US3895249A - Instant warm-up heater cathode - Google Patents

Instant warm-up heater cathode Download PDF

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Publication number
US3895249A
US3895249A US418644A US41864473A US3895249A US 3895249 A US3895249 A US 3895249A US 418644 A US418644 A US 418644A US 41864473 A US41864473 A US 41864473A US 3895249 A US3895249 A US 3895249A
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US
United States
Prior art keywords
cathode
heater
tubular enclosure
tubing
disc
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
US418644A
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English (en)
Inventor
Wolfram Andre
Eberhard Nill
Peter Schmidt
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.)
Alcatel Lucent NV
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
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Publication of US3895249A publication Critical patent/US3895249A/en
Assigned to ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS reassignment ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE
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
    • H01J29/04—Cathodes

Definitions

  • the present invention relates to an instant heat cathode for electron tubes such as television picture tubes and to an improved indirectly heated cathode construction therefore.
  • the usual cathode for a television picture tube includes a cylindrical tubing one end of which is closed with a cap carrying the emitting layer and the other end of which is open.
  • the heater element is inserted into the open end of the tubing which is mounted on a supporting disc and additional holding element.
  • the heater element is coated with a dark layer of insulating material, the inner surface of the cathode tubing around the heater element .is made non-reflective and the entire outer surface of the cathode tubing is roughened and/or of dark color.
  • FIG. 1 shows a conventional cathode construction of an indirectly heated cathode
  • FIG. 2 shows the novel cathode construction according to the present invention
  • FIG. 3 is a diagram showing the temperature distribution of the cathodes of FIGS. 1 and 2.
  • the known prior art type of cathode shown in FIG. 1 consists of a cylindrical cathode tubing 1 with a cap 2 including a suitable specially doped nickel coating welded to one end of the tubing. The face side of the cap is coated with the actual electron emitting layer 3. Positioned inside the cathode tubing is the coiled heater element 4 which occupies almost the entire length of the tubing.
  • the assembly including the cathode tubing with the cap and the heater element is mounted on a disc 6 with an additional holding element which may be of a suitable type having a single or multi-part construction.
  • This known cathode construction when plotted with temperature versus distance along the longitudinal dimension of the cathode tube, has a temperature distribution corresponding to curve K1 in FIG. 3.
  • the geometry of the cathode tubing with the cap and the emitting layer has been maintained.
  • the coiled heater element whose effective length is U1, is positioned inside the cathode tubing.
  • the length Lh is close to one half or less than the length Lk of the cathode tubing (FIG. 3).
  • the effective major part of the heat source, or coiled portion of the heater element lies very close to the emitting layer.
  • the heater element is coated with a layer of a suitable dark insulating material and the inside of the cathode tubing, at least within the area of the heater element, is designed to be substantially nonreflective. This causes good transfer of heat towards the emitting layer.
  • a suitable dark insulating material that can be used is a porous sintered mixture of aluminum oxide and a refractory metal such as tungsten, as described in copending application Ser. No. 415,256, filed Nov. 12, 1973, and assigned to the same assignee as the instant application.
  • a corresponding suitable dark colored coating and- /or roughening of the outer surface of the cathode tubing aids in concentrating the heat and attaining the desired final temperature. This is the operating temperature of the emitting layer which will not exceed the desired value.
  • This combination provides a temperature distribution having a curve as indicated by dashed line K2 in FIG. 3.
  • the present heater element requires no higher filament power than the previous conventional one according to FIG. I.
  • the final temperature of the emitting layer is reached within a few seconds.
  • a fast warm-up cathode for an electron tube comprising a hollow tubular enclosure having a closed end, an electron emissive layer on the outer surface of said end, a coiled heater element extending within said enclosure adjacent said end so that the ratio of the length of the tubular enclosure to the effective length of the coiled portion of the heater is at least 2:1, a supporting disc, a holding element securing said tubular enclosure to said disc, said tubular enclosure being mounted within said holding element and disc and an insulating coating of a layer of dark colored material on said heater, the inner and outer surfaces adjacent said end of said tubular enclosure around said heating element being substantially non-reflective and the entire said outer surface of said tubular enclosure being roughened.

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  • Electrodes For Cathode-Ray Tubes (AREA)
  • Solid Thermionic Cathode (AREA)
US418644A 1973-03-20 1973-11-23 Instant warm-up heater cathode Expired - Lifetime US3895249A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2313911A DE2313911B2 (de) 1973-03-20 1973-03-20 Schnell anheizende Kathode für Kathodenstrahlröhren

Publications (1)

Publication Number Publication Date
US3895249A true US3895249A (en) 1975-07-15

Family

ID=5875360

Family Applications (1)

Application Number Title Priority Date Filing Date
US418644A Expired - Lifetime US3895249A (en) 1973-03-20 1973-11-23 Instant warm-up heater cathode

Country Status (13)

