US3634722A - Tungsten halogen lamp having improved filament support - Google Patents

Tungsten halogen lamp having improved filament support Download PDF

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Publication number
US3634722A
US3634722A US23617A US3634722DA US3634722A US 3634722 A US3634722 A US 3634722A US 23617 A US23617 A US 23617A US 3634722D A US3634722D A US 3634722DA US 3634722 A US3634722 A US 3634722A
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United States
Prior art keywords
filament
lamp
envelope
support rod
bridges
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Expired - Lifetime
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US23617A
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English (en)
Inventor
Lewis H Paimer
Stephen F Kimball
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GTE Sylvania Inc
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Sylvania Electric Products Inc
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Publication date
Application filed by Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
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Publication of US3634722A publication Critical patent/US3634722A/en
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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
    • H01K1/24—Mounts for lamps with connections at opposite ends, e.g. for tubular lamp

Definitions

  • a tungsten halogen lamp has a coiled coil filament tensionally mounted and axially disposed within a fused silica tubular envelope.
  • a support rod extends substantially parallel to the filament for at least the entire length thereof.
  • the filament is supported at one or more points throughout its length by means of suitable arms connected to the support rod or by loops in the rod itself.
  • the ends of the support rod can be fixedly attached to rigid lamp members or one end may be slidably supported to permit longitudinal thermal expansion of the rod.
  • Coiled coil filaments came to be used in such lamps when the service requirements thereof dictated the use of heavier wire than could conveniently be used in simple coiled filaments.
  • the heavier wire coiled coil filaments permitted a heavier loading of the filaments in terms-of watts of electrical.
  • the supporting structures shown therein are satisfactory for some purposes, they are not suitable in some applications where, for example, it is desired that the filament comprise an integral length of wire or it is desired that no support wire be embedded in the residual exhaust tube tip. In the latter case, embedment of a wire in the exhaust tip usually necessitates that the tip be longer than it would be if no wire were embedded therein. Additionally, embedment of a wire therein could result in cracking of the fused tip if the diameter of the wire were not kept quite small.
  • a filament is supported by means of a support wire which has one end embedded in a press seal of the lamp and which has one unsupported end.
  • a support wire which has one end embedded in a press seal of the lamp and which has one unsupported end.
  • Such support wires can be satisfactory if they are not too long.
  • the unsupported end it is possible for the unsupported end to be transversely displaced if, say, the wire is quite long in relation to its diameter and the lamp has undergone rough handling. Displacement of the support wire could result in an undesirable displacement of the filament from its precise alignment within the lamp envelope and could, consequently, cause a local hot spot, with possible rupture, of the envelope.
  • This invention presents an improved filament mount that is capable of maintaining a filament in a substantially constant axial position throughout the life of the lamp.
  • a double-ended tungsten halogen lamp in accordance with this invention, comprises a coiled coil tungsten filament axially disposed within a fused silica transparent tubular envelope.
  • the envelope is hermetically sealed at each end by press seals within each of which is disposed a ribbon connector.
  • Internal lead-in wires connect each ribbon connector to a respective end of the filament.
  • External lead-in wires are connected to the ribbon connectors and extend out of the press seals in order to permit electrical connection to an external electrical power source.
  • a support rod extending beyond the ends of the filament is longitudinally disposed within the envelope between the filament and the envelope wall. substantially parallel to the filament.
  • the ends of the support rod are mounted in suitably rigid lamp members, such as a press seal or fused silica bridge. located at each end of the lamp.
  • the filament is supported at one or more points throughout its length by suitable engagement thereof to the support rod. Engagement may be made by suitable hooks or loops formed directly in the support rod or by separate arms attaching the filament to the support rod.
  • the support rod may be mounted so that each end thereof is fixedly. attached to the aforementioned rigid lamp members, such as by embedment within the press seal or silica bridge. However, one end of the support rod may be slidably mounted, such as in a rigidly positioned tubular element, in order to permit longitudinal thermal expansion of the rod.
  • FIG. I is a plan view of a lamp, in accordance with this invention, having a filament mount which includes silica bridges.
  • FIG. 2 shows an example of a lamp without silica bridges.
  • the lamp illustrated therein is of the regenerative cycletype containing a halogen such as bromine, iodine or chlorine or compounds thereof to maintain the bulb walls free of blackening for a long useful life.
  • the lamp comprises a fused silica tubular envelope I having at each end thereof an integral press seal 2.
  • a coiled coil tungsten filament 3 is axially disposed within envelope 1 and is connected at its respective ends to interior lead-in wires 4 having ends hermetically sealed in respective press seals 2 and connected to molybdenum ribbons 5 which are also hermetically sealed therein.
  • Exterior lead-in wires 6 are connected to respective ribbons 5 within press seals 2 and extend externally to provide means for connection to an electrical power source.
  • each lead-in wire 4 is bent into a shape that corresponds to about half of a secondary turn of filament 3.
  • Lead-in wires 4 are connected to respective ends of filament 3 by inserting the bent ends of lead-in wires 4 into the primary turns at each end of filament 3.
  • a secure connection is obtained by use of a lead-in wire 4 having a diameter about 1 mil less than the diameter of the primary mandrel on which filament 3 is coiled.
