US3717783A - Electric incandescent lamp comprising an internal fuse - Google Patents

Electric incandescent lamp comprising an internal fuse Download PDF

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Publication number
US3717783A
US3717783A US00012692A US3717783DA US3717783A US 3717783 A US3717783 A US 3717783A US 00012692 A US00012692 A US 00012692A US 3717783D A US3717783D A US 3717783DA US 3717783 A US3717783 A US 3717783A
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US
United States
Prior art keywords
lamp
pair
envelope
pinch seal
conductors
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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
US00012692A
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English (en)
Inventor
V Notelteirs
E Janssen
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US Philips Corp
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US Philips Corp
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Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3717783A publication Critical patent/US3717783A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/62—One or more circuit elements structurally associated with the lamp
    • H01K1/66—One or more circuit elements structurally associated with the lamp with built-in fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/40—Leading-in conductors

Definitions

  • the invention relates to an electric filament lamp, particularly a mono-pinch halogen filament lamp, which comprises a tubular lamp vessel in which metal foils having secured thereto current beams projecting from the lamp are sealed in a pinch seal to which foils a preferably coiled-coil filament which may consist of a few series-arranged parts is electrically connected.
  • a filament lamp is known as a mono-pinch halogen filament lamp for copying purposes.
  • a filament which is composed of a few series-arranged parts is incorporated with its two ends in the pinched seal and is secured to the foils which are sealed in said pinch seal.
  • the switched-on lamp fuses nearly always a discharge lamp is formed in which an arc is maintained which in the case of sufficient duration can cause the lamp seal and even the lamp housing connections to fuse and give rise to lamp explosions. It has been found that this is very hard to realize, particularly in mono-pinch halogen lamps since in these lamps the foils with the wire parts projecting in said lamp space are situated at a very short distance from one another. It is then desirable to have the disposal of an extremely rapidly reacting fuse.
  • said fuse is on the one hand unfit for incorporation in an electric filament lamp for example, a halogen filament lamp, in which the choice of the materials to be used is restricted.
  • the known fuses materials are'used which melt at a considerably lower temperature than that which occurs in forming monopinch seals at the end of the tube of, for example, quartz glass.
  • the known fuses do not use current conductors of mutually different diameters.
  • the two conductors are formed as wires extending parallel between the filament and the foil.
  • the conductor having the smaller diameter is wound helically around the other conductor, and the resulting mandrel is screwed in the filament over part of its length.
  • This embodiment has the additional advantage that this combination of conductors formed as a mandrel can particularly simply be screwed in one end of the filament so that a rigid connection with the filament is obtained.
  • halogen filament lamps which comprise a rather compact light source and in which an identical assembly of conductors serving as an internal fuse is present at either end of the filament.
  • FIG. 1 is a longitudinal cross-sectional view of a first embodiment of a mono-pinch halogen lamp for copying purposes
  • FIG. 2 shows on an enlarged scale the connection of the filament to the foil incorporated in the pinch seal of the lamp shown in FIG. 1,
  • FIG. 3 is a cross-sectional view analogous to that shown in FIG. 1 ofa lamp to a second embodiment
  • FIG. 4 is an enlarged cross-sectional view analogous to that shown in FIG. 2 of the connection of the filament to the foil incorporated in the pinch seal of the lamp shown in FIG. 3.
  • the I000 Watt halogen lamp shown in FIG. 1 which is operated at 225 Volts comprises a tubular lamp vessel l which is closed at one end by a flat pinch 3 and at the other end is closed by its sealed exhaust tube 5.
  • the lamp vessel is filled with a halogen-containing gas filling which will not be further described.
  • a filament composed of two series-arranged parts 7 and 9 is stretched in the lamp.
  • mandrels 13 and 15 are screwed which themselves are incorporated in a quartz glass beam 19 together with a supporting wire 17.
  • the supporting wire 17 is incorporated in the pinch seal 3 and comprises at its free end a location in which the part 8 between the filaments 7 and 9 is supported.
  • the mandrels l3 and 15 are each formed from a set of conductors 21, 23 and 25, 27, respectively. They are connected to the molybdenum foils 29 and 31.
  • the projecting beams 33 and 35 are secured to the foils 29 and 31 in any conventional manner.
  • the conductors formed as wires 21, 23 and 25, 27, respectively can serve as internal lamp fuses which prevent the switched-on lamp from exploding at the end of its life.
  • the two wires 21, 23 and 25, 27, respectively are of tungsten and have different diameters.
  • the wire 21 has a diameter of 150 p.
  • the wire 23 has a diameter of 100 a. Satisfactory fuse results have been found-possible when one wire is between 20 and percent thicker than the other wire.
  • FIG. 2 It is shown in detail in FIG. 2 how the two wires 21, 23 are secured to the filament.
  • the end of the filament 7 is denoted by four turns 37.
  • a mandrel is incorporated which is formed as a central rod 39 of tungsten having a wire 41, likewise of tungsten, helically wound thereon.
  • the resulting mandrel is directly screwed with its one end in the end of the filament 7 and may be provided with an auxiliary coil 43.
  • the assembly is incorporated in the above-mentioned quartz beam 19 which actually consists of two halves 45 and 47 which, after having been heated to melting, are forced together with the interposition of the end of the filament 7 having screwed therein the end of the mandrel 39, 41 described, and constitute a beam 19 after cooking.
  • the supporting wire 17 and the end of the other filament 9 are incorporated in the beam 19.
  • the beam 19 is hence spaced apart from the pinch seal 3.
  • the wire 21 provided with a few helically extending turns 49 is now screwed around the mandril while the wire 23 provided with analogous turns 51, is screwed around another part of the mandrel.
  • FIG. 3 'Ihe halogen filament lamp according to the embodiment shown in FIG. 3 is constructed in an analogous manner as the copying lamp shown in FIG 1.
  • this lamp also the two ends of the filaments 55 and 57 are incorporated in a quartz beam 53 and the foils 59 and 61 are connected to the ends of the filaments 55 and 57 by means of two wires 63, 65 and 67, 69.
  • said wires do not extend parallel to each other, but are formed as mandrels in which the conductor (63) having the smaller diameter (again 100 p.) is wound helically around the thicker conductor (150 u) constructed as a straight wire 65 (see FIG. 4).
  • the mandrel shown is again screwed in the end of the filament 55, if desirable with the interposition of an auxiliary coil 71.
  • An electric filament lamp comprising an evacuated tubular envelope having a pinch seal at one end, a
  • halogen atmosphere within said envelope a first pair of current conductors embedded within said pinch seal, two series arranged filaments stretched parallel to each other in a longitudinal direction within said envelope, and a supporting wire within said envelope and embedded in said pinch seal for supporting said filaments, each of said filaments being electrically coupled within said envelope to one of said first pair of current conductors through a second pair of parallel-connected conductors proximate to each pinch seal, one of said second pair of conductors having a cross-sectional area greater than the other of said second pair thereby providing a rapid acting internal fuse for said lamp, which fuse acts to prevent high current arcs from occurring at the end of lamp life and consequently prevents lamp explosion.
  • An electric filament lamp as claimed in claim 1 wherein said conductor having the smaller cross-sectional area is wound helically around the conductor having the greater cross-sectional area to form a mandrel that is screwed into said filaments over a part of its length.

