US2925189A - Cathode-ray tube manufacture - Google Patents

Cathode-ray tube manufacture Download PDF

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Publication number
US2925189A
US2925189A US383871A US38387153A US2925189A US 2925189 A US2925189 A US 2925189A US 383871 A US383871 A US 383871A US 38387153 A US38387153 A US 38387153A US 2925189 A US2925189 A US 2925189A
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US
United States
Prior art keywords
strip
glass
sealing
metal
strips
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
US383871A
Other languages
English (en)
Inventor
Francis W Martin
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.)
Corning Glass Works
Original Assignee
Corning Glass Works
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 BE532034D priority Critical patent/BE532034A/xx
Application filed by Corning Glass Works filed Critical Corning Glass Works
Priority to US383804A priority patent/US2936924A/en
Priority to US383803A priority patent/US2968741A/en
Priority to US383871A priority patent/US2925189A/en
Priority to FR1112415D priority patent/FR1112415A/fr
Priority to DEC10026A priority patent/DE1064155B/de
Priority to GB28361/54A priority patent/GB789378A/en
Application granted granted Critical
Publication of US2925189A publication Critical patent/US2925189A/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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/24—Supports for luminescent material
    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to television picture tubes and is particularly directed to the construction of such a tube of the all-g1ass type suitable for the reproduction of pictures in color.
  • a tube that contains a suitable viewingscreen assembly which may comprise a tri-color phosphor plate and an aperture: mask or other grid-like controlling element and which is suitably mounted or otherwise positioned in the panel end of the tube. Since such a view ing-screen assembly is the same or substantially the same as the panel in area, it must be installed before the panel and the funnel are joined together. Because such viewingscreenzassembly is relatively sensitive to heat, however, it is necessary that the paneland the funnel be sealed to one another in such a way as to avoid heat damage thereto. This requirement thus renders the conventional manner of sealing the glass panel to the glass funnel of an all-glass black-and-white' picture tube unsuitable for the production of such a color picture. tube since the heat required to effect the seal is sufficient seriously to damage or otherwise to impair the viewingscreen assembly.
  • an allglass type of picture tube can be readily adapted for satisfactory use with such a' viewing-screen assembly by sealing the glass panel and the glass funnel to one another through the medium of endless substantially flat metal strip or ring elements whose outer dimensions or diameter is greater than that of the panel and the funnel.
  • Each such endless metal strip or ring element comprises a relatively thick portion and an associated relatively thin portion extending outwardly therefrom with the relatively thick portion substantially conforming in configuration to and following the outline of the sealing surface of the glass panel or the glass funnel and having a width substantially only sulficient to afford a satis-.
  • the relatively thick portion of one of such elements is butt-sealed to,the sealing surface of the glass paneh'and the relatively thick portion of the other element is buttsealed to the searing surface of the glass funnel.
  • the relatively thin portions of the two elements are in turn joined to each otherin sealing relation as by welding preferably at or adjacent totheir outer peripheries.
  • Such. endless metal ring element may take various embodiments.
  • it may comprise a metal strip having a flat or planar relatively thick portion and an'integral fiat or planar relatively thin portion extending outwardly therefrom.
  • it maycomprise a fiat or planar relatively thick metal strip and an associted fiat or planar relativelythin metal strip, the latter being joined to the formerin sealing relation and extending'outwardly therefrbmi plication, the mass of such a thin-thick metal sealing element is so distributed that no undue hoop stress and/or bending stress is created in the glass portion of the glass-to-metal seal.
  • the thick portion of the element provides the rigidity desirable in the glass-to-metal seal area to prevent deformation and pulling away of the metal from the glass.
  • the amount of heat required to weld them together is not sufiicient to damage'the glassto-met al seals.
  • Such relatively thin portions also possess sufiicient' resilience so that they can be flexed tothe extent necessary in preparation for their welding together.
  • FIG. 1 is a side elevation of an all-glass type of round television picture tube envelope embodying-the glass-to metal seal of the presentinventio'n.
