CA1287892C - Hermetically sealed electrical feedthrough - Google Patents
Hermetically sealed electrical feedthroughInfo
- Publication number
- CA1287892C CA1287892C CA 544771 CA544771A CA1287892C CA 1287892 C CA1287892 C CA 1287892C CA 544771 CA544771 CA 544771 CA 544771 A CA544771 A CA 544771A CA 1287892 C CA1287892 C CA 1287892C
- Authority
- CA
- Canada
- Prior art keywords
- electrical conductor
- cylindrical cavity
- adapter
- conductor
- glass body
- 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
Abstract
ABSTRACT
An hermetically sealed electrical feedthrough assembly including an elongated inner electrical conductor having first and second ends; a glass body hermetically sealed around one length portion of the inner conductor adjacent to the first end thereof; a metal adapter hermetically sealed around the glass body and adapted for mounting in a wall of a housing; a tubular outer electrical conductor enclosing and coaxial with another length portion of the inner electrical conductor, the outer electrical conductor being separated from the inner electrical conductor by an annular volume and having one end portion electrically connected to the metal adapter and an opposite end portion disposed adjacent to the second end of the inner electrical conductor; and electrical insulation filling the annular volume. and electrically isolating the outer electrical conductor from the another length portion of the inner electrical conductor.
An hermetically sealed electrical feedthrough assembly including an elongated inner electrical conductor having first and second ends; a glass body hermetically sealed around one length portion of the inner conductor adjacent to the first end thereof; a metal adapter hermetically sealed around the glass body and adapted for mounting in a wall of a housing; a tubular outer electrical conductor enclosing and coaxial with another length portion of the inner electrical conductor, the outer electrical conductor being separated from the inner electrical conductor by an annular volume and having one end portion electrically connected to the metal adapter and an opposite end portion disposed adjacent to the second end of the inner electrical conductor; and electrical insulation filling the annular volume. and electrically isolating the outer electrical conductor from the another length portion of the inner electrical conductor.
Description
~ ~,3~8t~
EERMETICALLY SEALED ELECTRICAL ~EEDl~ROUGH
, , , , , , , ~ . , . . , , . . . . = . . . . .. , _ Thi~ invention xelates generally to ~lectrical feedthroughs and~
more particularly~ to an hermetically sealed coaxial ca~le ~eedthrou~h, Hermetlcally~sealed casings are used e~tensively to package a variety oE hybrid mlcrocircults, Typlcally7 glass-to-m~tal seal3 are employed to hermetically se~l and electrically isolate one or more lead wires from a packag~ body, Generally, the hermetlc seal is produced by f~sing glass bet~een th~ lead wire and the package body. Such hybrid packages provide~ for mlcroelectronic circuits~ enclosures that are electricàlly accessible but completely isolated from exter~al hostile environments, Si~niflcant problems encountered during the creation of ~ermetically sealed packages stem from requirements for internal circuitry rout~ng, The use. of either elongated pin feedthroughs or gold r~bbons to reach intern~l circuitry often results in impedance ~smatches, Conversely, the :-intercc,nnection of ~nternal circuitry and feedthrough pins with coax~al cable a~semblieq entails sensitlve solde~ing procedures that can da~ge i~dividual components, particularl~ the frag~le lnner conductors o~ th~
cable ~ emblies, The object o~ this invention~ there~ore? i~ to provide an lmproved fe~dthrough for hermetically sealed packages, The invention ls an hermetically ~ealed electrical feedthrough asgemhly including an elongated inner electrical conduc~or having first and sec~nd ends; a glas~ body hermetically sealed around one length portio~ of the inner conductor adjacent ~o the first end thereof; a metal adapter he~metica-ly sealed around the gl ss body and adapted for mounting ~n a ~all of a housing; a tubular outer electrical conductor enclosing and coaxial 3~ 3.~
~3~
with another length portion of the l~ner electrlcal conductor, the outer electrical conductor being separated from the inn~r slectrical conductor by an ann~lar yolume and having one end portion electricall~ connected to the metal adapter and an opposite end portion dispoRed ad~acent to the second end o~ the inner electrical conductor; and electrical insulation Pilling th~ annular volume and e~ectric~lly isolating the outer electrical conductor fro~ t~e a~othe~ length por~ion of the lnn~r çlectrical conductor, ~igh per~ormance interconnections with microcircuitry in an hermetically sealed }lousing is facili~ated by ~he di~closed asRembly.
