US2510171A - Filament mount for high-power tubes - Google Patents
Filament mount for high-power tubes Download PDFInfo
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- US2510171A US2510171A US28984A US2898448A US2510171A US 2510171 A US2510171 A US 2510171A US 28984 A US28984 A US 28984A US 2898448 A US2898448 A US 2898448A US 2510171 A US2510171 A US 2510171A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/15—Cathodes heated directly by an electric current
- H01J1/18—Supports; Vibration-damping arrangements
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- This invention relates to high power electron tubes, and more especially it relates to thermionic filament units or mounts for such tubes.
- a principal object of the invention is to provide a more efiicient thermionic filament mount for high power electron tubes.
- Another object isto provide an improved multisection filament and mount for high power tubes, wherein filament bowing is reduced to a minimum.
- Another object is to provide a filament mount of the basket type, wherein the filament strips or sections are mounted so as to preserve their proper spaced relation with respect to an associated grid, while permitting each strip or section to elongate without bowing.
- Another object is to provide a filament mount of the basket type,,wherein the efiects of end cooling are reduced to a
- a feature of the invention relates to an improved high power thermionic filament mount, wherein the filament strips are supported in parallel longitudinal array and equi-distant around a common .center for cooperation with a surrounding grid.
- Another feature relates to an improved high power thermionic filament mount, wherein the filament strips are supported in radialand substantially planar array with respect to a common center for cooperation with a corresponding planar grid.
- Another feature relates to an improved thermionic filament and mount which is particularly useful in high power ultra-high-frequency tubes, wherein the electron transit time between the filament and control grid must be accurately determined with respect to the operating frequency of. the tube.
- An example of such a tube is the so-called Resnatron, as disclosed for example in U. S. Patent No. 2,405,763.
- a still further feature relates to the novel organization, arrangement and relative location of parts which cooperate to provide an improved filament mount for high power electron tubes, particularly those of the ultra-high-frequency type.
- Fig. l is a generalized view, partly perspective and partly sectional, of a filament mount embodying certain features of the invention.
- Fig. 2 is a vertical sectional view of one filament mount structure according to the invention.
- Fig. 3 is a top plan view of Fig. 2.
- Fig. 4 is a bottom plan view of Fig. 2.
- Fig. 5 is a vertical sectional view of a modified. filament mount according to the invention.
- Fig. 6 is a top plan View of Fig. 5.
- Fig. 7 shows the general method of supporting the mount of Figs. 2 and 3 within a tube envelope or housing.
- Fig. 8 shows the general arrangement for supporting the filament mount of Fig. 5 Within an evacuated tube or housing.
- the factor of electron transit time between the cathode and control grid is of great importance.
- the useful emission which reaches the anode is dependent upon a space charge layer adjacent the cathode which is of sufiicient thinness so as not materially to increase the transit time of an electron in its trajectory between the cathode and the control grid.
- the filament in order to achieve the best results with that type of tube, not only must'the filament be capable of supplying large quantities of electrons, but it must also preserve a uniform space relation with respect to the adjacent grid, even at the very high temperatures at which the filament operates- Furthermore, it is highly important that the temperature at each point of the filament strip be as uniform as possible. Because of the necessity of providing relatively massive anchoring rings or supports for the multi-strip filament, the problem of end cooling is of much greater importance in ultra-high-frequency power tubes than it is in conventional tubes to be used at relatively low frequencies. The filament supports for such ultra-high-frequency high power tubes must therefore perform three separate functions.
- the filament in the filament mount according to the invention, consists of a series of linear parallel strips arranged in a circular array around a common center so as to cooperate with an adjacent grid.
- Fig. 1 Such an arrangement is shown in generalized form in Fig. 1, comprising a thin-walled metal, tube 1, for example of nickel, which at its lower 7 end is welded or otherwise rigidly vfastenedto a: copper ring 2.
- the upper end of tube I is bent at right angles to form the desired .numberof integral and radially extending'lugs 3."
- Welded 1 to the ends of lugs 3 are respective tabs 4 of a refractory metal such as tantalum.
