US2635391A - Method of mounting vacuum tube electrodes - Google Patents

Method of mounting vacuum tube electrodes Download PDF

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Publication number
US2635391A
US2635391A US234743A US23474351A US2635391A US 2635391 A US2635391 A US 2635391A US 234743 A US234743 A US 234743A US 23474351 A US23474351 A US 23474351A US 2635391 A US2635391 A US 2635391A
Authority
US
United States
Prior art keywords
envelope
glass
electrode
rod
lead
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
US234743A
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English (en)
Inventor
Sanford F Essig
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.)
Farnsworth Research Corp
Original Assignee
Farnsworth Research 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 Farnsworth Research Corp filed Critical Farnsworth Research Corp
Priority to US234743A priority Critical patent/US2635391A/en
Priority to DEI6075A priority patent/DE965521C/de
Application granted granted Critical
Publication of US2635391A publication Critical patent/US2635391A/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
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/32—Sealing leading-in conductors
    • 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
    • H01J5/20—Seals between parts of vessels
    • H01J5/22—Vacuum-tight joints between parts of vessel
    • H01J5/26—Vacuum-tight joints between parts of vessel between insulating and conductive parts of vessel
    • 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
    • H01J5/44—Annular seals disposed between the ends of the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0037—Solid sealing members other than lamp bases
    • H01J2893/0041—Direct connection between insulating and metal elements, in particular via glass material
    • H01J2893/0043—Glass-to-metal or quartz-to-metal, e.g. by soldering

Definitions

  • This invention relates to methods of mounting vacuum tube electrodes and more particularly to methods of mounting electrode assemblies within glass envelopes for providing external connections through such glass envelopes.
  • an electrode lead may be sealed through a glass envelop by providing a glass bead on the end of thelead, which lead may be brought into contact externally of the envelope, the envelope then being heated to soften the glass and seal the rod and bead to the envelope.
  • Pressure may be exerted against the end of this rod inside the envelope so as substantially to seal the rod flush with the inner side of the envelope.
  • this method there is generally still a thin film of the glass left on the end of the electrode lead which must be removed as by grinding before connections can be made to the electrodes within the envelope.
  • a method for sealing an elemerit within a glass envelope which includes the steps of mounting the element inside the envelope with a portion or portions thereof substantially in contact with the interior of the envelope, heating the glass envelope locally in the region or regions of the'portions of the element in contact therewith to soften the glass so that it will partially collapse over these portions which are in contact and deforming the softened glass about these portions while the glass is still soft to retain the elements in place.
  • the portions in contact with the envelope may be individual electrode leads which may be beaded at the end adjacent the envelope prior to the heating.
  • a partial vacuum is preferably produced within the envelope to facilitate the collapse of the outer wall.
  • a suitable tool such as a prop erly shaped brush tool of graphite or preferably metal of such characteristics as the alloy Graph-Mo, may be used while the glass is still soft to clean ofi the glass from the portion of the lead extending externally of the envelope whereby in the complete assembly a rod for connection to external circuits is provided.
  • This method is particularly suitable for the mounting of the electron gun assemblies within the neck portion of cathode ray tubes and the like and is also further useful for the mounting of annular electrodes or electrode retaining elements in the walls of cylindrical tubes.
  • FIGs. 1, 2 and 3 are fragmentary views illustrating the application of the method steps in accordance with this invention for the mounting of an element with a lead extending through an envelope wall;
  • FIGs. 4., 5 and 6 illustrate the various steps of an alternative type electrode structure mounted in accordance with the method of this invention.
  • Fig. 7 is a cross sectional view of a tool for producing the final form of assembly as illustrated in Figs. 5 and 6.
  • the glass envelope wall shown at ll has mounted adjacent thereto an element 2 which may be an electrode to which is fastened a conductive rod 3.
  • element 2 On the end of rod 3 may be provided a glass head 4'.
  • the element 2 is positioned within the envelope so that the end of rod 3 carrying the glass bead 4 is substantially in contact with the inner surface of envelope Wall I.
  • Heat may be applied locally to the area adjacent the point of contact of rod 3 and envelope l as, for example, by the burner shown diagrammatically at 5.
  • the portion of the envelope adjacent rod 3 collapses as shown in Fig. 2 so that envelope Wall I is sealed to bead 4.
  • a tool 6 is depressed over the end of rod 3 and causing the rod to pierce the glass wall. The operation also strips the glass film from the exposed portion of the rod. The end of rod 3 enters an opening I in tool 6 so that lead-out rod 3 extends externally of the envelope.
  • the electrode may be positioned precisely as it should be within the envelope, and the lead-out seal is made without disturbing the precise positioning of the electrode elements.
  • the interior of the envelope may be partially evacuated so that the external air pressure will tend to push in the softened glass about the electrode rod.
  • a portion of a cylindrical envelope is shown at 8 to which may be coupled an exhaust pump 9 through exhaust tubulation l0.
  • an element H Positioned within envelope 8 is provided an element H having a flange l2 which is substantially in contact with the cylindrical wall of envelope 8. Heat may be applied peripherally around envelope 8 as indicated by burners i3 and I4 so as to soften the glass in the vicinity of flange I2 is a ring around envelope 8.
  • the pump 8 may be operated to reduce pressure within the envelope 8 so that the softened region in the wall will collapse inwardly around the edge of flange l2.
  • Tool [5 may be of graphite or some suitable metal and is provided with one or more slots or holes I6 and I1.
  • the slots in practice vary progressively in width so that the final one fits the electrode and efiectively strips off the residual glass.
  • final form of envelope such as shown in Fig. 5 is desired, that is, with the flange substantially flush with the outer surface of the envelope 8 but shaped about the edge of the flange, the notch l6 may be used for wiping this periphery.
  • a final fonn of structure as shown in Fig.
  • the narrow notch l 'l which is made substantially equal to the thickness of flange 12 is used for wiping this edge so that the 4 glass will be cleaned not only from the end of the flange l2 but from a portion of the sides of the flange external of envelope 8 as shown in Fig. 6.
  • a method of sealing an element within a glass envelope comprising the steps of mounting the element in the envelope with portions thereof substantially in contact with the interior of said envelope, heating the glass of said envelope locally to softness in the vicinity of the points of said contact to partially collapse the envelope at said points, deforming said glass about said portions while soft to retain said element in place, and providing a partial vacuum within said envelope during said heating to facilitate collapse.
  • a method of sealing an electrode lead through the wall of a substantially tubular glass envelope comprising mounting said electrode lead within said tubular envelope with said lead substantially in contact with the wall of said envelope, partially evacuating said envelope and heating said wall to soften said glass in the vicinity of said lead, whereby the softened portion of said wall will collapse about said lead, and removing said softened glass from said lead external of said envelope to provide an uncovered output lead for said electrode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US234743A 1951-07-02 1951-07-02 Method of mounting vacuum tube electrodes Expired - Lifetime US2635391A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US234743A US2635391A (en) 1951-07-02 1951-07-02 Method of mounting vacuum tube electrodes
DEI6075A DE965521C (de) 1951-07-02 1952-07-02 Verfahren zur Einschmelzung von Elektroden elektrischer Entladungsgefaesse in Glasumhuellungen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US234743A US2635391A (en) 1951-07-02 1951-07-02 Method of mounting vacuum tube electrodes

