US2598286A - Method of sealing glass windows to metallic cones for cathode-ray tubes - Google Patents

Method of sealing glass windows to metallic cones for cathode-ray tubes Download PDF

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Publication number
US2598286A
US2598286A US179318A US17931850A US2598286A US 2598286 A US2598286 A US 2598286A US 179318 A US179318 A US 179318A US 17931850 A US17931850 A US 17931850A US 2598286 A US2598286 A US 2598286A
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US
United States
Prior art keywords
cone
window
glass
heated
cathode
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
US179318A
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English (en)
Inventor
Mulder Johannes Gijsbe Wilhelm
Hagenberg Theodorus
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 US2598286A publication Critical patent/US2598286A/en
Anticipated expiration legal-status Critical
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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
    • H01J9/26—Sealing together parts of vessels
    • H01J9/263—Sealing together parts of vessels specially adapted for cathode-ray tubes
    • 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
    • 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
    • H01J9/26—Sealing together parts of vessels
    • 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 sealing a glass window to a metallic cone of a cathoderay tube, more particularly of a television tube.
  • uniform heating is ensured within a comparatively short time and, furthermore, a mechanic simplification is obtained in that rotation of the cone and the window is not required.
  • the cone is surrounded by a heat radiating screen and heated by radiated heat, part of the cone is surrounded by a high-frequency coil, whilst by mutual displacement of the coil and the cone in the longitudinal direction of the cone, the heated zone of the cone is partly moved from the narrow end to the area of sealing of the window, the temperature of the heated zone being gradually increased so that the window is heated by radiation from the cone so that the edge of the window is sealed to the cone when the said zone has reached the sealing edge of the cone.
  • the upper face of the window is surrounded by a screen which is heated by radiation from the cone and thus itself heats the upper side of the window by radiation, while the lower face of the window is gradually heated by radiation from the heated zone of the cone. Since the temperature of this zone increases with increase of the diameter of the part of the cone provided within the high-frequency coil, the glass is 2 heated comparatively quickly.
  • the heat radiating screen provided at the upper face of the window is preferably shaped so that it is at all points equally spaced from the glass of the window and the screen can furthermore be blackened at its lower side and made reflecting at its upper side. The screen thus has a low thermal loss due to radiation whilst itself acquiring a high temperature due to the radiation from the cone so that the upper face of the window is likewise heated rapidly by radiation.
  • the heating of the screen may be accelerated and enhanced by flames directed on to the upper side.
  • An important advantage of heating of the glass by radiation consists in that the glass is heated by heat absorption simultaneously at its surface and at the interior so that the stresses in the glass are much smaller than with heating by burners, in which event the glass is heated from the outside towards the interior. Since rotation of the cone is not required, it may be arranged in a stationary holder with its wide end at the top, whilst the high-frequency coil, the height of which is small with respect to that of the cone, is adapted to be moved upwards or downwards. However, as an alternative, it is possible to make the base plate carrying the cone to be movable so as to enable the cone to be moved up and down within the stationary highfrequency coil.
  • Fig. 1 shows the arrangement of the cone and the window before sealing and Fig. 2 shows diagrammatically a complete cathode-ray tube.
  • reference numeral l indicates the metallic cone, the upper side of which is provided with a narrow flange bearing the glass window 2.
  • the cone is supported by a holder 3 and closed at its lower side by a rubber stopper which is traversed by a tube through which, in this example, nitrogen is blown into the cone.
  • the cone is partly surrounded by a high-freqeuncy coil 5, which at the beginning of the heating process occupies the position shown near the lower end of the cone. After switching-on the high-frequency current, that zone of the cone which is located within the coil becomes hot and heats by radiation the glass window 2 and, as the case may be, the heat radiating screen I.
  • the screen has a reflecting surface at least on the side remote from the window.
  • the screen I should be heated additionally by means of a burner, the screen being rotated in order to acquire a uniform temperature. This may be eifected in a very simple manner, as shown in Fig. 1'.
  • the screen I may be provided with marginal radial slits or it may consist of insulating material, in order to avoid overheating due to the high-frequency field of coil 5, when this coil has been moved upwards into the position with respect to the cone. During the gradual upward movement of the coil 5, the temperature of the heated zone becomes higher and higher sincethe metal of the cone in this zone approaches more and more the high-frequency coil.
  • the window 2 In the position 5', the window 2 is heated to approximately 350'", the flange 6 of the cone being strongly heated so that the edge of the window 2 is sealed to the flange 6.
  • the pressure of the gas which may be admitted. to the cone at its lower side enables the window 2 to be moved into the correct position with respect to the cone, since the window 2 now bears all around on the soft glass edge.
  • the high-frequency coil is rapidly moved downwards so that the glass of the edge of the window hardens.
  • the assembly is then removed from the holder 3 and placed in a furnace to ensure uniform cooling.
  • Ihe method according to the invention furthermore has the advantage that the. high-frequency current need not be controllable accurately but may be adjusted to a. given strength during the sealing process. Consequently, the heating of the glass need not be controlled by gradual intensification of the high-frequency field but is controlled exclusively by means of the position of the high-frequency coil with respect to the cone and the sealing edge 6.
  • the highirequency equipment may thus be simpler, whilst controlling the temperature of the window by moving the coil 5 is considerably simpler than manual readjustment of the high-frequency current for controlling the temperature of the window.
  • a glass tube 8 is sealed in the conventional manner to the narrow extremity of the cone, said tube being closed by a base 9 which carries an electrode system l0 (see Fig. 2).
  • the invention is suitable more particularly for sealing windows of large diameter, for example 40 to cms., and a thickness of the. glass of from 4' to 10 mms.
  • the high-frequency coil may have a diameter of approximately cms. and may consist of six turns of copper tubing in which a cooling liquid may circulate, as is common prac tice.
  • a method of sealing a glass window to the open end of a metallic cone for a cathode-ray tube comprising the steps of surrounding the window with a heat radiating screen, surrounding a portion of the metallic cone remote from the window with a coil excited by a high-frequency electric current to induce a localized zone of heat in said metallic cone, and moving the coil longitudinally relative to the cone in the direction of the window thereby displacing the heating zone towards the window so that the window is heated by radiation from the cone to an extent at which the edge of the window is sealed to the cone when the heating zone has reached the sealing edge of the cone.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Joining Of Glass To Other Materials (AREA)
US179318A 1949-09-10 1950-08-14 Method of sealing glass windows to metallic cones for cathode-ray tubes Expired - Lifetime US2598286A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL284602X 1949-09-10