- the filamentstrip's are arranged" to, be heated by. connectingthe terminals of a suitable currentsupply respectively to rings 2 and'Sf Byproperdsign o'f'the dimensions and materials for the various elements asidescribed, no substantial end cooling?" of the filament strips takes place.
- the mount isprop- 0 er ly, designed, .if the filament .strips are removed andthe two endsofthe'iriountare joined together, the hot?"'end.f.of. the'niount would just reach" fila'mentl operating. temperature at' the above integral either numerically or by using a polynomial approximation: for the three functions. In this way by a series of trials one can find a combination of cross-section and length which gives the desired temperature drop.
- While .Fig. 1-.. shows the thin-walled tubular member I having one end bent over at right anglesto forma series of separate radially ex- 'tenol in gglugs this is' not necessary.
- the thinewalled ,tubularmember I may be provided with a continuous right-angled flange, and the tabs-4*can-"be-radially attached to this flange at appropriate; circumferentially spaced points.
- FIGs. 2 to 4 there is shown one actual construction or mount which has been fdund to possess the desired characteristics. It comprises ail'ow'er, ring 9"" of copper or other" metal of good"heatfcorrductivity.' Fitted “into-a” recessrin the; upper internal face"of"ring”9*is”a thin-walled 'nickeltubeil ll'fwhichimaybe'welded” to ringj. The upperjendoftubel Wisfbent out wardly to forma .rig'ht aIIgledfiangeI I.
- T1 isthe-"temperature of" the hot end and -T thatof the cold end:
- ring 28 and concentric therewith is'another nickel :ring 29 of thin-walled metal stock.
- ring 29 of thin-walled metal stock.
- a series of tantalum tabs 30 Suitably'attached, for example by welding, to the vertical rim of ring 28, are a series of tantalum tabs 30.
- is welded or otherwise fastened to the vertical rim of ring 29 , the tabs 39 and 3
- the filament strips 32 are each in the form of a tungsten strip having the ends bent downwardly at right angles and welded or otherwise fastened to the ends of the corresponding tabs 39, 3
- a tungsten strip having the ends bent downwardly at right angles and welded or otherwise fastened to the ends of the corresponding tabs 39, 3
- the rings 28 and 29 can be connected to suitable current supply terminals, it being understood that the rings 28 and 29 are supported in fixed coaxial relation in any well-known manner.
- the ring 28 is adapted to be fastened to a tubular. member 36
- radially discrete filament support tabs carried bythe rim of one of said members, a corresponding plurality of radially discrete filament support tabs carried by the rim of the other of said members, the tabs on said members being in aligned pairs, and a plurality of filament strands each strand being anchored at its opposite ends to a corresponding aligned pair of said tabs, each of said thin-walled metal tubular members having a predetermined electrical resistance to develop a predetermined localized amount of heat adjacent the filament ends attached thereto in response to the filament current flowing therethrough to maintain the said filament ends at substantially the same temperature as the remaining portions of the filament.
- each of said tabs is an integral extension of the rim of the corresponding one of said members
- each of said strands has a main portion extending parallel to the common axis of said coaxial members, and a pair of laterally extending portions which are respectively anchored to said annular members around the periphery thereof.
- each of said strands has a main portion extending radially outward from the common center of said coaxial members, and a pair having a predetermined electrical resistance to ;chored respectively to said coaxial members around the periphery thereof.
- a multi-strand filament mount for electron tubes comprising, a pair of coaxial annular filament anchoring members. each in the form of thin-walled metal tubular stock having its rim bent at substantially right angles, a ring of highly conductive metal for each member and to which .it is :rigidly fastened while permitting said rim to flex with respect to thering, a plurality of radially discrete filament support tabs carried by the rim of one of said members, a corresponding plurality of ,radially discrete filament support tabs carried by the rim of the other of said .members, the .tabs on said members being ar- .to a corresponding aligned pair of tabs, each of said thin-Walled metal tubular members having a predetermined electrical resistance to develop a predetermined localized amount of heat adjacent the filament ends attached thereto in response to the filament current flowing therethrough to maintain the said filament ends at substantiallythe same temperature as the remaining portions of the filament.
