US2695477A - Method of manufacturing cathode-ray tubes - Google Patents

Method of manufacturing cathode-ray tubes Download PDF

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Publication number
US2695477A
US2695477A US191357A US19135750A US2695477A US 2695477 A US2695477 A US 2695477A US 191357 A US191357 A US 191357A US 19135750 A US19135750 A US 19135750A US 2695477 A US2695477 A US 2695477A
Authority
US
United States
Prior art keywords
window
cone
glass
seal
ray tubes
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
US191357A
Other languages
English (en)
Inventor
Otto Louis Van Steenis
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 US2695477A publication Critical patent/US2695477A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/20—Uniting glass pieces by fusing without substantial reshaping
    • C03B23/207—Uniting glass rods, glass tubes, or hollow glassware
    • C03B23/217—Uniting glass rods, glass tubes, or hollow glassware for the production of cathode ray tubes or similarly shaped tubes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers
    • 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
    • H01J5/24—Vacuum-tight joints between parts of vessel between insulating parts of 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
    • H01J2893/0038—Direct connection between two insulating elements, in particular via glass material
    • H01J2893/0039—Glass-to-glass connection, e.g. by soldering

Definitions

  • the invention relates to methods of sealing a glass window to the glass cone of a cathode-ray tube.
  • the weakest area is found in the transition zone between window and cone, since this zone is subject not only to compression but, at a particular area, also to tensile and shearing stresses in the glass owing to the pressure of the atmosphere. If a separate glass window is sealed to a glass cone, the difliculty arises that the seal between window and cone is then located precisely in the said critical zone, i. e. at the area of the greatest strains. This may be avoided by providing the seal outside the transition zone, for example by using a window with an upright edge. The seal is then located in the peripheral surface outside the rounding of the transition zone between window and cone.
  • Such windows with upright edges may be manufactured by bending over the edge of a flat glass plate or by moulding.
  • a separate operation and frequently a separate jig are involved and moulded windows frequently have faults, such as air bubbles or unevennesses of the surface. It is therefore advantageous to use a window made from a flat disc, for example in the form of a spherically sagged sheet of window glass (i. e. glass free from lead).
  • a solution of the problem of sealing a sheet of window glass to a glass cone so that the seal is at some distance from the rounding of the transition zone between window and cone is obtained if, according to the invention, in a method of manufacturing a cathode-ray tube comprising a glass window and a glass cone, in which a window made from sheet glass is placed in contact with a glass cone and sealed thereto, the cone and the window are slightly separated during the sealing of the edges, so that the seal becomes located in the peripheral surface of the cone and beyond the bend of the transition zone between window and cone.
  • the starting material may then be a slightly spherical, flat glass plate, the edges of which have not been subjected to special treatments, such as are required for the provision of an upright edge although the advantages attendant on the use of such a spherical window are nevertheless obtained.
  • Fig. 1 shows part of a window and a cone prior to scaling
  • FIG. 2 shows the same parts subsequent to sealing an Fig. 3 shows diagrammatically an arrangement for carrying out the method according to the invention.
  • 1 designates the wide end of the glass cone which, after the neck is sealed-on, is suspended thereby in a chuck 6 (Fig. 3) over the glass window 2.
  • the cone 1 and the window 2 are then set rotating together and heated, for example, by burners.
  • the window is raised until the said edges engage and are sealed together.
  • the window 2 is then lowered slightly (for example about 5 mms.), so that the seal is stretched and this seal between the glass of the window and the cone becomes located in the peripheral surface of the cone and outside the bend of the transition zone, as is designated in Fig. 2 by 5.
  • the inner surface of the bend of the transition zone between window and cone may be caused to assume a radius which exceeds the thickness of the screen, and
  • a method of manufacturing a cathode-ray tube comprising a glass window and a glass cone which comprises the steps of placing the glass window in contact with the glass cone, heating the cone and window to seal the edges thereof, and bending the edge of the window by simultaneously drawing the window slightly apart from the glass cone and exerting pressure externally on the seal while still soft to thereby displace the seal and locate the same in the peripheral surface of the cone outside gs bend of the transition zone between the: window and e cone.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
US191357A 1949-12-19 1950-10-21 Method of manufacturing cathode-ray tubes Expired - Lifetime US2695477A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL150558A NL73432C (de) 1949-12-19 1949-12-19

Publications (1)

