CA1245704A - Bridgeless tungsten halogen lamp - Google Patents
Bridgeless tungsten halogen lampInfo
- Publication number
- CA1245704A CA1245704A CA000486632A CA486632A CA1245704A CA 1245704 A CA1245704 A CA 1245704A CA 000486632 A CA000486632 A CA 000486632A CA 486632 A CA486632 A CA 486632A CA 1245704 A CA1245704 A CA 1245704A
- Authority
- CA
- Canada
- Prior art keywords
- envelope
- wire
- filament
- sealed
- coiled
- 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
Links
- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 16
- 239000010937 tungsten Substances 0.000 title claims abstract description 16
- 229910052736 halogen Inorganic materials 0.000 title claims abstract description 15
- -1 tungsten halogen Chemical class 0.000 title claims abstract description 8
- 150000002367 halogens Chemical class 0.000 claims abstract description 7
- 230000035939 shock Effects 0.000 claims abstract description 7
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 238000011109 contamination Methods 0.000 abstract description 5
- 239000011521 glass Substances 0.000 abstract description 5
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 abstract description 4
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052794 bromium Inorganic materials 0.000 abstract description 4
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 239000011261 inert gas Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000010453 quartz Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000011888 foil Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 2
- 240000002834 Paulownia tomentosa Species 0.000 description 2
- 235000010678 Paulownia tomentosa Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 241000405147 Hermes Species 0.000 description 1
- 241000282887 Suidae Species 0.000 description 1
- 240000004543 Vicia ervilia Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002226 simultaneous effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/18—Mountings or supports for the incandescent body
-
- 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
- H01K3/06—Attaching of incandescent bodies to mount
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Polyesters Or Polycarbonates (AREA)
- Resistance Heating (AREA)
Abstract
BRIDGELESS TUNGSTEN HALOGEN LAMP
ABSTRACT
A single-ended, tungsten halogen lamp having a tubular hard glass envelope containing an inert gas and a halogen, preferably bromine, therein. An improved bridgeless support structure is provided in which a wire support is attached to one end of a pair of filament coils. The wire support extends in two directions from the point of attachment and includes two extension portions which are each secured in the press-sealed base portion of the envelope to provide a fixed filament support with improved shock resistant capabilities and with reduced possibility of contamination due to elimination of the bridge element. A method of making the lamp is also described.
ABSTRACT
A single-ended, tungsten halogen lamp having a tubular hard glass envelope containing an inert gas and a halogen, preferably bromine, therein. An improved bridgeless support structure is provided in which a wire support is attached to one end of a pair of filament coils. The wire support extends in two directions from the point of attachment and includes two extension portions which are each secured in the press-sealed base portion of the envelope to provide a fixed filament support with improved shock resistant capabilities and with reduced possibility of contamination due to elimination of the bridge element. A method of making the lamp is also described.
Description
D-24,603 BRIDGELESS TUNGST~N HALOGEN LAMP
DESCRIPTION
TECHNICAL FI~L~D
The presen~ invention relate~ in gleneral to incande~cent lamps of the tung~ten ~alogen type and more particularly to an improvement in the filament suppo{t structure of such lamps.
BACKGROUND
In conventional tungsten ~alogen lamps, the parameters of the mount assembly are the limiting factor dictating the lamp dimensions which in turn control the performance characteristics of the lamp. Such characteri~tics include coil temperature, wattage and light distribution.
One example of a mounting s~ructure for u~e in conven~ional tungsten halogen lamp~ i~ de6cribed in Oetken et al., U.SO
Patent 4,415,833. A more 60phisticated mounting structure i~
6hown in U.S. Patent 4,450,381 to ~endric~ et al. Typically, such lamps employ an insulati~e bridge (quartz or glass) usually located below the filament 6tructure in which the lamp filament leads are embedded. The hridge secures the filament leadfi thereby supporting the filaments. In addition, the bridge serves to define the mount dimension~.