- AfiIament mount according to claim 4 in which each of said rings is rigid in a radial direction.
- a multi-strand filament mount for electron tubes comprising, a pair of spaced coaxial annular filament anchoring members each of thinwalled tubular metal stock, a plurality of radially discrete filament anchoring lugs radially extending from the rim of one of said members, a correto each lug, and a filament strand fastened at its opposite ends to a corresponding pair of said clips.
- A-multi-strand filament mount for electron tubes comprising, a pair of spaced coaxial an- .nularfilamentanchoring members each of thin- -wal1ed-tubular metal stock, each member having an integral flange, a plurality of radially discrete filament support tabs fastened to the flange on one member, a corresponding plurality of radially discrete filament support tabs fastened to the flange on the other member, and a plurality of filament strands each strand having its opposite ends connected respectively to a tab on one flange and the corresponding tab on the other flange, each of said thin-walled metal tubular members develop a predetermined localized amount of heat adjacent the filament ends attached thereto in response to the filament current flowing therethrough to maintain the said filament ends at substantially the same temperature as the remaining portions of the filament.
- a multi-strand filament mount comprising, a pair of axially spaced annular members of thinwalled metal stock, a ring of highly conductive metal to which one annular member is fastened, another ring of highly conductive metal to which the other annular member is fastened, and a plurality of filament strands bridged across the rims of said annular members to form a basketlike structure, each of said thin-walled annular members having a predetermined electrical resistance to develop a predetermined localized amount of heat adjacent the filament ends ator laterally extending portions which a e an- 7 tached thereto in response to the filamen stir ice-#104271 :rent :flowing ttherethrough to maintain thes-said filament ends at substantiallysthesame tempera- :ture as the :remaining portions iOf the.'fil-ament, each'ofsaid rims having attached. theretoaiserie's :of .circumferentially spacedtradially; discrete
- A. multi-strand filament mount comprising, .;a .pair of radially spaced "annular members :of thin-walled :metal. stock, v.a radially rigid :metal ring to which one of :said members :is fastened, another radially rigid .metal ring T110 which ;the other 'of said members :is fastened, each ;of said annular. members having a flange 'lextending parallel vtofltheir common axis, and a pluralitycof filament strips bridged :across :said flanges and disposed in radially extending.
- a multi-strand filament mount for electron tubes comprising in combination "a pair Of annular metal blocks, a tubular member of "thinwalled metal stock fastened-tonne o'fsaid-blocks, another tubular .member of thin-walled metal stock fastened-to the other block, each of said:
- a filament mount for high power radio tubes comprising incombinationapair'of'spaced :metal bodies of vgood heat rconductivity and low ielectric-:resistance, a plurality of-yfilament strands supported at opposite ends from said bodies, and :means interposed between each filament end and itspoint of attachment to the associated metal "body, the last-mentioned means-being 'ofva mate- ?rial difierent from the material of said bodies and having a ,much higher electrical resistance for developing; a predetermined. localized amount of heat adjacent the said points of attachment of the filament strands by reason of the. filament current flowing therethrough which localized vheat maintains the filament endsat substantially the same temperature asthe remainder of the filament.
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- Electron Sources, Ion Sources (AREA)
Description
June 6,1950 'J. w. CLARK 2,510,171
FILAMENT MOUNT FOR HIGH POWER TUBES Filed May 25, 1948 2 sheets-sheet 1 FIG. I. r ||||||||Hl Jo HIV W CLARK lhwentor Gttorueg June 6, 1950 J. w. CLARK 2,510,171
FILAMENT MOUNT FOR HIGH POWER TUBES Filed May 25. 1948 2 sheds-s58 2 Patented June 6, 1950 FILAMENT MOUNT FOR HIGH-POWER TUBES John W. Clark, Cedar Rapids, Iowa, assignor to,
Collins Radio Company, Cedar Rapids, Iowa, a corporation of Iowa Application May 25, 1948, Serial No. 28,984
13 Claims.
This invention relates to high power electron tubes, and more especially it relates to thermionic filament units or mounts for such tubes.
A principal object of the invention is to provide a more efiicient thermionic filament mount for high power electron tubes.
