US3626231A - Thermal shunt for a cathode structure - Google Patents

Thermal shunt for a cathode structure Download PDF

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Publication number
US3626231A
US3626231A US804513A US3626231DA US3626231A US 3626231 A US3626231 A US 3626231A US 804513 A US804513 A US 804513A US 3626231D A US3626231D A US 3626231DA US 3626231 A US3626231 A US 3626231A
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US
United States
Prior art keywords
cathode
sleeve
temperature
bimetallic
contact
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
US804513A
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English (en)
Inventor
Maurice Kahl
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
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Publication of US3626231A publication Critical patent/US3626231A/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
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

Definitions

  • FIG. 7 and 8 Another embodiment is shown in FIG. 7 and 8 wherein the cathode 25 is supported within the control electrode 27 in a manner similar to that described for the embodiment illustrated in FIG. 6.
  • the insulative support member 85 has at least one aperture 93 wherein there is afiixed a vertical support 107 such as a metallic member suitably crimped to effect firm attachment.
  • a temperature regulating member 109 in the form of a strip of bimetallic material which is substantially arcuately formed to have an extremital portion 111 partially encircling the cathode sleeve in a spaced manner.
  • the cathode temperature has increased to approximately 855 C.
  • the heat radiating from the sleeve is sufficient to effect flexure of the bimetallic member bringing it into contact with the cathode. This is indicated at point X" where the thermal shunt effect between the sleeve and the lower temperature shield is introduced causing a heat sink reaction which results in lowering the operating temperature of the cathode as illustrated by the dot-dash line of curve C".
  • the cathode temperature at a heater voltage of Ef 7.0 v. would continue rising beyond point X" as shown by the continuation dash line of curve D".
  • Sustained cathode operation in the vicinity of 880 C. has a highly deleterious effect on cathode electron emission by greatly accelerating the loss of active barium emitter through rapid evaporation, thereby markedly reducing the operational lifespan of the tube.
  • An indirectly heated cathode structure in an electron gun of a cathode ray tube oriented relative to an associated control grid electrode and having means for regulating the temperature of the cathode electron emissive material when subjected to highrvoltage heater operation comprising:
  • said bimetallic temperature-regulating means is a formed substantially U-shaped member having a basal leg. an intermediate section and a terminal leg with a formed terminal end, said U-shaped member being oriented in an inverted position over the top rim of said shield with said basal leg of the U afiixed to the outer surface of the upper portion of the shield, said terminal leg of the U being free to move within the space between said shield and said sleeve to effect contact of the formed terminal end with the exterior of said sleeve when influenced by the increased temperature resultant from high-voltage heater operation, said U-shaped bimetallic member being oflaminated strip material having high and low expansion portions whereof the low expansion side forms the outer portion of the U.

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  • Electrodes For Cathode-Ray Tubes (AREA)
US804513A 1969-03-05 1969-03-05 Thermal shunt for a cathode structure Expired - Lifetime US3626231A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US80451369A 1969-03-05 1969-03-05

Publications (1)

Publication Number Publication Date
US3626231A true US3626231A (en) 1971-12-07

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ID=25189153

Family Applications (1)

Application Number Title Priority Date Filing Date
US804513A Expired - Lifetime US3626231A (en) 1969-03-05 1969-03-05 Thermal shunt for a cathode structure

Country Status (3)

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US (1) US3626231A (fr)
BE (1) BE746857A (fr)
DE (1) DE7008144U (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885191A (en) * 1974-03-06 1975-05-20 Gte Sylvania Inc Cathode-grid assembly for a cathode ray tube
US4499405A (en) * 1981-05-20 1985-02-12 Rpc Industries Hot cathode for broad beam electron gun
EP0407104A3 (en) * 1989-07-01 1991-03-20 Hitachi, Ltd. Inorganically insulated heater, process for production thereof and cathode ray tube using the same
US5027029A (en) * 1988-12-16 1991-06-25 Kabushiki Kaisha Toshiba Indirectly heated cathode assembly and its associated electron gun structure
US20090285360A1 (en) * 2008-05-19 2009-11-19 Yang Cao Apparatus for a compact hv insulator for x-ray and vacuum tube and method of assembling same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522259A (en) * 1948-05-06 1950-09-12 Bell Telephone Labor Inc Electrode temperature regulation
US3128407A (en) * 1960-11-14 1964-04-07 Rca Corp Cathode-grid assembly for electron guns
US3130339A (en) * 1961-06-02 1964-04-21 Sylvania Electric Prod Cathode cooling for electron discharge devices
US3351792A (en) * 1964-12-28 1967-11-07 Sylvania Electric Prod Quick warm-up heat-shielded cathode structure for cathode ray tubes
US3549929A (en) * 1968-08-30 1970-12-22 Zenith Radio Corp Bimetallic connector for completing path between cathode and heat sink for temperature control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522259A (en) * 1948-05-06 1950-09-12 Bell Telephone Labor Inc Electrode temperature regulation
US3128407A (en) * 1960-11-14 1964-04-07 Rca Corp Cathode-grid assembly for electron guns
US3130339A (en) * 1961-06-02 1964-04-21 Sylvania Electric Prod Cathode cooling for electron discharge devices
US3351792A (en) * 1964-12-28 1967-11-07 Sylvania Electric Prod Quick warm-up heat-shielded cathode structure for cathode ray tubes
US3549929A (en) * 1968-08-30 1970-12-22 Zenith Radio Corp Bimetallic connector for completing path between cathode and heat sink for temperature control

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885191A (en) * 1974-03-06 1975-05-20 Gte Sylvania Inc Cathode-grid assembly for a cathode ray tube
US4499405A (en) * 1981-05-20 1985-02-12 Rpc Industries Hot cathode for broad beam electron gun
US5027029A (en) * 1988-12-16 1991-06-25 Kabushiki Kaisha Toshiba Indirectly heated cathode assembly and its associated electron gun structure
EP0407104A3 (en) * 1989-07-01 1991-03-20 Hitachi, Ltd. Inorganically insulated heater, process for production thereof and cathode ray tube using the same
US5138221A (en) * 1989-07-01 1992-08-11 Hitachi, Ltd. Inorganically insulated heater, and cathode ray tube and air flow sensor using the same
US20090285360A1 (en) * 2008-05-19 2009-11-19 Yang Cao Apparatus for a compact hv insulator for x-ray and vacuum tube and method of assembling same
US7702077B2 (en) 2008-05-19 2010-04-20 General Electric Company Apparatus for a compact HV insulator for x-ray and vacuum tube and method of assembling same

Also Published As

Publication number Publication date
DE7008144U (de) 1970-08-20
BE746857A (fr) 1970-08-17

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.,

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708