US2741717A - Dispenser type cathode having gettercoated parts - Google Patents

Dispenser type cathode having gettercoated parts Download PDF

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US2741717A
US2741717A US292434A US29243452A US2741717A US 2741717 A US2741717 A US 2741717A US 292434 A US292434 A US 292434A US 29243452 A US29243452 A US 29243452A US 2741717 A US2741717 A US 2741717A
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elements
element
cathode
cathode body
side
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US292434A
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Katz Helmut
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Siemens and Halske AG
Siemens AG
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Siemens AG
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/14Means for obtaining or maintaining the desired pressure within the vessel
    • H01J7/18Means for absorbing or adsorbing gas, e.g. by gettering

Description

April 10, 1956 H. KATz 2,741,717

DISPENSER TYPE CATHODE HAVING GETTER-COATED PARTS Filed June 9, 1952 lmmn-lllllmnm 19 ,iyefgfof afg.

United States Patent DISPENSER TYPE CATHODE HAVING GETTER- COATED PARTS Helmut Katz, Erlangen, Germany, assigner to Siemens &

Halske Aktiengesellschaft, Munich and Berlin, Germany, a German corporation type cathodes, for use in electrical discharge devices, having a supply of emissive material which migrates at operating temperature through fine passages of a cathode body to the emitting surface formed thereby.

The object of the invention is to improve the production and operation of discharge devices of the above indicated type by the provision of getter substance upon selected parts of the cathode which do not serve electron emission or upon selected parts of elements connected or associated with the cathode which are during operation strongly heated.

Discharge devices having incandescible dispenser type cathodes have been proposed before. The fine passages for the migration of the emissive material to the cathode surface may be formed by wire or the like means which is tightly wound about the cathode body or by the pores of a sintered cathode body made of materials -such as tungsten or molybdenum which are particularly suitable when using thorium or barium compositions as emissive materials.

lt was found that it is of great advantage in the manufacture and operation of tubes of the type indicated above, to provide therein a volatile metal such, for example, as zirconium, which exhibits at operating temperatures a getter action so as to remove traces of gas remaining after evacuation. Difficulties were, however, encountered in many cases, for example, in at or disk-shaped cathodes, to select parts which become in operation hot enough so that the getter provided thereon would develop a satisfactory action.

The invention solves the problem as indicated before, by providing the getter on selected parts which do not serve electron emission but are subjected to strong heating. The getter is disposed so as to avoid interference with the radiation properties of the cathode.

The invention will be explained with reference to the accompanying drawing showing in diagrammatic manner an example thereof.

Numeral 11 indicates a hat or disklike cathode body of sintered tungsten or molybdenum. The emissive material 12 which may be barium or thorium is disposed in a receptacle 13 having a ange 14 which is suitably secured to the cathode body 11, for example, by soldering or welding. A tubular supporting member 15 having a ange 16 is similarly secured to the flange of the receptacle 13. The heater filament 17 is supported by the rod 18. Numeral 19 indicates a grid, 20 the anode, and 21 to 25 are connecting and terminal conductors for the various parts. Additional heater means (not shown) may be provided, for example, in the space between the side wall of the receptacle 13 and the inside wall of the supporting member 15. The envelope for the discharge tube has been omitted to avoid encumbering the drawing. It is understood of course that the various parts are by known and suitable means secured within the tube envelope and that the terminal conductors are carried to the outside of the tube in vacuumtight manner.

Fice

A getter substance, for example, zirconium, may be disposed on the inside of the tubular supporting member 1S as indicated at 26. The getter may also be provided on selected parts'ofthe grid A19, as indicated at 27, and if desired lalso on the rod 18, as indicated by the shading, or on the bottom of the receptacle 13, as indicated at 28. The side wall of the receptacle 13 may be provided with getter substance if desired.

While it is possible to dispose getter substance on all the elements noted above, it will suffice for most practical purposes to provide the getter only on selected parts or portions of some of the elements.

The drawing shows a cylindrical structure having a circular cathode body of dat or disklike shape. It is understood of course that the structure may be crosssectionally rectangular or the like.

Changes may be made within the scope and spirit of the appended claims.

I claim:

l. A dispenser type cathode for use in an electrical discharge device comprising a cathode body, a first element having a portion connected to said cathode body peripherally on one side thereof and forming therewith a receptacle containing an emissive material, a second tubular element having one end thereof connected to the portion of said first element which is connected to said cathode body peripherally on one yside thereof and extending axially therefrom, the side of said cathode which faces axially away from said elements being entirely exposed and forming the emitting surface, the inside wall of said tubular second element surrounding a portion of the outside Wall of said first element and forming a chamber therewith, a heater filament disposed within said chamber in spaced relation to each of said elements and means separate from said elements for connecting current to said filament to cause it to generate heat within said chamber for transfer substantially by radiation therefrom respectively to said iirst and said second elements so as to heat said emissive material and said cathode body for the purpose of causing migration of emissive material from said receptacle through said cathode body to the emitting surface formed thereby for emission therefrom substantially over the entire area of said surface, and a getter substance disposed on the side of the wall means of at least one of said elements which faces said heater filament.