Most lamps of this ~ariety are of "si~gle-ended~
construction, in that only one end of t~e lamp is press-sealed about the lead-in filament wires and additional s~ructure, if any (e g., molybdenum foil elements). The remaining, opposed end is typically sealed using a known tipping operation.
D-24,603 Various bridge 6tructures are ~hown in the following patents~
U.S. 3,629,642 5Dema6) U.S. 3,736,456 (Middlehoek et al) U.S. 3,764,845 (DeFraeye) U.S. 3,780,333 (~lynn) The bridge under6tandably add~ to t~e C06t of the lamp structure, in addition to being a potenSial 60urce of contamina~ion. The added c06t re6ult6 from the labor and ~aterial requirea to produee the bridge as6embly and effect location of the filament 6tructure therein. The contamination i~ attributed to moisture or other impuritie~ entr,apped in the bridge which is driven out under the high tempera~ures encountered during lamp operation.
DISCLOSURE OF THE INVE~TION
In accordance with the invention, the lamp filament 6tructure is improved by eliminating the typical glass or quartz bridge. In place thereof, a wire support is provided which is attached to one end o~ the filament coil~). The wire ~upport extends in two direction~ from the point of attachment. Each extension ha6 suPficient length and flexibility to extend beyond the internal dimensions of the lamp envelope. Therefore, when initially as6embled in 6uch en~elope, the supports extensions mu~t be compressed and the lamp envelope slid over the compre6~ed wire 6upport attached to t~e filament~ or vice ver6a.
Once a~sembled in the la~p envelope. the lamp filament support s~ructure maintains i~8 as6embled po8ition wi~hin the envelope through friction between the interior wall of the envelope and the compressed wire. The lower portion of ~he D-24,603 ~457~4 lamp envelvpe is then pre~-sealed ~uch that the end~ of the wire support exten6ion6~ a6 well a~ the filament 6upport lead~, are embedded (e.g.O simultaneou~ly, u6ing known pre~sing eguipment) in the pre~6ed portion of the lamp envelope. This results in a fixed filament ~upport and an improved shock-re6i6tant lamp ~tructure with le~sened po66ibility for contaminati~n.
BRI~F DESCRIPTION OF THE DRAWINGS
FIG. 1 i~ a front elevation view, partly in ~ection, of a tung6ten halogen lamp according to a preferred embodiment of the present invention;
FIG. 2 is a partial sectional view of the embodiment of FIG. 1, on a slightly enlarged ~caled, in a partially disassembled 6tate 6howing the procedure for in~ertin~ the 6upport 6tructure into the lamp envelope FIG. 3 is a front elevation view, partly in 6ection, of a tungsten halogen lamp according to an alternate embodiment of the invention PIG. ~ is a front elevation view, partly in section, of a further embodiment of the invention FIG. 5 i6 a front elevation view, partly in 6ection, of a tungsten halogen lamp according to yet another embodiment of the inventio~; and FIG. 5A i~ a sectional view a6 taken along the lines A-A in FIG. 5 which for simplicity only show~ the curved portion6 of the filament support wire.
~-24 ~ 603 ~2~5~
BEST ~OD~ FOR CARRYI~G OUT THE INVENTION
For a better under6tanding of the ~pre~ent invention toget~er with other snd fur~her objectls, advantages, and capabilitie6 ~hereof, r2ference i6 ~adle to the following di~closure and appended clai~s in conn~ection with the above described drawings.
Before dicu66ing ~he detail~ of the improved ilament ~upport ~truc~ure of this invention, a di~cu6~ion follow~ of the main lamp components. In thi~ reg,ard, like reference character~ have been u~ed to identify like part6. Thu~, all embodiment6 of the lamp 10 compri6e a herme~ically ~ealed, light-tran~mitting envelope 12 of generally tubular (cylindrical) shape with a conventional (pres6-sealed~ ba6e portion 14. A pair of molybdenu~ foil ~eal6 16 dispo~ed within the ba~e ~erve to interconnect the input lead6 1~ to the filament body. A high melting polnt material, such as quartz, is typically u~ed for envelope 12, although other hard glas~e~
may also be employed. The hermetically sealed envelope 12 i6 usually filled with an inert ga~, such a6 2rgon~ nitrogen, krypton, or a mixture thereof, and~a halogen additive ~uch as iodine or bromine. In accordance with the pre6ent invention, the lamp envelope i6 preferably of the bromine fill type. The bromine fill may be provided in ~he form of a given mixture of hydrogen bromide.