  • Fig. 2' is an enlarged sectional view of a fragment of the picture tube envelope'of Fig. 1 showing one specific form of embodiment of the glass-to-rnetal seal.
  • Fig. 3 is a view similar to to Fig. 2 illustrating as'o'me What modified embodiment of the glass-to-metal seal.
  • Fig. 4 is a view similar to Fig. 3 showing the use of a concavo-e'onvex metal sealing strip in combination with
  • a similar but oppositelydisposed strip or ring comprising corresponding' parts-22', Z'Sf and 24 is-in a similar fashion butt sealed to i the funnel portibn' 25 'of the"tdbe "envelope.
  • the thick strip portions 22and 22' need be 1 only sufliciently wide to provide the necessary surface to effect a satisfactory butt seal.
  • Strip portions 23 and 23' are hermetically joined to one another at or adjacent to their outer boundaries preferably by welding as at 29'.
  • strip portion 22' is advantageously provided along its inner margin with an inwardly extending peripheral projection 26 to which are appropriately welded a plurality of spaced threaded studs 27 for supporting a viewing-screen assembly 20.
  • Projection 26 may be of any thickness suitable to provide the desired structural strength and may be welded or otherwise joined to portion' 22 as indicated or formed integrally therewith.
  • the metal seali'ng element includes a relatively thick strip 32 which is concavo-convex in transverse-cross-section and which is only of sufiicient width to provide the surface necessary for the butt seal to the panel portion 31'.
  • a companion strip 33 of relatively thin metal and advantageously also in part concave-convex in transverse crosssection as shown is arranged adjacent the opposite surface of strip 32 and is joined thereto as by welding along or adjacent to their inner margins as at 34.
  • Oppositely disposed corresponding strips 32 and 32' are similarly associated with respect to the funnel portion 35.
  • Preferably point loading is reduced by use of a gasket G, similar to gasket 28 of Fig. 2.
  • strips 32' and 33' are welded to one another preferably along a line outward from their inner margins as at 36. The latter manner of joining the thick and the thin strips may, of course, also be utilized in the panel-sealing element.
  • strip 33' desirably has an inwardly extending peripheral projection 37 which at suitably spaced intervals is provided with studs such as 38 for supporting a viewing: screen assembly 30.
  • studs such as 38 for supporting a viewing: screen assembly 30.
  • the adjoining similar strips 33 and 33' are welded to one another at or adjacent. to their outer margins as at 39.
  • one of the metal sealing elements may be substantially fiat as described in the above-identified Blanding- Shaver application.
  • such substantially flat metal sealing element is butt-sealed to the funnel portion, as indicated in the form of embodiment shown in Fig. 4.
  • the relatively thick strip 42 and the relatively thin strip 43 of the metal sealing element buttsealed to the panel portion 41 are identical to the corresponding strips 32 and 33' of the metal sealing element butt-sealed to the panel portion 31 shown in Fig.
  • the relatively thick strip 42 and the relatively thin strip 43' of the metal sealing element butt-sealed to the funnel portion 45 differ, however, from the relatively thick strip 32' and the relatively thin strip 33 of the corresponding metal sealing element butt-sealed to the funnel portion 35 in Fig. 3 in that the strips 42' and 43. are formed substantially fiat orplanar.
  • This arrangement is of particular advantage where there is any variance in the diameters of the respective metal sealing elements since a'greater lateral line contact variation can thereby be tolerated. With this construction, moreover, there is generally no need for the use of a compressible gasket, such as 46, between the panel and the funnel.
  • Strip portions 22 and 22' and strip portions 23 and 23' may respectively vary considerably in thickness, as may strips 32 and 32' and strips 33 and 33'. In any particular case, however, the optimum or desirable thickness ineach strip portion or strip depends in large part on the size of the tube as well as its shape and to some extent on the particular glass and metal utilized. In any event the relatively thin portions or the thin strips should not be so thick as to objectionably increase the hoop stress in the glass portion in the glass-to-metal butt seal or to introduce objectionable stresses into the glass parts when complementary thin strip portions or thin strips are clamped for welding. Moreover, if such thin strip portions or thin strips are too thick, the amount of heat necessary to effect the welding therebetween may be sutficient to require forced cooling of the glass-tometal seals in order to prevent damage thereto while making the weld.
