US2699510A - Cathode-ray tube - Google Patents

Cathode-ray tube Download PDF

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Publication number
US2699510A
US2699510A US268783A US26878352A US2699510A US 2699510 A US2699510 A US 2699510A US 268783 A US268783 A US 268783A US 26878352 A US26878352 A US 26878352A US 2699510 A US2699510 A US 2699510A
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US
United States
Prior art keywords
cone
enamel
cathode
ray tube
layer
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
US268783A
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English (en)
Inventor
Smelt Jozefus Antonius Maria
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 US2699510A publication Critical patent/US2699510A/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
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings

Definitions

  • This invention relates to cathode-ray tubes comprising an iron cone and a fluorescent screen produced on a glass window by the process known as settling.
  • Such tubes have a limitation in that the iron of the cone becomes corroded by the suspension agent of the settling liquid with the result that rust stains may be produced on the fluorescent screen. This may be avoided by coating the iron with a protective layer, for example an enamel layer. Since the cone must be thoroughly cleansed internally by chemical and/or mechanical means, such as etching, scouring and brushing it is apparent that only very persistent, readily adhering substances may be used to constitute the protective layer.
  • the object of the invention is to provide an improved cathode-ray tube.
  • Figure 1 is an outline drawing of a cathode ray tube.
  • Filgure 2 is a cross-sectional view on lines 2-2 of Figure
  • a cathode ray tube comprising a metal cone and a glass window on which a fluorescent screen is produced by the process known as settling, is characterised in that the cone consists of iron whereas at least the inner surface of the cone is coated with an electrically conductive layer constituted by a mixture of chemically resistant enamel and graphite. Such a layer is found to be resistant to chemical and mechanical cleansing means.
  • chemically resistant enamel is to be understood to mean an enamel which is not corroded by alkalies or acids. As a rule, the said enamel will have a high melting temperature (from 800 C. to 1100 C.).
  • the commercially known acid-resistant ground enamels generally satisfy this requirement.
  • composition of the enamel according to the invention is not very critical.
  • a favourable composition is, for example, 69% by weight SiOz; 2.2% by weight A1203; 18.6% by weight NazO; 8.7% by weight CaO; 0.5% by weight ZnO and 1% by weight CoO, which is admixed for example with from 7 to 9% by weight of the pulverulent graphite.
  • the cone After the cone is entirely or largely coated internally and if desired also externally by spraying or immersion with the said mixture, the cone, after dessication of the mixture, is put in a furnace which has a temperature of about 1100" C. At the end of about 3 minutes it is removed from the furnace and is then found to be coated with a highly persisting, conductive black enamel layer. It is found that due to the addition of graphite, the mechanical and chemical resistance is not decreased to such an extent that damage to or attack on the layer occurs during the cleaning of the cone or the settling process.
  • a cathode-ray tube comprising an iron cone, a glass window united with said cone, a fluorescent screen on the inner surface of said glass window, and an electricallyconductive coating on the inner surface of said iron cone, said coating being constituted by a fused mixture of an acidand alkali-resistant enamel having a melting point in excess of 800 C. and between about 5 and 10% by weight of graphite.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Glass Compositions (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US268783A 1951-02-24 1952-01-29 Cathode-ray tube Expired - Lifetime US2699510A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL304524X 1951-02-24

Publications (1)

Publication Number Publication Date
US2699510A true US2699510A (en) 1955-01-11

Family

ID=19783435

Family Applications (1)

Application Number Title Priority Date Filing Date
US268783A Expired - Lifetime US2699510A (en) 1951-02-24 1952-01-29 Cathode-ray tube

Country Status (7)

Country Link
US (1) US2699510A (en))
BE (1) BE509437A (en))
CH (1) CH304524A (en))
DE (1) DE909007C (en))
FR (1) FR1051773A (en))
GB (1) GB698856A (en))
NL (1) NL74555C (en))