Any one of a number of different types of filament bodies may be incorporated into the lamp. One ba~ic type of filament body i~ described in connection with the invention.
FIG. 1 show~ a tung~ten filament 24 which is referred to in the art as a CC2V (coiled coil) filament including two individual tung6ten filamen~ coil~ 26 and 28. The~e coil~ 26 and 28 are ~ecured to re~pective lead6 ~leg6) 27 and 29, re~pectively.
D-24,503 In ~he embodiment shown in FIG. 1, a filament ~upport structure comprises a wire 20 attached to the filament coils 26 and 2~ at tbe intersection 30 between the two CO116~ As shown, the filaments are ~eld by orming a 1O~DP 32 on wire Z0 with the inter~ecting por~ion 30 pas6ing therethrough. The base of the loop thus ~old~ ~he filaments at intersection 30. ~ire 20 is formed of ductile ma~erial compatible 1wit~ normal environment encountered in halogen lamp operation. Suitable ~aterials include tungsten and molybdenum.
The wire support structure 20 extends in two directions by wire extensions 40 and 42 outwardly from loop por~ion 32. The termination of each extension 40 and 42 is, as illu6trated, embedded wit~in the pressed portion 14 of lamp envelope 12 along ~ith the foil seal& 16 and input leads 18 during ~he conventional press sealing operatio~.
FIG. 2 shows a preferred method of assembling the support structure (shown generally at 60) into an open end of a length of glass tubing which eventually forms the lamp envelope 12 prior to exhausting and sealing thereof. As seen in F~G. 2, the extensions 40 and 42 of wire support 20, when not in compression, extend beyond (and are thus spaced farther apart than) the inner periphery of the envelope. Accordingly~ to insert the support s~ructure 60 within the envelope, the extensions must be compressed in the direction shown (by the arrows) as the envelope is slid over the support 6tructure 60.
The resultant friction between the wire extensions 40 and 42 and the internal surface~ of the envelope wall~ enables the support structure to maintain a proper position such that t~e filaments 26 and 24 are ~uitably located for optimum lamp illumina~ion. The aforedescribed inserti~n occurs to the extent ~hat both the filament support struc~ure and filament are located a predetermined distance within the glass tubing.
By predetermined i~ meant a distance such that the ~ubsequent ~s~
D-24,603 press-sealing of the tubing's open end will include encapsulation ~containment) of the extreme ends of extensions 40 and 42 therein, in addition to the ends of the leads 27 and 29. Understandably, this four-point retantion a~ this location assures posi~ive securemen~ of the filament in the de~ired position. The final step in this process involves tipping the opposing (upper in FIG. 2) end of the ~ubing using a tipping operation well known in the art.
Variations o~ the securing loop 32 shown in FIG. 1 are envisioned in accordance with the invention, with FIGS. 3-5 showing various embodiments of such loops. Each of these alternative e~bodiments comprises a lamp support structure 60 within a lamp envelope 12 having a pressed base portion 1~ and having a pair of molybdenum foil seals 16 respectively affixed to filament leads 27 and 29, which in turn form part of or are connected to f ilament coils 26 and 28, respectively. In addition, both filament coils are interconnected by the described intersection portion 30.
Referring to FIG. 3, 6upport wire 20' is similar to support wire 20 of FIG. 1 in that the filament is held or supported by the base of the loop 32'. However, the loop 32' in this embodiment is rotated 180 upwardly (towards the tubulated end of the lamp envelope) to allow the loop to extend into and thus be securedly retained within the tubulated dome portion 70 of the lamp envelope 12. Thi~ extension provides an additional point of filament support and therefore added shock or vibration resistance. Dome portion 70 is formed as a result of the aforementioned, known tipping procedure.