  • an entirely satisfactory all-glass type of 15-inch round color television picture tube can be produced. in accordance with the present invention by the use of relatively thick strip portions or relatively thick strips ranging from 0.060" to 0.100 in thickness and by the use of relatively thin strip portions or relatively thin strips ranging from 0.020" to 0.030" in thickness.
  • the relatively thin strip portions or the relatively thin strips should not be much thinner than 0.020" since otherwise excessive warping may occur and the welding of complementary strips together may become objectionably diflicult.
  • this invention is equally applicable to either circular or non-circular including the so-called rectangular-type picture tubes, the glass-sealing portions of the metal sealing elements being merely conformed to the outline of the glass surfaces to which they are to be butt-sealed.
  • sealing strips embodying the invention can with equal facility be sealed to shallow-walled, concavo-convex, or substantially flat panels such as ordinarily employed in metal-funnel picture tubes.
  • the invention necessarily limited to picture tubes embodying glass funnels since a panel equipped with a sealing strip embodying the invention may withequal facility be edge-welded to a suitably shaped flange of a metal funnel.
  • An article comprising twov glass members having endless sealing surfaces facing one another, oneof said sealing surfaces being butt-sealed to one of two oppositely disposed broad surfaces of an endless metal strip, the other of'said sealing surfaces being butt-sealed to one of two oppositely disposed broad surface of another endlessmetal strip, the broad. surfaces 0 at least-one of" said metal strips beingconcavo-convex in transverse crosssection, the two metal strips being joined to each other in sealing relation at their opposite surfaces.
  • An article comprising two glass members, at least one of which is hollow, such members having endless sealing surfaces facing one another, and an assembly interposed between such sealing surfaces and comprising a pair of endless metal strip elements each such element comprising a relatively thick portion and an associated relatively thin portion extending outwardly therefrom, the relatively thick portion of one of said elements being concavo-convex in transverse cross-section and being butt-sealed to the sealing surface of one of said glass members, the relatively thick portion of the other of said elements being butt-sealed to the sealing surface of the other glass member, the relatively thin portions of the two elements being joined to one another insealing relation.
  • An article comprising two glass members, at least one of which is hollow such members having endless sealing surfaces facing one another, and an assembly interposed between such sealing surfaces and comprising a pair of endless metal strips, each such strip comprising a relatively thick portion and an integral relatively thin portion extending outwardly therefrom, the relatively thick portion of one of said strips being concavo-convex in transverse :ross-section and being butt-sealed to the sealing surface of one of said glass members, the relatively thick portion of the other of said strips being buttsealed to the sealing surface of the other glass member, the relatively thin portions of the two strips being joined to one another in sealing relation.
  • An article comprising two glass members, at least one of which is hollow such members having endless sealing surfaces facing one another, and an assembly interposed between such sealing surfaces and comprising a pair of endless metal elements, each such element comprising a relatively thick strip and an associated relatively thin strip, the relatively thin strip being joined to the relatively thick strip in sealing relation and extending outwardly therefrom, the relatively thick strip of one of said elements being concavo-convex in transverse crosssection and being butt-sealed to the sealing surface of one of said glass members, the relatively thick strip of the other of said elements being butt-sealed to the sealing surface of the other glass member, the relatively thin strips of the two elements being joined to one another in sealing relation.
  • a television picture tube comprising an envelope, said envelope comprising a glass viewing panel, a glass funnel, said panel and said funnel having endless sealing surfaces facing one another, and an assembly interposed between such sealing surfaces, said assembly comprising a pair of endless metal strip elements, each such element comprising a relatively thick portion and an associated relatively thin portion extending outwardly therefrom, the relatively thick portion of one of said elements being 5 concave-convex in transverse cross-section and being butt-sealed to the sealing surface of the panel, the relatively thick portion of the other of said elements being butt-sealed to the sealing surface of the funnel, the relatively thin portions of the two elements being joined to one another in sealing relation.