Publications (1)

Publication Number Publication Date
US2635391A true US2635391A (en) 1953-04-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US234743A Expired - Lifetime US2635391A (en) 1951-07-02 1951-07-02 Method of mounting vacuum tube electrodes

Country Status (2)

Country Link
US (1) US2635391A (de)
DE (1) DE965521C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155478A (en) * 1963-02-15 1964-11-03 Bell Telephone Labor Inc Adjustment of sealed reed contacts
US3160775A (en) * 1962-03-22 1964-12-08 Westinghouse Electric Corp Low-pressure gaseous discharge lamp with internally mounted recombination structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1293441A (en) * 1918-01-04 1919-02-04 Western Electric Co Combined metal and glass structure and method of forming same.
US2340459A (en) * 1942-02-11 1944-02-01 Eitel Mc Cullough Inc Method of making tubes
US2482119A (en) * 1940-10-08 1949-09-20 Mickley Erich Method of making stems for electric lamps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1293441A (en) * 1918-01-04 1919-02-04 Western Electric Co Combined metal and glass structure and method of forming same.
US2482119A (en) * 1940-10-08 1949-09-20 Mickley Erich Method of making stems for electric lamps
US2340459A (en) * 1942-02-11 1944-02-01 Eitel Mc Cullough Inc Method of making tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160775A (en) * 1962-03-22 1964-12-08 Westinghouse Electric Corp Low-pressure gaseous discharge lamp with internally mounted recombination structure
US3155478A (en) * 1963-02-15 1964-11-03 Bell Telephone Labor Inc Adjustment of sealed reed contacts

Also Published As

Publication number Publication date
DE965521C (de) 1957-06-13

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