US2465732A - Electric discharge tube - Google Patents

Electric discharge tube Download PDF

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Publication number
US2465732A
US2465732A US641301A US64130146A US2465732A US 2465732 A US2465732 A US 2465732A US 641301 A US641301 A US 641301A US 64130146 A US64130146 A US 64130146A US 2465732 A US2465732 A US 2465732A
Authority
US
United States
Prior art keywords
rods
electrode
discharge tube
bushes
electric 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
US641301A
Other languages
English (en)
Inventor
Lems Hendrik
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 US2465732A publication Critical patent/US2465732A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H01J19/46—Mountings for the electrode assembly as a whole
    • 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
    • H01J2893/0006—Mounting

Definitions

  • the present invention relates to electric discharge tubes such as amplifying tubes, electron beam tubes, multiplicator tubes, rectifying tubes and to on and provides an expedient for fixing internal parts of such tubes relatively to a support.
  • an insulating adhesive consisting of an inorganic, thermo-lplastic substance.
  • the paste is replaced by a suitable thermo-plastic adhesive the said drawbacks are obviated. It will be appreciated that solely those materials can be used whose properties, such as the softening temperature, stability in vacuo, freedom from gases, permit the use in the exhausted discharge space. For this reason glass and enamel are particularly suitable.
  • the adhesives used according to the invention have the advantage that they can be made so soft by controlling the temperature as is desirable in view of the spot where they must be provided.
  • Narrow slits may be filled with them into which a paste can be introduced only with difliculty.
  • tubes wherein interna1 parts such as electrodes and shields, are secured to rods which are passed through apertures made in the object to be secured to the rods.
  • This construction is found especially in electron beam tubes. In this case it is difficult to establish such a joint that there does not occur displacements along the rod even in the case of shocks.
  • the adhesive used according to the invention may be used with advantage.
  • the rods are provided with some amount of play in the holes and the adhesive is provided in the space between the rod and the wall of the aperture in such manner that it adheres both to the rod and to the wall and a firm joint is obtained.
  • the electrodes may be secured to the rods by means of bushes that are secured to disc-shaped parts of the object to be secured and embrace the 2 rods.
  • bushes that are secured to disc-shaped parts of the object to be secured and embrace the 2 rods.
  • Adhesives hardening upon drying in the air have the advantage ofbeing kneadable at the moment at which theyare provided.
  • this advantage can be conserved when using for the adhesive a pasty mass containing glasspowder and a mixingliquid.
  • This liquid for which alcohol or, if required, water may be used disappears upon heating, but the softness remains, since the powder grains are united with eachotherto form a ltiorno'geziccus plastic mass, and even passes over into the state of being thinly liquid at asuflicient temperature.
  • the softness is controlled in such manner that the adhesive spreads over the surface of ad herence without-escaping whereupon the mass is allowed to cool and harden;
  • Fig. 1 is a perspective view of an electrode for an electron beam tube, which is secured to four rods;
  • Fig. 2 is a section of a part of this electrode.
  • Figure 3 illustrates partly in cross-section a tube embodying the electrode structure according to the invention.
  • the electrode a Wehnelt cylinder l closed by a stop 2
  • the electrode is equipped with two cross-shaped fastening plates 3 and 4.
  • rods 5, B, l and 8 which may consist of hard glass, steatite or another suitable insulating material.
  • metal bushes I0 having tabs l I are secured to the plates 3 and 4 and embrace the rods 5, 6, l and 8 with a small amount of play.
  • the sequence of attachment may be altered at will.
  • the closed bushes I0 may first be welded to the plates followed by slipping the rods through them or the plates may first be slipped on the rods followed by bending the bushes around the rods. If desired, the bushes may first be closed and subsequently be welded to the plates or conversely.
  • the bushes l and the plates 3 and 4 surround the rods with a fair amount of play. If the bushes are tightly clamped on the rods the electrodes might readily be slightly displaced which must be prevented. When some space is left the electrodes may be very exactly positioned relatively to each other by means of a templet and when the rods fit exactly in the holes no modification is possible. When the electrodes are provided on the templet the whole is easily slipped on the rods and after the bushes have been closed and secured to the plates 3 and 4, unless this has already been done before, the intermediate spaces are filled with glass or enamel, for instance lead borate glass which has a low softening point and is thinly liquid at a comparatively low temperature.
  • This glass is provided in form of a pasty mass consisting of moist glass powder on the edge of the bush and that of the plate 1. e. at the points indicated by arrows in Fig. 2.
  • a gas flame or the like the plates and the bushes are heated.
  • the heat is transmitted to the pasty filling material, expels the mixing liquid and causes the glass parts to fiow together to form a homogeneous mass.
  • the temperature is sufiiciently raised the mass becomes thinly liquid so that it penetrates into the intermediate space l2 and fills it completely.
  • the mass can be prevented from flowing or dripping down.
  • the tube shown in Figure 3 comprises within an envelope 20 an electrode assembly 2
  • a discharge tube comprising an envelope, an electrode within said envelope, a supporting rod for said electrode within said envelope, said electrode having a portion which embraces said supporting rod, and a thermo-plastic insulating material bonding said supporting member and said electrode in fixed insulated relationship.
  • a discharge tube comprising an envelope, an electrode within said envelope having an apertured portion, a rod-like member extending into said aperture in spaced relationship to said electrode, and an insulating inorganic thermo-plastic adhesive material substantially filling the space in said aperture between said member and said electrode, said material adhesively bonding said member and said electrode in fixed relationship.
  • An electric discharge tube comprising an envelope, an electrode within said envelope, a bushing having a tubular portion joined to said electrode, a rod-like member extending through said tubular portion and in spaced relationship therewith, an insulating inorganic thermo-plastic adhesive material bonding said bushing and said portion in fixed relationship and substantially filling the space between said rod-like member and said tubular portion through which said member extends.