FIG. 4 shows an oval shaped loop structure with a lower portion 32" which holds the filaments at the in~ersection 30 but includes an upper portion 33 shaped to f it into the tubulated dome 33 for additional shock resistance. This embodiment thus combines both the advantageous f eatures of the embodimen~s of FIGS. 1 and 2.
D-24,603 ~ Z 45~ ~ 4 I~ ~IGS. 5 and 5A, the loop 32 i~ sub6tantially the same a~
that ~hown in PIGS. 1 and 2. However, the portion~ ~80) of wire 20 adjacen~ the loop are formed into 6ubstantially ~emicircular (arcuate) shapes which each conform (and engage~
to the inner peripheral surface of the lamp envelope (as shown more clearly in FIG. 5A). This enables more lamp envelope internal wall surface to be used for filament po~itioning and retention for shock resis~ance.
Comparative test~ between the bridgeless mount construction ~hown in the embodiment of FIG. 1 with respect to prior art quartz bridge mount assemblies were conducted. The results showed ~hat the quartz bridge lamp samples operated an average of about 808 hours before failing, whereas the bridgeless lamps operated for more than about 850 hours with no failure6. In addition, many of the quartz bridge lamps ex~ibited excessive crystal g~owth, thereby indicating contamination. It is believed that this contamination was caused by the guartz bridge used in the lamp construction. On the other hand, the bridgeless 6amples, ~hich were processed alony with the bridged samples, indicated no such contamination.
Having described a limited number of embodiments of the present invention, it should now be apparent to those skilled in the art that numersus other embodiments are contemplated as falling within the scope of this invention. Accordingly, this invention should not be limited except as reguired by the scope of the following claims.
DESCRIPTION
TECHNICAL FI~L~D
The presen~ invention relate~ in gleneral to incande~cent lamps of the tung~ten ~alogen type and more particularly to an improvement in the filament suppo{t structure of such lamps.
BACKGROUND
In conventional tungsten ~alogen lamps, the parameters of the mount assembly are the limiting factor dictating the lamp dimensions which in turn control the performance characteristics of the lamp. Such characteri~tics include coil temperature, wattage and light distribution.
One example of a mounting s~ructure for u~e in conven~ional tungsten halogen lamp~ i~ de6cribed in Oetken et al., U.SO
Patent 4,415,833. A more 60phisticated mounting structure i~
6hown in U.S. Patent 4,450,381 to ~endric~ et al. Typically, such lamps employ an insulati~e bridge (quartz or glass) usually located below the filament 6tructure in which the lamp filament leads are embedded. The hridge secures the filament leadfi thereby supporting the filaments. In addition, the bridge serves to define the mount dimension~.
Most lamps of this ~ariety are of "si~gle-ended~
construction, in that only one end of t~e lamp is press-sealed about the lead-in filament wires and additional s~ructure, if any (e g., molybdenum foil elements). The remaining, opposed end is typically sealed using a known tipping operation.
D-24,603 Various bridge 6tructures are ~hown in the following patents~
U.S. 3,629,642 5Dema6) U.S. 3,736,456 (Middlehoek et al) U.S. 3,764,845 (DeFraeye) U.S. 3,780,333 (~lynn) The bridge under6tandably add~ to t~e C06t of the lamp structure, in addition to being a potenSial 60urce of contamina~ion. The added c06t re6ult6 from the labor and ~aterial requirea to produee the bridge as6embly and effect location of the filament 6tructure therein. The contamination i~ attributed to moisture or other impuritie~ entr,apped in the bridge which is driven out under the high tempera~ures encountered during lamp operation.
