US3293098A - Method of covering a glass wall portion of a cathode-ray tube - Google Patents

Method of covering a glass wall portion of a cathode-ray tube Download PDF

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Publication number
US3293098A
US3293098A US274508A US27450863A US3293098A US 3293098 A US3293098 A US 3293098A US 274508 A US274508 A US 274508A US 27450863 A US27450863 A US 27450863A US 3293098 A US3293098 A US 3293098A
Authority
US
United States
Prior art keywords
annular
matrix
shaped body
layer
armour
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
US274508A
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English (en)
Inventor
Spreugers Johannes
Stauttener Christia Franciscus
Cornelis Hendrik Van Glabbeek
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3293098A publication Critical patent/US3293098A/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
    • H01J29/86—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
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/87—Means for avoiding vessel implosion
    • H01J2229/875—Means substantially covering the output face, e.g. resin layers, protective panels
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
    • Y10T156/109—Embedding of laminae within face of additional laminae

Definitions

  • Our invention relates to a method of covering that portion of the glass wall of a cathode-ray tube, more particularly, a television display tube, which adjoins the end window with an implosion-resistant layer which also serves as a frame for the window.
  • the layer containing the armour and at least that portion of the layer which constitutes a frame for the picture field and which extends over the portion of the wall adjoining the picture field is first formed into an annular shaped body.
  • This body is then placed in an annular matrix of a shape similar to that of the portion of the wall to be covered so that it can slide over a cylindrical central part of a crosssectional area similar to the shape of the window end of the tube.
  • a hardenable material is poured in the liquid state onto the annular-shaped body of armour in the matrix, and subsequently, the matrix is moved towards the tube, whereby the annular-shaped body of armour is pushed against the tube wall and the hardenable material is pressed upwards through the armour up to the upper edge of the matrix.
  • the hardening material then is allowed to harden.
  • it is preferably first covered with .a thin layer of a material, for example, a silicone resin, paraffin, oil or the like, or a pulverulent material, to which the hardenable material does not adhere.
  • armour use may be made of fibres or textures of materials which can strengthen the layer of synthetic material sufficiently to prevent a crack in the glass from extending further.
  • Glass fibres of the order of a few centimetres in length have been found very suitable as an armour.
  • a metal gauze, glass or synthetic materials may be used as well.
  • the envelope of the tube may advantageously be provided previously with a layer of hard glass which may be subject to compressive stress, thus permitting the use of glass of a smaller wall thickness.
  • FIG. 1 is a sectional view of a matrix as used in the method according to the invention.
  • FIG. 2 is a sectional view of a pre-formed annular armour.
  • a cathode-ray tube for television picture display purposes which is otherwise entirely finished and comprises a neck 1, a glass cone 2 and a window 3, is maintained pushed by means of a vacuum suction-piece 4 on a cylindrical part 5 with the interposition of a sealing ring 6, for example of rubber.
  • the part 5 is surrounded by an annular matrix 7 which can slide up and down along it.
  • the left portion of FIG. 1, designated A showsthe position of the hollow annular matrix 7 in which the pre-formed annular-shaped body of armour material 8 (see also FIG. 2), for example glass-fibres held together by means of a binder, such as polyvinyl alcohol, may be placed in the matrix.
  • the matrix 7 may be constituted of metal or synthetic material.
  • the matrix is then pushed upwards by means of rods 11 into the position shown in the right side of FIG. 1 designated B in which the annular-shaped body of armour 8 is pushed against the portion of the window 3 which adjoins the window. Since the annular-shaped body of armour in position 8' also engages the sealing ring 6, a smooth boundary of the edge of the armour is obtained.
  • the matrix 7 is pushed upwards, the liquid 9 is pressed through the armour between the matrix and the envelope of the tube. The amount of liquid 9 is chosen so that it reaches exactly the upper edge of the matrix 7 in position 7 thereof.
  • the cone 2 of the cathode-ray tube has previously been provided with a protective layer consisting, for example of an armoured layer 10 of synthetic material, which now merges into a layer 8' adjoining the picture field, while the glass wall may previously be covered with a glue layer of polyvinyl acetate.
  • a protective layer consisting, for example of an armoured layer 10 of synthetic material, which now merges into a layer 8' adjoining the picture field, while the glass wall may previously be covered with a glue layer of polyvinyl acetate.
  • the cone may previously be covered with a cup, preferably made of metal, it then being possible to fill the space between this cup and the glass with a hardenable material in a state such that it can be poured in this space.
  • the metal cup is preferably provided with lugs for securing the tube in a receiver cabinet.
  • the matrix 7 is pushed downwards again, and after the vacuum in the suction piece 4 has been eliminated, the tube may be removed.
  • the edge of the armour 8', impregnated with the hardened material, which surrounds the window and may serve as a mask, is entirely smooth and needs no special after-treatment.
  • the armour may consist of any materials which are adequately strong, such as metal gauze, braided metal wire, glass or synthetic material. Besides, any hardenable material that can yield a sufficiently adhering and strong layer with the armour is usable, for example concrete.
  • a thin cup of, for example, metal or synthetic material could be used and serve afterwards as a smooth covering layer for the implosion-resistant layer 8.
  • a method of covering a portion of a glass wall of a cathode-ray tube adjoining an end window with an implosion-resistant layer which also serves as a frame for the end window comprising the steps, forming a mate rial which constitutes an armour for the layer into an annular-shaped body, placing the annular-shaped body in an annular matrix having a shape similar to that of the portion of the wall to be covered with an implosionresistant layer, placing the annular matrix containing the annular-shaped body on a cylindrical member having a cross-sectional area similar to that of the end window, interposing' a sealing member between the cylindrical member and the end window, applying in la fluid state a hardenable material onto the annular shaped body in the matrix, moving the matrix on said cylindrical member toward said tube whereby the annular-shaped body covered with hardenable material is pushed against the wall of the tube and the hardenable material pressed through the annular-shaped body to the upper edge of the matrix, and allowing the hardenable material
  • a method as claimed in claim 1 in which a cupshaped annular member is first inserted into the annular matrix before the annular-shaped body, the cup-shaped annular member thereafter serving as a covering layer for the implosion-resistant layer.
  • a method as claimed in claim 1 in which a covering layer is first applied over a portion of the tube adjoining that portion which is to be covered with the implosionresistant layer.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US274508A 1962-04-26 1963-04-22 Method of covering a glass wall portion of a cathode-ray tube Expired - Lifetime US3293098A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL277711 1962-04-26

