US3875445A - Meshed cathode for electron tubes of the grid-controlled type - Google Patents

Meshed cathode for electron tubes of the grid-controlled type Download PDF

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Publication number
US3875445A
US3875445A US394489A US39448973A US3875445A US 3875445 A US3875445 A US 3875445A US 394489 A US394489 A US 394489A US 39448973 A US39448973 A US 39448973A US 3875445 A US3875445 A US 3875445A
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United States
Prior art keywords
cathode
meshed
support
recesses
meshed cathode
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US394489A
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English (en)
Inventor
Robert Bachmann
Hans Notz
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BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
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BBC Brown Boveri France SA
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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

Definitions

  • ABSTRACT A meshed cathode structure particularly for use in Foreign Application U' Data high power grid-controlled transmitting tubes com- Sept 6. 1972 Switzerland l303l/72 prises an electrically conductive tubular current leadin member provided with a frusto-conical support [52] US. Cl 313/348, 3 [3/34], 3l3/348, which is also electrically conductive.
  • the periphery of the frusto-conical support is provided with circular ar- [51] rays of uniformly spaced apertures and recesses, the J J arrays being offset circumferentially relative to one [58] Field of Search 3l3/34l, 346, 348 another. and the adjoining ends of two cylindrical meshed cathode components are welded respectively [56] References Cited at mesh junction points at the apertures and recesses.
  • the present invention relates to an improved construction for a meshed cathode structure for electron tubes, particularly for maximum power, grid-controlled transmitting tubes, wherein adjacent ends of component cathodes are rigidly connected to a coaxial supply conduit, which is connected to a lead in the tube base.
  • meshed cathodes with holding members, which are mounted in an insulated manner on a central supporting rod, in order to prevent deformation of the meshed cathode in its axial direction, if a thermal expansion of the cathode wires occurs.
  • the holding members are intended to establish an improvement in the mechanical stability of the meshed cathode in the axial direction. (DBGM l 823 41]). It
  • a meshed cathode provided with a central supporting rod, to mount a ring in an insulated manner on this supporting rod, the external diameter of the ring being equal to the internal diameter of the meshed cathode.
  • a meshed cathode is likewise known which comprises, opposite a supporting rod, an insulated annular disc which has an external diameter coinciding substantially with the internal diameter of the meshed cathode in such a manner that the cathode wires of the meshed cathode bear loosely against the annular disc.
  • the known devices have various disadvantages, how ever, which consist. in particular, in that in large meshed cathodes, particularly in those which have a long length of the cathode in comparison with the diameter, there is the risk of deformation during operation. Even in so called two-tier meshed cathodes, there is a serious disadvantage in the fact that the incandescent length of the whole cathode is interrupted in the middle, the length ofthis interruption depending essentially on the construction of the connection of the abutting ends of the two component cathodes to the current supply at the center of the cathode.
  • the above-mentioned problem is solved by the fact that a current-conducting support is provided to connect the grid portions forming the meshed cathode.
  • the support is an annular member which comprises apertures and recesses at the outer periphery.
  • the advantage of the construction according to the invention consists in particular in that the current supply to the meshed cathode can be effected through a single conduit while the annular member is mounted on the tubular duct for the cathode center (CF conduit). This leads to the possibility of the interruption in the incandescent length of the two cathode parts being considerably reduced.
  • the outer periphery is constructed in the form of a serpentine bend. This construction enables the two parts of the meshed cathode to be offset circumferentially by half a horizontal mesh diagonal in relation to one another.
  • the upper cathode component is welded to the support for the cathode center being offset circumferentially by half a mesh diagonal in relation to the other and likewise offset in height by half a mesh diagonal in relation to the other so that the two cathode components are aligned one above the other with the minimum possible interruption.
  • Mutual alignment of the two cathode components is of particular importance when the wire arrangement forming the control grid in the electron tube has to have a specific orientation with regard to the cathode wires and specifically with regard to their points of intersection.
  • the supply conduit is designated by l which is disposed concentrically with a tubular duct 2 for feeding current to the cathode center.
  • annular support 3 Secured to duct 2 is an annular support 3 having a frusto-conical configuration and to which the two-part cathode structure is secured at its center.
  • a serpentine web 5 Formed at the outer periphery 4 of the support 3 is a serpentine web 5 established by a circumferential array of uniformly spaced apertures 6 and a circumferential array of uniformly spaced recesses 7 having the same spacing as the apertures 6.
  • the apertures 6 and recesses 7 are circumferentially i.e. laterally offset in such manner that each aperture 6 is located centrally between adjacent recesses 7.
  • the meshes 8 of the two cylindrical meshed cathode components 9, 9 are welded onto the web 5 in such manner that the welding points 10 for the meshes 8 are disposed so that, for example, the upper meshed cathode component 9' is welded to the upper edges of the recesses 7 in the periphery of support 3 circumferentially offset from the lower meshed component 9 welded to the lower edges of the aperture 6 by half a horizontal mesh diagonal 11, and wherein the ends of the two components, i.e., the welding points thereof are disposed at the same height on the support web 5.
  • FIG. 2 which is similar to FIG.
  • a meshed cathode structure for electron tubes and which is particularly useful for high power gridcontrolled transmitting tubes which comprises a supply conduit connectible to a lead-in in the base of the tube,
  • a current-conducting support for the cathode structure secured to said supply conduit said support being constituted by an annular member which includes a first circumferential array of uniformly spaced recesses pro vided in the peripheral edge of said annular support member and a second circumferential array of uniformly spaced apertures provided in the peripheral portion of said annular support member and circumferentially offset from said circumferential array of recesses so as to lie intermediate the latter, a first cylindrical meshed cathode component, the meshes at one ,end of which are secured at said circumferentially spaced recesses, and a second co-axial cylindrical meshed cathode component adjacent said first cathode component and wherein the meshes at one end thereof are secured at said circumferentially spaced apertures.