According to speclfic features of the invention, the adapter defi~e~
an oute~ cylindrical cavity extending in~ardly rom an outer end thereof a~d an ~nner cylindrical cavity extending i~wardly from an inner end thereof a~d coa~cially aligned wi~h the outer cylindrical cavitya the outer cylindrlcal cavLty retaining the glass body~ and the inner cyllndrlcal cavity retai~ing an end section of the outer electrlcal conductor~ The~e featu~eli p~ovlde the de~ired assem~ly in a structurall~ eELicient arrangement.
I~ccording to another Pe~ture o~ the inventio~, the adapter daine~
a circw~erential Plange with an ann~lar surface for`engaging the wall o the ho~3ing~ t~e annular sur~ace faci~g taward the inner end, The circ~m~e~rential flange acc~mmodates mounting of the assembly in the hermetically sealed hou~ing, According to stlll other features o~ the invention~ the inner and outer cylindrical cavitIe~ are separa~ed by a central cavity de~ined by an a2~nular rib havlng an inner surface facing the inner cylindrical ca~ity and an outer surface fac~ng the outer cylindrical c~vity~ the inner surface en~ages the outer electrlcal conductor, the outer ~urface engages ~ald glas~
~od~, the dlame~er of the inner cylindrical cavity is less than the dlameter ~ the outcr cylind~ical cavityy ~nd the an~ther length portion of the in~ler electrical conductor extends between ~he second e~d t~ereof and the cen~ral cavity.
~r37~
Accordîng to yet other features of the invention~ the inner electrical conductor ~nd the adapter a~e made of 6tainless st~el and pla~ed with an alloy comprising nickel and gold, and the outer electrical condl-ctor is made of a ductile~ electrically conductive material. The disclo~ed canductor and adapter materlals facilitates both hermetic sealing and soldering operatlons while the ductile outer conductor i9 easily manipulated during lnterconnection procedures.
The lavention further includes a method for producing ~n hermetically sealed cable assembly and constituted by the steps of pxovid~ng a cylindrical glass body with an axial passage; providing a ~etal adapter with a cylindrlcal cavity confor~ing to the glass body; providing an elongated inner electrical conductor; providing an elongated? tubular outer electr~cal conductor having an inner surface engaged by an elongated cyl~ndrical insulator defining a ce~tral passage coaxially aligned with ~he outer electrical conductor and conformdng in shape to the inner electrical conductor; inserting one length portion of the inner electrical conduc~ lnto th~axial passage; inserting the glass body into the outer cylindrical cavity~
applying heat so as to produce a hermetic seal between the glass body and both the adapter and the one length porti~n of the inner electrical conductor; pre~sing another length portion of the inner electrical eonductor into the central pa~sage; and electrically connected the outer elactrical conductor to the ad~pterl This method provides the desired assembly in a si~ple~ efficient manner According to other method features of the invention, th~ adapt~r define~ an inner cylindrical cavity axially ~ligned ~ith the outer cylindrical cavity and a central cavity separating the inner and outer cy1indrlcal cavities and defined by a ridge h~ving an inner annular surface facing ~h~
f7 ~5~
inner cylindrical c~v-ity7 and the pre~sIng step comprises moving an end of the outer electrical conductor into the inner cavit~ an~ into engagement ~ith th~ inner a~nular surface. These steps si~pli~y productlon o~ the as~em~ly .