DISCLOSURE OF THE INVE~TION
In accordance with the invention, the lamp filament 6tructure is improved by eliminating the typical glass or quartz bridge. In place thereof, a wire support is provided which is attached to one end o~ the filament coil~). The wire ~upport extends in two direction~ from the point of attachment. Each extension ha6 suPficient length and flexibility to extend beyond the internal dimensions of the lamp envelope. Therefore, when initially as6embled in 6uch en~elope, the supports extensions mu~t be compressed and the lamp envelope slid over the compre6~ed wire 6upport attached to t~e filament~ or vice ver6a.
Once a~sembled in the la~p envelope. the lamp filament support s~ructure maintains i~8 as6embled po8ition wi~hin the envelope through friction between the interior wall of the envelope and the compressed wire. The lower portion of ~he D-24,603 ~457~4 lamp envelvpe is then pre~-sealed ~uch that the end~ of the wire support exten6ion6~ a6 well a~ the filament 6upport lead~, are embedded (e.g.O simultaneou~ly, u6ing known pre~sing eguipment) in the pre~6ed portion of the lamp envelope. This results in a fixed filament ~upport and an improved shock-re6i6tant lamp ~tructure with le~sened po66ibility for contaminati~n.
BRI~F DESCRIPTION OF THE DRAWINGS
FIG. 1 i~ a front elevation view, partly in ~ection, of a tung6ten halogen lamp according to a preferred embodiment of the present invention;
FIG. 2 is a partial sectional view of the embodiment of FIG. 1, on a slightly enlarged ~caled, in a partially disassembled 6tate 6howing the procedure for in~ertin~ the 6upport 6tructure into the lamp envelope FIG. 3 is a front elevation view, partly in 6ection, of a tungsten halogen lamp according to an alternate embodiment of the invention PIG. ~ is a front elevation view, partly in section, of a further embodiment of the invention FIG. 5 i6 a front elevation view, partly in 6ection, of a tungsten halogen lamp according to yet another embodiment of the inventio~; and FIG. 5A i~ a sectional view a6 taken along the lines A-A in FIG. 5 which for simplicity only show~ the curved portion6 of the filament support wire.
~-24 ~ 603 ~2~5~
BEST ~OD~ FOR CARRYI~G OUT THE INVENTION
For a better under6tanding of the ~pre~ent invention toget~er with other snd fur~her objectls, advantages, and capabilitie6 ~hereof, r2ference i6 ~adle to the following di~closure and appended clai~s in conn~ection with the above described drawings.
Before dicu66ing ~he detail~ of the improved ilament ~upport ~truc~ure of this invention, a di~cu6~ion follow~ of the main lamp components. In thi~ reg,ard, like reference character~ have been u~ed to identify like part6. Thu~, all embodiment6 of the lamp 10 compri6e a herme~ically ~ealed, light-tran~mitting envelope 12 of generally tubular (cylindrical) shape with a conventional (pres6-sealed~ ba6e portion 14. A pair of molybdenu~ foil ~eal6 16 dispo~ed within the ba~e ~erve to interconnect the input lead6 1~ to the filament body. A high melting polnt material, such as quartz, is typically u~ed for envelope 12, although other hard glas~e~
may also be employed. The hermetically sealed envelope 12 i6 usually filled with an inert ga~, such a6 2rgon~ nitrogen, krypton, or a mixture thereof, and~a halogen additive ~uch as iodine or bromine. In accordance with the pre6ent invention, the lamp envelope i6 preferably of the bromine fill type. The bromine fill may be provided in ~he form of a given mixture of hydrogen bromide.
Any one of a number of different types of filament bodies may be incorporated into the lamp. One ba~ic type of filament body i~ described in connection with the invention.
FIG. 1 show~ a tung~ten filament 24 which is referred to in the art as a CC2V (coiled coil) filament including two individual tung6ten filamen~ coil~ 26 and 28. The~e coil~ 26 and 28 are ~ecured to re~pective lead6 ~leg6) 27 and 29, re~pectively.
