Prior art keywords
tube
lamp
passage
lead
bulb
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
US00211490A
Other languages
English (en)
Inventor
K Robinson
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.)
EMI Group Ltd
Original Assignee
Thorn Electrical Industries 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
Priority claimed from GB940071*[A external-priority patent/GB1354601A/en
Application filed by Thorn Electrical Industries Ltd filed Critical Thorn Electrical Industries Ltd
Application granted granted Critical
Publication of US3810684A publication Critical patent/US3810684A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/26—Closing of vessels
    • 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

Definitions

  • ABSTRACT applying pressure to the inside of the envelope during pinching through the passage the envelope can be forced against the inside of a mould. Subsequently the passage is closed.
  • the manufacture requires, a relatively large number of successive steps during each of which the lamp has to be mounted in a holding device. This-is even more marked with'doubIe-ended lamps in which a seal has to bev formed at each end of the lamp, and the exhaust stem must be joined to the side of the tube as a preliminary step. Consequently, accurate alignment:
  • the invention has for an object the. provision of a simplified and improved process for the manufacture of lamps which is not subject to the above-noted disadvantages.
  • the invention provides a process ormethod of making a lamp which comprises inserting a filament or electrode assembly having lead-in conductors into'a lamp:
  • a pinch seal is formed in theenvelope around the lead-in conductors with a relatively small passage remaining through the seal, and. the atmo-. sphere in the envelope is adjusted through said passage.
  • Said step of adjusting the atmosphere in the envelope may comprise dosing and pumping of the lamp, as is done with conventional lamps.
  • the envelope can be forced against the inside of a'mould, so that the envelope can have a variety of shapes determined by the shape of the mould.
  • FIG. 4' is a perspective view of the lamp of FIGQZ with an associated shield and contact member;
  • FIG. 7 isaside viewof a single-ended discharge lamp embodying the invention.
  • FIGS. l0andll are side and end views respectively of a double-ended projectiontype lamp with a bulb of elliptical cross-section to reduce distortion;
  • FIGS. l2f'and13 are side andend views respectively of a double-endedlamp in which the bulb acts as a reflector
  • FIG. l4 is a side view of a double-ended Xenon' lamp having an isothermal bulb.
  • FIG. I shows a partially-made incandescent lamp which is-formed from a section of tubing 10.
  • the lamp includes filaments '12, leads '14, and molybdenum sealing foilslfi'which are-all of well-known-type.
  • two pinch seals 18 and 20 are formed in the tube l0.
  • the pinch seal 18' is located at an end of the tube and forms a hermetic seal at that end of the tube.
  • the seal 20 is formed intermediate the ends of the tube an d forms a hermetic seal over the greater part of the cross-section of the tube 10.
  • seal 20 is not'complete, in that a small passage 22 is left unsealed which provides a connecting path between the interior of the tube between the seals 18 and 20and the part of the tube located on the other side of the seal 20.
  • Each of theseals l8and 20 surrounds and retains re spectiveones of the lead-in wires l4*-and sealing foils l6;
  • the pinch seals 18 and 20 are formed by means of the mould shown in FIGS. Sand 6 which includes jaws 24 and 26 relatively moveable -in the direction of the arrow A; A central portion 28 of the mould void is generally cylindrical, and the ends 30 of the mould serve to flatten the tube 10 to form the seals 18and 20.
  • a relief in one end of the jaw 26 as indicated at 32; provides for the passage 22 through the seal 20. ltwill be appreciated that either or both of the jaws 24 and 26 may be relieved in this manner.
