US3792300A - Cathode ray tube having a conductive metallic coating therein - Google Patents

Cathode ray tube having a conductive metallic coating therein Download PDF

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Publication number
US3792300A
US3792300A US00263297A US3792300DA US3792300A US 3792300 A US3792300 A US 3792300A US 00263297 A US00263297 A US 00263297A US 3792300D A US3792300D A US 3792300DA US 3792300 A US3792300 A US 3792300A
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United States
Prior art keywords
cathode ray
ray tube
interior surface
conductive
improvement according
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
US00263297A
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English (en)
Inventor
D Benda
D Kerstetter
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GTE Sylvania Inc
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GTE Sylvania Inc
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Publication date
Application filed by GTE Sylvania Inc filed Critical GTE Sylvania Inc
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Publication of US3792300A publication Critical patent/US3792300A/en
Assigned to NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. reassignment NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981. (SEE DOCUMENT FOR DETAILS). Assignors: GTE PRODUCTS CORPORATION A DE CORP.
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
    • H01J29/94—Selection of substances for gas fillings; Means for obtaining or maintaining the desired pressure within the tube, e.g. by gettering
    • 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
    • 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
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
    • H01J31/201—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0727—Aperture plate
    • H01J2229/0777—Coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/88—Coatings
    • H01J2229/882—Coatings having particular electrical resistive or conductive properties