According to still other ~ethod features, the inner electrical conductor and ~he adapter are made of ~tainless steel ~nd are plated before the pressing atep, The use of plated sta~nless steel facil~ates both hermetic seal~ng and soldering of the inner conductor and adapter while performing the plating step before insertion o~ the outer conductor reduces platin~'costs and minlmizes the addition of undesira~le magnetlc properties ~o ~he 288embly~
The~e and other o~ects and features of the invention will beco~e more a~pparent upon a peru~al of the following des~rlptIon taken in çonJunction with tile accompanyi~g drawings wherein:
Pig. 1 is a right perspeetive vIew'of an hermetically sealed electrLcal feedthxough ass~m~ly according to t~e invention;
Fig. 2 is a left perspective view of t~e a sem~l~ shown In Tig, 13 ~ig. 3 is a s~ctio~al v~e~ taken along t~e l~ne~ 3-3 of Fig, 13 Fi~. 4 is a right end view of the'assem~l~ shown'in Fig. l; a~d Fig. 5 ia a left erld vi~w of the assem~ly ~hown in Fig. 1.
A p~eferred embodiment of ~:n electrical feedthrough assembly ll is illustrated 1~ Figs. 1~5. Included in the as~embly ll are a metal 'adapter 12 a~d a cylindrical gla~33 bod~ 13 and a coaxial ca~le 14 both retained thereby. The ad~ter 12 ha~ an outer cylindricaI portion 15 joi~ed ~o an inner cylindric~l por~ion 16 of reducPd diameter ~nd both a~ial~y all~ned ~l~h the coaxial cable 14. Projec'~ng outwardly fror~ the outer cylindrical portion 15 is a circumferential flange 17 that def-lnes an annular surface 18 facing to~ard the coaxial cable 14. Further defined by the outer c~lind~ical portion 15 is an outer cylindrical cavity 19 that retains and conforms ln shape to the glass body.l3~ which also i8 axially aligned with th~. ca~le 14, The glass bocly 13 is hermetirally sealed within the outer cylindrical cavi~y 19 of the adapter 12 and defines an axial ~assage 21.
Forming the coaxial cable 14 i5 an elongated inner elec.rical conductor 22 and an elonga~ed and coaxial, ~ubular outer eIectrical conduc~or 23 separated thererom by an annular space filled with an electrical insulation material 240 Cne length portion 25 of the inner conductor 22 - ad~acen~ to a first end 26.thereof i9 received by and herme~ically ~ealed in the axlal pas3age 21 of the glass body 13. Another length portio~ 28 of the ~nner conductor 22 between a second end 29 thereof and the one length portion 25 i9 received by a central passage 31 in the electrical insulation 24. Electrically connected to ~he adapter 12 by solder 32 i9 one end portion 33 of the outer conductor 23;wh~le an~oppo~te end portion 34.
terminat:es ad~acent to the second end 29 of the inner conductor 22 ~Ln inner cylindrlcal cavity 35 is formed in the reduced diameter ,~ inner portion 16 of the adapter 12. The inner cavity 35 i9 axially aligned ~i~h t~.ou~er cavity 10 and i9 separated therefrom by a central cavity 36 de~.~ned by an lnwardly directed annu~ar rib 37 pro~ectlng inwardly fram the outer portion 15 of the adapter 12. Defined by the annular rib 37 i3 an outer shoulder surface 38 angaged by the glass body 13 and an inner shoulder surface 39. An end section 41 of the one end portion 33 of th~
outer conductor 23 conforms in shape to and ls received by the inner cylindrical cavity 35. Engaging the inner shoulder surface 39 o~ the annular rib 37 is an end 42 o~ the end sectlon 41.
' ~ 37 ~
According to a preferred embodiment of t.he assembly 11? ~he adapter 12 and the Inner conductor 22 are made o stainless steel pl~ted with a nic~el? gold alloy~ the outer conduotor 23 i5 made of ductlle, electric~lly conductive material such as copper; and the electrical S insula~on 24 is a suitable dielectric. In ~ypical use, t~e outer por~ion 15 of ~he adapter ~2 i~ in~erted thxough an opening 44 in a ~lou~ing 4$
to p~oduce engagPment thereof with the annular sur~a~e 18 on the clrcumferentlaI flan&e 17, A hermetlc seal the~ 19 establ~hed between the housing 45 and the adapter 12 by solder 46 applied between the houaing 45 and the c~rcumf~rential flange 17. Th~ ~econd end 29 of the lnner conductor 22 and the opposite end portion 34 of th~ outer conductor 23.
