US2489367A - Cathode assembly for electric discharge tubes - Google Patents

Cathode assembly for electric discharge tubes Download PDF

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Publication number
US2489367A
US2489367A US790105A US79010547A US2489367A US 2489367 A US2489367 A US 2489367A US 790105 A US790105 A US 790105A US 79010547 A US79010547 A US 79010547A US 2489367 A US2489367 A US 2489367A
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US
United States
Prior art keywords
cathode
flattened
electric discharge
cathode assembly
discharge tubes
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 - Lifetime
Application number
US790105A
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English (en)
Inventor
Weyer Henricus Johannes De
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2489367A publication Critical patent/US2489367A/en
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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
    • 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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

Definitions

  • This invention relates to an electric discharge tube comprising an indirectly heated cathode which is formed by swaging and, drawing or rolling a tubular conductor containing one or more It has now been found that special advantages are obtained if the cathode is flattened at definite points.
  • the thermal losses are materially reduced if in an electric discharge tube comprising an indirectly heated cathode formed by swaging and drawing 'or rolling a tubular conductor containing one or more conductors with the interposition of powdered insulating material, which cathode is one or several times bent and, at least over part of its length, flattened, inactive cathode parts are flattened, according to the invention, at the points of support in such manner that the cathode engages the supporting members only with a narrow edge.
  • the cathode becomes rigid, i. e. that it does not tend to alter its shape spontaneously.
  • such a cathode is adapted to be supported in a very simple manner in insulating centring members.
  • Such a cathode is one or more times bent into the shape of a hair-pin or in zigzag fashion, it may be flattened at the bends and at the ends.
  • This flattening of the bends is preferably effected in a direction at right angles to the plane of the bend, so that the bend becomes rigid, whilst the heat transference to a supporting member engaging the bend, for example a tension spring, may be low, since the flattened bend of the cathode rests with a narrow edge on such a supporting member. Since the bend is rigid such a supporting member may, moreover, be very narrow.
  • the flattened curved parts may he slipped through a narrow slit in a centring member and hooked to a supporting member.
  • the flattened parts near the ends of the cathode serve to fasten the cathode ends in a centring member,- these flattened parts being, for ex-' ample, introduced into an aperture having a narrow slit in such manner as to extend at right angles to the longitudinal direction of the slit and prevent the cathode ends from being drawn through the slit. In this case it is consequently not necessary to secure cross-bars or supporting wires to the cathode ends, so that the dissipation of heat will be small.
  • the flattened parts at the ends of the cathode rest with a narrow edge onthe centring member, for example, a mica disc, so that only little heat is dissipated.
  • the ends may be flattened in the sameplane as the bends or at right angles thereto.
  • Figure 1 is a front view of a cathode assembly according to the invention
  • Fig. 2 is a side view of the cathode assembly
  • Fig. 3 is a sectional view taken along line 3--3 of Fig. 1, and
  • Fig. 4 is a transverse sectional view on an enlarged scale of the cathode shown in Fig. 1.
  • cathode l In the drawing the reference numeral I designates the cathode which in the present case is bent into the shape of a hair-pin and supported by means of the centring members 2 and 3.
  • cathode l comprises a central filament 6 surrounded by tubular outer conductor In, the intervening space being filled with a powdered insulating material Il.
  • the cathode l At about 0.5 mm. from its ends the cathode l is provided with flattened parts 4 which extend at right angles to the plane of the hair-pin and prevent the ends from being drawn through the apertures l, 8 of the centring member 2 consisting, for example, of mica.
  • these apertures exhibit preferably a wide part I for the introduction of the flattened cathode end 4 and a narrow part 8 into which the round part of the cathode can just be slipped but through which the flattened part 4 cannot pass.
  • the narrow part 8 may either exhibit the form of a slit to which the plane of the flattened part 4 extends at right angles, or be formed in a known manner by superposition of two insulating members in such manner that the cathode end is locked in a small aperture.
  • the curved part is likewise flattened, at least partly; but inethis case in-the plane of the bend, slipped through a slit 8 of the member 3 and hooked to the tension spring 9.
  • the cathode is heated by means of the filament 6 and is adapted to be flattened in a yerysimple manner by impact or pressure with the aid of a stamp.
  • the cathode is bent on a jig and flattened at the desired rp'oints; the cathode becomes rigid, i. e. -.thatwitno longer tends to alter its shape after. removal of the jig. This is promoted by the fact that the curved parts are flattened in the plane of, the hair-pin as shown in the drawing.
  • the supply to the cathode body is preferably effected at a point of suspension in a bend.
  • the cathode may consist 'of a plurality of parts which are bent to and fro one or several times, for example hair-pin shaped parts'which-may, extendin one plane or in' a cylindrical plane; rInstead of being I hair-pin shaped, the cathodemay also be V- or U-shaped, staggered orbent in any convenient Way.
  • a cathoderassembly. for an electric discharge tube comprising :asupporting member and an indirectly heated pat-bode member having a bent portion and aastraight-portion and comprising an inner conductor; an outerrconductor spacedly surrounding said inner conductor "and powdered insulating material separating and compactly filling the space-betweenzithe"inner'and outer conductors, the outer conductor at said bent'portion being flattenedr-in theplanez'of the bend and having a narrow edge and at said straight por- 4 tion being tubular, said bent portion engaging said supporting member at said narrow edge.
  • a cathode assembly for an electric discharge tube comprising a supporting member and an indirectly heated cathode member having an in- 7 nor conductor, 'anouter conductor spacedly surrounding said inner conductor and powdered insulating material separating and compactly filling'the space between the inner and outer conducto1's,.'said "outer conductor comprising a first tubular portion and second flattened end portions each having a narrow edge, said second end portions engaging said supporting member with the said narrow edge thereof.
  • A'cathode assembly for an electric discharge "tube comprising an upper insulating plate mem- 1' compactly filling the space between the inner and outer conductors, and a cathode tensioning member positioned above said upper insulating member,-said outer conductor comprising tubular portions intermediate the bent and end portionsof the said cathode and flattened portions at said bent and end portions each provided with a narrowedge, said end portions engaging said loweri'nsulating member with the narrow edge thereof and said bent portion being positioned within said slit and engaging said tensioning member with the narrow edge thereof.