Another object isto provide an improved multisection filament and mount for high power tubes, wherein filament bowing is reduced to a minimum.
Another object is to provide a filament mount of the basket type, wherein the filament strips or sections are mounted so as to preserve their proper spaced relation with respect to an associated grid, while permitting each strip or section to elongate without bowing.
Another object is to provide a filament mount of the basket type,,wherein the efiects of end cooling are reduced to a A feature of the invention relates to an improved high power thermionic filament mount, wherein the filament strips are supported in parallel longitudinal array and equi-distant around a common .center for cooperation with a surrounding grid.
Another feature relates to an improved high power thermionic filament mount, wherein the filament strips are supported in radialand substantially planar array with respect to a common center for cooperation with a corresponding planar grid.
Another feature relates to an improved thermionic filament and mount which is particularly useful in high power ultra-high-frequency tubes, wherein the electron transit time between the filament and control grid must be accurately determined with respect to the operating frequency of. the tube. An example of such a tube is the so-called Resnatron, as disclosed for example in U. S. Patent No. 2,405,763.
A still further feature relates to the novel organization, arrangement and relative location of parts which cooperate to provide an improved filament mount for high power electron tubes, particularly those of the ultra-high-frequency type.
Other features andadvantages not particularly enumerated, will be apparent after a consideration of the following detailed descriptions and the appended claims.
In the drawing:
Fig. l is a generalized view, partly perspective and partly sectional, of a filament mount embodying certain features of the invention.
Fig. 2 is a vertical sectional view of one filament mount structure according to the invention.
Fig. 3 is a top plan view of Fig. 2.
Fig. 4 is a bottom plan view of Fig. 2.
Fig. 5 is a vertical sectional view of a modified. filament mount according to the invention.
Fig. 6 is a top plan View of Fig. 5.
Fig. 7 shows the general method of supporting the mount of Figs. 2 and 3 within a tube envelope or housing.
Fig. 8 shows the general arrangement for supporting the filament mount of Fig. 5 Within an evacuated tube or housing.
In certain kinds of high power ultra-high-frequency electron tubes, of which the so-called "Resnatron is typical, the factor of electron transit time between the cathode and control grid is of great importance. For example in the Resnatron, the useful emission which reaches the anode is dependent upon a space charge layer adjacent the cathode which is of sufiicient thinness so as not materially to increase the transit time of an electron in its trajectory between the cathode and the control grid. However, in order to achieve the best results with that type of tube, not only must'the filament be capable of supplying large quantities of electrons, but it must also preserve a uniform space relation with respect to the adjacent grid, even at the very high temperatures at which the filament operates- Furthermore, it is highly important that the temperature at each point of the filament strip be as uniform as possible. Because of the necessity of providing relatively massive anchoring rings or supports for the multi-strip filament, the problem of end cooling is of much greater importance in ultra-high-frequency power tubes than it is in conventional tubes to be used at relatively low frequencies. The filament supports for such ultra-high-frequency high power tubes must therefore perform three separate functions. They must support the filament in the proper spatial relation to the grid; they must permit the filament strip to elongate when hot, to minimize bowing; and they must cause no substantial end cooling. I have found that these three objectives can be realized by appropriate design of the supports and by appropriate choice of materials, dimensions andshapes for the various components of the mount asa whole.
In the filament mount according to the invention, the filament consists of a series of linear parallel strips arranged in a circular array around a common center so as to cooperate with an adjacent grid. The support for-such a mount therelugs, but a radialdisplacement tends merely to stretch the lugs without.afiectin there uired rigidity of the filament support.