: then are electrically connected to circuity Cnot ~hown~ to be hermetically sealed ~ithi~ the housing 45. A conventional female ~ocket connector then ca~ be coupled to the first end 26 of the inner conductor 22 90 as to : 15 provide fox the transmission of electrlcal si~nals through the wall~ o the housing 45, In accordance with a pre~erred method of conatruction for the ~ssembly 11, the length portion 25 of the inner conductor 22 is in~rted ~nto th~ axial pas~a~e 21 o~ the gla88 body 13 which the~ erted into th~ outer cyl~drical cavi ~ 19 of the adapter 12. Sequential heating a~d cooling produces non~uniform expansion of the glass body 13 relative to the 3tainle~s ateel in~er conductor ~2.~nd adapter 12 and resultant compr~ssion therebetween ~ & t creates an hermetic seal. After the sealing step, the exposed surfaces of the inner conductor 22 and the adapter 12 are plated ~ith a nickel, gold alloy. The gold in the plating fini~h enhances the electrical conductivity of the l~ner co~ductor 22 and the adapter 12 so as to reduce the RF insertion losse3 of the completed cable a~embly 11, while the nickel content both facilitate~ subsequent ~old~ring op~ratlon~ on the adapter 12 and functions as a barrier to prevent the ~ ~3~
migration of contaminants through the gold and nickel layer. ~lext, the previously combined outer conductor 23 and insulat~on 24 are assemhled as a composite body by pressing the length portion 28 of the inner conductor 22 into the central passage 31. During .th~s assemfily step, t~e end section 41 of the outer conductor~23 is inserted ~nto t~e Inner cylindrIcal ca~lty 35 of the ada~ter 12 until the end.42 of the outer conductor 23 engages the inner surface 3~ of the rib 37. FinallyJ t~e outer conductor 23 i~
~ecured to thQ adapter 12 by the app1icatlon of solder 32 t~erebetweeQ.
EERMETICALLY SEALED ELECTRICAL ~EEDl~ROUGH
, , , , , , , ~ . , . . , , . . . . = . . . . .. , _ Thi~ invention xelates generally to ~lectrical feedthroughs and~
more particularly~ to an hermetically sealed coaxial ca~le ~eedthrou~h, Hermetlcally~sealed casings are used e~tensively to package a variety oE hybrid mlcrocircults, Typlcally7 glass-to-m~tal seal3 are employed to hermetically se~l and electrically isolate one or more lead wires from a packag~ body, Generally, the hermetlc seal is produced by f~sing glass bet~een th~ lead wire and the package body. Such hybrid packages provide~ for mlcroelectronic circuits~ enclosures that are electricàlly accessible but completely isolated from exter~al hostile environments, Si~niflcant problems encountered during the creation of ~ermetically sealed packages stem from requirements for internal circuitry rout~ng, The use. of either elongated pin feedthroughs or gold r~bbons to reach intern~l circuitry often results in impedance ~smatches, Conversely, the :-intercc,nnection of ~nternal circuitry and feedthrough pins with coax~al cable a~semblieq entails sensitlve solde~ing procedures that can da~ge i~dividual components, particularl~ the frag~le lnner conductors o~ th~
cable ~ emblies, The object o~ this invention~ there~ore? i~ to provide an lmproved fe~dthrough for hermetically sealed packages, The invention ls an hermetically ~ealed electrical feedthrough asgemhly including an elongated inner electrical conduc~or having first and sec~nd ends; a glas~ body hermetically sealed around one length portio~ of the inner conductor adjacent ~o the first end thereof; a metal adapter he~metica-ly sealed around the gl ss body and adapted for mounting ~n a ~all of a housing; a tubular outer electrical conductor enclosing and coaxial 3~ 3.~
~3~
with another length portion of the l~ner electrlcal conductor, the outer electrical conductor being separated from the inn~r slectrical conductor by an ann~lar yolume and having one end portion electricall~ connected to the metal adapter and an opposite end portion dispoRed ad~acent to the second end o~ the inner electrical conductor; and electrical insulation Pilling th~ annular volume and e~ectric~lly isolating the outer electrical conductor fro~ t~e a~othe~ length por~ion of the lnn~r çlectrical conductor, ~igh per~ormance interconnections with microcircuitry in an hermetically sealed }lousing is facili~ated by ~he di~closed asRembly.