  • a fused silica rod or bridge 7 is transversely attached, such as by embedment, to each lead-in wire 4 at a point between each press seal 2 and the respective end of filament 3.
  • lead-in wire 4 may have a coil 8 tightly encircling it within the situs of embedment, in the manner shown in US. Pat. No. 3,466,489, issued on Sept. 9, 1969, to E. G. Audesse et al.
  • Support rod 9 is disposed between filament 3 and the bulb wall, substantially parallel to filament 3 for at least the body length thereof.
  • Support rod 9 comprises a halogen-resistant refractory metal, preferably tungsten, and is spaced closer to the bulb ball than to filament 3 in order to prevent heating of support rod 9 to an undesirably high temperature during lamp operation.
  • the ends of support rod 9 can be supported by embedment thereof in bridge 7, as shown at the left end of the lamp in FIG. 1, support rod 9 being bent beyond the filament body to bring it into register with bridge 7.
  • support rod 9 In cases where the position, length and operating temperature of support rod 9 is such that transverse deformation thereof could occur due to thermal elongation if both ends were rigidly fixed, one end, shown as the right end in FIG. I, can be slidably supported in a tubular element, such as coil 10. Upon thermal elongation of support rod 9, the left end remains rigidly fixed but the right end can slide within coil 10 to compensate for the elongation.
  • the relationship of coil 10 to support rod 9 is such that, while relative axial motion, i.e., elongation, is permitted therebetween, radial or transverse motion is substantially prevented. In one example where the diameter of support rod 9 was 35 mils, satisfactory results were obtained when coil 10 had an inside diameter of 40 mils.
  • Coil 10 was wound from a length of 8 mil tungsten wire at about I to l percent pitch and was partially embedded in bridge 7 in the manner previously described.
  • the pitch of coil 10 should not exceed about 150 or 200 percent in order to prevent excessive silica flow between the turns during embedment.
  • coil 10 comprises the slidable support of the specific embodiment shown, other slidable supports may be used with satisfactory results.
  • the slidable support may comprise a tube of refractory sheet metal that is rigidly supported or it may even comprise a hole through fused silica bridge 7.
  • filament 3 is supported at its center by means of arm 11 attached to support rod 9.
  • Arm ll comprised a length of mil tungsten wire formed into a coil at one end and a hook at the other end. The hook securely encircled a primary turn of filament 3 and the coiled end of arm 11 engaged support rod 9 by encirclement thereof.
  • support wires 12 at each end of the filament mount.
  • One end of each support wire 12 is embedded in respective bridge 7 and the other end, hook shaped, engages and supports respective points of filament 3.
  • a shallow groove may be formed in the embedded portions of the wires or the wires may have a small angular bend therein. Such grooves or bends aid in improving the mechanical bond between the fused silica and wire and in preventing rotation and loosening of the wire within the bridge.
  • filament 3 was formed by first primary coiling, then secondary coiling a long length of tungsten wire, and then cutting the coiling into lengths of 2.8 inches. Inserts 4, support wires 12 and support rod 9 with arm 11 thereon were then connected to filament 3 and, the assembly being mounted in a suitable positioning device, left bridge 7 was heated to the softening point and impressed on respective elements 12, 4 and 9. Right bridge 7 was similarly connected to respective elements 12 and 4 and coil 10. Filament 3 was then stretched sufficiently to permit insertion of the right end ofsupport rod 9 into coil 10.
  • An outer lead assembly comprising ribbon 5 and external lead-in wire 6 was then welded to each respective lead-in wire 4 and the filament mount was inserted into a %-inch diameter open-ended fused silica envelope 1. Press seals 2 were then formed in the envelope, the filament being stretched l or 2 mm. at the time of forming the second press seal in order to maintain the filament in tension and provide for expansion during operation. Envelope 1 was then exhausted, filled and sealed in the usual manner to complete the lamp. During normal operation, the electrical loading on the finished lamp was about 1,000 watts per inch of filament length.
  • FIG. 2 shown another embodiment of a lamp in accordance with this invention in which the ends of the support rod are embedded directly in the press seals.
  • the support rod therein comprises two separate elements, a long member 13 and a short member 14.
  • Long member 13 has one end embedded in right press seal 2 and extends substantially parallel to and beyond the body of filament 3 except for an intermediate portion 15 that bends around and supportingly engages a primary turn of filament 3 at about the center thereof.
  • Short member 14 has one end embedded in left press seal 2 and the other end formed into a coil, similar to coil 10 of FIG. 1.
  • Members 13 and 14 are substantially collinear, the innermost end of member 13 extending through and slightly beyond the coil of member 14.
  • the extensional portion of member 13 is shown bent at a right angle, the purpose of which is to prevent withdrawal thereof during assembly of the mount and manufacture of the lamp.
  • filament 3 may be supported at additional points throughout its length by the support rod.
  • the support rod may be looped or bent around filament 3, in the manner shown in FIG. 2, at several points thereof.
  • a tungsten halogen lamp comprising: an elongated fused silica envelop having press seals at each end thereof and a fill including a halogen; ribbon connectors hermetically sealed within said press seals; an elongated coiled-coil tungsten filament axially disposed and tensionally mounted within said envelope; internal lead-in wires connecting each end of said filament to a respective ribbon connector; external lead-in wires connected to said ribbon connectors; two silica bridges disposed within said envelope, one bridge near each end of said envelope, said bridges being supported by said respective internal lead-in wires; an elongated halogen-resistant means extending longitudinally within said envelope beyond both ends of said filament, said means supporting said filament and substantially preventing transverse displacement thereof, one end of said means being rigidly supported in one of said bridges and the other end of said means being slidably supported in the other of said bridges.
  • tubular member comprises a tungsten coil wound at between about to 200 percent pitch.