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  • Electron Sources, Ion Sources (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Solid Thermionic Cathode (AREA)
US790105A 1946-11-13 1947-12-06 Cathode assembly for electric discharge tubes Expired - Lifetime US2489367A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL264502X 1946-11-13
CH230150T 1947-11-04

Publications (1)

Publication Number Publication Date
US2489367A true US2489367A (en) 1949-11-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
US790105A Expired - Lifetime US2489367A (en) 1946-11-13 1947-12-06 Cathode assembly for electric discharge tubes

Country Status (7)

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US (1) US2489367A (US06811534-20041102-M00003.png)
BE (1) BE478149A (US06811534-20041102-M00003.png)
CH (1) CH264502A (US06811534-20041102-M00003.png)
DE (1) DE890389C (US06811534-20041102-M00003.png)
FR (1) FR57812E (US06811534-20041102-M00003.png)
GB (1) GB652382A (US06811534-20041102-M00003.png)
NL (1) NL63789C (US06811534-20041102-M00003.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2626370A (en) * 1949-05-26 1953-01-20 Rca Corp Filament structure for electron discharge device
US4100449A (en) * 1976-04-05 1978-07-11 Rca Corporation Uniform filament and method of making the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1700454A (en) * 1924-07-08 1929-01-29 Western Electric Co Electron emitter and process of making the same
US2014787A (en) * 1933-06-24 1935-09-17 M O Valve Co Ltd Thermionic cathode
US2112969A (en) * 1926-12-11 1938-04-05 Rca Corp Cathode

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1700454A (en) * 1924-07-08 1929-01-29 Western Electric Co Electron emitter and process of making the same
US2112969A (en) * 1926-12-11 1938-04-05 Rca Corp Cathode
US2014787A (en) * 1933-06-24 1935-09-17 M O Valve Co Ltd Thermionic cathode

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2626370A (en) * 1949-05-26 1953-01-20 Rca Corp Filament structure for electron discharge device
US4100449A (en) * 1976-04-05 1978-07-11 Rca Corporation Uniform filament and method of making the same

Also Published As

Publication number Publication date
GB652382A (en) 1951-04-25
BE478149A (US06811534-20041102-M00003.png)
CH264502A (de) 1949-10-15
DE890389C (de) 1953-09-17
FR57812E (fr) 1953-09-17
NL63789C (US06811534-20041102-M00003.png)

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