US2609518A - Electron discharge tube having a disk-shaped cathode - Google Patents

Electron discharge tube having a disk-shaped cathode Download PDF

Info

Publication number
US2609518A
US2609518A US55445A US5544548A US2609518A US 2609518 A US2609518 A US 2609518A US 55445 A US55445 A US 55445A US 5544548 A US5544548 A US 5544548A US 2609518 A US2609518 A US 2609518A
Authority
US
United States
Prior art keywords
cathode
electrode
discharge tube
disk
electron discharge
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
US55445A
Other languages
English (en)
Inventor
Klopping Carel Peter
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
Original Assignee
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 US2609518A publication Critical patent/US2609518A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/36—Tubes with flat electrodes, e.g. disc electrode

Definitions

  • the invention relates to an electric discharge tube comprising so-called disc-shaped and usually flat electrodesand to a method of manufacturing such a tube, more particularly of correctly spacingthe cathode away fromthe next-following electrode. 4
  • the cathode is then removed again from the said electrode with the use of a micrometer screw device until the desired spacing is reached and then tightly secured in position.
  • These operations are ef- 1 dam. (c1. sue-mo) fected after all the glass sealsjof the tube are completed so that, once the cathodeis adjusted, they can no longer aifect this adjustment;
  • a cathode as: described in U. S, application Serial No. 42,268 filed August 3, 1948, in which the disc-shaped emissive part of the cathode is secured to a cylinder preferably made of perforatedmetal, said cylinder' bein'g adapted to move with some friction in'a metal tube sealed in the tube wall.
  • the metal cylinder is secured in the sealed-in tube and soldered to it in a vacuumtight manner. Since the thickness of the emissive layer and that of the bare wire on the cathode surface embedded in this layer are known, the correct spacing between the emissive layer and the next-following electrode may be adjusted with the use of the micrometer screw.
  • This next-following electrode may be an anode, but also a grid consisting of fine wires. Since the instant of engagement of the bare wire with this electrode is indicated by the passage of current due to the contact between wire and electrode, this instant may be ascertained without the need of exerting any pressure on the said electrode and hence difficulties due to resilient deformations need not be feared.
  • FIG. 1 shows one arrangement of cathode and anode of a diode system
  • Fig. 2 denotes the instant of contact between these electrodes and Fig. 3 is a cross-sectional view of a discharge tube in accordance with the invention.
  • I designates the cathode proper, which is arranged opposite an electrode 2, in this case the anode of a diode system, at a distance of, say, microns or less.
  • the cathode l is secured to a cylinder 3 and has its surface 4 coated with emissive material.
  • the emissive layer has a thickness of, say, 20 microns.
  • Secured to the upper surface is a bare wire 5 thirty microns in diameter, which thus extends by 10 microns beyond the emissive layer. After the emissive layer has been applied, the upper surface of the bare wire may, if necessary, be freed from emissive material by scratching.
  • cathode l is first moved towards the anode 2 till the bare wire '5 just contacts with this anode, which may be ascertained by the establishment of an electric contact, with the result that a circuit is closed through a measuring instrument 6 and a battery I.
  • the cathode is then moved back by, say, 40 microns, so that a spacing of 50 microns between emissive layer and anode is obtained.
  • soldering the cylinder 3 in positiomit is made sure that the adjusted spacing remains unaltered. In the case of even'smaller spacings the thermal expansion of cathode and anode will have to be allowed for.
  • the discharge tube shown in Fig.3 comprises a cathode I having a spacing conductor 5 arranged on the surface thereof and having a thickness greater than the thickness of the emissive layer 4. Positioned adjacent the cathode with precision spacing is a grid 2 andpremote.
  • anode iii from the cathode is an anode iii.
  • the respective elements are secured together byinsulating spacers ll, 8 and 9 which also form part of the tube envelope.
  • An electron discharge tube comprising a, discshaped cathode, a second electrode in spaced relationship to said cathode, an emissive layer of given thickness positioned on a portion of said cathode facing said second electrode, and a bare conductor member positioned on a second portion of said cathode surface free of emitting material and extending diametrically thereacross, said conductor and having a thickness greater than-said given thickness and less than the spacing between said cathode and said second electrode.