D-24,503 In ~he embodiment shown in FIG. 1, a filament ~upport structure comprises a wire 20 attached to the filament coils 26 and 2~ at tbe intersection 30 between the two CO116~ As shown, the filaments are ~eld by orming a 1O~DP 32 on wire Z0 with the inter~ecting por~ion 30 pas6ing therethrough. The base of the loop thus ~old~ ~he filaments at intersection 30. ~ire 20 is formed of ductile ma~erial compatible 1wit~ normal environment encountered in halogen lamp operation. Suitable ~aterials include tungsten and molybdenum.
The wire support structure 20 extends in two directions by wire extensions 40 and 42 outwardly from loop por~ion 32. The termination of each extension 40 and 42 is, as illu6trated, embedded wit~in the pressed portion 14 of lamp envelope 12 along ~ith the foil seal& 16 and input leads 18 during ~he conventional press sealing operatio~.
FIG. 2 shows a preferred method of assembling the support structure (shown generally at 60) into an open end of a length of glass tubing which eventually forms the lamp envelope 12 prior to exhausting and sealing thereof. As seen in F~G. 2, the extensions 40 and 42 of wire support 20, when not in compression, extend beyond (and are thus spaced farther apart than) the inner periphery of the envelope. Accordingly~ to insert the support s~ructure 60 within the envelope, the extensions must be compressed in the direction shown (by the arrows) as the envelope is slid over the support 6tructure 60.
The resultant friction between the wire extensions 40 and 42 and the internal surface~ of the envelope wall~ enables the support structure to maintain a proper position such that t~e filaments 26 and 24 are ~uitably located for optimum lamp illumina~ion. The aforedescribed inserti~n occurs to the extent ~hat both the filament support struc~ure and filament are located a predetermined distance within the glass tubing.
By predetermined i~ meant a distance such that the ~ubsequent ~s~
D-24,603 press-sealing of the tubing's open end will include encapsulation ~containment) of the extreme ends of extensions 40 and 42 therein, in addition to the ends of the leads 27 and 29. Understandably, this four-point retantion a~ this location assures posi~ive securemen~ of the filament in the de~ired position. The final step in this process involves tipping the opposing (upper in FIG. 2) end of the ~ubing using a tipping operation well known in the art.
Variations o~ the securing loop 32 shown in FIG. 1 are envisioned in accordance with the invention, with FIGS. 3-5 showing various embodiments of such loops. Each of these alternative e~bodiments comprises a lamp support structure 60 within a lamp envelope 12 having a pressed base portion 1~ and having a pair of molybdenum foil seals 16 respectively affixed to filament leads 27 and 29, which in turn form part of or are connected to f ilament coils 26 and 28, respectively. In addition, both filament coils are interconnected by the described intersection portion 30.
Referring to FIG. 3, 6upport wire 20' is similar to support wire 20 of FIG. 1 in that the filament is held or supported by the base of the loop 32'. However, the loop 32' in this embodiment is rotated 180 upwardly (towards the tubulated end of the lamp envelope) to allow the loop to extend into and thus be securedly retained within the tubulated dome portion 70 of the lamp envelope 12. Thi~ extension provides an additional point of filament support and therefore added shock or vibration resistance. Dome portion 70 is formed as a result of the aforementioned, known tipping procedure.
FIG. 4 shows an oval shaped loop structure with a lower portion 32" which holds the filaments at the in~ersection 30 but includes an upper portion 33 shaped to f it into the tubulated dome 33 for additional shock resistance. This embodiment thus combines both the advantageous f eatures of the embodimen~s of FIGS. 1 and 2.
D-24,603 ~ Z 45~ ~ 4 I~ ~IGS. 5 and 5A, the loop 32 i~ sub6tantially the same a~
that ~hown in PIGS. 1 and 2. However, the portion~ ~80) of wire 20 adjacen~ the loop are formed into 6ubstantially ~emicircular (arcuate) shapes which each conform (and engage~
to the inner peripheral surface of the lamp envelope (as shown more clearly in FIG. 5A). This enables more lamp envelope internal wall surface to be used for filament po~itioning and retention for shock resis~ance.