  • the manufacture of the lamp shown in FIG, 1 thus proceeds 'asfollows.
  • the internal components are placed within the open end of the tube 10, which is positioned between the jaws 24 and 26. While the internal components are held in their desired positioned, the seal areas are heated to plasticity and the jaws 24 and 26 are brought together to form the seal 18, and the seal 20 with the passageway 22.
  • the exhaust tube is removed from the pump compression head and the lamp cut or broken off from the excess tube to leave the finished lamp as shown in FIG. 3.
  • Mercury lamps are not, in general, pressure filled and to avoid any possible retention of mercury in the passage 22, the passage 22 is preferably sealed close to its inner end in such bulbs. During all these operations the sealing foils 16 and lead wires 14 in close proximity to the seal off point are fully protected against oxidisation by being enclosed within the exhaust tube.
  • FIG. 4 shows the finished lamp 40 of FIG. 3 for use as a twin-filament automobile lamp having a bulb contoured to fit a metal shield 42 for dipped beam light control.
  • An eyelet 44 is fixed over the lead 46 to attach the shield 42 over the lead.
  • the interior of the envelope 34 may be subjected to pressure to blow the envelope 34 out to fill the central mould cavity 28.
  • various bulb shapes can be achieved with high accuracy of bulb dimensions.
  • FIG. 7 shows a single-ended discharge lamp with a single pinch seal.
  • FIGS. 8 and 9 illustrate a double-ended bulb with a flat grid filament and a flattened tubular cross-section of the bulb around the filament.
  • the small bulb volume obtained permits high operating pressures and hence improved life.
  • the bulb of FIGS. 10 and 11 has an elliptical crosssection around the filament, to reduce distortion in a projection application, while that of FIGS. 12 and 13 is flattened on one side 50 of the bulb to reduce distortion, the other side 52 being spherical or paraboloidal and acting as a reflector or shield.
  • FIG. 14 shows an isothermal bulb for a mercury or Xenon compact source discharge lamp.
  • the assembly may be held in the exhaust head during pinching while clean gas is flushed through the tube.
  • exhausting can commence immediately before the bulb and seals cool appreciably enabling outgassing to take place at temperatures higher than can be achieved by conventional methods.
  • the moulding of the bulb shape and pinch seal produces high accuracy in the internal diameter of the bulb, despite variations of wall thickness from one tube to the next. Variation of internal diameter can lead to wide variations in the'final pressure in high pressure filling. Referring to FIG. 6, the final spacing X between the jaw faces across the pinch seal will depend upon the tube wall thickness. Consequently the external diameter Y of the bulb formed in the mould will increase with the tube wall thickness whereas its internal diameter will remain approximately constant.
  • the invention may be used wholey or in part in the manufacture of many different types of incandescent or discharge lamps, including in particular high pressure vapour or gas discharge lamps, linear or single ended halogen projector or automobile lamps, having fused silica (quartz) or vitreous envelopes.
  • a method of making a lamp comprising the steps of:
  • step of adjusting the atmosphere in said tube includes applying pressure to the inside of said tube to force said tube against the inside of a mould.
  • a method as claimed in claim 1, wherein said step of adjusting the atmosphere in said tube comprises dosing and pumping said lamp.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Drying Of Solid Materials (AREA)
US00211490A 1971-04-14 1971-12-23 Lamps Expired - Lifetime US3810684A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB940071*[A GB1354601A (en) 1971-04-14 1971-04-14 Lamps
GB1729071 1971-05-26