According to speclfic features of the invention, the adapter defi~e~
an oute~ cylindrical cavity extending in~ardly rom an outer end thereof a~d an ~nner cylindrical cavity extending i~wardly from an inner end thereof a~d coa~cially aligned wi~h the outer cylindrical cavitya the outer cylindrlcal cavLty retaining the glass body~ and the inner cyllndrlcal cavity retai~ing an end section of the outer electrlcal conductor~ The~e featu~eli p~ovlde the de~ired assem~ly in a structurall~ eELicient arrangement.
I~ccording to another Pe~ture o~ the inventio~, the adapter daine~
a circw~erential Plange with an ann~lar surface for`engaging the wall o the ho~3ing~ t~e annular sur~ace faci~g taward the inner end, The circ~m~e~rential flange acc~mmodates mounting of the assembly in the hermetically sealed hou~ing, According to stlll other features o~ the invention~ the inner and outer cylindrical cavitIe~ are separa~ed by a central cavity de~ined by an a2~nular rib havlng an inner surface facing the inner cylindrical ca~ity and an outer surface fac~ng the outer cylindrical c~vity~ the inner surface en~ages the outer electrlcal conductor, the outer ~urface engages ~ald glas~
~od~, the dlame~er of the inner cylindrical cavity is less than the dlameter ~ the outcr cylind~ical cavityy ~nd the an~ther length portion of the in~ler electrical conductor extends between ~he second e~d t~ereof and the cen~ral cavity.
~r37~
Accordîng to yet other features of the invention~ the inner electrical conductor ~nd the adapter a~e made of 6tainless st~el and pla~ed with an alloy comprising nickel and gold, and the outer electrical condl-ctor is made of a ductile~ electrically conductive material. The disclo~ed canductor and adapter materlals facilitates both hermetic sealing and soldering operatlons while the ductile outer conductor i9 easily manipulated during lnterconnection procedures.
The lavention further includes a method for producing ~n hermetically sealed cable assembly and constituted by the steps of pxovid~ng a cylindrical glass body with an axial passage; providing a ~etal adapter with a cylindrlcal cavity confor~ing to the glass body; providing an elongated inner electrical conductor; providing an elongated? tubular outer electr~cal conductor having an inner surface engaged by an elongated cyl~ndrical insulator defining a ce~tral passage coaxially aligned with ~he outer electrical conductor and conformdng in shape to the inner electrical conductor; inserting one length portion of the inner electrical conduc~ lnto th~axial passage; inserting the glass body into the outer cylindrical cavity~
applying heat so as to produce a hermetic seal between the glass body and both the adapter and the one length porti~n of the inner electrical conductor; pre~sing another length portion of the inner electrical eonductor into the central pa~sage; and electrically connected the outer elactrical conductor to the ad~pterl This method provides the desired assembly in a si~ple~ efficient manner According to other method features of the invention, th~ adapt~r define~ an inner cylindrical cavity axially ~ligned ~ith the outer cylindrical cavity and a central cavity separating the inner and outer cy1indrlcal cavities and defined by a ridge h~ving an inner annular surface facing ~h~
f7 ~5~
inner cylindrical c~v-ity7 and the pre~sIng step comprises moving an end of the outer electrical conductor into the inner cavit~ an~ into engagement ~ith th~ inner a~nular surface. These steps si~pli~y productlon o~ the as~em~ly .