Definitions

  • a thin tertiary film of high-efficiency gas- 2.532,322 1/1952 Evans t 3/85 R adsorbing getter material is disposed over at least a 3279941 10/1966 Foster at 313/174 X portion of the secondary conductive coating material. 3,432,712 3/1969 Benda 313/181 7 Claims, 2 Drawing Figures ll, 33 H k 35 I I, 3 77 29 X,3
  • This invention relates to cathode ray tubes and more particularly to a color cathode ray tube employing a substantially open metallic member positioned adjacent to the screen and having a metallic coating discretely disposed therein to provide a final anode coating effecting a plurality of advantages for improving the life performance of the tube.
  • color cathode ray tubes of the type employing a multiple opening metallic member, such as a foraminous shadow mask or grid, positioned adjacent the patterned phosphor screen usually have an extensive opaque coating of electrically conductive colloidal graphite disposed on the interior surface of the envelope funnel portion.
  • This conductive graphite deposit commonly referenced as Aquadag, is applied to the funnel portion prior to tube assembly and subsequently provides several functions in the finished tube.
  • the funnel covering material being connected to the terminal anode electrode of the electron gun assembly, provides a continuation of the anode in the form of a final anode coating, whereof a peripheral unipotential field is established to surround the accelerated electron beam as it is projected from the gun toward the screen.
  • the extensive application of the Aquadag coating affords a common means for electrically connecting the high voltage button funnelconnection with the terminal electrode of the electron gun and the mask-screen region of the tube.
  • this internal coating in conjunction with a conductive coating. applied to the exterior surface of the funnel portion, forms a filter capacitor for the high voltage power supply. Additionally, this conductive internal coating provides shielding for the electron beam or beams and prevents secondary emission charging of the glass of the envelope.
  • This graphite or Aquadag coating being extensively applied over the internal surface of the funnel portion, sometimes tends to minutely peel or flake thereby releasing deleterious speck-like particles into the interior 'of the finished tube.
  • These contaminating particles are free'to migrate to vulnerable regions of the tube, e.g., the screen area where they may be evidenced as minute but annoying overshadows, or to the foraminous mask region where they may lodge blocking one or more apertures therein, or to the region of the electron gun where the particulate material may cause devastating leakage, arcs or shorts between electrodes.
  • application of the graphite coating to the interior of the funnel requires a separate manufacturing procedure utilizing specialized applicating equipment and labor, and as such adds to the manufacturing costs of the tube.
  • a further object is to produce a color cathode ray tube that evidences a minimum of loose particulate material therein.
  • Another object is to provide a color cathode ray tube having improved efficiency for internal gas cleanup; the structure of which lends itself to expeditious and economical fabrication procedures.
  • An additional object is to provide an expeditious and economical method for manufacturing an improved color cathode ray tube.
  • an improved color cathode ray tube of, for example, the shadow mask type has localized areas of a primary conductive substance disposed on the interior surface of the envelope funnel and neck portions separately covering the high voltage connection and electron gun assembly contact areas.
  • a substantially continuous secondary reflective coating of gas-sorbtive electrically conductive metallic material is applied over the interior surface of the shadow mask and the interior surface of the funnel portion. This secondary coating overlays and electrically connects the aforementioned areas of primary conductive coating and provides the peripheral final anode coating for the tube.
  • a thin tertiary film of a high-efficiency gasadsorbing getter material is disposed over at least a por tion of the final anode coating of conductive secondary material.
  • FIG. 1 is a sectional view of a shadow mask color cathode ray tube utilizing the invention.
  • FIG. 2 is a perspective view of one type of material effusing structure.
  • FIG. 1 there is shown in FIG. 1, for example, a shadow-mask type of color cathode ray tube 11 having an envelope 13 integrally comprising a face panel 15, a funnel portion 17, and a neck portion 19.
  • a patterned cathode-luminescent screen 21 of selected electron responsive phosphor materials is formed on the interior surface of the face panel 15.
  • a film of aluminum 22 is normally applied over the screen and the adjacent interior surface of the panel, such being accomplished by a vaporization procedure before the panel is attached to the funnel portion 17.
  • the apertured member 27 is formed of relatively thin metal such as, for example, low carbon steel material having a thickness in the order of 0.005 to 0.006 of an inch.