  • a television picture tube comprising an envelope, said envelope comprising a glass viewing panel, a glass funnel, said panel and said funnel having endless sealing surfaces facing one another, and an assembly interposed between such sealing surfaces, said assembly comprising a pair of endless metal strips, each such strip comprising a relatively thick portion and an integral relatively thin portion extending outwardly therefrom, the relatively thick portion of one of said strips being concavo-convex in transverse cross-section and being buttsealed to the sealing surface of the panel, the relatively thick portion of the other of said strips being butt-sealed to the sealing surface of the funnel, the relatively thin portions of the two strips being joined to one another in sealing relation.
  • a television picture tube comprising an envelope, said envelope comprising a glass viewing panel, a glass funnel, said panel and said funnel having endless sealing surfaces facing one another, and an assembly interposed between such sealing surfaces, said assembly comprising a pair of endless metal elements, each such element comprising a relatively thick strip and an associated relatively thin strip, the relatively thin strip being joined to the relatively thick strip in sealing relation and extending outwardly therefrom, the relatively thick strip of one of said elements being concavo-convex in transverse crosssection and being butt-sealed to the sealing surface of the panel, the relatively thick strip of the other of said elements being butt-sealed to the sealing surface of the funnel, the relatively thin strips of the two elements being joined to one another in sealing relation.
  • An article comprising a glass member having an endless sealing surface and an endless metal strip element, said element comprising a relatively thick portion and an associated relatively thin portion extending laterally therefrom, the relatively thick portion being concavo-convex in transverse cross-section and'being buttsealed to the sealing surface of the glass member, the relatively thin portion being adapted to be joined in sealing relation to another metal member.
  • An article comprising a glass member having an endless sealing surface and an endless metal strip, said strip comprising a relatively thick portion and an integral relatively thin portion extending laterally therefrom, the relatively thick portion being concave-convex in transverse cross-section and being butt-sealed to the sealing surface of the glass member, the relatively thin portion being adapted to be joined in sealing relation to another metal member.
  • An article comprising a glass member having an endless sealing surface and an endless metal element, said element comprising a relatively thick strip and an associated relatively thin strip, the relatively thin strip being joined to the relatively thick strip in sealing relation and extending outwardly therefrom, the relatively thick strip being concavo-convex in transverse cross-section and being butt-sealed to the sealing surface of the glass member, the relatively thin strip being adapted to be joined in sealing relation to another metal member.
  • An article comprising two glass members, at least one of which is hollow, such members having endless sealing surfaces facing one another, and an assembly interposed between such sealing surfaces and comprising a pair of endless metal elements, each such element comprising two strips that are concavo-convex in transverse cross-section arranged fiatwise with respect to one another and joined in sealing relation, one strip extending outwardly from the other, one element being butt-sealed to the sealing surface of one of said glass members and the other element being butt-sealed to the sealing surface of the other glass member, the outwardly extending strips of the two elements being joined to one another in sealing relation.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Joining Of Glass To Other Materials (AREA)
US383871A 1953-10-02 1953-10-02 Cathode-ray tube manufacture Expired - Lifetime US2925189A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE532034D BE532034A (en)van) 1953-10-02
US383804A US2936924A (en) 1953-10-02 1953-10-02 Cathode-ray tube manufacture
US383803A US2968741A (en) 1953-10-02 1953-10-02 Cathode-ray tube manufacture
US383871A US2925189A (en) 1953-10-02 1953-10-02 Cathode-ray tube manufacture
FR1112415D FR1112415A (fr) 1953-10-02 1954-09-17 Perfectionnements aux tubes de réception de télévision
DEC10026A DE1064155B (de) 1953-10-02 1954-09-30 Fernseh-Bildroehre mit einem glaesernen Bildfenster und einem Glaskonus
GB28361/54A GB789378A (en) 1953-10-02 1954-10-01 Improvements relating to cathode-ray tube manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US383871A US2925189A (en) 1953-10-02 1953-10-02 Cathode-ray tube manufacture

