US2870366A - Electric discharge tube of the kind comprising a cathode of the indirectly heated type - Google Patents

Electric discharge tube of the kind comprising a cathode of the indirectly heated type Download PDF

Info

Publication number
US2870366A
US2870366A US312592A US31259252A US2870366A US 2870366 A US2870366 A US 2870366A US 312592 A US312592 A US 312592A US 31259252 A US31259252 A US 31259252A US 2870366 A US2870366 A US 2870366A
Authority
US
United States
Prior art keywords
cathode
filament
indirectly heated
electric discharge
cylinder
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
US312592A
Other languages
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2870366A publication Critical patent/US2870366A/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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G45/00—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
    • C10G45/02—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing

Definitions

  • the invention relates to electric discharge tubes comprising an electrode system having an indirectly heated cathode, and in particular to those tubes suitable for use in circuit-arrangements in which a high potential is applied between an activated cathode sleeve and a heating filament.
  • Television circuit-arrangements often require that a high voltage difference of, for example, about 5000 v. exists between the filament and the cathode of tubes employing indirectly heated cathodes.
  • the main object of the invention is to provide an indirectly heated cathode with improved insulation between the filament and the activated cathode sleeve.
  • an extremely satisfactory insulation between the cathode sleeve and the filament wire may be obtained in an electric discharge tube comprising an electrode system having a cathode of the indirectly heated type by housing the filament body in an insulating cylinder which is supported by the cathode sleeve at given areas by re-entrant portions of the cath-' ode sleeve, these portions holding the insulating cylinder spaced apart from the cathode sleeve, and at the given areas the filament body is spaced from the inner side of the insulating cylinder.
  • the term filament body when used herein is to be understood to mean a filament wire coated or not coated with insulating material.
  • the insulating cylinder is clamped tight by three points pressed in the cathode sleeve at opposite ends of the cathode so that the cylinder is not in contact with the cathode sleeve at any other points.
  • the filament wire is arranged so that it does not engage the inner side of the cylinder at the areas where the re-entrant parts of the cathode sleeve are in contact with the outer side of the insulating cylinder.
  • This may be effected at the upper end of the cathode by providing a slightly shorter length of the filament body, and, in the case of a helical filament wire, at the lower end by causing the ends of the filament wire to extend straight beyond the cathode, or, in the case of an insulated filament wire consisting of straight portions, by removing the insulation of this wire at the level of the re-entrant parts over a certain length so that the uncovered wire is then spaced from the inner surface of the insulating cylinder.
  • Fig. 1 shows a discharge tube comprising an indirectly heated cathode according to the invention
  • Fig. 2 shows a modification of the tube shown in Fig. 1.
  • a bulb 1 encloses an electrode system comprising an anode 2 and an indirectly heated cathode assembly.
  • the cathode comprises a metal sleeve 3 coated with an electron emissive material and having a plurality of re-entrant parts 4 at each end. These re-entrant parts 4 support an insulating cylinder 5 spaced apart by a certain distance from the cathode sleeve 3.
  • Fig. 2 shows a similar tube to that shown in Fig. 1 comprising, however, a V-shaped filament body 7, the top of which lies below upper re-entrant parts 8 of a cathode sleeve 9.
  • the limbs of the filament body 7 are freed from insulating material along a certain length at the level of the lower re-entrant parts 8, and, therefore, are clear from the inner wall of an insulating cylinder 10.
  • the diameter of the cathode is 3.0 mms. and the spacing between the insulating cylinder and the cathode sleeve is 0.1 to 0.2 mm.
  • the wall thickness of the insulating cylinder is 0.38 mm. and the insulating material thereof is made of magnesia.
  • another insulating material for example quartz or ceramic material may be used.
  • An electric discharge device comprising an indirectly heated cathode assembly capable of withstanding high voltages, said cathode assembly comprising a heating filament, an electrically insulating cylinder enclosing and supporting said filament at at least one point, and an activated cathode sleeve enclosing said cylinder and substantially spaced therefrom, said cathode sleeve having re-entrant portions in engagement with said cylinder only at points at which the filament is spaced from said cylinder for supporting said cathode sleeve.
  • An electric discharge device comprising an indirectly heated cathode assembly capable of withstanding high voltages, said cathode assembly comprising an electrically insulated heating filament, an electrically insulating cylinder enclosing and supporting said filament at a plurality of points, and an activated cathode sleeve enclosing said cylinder and substantially spaced therefrom, said cathode sleeve having re-entrant portions in engagement with said cylinder only at a few given points at which the filament is spaced from said cylinder for supporting said cathode sleeve.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Solid Thermionic Cathode (AREA)
US312592A 1951-10-13 1952-10-01 Electric discharge tube of the kind comprising a cathode of the indirectly heated type Expired - Lifetime US2870366A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL715794X 1951-10-13

Publications (1)

Publication Number Publication Date
US2870366A true US2870366A (en) 1959-01-20

Family

ID=19814946

Family Applications (1)

Application Number Title Priority Date Filing Date
US312592A Expired - Lifetime US2870366A (en) 1951-10-13 1952-10-01 Electric discharge tube of the kind comprising a cathode of the indirectly heated type

Country Status (6)

