US3086136A - Electric discharge tube having heat flow cathode centering member - Google Patents

Electric discharge tube having heat flow cathode centering member Download PDF

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Publication number
US3086136A
US3086136A US15614A US1561460A US3086136A US 3086136 A US3086136 A US 3086136A US 15614 A US15614 A US 15614A US 1561460 A US1561460 A US 1561460A US 3086136 A US3086136 A US 3086136A
Authority
US
United States
Prior art keywords
cathode
centering member
electric discharge
discharge tube
insulator
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
US15614A
Other languages
English (en)
Inventor
Almer Friedrich Herman Raymund
Almer Raymund
Fennema Jan
Kuiper Adrianus
Santing Hendrik
Jan Anton Van Veldhuizen
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 US3086136A publication Critical patent/US3086136A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • 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
    • H01J1/88—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H01J1/94—Mountings for individual electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H01J19/50—Spacing members extending to the envelope
    • H01J19/52—Spacing members extending to the envelope without fixed connection between spacing member and envelope
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/74—Cooling arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0002—Construction arrangements of electrode systems
    • H01J2893/0005—Fixing of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0002—Construction arrangements of electrode systems
    • H01J2893/0005—Fixing of electrodes
    • H01J2893/0009—Electrode system pressing against vessel wall

Definitions

  • This invention relates to electric discharge tubes having thermionic cathodes which are centered and supported in the tube by means of at' least one preferably plate-shaped insulating member.
  • the present invention is based on the recognition that the large differences in heat dissipation are due to the fact that there is a highly variable thermal contact between the cathode and the insulator engaging it so that large variations in the heat dissipation are produced.
  • the temperature of the part of the insulator engaging the cathode becomes comparatively high so that there is only a comparatively slight difference between the cathode temperature and the insulator temperature at the points of contact. Differences in the heat transfer at these points consequently have a relatively smaller influence upon the heat dissipation of the cathode.
  • the heat dissipation of the hot parts of the insulator to the remaining part of this insulator can be accurately determined and hence kept constant for the various specimens owing to the fact that this transfer is effected through stationary parts of the insulator.
  • These stationary parts may comprise connecting strips produced by aperturing a plate-shaped insulator. It is desirable for the heat dissipation through these strips to be reduced to a minimum, however, in any case, this heat dissipation always is substantially equal for equal insulating members.
  • the cathode to be in highly heatconducting connection with the insulator so that at this point the abrupt thermal variation is small and hence variations in this connection exert a lesser influence upon the cathode temperature.
  • FIG. 1 is a plan view of an electrode system of a tube in accordance with the invention.
  • H6. 2 shows an alternative embodiment
  • reference numeral 1 denotes a tube envelope and 2 a cathode; grid stay rods are designated 3' and bent-over lugs securing the anode to a mica member 5 are designated 4.
  • Parts 6 of the mica centering member 5 are in good thermal contact with the cathode, but are connected to the remaining part of the plate 5 by narrow strips 7 only. Since the heat dissipation through the parts 7 can be much smaller than that from the cathode to the parts 6, the parts 6 will assume a high temperature and differences in heat dissipation from the cathode 2 to the parts 6 will have a smaller influence on the total heat dissipation, since this is determined by the parts 7 and can be accurately equal for all the mica members.
  • the thermal contact between the cathode and the mica member can fluctuate widely since the cathode must not be gripped in the aperture of the mica plate too firmly. Small variations of the sizes of the cathode cross-section and of the mica aperture can give rise to large diiferences in the thermal contact.
  • FIG. 2 use is made of a separate mica plate 10 which serves in particular for centering the cathode 2 and the grid stay rod 3.
  • the parts 6 of the mica plate can assume a high temperature.
  • the grid is centered with respect to the anode 4 and the tube wall 1 by means of a mica member 5 which, however, does not engage the cathode.
  • An electric discharge tube comprising at least one electrode including a thermionic cathode, an electrode centering member of insulating material having a first portion engaging the cathode and a second portion in contact with a cooler portion of the tube, said centering member having a portion intermediate the first and second portions thereof which has a smaller sectional area than that of the first and second portions whereby the transfer of heat from the first portion to the second portion is retarded and the temperature difference between said first portion and the cathode is minimized.

Landscapes

  • Electron Sources, Ion Sources (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Lasers (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US15614A 1959-04-01 1960-03-17 Electric discharge tube having heat flow cathode centering member Expired - Lifetime US3086136A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL237696 1959-04-01

Publications (1)

Publication Number Publication Date
US3086136A true US3086136A (en) 1963-04-16

Family

ID=19751647

Family Applications (1)

Application Number Title Priority Date Filing Date
US15614A Expired - Lifetime US3086136A (en) 1959-04-01 1960-03-17 Electric discharge tube having heat flow cathode centering member

Country Status (8)

Country Link
US (1) US3086136A (de)
AT (1) AT218140B (de)
BE (1) BE589228A (de)
CH (1) CH389788A (de)
DE (1) DE1100180B (de)
DK (1) DK98973C (de)
ES (1) ES256919A1 (de)
GB (1) GB936955A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215880A (en) * 1961-04-14 1965-11-02 Gen Electric Electron gun electrode assembly
US4119882A (en) * 1977-02-22 1978-10-10 Rca Corporation Cathode for flat panel display

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1967208A (en) * 1931-04-25 1934-07-17 Arcturus Dev Company Electron discharge device
US2907912A (en) * 1955-04-29 1959-10-06 Gen Electric Electron discharge device
US2917652A (en) * 1956-09-17 1959-12-15 Philips Corp Electrical discharge tube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE693697C (de) * 1934-08-13 1940-07-17 Philips Patentverwaltung Indirekt geheizte Kathode fuer elektrische Entladungsroehren
DE717643C (de) * 1935-04-01 1942-02-19 Aeg Mittelbar geheizte, an der Kathodenhuelse gehalterte Kathode fuer elektrische Entladungsgefaesse und Verfahren zu ihrer Herstellung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1967208A (en) * 1931-04-25 1934-07-17 Arcturus Dev Company Electron discharge device
US2907912A (en) * 1955-04-29 1959-10-06 Gen Electric Electron discharge device
US2917652A (en) * 1956-09-17 1959-12-15 Philips Corp Electrical discharge tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215880A (en) * 1961-04-14 1965-11-02 Gen Electric Electron gun electrode assembly
US4119882A (en) * 1977-02-22 1978-10-10 Rca Corporation Cathode for flat panel display

Also Published As

Publication number Publication date
DK98973C (da) 1964-06-08
AT218140B (de) 1961-11-10
CH389788A (de) 1965-03-31
GB936955A (en) 1963-09-18
BE589228A (fr) 1960-08-30
DE1100180B (de) 1961-02-23
ES256919A1 (es) 1960-06-01

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