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US2319691A - Cathode ray tube and process - Google Patents

Cathode ray tube and process Download PDF

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Publication number
US2319691A
US2319691A US444961A US44496142A US2319691A US 2319691 A US2319691 A US 2319691A US 444961 A US444961 A US 444961A US 44496142 A US44496142 A US 44496142A US 2319691 A US2319691 A US 2319691A
Authority
US
United States
Prior art keywords
neck
flange
tube
cathode ray
ray 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
US444961A
Other languages
English (en)
Inventor
Stanley J Koch
Robert E Rutherford
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.)
Allen B du Mont Laboratories Inc
Original Assignee
Allen B du Mont Laboratories Inc
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
Priority to BE472798D priority Critical patent/BE472798A/xx
Application filed by Allen B du Mont Laboratories Inc filed Critical Allen B du Mont Laboratories Inc
Priority to US444961A priority patent/US2319691A/en
Application granted granted Critical
Publication of US2319691A publication Critical patent/US2319691A/en
Priority to GB8127/43A priority patent/GB565486A/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
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/32—Seals for leading-in conductors
    • 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
    • H01J29/92—Means forming part of the tube for the purpose of providing electrical connection to it
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/34—Branched
    • Y10T403/348—Parallel rods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/47—Molded joint
    • Y10T403/477—Fusion bond, e.g., weld, etc.

Definitions

  • This invention relates to a cathode ray tube and the process oi producing the same.
  • the tube is of the sort in which the electrical gun assembly is attached to and supported by the conductors that pass through the glass press of the tube.
  • the conductors are sealed in place in such a way that they are spaced as far apart as is feasible since they are located on the circumference of a circle that is almost as large as the inside of the neck of the tube. In this way the wires are placed so far apart that there is maximum insulation between them. Also a. very large exhaust tubulation can be used, thus facilitating rapid pumping of the tube alter the tubulation has been sealed in place.
  • Fig. 1 is a longitudinal section through the neck 01' a tube along the line l-l of Fig. 2;
  • Fig. 2 is a section along the line 2-2 of Fig. 1:
  • Figs. 3 and 4 are longitudinal sections on an enlarged scale partly broken away showing steps in the process of manufacturing the tube.
  • Fig. 5 is a section along the line 5-5 of Fig. 4.
  • reference character I indicates the neck of a cathode ray tube.
  • a mandrel or This mandrel is provided with a circular series oi. longitudinally extending holes 3 near its outer edge and a larger central longitudinally extending hole 4 at its center.
  • An integral extension I in the form of a truncated cone is provided at the upper end of the mandrel 2.
  • the exhaust tabulation comprises a central tube 8 having a flange 9 with recesses or scallops along its outer edge. These recesses may be made by heating the edge of the flange and pressing inwardly and downwardly with a rod of suitable diameter at spaced intervals, thus producing the recesses I. and leaving an inwardly curved integral depending flange or lip I I at each recess III.
  • the tubulation 8 is placed upon the mandrel 2 with the flange 9 resting upon the extension 5.
  • Wires I2 having glass beads I3 fused thereon pass through the holes 3 of the mandrel 2 with the beads I! in the recesses ll, with these beads fitting in these recesses and in the curved lips II.
  • the disc I4 is of mica and is provided with holes I5 therethrough with eyelets I. in these holes.
  • the conductors or wires [2 pass through the eyelets l6, thus supporting this disc and the un structure of the tube, not shown.
  • the exhaust tubu- Fig. 1 After the sealing is finished the exhaust tubu- Fig. 1 they are inserted into the neck I of the tube with the edge of the flange I fitting the neck I. Heat is then applied at the level of the torch it around the whole circumference to fuse a circular area of the glass of the neck I, the beads It; the lips II and edge of flange 9 together so that they become integrated as indicated in Figs. 4 and 5 with the wires I! close to the inside surface of the wall of the neck I.
  • One or more blow torches may be used to apply the heat to the outside of the neck I on a level with the beads I and the tube or'the torches may be rotated while the heating takes place.
  • any excess portion of the neck I-below the heating zone may be permitted to drop off or the beads I3 and heating zone may be located so near the end of the neck I that no excess glass needs to be removed.
  • the entire gun structure of a cathode ray tube can be mounted upon the wires I2 and disc I4 and adjusted and inserted into the neck I of the glass tube preparatory to the heat sealing and evacuating steps.
  • This invention is applicable to vacuum tubes in general as well as cathode ray tubes.
  • the steps which comprise introducing into the neck of a glass tube an exhaust tubulation having a glass beaded flange with a serrated edge and having electric conductors in the serjunction of the rations and applying sumcient heat to said neck and flange to fuse them together.
  • the steps which comprise introducing into the neck of a glass tube an exhaust tubulation having a glass beaded flange with a serrated edge and depending portions curved to accommodate the beads and having electric conductors in the serrations and applying sumcient heat to said neck and flange to fuse them together.
  • the steps which comprise introducing into the neck of a glass tube an exhaust tubulation having a flange with a serrated edge and having electric conductors in the serrations, and applying heat to the outside of said neck in proximity to said flange.
  • a vacuum tube element comprising an exhaust tubulation having a serrated flange.
  • a vacuum tube element comprising an exhaust tubulation having a serrated flange and depending lips at the serrations.
  • a vacuum tube element comprising an exhaust tubulation having a serrated flange and depending inwardly curved lips at the serra-- ,tions.
  • a vacuum tube assembly comprising an exhaust tubulation having a serrated flange and beaded wires in said serrations.
  • a vacuum tube assembly comprising an exhaust tubulation having a serrated flange with depending portions at the ends of the serrations.
  • a vacuum tube assembly comprising an ex haust tubulation having a serrated flange with depending curved portions at the ends of the serrations.
  • a vacuum tube assembly comprising an exhaust tubulation having a serrated flange and headed wires in said serrations. the diameter of the respective beads on the wires being substantially the same as the transverse dimension of the corresponding serration.

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Insulating Bodies (AREA)
US444961A 1942-05-29 1942-05-29 Cathode ray tube and process Expired - Lifetime US2319691A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE472798D BE472798A (fi) 1942-05-29
US444961A US2319691A (en) 1942-05-29 1942-05-29 Cathode ray tube and process
GB8127/43A GB565486A (en) 1942-05-29 1943-05-21 Improvements in or relating to the manufacture of electric vacuum tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US444961A US2319691A (en) 1942-05-29 1942-05-29 Cathode ray tube and process

Publications (1)

Publication Number Publication Date
US2319691A true US2319691A (en) 1943-05-18

Family

ID=23767086

Family Applications (1)

Application Number Title Priority Date Filing Date
US444961A Expired - Lifetime US2319691A (en) 1942-05-29 1942-05-29 Cathode ray tube and process

Country Status (3)

Country Link
US (1) US2319691A (fi)
BE (1) BE472798A (fi)
GB (1) GB565486A (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518924A (en) * 1944-09-15 1950-08-15 Gen Electric Stem making method and apparatus
US4202999A (en) * 1978-04-11 1980-05-13 General Electric Company Fused silica lamp envelope and seal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518924A (en) * 1944-09-15 1950-08-15 Gen Electric Stem making method and apparatus
US4202999A (en) * 1978-04-11 1980-05-13 General Electric Company Fused silica lamp envelope and seal

Also Published As

Publication number Publication date
BE472798A (fi)
GB565486A (en) 1944-11-13

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