Country Link
US (1) US2870366A (it)
BE (1) BE514709A (it)
DE (1) DE927521C (it)
FR (1) FR1064299A (it)
GB (1) GB715794A (it)
NL (1) NL84125C (it)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973449A (en) * 1957-10-23 1961-02-28 Philips Corp Electric discharge tube
US3214628A (en) * 1962-06-11 1965-10-26 Rca Corp Cathode assembly for electron tube
US3214627A (en) * 1961-02-24 1965-10-26 Tokyo Shibaura Electric Co Rapid-start cathode-ray tubes
US3287080A (en) * 1963-06-27 1966-11-22 Rca Corp Electron tube mount and method of making the same
US3495121A (en) * 1967-04-10 1970-02-10 Siemens Ag Indirectly heated dispenser cathode for electrical discharge vessels
US3652894A (en) * 1969-07-01 1972-03-28 Licentia Gmbh Indirectly heated hot-cathodes with pink ruby insulator
US3767958A (en) * 1971-12-23 1973-10-23 Gte Sylvania Inc Electron discharge device having increased heater-cathode breakdown voltage
US3883765A (en) * 1972-06-02 1975-05-13 Commissariat Energie Atomique High-performance emitter for thermoelectronic diodes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973812C (de) * 1954-01-20 1960-06-15 Siemens Ag Mittelbar geheizte Kathode fuer elektrische Entladungsgefaesse mit einer rohrfoermig ausgebildeten Kathodenhuelse
BE572249A (it) * 1957-10-23
JPS58100329A (ja) * 1981-12-11 1983-06-15 Toshiba Corp 電子管用陰極構体

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1870968A (en) * 1928-05-21 1932-08-09 Westinghouse Lamp Co Heater element
US1974448A (en) * 1930-04-05 1934-09-25 Henry L Crowley & Co Inc Indirectly heated cathode and insulator assembly
US1982885A (en) * 1932-04-02 1934-12-04 Stupakoff Lab Inc Insulator and cathode embodying the same
US2079057A (en) * 1931-06-01 1937-05-04 Raytheon Production Corp Thermionic cathode
US2081415A (en) * 1934-09-05 1937-05-25 Bell Telephone Labor Inc Electron emitter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1870968A (en) * 1928-05-21 1932-08-09 Westinghouse Lamp Co Heater element
US1974448A (en) * 1930-04-05 1934-09-25 Henry L Crowley & Co Inc Indirectly heated cathode and insulator assembly
US2079057A (en) * 1931-06-01 1937-05-04 Raytheon Production Corp Thermionic cathode
US1982885A (en) * 1932-04-02 1934-12-04 Stupakoff Lab Inc Insulator and cathode embodying the same
US2081415A (en) * 1934-09-05 1937-05-25 Bell Telephone Labor Inc Electron emitter

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973449A (en) * 1957-10-23 1961-02-28 Philips Corp Electric discharge tube
US3214627A (en) * 1961-02-24 1965-10-26 Tokyo Shibaura Electric Co Rapid-start cathode-ray tubes
US3214628A (en) * 1962-06-11 1965-10-26 Rca Corp Cathode assembly for electron tube
DE1212224B (de) * 1962-06-11 1966-03-10 Rca Corp Verfahren zum Herstellen einer indirekt geheizten Kathode fuer eine Elektronenroehre
US3287080A (en) * 1963-06-27 1966-11-22 Rca Corp Electron tube mount and method of making the same
US3495121A (en) * 1967-04-10 1970-02-10 Siemens Ag Indirectly heated dispenser cathode for electrical discharge vessels
US3652894A (en) * 1969-07-01 1972-03-28 Licentia Gmbh Indirectly heated hot-cathodes with pink ruby insulator
US3767958A (en) * 1971-12-23 1973-10-23 Gte Sylvania Inc Electron discharge device having increased heater-cathode breakdown voltage
US3883765A (en) * 1972-06-02 1975-05-13 Commissariat Energie Atomique High-performance emitter for thermoelectronic diodes

Also Published As

Publication number Publication date
FR1064299A (fr) 1954-05-12
DE927521C (de) 1955-05-09
NL84125C (it)
GB715794A (en) 1954-09-22
BE514709A (it)

Similar Documents

Publication Publication Date Title
US2870366A (en) Electric discharge tube of the kind comprising a cathode of the indirectly heated type
US2280980A (en) Electron discharge device
US2201720A (en) Thermionic cathode structure
US2177703A (en) Electric gaseous discharge device
US2277148A (en) Electrode for electron discharge devices
US2435246A (en) Gaseous discharge device containing perforated starting electrodes
US2489872A (en) Envelope and electrode mounting structure for electric discharge devices
US2081415A (en) Electron emitter
US2310936A (en) Electron discharge apparatus
US2688707A (en) Electron tube structure
US1899568A (en) Cathode structure for vacuum tubes
US1989786A (en) Base and based electric device
US2825832A (en) Thermionic cathode structure
US2367579A (en) Gaseous conduction discharge device
US1975870A (en) Indirectly heated cathode
US2725497A (en) Floating grids for fluorescent lamps
US2381632A (en) Electron discharge device
US2880351A (en) Vacuum discharge tube
US2431337A (en) Electron discharge device for high frequency
US1915934A (en) Glow discharge tube
US2939030A (en) Getters for electron tubes
US2956194A (en) Electron tube for the optical indication of an electrical magnitude
US2121615A (en) Gas or vapor filled discharge device
US2404413A (en) Electrical gaseous discharge device
US1931874A (en) Electron discharge device