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2886476A (en) * 1956-10-19 1959-05-12 Du Pont Resistors
US2901380A (en) * 1956-10-12 1959-08-25 Electrofilm Inc Solid lubricant films having vitreous enamel binders
US3108906A (en) * 1958-05-24 1963-10-29 Philips Corp Electric discharge tube
US3348917A (en) * 1960-07-22 1967-10-24 Minnesota Mining & Mfg Glass containing dissolved carbon, methods of making and using, and obtaining graphite
US3947608A (en) * 1973-11-26 1976-03-30 U. S. Philips Corporation Method of manufacturing an electrically conducting layer on an internal wall part of a cathode-ray tube
US4052641A (en) * 1975-03-14 1977-10-04 Corning Glass Works Electrically conductive coating in cathode ray tube
US4301041A (en) * 1979-10-22 1981-11-17 Zenith Radio Corporation Method and solution for conductive coating for use in cathode ray tubes
US5693259A (en) * 1991-10-04 1997-12-02 Acheson Industries, Inc. Coating compositions for glass surfaces or cathode ray tubes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8300914A (nl) * 1983-03-14 1984-10-01 Philips Nv Elektrische ontladingsbuis en werkwijze voor het vervaardigen van een elektrisch geleidende laag op een wandgedeelte van de omhulling van een dergelijke buis.
FR2957970B1 (fr) 2010-03-29 2013-01-11 Peugeot Citroen Automobiles Sa Dispositif d'injection dans une ligne d'echappement d'un agent reducteur gazeux
FR2961557B1 (fr) 2010-06-22 2014-01-24 Peugeot Citroen Automobiles Sa Strategie d'injection dans une ligne d'echappement d'un agent reducteur selectif des oxydes d'azote

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151992A (en) * 1934-11-30 1939-03-28 Firm Of Fernseh Ag Wall coating for braun tubes
US2162391A (en) * 1935-04-18 1939-06-13 Firm Of Fernseh Ag Electron tube with high ohmic wall coatings
US2222197A (en) * 1935-11-05 1940-11-19 Engels Bernhard Braun tube
US2223924A (en) * 1936-11-20 1940-12-03 Firm J D Riedel E De Haen Akt Preparation for use in carbon coating television tubes
US2254090A (en) * 1940-04-30 1941-08-26 Rca Corp Cathode ray tube envelope
US2376196A (en) * 1943-09-30 1945-05-15 Well Surveys Inc Ionization chamber

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151992A (en) * 1934-11-30 1939-03-28 Firm Of Fernseh Ag Wall coating for braun tubes
US2162391A (en) * 1935-04-18 1939-06-13 Firm Of Fernseh Ag Electron tube with high ohmic wall coatings
US2222197A (en) * 1935-11-05 1940-11-19 Engels Bernhard Braun tube
US2223924A (en) * 1936-11-20 1940-12-03 Firm J D Riedel E De Haen Akt Preparation for use in carbon coating television tubes
US2254090A (en) * 1940-04-30 1941-08-26 Rca Corp Cathode ray tube envelope
US2376196A (en) * 1943-09-30 1945-05-15 Well Surveys Inc Ionization chamber

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2901380A (en) * 1956-10-12 1959-08-25 Electrofilm Inc Solid lubricant films having vitreous enamel binders
US2886476A (en) * 1956-10-19 1959-05-12 Du Pont Resistors
US3108906A (en) * 1958-05-24 1963-10-29 Philips Corp Electric discharge tube
US3348917A (en) * 1960-07-22 1967-10-24 Minnesota Mining & Mfg Glass containing dissolved carbon, methods of making and using, and obtaining graphite
US3947608A (en) * 1973-11-26 1976-03-30 U. S. Philips Corporation Method of manufacturing an electrically conducting layer on an internal wall part of a cathode-ray tube
US4052641A (en) * 1975-03-14 1977-10-04 Corning Glass Works Electrically conductive coating in cathode ray tube
US4301041A (en) * 1979-10-22 1981-11-17 Zenith Radio Corporation Method and solution for conductive coating for use in cathode ray tubes
US5693259A (en) * 1991-10-04 1997-12-02 Acheson Industries, Inc. Coating compositions for glass surfaces or cathode ray tubes

Also Published As

Publication number Publication date
NL74555C (en))
BE509437A (en))
DE909007C (de) 1954-04-12
GB698856A (en) 1953-10-21
FR1051773A (fr) 1954-01-19
CH304524A (de) 1955-01-15

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