  • the multitudinous number of holes or apertures effect a mask transmission that is in the order of about 18 percent at the center which may diminish to about 12 percent at the edge.
  • the solid web of mask material 35 constitutes about 82 to 88 percent of the area of the apertured member 27.
  • the electron gun assembly 37 Disposed within the neck portion 19 of the tube is the electron gun assembly 37 while not fully detailed as to structure, comprises'at least one and usually two or more electron beam generating means.
  • the plural beam convergence means 39 which is terminally oriented on the gun assembly, has a plurality of resilient support and connective means or snubbers 41 that are formed to make contact with the interior of the neck portion 19.
  • the electron gun assembly is further positionally supported by a plurality of conductive pins (of which only four are shown) 43,44, 45, and 46 which traverse and are hermetically sealed in the stemwafer closure member 47.
  • This member is integrally sealed to the open end of the neck portion 19.
  • An exhaust tubulation incorporated in the closure member is shown as being hermetically sealed 49 in the completed tube structure. Prior to sealing, this tubulation is connected to a conventional vacuum or gas evacuation system, not shown, which is part of the tube processing procedure.
  • a primary conductive substance 53 for example, Aquadag or a suitable metallic material such as a .gold, silver, or aluminum substance.
  • One of the discrete areas covers the high voltage button region 55, extending substantially perimetrically therefrom to afford adequate areal contact with a subsequently applied metallic coating superjacently disposed thereover.
  • a second area is disposed in substantially the neck-funnel transition zone 57 of the envelope, in the region immediately forward of the electron gun assembly 37 wherein the support snubbers 41 terminally associated with the gun assembly make electrical contact therewith.
  • This transition-zone area 57 is usually in the shape of a substantially annular band forming a closed onductive loop.
  • a third contact area 59 is disposed on the forward region of the interior surface of the funnel portion 17 adjacent to the periphery of the shadow mask frame 25.
  • a resilient connective means 61 is attached to the mask frame and oriented in a manner to make a firm electrical connection with a portion of the adjacent contact area 59.
  • a secondary substantially continuous reflective coating 63 of a gas-sorbtive and electrically conductive metallic material such as for example, magnesium or magnesium alloy, is extensively and predeterminately disposed over the interior or back surface of the shadow mask 23 and over substantially the whole of the interior surface of the envelope funnel portion 17.
  • This extensive secondary metallic coating differing in composition from that of the primary conductive substance; provides several advantageous functions. Firstly, the conductive secondary coating overlays and electrically connects the before-described discrete primary coated substantially patch-like areas 55, 57 and 59, extending therebeyond to cover the glass wall of the funnel and thus provide a continuous final anode coating 60 for the tube.
  • this secondary exemplary magnesium coating is evaporatively applied to the interior surface after the cathode ray tube has been exhaust processed.
  • Such deposition provides a marked advantage, as during dispersal the magnesium is especially active in gettering residual oxygen that may be present within the vacuous space of the tube.
  • This beneficial gas-sorbing action provided by the deposition of the final anode coating, improves tube performance by relieving the gas-sorbing load of the later-applied regular barium containing getter.
  • a large portion of the regular gettering cpaacity is retained for maximum and longer gas-sorbing activity which is a promoting factor for longer life performance of the tube.
  • the exemplary magnesium being flashed in the ambient vacuum of the tube, provides a highly reflective mirrorlike coating on the interior surface of the shadow mask, and as such, acts as a heat radiator during tube operation.
  • This reflective characteristic tends to lower the operating temperature of the mask thereby reducing the mask shift effect during tube operation thusly providing an added advantage to overall tube performance.
  • a secondary material giver or source, 67 from which the secondary gas-sorbing reflective and conductive coating is evaporated, may be in the form of a stainless steel channelized ring or loop.
  • One such giver is shown as attached to the frame 25 of the shadow mask 23 by suitable support means 68 and oriented in a manner to disperse the secondary coating 63 over the interior of the funnel.
  • two or more of such sources may be utilized to adequately achieve the uniform coverage desired.
  • a channelized giver" 69 which is oriented, for example, on a support 71 attached to the beam convergence means 39 of the electron gun assembly 37. Being so located, the evaporable material 73, contained in the channel 75, is directed to cover the interior surface of the shadow mask, e.g., the interstitial webbing thereof in particular.