Comparative test~ between the bridgeless mount construction ~hown in the embodiment of FIG. 1 with respect to prior art quartz bridge mount assemblies were conducted. The results showed ~hat the quartz bridge lamp samples operated an average of about 808 hours before failing, whereas the bridgeless lamps operated for more than about 850 hours with no failure6. In addition, many of the quartz bridge lamps ex~ibited excessive crystal g~owth, thereby indicating contamination. It is believed that this contamination was caused by the guartz bridge used in the lamp construction. On the other hand, the bridgeless 6amples, ~hich were processed alony with the bridged samples, indicated no such contamination.
Having described a limited number of embodiments of the present invention, it should now be apparent to those skilled in the art that numersus other embodiments are contemplated as falling within the scope of this invention. Accordingly, this invention should not be limited except as reguired by the scope of the following claims.
Claims (5)
1. In a tungsten halogen lamp including a hermetically-sealed, light-transmitting envelope having a press-sealed first end portion and a domed second end portion, an inert fill and halogen disposed within said envelope, a pair of coiled tungsten filaments spacedly oriented within said envelope and coupled together at one end thereof by an intersecting wire portion, and first and second filament lead wires, each of said lead wires having one end thereof positioned within said press-sealed portion of said envelope and a second end thereof secured to an opposing end of a respective one of said coiled tungsten filaments from said end coupled to said intersecting wire portion, the improvement comprising:
a filament support wire positioned substantially within said envelope and including a loop portion and a pair of wire extensions from said loop portion, each of said wire extensions compressed within said envelope and positioned within said press-sealed end portion of said envelope, said loop portion extending into and being securedly retained within said dome portion of said envelope and having said intersecting wire portion coupling said coiled filaments pass therethrough to thereby provide both support for said coiled filaments and resistance to shock and/or vibration.
a filament support wire positioned substantially within said envelope and including a loop portion and a pair of wire extensions from said loop portion, each of said wire extensions compressed within said envelope and positioned within said press-sealed end portion of said envelope, said loop portion extending into and being securedly retained within said dome portion of said envelope and having said intersecting wire portion coupling said coiled filaments pass therethrough to thereby provide both support for said coiled filaments and resistance to shock and/or vibration.
2. The improvement According to Claim 1 wherein the material of said filament support wire is ductile and is selected from the group consisting of tungsten and molybdenum.
3. The improvement according to Claim 1 wherein said loop portion of said filament support wire includes an upper looped portion and a lower looped portion, said intersecting wire portion passing through said lower looped portion with only said upper looped portion extending within said dome portion of said envelope to thereby provide added resistance to shock for said coiled filaments.
4. In a tungsten halogen lamp including a hermetically-sealed, light-transmitting envelope having a press-sealed first end portion and a domed second end portion, an inert fill and halogen disposed within said envelope, a pair of coiled tungsten filaments spacedly oriented within said envelope and coupled together at one end thereof by all intersecting wire portion, and first and second filament lead wires, each of said lead wires having one end thereof positioned within said press-sealed portion of said envelope and a second end thereof secured to an opposing end of a respective one of said coiled tungsten filaments from said end coupled to said intersecting wire portion, the improvement comprising:
a filament support wire positioned substantially within said envelope and including a loop portion and a pair of wire extensions from said loop portion, each of said wire extensions compressed within said envelope and positioned within said press-sealed end portion of said envelope, the portions of said wire extension adjacent said loop portion being of substantially semicircular configuration and engaging the inner surface of said envelope, said loop portion having said intersecting wire portion coupling said coiled filaments pass therethrough to thereby provide both support for said coiled filaments and resistance to shock and/or vibration.
a filament support wire positioned substantially within said envelope and including a loop portion and a pair of wire extensions from said loop portion, each of said wire extensions compressed within said envelope and positioned within said press-sealed end portion of said envelope, the portions of said wire extension adjacent said loop portion being of substantially semicircular configuration and engaging the inner surface of said envelope, said loop portion having said intersecting wire portion coupling said coiled filaments pass therethrough to thereby provide both support for said coiled filaments and resistance to shock and/or vibration.