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  • Electrodes For Cathode-Ray Tubes (AREA)
  • Microwave Tubes (AREA)
  • Electron Sources, Ion Sources (AREA)
US394489A 1972-09-06 1973-09-05 Meshed cathode for electron tubes of the grid-controlled type Expired - Lifetime US3875445A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1303172A CH549283A (de) 1972-09-06 1972-09-06 Maschenkathode fuer elektronenroehren.

Publications (1)

Publication Number Publication Date
US3875445A true US3875445A (en) 1975-04-01

Family

ID=4388683

Family Applications (1)

Application Number Title Priority Date Filing Date
US394489A Expired - Lifetime US3875445A (en) 1972-09-06 1973-09-05 Meshed cathode for electron tubes of the grid-controlled type

Country Status (6)

Country Link
US (1) US3875445A (de)
CH (1) CH549283A (de)
DE (1) DE2247364C2 (de)
FR (1) FR2198253B3 (de)
GB (1) GB1436429A (de)
NL (1) NL182184C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443735A (en) * 1980-02-05 1984-04-17 Alexandrov Vladimir N Directly heated meshed cathode for electronic tubes and method of making

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449616A (en) * 1965-07-20 1969-06-10 Thomson Houston Comp Francaise Tubular mesh cathode for high-power electronic tubes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE863831C (de) * 1950-05-17 1953-01-19 Siemens Ag Kathode fuer Elektronenroehren
DE1823411U (de) * 1958-07-01 1960-12-15 Siemens Ag Kathode fuer elektronenroehren.
GB987461A (en) * 1962-05-31 1965-03-31 Standard Telephones Cables Ltd Thermionic valves
DE1901207A1 (de) * 1969-01-10 1970-08-06 Siemens Ag Maschenkathode fuer Elektronenroehren hoher Leistung,insbesondere Senderoehren
DE1901208A1 (de) * 1969-01-10 1970-07-30 Siemens Ag Rohrfoermige Maschenkathode fuer Elektronenroehren hoher Leistung,insbesondere Senderoehren

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449616A (en) * 1965-07-20 1969-06-10 Thomson Houston Comp Francaise Tubular mesh cathode for high-power electronic tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443735A (en) * 1980-02-05 1984-04-17 Alexandrov Vladimir N Directly heated meshed cathode for electronic tubes and method of making

Also Published As

Publication number Publication date
FR2198253A1 (de) 1974-03-29
NL182184C (nl) 1988-01-18
GB1436429A (en) 1976-05-19
NL7312150A (de) 1974-03-08
CH549283A (de) 1974-05-15
DE2247364C2 (de) 1984-05-17
NL182184B (nl) 1987-08-17
DE2247364A1 (de) 1974-03-14
FR2198253B3 (de) 1976-08-06

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