US3710169A - Halogen filament lamp having an internal all protection arrangement - Google Patents

Halogen filament lamp having an internal all protection arrangement Download PDF

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Publication number
US3710169A
US3710169A US00012693A US3710169DA US3710169A US 3710169 A US3710169 A US 3710169A US 00012693 A US00012693 A US 00012693A US 3710169D A US3710169D A US 3710169DA US 3710169 A US3710169 A US 3710169A
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US
United States
Prior art keywords
filament
rod
lamp
pinch seal
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
US00012693A
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English (en)
Inventor
Jampens G T
V Notelteirs
E Janssen
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.)
US Philips Corp
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US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3710169A publication Critical patent/US3710169A/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
    • H01K1/38—Seals for leading-in conductors
    • 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

Definitions

  • ABSTRACT A halogen filament lamp having two pinch seals in [30] Forei n Appli tion Pri it D m which at least one of the seals a rod is embedded. The rod, which is secured at one end to a sealing foil and Feb. 21, 7 Netherlands at t t etched p o vides an improved internal fuse for the lamp. [52] U.S. Cl. ..313/222, 313/317, 313/331 [51] Int.
  • the invention relates to an electric filament lamp, particularly a halogen filament lamp, which is formed as a lamp vessel closed by two pinch seals, such lamp has at least one of the ends of the coiled-coil filament stretched in said lamp vessel secured in one of the pinch seals to a rod which is partly inserted in the end.
  • the filament with its rod portion projecting from the end is secured to a foil incorporated in the pinch seal.
  • the foil is connected to a current conductor projecting from said pinch part outside the lamp.
  • a halogen filament lamp is known as a double-pinch lamp.
  • the filament lamp is constructed with a coiled-coil filament which is meant as a compact light source.
  • This type of electric filament lamp which has a high efficiency suitable inter alia for photographic purposes, comprises an internal protective arrangement to prevent the switched-on lamp from exploding at the end of the life of the lamp. More particularly, at the end of lamp life at which time the filament is interrupted a discharge lamp is actually formed in which an arc is maintained. The lamp then operates as an arc lamp with a current strength which is so large that the lamp seals and even the connections of the lamp housing can melt.
  • the present invention is based on the recognition of the fact that a protective operation can be obtained which is at least as effective as in the known halogen filament lamp, if that side of the pinch where the above-mentioned rod is already sealed in has a slightly different construction.
  • the invention is characterized in that the rod is entirely embedded in the pinch seal.
  • FIG. 1 shows a halogen filament lamp of the known type
  • FIG. 2 shows the halogen lamp according to the invention.
  • FIG. 1 shows a known halogen filament lamp which comprises a tubular envelope 1 of glass and which has flat pinch seals 3 and 5, respectively, at either end.
  • a so-called coiled coil filament 7 of tungsten wire is stretched out in said lamp which filament has a particularly short length and which extends axially in the tubular envelope 1.
  • the coiled coil filament 7 shown has a comparatively short length.
  • the halogen filament lamp shown comprises a molybdenum foil portion 9 and a tungsten or molybdenum rod 11 secured to said foil and formed as a mandril around which one of the ends of the coiled coil filament 7 is wound.
  • a rod may serve as a mandril which comprises a helical groove.
  • a rod is usually chosen around which a wire is helically wound.
  • the assembly can then be screwed in one end of the filament in such manner that a rigid connection is obtained.
  • a current conductor 13 is secured to the foil 9.
  • the foil 9, the rod 11 and the current conductor 13 are incorporated in the pinch seal 3 in the manner shown.
  • the other end of the coiled coil filament 7 is expanded and incorporated in the pinch seal 5 and secured at its end to the foil 15 to which finally the output conductor 17 is secured.
  • the end of the filament 7 facing the pinch seal 5 is constructed as a fuse within the envelope 1, by means of which fuse the lamp seals and the external circuit are protected from damage by strong currents in extraordinary circumstances occurring When the lamp filament is interrupted.
  • the lamp according to the invention shown in FIG. 2 in general has the same shape as that shown in FIG. 1.
  • a rod 19 is present which is surrounded at one end by a few turns of the filament 21 and is secured to the foil 23 incorporated in the pinch seal 25 with its end remote from said filament.
  • the whole rod 19 is embedded in the pinch seal 25 in such manner that there is some distance between the inner space 27 of the lamp.
  • the advantage of incorporating the rod 19 entirely in the pinch seal 25 is that, at the junction between the end of the rod 19 and the filament 21, the large temperature gradient which is present in the corresponding junction in the construction shown in FIG. 1 is hardly noticeable.
  • this rod is entirely incorporated in the pinch seal 25 in which an efficient heat dissipation takes place in the glass mass.
  • an internal lamp arc protection arrangement can be obtained by embedding the rod 19 entirely in the pinch seal. It has been found experimentally that the distance a for lamps operating above 24 volt should be at least 1 millimeter per centimeter of filament if it is to be an excellent arc protection arrangement the quality of which is at least comparable to that of the lamp shown in FIG. 1 in which the expanded part of the filament 7 incorporated in the other pinch seal serves as a fuse.
  • pinch seal 25 can likewise be applied to the other pinch seal 29 in which a beam 31 constructed as a mandril is also embedded entirely in the seal.
  • An electric filament lamp comprising an envelope having at least one pinch seal, anh'alogen atmosphere within said envelope, a current conductor including a metal foil portion embedded within said pinch seal, a
  • internal arc protection means comprising a rod entirely embedded within said pinch seal, said rod being independent of said conductor and filament, one end of said rod being connected to said metal foil portion of said current conductor and the other end being secured by means to an end of said coiled filament at a point within said pinch seal.
  • An electric filament lamp comprising an envelope having pinch seals at the ends, an halogen atmosphere within said envelope, current conductors including metal foil portions embedded within said pinch seals, a coiled coil filament within said envelope and internal arc protection means comprising rods entirely embedded within said pinch seals and spaced from the inner walls of the envelope containing said halogen atmosphere, the ends of said rods remote from said filament being connected to said metal foil portions of said current conductors and the other ends of said rods being secured by means to the ends of said filament at points within said pinch seals.
  • a halogen-type filament lamp of the type having at least one pinch seal, a coiled coil filament and current carrying means wherein the improvement comprises internal arc protection means including: a rod entirely embedded within said pinch seal, said rod being independent of said current carrying means and filament, one end of said rod being connected by means to said filament within said pinch seal, the other end of said rod being connected to said current carrying means.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
US00012693A 1969-02-21 1970-02-19 Halogen filament lamp having an internal all protection arrangement Expired - Lifetime US3710169A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6902805A NL6902805A (enrdf_load_stackoverflow) 1969-02-21 1969-02-21