According to still other ~ethod features, the inner electrical conductor and ~he adapter are made of ~tainless steel ~nd are plated before the pressing atep, The use of plated sta~nless steel facil~ates both hermetic seal~ng and soldering of the inner conductor and adapter while performing the plating step before insertion o~ the outer conductor reduces platin~'costs and minlmizes the addition of undesira~le magnetlc properties ~o ~he 288embly~
The~e and other o~ects and features of the invention will beco~e more a~pparent upon a peru~al of the following des~rlptIon taken in çonJunction with tile accompanyi~g drawings wherein:
Pig. 1 is a right perspeetive vIew'of an hermetically sealed electrLcal feedthxough ass~m~ly according to t~e invention;
Fig. 2 is a left perspective view of t~e a sem~l~ shown In Tig, 13 ~ig. 3 is a s~ctio~al v~e~ taken along t~e l~ne~ 3-3 of Fig, 13 Fi~. 4 is a right end view of the'assem~l~ shown'in Fig. l; a~d Fig. 5 ia a left erld vi~w of the assem~ly ~hown in Fig. 1.
A p~eferred embodiment of ~:n electrical feedthrough assembly ll is illustrated 1~ Figs. 1~5. Included in the as~embly ll are a metal 'adapter 12 a~d a cylindrical gla~33 bod~ 13 and a coaxial ca~le 14 both retained thereby. The ad~ter 12 ha~ an outer cylindricaI portion 15 joi~ed ~o an inner cylindric~l por~ion 16 of reducPd diameter ~nd both a~ial~y all~ned ~l~h the coaxial cable 14. Projec'~ng outwardly fror~ the outer cylindrical portion 15 is a circumferential flange 17 that def-lnes an annular surface 18 facing to~ard the coaxial cable 14. Further defined by the outer c~lind~ical portion 15 is an outer cylindrical cavity 19 that retains and conforms ln shape to the glass body.l3~ which also i8 axially aligned with th~. ca~le 14, The glass bocly 13 is hermetirally sealed within the outer cylindrical cavi~y 19 of the adapter 12 and defines an axial ~assage 21.
Forming the coaxial cable 14 i5 an elongated inner elec.rical conductor 22 and an elonga~ed and coaxial, ~ubular outer eIectrical conduc~or 23 separated thererom by an annular space filled with an electrical insulation material 240 Cne length portion 25 of the inner conductor 22 - ad~acen~ to a first end 26.thereof i9 received by and herme~ically ~ealed in the axlal pas3age 21 of the glass body 13. Another length portio~ 28 of the ~nner conductor 22 between a second end 29 thereof and the one length portion 25 i9 received by a central passage 31 in the electrical insulation 24. Electrically connected to ~he adapter 12 by solder 32 i9 one end portion 33 of the outer conductor 23;wh~le an~oppo~te end portion 34.
terminat:es ad~acent to the second end 29 of the inner conductor 22 ~Ln inner cylindrlcal cavity 35 is formed in the reduced diameter ,~ inner portion 16 of the adapter 12. The inner cavity 35 i9 axially aligned ~i~h t~.ou~er cavity 10 and i9 separated therefrom by a central cavity 36 de~.~ned by an lnwardly directed annu~ar rib 37 pro~ectlng inwardly fram the outer portion 15 of the adapter 12. Defined by the annular rib 37 i3 an outer shoulder surface 38 angaged by the glass body 13 and an inner shoulder surface 39. An end section 41 of the one end portion 33 of th~
outer conductor 23 conforms in shape to and ls received by the inner cylindrical cavity 35. Engaging the inner shoulder surface 39 o~ the annular rib 37 is an end 42 o~ the end sectlon 41.
