US3728574A - Cathode cap - Google Patents

Cathode cap Download PDF

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Publication number
US3728574A
US3728574A US00190599A US3728574DA US3728574A US 3728574 A US3728574 A US 3728574A US 00190599 A US00190599 A US 00190599A US 3728574D A US3728574D A US 3728574DA US 3728574 A US3728574 A US 3728574A
Authority
US
United States
Prior art keywords
mesa
terminal
sleeve
cap
shoulder
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
US00190599A
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English (en)
Inventor
D Benda
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
GTE Sylvania 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 GTE Sylvania Inc filed Critical GTE Sylvania Inc
Application granted granted Critical
Publication of US3728574A publication Critical patent/US3728574A/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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/485—Construction of the gun or of parts thereof
    • 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
    • H01J1/26—Supports for the emissive material
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/027—Construction of the gun or parts thereof

Definitions

  • a closure cap having improved dimensional stability, is provided for capping a terminal-emitting cathode ray tube cathode sleeve.
  • the closure is diversely shaped to have a mesa-like terminal portion, with the planar end surface thereof formed to provide a flat substrate area to accommodate the deposition of electron emissive material thereon.
  • a strengthening transition portion extends from the periphery of the mesalike portion to form an' annular shoulder therearound.
  • a peripheral skirt portion extending downward from the shoulder, is of a length and internal diameter to facilitate encompassment and affixation to the terminal portion of the sleeve.
  • Terminal closures for end-emitting cathodes are conventionally formed as cup-like structures each having a flat or planar surface with a surrounding wall or skirt portion extending peripherally therefrom.
  • the planar surface provides a substrate for an area coating of thermionic emissive material, and the skirt portion is of a length and diameter to facilitate affixation to the upper end portion ofa cathode sleeve.
  • a further object is to provide a cathode cap that has a planar substrate surface that is minimally affected by cap-to-sleeve affixation means.
  • the foregoing objects are achieved in one aspect of the invention by providing an improved closure portion for capping a thermionic terminal-emitting cathode ray tube cathode sleeve.
  • the closure cap which exhibits improved dimensional stability is shaped to have a mesa-like terminal portion whereof the planar end surface provides a substrate upon which a coating of electron emissive material is subsequently disposed.
  • Extending peripherally outward from the base of the mesa-like portion is a strengthening transition portion forming an annular shoulder therearound.
  • a skirt portion extends from the outer periphery of the shoulder in a direction opposed to the terminal portion to provide for the attachment of the cap to the sleeve.
  • FIG. 1 is an enlarged partial sectional showing orientation of the invention relative to the cathode sleeve, the shield, and the control grid in a cathode ray tube electron gun;
  • FIG. 2 is an enlarged view of the improved cathode cap
  • FIG. 3 is a plan view of the improved cap taken along the line 33 of FIG. 2.
  • FIG. 1 there is shown an enlarged sectional view illustrating part of a cathode ray tube electron gun ll spacially oriented by means, not shown, within the tubular neck portion 13 of a cathode ray tube envelope.
  • the exemplary electron gun structure 11 is comprised of a number of electrodes, one of which is a control grid 15 having an aperture 17 therein.
  • Control grid support means 19 are appropriately embedded in the electron gun insulative support rods 21.
  • a cathode assembly 23 Positioned adjacent the control grid 15 is a cathode assembly 23, comprising for example, a cathode shielding eyelet 25, a substantially cylindrical cathode sleeve 27, and a terminally attached improved closure cap 29.
  • the end or planar terminal surface 31 of the cap forms a flat substrate for the thermionic electron emissive coating 33.
  • a cathode assembly support member 35 is embedded in the gun insulative support rods 21 to provide the proper spatial relationship between the emissive material 33 and the control grid aperture 17. It is to be noted that the aforedescribed cathode placement and support means is not to be considered limiting.
  • a conventional heater 37 is positioned by support means 38 within the cathode sleeve 27 through the open end 39 thereof to provide the necessary operational heat thereto to promote the desired thermionic emission from the emissive material 33.