  • a thin tertiary film 77 of high-efficiency gas-sorbing getter material such as barium or barium alloy, is disposed as a third layer over at least a portion of the secondary or final anode coating 60.
  • this getter film material 77 also deposits on the interior of the mask, but it also is highly reflective or mirror-like, being evaporated in a vacuum environment.
  • a conventional source of getter material 81 is shown positioned on an antenna-type support 83 affixed to the electron gun assembly 37.
  • a method of fabricating the aforedescribed improved color cathode ray tube comprises a plurality of related steps as ensuingly described.
  • the patterned cathodoluminescent screen 21 is formed on the interior of the face panel by tech niques familiar to the art, wherein the openings in the spatially positioned shadow mask are utilized to produce the patterned areas of the screen.
  • the screened panel has a film of aluminum 22 applied interiorly 'thereover by a separate step employing specialized aluminizing equipment embodying a vacuum environment and a high temperature vaporization source.
  • the three discrete localized areas or patches 55, 57, 59 of primary conductive substance 53, such as Aquadag, are applied to the aforenoted respective regions of the envelope funnel and neck portions.
  • the shadow mask structure 23, with at least one giver or secondary material source 67 attached thereto, is spatially positioned within the screened and aluminized panel 15.
  • the panel portion is then peripherally frit sealed, as at 85, to the lip of the funnel portion 17.
  • the electron gun assembly 37 is inserted into the neck portion 19 of the tube and the supporting closure member 47 is sealed to the open end thereof as at 87.
  • the tube is then heated to substantially degas the envelope l3 and the tube structural elements, e.g., 23 and 37, contained therein.
  • the tube is evacuated of gases through the exhaust tubulation 48, shown in phantom as extending from the closure member 47.
  • the tubulation is hermetically sealed as indicated at 49, which effects complete closure of the envelope 13.
  • the secondary material source or sources 67 are activated by localized induction heating emanating from suitably energized coils oriented exteriorly of the envelope. This activation effuses the gas-sorbtive electrically conductive magnesium material into the interior of the envelope in a manner to overlay the discrete pri- There is thus provided an improved color cathode ray tube that evidences a minimum of loose particulate material, has improved efficiency for internal gas cleanup, exhibits enhanced operational and life performance characteristics, and one wherein the structure lends itself to expeditious and economical tube fabrication procedures.
  • An improved color cathode ray tube having an envelope including face panel, funnel and neck portions wherein a patterned cathodoluminescent screen is disposed on the interior surface of the face panel with a metallic member having a multitude of openings therein positioned spatially adjacent thereto, and wherein at least one electron gun is oriented in said neck portion in a manner to beam electrons toward said screen, said improvement comprising:
  • a primary conductive substance disposed on the interior surface of said funnel and neck portions over at least two discrete localized areas, one of said discrete areas covering at least the high voltage button area inthe funnel portion, and a second of said dis- Crete areas being disposed substantially in the neck-funnel transition zone of said envelope in the region immediately forward of said electron gun assembly wherein the terminal electrode of said gun assembly has associated connective means to make electrical contact therewith;
  • a secondary substantially uniform and continuous reflective coating of gas-sorbtive and electrically conductive metallic material disposed over the interior surface of said metallic member and substantially the whole of the interior surface of said funnel portion overlaying the discrete areas of primary conductive coating thereon to provide a final anode coating for the tube effecting means for establishing a peripheral unipotential field therein and electrically connecting said screen and metallic member region and said afore-rnentioned first and second discrete primary coated areas;
  • a thin tertiary film of high-efficiency gas-sorbing getter material disposed over at least a portion of said final anode coating of gas-sorlbtive electrically conductive secondary material.
  • cathode ray tube improvement according to claim ll wherein said second discrete area of said primary conductive substance is in the shape of a substantially annular band forming a closed conductive loop.
  • cathode ray tube improvement wherein a third localized discrete area of said primary conductive substance is disposed on the for ward region of the interior surface of said funnel portion adjacent the periphery of said metallic member whereof connective means associated with said pluralopening metallic member makes electrical contact therewith.
  • cathode ray tube improvement according to claim 1 wherein at least one source of said secondary gas-sorbtive conductive metallic final anode coating material is oriented relative to said metallic member.