' ~ 37 ~
According to a preferred embodiment of t.he assembly 11? ~he adapter 12 and the Inner conductor 22 are made o stainless steel pl~ted with a nic~el? gold alloy~ the outer conduotor 23 i5 made of ductlle, electric~lly conductive material such as copper; and the electrical S insula~on 24 is a suitable dielectric. In ~ypical use, t~e outer por~ion 15 of ~he adapter ~2 i~ in~erted thxough an opening 44 in a ~lou~ing 4$
to p~oduce engagPment thereof with the annular sur~a~e 18 on the clrcumferentlaI flan&e 17, A hermetlc seal the~ 19 establ~hed between the housing 45 and the adapter 12 by solder 46 applied between the houaing 45 and the c~rcumf~rential flange 17. Th~ ~econd end 29 of the lnner conductor 22 and the opposite end portion 34 of th~ outer conductor 23.
: then are electrically connected to circuity Cnot ~hown~ to be hermetically sealed ~ithi~ the housing 45. A conventional female ~ocket connector then ca~ be coupled to the first end 26 of the inner conductor 22 90 as to : 15 provide fox the transmission of electrlcal si~nals through the wall~ o the housing 45, In accordance with a pre~erred method of conatruction for the ~ssembly 11, the length portion 25 of the inner conductor 22 is in~rted ~nto th~ axial pas~a~e 21 o~ the gla88 body 13 which the~ erted into th~ outer cyl~drical cavi ~ 19 of the adapter 12. Sequential heating a~d cooling produces non~uniform expansion of the glass body 13 relative to the 3tainle~s ateel in~er conductor ~2.~nd adapter 12 and resultant compr~ssion therebetween ~ & t creates an hermetic seal. After the sealing step, the exposed surfaces of the inner conductor 22 and the adapter 12 are plated ~ith a nickel, gold alloy. The gold in the plating fini~h enhances the electrical conductivity of the l~ner co~ductor 22 and the adapter 12 so as to reduce the RF insertion losse3 of the completed cable a~embly 11, while the nickel content both facilitate~ subsequent ~old~ring op~ratlon~ on the adapter 12 and functions as a barrier to prevent the ~ ~3~
migration of contaminants through the gold and nickel layer. ~lext, the previously combined outer conductor 23 and insulat~on 24 are assemhled as a composite body by pressing the length portion 28 of the inner conductor 22 into the central passage 31. During .th~s assemfily step, t~e end section 41 of the outer conductor~23 is inserted ~nto t~e Inner cylindrIcal ca~lty 35 of the ada~ter 12 until the end.42 of the outer conductor 23 engages the inner surface 3~ of the rib 37. FinallyJ t~e outer conductor 23 i~
~ecured to thQ adapter 12 by the app1icatlon of solder 32 t~erebetweeQ.
Claims (10)
1. An hermetically sealed electrical feedthrough assembly comprising:
an elongated substantially non magnetic inner electrical conductor plated with a solderable material and having first and second ends;
a glass body hermetically sealed around one length portion of said inner conductor adjacent to said first end thereof;
a substantially nonmagnetic metal adapter plated with a solderable material and hermetically sealed around said glass body and adapted for mounting in a wall of a housing;
a tubular outer electrical conductor enclosing and coaxial with another length portion of said inner electrical conductor; said outer electrical conductor being separated from said inner electrical conductor by an annular volume and having one end portion electrically connected to said metal adapter and an opposite end portion disposed adjacent to said second end of said inner electrical conductor; and electrical insulation means filling said annular volume and electrically isolating said outer electrical conductor from said another length portion of said inner electrical conductor.
an elongated substantially non magnetic inner electrical conductor plated with a solderable material and having first and second ends;
a glass body hermetically sealed around one length portion of said inner conductor adjacent to said first end thereof;
a substantially nonmagnetic metal adapter plated with a solderable material and hermetically sealed around said glass body and adapted for mounting in a wall of a housing;
a tubular outer electrical conductor enclosing and coaxial with another length portion of said inner electrical conductor; said outer electrical conductor being separated from said inner electrical conductor by an annular volume and having one end portion electrically connected to said metal adapter and an opposite end portion disposed adjacent to said second end of said inner electrical conductor; and electrical insulation means filling said annular volume and electrically isolating said outer electrical conductor from said another length portion of said inner electrical conductor.