Publications (1)

Publication Number Publication Date
US3710169A true US3710169A (en) 1973-01-09

Family

ID=19806230

Family Applications (1)

Application Number Title Priority Date Filing Date
US00012693A Expired - Lifetime US3710169A (en) 1969-02-21 1970-02-19 Halogen filament lamp having an internal all protection arrangement

Country Status (7)

Country Link
US (1) US3710169A (enrdf_load_stackoverflow)
JP (1) JPS5110036B1 (enrdf_load_stackoverflow)
BE (1) BE746248A (enrdf_load_stackoverflow)
DE (1) DE7004265U (enrdf_load_stackoverflow)
FR (1) FR2035651A5 (enrdf_load_stackoverflow)
GB (1) GB1294954A (enrdf_load_stackoverflow)
NL (1) NL6902805A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132922A (en) * 1977-10-13 1979-01-02 Westinghouse Electric Corp. Gas-filled incandescent lamp with integral fuse assembly
US4275329A (en) * 1978-12-29 1981-06-23 General Electric Company Electrode with overwind for miniature metal vapor lamp
US4550269A (en) * 1983-02-04 1985-10-29 The General Electric Company, P.L.C. Electric discharge lamps
US5205769A (en) * 1992-08-14 1993-04-27 Gte Products Corporation Method of making a lamp with an internally pressed fuse
US5345144A (en) * 1992-08-14 1994-09-06 Gte Products Corporation Lamp with internally pressed fuse
WO2008053400A3 (en) * 2006-10-30 2008-12-11 Koninkl Philips Electronics Nv Incandescent lamp
DE202015002269U1 (de) 2014-03-31 2015-05-06 Osram Sylvania Inc. Lampensicherung in einem Pressdichtungshohlraum

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448322A (en) * 1966-12-15 1969-06-03 Gen Electric Direct filament enclosed incandescent lamps and contact means therefor
US3470410A (en) * 1967-01-16 1969-09-30 Gen Electric Bromine regenerative cycle incandescent lamps with protective overwind coils on coiled filament legs

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448322A (en) * 1966-12-15 1969-06-03 Gen Electric Direct filament enclosed incandescent lamps and contact means therefor
US3470410A (en) * 1967-01-16 1969-09-30 Gen Electric Bromine regenerative cycle incandescent lamps with protective overwind coils on coiled filament legs

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132922A (en) * 1977-10-13 1979-01-02 Westinghouse Electric Corp. Gas-filled incandescent lamp with integral fuse assembly
US4275329A (en) * 1978-12-29 1981-06-23 General Electric Company Electrode with overwind for miniature metal vapor lamp
US4550269A (en) * 1983-02-04 1985-10-29 The General Electric Company, P.L.C. Electric discharge lamps
US5205769A (en) * 1992-08-14 1993-04-27 Gte Products Corporation Method of making a lamp with an internally pressed fuse
US5345144A (en) * 1992-08-14 1994-09-06 Gte Products Corporation Lamp with internally pressed fuse
WO2008053400A3 (en) * 2006-10-30 2008-12-11 Koninkl Philips Electronics Nv Incandescent lamp
DE202015002269U1 (de) 2014-03-31 2015-05-06 Osram Sylvania Inc. Lampensicherung in einem Pressdichtungshohlraum

Also Published As

Publication number Publication date
FR2035651A5 (enrdf_load_stackoverflow) 1970-12-18
JPS5110036B1 (enrdf_load_stackoverflow) 1976-04-01
GB1294954A (enrdf_load_stackoverflow) 1972-11-01
DE7004265U (de) 1970-07-30
NL6902805A (enrdf_load_stackoverflow) 1970-08-25
BE746248A (fr) 1970-08-19

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