Publications (1)

Publication Number Publication Date
US3810684A true US3810684A (en) 1974-05-14

Family

ID=26242911

Family Applications (1)

Application Number Title Priority Date Filing Date
US00211490A Expired - Lifetime US3810684A (en) 1971-04-14 1971-12-23 Lamps

Country Status (7)

Country Link
US (1) US3810684A (enrdf_load_stackoverflow)
CA (1) CA934437A (enrdf_load_stackoverflow)
DE (1) DE2218242C3 (enrdf_load_stackoverflow)
IT (1) IT951380B (enrdf_load_stackoverflow)
NL (1) NL158018B (enrdf_load_stackoverflow)
NO (1) NO131107C (enrdf_load_stackoverflow)
SE (1) SE385345B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369371A3 (de) * 1988-11-15 1991-06-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zur Herstellung eines Lampengafässes
US5037342A (en) * 1988-11-15 1991-08-06 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen M.B.H. Method of making an electric lamp, and more particularly a lamp vessel in which electrodes are retained in the lamp by a pinch or press seal
EP0809277A3 (en) * 1996-05-24 1998-03-11 Yumiko Nishibori Method of sealing halogen lamp
EP0801417A3 (en) * 1996-04-10 1999-05-06 Yumiko Nishibori Double-ended type halogen lamp and method of making the same
EP1063672A1 (en) * 1999-06-23 2000-12-27 Matsushita Electronics Corporation Method for manufacturing a lamp
EP1304715A3 (en) * 2001-09-26 2006-05-17 Osram-Sylvania Inc. Method of removing contaminants from a double ended arc discharge tube
WO2007110320A3 (de) * 2006-03-28 2007-11-22 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektrische lampe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2201694A (en) * 1937-05-15 1940-05-21 Gen Electric Method and apparatus for manufacturing electric lamps and similar articles
US2235515A (en) * 1938-07-15 1941-03-18 Westinghouse Electric & Mfg Co Manufacture of miniature lamps
US2450197A (en) * 1945-12-29 1948-09-28 Sylvania Electric Prod Electric discharge device
US2900771A (en) * 1958-01-28 1959-08-25 Gen Electric Electric lamp gas filling and sealing method and apparatus
US2904716A (en) * 1955-11-28 1959-09-15 Gen Electric Electric incandescent lamp and method of manufacture
US3073137A (en) * 1960-02-01 1963-01-15 Westinghouse Electric Corp Press sealing process and apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2201694A (en) * 1937-05-15 1940-05-21 Gen Electric Method and apparatus for manufacturing electric lamps and similar articles
US2235515A (en) * 1938-07-15 1941-03-18 Westinghouse Electric & Mfg Co Manufacture of miniature lamps
US2450197A (en) * 1945-12-29 1948-09-28 Sylvania Electric Prod Electric discharge device
US2904716A (en) * 1955-11-28 1959-09-15 Gen Electric Electric incandescent lamp and method of manufacture
US2900771A (en) * 1958-01-28 1959-08-25 Gen Electric Electric lamp gas filling and sealing method and apparatus
US3073137A (en) * 1960-02-01 1963-01-15 Westinghouse Electric Corp Press sealing process and apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369371A3 (de) * 1988-11-15 1991-06-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zur Herstellung eines Lampengafässes
US5037342A (en) * 1988-11-15 1991-08-06 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen M.B.H. Method of making an electric lamp, and more particularly a lamp vessel in which electrodes are retained in the lamp by a pinch or press seal
EP0801417A3 (en) * 1996-04-10 1999-05-06 Yumiko Nishibori Double-ended type halogen lamp and method of making the same
EP0809277A3 (en) * 1996-05-24 1998-03-11 Yumiko Nishibori Method of sealing halogen lamp
EP1063672A1 (en) * 1999-06-23 2000-12-27 Matsushita Electronics Corporation Method for manufacturing a lamp
US6685525B1 (en) 1999-06-23 2004-02-03 Matsushita Electric Industrial Co., Ltd. Method for manufacturing an incandescent lamp
EP1304715A3 (en) * 2001-09-26 2006-05-17 Osram-Sylvania Inc. Method of removing contaminants from a double ended arc discharge tube
WO2007110320A3 (de) * 2006-03-28 2007-11-22 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektrische lampe
US20090167180A1 (en) * 2006-03-28 2009-07-02 Osram Gesellschaft mit beschränkter Haftung Electric Lamp

Also Published As

Publication number Publication date
SE385345B (sv) 1976-06-21
DE2218242C3 (de) 1978-06-01
IT951380B (it) 1973-06-30
NL158018B (nl) 1978-09-15
DE2218242B2 (de) 1977-10-13
DE2218242A1 (de) 1972-11-02
CA934437A (en) 1973-09-25
NO131107B (enrdf_load_stackoverflow) 1974-12-23
NL7205011A (enrdf_load_stackoverflow) 1972-10-17
NO131107C (enrdf_load_stackoverflow) 1975-04-02

Similar Documents

Publication Publication Date Title
US3885149A (en) Lamp pinch seals
US3501662A (en) Planar or three-dimensional fluorescent lamp and method of manufacture
US4243907A (en) Lamp having reduced width press-seal
US3265923A (en) Baseless double-ended electric incandescent lamp
US3617797A (en) Pinch-base electric lamp with transversely arranged supply wires
US3810684A (en) Lamps
US4126810A (en) Ceramic base for glass halogen lamps
US5037342A (en) Method of making an electric lamp, and more particularly a lamp vessel in which electrodes are retained in the lamp by a pinch or press seal
US4469983A (en) Electric lamp with an envelope seal designed as pinch seal, and a device and method for its manufacture
US3080497A (en) Bent end incandescent lamp
US3211511A (en) Electric lamp manufacture
US2159794A (en) Electric lamp and similar devices
US2682009A (en) Seal and method of fabrication
US3270237A (en) Electric lamp with single ended pinch seal
US2845557A (en) Arc tube mounting
US4052638A (en) Flare-wedge lamp
US3271093A (en) Method for making incandescent lamps
US2816398A (en) Apparatus for manufacture of a quartzto-metal foil press seal
US3462209A (en) Method of making vacuum type electric incandescent lamps
US4806816A (en) High-pressure discharge lamp
US3475641A (en) Electric incandescent lamp and mount structure with leading-in wires having inturned offset inner ends
US3351802A (en) Single ended, quartz type incandescent lamp
JPH06283145A (ja) 両側を封着されたハロゲンランプ
US3301623A (en) Method of manufacturing double-ended electric lamps
ES307674A1 (es) Un metodo de hacer una estructura de montura para una lampara de incandescencia