Such an arrangement is shown in generalized form in Fig. 1, comprising a thin-walled metal, tube 1, for example of nickel, which at its lower 7 end is welded or otherwise rigidly vfastenedto a: copper ring 2. The upper end of tube I is bent at right angles to form the desired .numberof integral and radially extending'lugs 3." Welded 1 to the ends of lugs 3 are respective tabs 4 of a refractory metal such as tantalum. Vertically beneath the ring 2 and rigidly supported" in spaced relation thereto is another copperringgi which has welded or otherwise fastened thereto another thin-walledmetal.tube: 6 whose upper end is bentat rightanglestoform integralradial lugs T'equal "in number to, landvertically aligned with, the lugs 3. Weldedto the lugs Tare tabs 8 of refractory. metal, suchas tantalum. A'nohored'at opposite ends .totheresp'ective tabs 4 0 and 8are the various filament'strips fic oftunigsten or.other similar materialiwhich is conventionall'yfusedlfor electron-emitting cathodes in electron tubes. The filamentstrip's are arranged" to, be heated by. connectingthe terminals of a suitable currentsupply respectively to rings 2 and'Sf Byproperdsign o'f'the dimensions and materials for the various elements asidescribed, no substantial end cooling?" of the filament strips takes place. Thus when the mount isprop- 0 er ly, designed, .if the filament .strips are removed andthe two endsofthe'iriountare joined together, the hot?"'end.f.of. the'niount would just reach" fila'mentl operating. temperature at' the above integral either numerically or by using a polynomial approximation: for the three functions. In this way by a series of trials one can find a combination of cross-section and length which gives the desired temperature drop.
While .Fig... 1-..shows the thin-walled tubular member I having one end bent over at right anglesto forma series of separate radially ex- 'tenol in gglugs this is' not necessary. Thus the thinewalled ,tubularmember I may be provided with a continuous right-angled flange, and the tabs-4*can-"be-radially attached to this flange at appropriate; circumferentially spaced points.
Referring to Figs. 2 to 4, there is shown one actual construction or mount which has been fdund to possess the desired characteristics. It comprises ail'ow'er, ring 9"" of copper or other" metal of good"heatfcorrductivity.' Fitted "into-a" recessrin the; upper internal face"of"ring"9*is"a thin-walled 'nickeltubeil ll'fwhichimaybe'welded" to ringj. The upperjendoftubel Wisfbent out wardly to forma .rig'ht aIIgledfiangeI I. Welded to flange llsoj'asito extend'fi'radially"outward" therefrom, are the equallyspaced tantalimrtabs I2. The outer end of .each tab [2 may be inth'e" form of a clip '13 to receivethe 'ri'ght angledend I 4 "of the corresponding filament fstrip I 5 which may be'weldedfto, the tantalum? tabi The filament 'stripsare arrang'efso that'th'efl main length ISTthereofiextnds' parallel: to the axis of ring 9. The upper end; offeach' filament stripislikewise bent"atl"righ't angles and is fas-v tened. or weldedto a corresponding tantalum tab" IS. The tabs l6" are welded to, and "extend radialratedfil'ament"'current.' Consequently whenthe lyoutward from,th.e.fiange lip ITofa thin wall'ed filamentstrips are assenibld'inthe mount, they are suspended'lbetween supports which are at the same temperature as.thfe filament, and no heat is conducted away. from the filament ends. Therefore the cross-'secti'onlof the, mount sh be carefully chosen. so .as to. achieve: the desired. result.- The temperature.offthe hot end ofthe filament is determinedjbya .balance between the I R'Theat generatedlin the. mount itself; by the: heat "lostthrough' radiationifomithe mount it- 5 self 1 andby, the lieat icon'ductedaway. from the eoolj"'endTof 'the mount. This energy. can be, formulated in 'accordancewith the following in V tegro-difier'ential equation;
The-formal solutionofthisequation is:
where T1 isthe-"temperature of" the hot end and -T thatof the cold end:
When -p; o',- and "r as functionsI-of T areknownt experimentally; on'e can 'rf hmda 1 proceedto evaluate the" nickel .tube l8 similar to itub'e liiia The tube I8 is rigidly anchored orweldedwith'in a recess I9" in the lower face of the, upper ,ring member. 20 of copper or the like. It wiIIb'e understood; that thetabslii are inverticalalignment with the corresponding tabs IZI If desired, the-strips l5.v ree heu t eir-1 rticaldee ihm r Pr e th-@ 61 were v i ell r ieed ne b e asses. o l eat o .1 1;- 3 e se em lateral rigidity. The rings 9 and 2i] haverespecfiver-flan es 1.2.23; wh c extendputwardlvalo t e;hQrizon a ;pQrt Qn preach-fi ament s rip.- Q- act; as;electronssl'iieldsjso;'that',: the..e1ectron .emise I sion. fromzthe filament: -.S13EipS1isz;CO11find.-' imgemera-l. to.:,a..rad=ial trajectory... Thearingsfi. and i.2fl..l
areasuitablyg-fastened tolrespectiverigids'supportsi which-.lmay also.=.be connectedlato the terminalsof a, suitable'heatingmurrentsupply; Thus; there is shown in Fig. 7, anenclosing evacuatedvessel- Or -housing :24 Extending-through one end of this vesse1is-atubular-metal member :2 fi' 'wh'ich fits over the r ing l il and 'can b'e'iastened' thereto by-su itab1e-=screws-'261 Likewise, there--is"fitted" into -the' lower 'ring*9 a tubular metal member-275" The members 25 and 2'! .are connected to re-- spective terminalsofasuitab1e"ifi1ament 'current supply source: The filament 'mount'is. surrounded. by one" or'more-suita'ble' -grids andjan anode (not shown), so as to complete the electron circuit for thetube.