Publications (1)

Publication Number Publication Date
US2925189A true US2925189A (en) 1960-02-16

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US383871A Expired - Lifetime US2925189A (en) 1953-10-02 1953-10-02 Cathode-ray tube manufacture

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US (1) US2925189A (en)van)
BE (1) BE532034A (en)van)
DE (1) DE1064155B (en)van)
FR (1) FR1112415A (en)van)
GB (1) GB789378A (en)van)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037834A (en) * 1956-07-30 1962-06-05 Westinghouse Electric Corp Electron discharge device
US3912851A (en) * 1973-05-23 1975-10-14 Philips Corp Electric discharge tube and method of manufacturing same
EP0264116A3 (en) * 1986-10-16 1988-11-30 Nokia Graetz Gesellschaft Mit Beschrankter Haftung Shadow-mask picture tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4325489A (en) * 1980-04-17 1982-04-20 Rca Corporation Envelope for flat panel display devices

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178826A (en) * 1937-03-31 1939-11-07 Hygrade Sylvania Corp Closure member for electric discharge tubes and the like
US2194886A (en) * 1936-12-29 1940-03-26 Pintsch Julius Kg Fused joint
US2202469A (en) * 1936-08-10 1940-05-28 Erich F Huth G M B H Electric discharge vessel
US2254090A (en) * 1940-04-30 1941-08-26 Rca Corp Cathode ray tube envelope
GB583242A (en) * 1944-06-30 1946-12-12 Mi O Valve Co Ltd Improvements relating to the manufacture of glazed electrical orifices for use in connection with wave-guides
US2635205A (en) * 1951-12-04 1953-04-14 Kenneth T Snow Grid mounting for color television picture tubes
US2650683A (en) * 1949-11-03 1953-09-01 Collins Radio Co Metal-to-ceramic seal
US2690518A (en) * 1953-06-01 1954-09-28 Columbia Broadcasting Syst Inc Color picture tube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB586797A (en) * 1944-08-10 1947-04-01 Chance Brothers Ltd Improvements relating to cathode ray bulbs
GB688121A (en) * 1949-08-15 1953-02-25 British Thomson Houston Co Ltd Improvements relating to cathode ray tubes

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2202469A (en) * 1936-08-10 1940-05-28 Erich F Huth G M B H Electric discharge vessel
US2194886A (en) * 1936-12-29 1940-03-26 Pintsch Julius Kg Fused joint
US2178826A (en) * 1937-03-31 1939-11-07 Hygrade Sylvania Corp Closure member for electric discharge tubes and the like
US2254090A (en) * 1940-04-30 1941-08-26 Rca Corp Cathode ray tube envelope
GB583242A (en) * 1944-06-30 1946-12-12 Mi O Valve Co Ltd Improvements relating to the manufacture of glazed electrical orifices for use in connection with wave-guides
US2650683A (en) * 1949-11-03 1953-09-01 Collins Radio Co Metal-to-ceramic seal
US2635205A (en) * 1951-12-04 1953-04-14 Kenneth T Snow Grid mounting for color television picture tubes
US2690518A (en) * 1953-06-01 1954-09-28 Columbia Broadcasting Syst Inc Color picture tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037834A (en) * 1956-07-30 1962-06-05 Westinghouse Electric Corp Electron discharge device
US3912851A (en) * 1973-05-23 1975-10-14 Philips Corp Electric discharge tube and method of manufacturing same
EP0264116A3 (en) * 1986-10-16 1988-11-30 Nokia Graetz Gesellschaft Mit Beschrankter Haftung Shadow-mask picture tube

Also Published As

Publication number Publication date
DE1064155B (de) 1959-08-27
FR1112415A (fr) 1956-03-14
GB789378A (en) 1958-01-22
BE532034A (en)van)

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