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US23617A 1970-03-30 1970-03-30 Tungsten halogen lamp having improved filament support Expired - Lifetime US3634722A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2361770A 1970-03-30 1970-03-30

Publications (1)

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JP (1) JPS549431B1 (https=)
GB (1) GB1325821A (https=)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50121582U (https=) * 1974-03-19 1975-10-03
US4070594A (en) * 1975-02-13 1978-01-24 Matsushita Electronics Corporation Light source device to be utilized mainly for projection purposes
US4359665A (en) * 1980-07-02 1982-11-16 Gte Products Corporation Filament support for tubular lamp
US4442374A (en) * 1982-03-25 1984-04-10 Gte Products Corporation Dual length copier lamp
US4540911A (en) * 1982-11-03 1985-09-10 Ushio Denki Kabushiki Kaisha Halogen lamp unit
US4551616A (en) * 1983-07-07 1985-11-05 Thorn Emi Domestic Appliances Limited Heating apparatus
EP0271858A3 (en) * 1986-12-16 1990-05-16 Gte Products Corporation High voltage hard glass halogen capsule
EP0271857A3 (en) * 1986-12-16 1990-05-16 Gte Products Corporation Compact coiled coil incandescent filament with supports
RU2201010C2 (ru) * 2001-04-11 2003-03-20 Открытое акционерное общество "Лисма" Галогенная лампа накаливания
US7012369B2 (en) * 2001-10-23 2006-03-14 Koninklijke Philips Electronics N.V. System for attaching a filament to a current lead-in
US20080050104A1 (en) * 2006-08-24 2008-02-28 Ushiodenki Kabushiki Kaisha Filament lamp and light-irradiation-type heat treatment device
US20080056693A1 (en) * 2006-08-29 2008-03-06 Star Progetti Tecnologie Applicate Spa Infrared heat irradiating device
US20080298787A1 (en) * 2007-05-29 2008-12-04 Ushiodenki Kabushiki Kaisha Filament lamp and light-irradiation-type heat treatment device
US20090231840A1 (en) * 2006-08-09 2009-09-17 Koninklijke Philips Electronics N.V. Recessed lighting fixture
US20100021147A1 (en) * 2008-07-28 2010-01-28 Ushio Denki Kabushiki Kaisha Filament lamp
US20140355971A1 (en) * 2013-05-30 2014-12-04 Osram Sylvania Inc. Infrared Heat Lamp Assembly
EP3043373A4 (en) * 2013-09-05 2017-04-26 Iwasaki Electric Co., Ltd Halogen lamp