Referring to Figs; 5" and 61. there. isshown a modification; wherein the filamentstrips. instead 1 of being in the form ofialtub'ular basket,fare mounted in'aradialplanar array. In this'embodimentthere is provided anickel ring. 2 S'formed of thin=walled"metal" stock. Surrounding the strips 32.
Likewise welded or otherwise fastened to the vertical rim of ring 29 is a similar series of tantalum tabs 3|, the tabs 39 and 3| being in radial alignment. The filament strips 32 are each in the form of a tungsten strip having the ends bent downwardly at right angles and welded or otherwise fastened to the ends of the corresponding tabs 39, 3|. For the purpose of shielding the mount against back emission, there is welded to the ring 29 on the inner periphery thereof, a
2. A multi-strand filament mount according to claim 1, in which each of said tabs is an integral extension of the rim of the corresponding one of said members each of said strands has a main portion extending parallel to the common axis of said coaxial members, and a pair of laterally extending portions which are respectively anchored to said annular members around the periphery thereof.
3. A multi-strand filament mount according to claim 1, in which each of said strands has a main portion extending radially outward from the common center of said coaxial members, and a pair having a predetermined electrical resistance to ;chored respectively to said coaxial members around the periphery thereof.
\4..A multi-strand filament mount for electron tubes, comprising, a pair of coaxial annular filament anchoring members. each in the form of thin-walled metal tubular stock having its rim bent at substantially right angles, a ring of highly conductive metal for each member and to which .it is :rigidly fastened while permitting said rim to flex with respect to thering, a plurality of radially discrete filament support tabs carried by the rim of one of said members, a corresponding plurality of ,radially discrete filament support tabs carried by the rim of the other of said .members, the .tabs on said members being ar- .to a corresponding aligned pair of tabs, each of said thin-Walled metal tubular members having a predetermined electrical resistance to develop a predetermined localized amount of heat adjacent the filament ends attached thereto in response to the filament current flowing therethrough to maintain the said filament ends at substantiallythe same temperature as the remaining portions of the filament.
.5. AfiIament mount according to claim 4, in which each of said rings is rigid in a radial direction.
6. A multi-strand filament mount for electron tubes, comprising, a pair of spaced coaxial annular filament anchoring members each of thinwalled tubular metal stock, a plurality of radially discrete filament anchoring lugs radially extending from the rim of one of said members, a correto each lug, and a filament strand fastened at its opposite ends to a corresponding pair of said clips.
'1. A-multi-strand filament mount for electron tubes, comprising, a pair of spaced coaxial an- .nularfilamentanchoring members each of thin- -wal1ed-tubular metal stock, each member having an integral flange, a plurality of radially discrete filament support tabs fastened to the flange on one member, a corresponding plurality of radially discrete filament support tabs fastened to the flange on the other member, and a plurality of filament strands each strand having its opposite ends connected respectively to a tab on one flange and the corresponding tab on the other flange, each of said thin-walled metal tubular members develop a predetermined localized amount of heat adjacent the filament ends attached thereto in response to the filament current flowing therethrough to maintain the said filament ends at substantially the same temperature as the remaining portions of the filament.
