US2736835A - Electric discharge tube - Google Patents

Electric discharge tube Download PDF

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Publication number
US2736835A
US2736835A US293069A US29306952A US2736835A US 2736835 A US2736835 A US 2736835A US 293069 A US293069 A US 293069A US 29306952 A US29306952 A US 29306952A US 2736835 A US2736835 A US 2736835A
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US
United States
Prior art keywords
cathode
collar
electric discharge
conductor
discharge tube
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
US293069A
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English (en)
Inventor
Hendrikus Johannes Marie V Tol
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
Application granted granted Critical
Publication of US2736835A publication Critical patent/US2736835A/en
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Classifications

    • 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 electric discharge tubes the cathode of which is provided with a collar and a striplike leading-in conductor which is soldered to the cathode at the very end adjacent the collar.
  • Such discharge tubes have a limitation in that the cathode can be held in a downward direction but not in an upward direction, with the result that the cathode may move upwards and the lower end may even become detached from the centering member, in that the cathodeconnecting wire cannot extend straight downwards since the leading-in conductors, which constitute the contact pins, are arranged to follow a circle, so that the thin leading-in conductor must extend almost horizontally and is thus prevented from obstructing upward movement of the cathode without the use of additional expedients.
  • the bentover part is arranged Within the electrode system and is located immediately above the recess formed in the mica for this conductor and must have a comparatively large cross-sectional area to be able to absorb the force by means of which the cathode is pressed into the centering disc during the component mounting, the more so as the upper end of the bent-over part cannot be soldered in position but is free, this bent-over part must extend to a comparatively large distance outside the cathode surface with the result that either the cathode'grid spacing must be large or the grid must end at a short distance from the centering member, which, however, is inconvenient.
  • a thick conductor brings about intense heat dissipation, apart from the fact that it is not simple to bend and arrange the conductor in the correct manner, since the weld finds its way into the aperture formed in the centering member.
  • an electric discharge tube comprising a cathode of the indirectly heated type, the cathode sleeve of which is provided at one end with a collar and is arranged in an insulating centering member at least by means of this end, a thin supply conductor being secured to the extremity of this end of the cathode sleeve, this supply conductor is formed between the weld and the centering member in a manner such that this conductor jointly with the collar holds the cathode in the aperture of the insulating member against movements in the direction of length of the cathode.
  • the supply conductor may be bent in the form of a loop or severed immediately below the centering member. In the latter case, the free end of the conductor springs slightly away from the cathode sleeve and thus locks the cathode.
  • Fig. 1 shows a cathode prior to component mounting
  • Fig. 2 shows a cathode subsequent to component mounting and Fig. 3 shows an alternative embodiment of the inven' tion.
  • the cathode sleeve 1 comprises at one end a collar 2.
  • the strip 5 is soldered in position in a manner such that the part 3 extends beyond the weld.
  • the part 3 is bent out just below the centering disc 6 to form a loop 7, for example with the use of tweezers,- so as to fix the cathode also in an upward direction.
  • the thickness of strip 5 is low so that little heat dissipation ensues and even the recess in the aperture in the centering disc can frequently be dispensed with thus assisting in simplifying the mounting operation.
  • a recess is provided it may be small enough to prevent difiiculty in view of the other apertures in the centering member.-
  • the loop is comparatively strong since it is secured in position at both ends.
  • the part 13 of conductor 10 is severed immediately below the centering. disc 11 and the excess part which is gripped between the cathode sleeve 8, the collar 9 and the centering disc 11 is removed.
  • the part 13 slightly recoils or is bent back so that its end engages the centering disc and thus holds the cathode in an upward direction.
  • an electric discharge tube comprising a s1eeve-type, indirectly heated cathode, said sleeve being provided with a collar adjacent to one end thereof, an insulating centering member positioned in said tube and having an aperture therein, part of said cathode being positioned in said aperture, and a relatively thin cathode supply conductor secured intermediate its ends to said cathode at a place at one end thereofv adjacent to the bottom circumferential edge of said cathode, said supply conductor having a free end held in said aperture between said collar and said centering member whereby said supply conductor and said collar coact to prevent said cathode from moving in axial directions thereof.
  • an electric discharge tube comprising a sleeve-type, indirectly heated cathode, said cathode being provided with a collar adjacent to one end thereof, an insulating centering member positioned in said tube and having an aperture therein, part of said cathode being positioned in said aperture, a relativeE thin cathode supply conductor being secured intermediate its end to said sleeve at a place at one end thereof adjacent to the bottom circumferential edge of said cathode, and one end of said supply conductor engaging the underside of said centering member, the portion of said supply conductor between said centering member and the point of securement of said supply conductor to said sleeve being at an acute angle to said centering member.

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  • Plasma Technology (AREA)
  • Lasers (AREA)
US293069A 1951-06-22 1952-06-12 Electric discharge tube Expired - Lifetime US2736835A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL705044X 1951-06-22

Publications (1)

Publication Number Publication Date
US2736835A true US2736835A (en) 1956-02-28

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ID=19812039

Family Applications (1)

Application Number Title Priority Date Filing Date
US293069A Expired - Lifetime US2736835A (en) 1951-06-22 1952-06-12 Electric discharge tube

Country Status (5)

Country Link
US (1) US2736835A (en, 2012)
BE (1) BE512266A (en, 2012)
FR (1) FR1058596A (en, 2012)
GB (1) GB705044A (en, 2012)
NL (1) NL81052C (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2961567A (en) * 1958-04-10 1960-11-22 Siemens Edison Swan Ltd Thermionic valves
US3065291A (en) * 1956-08-27 1962-11-20 Honeywell Regulator Co Electron discharge device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1974916A (en) * 1934-04-25 1934-09-25 Hygrade Sylvania Corp Electron discharge device
US1991174A (en) * 1933-06-24 1935-02-12 Rca Corp Electron discharge device
US2206504A (en) * 1939-05-27 1940-07-02 Rca Corp Electrode support
US2266622A (en) * 1940-07-31 1941-12-16 Rca Corp Cathode sleeve
US2578370A (en) * 1950-04-25 1951-12-11 Bell Telephone Labor Inc Gaseous discharge device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1991174A (en) * 1933-06-24 1935-02-12 Rca Corp Electron discharge device
US1974916A (en) * 1934-04-25 1934-09-25 Hygrade Sylvania Corp Electron discharge device
US2206504A (en) * 1939-05-27 1940-07-02 Rca Corp Electrode support
US2266622A (en) * 1940-07-31 1941-12-16 Rca Corp Cathode sleeve
US2578370A (en) * 1950-04-25 1951-12-11 Bell Telephone Labor Inc Gaseous discharge device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065291A (en) * 1956-08-27 1962-11-20 Honeywell Regulator Co Electron discharge device
US2961567A (en) * 1958-04-10 1960-11-22 Siemens Edison Swan Ltd Thermionic valves

Also Published As

Publication number Publication date
NL81052C (en, 2012)
FR1058596A (fr) 1954-03-17
GB705044A (en) 1954-03-03
BE512266A (en, 2012)

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