2. A dispenser type cathode for use in an electrical discharge device comprising a cathode body, a i'irst element having a portion connected to said cadaode body peripherally on one side thereof and forming therewith a receptacle containing an emissive material, a second tubular element having one end thereof connected to the portion of said first element which is connected to said cathode body peripherally on one side thereof and extending axially therefrom, the side of said cathode body which faces axially away from said elements being entirely exposed and forming the emitting surface, the inside wall of said tubular second element surrounding a portion of the outside wall of said first element and forming a chamber therewith, a heater filament disposed within said chamber in spaced relation to said elements, a third element forming supporting member for said heater filament disposed in spaced relation thereto, means separate from said elements for connecting current to said filament to cause it to generate heat within said chamber for transfer substantially by radiation therefrom respectively to said first and said second and said third elements so as to heat said emissive material and said cathode body and also said third element for the purpose of causing migration of emissive material from said receptacle through said cathode body to the emitting surface formed thereby for emission therefrom substantially over the entire area of said surface, and a getter substance disposed on the side of Y the Awall means of at lest one of said lements which faces said heater lament. Y

3. The structure defmed in claim 1, comprising a disk- .like'substaptally frusfo-concal oathode body.

Y ReferencesCtod in the le of this patent Wooten Jan. 23,v 1945 Fulton May 14, 1946 Drggs June 29, 1948 Lockwood et al Sept. 21, 1948 Stanier May 30, 1950 Lemmens et Feb. 27, 1951

Claims (1)

1. A DISPENSER TYPE CATHODE FOR USE IN AN ELECTRICAL DISCHARGE DEVICE COMPRISING A CATHODE BODY, A FIRST ELEMENT HAVING A PORTION CONNECTED TO SAID CATHODE BODY PERIPHERALLY ON ONE SIDE THEREOF AND FORMING THEREWITH A RECEPTACLE CONTAINING AN EMISSIVE MATERIAL, A SECOND TUBULAR ELEMENT HAVING ONE END THEREOF CONNECTED TO THE PORTION OF SAID FIRST ELEMENT WHICH IS CONNECTED TO SAID CATHODE BODY PERIPHERALLY ON ONE SIDE THEREOF AND EXTENDING AXIALLY THEREFROM, THE SIDE OF SAID CATHODE WHICH FACES AXIALLY AWAY FROM SAID ELEMENTS BEING ENTIRELY EXPOSED AND FORMING THE EMITTING SURFACE, THE INSIDE WALL OF SAID TUBULAR SECOND ELEMENT SURROUNDING A PORTION OF THE OUTSIDE WALL OF SAID FIRST ELEMENT AND FORMING A CHAMBER THEREWITH, A HEATER FILAMENT DISPOSED WITHIN SAID CHAMBER IN SPACED RELATING TO EACH OF SAID ELEMENTS AND MEANS SEPARATE FROM SAID ELEMENTS FOR CONNECTING CURRENT TO SAID FILAMENT TO CAUSE IT TO GENERATE HEAT WITHIN SAID CHAMBER FOR TRANSFER SUBSTANTIALLY BY RADIATION THEREFROM RESPECTIVELY TO SAID FIRST AND SAID SECOND ELEMENTS SO AS TO HEAT SAID EMISSIVE MATERIAL AND SAID CATHODE BODY FOR THE PURPOSE OF CAUSING MIGRATION OF EMISSIVE MATERIAL FROM SAID RECEPTACLE THROUGH SAID CATHODE BODY TO THE EMITTING SURFACE FORMED THEREBY FOR EMISSION THEREFROM SUBSTANTIALLY OVER THE ENTIRE AREA OF SAID SURFACE, AND A GETTER SUBSTANCE DISPOSED ON THE SIDE OF THE WALL MEANS OF AT LEAST ONE OF SAID ELEMENTS WHICH FACES SAID HEATER FILAMENT.
US292434A 1951-06-14 1952-06-09 Dispenser type cathode having gettercoated parts Expired - Lifetime US2741717A (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2843777A (en) * 1954-01-28 1958-07-15 Rauland Corp Cathode-ray tubes
US2870364A (en) * 1955-11-21 1959-01-20 Machlett Lab Inc Electron discharge device
US2898501A (en) * 1956-08-13 1959-08-04 Machlett Lab Inc Getters for electron tubes
US2899592A (en) * 1953-11-18 1959-08-11 coppola
US2902620A (en) * 1953-03-04 1959-09-01 Egyesuelt Izzolampa Supply cathode
US2912611A (en) * 1953-08-14 1959-11-10 Int Standard Electric Corp Thermionic cathodes
US2951172A (en) * 1958-10-27 1960-08-30 Rca Corp High power, high frequency electron tube
US2951170A (en) * 1958-12-04 1960-08-30 Machlett Lab Inc Getter for electron tubes
US3100274A (en) * 1959-12-17 1963-08-06 Raytheon Co Electron tube with electrode having titanium surface serving as getter
US3160780A (en) * 1961-01-17 1964-12-08 Philips Corp Indirectly heated cathode
US3467879A (en) * 1966-03-08 1969-09-16 Philips Corp Planar dispenser cathode assembly with a cap member to which an electronemissive,tubular heater,and rodshaped support members are clamped
US3495116A (en) * 1965-06-30 1970-02-10 Siemens Ag Pump arrangement with auxiliary cathode for electrical discharge vessels
US3582702A (en) * 1968-04-04 1971-06-01 Philips Corp Thermionic electron-emissive electrode with a gas-binding material
US3747590A (en) * 1971-06-21 1973-07-24 Nat Cable Molding Corp Biopotential electrode
DE3708687A1 (en) * 1986-04-01 1987-10-08 Ceradyne Inc Dispenser cathode and process for their preparation
US20030025435A1 (en) * 1999-11-24 2003-02-06 Vancil Bernard K. Reservoir dispenser cathode and method of manufacture