8. A multi-strand filament mount, comprising, a pair of axially spaced annular members of thinwalled metal stock, a ring of highly conductive metal to which one annular member is fastened, another ring of highly conductive metal to which the other annular member is fastened, and a plurality of filament strands bridged across the rims of said annular members to form a basketlike structure, each of said thin-walled annular members having a predetermined electrical resistance to develop a predetermined localized amount of heat adjacent the filament ends ator laterally extending portions which a e an- 7 tached thereto in response to the filamen stir ice-#104271 :rent :flowing ttherethrough to maintain thes-said filament ends at substantiallysthesame tempera- :ture as the :remaining portions iOf the.'fil-ament, each'ofsaid rims having attached. theretoaiserie's :of .circumferentially spacedtradially; discrete anchoring tabs to whichthe respective rendsoifsaid ufilament strands are connected.
9. A. multi-strand filament mount, comprising, .;a .pair of radially spaced "annular members :of thin-walled :metal. stock, v.a radially rigid :metal ring to which one of :said members :is fastened, another radially rigid .metal ring T110 which ;the other 'of said members :is fastened, each ;of said annular. members having a flange 'lextending parallel vtofltheir common axis, and a pluralitycof filament strips bridged :across :said flanges and disposed in radially extending. array around :said common axis,- said :thin-walled .annular'members .having :a predetermined electrical resistance .to "develop a predetermined localizedamountiofheat adjacent the filament ends attached thereto in response :to the filament currentflowing therethrough to maintain :the said 'filament endsiat substantially the same temperature as the remaining portions of the filament, each of saidv flanges having attached thereto a series "of circumferentially spaced radially discrete anchoring tabs to which the respective :ends of the said filament strips are connected.
'10. A multi-strand filament mount for electron tubes, comprising in combination "a pair Of annular metal blocks, a tubular member of "thinwalled metal stock fastened-tonne o'fsaid-blocks, another tubular .member of thin-walled metal stock fastened-to the other block, each of said:
memberShaVing across-sectional thickness which is small in comparison with the cross-sectional thickness of the associated block and-having an 1 integral flange of small cross-sectional thickness extending-radially therefrom, and a plurality of filament strips each being anchored at -.its opposite ends to a respective one of said flanges through the intermediary of --respectiveradially --discrete .lugs attached --'to said Lfianges, and each "of said thin-walledmetal tubular'members hav--;
sing :a predetermined electrical resistance which .is low in comparison with therelectrical resistanceof the associated block for.-developing a predetermined localized amount-of heat adjacent the filament ends attached tothe blocks in response to filament current flowing therethrough :and thereby maintaining said filamentends at substantially the same temperature-as the re- :mainingportions of thefilament.
-11. A multi-strand filament mount-for electron,
tubes, comprising in combination a paired annular metal blocks of highconductivity ,-'a.itubular metal member of thin-walled stock -fastened '=to ione cof sa-id Jblocks; sanotherstubularz metal :mem- -ber: of thin-walled :Istock ifastened 'to .the other rblock, eachs-of .saidwmembers having a crossa sectional thickness which is small in comparison -with the cross-sectional thickness of'theasso- .;ciated. ;block,'ieach member having anintegral -fiange extending radially :outward therefrom, -:a :.plurality 50f :discretet-filament support tabs in spaced relation around each of :said flanges,;an'd 'azplurality of filament strips. each having :its ioppositeeends :anchored .to ';a corresponding pair 10f said tabs'sand 83011501 said thin-walled tubular zmembers and flanges having :a predetermined electrical resistance which. is high in comparison with tthe electrical resistance of the associated ;block :for developing :a predetermined localized :amount of. heat adjacent :the filament ends stattached-thereto iII'zlSPOllSe to the filament current :flow to thereby v maintain the said filament ends at substantially :the same .temperaturei'as the remaining portions :01 the; filament.
,12. .A multi-strand filament vmount according to claim 11: in which each of :said metal blocks .is of copper and 'said'tubular members vare of nickel, said 'tabs being of tantalum and :said .zfilament' strips being of tungsten.