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  • Resistance Heating (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US00012692A 1969-02-21 1970-02-19 Electric incandescent lamp comprising an internal fuse Expired - Lifetime US3717783A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6902806A NL6902806A (it) 1969-02-21 1969-02-21

Publications (1)

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US3717783A true US3717783A (en) 1973-02-20

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ID=19806231

Family Applications (1)

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US00012692A Expired - Lifetime US3717783A (en) 1969-02-21 1970-02-19 Electric incandescent lamp comprising an internal fuse

Country Status (5)

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US (1) US3717783A (it)
BE (1) BE746249A (it)
DE (1) DE2006208C3 (it)
GB (1) GB1235079A (it)
NL (1) NL6902806A (it)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6483232B1 (en) 2000-07-14 2002-11-19 Amglo Kemlite Laboratories, Inc. Aviation landing lamp
US20030127980A1 (en) * 2001-03-16 2003-07-10 Bernd Hofmann Halogen incandescent lamp
US6803706B2 (en) * 2001-03-06 2004-10-12 Koninklijke Philips Electronics N.V. Lamp with double layer coiled-coil filament
EP1670037A1 (de) * 2004-09-10 2006-06-14 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Glühlampe
WO2006137036A3 (en) * 2005-06-24 2007-08-09 Koninkl Philips Electronics Nv Halogen incandescent lamp and method for manufacturing such a lamp
US20100133981A1 (en) * 2008-12-02 2010-06-03 Ceferino Garcia Lamp for rapid temperature processing
DE202015002269U1 (de) 2014-03-31 2015-05-06 Osram Sylvania Inc. Lampensicherung in einem Pressdichtungshohlraum

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864025A (en) * 1953-08-24 1958-12-09 Gen Electric Infrared ray generating device
US3423622A (en) * 1966-07-05 1969-01-21 Sylvania Electric Prod Electrical filament support device
US3441772A (en) * 1967-05-12 1969-04-29 Gen Electric Filament mount structure for electric lamps and manufacture thereof
US3496403A (en) * 1968-03-28 1970-02-17 Westinghouse Electric Corp Single-ended electric incandescent lamp and mount assembly therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864025A (en) * 1953-08-24 1958-12-09 Gen Electric Infrared ray generating device
US3423622A (en) * 1966-07-05 1969-01-21 Sylvania Electric Prod Electrical filament support device
US3441772A (en) * 1967-05-12 1969-04-29 Gen Electric Filament mount structure for electric lamps and manufacture thereof
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
US6483232B1 (en) 2000-07-14 2002-11-19 Amglo Kemlite Laboratories, Inc. Aviation landing lamp
US6803706B2 (en) * 2001-03-06 2004-10-12 Koninklijke Philips Electronics N.V. Lamp with double layer coiled-coil filament
US20030127980A1 (en) * 2001-03-16 2003-07-10 Bernd Hofmann Halogen incandescent lamp
US6803721B2 (en) * 2001-03-16 2004-10-12 Koninklijke Philips Electronics N.V. Halogen incandescent lamp
EP1670037A1 (de) * 2004-09-10 2006-06-14 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Glühlampe
CN1747127B (zh) * 2004-09-10 2010-10-06 电灯专利信托有限公司 白炽灯
WO2006137036A3 (en) * 2005-06-24 2007-08-09 Koninkl Philips Electronics Nv Halogen incandescent lamp and method for manufacturing such a lamp
US20100207523A1 (en) * 2005-06-24 2010-08-19 Koninklijke Philips Electronics, N.V. Halogen incandescent lamp and method for manufacturing such a lamp
CN101203936B (zh) * 2005-06-24 2011-07-13 皇家飞利浦电子股份有限公司 卤素白炽灯及制造此种灯的方法
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
DE202015002269U1 (de) 2014-03-31 2015-05-06 Osram Sylvania Inc. Lampensicherung in einem Pressdichtungshohlraum

Also Published As

Publication number Publication date
NL6902806A (it) 1970-08-25
GB1235079A (en) 1971-06-09
DE2006208B2 (de) 1977-09-01
DE2006208A1 (de) 1970-09-03
BE746249A (it) 1970-08-19
DE2006208C3 (de) 1978-05-03

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