US3134042A - Cap-shaped cathode for cathode ray tubes - Google Patents

Cap-shaped cathode for cathode ray tubes Download PDF

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Publication number
US3134042A
US3134042A US7800A US780060A US3134042A US 3134042 A US3134042 A US 3134042A US 7800 A US7800 A US 7800A US 780060 A US780060 A US 780060A US 3134042 A US3134042 A US 3134042A
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US
United States
Prior art keywords
cathode
sleeve
cap
shaped
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
US7800A
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English (en)
Inventor
Sato Reiji
Yamaguchi Noboru
Takanashi Yukio
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.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Application granted granted Critical
Publication of US3134042A publication Critical patent/US3134042A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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

  • This invention relates to cathodes for electronic tubes, such as cathode ray tubes, travelling wave tubes, Klystrons, etc. More particularly the invention relates to cathode structures for cathode ray tubes for use in television receivers, especially in all transistor television receivers in which the cathodes are required to reach working temperatures very quickly in starting.
  • a standardized construction of conventional cathodes of this sort is that a cylindrical cathode body having a closed bottom is formed of a thin nickel plate material and is supported directly by a supporting disk made of an electrically insulating and refractory material.
  • a heater element disposed within the body when the cathode body is heated by a heater element disposed within the body, a large proportion of the heat will be directly conducted to the insulating disk, resulting in a considerable length of time for the cathode body to reach working temperature.
  • a cylindrical cathode body is fixed to an outer sleeve surrounding and spaced around the cathode body.
  • the cathode body is connected with the outer sleeve through a spider structure which is formed by a plurality of cut and inwardly projected arcuate portions of the outer sleeve arranged in a common lateral plane.
  • the cathode body is in contact with the inner ridge of the projected portions and welded thereto.
  • the outer sleeve is secured to the insulating supporting disk in a conventional manner.
  • the cathode body is not in direct heat-conducting contact with the supporting disc so that only a minor portion of the heat is transmitted to the supporting disk. Furthermore, the cathode body is supported by the outer sleeve through fine ribbon-shaped pieces, and the conduction of heat will be very low, resulting in a high thermal efficiency. On the other hand, the cathode body is connected with the outer sleeve through ribbon-shaped arcuate pieces at a plurality of peripheral positions, so that the cathode body is positively held in position and there will occur substantially no vibration nor displacement due to shocks during operation.
  • Another object of the persent invention is to provide a cap-shaped cathode for an electronic tube, characterized by a preferably disk-shaped electrically insulating supporting plate, a thin-walled metallic cylindrical sleeve supported by said supporting plate, a cathode body of thinwalled metallic cylinder concentrically disposed within said sleeve and adapted to receive a heater element therewithin,
  • FIGURE 1 is a side view of a cathode embodying the present invention
  • FIGURE 2 is a cross-sectional view taken along line 22 of FIGURE 1;
  • FIGURE 3 is a side view of another embodiment of the present invention.
  • a preferably disk-shaped supporting plate 10 made of an electrically insulating refractory material such as, for example, steatite, has a central circular hole 12 for receiving an outer sleeve 11.
  • the outer sleeve 11 is a thin-walled metallic cylinder and is fitted in the circular hole 12 and is secured to the disk 10 by means of beads 13 and 14 formed by the conventional beading art.
  • Three circumferentially-spaced elongated portions 15, 16 and 17 located in a common plane adjacent to the upper end of the sleeve 11 and lateral to the axis of the latter are cut from the sleeve along their longitudinal sides, and deformed inwardly into substantially arcuate shapes, thus forming a spider shaped supporting member integral with the sleeve 11 for supporting the cathode body.
  • the inner ridges of the supporting members 15, 16 and 17 of the spider are in contact with a cathode body 18 inserted therebetween.
  • the supporting members are welded to the cathode body.
  • the cathode body 18 is constituted by a nickel cylinder having a closed bottom as is usual in the art.
  • the cathode body is adapted to receive therein a heater element, not shown, in a manner known in the art.
  • a cathode lead of nickel ribbon 19 is welded to the outer sleeve 11.
  • Nickel cathode cylinder 18
  • a cathode ray tube embodying the present cathode has brought about favorable results when used in all-transistor television receivers, in which the heater rating of the cathode was 12 v., 0.075 a. These numerical values are satisfactory when dry cells are employed as electrical sources.
  • the outer sleeve 11 may be made of nickel, but it has been discovered that one made of Kovar operates more favorably.
  • cut and a projected arms 20 and 21 are provided near both the upper and lower ends of the outer sleeve 23, respectively.
  • several upper and lower cut and inwardly deformed supporting arms are formed, and the cathode body 22 is welded totheir inward ridges.
  • the structure is same as is shown in FIG- URES land 2.
  • 24 designates the insulating supporting disk, and 25 is the sleeve tab.
  • a cathode structure for electronic tubes comprising an electrically insulating refractory disc having an opening therethrough, a hollow sleeve in said opening and attached to said disc, and a cathode within said sleeve, said sleeve being provided with a plurality of spaced slits to define portions therebetween, said portions being inwardly directed to contact and support said cathode.
  • a cathode structure as claimed in claim 1 wherein said cathode and sleeve extend through said disc, said sleeve having opposite ends, said sleeve includes said portions at both said ends, said cathode being supported by said sleeve at both said ends.
  • a cathode structure for an electronic tube comprising an insulating refractory disc having an opening extending therethrough, a hollow sleeve extending through said opening and secured to the disc, and a cathode having a substantial portion of the length thereof projecting within the sleeve, said sleeve having opposite ends, said sleeve including integral inwardly deformed portions, arranged in a common plane between the disc and at least one of said ends of the sleeve, contacting and supporting the cathode.