  • FIGS. 2 and 3 To describe the improved cathode cap 29, reference is made to FIGS. 2 and 3 in particular, wherein the cap structure is shown in greater detail.
  • This closure cap is made of a conventional nickel or nickel alloy material that is promotive of thermionic electron emission, and as such, provides a proper substrate for the subsequently applied emissive coating 33, as shown in FIG. 1.
  • the cap is formed to encompass the end portion of the metallic cathode sleeve 27 and be attached or affixed thereto as by a plurality of welds or bonds 41.
  • the improved closure cap 29 is structurally shaped to have a substantially circular mesa-like terminal portion 43 that is formed of an upstanding wall 45 topped by the substantially planar end or substrate surface 31.
  • a strengthening transition portion 47 extends integrally from the periphery of the base 49 of the upstanding wall 45 to form a substantially outstanding annular shoulder portion thereabove. While not essential, it is preferable that the wall 45 and the annular shoulder portion 47 form a substantially right angle 6 relationship therebetween to clearly define the mesa-like structure; with the plane of the substrate surface 31 being substantially parallel with the plane of the annular shoulder portion 47.
  • a skirt portion 51 extends from the outer periphery 53 of the shoulder portion 47 in a downward directional manner opposed to the mesalike portion 43.
  • the skirt portion 51 has an internal diameter a of a dimensional tolerance slightly larger than the external diameter b of the cathode sleeve 27 to facilitate fitted terminal encompassment of the sleeve.
  • the formed structure of the cap is advantageous in maintaining dimensional stability during cathode assembly and subsequent operation.
  • the relationship between the transition portion 47 and the upstanding wall 45 of the terminal portion 43 provides a stabilizing hinge-effect therebetween; the apex of the right angle 6 being formed with as small a radius as possible at the wall periphery 49 to promote hinging action.
  • annular shoulder 47 and the adjoining wall 45 have also been found to be advantageous in fabrication of the sleevecap assembly, in that, any placement pressure necessary to position the cap 29 on the end portion of the sleeve 27 can be discretely directed or applied to the shoulder area 47 rather than against the critical planar substrate surface 31.
  • the mesa-like terminal construction 43 is additionally advantageous in that it can be utilized to center the heater 37' within the cathode cap 29 thereby promoting a uniformity of temperature distribution in particularly the terminal portion of the cap.
  • the internal periphery 50 of the mesa portion 43 and the end shaping of the heater 37' are compatibly dimensioned to provide guided and supportive centralized positioning of the heater relative to the planar surface 31 of the cap.
  • a slight outward annular flare 59 is circumferentially formed about the edge of the skirt portion 51.
  • an improved cathode closure cap that has enhanced dimensional stability, and one wherein the terminal planar substrate surface is minimally affected by movement of the skirt during cap-to-sleeve attachment.
  • a terminal closure cap formed to telescopically encompass the end portion of a substantially cylindrical cathode sleeve, said cap being formed of a material promotive of thermionic electron emission and comprising:
  • a substantially circular mesa-like terminal portion formed of an upstanding wall extending from an annular portion normal thereto and topped by a substantially planar end surface formed to provide a flat substrate area upon which an electron emissive material is subsequently disposed, said mesalike terminal portion having an internal diameter less than that of said associated cathode sleeve;
  • a strengthening transition portion integrally extending from the periphery of the base of said mesalike portion to form a substantially outstanding annular shoulder portion thereabout, said upstanding wall of said mesa-like terminal portion forming a substantially right angle with said shoulder portion, the apex of said right angular relationship having a small radius to promote a hinge effect between said wall and said shoulder, the plane of said substrate being substantially parallel with the plane of said annular shoulder portion;
  • skirt portion extending from the outer periphery of said shoulder portion in a manner opposed to said mesa-like portion, said skirt portion having a flared lip circumferentially formed about the edge thereof and an internal diameter of a value to facilitate fitted telescopic encompassment and plural bond affixation to the terminal sidewall portion of said sleeve.