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  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
US00263297A 1972-07-15 1972-06-15 Cathode ray tube having a conductive metallic coating therein Expired - Lifetime US3792300A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26329772A 1972-07-15 1972-07-15
US00393931A US3802757A (en) 1972-07-15 1973-09-04 Method of fabricating a cathode ray tube having a conductive metallic coating therein

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US3792300A true US3792300A (en) 1974-02-12

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US00393931A Expired - Lifetime US3802757A (en) 1972-07-15 1973-09-04 Method of fabricating a cathode ray tube having a conductive metallic coating therein

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BE (1) BE802367A (fr)
CA (1) CA997819A (fr)
DE (1) DE2333796A1 (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848154A (en) * 1973-12-13 1974-11-12 Gte Sylvania Inc Cathode ray tube antenna getter structure comprising permanent phase transformation bimetallic material
US3979633A (en) * 1974-09-25 1976-09-07 Gte Sylvania Incorporated Directional getter attached to multi-apertured member
US4029987A (en) * 1974-04-16 1977-06-14 S.A.E.S. Getters S.P.A. Wide channel getter device
FR2510812A1 (fr) * 1981-07-28 1983-02-04 Rca Corp Procede de traitement d'un tube a rayons cathodiques pour eliminer le blocage des ouvertures du masque, du aux particules chargees
US4374344A (en) * 1979-08-22 1983-02-15 Hitachi, Ltd. Color picture tube with electrically conductive frit film on envelope surface
US4403170A (en) * 1979-09-21 1983-09-06 Hitachi, Ltd. Color picture tubes
US4416642A (en) * 1981-07-28 1983-11-22 Rca Corporation Method for preventing blocked apertures in a cathode ray tube caused by charged particles
US4431939A (en) * 1981-07-28 1984-02-14 Rca Corporation Structure and method for eliminating blocked apertures caused by charged particles
US4686416A (en) * 1986-02-21 1987-08-11 Zenith Electronics Corporation Color CRT front assembly with tension mask support
US4733125A (en) * 1983-09-28 1988-03-22 Kabushiki Kaisha Toshiba Color picture tube
US4771214A (en) * 1985-03-18 1988-09-13 Kabushiki Kaisha Toshiba Electron tube provided with porous silicon oxide getter
EP0436477A3 (en) * 1990-01-05 1991-12-18 Saes Getters S.P.A. Gettering device and system for a cathode ray tube
US5541474A (en) * 1994-11-22 1996-07-30 Thomson Consumer Electronics, Inc. Getter spring assembly for a color cathode-ray tube
US6211628B1 (en) 1997-08-02 2001-04-03 Corning Incorporated System for controlling the position of an electron beam in a cathode ray tube and method thereof
US20030015954A1 (en) * 2001-06-01 2003-01-23 Tsuneharu Nomura Cathode-ray tube and cathode-ray tube manufacturing method
US6686686B1 (en) * 1999-10-21 2004-02-03 Sarnoff Corporation Bi-potential electrode space-saving cathode ray tube
US20050057140A1 (en) * 2003-09-17 2005-03-17 Park Sang Yoon Color cathode ray tube

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US4220893A (en) * 1976-07-26 1980-09-02 Zenith Radio Corporation Electrically resistive arc suppressor shadowing getter flash
US4232248A (en) * 1978-10-30 1980-11-04 Rca Corporation Internal metal stripe on conductive layer
US4638213A (en) * 1980-10-08 1987-01-20 Rca Corporation CRT with internal contact stripe or patch and method of making said stripe or patch
JPH0738295B2 (ja) * 1983-08-16 1995-04-26 株式会社東芝 カラー受像管
US4602187A (en) * 1984-06-28 1986-07-22 North American Philips Consumer Electronics Corp. Color CRT with composite arc suppression structure
US4622490A (en) * 1985-02-28 1986-11-11 Rca Corporation Cathode-ray tube with an internal magnetic shield
US4712041A (en) * 1985-08-20 1987-12-08 Zenith Electronics Corporation Color CRT tension mask support assembly with a glass frame
KR930008616B1 (ko) * 1990-06-25 1993-09-10 삼성전관 주식회사 칼라브라운관의 제조방법
US6546752B2 (en) * 1999-12-02 2003-04-15 Fiberstars Incorporated Method of making optical coupling device
EP1346390A1 (fr) * 2000-12-04 2003-09-24 Koninklijke Philips Electronics N.V. Procede de fabrication d'un tube cathodique
US20070200505A1 (en) * 2005-12-27 2007-08-30 Ju Gao Projection light source and methods of manufacture

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US2093699A (en) * 1932-03-08 1937-09-21 Farnsworth Television Inc Cathode ray tube
US2582822A (en) * 1948-12-04 1952-01-15 Rca Corp Cathode-ray tube with aluminized screen
US3279941A (en) * 1963-02-14 1966-10-18 Corning Glass Works Method of forming a moisture-collecting coating of porous glass
US3432712A (en) * 1966-11-17 1969-03-11 Sylvania Electric Prod Cathode ray tube having a perforated electrode for releasing a selected gas sorbed therein

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US3552818A (en) * 1966-11-17 1971-01-05 Sylvania Electric Prod Method for processing a cathode ray tube having improved life
US3621318A (en) * 1970-04-27 1971-11-16 Admiral Corp Color television picture tube with metallic film coating on funnel portion
US3768884A (en) * 1970-05-04 1973-10-30 Getters Spa Gettering