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  • Gas-Filled Discharge Tubes (AREA)
US641301A 1942-03-14 1946-01-15 Electric discharge tube Expired - Lifetime US2465732A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL234242X 1942-03-14

Publications (1)

Publication Number Publication Date
US2465732A true US2465732A (en) 1949-03-29

Family

ID=19780162

Family Applications (1)

Application Number Title Priority Date Filing Date
US641301A Expired - Lifetime US2465732A (en) 1942-03-14 1946-01-15 Electric discharge tube

Country Status (2)

Country Link
US (1) US2465732A (de)
CH (1) CH234242A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525737A (en) * 1948-04-14 1950-10-10 Rca Corp Plate support
DE1009317B (de) * 1951-11-26 1957-05-29 Philips Nv Elektrische Entladungsroehre

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1427870A (en) * 1918-06-15 1922-09-05 Gen Electric Hermetical seal
US1775218A (en) * 1924-04-10 1930-09-09 Thurneyssen Guy Theodore Joint and connection
US2036652A (en) * 1935-04-02 1936-04-07 Rca Corp Lead-in bushing
US2056035A (en) * 1934-09-01 1936-09-29 Gen Electric Electrode structure for metal tubes
US2138660A (en) * 1934-10-24 1938-11-29 Gen Motors Corp Refrigerating apparatus
US2153404A (en) * 1934-04-19 1939-04-04 Gen Electric Method of making stems for sealed electrical devices
US2193640A (en) * 1938-05-21 1940-03-12 Gen Electric Glass-to-metal seal
US2200694A (en) * 1937-09-21 1940-05-14 Pintsch Julius Kg Annular fusion joint
US2202607A (en) * 1936-08-21 1940-05-28 Allegemeine Elek Citatz Ges Electrode mounting
US2296579A (en) * 1940-11-30 1942-09-22 Rca Corp Glass envelope seal

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1427870A (en) * 1918-06-15 1922-09-05 Gen Electric Hermetical seal
US1775218A (en) * 1924-04-10 1930-09-09 Thurneyssen Guy Theodore Joint and connection
US2153404A (en) * 1934-04-19 1939-04-04 Gen Electric Method of making stems for sealed electrical devices
US2056035A (en) * 1934-09-01 1936-09-29 Gen Electric Electrode structure for metal tubes
US2138660A (en) * 1934-10-24 1938-11-29 Gen Motors Corp Refrigerating apparatus
US2036652A (en) * 1935-04-02 1936-04-07 Rca Corp Lead-in bushing
US2202607A (en) * 1936-08-21 1940-05-28 Allegemeine Elek Citatz Ges Electrode mounting
US2200694A (en) * 1937-09-21 1940-05-14 Pintsch Julius Kg Annular fusion joint
US2193640A (en) * 1938-05-21 1940-03-12 Gen Electric Glass-to-metal seal
US2296579A (en) * 1940-11-30 1942-09-22 Rca Corp Glass envelope seal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525737A (en) * 1948-04-14 1950-10-10 Rca Corp Plate support
DE1009317B (de) * 1951-11-26 1957-05-29 Philips Nv Elektrische Entladungsroehre

Also Published As

Publication number Publication date
CH234242A (de) 1944-09-15

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