US2517023A - Shielding for electric discharge tubes - Google Patents

Shielding for electric discharge tubes Download PDF

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Publication number
US2517023A
US2517023A US681816A US68181646A US2517023A US 2517023 A US2517023 A US 2517023A US 681816 A US681816 A US 681816A US 68181646 A US68181646 A US 68181646A US 2517023 A US2517023 A US 2517023A
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US
United States
Prior art keywords
shielding
electric discharge
wall
glass
foil
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
US681816A
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English (en)
Inventor
Prakke Frits
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 US2517023A publication Critical patent/US2517023A/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
    • 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
    • C03C27/04—Joining glass to metal by means of an interlayer
    • C03C27/042—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts
    • C03C27/044—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts of glass, glass-ceramic or ceramic material only
    • 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
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/08—Vessels; Containers; Shields associated therewith; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings

Definitions

  • the thickness of the layers may be difierent:
  • the thickness of the conductive coating does not exceed 50 microns, the thickness of the enamel usually amounting to 0.1 to 0.5 mm.
  • the coefficients of expansion of the glass of the tube wall, of the enamel and of the coating must be adapted to each other. Solely in the case of these layers being extremely thin a difference in coefiicient of expansion is permissible. This holds in the case of thicknesses of the coating of less than 10 microns and thicknesses of the layer of enamel of the order of magnitude of 0.1 mm. and less.
  • the invention may be used very advantageously with'discharge tubes having a fiat glass bottom on to which a thin foil, for instance of chromeiron, is applied by means of enamel.
  • enamel use may be made of various vitreous materials-
  • use may be made of a combination of lead glass or lime glass and a lead-borate enamel having a composition: 65% by weight of PhD, 22.4% by weight of B203 and 12.6% by weight of S102; in this case the coefficients of expansion of the glass and the enamel substantially agree, chrome iron being a very suitable coating material. In this event these coefficients of expansion are about to x10.
  • the shielding means may be fastened with the aid of enamel having the following composition: 17% by weight of SiOz, 23% by weight of BzOa, 25% by weight of PhD, 10% by weight of ZnO and 25% by weight of M1102. If in this case a metal must be chosen, whose coefiicient of expansion is substantially matched to that of the glass and the enamel, the coating may, for instance, consist of tungsten or molybdenum.
  • Fig. 1 is a section of the fiat bottom of an electric discharge tube according to the invention
  • Fig. 2 is a plan thereof.
  • the reference number I denotes the flat bottom of an electric discharge tube into which is sealed a certain number of supply conductors 2.
  • a chrome iron shielding foil 3 which is secured to the bottom by means of a thin layer 4 of enamel.
  • this ioil' is furnished witlia tag- 5 which: is welded to one of the contact members 2; In" this way the contact between the shielding means and the supply conductor is established veryeasily also when making uselvofrthis; shielding; 1
  • vitreous enamel having a: thickness between about 0.1 mm. and aboutllbvmm. between said foil and said vitreous envelope porti'onbindling said foil thereto.
  • An electric discharge device comprising a vitreous envelope portion; a foil of chrome iron 4..
  • an electric. discharge tubewhi'ch includesv an envelope; the. combination: comprising; a: hard glass portion of said envelope; a conductivle foil;of. molybdenumhaving a .thiCkIlt-ZSSTOP less tlmn about fio-micronsoverlying at least a part: ofsaid hard glasspor-tion; and a lay-er of .vitreousenamel have ing-a thickness between about.0.1; mm..and;about; 052mm: between said molybdenum foil? and said hard glass envelope portion. binding-;; saidl foil thereto. 7
  • an electric discharge tube which includes an envelope, the combination comprising; a hard glass portion of said envelope; a conductive foil oftungsten having a thickness of less than about 50 microns overlying at least apart of said. hard glass portion; and a layer of vitreous enamel consisting by weight of essentially about 17% of S102, 23 of. B203, 25% of P30, about 10% of ZnO and about 25% of MnOz and having a thickness between about 0.1 mm. and about 0.5 mm. between said tungsten foil: and said hard glass envelope portion binding" said foil thereto.
  • an electric discharge tube including an envelope;thecombination comprising: a vitreous portion of. said envelope; a foil of chrome iron overlying a part of said vitreous portion; and a layer of lead-borate enamel consisting by weight of essentially about 65% of PEG, about 22.4% of BzOa-an.d.12.6% of SiOz between said chrome iii iron foil and said vitreous envelope portion binding: said. foil thereto.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US681816A 1943-04-06 1946-07-08 Shielding for electric discharge tubes Expired - Lifetime US2517023A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL619148X 1943-04-06