5. The improvement according to Claim 4 wherein the material of said filament support wire is ductile and is selected from the group consisting of tungsten and molybdenum.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64728784A | 1984-09-04 | 1984-09-04 | |
| US06/647,287 | 1984-09-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1245704A true CA1245704A (en) | 1988-11-29 |
Family
ID=24596352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000486632A Expired CA1245704A (en) | 1984-09-04 | 1985-07-10 | Bridgeless tungsten halogen lamp |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0173995A3 (en) |
| JP (1) | JPS6166357A (en) |
| CA (1) | CA1245704A (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5158709A (en) * | 1990-02-01 | 1992-10-27 | Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh | Electric lamp containing molybdenum material doped wtih aluminum and potassium, molybdenum material for such a lamp, and method of its manufacture |
| US5367220A (en) * | 1990-03-15 | 1994-11-22 | Patent-Treuhand-Gesellschaft fur Elektrische Gluhiampen mbH | Electric lamp with a holding frame for a lamp filament |
| DE4106851A1 (en) * | 1990-03-15 | 1991-09-26 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Single-ended pinched halogen lamp operated from mains |
| ATE131313T1 (en) * | 1990-03-15 | 1995-12-15 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | SINGLE-SIDED CRUSHED HALOGEN BULB. |
| US5146134A (en) * | 1990-03-15 | 1992-09-08 | Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen M.B.H. | Halogen incandescent lamp, particularly for operation from power networks, and method of its manufacture |
| DE4008367A1 (en) | 1990-03-15 | 1991-09-26 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | ONE-SIDED CRUSHED HALOGEN BULB |
| US5659222A (en) * | 1996-02-27 | 1997-08-19 | Illumination Technology, Inc. | Vacuum sealed incandescent lamp with improved filament support structure |
| DE29612757U1 (en) * | 1996-07-24 | 1997-11-20 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 81543 München | Electric light bulb closed on one side |
| US7391146B2 (en) | 2002-12-20 | 2008-06-24 | Koninklijke Philips Electronics N.V. | Halogen incandescent lamp |
| DE102006014643A1 (en) * | 2006-03-29 | 2007-10-04 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Halogen incandescent lamp for medium or high voltage range, comprises holding unit, which is held by centre part in holding section of pump rod tip and it is provided with free end sections for holding luminous body |
| DE202009009008U1 (en) * | 2009-06-30 | 2009-09-10 | Osram Gesellschaft mit beschränkter Haftung | halogen bulb |
| CN104616970A (en) * | 2015-01-06 | 2015-05-13 | 浙江新光阳照明股份有限公司 | Two-step filament hanging method in production of single-ended halogen tungsten lamp |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1381868A (en) * | 1963-02-07 | 1964-12-14 | Lampes Sa | Improvements to electric lamps |
| US3403280A (en) * | 1966-03-04 | 1968-09-24 | Gen Electric | Single-ended electric incandescent lamp filament support |
| GB1168604A (en) * | 1967-05-25 | 1969-10-29 | Westinghouse Electric Corp | Electric Lamp with Improved Light Source Mount. |
| US4208608A (en) * | 1978-03-13 | 1980-06-17 | General Electric Company | Lamp mount structure |
| US4415833A (en) * | 1981-09-29 | 1983-11-15 | Gte Products Corporation | Tungsten halogen lamp with coiled getter |
-
1985
- 1985-07-10 CA CA000486632A patent/CA1245704A/en not_active Expired
- 1985-09-02 EP EP85111055A patent/EP0173995A3/en not_active Withdrawn
- 1985-09-03 JP JP19328785A patent/JPS6166357A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0173995A2 (en) | 1986-03-12 |
| EP0173995A3 (en) | 1988-10-12 |
| JPS6166357A (en) | 1986-04-05 |
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