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US686218A (en) * 1901-03-29 1901-11-05 Robert J Davis Incandescent electric lamp.
CA566022A (en) * 1958-11-11 H. Verbeek Leo Electric incandescent lamp filament support
NL6606244A (https=) * 1965-05-06 1966-11-07
US3335312A (en) * 1965-01-25 1967-08-08 Gen Electric Filament support for tubular incandescent lamps

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA566022A (en) * 1958-11-11 H. Verbeek Leo Electric incandescent lamp filament support
US686218A (en) * 1901-03-29 1901-11-05 Robert J Davis Incandescent electric lamp.
US3335312A (en) * 1965-01-25 1967-08-08 Gen Electric Filament support for tubular incandescent lamps
NL6606244A (https=) * 1965-05-06 1966-11-07

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50121582U (https=) * 1974-03-19 1975-10-03
US4070594A (en) * 1975-02-13 1978-01-24 Matsushita Electronics Corporation Light source device to be utilized mainly for projection purposes
US4359665A (en) * 1980-07-02 1982-11-16 Gte Products Corporation Filament support for tubular lamp
US4442374A (en) * 1982-03-25 1984-04-10 Gte Products Corporation Dual length copier lamp
US4540911A (en) * 1982-11-03 1985-09-10 Ushio Denki Kabushiki Kaisha Halogen lamp unit
US4551616A (en) * 1983-07-07 1985-11-05 Thorn Emi Domestic Appliances Limited Heating apparatus
EP0271858A3 (en) * 1986-12-16 1990-05-16 Gte Products Corporation High voltage hard glass halogen capsule
EP0271857A3 (en) * 1986-12-16 1990-05-16 Gte Products Corporation Compact coiled coil incandescent filament with supports
RU2201010C2 (ru) * 2001-04-11 2003-03-20 Открытое акционерное общество "Лисма" Галогенная лампа накаливания
US7012369B2 (en) * 2001-10-23 2006-03-14 Koninklijke Philips Electronics N.V. System for attaching a filament to a current lead-in
US20090231840A1 (en) * 2006-08-09 2009-09-17 Koninklijke Philips Electronics N.V. Recessed lighting fixture
US7874707B2 (en) * 2006-08-09 2011-01-25 Koninklijke Philips Electronics N.V. Recessed lighting fixture
US20080050104A1 (en) * 2006-08-24 2008-02-28 Ushiodenki Kabushiki Kaisha Filament lamp and light-irradiation-type heat treatment device
US7639930B2 (en) * 2006-08-24 2009-12-29 Ushiodenki Kabushiki Kaisha Filament lamp and light-irradiation-type heat treatment device
US7764871B2 (en) * 2006-08-29 2010-07-27 Star Progetti Tecnologie Applicate Infrared heat irradiating device
US20080056693A1 (en) * 2006-08-29 2008-03-06 Star Progetti Tecnologie Applicate Spa Infrared heat irradiating device
US20080298787A1 (en) * 2007-05-29 2008-12-04 Ushiodenki Kabushiki Kaisha Filament lamp and light-irradiation-type heat treatment device
US8014652B2 (en) * 2007-05-29 2011-09-06 Ushiodenki Kabushiki Kaisha Filament lamp and light-irradiation-type heat treatment device
US20100021147A1 (en) * 2008-07-28 2010-01-28 Ushio Denki Kabushiki Kaisha Filament lamp
US8488953B2 (en) * 2008-07-28 2013-07-16 Ushio Denki Kabushiki Kaisha Filament lamp
US20140355971A1 (en) * 2013-05-30 2014-12-04 Osram Sylvania Inc. Infrared Heat Lamp Assembly
US10264629B2 (en) * 2013-05-30 2019-04-16 Osram Sylvania Inc. Infrared heat lamp assembly
EP3043373A4 (en) * 2013-09-05 2017-04-26 Iwasaki Electric Co., Ltd Halogen lamp

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Publication number Publication date
JPS549431B1 (https=) 1979-04-24
GB1325821A (en) 1973-08-08

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