Publications (1)

Publication Number Publication Date
US3293098A true US3293098A (en) 1966-12-20

Family

ID=19753786

Family Applications (1)

Application Number Title Priority Date Filing Date
US274508A Expired - Lifetime US3293098A (en) 1962-04-26 1963-04-22 Method of covering a glass wall portion of a cathode-ray tube

Country Status (9)

Country Link
US (1) US3293098A (d)
AT (1) AT238271B (d)
BE (1) BE631488A (d)
CH (1) CH410202A (d)
DE (1) DE1223066B (d)
DK (1) DK104579C (d)
ES (1) ES287335A1 (d)
GB (1) GB974652A (d)
NL (2) NL277711A (d)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293529A (en) * 1940-06-29 1942-08-18 Rca Corp Image tube
US2828799A (en) * 1955-10-10 1958-04-01 Du Pont Process of enveloping shaped objects
US3007833A (en) * 1958-12-29 1961-11-07 Dow Chemical Co Method of lamination
US3013117A (en) * 1957-11-22 1961-12-12 Philco Corp Mounting structure
US3028284A (en) * 1953-11-24 1962-04-03 John F Reeves Molding method for plastic bodies
US3075870A (en) * 1959-12-21 1963-01-29 Sylvania Electric Prod Cathode ray tube shield
US3200188A (en) * 1962-03-21 1965-08-10 Telefunken Patent Cathode ray tubes with insulated implosion protective frame

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293529A (en) * 1940-06-29 1942-08-18 Rca Corp Image tube
US3028284A (en) * 1953-11-24 1962-04-03 John F Reeves Molding method for plastic bodies
US2828799A (en) * 1955-10-10 1958-04-01 Du Pont Process of enveloping shaped objects
US3013117A (en) * 1957-11-22 1961-12-12 Philco Corp Mounting structure
US3007833A (en) * 1958-12-29 1961-11-07 Dow Chemical Co Method of lamination
US3075870A (en) * 1959-12-21 1963-01-29 Sylvania Electric Prod Cathode ray tube shield
US3200188A (en) * 1962-03-21 1965-08-10 Telefunken Patent Cathode ray tubes with insulated implosion protective frame

Also Published As

Publication number Publication date
GB974652A (en) 1964-11-11
BE631488A (d)
CH410202A (de) 1966-03-31
DE1223066B (de) 1966-08-18
AT238271B (de) 1965-02-10
DK104579C (da) 1966-06-06
ES287335A1 (es) 1963-08-01
NL277711A (d)
NL111481C (d)

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