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US2093699A (en) * 1932-03-08 1937-09-21 Farnsworth Television Inc Cathode ray tube
US2582822A (en) * 1948-12-04 1952-01-15 Rca Corp Cathode-ray tube with aluminized screen
US3279941A (en) * 1963-02-14 1966-10-18 Corning Glass Works Method of forming a moisture-collecting coating of porous glass
US3432712A (en) * 1966-11-17 1969-03-11 Sylvania Electric Prod Cathode ray tube having a perforated electrode for releasing a selected gas sorbed therein

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848154A (en) * 1973-12-13 1974-11-12 Gte Sylvania Inc Cathode ray tube antenna getter structure comprising permanent phase transformation bimetallic material
US4029987A (en) * 1974-04-16 1977-06-14 S.A.E.S. Getters S.P.A. Wide channel getter device
US3979633A (en) * 1974-09-25 1976-09-07 Gte Sylvania Incorporated Directional getter attached to multi-apertured member
US4374344A (en) * 1979-08-22 1983-02-15 Hitachi, Ltd. Color picture tube with electrically conductive frit film on envelope surface
US4403170A (en) * 1979-09-21 1983-09-06 Hitachi, Ltd. Color picture tubes
US4398897A (en) * 1981-07-28 1983-08-16 Rca Corporation Method of processing a cathode-ray tube for eliminating blocked apertures caused by charged particles
DE3228024A1 (de) * 1981-07-28 1983-02-17 RCA Corp., 10020 New York, N.Y. Verfahren zur bearbeitung einer kathodenstrahlroehre zur eliminierung von infolge geladener partikel blockierter oeffnungen
US4416642A (en) * 1981-07-28 1983-11-22 Rca Corporation Method for preventing blocked apertures in a cathode ray tube caused by charged particles
US4431939A (en) * 1981-07-28 1984-02-14 Rca Corporation Structure and method for eliminating blocked apertures caused by charged particles
FR2510812A1 (fr) * 1981-07-28 1983-02-04 Rca Corp Procede de traitement d'un tube a rayons cathodiques pour eliminer le blocage des ouvertures du masque, du aux particules chargees
US4733125A (en) * 1983-09-28 1988-03-22 Kabushiki Kaisha Toshiba Color picture tube
EP0195594A3 (en) * 1985-03-18 1989-03-08 Kabushiki Kaisha Toshiba Electron tube
US4771214A (en) * 1985-03-18 1988-09-13 Kabushiki Kaisha Toshiba Electron tube provided with porous silicon oxide getter
US4686416A (en) * 1986-02-21 1987-08-11 Zenith Electronics Corporation Color CRT front assembly with tension mask support
EP0436477A3 (en) * 1990-01-05 1991-12-18 Saes Getters S.P.A. Gettering device and system for a cathode ray tube
US5541474A (en) * 1994-11-22 1996-07-30 Thomson Consumer Electronics, Inc. Getter spring assembly for a color cathode-ray tube
US6211628B1 (en) 1997-08-02 2001-04-03 Corning Incorporated System for controlling the position of an electron beam in a cathode ray tube and method thereof
US6686686B1 (en) * 1999-10-21 2004-02-03 Sarnoff Corporation Bi-potential electrode space-saving cathode ray tube
US20030015954A1 (en) * 2001-06-01 2003-01-23 Tsuneharu Nomura Cathode-ray tube and cathode-ray tube manufacturing method
US6858977B2 (en) * 2001-06-01 2005-02-22 Sony Corporation Cathode-ray tube and cathode-ray tube manufacturing method
US20050057140A1 (en) * 2003-09-17 2005-03-17 Park Sang Yoon Color cathode ray tube
US7105995B2 (en) * 2003-09-17 2006-09-12 Lg.Philips Display Co., Ltd. Color cathode ray tube

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Publication number Publication date
US3802757A (en) 1974-04-09
CA997819A (en) 1976-09-28
BE802367A (fr) 1974-01-16
DE2333796A1 (de) 1974-01-24

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