US3727278A - Method of adjusting two electrode surfaces in an electric discharge tube at a given distance from each other - Google Patents

Method of adjusting two electrode surfaces in an electric discharge tube at a given distance from each other Download PDF

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Publication number
US3727278A
US3727278A US00146108A US3727278DA US3727278A US 3727278 A US3727278 A US 3727278A US 00146108 A US00146108 A US 00146108A US 3727278D A US3727278D A US 3727278DA US 3727278 A US3727278 A US 3727278A
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US
United States
Prior art keywords
electrodes
supporting members
given distance
layer
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
US00146108A
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English (en)
Inventor
Esdonk J Van
Roosmalen J Van
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
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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 US3727278A publication Critical patent/US3727278A/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
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • 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
    • 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
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • 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
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0023—Manufacture carbonising and other surface treatments

Definitions

  • ABSTRACT A method of adjusting two metallic electrodes surfaces in an electric discharge tube at a given distance from each other in which an intermediate layer of non-metallic material, e.g. carbon or a metal oxide, is provided between the surfaces of the electrodes which are placed in abutting relationship.
  • the electrodes are then heated to a temperature of about 780C to connect them with supporting members and cooled. Due to different coefficients of expansion of the electrodes and supporting members, the electrodes separate and the intermediate layer is then removed.
  • the invention relates to a method of adjusting two metallic electrode surfaces in an electric discharge tube at a given distance from each other, in which said surfaces are arranged against each other and are heated together with their supporting members to above the operating temperature and connected to said members, after which the desirable distance is obtained by the difference in expansion between the electrode and the supporting members, after cooling to the operating temperature.
  • the invention furthermore relates to an electric discharge tube, in particular a camera tube, comprising at least two electrodes the mutual distance between the surface of which has been adjusted by means of said method.
  • the layer preferably consists of carbon which is provided on one of the electrode surfaces in the form of soot or graphite as a very thin layer in a thickness of less than l,/L.
  • the layer may also consists of particles or grains consisting ofa metal oxide which can be provided on the surface in a suitable manner, for example by cataphoresis, as a fume or by sputtering in an oxidizing atmosphere.
  • this material must afterwards be removed from between the electrode surfaces, and this may be carried out by means of ultrasonic vibrations in or by rinsing with a suitable liquid, for example, water, or a suitable hydrocarbon compound, which does not attack the material of the electrodes or of the supporting members and does not leave any residues after drying.
  • FIG. 1 is a longitudinal cross-sectional view of two electrodes prior to heating
  • FIG. 2 is a longitudinal cross-sectional view of the electrodes as they can be incorporated in a discharge tube.
  • Reference numeral 1 in FIG. I denotes a control electrode
  • 2 is an anode of an electron gun of a camera tube.
  • moulded or compressed annular parts 3 having an upright edge are secured on the outersurface of the electrodes.
  • the rings 3 may also be replaced, however, by angle pieces.
  • the upright edge of each ring 3 comprises three apertures through which supporting members of insulating material in the form of ceramic rods 4 are slid.
  • Each rod 4 is metallized at its ends.
  • soldering material 9 is provided on the metallisation 5 of the rods 4, for example, as rings or as a paste.
  • Plates 6 and 7 are secured to the electrodes 1 arid 2, for example by welding or soldering. The plates 6 and 7 constitute the active electrode surface and must be arranged at a mutual distance of approximately 10 p. at the operating temperature and be connected to the supporting members 4.
  • the outer surface of the plate 6 is covered with a thin granular layer 8 of carbon.
  • This carbon layer 8 has a thickness of less than 1 p. and must not constitute a solid closed layer, but consist of separate particles which can be removed afterwards.
  • the electrodes 1 and 2 are placed in a jig with their surfaces 6 and 7 against each other and are heated at 780C. At this temperature the soldering material 9 melts so that the electrodes are connected to the sup-:
  • soldering material 9 solidifies already at a slight temperature drop.
  • the metal electrode 2 Since the metal electrode 2 has a much larger thermal expansion than the ceramic rods 4, the electrodes 6 and 7 will be slightly spaced apart. at room temperature. This distance is larger than the desirable distance at the operating temperature.
  • the surfaces 6 and 7 of the electrodes are at a distance, for example, of 2(1) u.
  • the intermediate layer 8 is then removed by means of ultrasonic vibrations in or by rinsing with a suitable liquid, for example, water or a hydrocarbon compound, for example hexane, which dries up without leaving residues.
  • inventions may also be applied to other embodiments of metal electrodes and supporting members.
  • the invention is of particular importance if the metal parts facing each other have a very small wall thickness.

Landscapes

  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Ceramic Products (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Electrolytic Production Of Metals (AREA)
US00146108A 1970-06-25 1971-05-24 Method of adjusting two electrode surfaces in an electric discharge tube at a given distance from each other Expired - Lifetime US3727278A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7009324A NL7009324A (enrdf_load_stackoverflow) 1970-06-25 1970-06-25

Publications (1)

Publication Number Publication Date
US3727278A true US3727278A (en) 1973-04-17

Family

ID=19810417

Family Applications (1)

Application Number Title Priority Date Filing Date
US00146108A Expired - Lifetime US3727278A (en) 1970-06-25 1971-05-24 Method of adjusting two electrode surfaces in an electric discharge tube at a given distance from each other

Country Status (6)

Country Link
US (1) US3727278A (enrdf_load_stackoverflow)
CA (1) CA937975A (enrdf_load_stackoverflow)
DE (1) DE2126964A1 (enrdf_load_stackoverflow)
FR (1) FR2099875A5 (enrdf_load_stackoverflow)
GB (1) GB1314949A (enrdf_load_stackoverflow)
NL (1) NL7009324A (enrdf_load_stackoverflow)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2992480A (en) * 1956-12-14 1961-07-18 Raytheon Co Method for bonding laminations
US3279029A (en) * 1963-12-17 1966-10-18 Rca Corp Method of spacing electron tube elements
US3298083A (en) * 1964-01-02 1967-01-17 Rca Corp Method of making electron gun mount
US3643299A (en) * 1969-06-16 1972-02-22 Rca Corp Electron beam tube and method of adjusting the electrode spacing of an electron gun therein

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2992480A (en) * 1956-12-14 1961-07-18 Raytheon Co Method for bonding laminations
US3279029A (en) * 1963-12-17 1966-10-18 Rca Corp Method of spacing electron tube elements
US3298083A (en) * 1964-01-02 1967-01-17 Rca Corp Method of making electron gun mount
US3643299A (en) * 1969-06-16 1972-02-22 Rca Corp Electron beam tube and method of adjusting the electrode spacing of an electron gun therein

Also Published As

Publication number Publication date
DE2126964A1 (de) 1971-12-30
GB1314949A (en) 1973-04-26
FR2099875A5 (enrdf_load_stackoverflow) 1972-03-17
CA937975A (en) 1973-12-04
NL7009324A (enrdf_load_stackoverflow) 1971-12-28

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