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131204A (en) * 1936-01-15 1938-09-27 Siemens Ag Indirectly heated thermionic cathode
US2368060A (en) * 1942-01-01 1945-01-23 Bell Telephone Labor Inc Coating of electron discharge device parts
US2400345A (en) * 1945-02-10 1946-05-14 Gen Electric Electric discharge device
US2444158A (en) * 1944-07-31 1948-06-29 Fansteel Metallurgical Corp Thermionic device and getter elements therefor
US2449786A (en) * 1943-03-05 1948-09-21 Westinghouse Electric Corp Getter
US2509702A (en) * 1947-01-14 1950-05-30 Eureka Television And Tube Cor Cathode for thermionic valves
US2543728A (en) * 1947-11-26 1951-02-27 Hartford Nat Bank & Trust Co Incandescible cathode

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131204A (en) * 1936-01-15 1938-09-27 Siemens Ag Indirectly heated thermionic cathode
US2368060A (en) * 1942-01-01 1945-01-23 Bell Telephone Labor Inc Coating of electron discharge device parts
US2449786A (en) * 1943-03-05 1948-09-21 Westinghouse Electric Corp Getter
US2444158A (en) * 1944-07-31 1948-06-29 Fansteel Metallurgical Corp Thermionic device and getter elements therefor
US2400345A (en) * 1945-02-10 1946-05-14 Gen Electric Electric discharge device
US2509702A (en) * 1947-01-14 1950-05-30 Eureka Television And Tube Cor Cathode for thermionic valves
US2543728A (en) * 1947-11-26 1951-02-27 Hartford Nat Bank & Trust Co Incandescible cathode

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902620A (en) * 1953-03-04 1959-09-01 Egyesuelt Izzolampa Supply cathode
US2912611A (en) * 1953-08-14 1959-11-10 Int Standard Electric Corp Thermionic cathodes
US2899592A (en) * 1953-11-18 1959-08-11 coppola
US2843777A (en) * 1954-01-28 1958-07-15 Rauland Corp Cathode-ray tubes
US2870364A (en) * 1955-11-21 1959-01-20 Machlett Lab Inc Electron discharge device
US2898501A (en) * 1956-08-13 1959-08-04 Machlett Lab Inc Getters for electron tubes
US2951172A (en) * 1958-10-27 1960-08-30 Rca Corp High power, high frequency electron tube
US2951170A (en) * 1958-12-04 1960-08-30 Machlett Lab Inc Getter for electron tubes
US3100274A (en) * 1959-12-17 1963-08-06 Raytheon Co Electron tube with electrode having titanium surface serving as getter
US3160780A (en) * 1961-01-17 1964-12-08 Philips Corp Indirectly heated cathode
US3495116A (en) * 1965-06-30 1970-02-10 Siemens Ag Pump arrangement with auxiliary cathode for electrical discharge vessels
US3467879A (en) * 1966-03-08 1969-09-16 Philips Corp Planar dispenser cathode assembly with a cap member to which an electronemissive,tubular heater,and rodshaped support members are clamped
US3582702A (en) * 1968-04-04 1971-06-01 Philips Corp Thermionic electron-emissive electrode with a gas-binding material
US3747590A (en) * 1971-06-21 1973-07-24 Nat Cable Molding Corp Biopotential electrode
DE3708687A1 (en) * 1986-04-01 1987-10-08 Ceradyne Inc Dispenser cathode and process for their preparation
US20030025435A1 (en) * 1999-11-24 2003-02-06 Vancil Bernard K. Reservoir dispenser cathode and method of manufacture

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