Publications (1)

Publication Number Publication Date
US2517023A true US2517023A (en) 1950-08-01

Family

ID=19788377

Family Applications (1)

Application Number Title Priority Date Filing Date
US681816A Expired - Lifetime US2517023A (en) 1943-04-06 1946-07-08 Shielding for electric discharge tubes

Country Status (4)

Country Link
US (1) US2517023A (enrdf_load_html_response)
FR (1) FR903188A (enrdf_load_html_response)
GB (1) GB619148A (enrdf_load_html_response)
NL (1) NL66619C (enrdf_load_html_response)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027482A (en) * 1956-11-20 1962-03-27 Rca Corp Lime glass article having a surface of reduced resistivity
US3465196A (en) * 1966-03-02 1969-09-02 Gen Electric Electric discharge device with means to prevent release of occluded gases from the envelope thereof and method
US6107566A (en) * 1998-11-07 2000-08-22 Emerson Electric Co. Hermetic terminal structure
US6509525B2 (en) 1998-11-07 2003-01-21 Emerson Electric Co. Hermetic terminal assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58501372A (ja) * 1981-09-01 1983-08-18 モトロ−ラ・インコ−ポレ−テツド 半導体デバイス及び半導体ダイをセラミックベースに接着させる方法

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1128817A (en) * 1912-07-03 1915-02-16 Wireless Specialty Apparatus Company Valve-detector for wireless.
US1266614A (en) * 1915-01-06 1918-05-21 Westinghouse Electric & Mfg Co Seal.
FR684526A (fr) * 1928-11-08 1930-06-26 Telefunken Gmbh Perfectionnements aux tubes électroniques
US1802371A (en) * 1928-08-03 1931-04-28 Francis J Bullivant Electromagnetic device
US1857645A (en) * 1927-03-11 1932-05-10 Arcturus Radio Tube Co Vacuum tube construction
US2056637A (en) * 1931-01-26 1936-10-06 Gen Electric Vapor Lamp Co Method of affixing foreing substances to a vitreous body
US2064184A (en) * 1936-12-15 Lead-in conductor
US2250184A (en) * 1938-02-08 1941-07-22 Hygrade Sylvania Corp Electron discharge tube
US2283090A (en) * 1941-04-30 1942-05-12 Rca Corp Composite glass and metal envelope
US2307027A (en) * 1940-05-10 1943-01-05 Davie Shielded radio tube
US2400011A (en) * 1943-01-06 1946-05-07 Cathodeon Ltd Screening of amplifying valves

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064184A (en) * 1936-12-15 Lead-in conductor
US1128817A (en) * 1912-07-03 1915-02-16 Wireless Specialty Apparatus Company Valve-detector for wireless.
US1266614A (en) * 1915-01-06 1918-05-21 Westinghouse Electric & Mfg Co Seal.
US1857645A (en) * 1927-03-11 1932-05-10 Arcturus Radio Tube Co Vacuum tube construction
US1802371A (en) * 1928-08-03 1931-04-28 Francis J Bullivant Electromagnetic device
FR684526A (fr) * 1928-11-08 1930-06-26 Telefunken Gmbh Perfectionnements aux tubes électroniques
US2056637A (en) * 1931-01-26 1936-10-06 Gen Electric Vapor Lamp Co Method of affixing foreing substances to a vitreous body
US2250184A (en) * 1938-02-08 1941-07-22 Hygrade Sylvania Corp Electron discharge tube
US2307027A (en) * 1940-05-10 1943-01-05 Davie Shielded radio tube
US2283090A (en) * 1941-04-30 1942-05-12 Rca Corp Composite glass and metal envelope
US2400011A (en) * 1943-01-06 1946-05-07 Cathodeon Ltd Screening of amplifying valves

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027482A (en) * 1956-11-20 1962-03-27 Rca Corp Lime glass article having a surface of reduced resistivity
US3465196A (en) * 1966-03-02 1969-09-02 Gen Electric Electric discharge device with means to prevent release of occluded gases from the envelope thereof and method
US6107566A (en) * 1998-11-07 2000-08-22 Emerson Electric Co. Hermetic terminal structure
US6362424B1 (en) 1998-11-07 2002-03-26 Emerson Electric Co. Hermetic terminal retainer structure
US6509525B2 (en) 1998-11-07 2003-01-21 Emerson Electric Co. Hermetic terminal assembly

Also Published As

Publication number Publication date
GB619148A (en) 1949-03-04
NL66619C (enrdf_load_html_response)
FR903188A (fr) 1945-09-26

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