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  • Solid Thermionic Cathode (AREA)
US00190599A 1971-10-19 1971-10-19 Cathode cap Expired - Lifetime US3728574A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19059971A 1971-10-19 1971-10-19

Publications (1)

Publication Number Publication Date
US3728574A true US3728574A (en) 1973-04-17

Family

ID=22702004

Family Applications (1)

Application Number Title Priority Date Filing Date
US00190599A Expired - Lifetime US3728574A (en) 1971-10-19 1971-10-19 Cathode cap

Country Status (3)

Country Link
US (1) US3728574A (fr)
BE (1) BE790267A (fr)
CA (1) CA989928A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071803A (en) * 1974-09-19 1978-01-31 Tokyo Shibaura Electric Co., Ltd. Electron gun assembly
US20050033148A1 (en) * 1998-09-08 2005-02-10 Ulrich Haueter Module for a computer interface

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930004222B1 (ko) * 1991-03-22 1993-05-21 주식회사 금성사 음극선관용 전자총의 음극구조체

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510267A (en) * 1946-10-30 1950-06-06 Rca Corp Grid cathode assembly for cathoderay tubes
US3005123A (en) * 1959-07-16 1961-10-17 Griffiths Electronics Inc Electron gun construction
US3005926A (en) * 1959-05-22 1961-10-24 Westinghouse Electric Corp Cathode for electron discharge device
US3040200A (en) * 1959-11-24 1962-06-19 Westinghouse Electric Corp Electron discharge device
US3155865A (en) * 1961-12-15 1964-11-03 Gen Electric Low power heater
US3240978A (en) * 1962-05-11 1966-03-15 Sylvania Electric Prod Cathode assembly for an electron tube
US3265920A (en) * 1964-06-22 1966-08-09 Rauland Corp Electron-discharge device cathode assembly with radiation shield
US3319102A (en) * 1962-08-20 1967-05-09 Kentucky Electronics Inc Electron gun assembly with increased cooling surfaces
US3504220A (en) * 1967-09-14 1970-03-31 Naum Aronovich Iofis Cathode unit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510267A (en) * 1946-10-30 1950-06-06 Rca Corp Grid cathode assembly for cathoderay tubes
US3005926A (en) * 1959-05-22 1961-10-24 Westinghouse Electric Corp Cathode for electron discharge device
US3005123A (en) * 1959-07-16 1961-10-17 Griffiths Electronics Inc Electron gun construction
US3040200A (en) * 1959-11-24 1962-06-19 Westinghouse Electric Corp Electron discharge device
US3155865A (en) * 1961-12-15 1964-11-03 Gen Electric Low power heater
US3240978A (en) * 1962-05-11 1966-03-15 Sylvania Electric Prod Cathode assembly for an electron tube
US3319102A (en) * 1962-08-20 1967-05-09 Kentucky Electronics Inc Electron gun assembly with increased cooling surfaces
US3265920A (en) * 1964-06-22 1966-08-09 Rauland Corp Electron-discharge device cathode assembly with radiation shield
US3504220A (en) * 1967-09-14 1970-03-31 Naum Aronovich Iofis Cathode unit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071803A (en) * 1974-09-19 1978-01-31 Tokyo Shibaura Electric Co., Ltd. Electron gun assembly
US20050033148A1 (en) * 1998-09-08 2005-02-10 Ulrich Haueter Module for a computer interface
US7931613B2 (en) * 1998-09-08 2011-04-26 Roche Diagnostics International Ag Module for a computer interface
US20110166426A1 (en) * 1998-09-08 2011-07-07 Roche Diagnostics International Ag Module for a computer interface
US8702605B2 (en) 1998-09-08 2014-04-22 Roche Diagnostics International Ag Health state measuring plug-in module for a computer interface and method of use
USRE45129E1 (en) 1998-09-08 2014-09-09 Roche Diagnostics International Ag Module for a computer interface

Also Published As

Publication number Publication date
CA989928A (en) 1976-05-25
BE790267A (fr) 1973-04-19

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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