2. An assembly according to claim 1 wherein said adapter defines an outer cylindrical cavity extending inwardly from an outer end thereof ant an inner cylindrical cavity extending inwardly from an inner end thereof and coaxially aligned with said outer cylindrical cavity, said outer cylindrical cavity retaining said glass body, and said inner cylindrical cavity retaining an end section of said outer electrical conductor.
3. An assembly according to claim 2 wherein said inner and outer cylindrical cavities are separated by a central cavity defined by projection means having inner surface means facing said inner cylindrical cavity and outer surface means facing said outer cylindrical cavity and wherein said inner surface means engages said outer electrical conductor and said outer surface means engages said glass body,
4. An assembly according to claim 3 wherein said projection means comprise an annular rib having an inner surface facing said inner cylindrical cavity and an outer surface facing said outer cylindrical cavity, said inner surface engages said outer electrical conductors and said outer surface engages said glass body.
5. An assembly according to claim 4 wherein the diameter of said inner cylindrical cavity is less than the diameter of said outer cylindrical cavity.
6. An assembly according to claim 5 wherein said another length portion of said inner electrical conductor extends between said second end thereof and said central cavity.
7. An assembly according to claim 6 wherein said inner electrical conductor and said adapter are made of stainless steel and plated with an alloy comprising nickel and gold.
8. An assembly according to claim 7 wherein said outer electrical conductor is made of a ductile, electrically conductive material.
9. An assembly according to claim 1 wherein said adapter is one-piece and defines a circumferential flange with an annular surface for engaging the wall of the housing, said annular surface facing toward said inner end.
10. A method for producing an hermetically sealed electrical feedthrough assembly and comprising the following steps:
providing a cylindrical glass body with an axial passage;
providing a substantially non-magnetic metal adapter with an outer cylindrical cavity extending inwardly from an outer end thereof and conforming to said glass body;
providing an elongated substantially non-magnetic inner electrical conductor;
providing an elongated, tubular outer electrical conductor having an inner surface engaged by an elongated cylindrical insulator defining a central passage coaxially aligned with said outer electrical conductor and conforming in shape to said inner electrical conductor;
inserting one length portion of said inner electrical conductor into said axial passage;
inserting said glass body into said outer cylindrical cavity applying heat so as to produce a hermetic seal between said glass body and both said adapter and said one length portion of said inner electrical conductor, plating exposed portions of said adapter and said inner electrical.
conductor with a solderable material;
subsequently pressing another length portion of said inner electrical conductor into said central passage; and electrically connecting said outer electrical conductor to said adapter.
providing a cylindrical glass body with an axial passage;
providing a substantially non-magnetic metal adapter with an outer cylindrical cavity extending inwardly from an outer end thereof and conforming to said glass body;
providing an elongated substantially non-magnetic inner electrical conductor;
providing an elongated, tubular outer electrical conductor having an inner surface engaged by an elongated cylindrical insulator defining a central passage coaxially aligned with said outer electrical conductor and conforming in shape to said inner electrical conductor;
inserting one length portion of said inner electrical conductor into said axial passage;
inserting said glass body into said outer cylindrical cavity applying heat so as to produce a hermetic seal between said glass body and both said adapter and said one length portion of said inner electrical conductor, plating exposed portions of said adapter and said inner electrical.
conductor with a solderable material;
subsequently pressing another length portion of said inner electrical conductor into said central passage; and electrically connecting said outer electrical conductor to said adapter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/897,654 US4737601A (en) | 1986-08-18 | 1986-08-18 | Hermetically sealed electrical feedthrough and method of making same |
| US06/897,654 | 1986-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1287892C true CA1287892C (en) | 1991-08-20 |
Family
ID=25408201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 544771 Expired CA1287892C (en) | 1986-08-18 | 1987-08-18 | Hermetically sealed electrical feedthrough |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1287892C (en) |
| IL (1) | IL84256A (en) |
-
1987
- 1987-08-18 CA CA 544771 patent/CA1287892C/en not_active Expired
- 1987-10-23 IL IL8425687A patent/IL84256A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IL84256A (en) | 1992-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |