US3600053A - Single-ended filament lamps - Google Patents

Single-ended filament lamps Download PDF

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Publication number
US3600053A
US3600053A US888719A US3600053DA US3600053A US 3600053 A US3600053 A US 3600053A US 888719 A US888719 A US 888719A US 3600053D A US3600053D A US 3600053DA US 3600053 A US3600053 A US 3600053A
Authority
US
United States
Prior art keywords
envelope
wire
support
filament
exhaust tube
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
US888719A
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English (en)
Inventor
Victor Mark Smith
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.)
Thorn Lighting Ltd
Original Assignee
Thorn Lighting 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 Thorn Lighting Ltd filed Critical Thorn Lighting Ltd
Application granted granted Critical
Publication of US3600053A publication Critical patent/US3600053A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/18—Mountings or supports for the incandescent body

Definitions

  • the present invention relates to single-ended tungsten halogen lamps.
  • Compact tungsten halogen lamps operating on mains voltage have presented considerable problems in construction. This is particularly so in the case of lamps which are single ended, i.e. both electrical conductors emerge from the lamp at one end. This is because a mains voltage lamp of necessity has a long filament made from comparatively fine wire as compared to a lamp operating on lower voltage where the wire is heavier and shorter. This means that the filament may have to be coiled coil. Such a filament in, say a 240v. 650v. lamp, is prone to arcing if not supported correctly.
  • the supporting can a be achieved in a number of ways, for example, by the use of a quartz bridge within the lamp from which supporting wires are hooked into the filament or by the use of a third electrode sealed into the pinch or press seal to which is welded a supporting wire which runs parallel to the filament. All these methods are not only costly, but introduceadditional wires and hardware into the lamp which will increase the tendency to arc causing early failure of the lamp.
  • a single-ended tungsten halogen lamp wherein the filament has two sections each supported at one end through a press seal and at the other end by a common electrically conductive support embedded in a tip in the wall of the lamp envelope and serving to convey current between the two filament sections.
  • the filament may be a single coil or a coiled coil.
  • the support may be a separate piece of wire to whose ends the filament sections are attached or may be formed by the uncoiled portion of a gapped filament whose coiled portions form the two filament sections.
  • each filament section from a press seal is entirely conventional and may be effected by embedding the filament end itself or a lead wire on which the filament end is mounted in the'press.
  • the filament leads can be attached in conventional manner to molybdenum foils embedded in the press which convey the current to the filament while maintaining a secure seal.
  • the support for the other ends of the filament sections is preferably a length of tungsten wire whose ends are inserted in the primary coil of two coiled coil filament sections and whose center is embedded in the tip in the wall of the envelope.
  • the support is embedded in a tip formed by sealing-off an exhaust tube.
  • the new lamp construction facilitates manufacture since the support can be carried by a wire extending through the exhaust tube and, with the filament leads held by a clamp, this wire serves to hold the filament sections in the correct position with the required coil pitch .while the press seal is formed and the exhaust tube is subsequently sealed-off. Using a short length of thin noble metal wire, such as platinum wire, attached to a stiffer wire to carry the support the wire can be melted through as the exhaust tube is sealed off.
  • FIG. 1 is a view in elevation of a single-ended coiled coil filament lamp in accordance with the invention.
  • FIG. 2 is a cross section illustrating a stage in the manufacture of the lamp of FIG. 1.
  • the tungsten halogen lamp shown has a quartz envelope with a press seal 11 which is mounted in a ceramic cap 12 having contact pins 13 to which the leads emerging from the press seal are connected.
  • Within the envelope 10 are two coiled-coil tungsten filament sections 14 and 15 extending parallel to one another and each having one end embedded in the press seal 11. At their other ends the filament sections 14 and 15 are carried by a common support 16 embedded in a tip 17.
  • the support 16 is a length of tungsten wire of wish-bone formation whose ends are inserted in the primary coils of the filament sections 14 and 15.
  • FIG. 2 shows how the lamp of FIG. 1 is manufactured.
  • filament assembly id first constructed which consists of the two filament sections 14 and 15 with respective inner leads 18 and 19, molybdenum foils 20 and 21, and outer leads 22 and 23, and of the common support wire 16.
  • a short length of thin platinum wire 24 is welded or hooked to the support wire 16 and a length of stiffer wire 25 for example nickel wire is attached to the platinum wire 24.
  • the whole assembly is inserted in the envelope 10 with the wires 24 and 25 extending through an exhaust tube 26.
  • the outer leads 22 and 23 are clamped in a vice and the wires 24 and 25 through the support 16, hold the filament sections 14 and 15 in the required position, maintaining correct tension in the secondary coils of the filament sections.
  • the press seal 11 is then formed, bringing the assembly to the condition shown in FIG. 2.
  • an inert atmosphere is maintained in the envelope 10 to prevent oxidation.
  • This is subsequently evacuated through the exhaust tube 26 and replaced by the required lamp filling gas, including a halogen.
  • the exhaust tube is then heated in the region around the bight of the support wire'l6, causing the quartz to melt and reform around the wire 16.
  • the heating burner is then applied to the part of the exhaust tube 26 around the platinum wire 24 causing the tube to collapse and melting through the platinum wire.
  • the tip 17 is formed which hermetically seals the lamp envelope 10 and serves to hold the support 16.
  • the filament sections are thereby held firmly in position with very little additional structure within the lamp and the danger of arcing between the secondary coils of the filament is considerably reduced.
  • the form of the support 16 which serves the dual function of providing mechanical support for the filament sections and connecting them electrically, can be varied considerably.
  • the nature of the wire used to carry the support 16 during assembly can be changed and in particular the platinum can be replaced by other noble metals.
  • a method of manufacturing a single-ended tungsten halogen lamp including a halogen-containing envelope, a press seal closing one end of the envelope, two filament sections within the envelope, each having one end separately supported in the press seal and a common electrically conductive support connecting the other ends of the filament sections, the steps which comprise: attaching one end of a noble metal wire to the common support; attaching a stiffer wire to the other end of the noble wire; inserting the wires through an exhaust tube of the envelope, one end of the stiffer wire protruding beyond the exhaust tube; holding the filament sections in tension while the press seal is formed; melting the exhaust tube adjacent the envelope to reform it around the common support; and heating the exhaust tube around the noble wire to melt the noble wire and seal the exhaust tube.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Resistance Heating (AREA)
US888719A 1969-02-13 1969-12-29 Single-ended filament lamps Expired - Lifetime US3600053A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7959/69A GB1219056A (en) 1969-02-13 1969-02-13 Single-ended filament lamps

Publications (1)

Publication Number Publication Date
US3600053A true US3600053A (en) 1971-08-17

Family

ID=9843067

Family Applications (1)

Application Number Title Priority Date Filing Date
US888719A Expired - Lifetime US3600053A (en) 1969-02-13 1969-12-29 Single-ended filament lamps

Country Status (7)

Country Link
US (1) US3600053A (enrdf_load_stackoverflow)
JP (1) JPS4812598B1 (enrdf_load_stackoverflow)
DE (1) DE2003884B2 (enrdf_load_stackoverflow)
FR (1) FR2031128A5 (enrdf_load_stackoverflow)
GB (1) GB1219056A (enrdf_load_stackoverflow)
NL (2) NL7001553A (enrdf_load_stackoverflow)
SE (1) SE364805B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743375A (en) * 1970-04-04 1973-07-03 Philips Corp Halogen filament lamp
US5270609A (en) * 1991-12-11 1993-12-14 U.S. Philips Corporation Incandescent lamp having improved filament support structure
WO2008116493A1 (de) * 2007-03-23 2008-10-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Glühlampe mit ummanteltem ende der glühwendel
USD580562S1 (en) * 2007-03-02 2008-11-11 Panasonic Corporation Filament for lamp
US20100133981A1 (en) * 2008-12-02 2010-06-03 Ceferino Garcia Lamp for rapid temperature processing
US8823252B1 (en) 2013-06-17 2014-09-02 Ford Global Technologies, Llc Incandescent lamp having bent filament terminal ends

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US247227A (en) * 1881-09-20 Electric lamp
FR1527882A (fr) * 1966-03-16 1968-06-07 Philips Nv Lampe à incandescence
US3496403A (en) * 1968-03-28 1970-02-17 Westinghouse Electric Corp Single-ended electric incandescent lamp and mount assembly therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US247227A (en) * 1881-09-20 Electric lamp
FR1527882A (fr) * 1966-03-16 1968-06-07 Philips Nv Lampe à incandescence
US3496403A (en) * 1968-03-28 1970-02-17 Westinghouse Electric Corp Single-ended electric incandescent lamp and mount assembly therefor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743375A (en) * 1970-04-04 1973-07-03 Philips Corp Halogen filament lamp
US5270609A (en) * 1991-12-11 1993-12-14 U.S. Philips Corporation Incandescent lamp having improved filament support structure
US5380230A (en) * 1991-12-11 1995-01-10 Philips Electronics North America Corporation Method of manufacturing a single-ended incandescent lamp
USD580562S1 (en) * 2007-03-02 2008-11-11 Panasonic Corporation Filament for lamp
USD586929S1 (en) 2007-03-02 2009-02-17 Panasonic Corporation Filament for lamp
USD588287S1 (en) 2007-03-02 2009-03-10 Panasonic Corporation Filament for lamp
USD595433S1 (en) 2007-03-02 2009-06-30 Panasonic Corporation Filament for lamp
USD595432S1 (en) 2007-03-02 2009-06-30 Panasonic Corporation Filament for lamp
WO2008116493A1 (de) * 2007-03-23 2008-10-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Glühlampe mit ummanteltem ende der glühwendel
US20100133981A1 (en) * 2008-12-02 2010-06-03 Ceferino Garcia Lamp for rapid temperature processing
US7932665B2 (en) * 2008-12-02 2011-04-26 Osram Sylvania Inc. Dual filament lamp for rapid temperature processing
US8823252B1 (en) 2013-06-17 2014-09-02 Ford Global Technologies, Llc Incandescent lamp having bent filament terminal ends

Also Published As

Publication number Publication date
JPS4812598B1 (enrdf_load_stackoverflow) 1973-04-21
SE364805B (enrdf_load_stackoverflow) 1974-03-04
DE2003884B2 (de) 1971-09-09
NL7001553A (enrdf_load_stackoverflow) 1970-08-17
NL137556C (enrdf_load_stackoverflow)
FR2031128A5 (enrdf_load_stackoverflow) 1970-11-13
DE2003884A1 (de) 1971-02-04
GB1219056A (en) 1971-01-13

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