13. "A filament mount for high power radio tubes, comprising incombinationapair'of'spaced :metal bodies of vgood heat rconductivity and low ielectric-:resistance, a plurality of-yfilament strands supported at opposite ends from said bodies, and :means interposed between each filament end and itspoint of attachment to the associated metal "body, the last-mentioned means-being 'ofva mate- ?rial difierent from the material of said bodies and having a ,much higher electrical resistance for developing; a predetermined. localized amount of heat adjacent the said points of attachment of the filament strands by reason of the. filament current flowing therethrough which localized vheat maintains the filament endsat substantially the same temperature asthe remainder of the filament.
Y-JOHN W CLARK.
"REFERENCES CITED The following references r are 1 of record :in the file of this -;patent:
3 STATES "PATENTS Number Name Date 2,164,477 :Smith :July 4, 1939 233851435 "Werner etal. Sept. 25;:194'5 2,405,762 "Sloan Aug. '13, 1946 23141349 Eite'l 'etal May "11,1948 "245L987 Sloan Oct. "19,1948
""2,4'52,786 ON-eill Nov. 2, 1948
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US28984A US2510171A (en) | 1948-05-25 | 1948-05-25 | Filament mount for high-power tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US28984A US2510171A (en) | 1948-05-25 | 1948-05-25 | Filament mount for high-power tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2510171A true US2510171A (en) | 1950-06-06 |
Family
ID=21846592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US28984A Expired - Lifetime US2510171A (en) | 1948-05-25 | 1948-05-25 | Filament mount for high-power tubes |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2510171A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2841736A (en) * | 1953-06-05 | 1958-07-01 | Rca Corp | Electron tube and filamentary cathode |
| US2866122A (en) * | 1950-09-15 | 1958-12-23 | Machlett Lab Inc | Electron discharge tubes |
| US4546286A (en) * | 1982-07-27 | 1985-10-08 | Bbc Brown, Boveri & Company, Limited | Electron tube, in particular a transmitter tube |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2164477A (en) * | 1938-04-29 | 1939-07-04 | Rca Corp | Electrode support |
| US2385435A (en) * | 1944-10-23 | 1945-09-25 | Westinghouse Electric Corp | Electron discharge device |
| US2405762A (en) * | 1940-11-04 | 1946-08-13 | Research Corp | Structure for supporting filaments in vacuum tubes |
| US2441349A (en) * | 1945-10-02 | 1948-05-11 | Eitel Mccullough Inc | Electrode mounting structure for electron tubes |
| US2451987A (en) * | 1944-03-17 | 1948-10-19 | Westinghouse Electric Corp | Electronic tube for ultra high frequencies |
| US2452786A (en) * | 1946-02-18 | 1948-11-02 | Harry T O'neill | Cathode structure |
-
1948
- 1948-05-25 US US28984A patent/US2510171A/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2164477A (en) * | 1938-04-29 | 1939-07-04 | Rca Corp | Electrode support |
| US2405762A (en) * | 1940-11-04 | 1946-08-13 | Research Corp | Structure for supporting filaments in vacuum tubes |
| US2451987A (en) * | 1944-03-17 | 1948-10-19 | Westinghouse Electric Corp | Electronic tube for ultra high frequencies |
| US2385435A (en) * | 1944-10-23 | 1945-09-25 | Westinghouse Electric Corp | Electron discharge device |
| US2441349A (en) * | 1945-10-02 | 1948-05-11 | Eitel Mccullough Inc | Electrode mounting structure for electron tubes |
| US2452786A (en) * | 1946-02-18 | 1948-11-02 | Harry T O'neill | Cathode structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2866122A (en) * | 1950-09-15 | 1958-12-23 | Machlett Lab Inc | Electron discharge tubes |
| US2841736A (en) * | 1953-06-05 | 1958-07-01 | Rca Corp | Electron tube and filamentary cathode |
| US4546286A (en) * | 1982-07-27 | 1985-10-08 | Bbc Brown, Boveri & Company, Limited | Electron tube, in particular a transmitter tube |
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