Country Link
US (1) US3895249A (en, 2012)
JP (1) JPS559127B2 (en, 2012)
BE (1) BE812531A (en, 2012)
CA (1) CA1019385A (en, 2012)
CS (1) CS202174A2 (en, 2012)
DD (1) DD110974A5 (en, 2012)
DE (1) DE2313911B2 (en, 2012)
ES (1) ES424449A1 (en, 2012)
FR (1) FR2222747B1 (en, 2012)
GB (1) GB1436986A (en, 2012)
NL (1) NL7403571A (en, 2012)
PL (1) PL92465B1 (en, 2012)
RO (1) RO64641A (en, 2012)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4214117A (en) * 1977-02-05 1980-07-22 Bayer Aktiengesellschaft Furnace heated by radiation
US4370588A (en) * 1979-06-21 1983-01-25 Tokyo Shibaura Denki Kabushiki Kaisha Cathode assembly
US4554480A (en) * 1983-11-29 1985-11-19 Rca Corporation Cathode-ray tube having an electron gun assembly with emissivity modifying means
US4675573A (en) * 1985-08-23 1987-06-23 Varian Associates, Inc. Method and apparatus for quickly heating a vacuum tube cathode
US6191528B1 (en) 1997-12-22 2001-02-20 Hitachi, Ltd. Cathode ray tube having an improved indirectly heated cathode
KR100310683B1 (ko) * 1999-09-08 2001-10-18 김순택 전자총의 음극구조체와 이의 제조방법
US6614147B2 (en) 2000-01-11 2003-09-02 Hitachi, Ltd. Cathode ray tube having an improved indirectly heated cathode structure

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2614270C2 (de) * 1976-04-02 1982-04-15 Standard Elektrik Lorenz Ag, 7000 Stuttgart Kathodenaufbau
DE2654554C2 (de) * 1976-12-02 1983-04-21 Standard Elektrik Lorenz Ag, 7000 Stuttgart Pilzkathode für Kathodenstrahlröhren
US4184100A (en) * 1977-03-29 1980-01-15 Tokyo Shibaura Electric Co., Ltd. Indirectly-heated cathode device for electron tubes
DE2846796C2 (de) * 1978-10-27 1982-08-12 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zum Befestigen des Kathodenhalters einer Schnellheizkathode
DE2938248A1 (de) * 1979-09-21 1981-03-26 Standard Elektrik Lorenz AG, 70435 Stuttgart Heizelement fuer eine indirekt geheizte kathode
DE3029853C2 (de) * 1980-08-07 1982-08-26 Standard Elektrik Lorenz Ag, 7000 Stuttgart Indirekt durch Elektronenstoß geheizte Wehneltkathode
DE3145167A1 (de) * 1981-11-13 1983-05-26 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Anordnung mit einer thermionischen emissionskathode

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507812A (en) * 1945-08-17 1950-05-16 Cossor Ltd A C Thermionic cathode
US2914694A (en) * 1957-10-04 1959-11-24 Rca Corp Cathode assembly
US3376461A (en) * 1964-12-28 1968-04-02 Varian Associates Thermionic cathodes and high frequency electron discharge devices
US3450565A (en) * 1964-12-18 1969-06-17 Sylvania Electric Prod Method of coating heater coils

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1364978A (fr) * 1962-07-30 1964-06-26 Philips Nv Procédé pour recouvrir d'une couche isolante à rayonnement noir le filament d'unecathode à chauffage indirect
NL6513665A (en, 2012) * 1965-10-22 1967-04-24

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507812A (en) * 1945-08-17 1950-05-16 Cossor Ltd A C Thermionic cathode
US2914694A (en) * 1957-10-04 1959-11-24 Rca Corp Cathode assembly
US3450565A (en) * 1964-12-18 1969-06-17 Sylvania Electric Prod Method of coating heater coils
US3376461A (en) * 1964-12-28 1968-04-02 Varian Associates Thermionic cathodes and high frequency electron discharge devices

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4214117A (en) * 1977-02-05 1980-07-22 Bayer Aktiengesellschaft Furnace heated by radiation
US4308008A (en) * 1977-02-05 1981-12-29 Bayer Aktiengesellschaft Method for differential thermal analysis
US4370588A (en) * 1979-06-21 1983-01-25 Tokyo Shibaura Denki Kabushiki Kaisha Cathode assembly
US4554480A (en) * 1983-11-29 1985-11-19 Rca Corporation Cathode-ray tube having an electron gun assembly with emissivity modifying means
US4675573A (en) * 1985-08-23 1987-06-23 Varian Associates, Inc. Method and apparatus for quickly heating a vacuum tube cathode
US6191528B1 (en) 1997-12-22 2001-02-20 Hitachi, Ltd. Cathode ray tube having an improved indirectly heated cathode
US6335590B2 (en) 1997-12-22 2002-01-01 Hitachi, Ltd. Cathode ray tube having an indirectly heated cathode provided with a heater having a structure which substantially prevents cracks in an insulating coating thereof
KR100310683B1 (ko) * 1999-09-08 2001-10-18 김순택 전자총의 음극구조체와 이의 제조방법
US6614147B2 (en) 2000-01-11 2003-09-02 Hitachi, Ltd. Cathode ray tube having an improved indirectly heated cathode structure

Also Published As

Publication number Publication date
CA1019385A (en) 1977-10-18
PL92465B1 (en, 2012) 1977-04-30
NL7403571A (en, 2012) 1974-09-24
DE2313911A1 (de) 1974-10-03
GB1436986A (en) 1976-05-26
ES424449A1 (es) 1976-06-16
CS202174A2 (en) 1991-06-11
JPS49123569A (en, 2012) 1974-11-26
RO64641A (fr) 1978-12-15
JPS559127B2 (en, 2012) 1980-03-07
DE2313911B2 (de) 1975-09-25
DD110974A5 (en, 2012) 1975-01-12
FR2222747B1 (en, 2012) 1979-01-26
BE812531A (nl) 1974-09-20
FR2222747A1 (en, 2012) 1974-10-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE;REEL/FRAME:004718/0023

Effective date: 19870311