Publications (1)

Publication Number Publication Date
US2598286A true US2598286A (en) 1952-05-27

Family

ID=19782449

Family Applications (1)

Application Number Title Priority Date Filing Date
US179318A Expired - Lifetime US2598286A (en) 1949-09-10 1950-08-14 Method of sealing glass windows to metallic cones for cathode-ray tubes

Country Status (7)

Country Link
US (1) US2598286A (de)
BE (1) BE498003A (de)
CH (1) CH284602A (de)
DE (1) DE833233C (de)
FR (1) FR1024421A (de)
GB (1) GB672672A (de)
NL (1) NL72675C (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751480A (en) * 1953-09-01 1956-06-19 Budd Co Induction heating apparatus and method of heating extensive surface areas
US2933855A (en) * 1956-01-25 1960-04-26 Rue Albert D La Apparatus for glass to metal sealing
US3131046A (en) * 1957-06-18 1964-04-28 Pilkington Brothers Ltd Multiple glazed window units
US3183361A (en) * 1959-08-07 1965-05-11 Texas Instruments Inc Method of making glass sealed electric circuit devices and article resulting therefrom
US3472413A (en) * 1966-09-08 1969-10-14 Rca Corp Glass seal manufacture
US3472640A (en) * 1966-09-08 1969-10-14 Rca Corp Glass seal manufacture
US4284867A (en) * 1979-02-09 1981-08-18 General Instrument Corporation Chemical vapor deposition reactor with infrared reflector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971358C (de) * 1953-05-12 1959-01-15 Glaswerk Wertheim Geraete Fuer Verfahren zum Verschmelzen des Bildfensters mit dem Glastubus einer Elektronenstrahlroehre

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1301714A (en) * 1913-09-09 1919-04-22 Karl Kueppers Method of and apparatus for forming glass tubes.
US2048556A (en) * 1934-01-04 1936-07-21 Gen Electric Glass-to-metal seal
US2296307A (en) * 1940-04-30 1942-09-22 Rca Corp Method of making glass-to-metal seals
US2359501A (en) * 1937-11-27 1944-10-03 Gen Electric Sealing-in apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1301714A (en) * 1913-09-09 1919-04-22 Karl Kueppers Method of and apparatus for forming glass tubes.
US2048556A (en) * 1934-01-04 1936-07-21 Gen Electric Glass-to-metal seal
US2359501A (en) * 1937-11-27 1944-10-03 Gen Electric Sealing-in apparatus
US2296307A (en) * 1940-04-30 1942-09-22 Rca Corp Method of making glass-to-metal seals

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751480A (en) * 1953-09-01 1956-06-19 Budd Co Induction heating apparatus and method of heating extensive surface areas
US2933855A (en) * 1956-01-25 1960-04-26 Rue Albert D La Apparatus for glass to metal sealing
US3131046A (en) * 1957-06-18 1964-04-28 Pilkington Brothers Ltd Multiple glazed window units
US3183361A (en) * 1959-08-07 1965-05-11 Texas Instruments Inc Method of making glass sealed electric circuit devices and article resulting therefrom
US3472413A (en) * 1966-09-08 1969-10-14 Rca Corp Glass seal manufacture
US3472640A (en) * 1966-09-08 1969-10-14 Rca Corp Glass seal manufacture
US4284867A (en) * 1979-02-09 1981-08-18 General Instrument Corporation Chemical vapor deposition reactor with infrared reflector

Also Published As

Publication number Publication date
DE833233C (de) 1952-03-06
NL72675C (de)
BE498003A (de)
CH284602A (de) 1952-07-31
FR1024421A (fr) 1953-04-01
GB672672A (en) 1952-05-28

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