Publication Number Publication Date
US2695477A true US2695477A (en) 1954-11-30

Family

ID=38464761

Family Applications (1)

Application Number Title Priority Date Filing Date
US191357A Expired - Lifetime US2695477A (en) 1949-12-19 1950-10-21 Method of manufacturing cathode-ray tubes

Country Status (8)

Country Link
US (1) US2695477A (de)
BE (1) BE500102A (de)
CH (1) CH286662A (de)
DE (1) DE826054C (de)
ES (1) ES195825A1 (de)
FR (1) FR1029825A (de)
GB (1) GB681647A (de)
NL (1) NL73432C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2853118A (en) * 1956-02-09 1958-09-23 Richardson Co Assembly apparatus
US2922256A (en) * 1955-08-22 1960-01-26 Gen Electric Co Ltd Methods of sealing a tubular glass neck portion to a glass wall
US2995869A (en) * 1957-10-24 1961-08-15 Libbey Owens Ford Glass Co Method of producing multiple sheet glazing units
US3207589A (en) * 1960-03-03 1965-09-21 Libbey Owens Ford Glass Co Method and apparatus for producing all-glass multiple sheet glazing units

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1075294B (de) * 1960-02-11
DE964709C (de) * 1954-05-05 1957-05-29 Glaswerk Wertheim Geraete Fuer Verfahren zum Herstellen von Glaskolben fuer Elektronenstrahlroehren und Vorrichtung zur Ausuebung des Verfahrens
DE961734C (de) * 1954-05-08 1957-04-11 Glaswerk Wertheim Geraete Fuer Verfahren zum Herstellen von Glaskolben fuer Elektronenstrahlroehren
DE3911356A1 (de) * 1989-04-07 1990-10-11 Nokia Unterhaltungselektronik Lagerungsvorrichtung fuer eine anzeigeeinrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2160434A (en) * 1936-07-18 1939-05-30 Corning Glass Works Television apparatus
US2215644A (en) * 1938-11-26 1940-09-24 Westinghouse Electric & Mfg Co Method of making a seal for discharge devices
US2236708A (en) * 1939-05-20 1941-04-01 Philco Radio & Television Corp Cathode ray tube vessel
GB536858A (en) * 1939-04-19 1941-05-29 Pilkington Brothers Ltd Improvements in and relating to articles of wholly or partly tempered glass
US2334123A (en) * 1942-03-13 1943-11-09 Gen Electric Method and apparatus for sealing glass envelopes
US2389360A (en) * 1942-04-07 1945-11-20 Corning Glass Works Double glazed window and method of manufacture
US2581945A (en) * 1943-11-27 1952-01-08 Sylvania Electric Prod Apparatus for sealing-in electron tubes and the like

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2160434A (en) * 1936-07-18 1939-05-30 Corning Glass Works Television apparatus
US2215644A (en) * 1938-11-26 1940-09-24 Westinghouse Electric & Mfg Co Method of making a seal for discharge devices
GB536858A (en) * 1939-04-19 1941-05-29 Pilkington Brothers Ltd Improvements in and relating to articles of wholly or partly tempered glass
US2236708A (en) * 1939-05-20 1941-04-01 Philco Radio & Television Corp Cathode ray tube vessel
US2334123A (en) * 1942-03-13 1943-11-09 Gen Electric Method and apparatus for sealing glass envelopes
US2389360A (en) * 1942-04-07 1945-11-20 Corning Glass Works Double glazed window and method of manufacture
US2581945A (en) * 1943-11-27 1952-01-08 Sylvania Electric Prod Apparatus for sealing-in electron tubes and the like

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2922256A (en) * 1955-08-22 1960-01-26 Gen Electric Co Ltd Methods of sealing a tubular glass neck portion to a glass wall
US2853118A (en) * 1956-02-09 1958-09-23 Richardson Co Assembly apparatus
US2995869A (en) * 1957-10-24 1961-08-15 Libbey Owens Ford Glass Co Method of producing multiple sheet glazing units
US3207589A (en) * 1960-03-03 1965-09-21 Libbey Owens Ford Glass Co Method and apparatus for producing all-glass multiple sheet glazing units

Also Published As

Publication number Publication date
CH286662A (de) 1952-10-31
DE826054C (de) 1951-12-27
GB681647A (en) 1952-10-29
ES195825A1 (es) 1952-06-16
FR1029825A (fr) 1953-06-08
NL73432C (de) 1953-05-15
BE500102A (de)

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