Landscapes

  • Microwave Tubes (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Primary Cells (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US55445A 1947-11-15 1948-10-20 Electron discharge tube having a disk-shaped cathode Expired - Lifetime US2609518A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL72044X 1947-11-15

Publications (1)

Publication Number Publication Date
US2609518A true US2609518A (en) 1952-09-02

Family

ID=19757396

Family Applications (1)

Application Number Title Priority Date Filing Date
US55445A Expired - Lifetime US2609518A (en) 1947-11-15 1948-10-20 Electron discharge tube having a disk-shaped cathode

Country Status (6)

Country Link
US (1) US2609518A (da)
CH (1) CH273524A (da)
DE (1) DE818381C (da)
DK (1) DK72044C (da)
FR (1) FR974849A (da)
GB (1) GB648046A (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2859371A (en) * 1954-04-09 1958-11-04 Gen Electric Electron discharge device structure
US3050651A (en) * 1956-09-04 1962-08-21 Gen Electric High temperature electron discharge device and apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2174853A (en) * 1937-08-26 1939-10-03 Hygrade Sylvania Corp Electron gun structure and method of assembly thereof
US2225465A (en) * 1938-11-18 1940-12-17 Lorenz C Ag Electron discharge device
US2227017A (en) * 1936-03-12 1940-12-31 Loewe Radio Inc Hot cathode for cathode ray tubes
US2411184A (en) * 1942-07-02 1946-11-19 Gen Electric Fabrication of discharge devices
US2446765A (en) * 1946-09-24 1948-08-10 Gen Electric Electrical discharge tube
US2458693A (en) * 1946-01-25 1949-01-11 Eitel Mccullough Inc Electron tube

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2227017A (en) * 1936-03-12 1940-12-31 Loewe Radio Inc Hot cathode for cathode ray tubes
US2174853A (en) * 1937-08-26 1939-10-03 Hygrade Sylvania Corp Electron gun structure and method of assembly thereof
US2225465A (en) * 1938-11-18 1940-12-17 Lorenz C Ag Electron discharge device
US2411184A (en) * 1942-07-02 1946-11-19 Gen Electric Fabrication of discharge devices
US2458693A (en) * 1946-01-25 1949-01-11 Eitel Mccullough Inc Electron tube
US2446765A (en) * 1946-09-24 1948-08-10 Gen Electric Electrical discharge tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2859371A (en) * 1954-04-09 1958-11-04 Gen Electric Electron discharge device structure
US3050651A (en) * 1956-09-04 1962-08-21 Gen Electric High temperature electron discharge device and apparatus

Also Published As

Publication number Publication date
CH273524A (de) 1951-02-15
DK72044C (da) 1951-01-22
GB648046A (en) 1950-12-28
DE818381C (de) 1952-03-27
FR974849A (fr) 1951-02-26

Similar Documents

Publication Publication Date Title
US2462921A (en) Electron discharge tube
US2455381A (en) Cathode assembly for electron discharge devices
US2527127A (en) Electronic discharge device
US2564040A (en) Glow discharge voltage control device
US2609518A (en) Electron discharge tube having a disk-shaped cathode
US3694260A (en) Bonded heater,cathode,control electrode structure and method of manufacture
US3319102A (en) Electron gun assembly with increased cooling surfaces
US3599031A (en) Bonded heater, cathode, control electrode structure
US2859372A (en) Electron tube
US2556864A (en) Coated grid for electron discharge tubes
US2750560A (en) Electron discharge tube
US2760100A (en) Electric discharge tube
US2421192A (en) Multicathode phototube
US2889481A (en) Gaseous discharge devices
US2699517A (en) Electric discharge tube with planar electrodes
US2652510A (en) Gas discharge device
US2784337A (en) Electron discharge device
US3299309A (en) Annular cathode electrode support
US2523779A (en) Ionization gauge
US2716199A (en) Electric discharge tube for short waves
US3254256A (en) Ionization vacuum gauge having an emissive electrode support means
US3283195A (en) Cold-cathode glow-discharge tube
US2532846A (en) Manufacture of electron discharge tubes
US2699516A (en) Electron discharge device having diskshaped electrode supports
US2583029A (en) Method of preparing glow discharge devices