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  • Electrodes For Cathode-Ray Tubes (AREA)
US7800A 1959-02-19 1960-02-10 Cap-shaped cathode for cathode ray tubes Expired - Lifetime US3134042A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3134042X 1959-02-19

Publications (1)

Publication Number Publication Date
US3134042A true US3134042A (en) 1964-05-19

Family

ID=18040863

Family Applications (1)

Application Number Title Priority Date Filing Date
US7800A Expired - Lifetime US3134042A (en) 1959-02-19 1960-02-10 Cap-shaped cathode for cathode ray tubes

Country Status (2)

Country Link
US (1) US3134042A (fr)
NL (1) NL248618A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156160A (en) * 1977-07-08 1979-05-22 Gte Sylvania Incorporated Cathode support assembly structure and fabrication
US4644219A (en) * 1984-02-29 1987-02-17 Siemens Aktiengesellschaft Beam generating system for electron tubes, particularly travelling wave tubes

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2413689A (en) * 1942-02-12 1947-01-07 Bell Telephone Labor Inc Electron discharge device
US2414137A (en) * 1944-02-29 1947-01-14 Philco Corp Electron tube
US2717325A (en) * 1952-04-08 1955-09-06 Int Standard Electric Corp Indirectly heated cathode, for cathode ray tubes in particular
US2726346A (en) * 1952-01-25 1955-12-06 Rca Corp Indirectly heated cathode of increased efficiency
US2732512A (en) * 1956-01-24 briggs
US2859371A (en) * 1954-04-09 1958-11-04 Gen Electric Electron discharge device structure
US2875367A (en) * 1954-10-22 1959-02-24 Gen Electric Cathode structures

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732512A (en) * 1956-01-24 briggs
US2413689A (en) * 1942-02-12 1947-01-07 Bell Telephone Labor Inc Electron discharge device
US2414137A (en) * 1944-02-29 1947-01-14 Philco Corp Electron tube
US2726346A (en) * 1952-01-25 1955-12-06 Rca Corp Indirectly heated cathode of increased efficiency
US2717325A (en) * 1952-04-08 1955-09-06 Int Standard Electric Corp Indirectly heated cathode, for cathode ray tubes in particular
US2859371A (en) * 1954-04-09 1958-11-04 Gen Electric Electron discharge device structure
US2875367A (en) * 1954-10-22 1959-02-24 Gen Electric Cathode structures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156160A (en) * 1977-07-08 1979-05-22 Gte Sylvania Incorporated Cathode support assembly structure and fabrication
US4644219A (en) * 1984-02-29 1987-02-17 Siemens Aktiengesellschaft Beam generating system for electron tubes, particularly travelling wave tubes

Also Published As

Publication number Publication date
NL248618A (fr)

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