GB1216584A - Directly heated cathode - Google Patents

Directly heated cathode

Info

Publication number
GB1216584A
GB1216584A GB4548/68A GB454868A GB1216584A GB 1216584 A GB1216584 A GB 1216584A GB 4548/68 A GB4548/68 A GB 4548/68A GB 454868 A GB454868 A GB 454868A GB 1216584 A GB1216584 A GB 1216584A
Authority
GB
United Kingdom
Prior art keywords
cathode
central portion
reduced width
portions
electrical connection
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
Application number
GB4548/68A
Inventor
Donald R Kerstetter
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
Publication of GB1216584A publication Critical patent/GB1216584A/en
Expired legal-status Critical Current

Links

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
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/18—Supports; Vibration-damping arrangements

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

1,216,584. Cathode-ray tubes. SYLVANIA ELECTRIC PRODUCTS Inc. 29 Jan., 1968 [1 Feb., 1967], No. 4548/68. Heading H1D. A directly heated cathode 13 which is freely suspended in an electron gun for a C.R.T. comprises a circular planar central portion 14 with an electron emissive coating 15 on one face, a first reduced width portion 16 extending radially from the central portion 14 to a first support 27 to provide a first electrical connection to the cathode, and a second similar reduced width portion 16<SP>1</SP> extending, diametrically opposite the first portion 16, from the central portion 14 to second support 27<SP>1</SP> to provide a second electrical connection. Both reduced width portions 16 and 16<SP>1</SP> have similar cross-sections such that they provide sufficient resistance heating and thermal isolation for the cathode. The cathode is preferably secured by enlarged portions 17, 17<SP>1</SP> at the end of reduced portions 16, 16<SP>1</SP> to supports 27, 27<SP>1</SP> by the suspension arrangement described in Specification 1,216,583. The central portion 14 of the cathode is preferably of larger diameter than aperture 25 in associated electrode 23 of the electron gun. Specific dimensions of an example are given.
GB4548/68A 1967-02-01 1968-01-29 Directly heated cathode Expired GB1216584A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61315067A 1967-02-01 1967-02-01

Publications (1)

Publication Number Publication Date
GB1216584A true GB1216584A (en) 1970-12-23

Family

ID=24456075

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4548/68A Expired GB1216584A (en) 1967-02-01 1968-01-29 Directly heated cathode

Country Status (2)

Country Link
US (1) US3441767A (en)
GB (1) GB1216584A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541382A (en) * 1967-12-11 1970-11-17 Tokyo Shibaura Electric Co Direct heated cathode member for an electron tube
DE2037874B2 (en) * 1970-07-30 1972-12-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt METHOD OF MAKING A SUPPLY CATHOD
NL7014337A (en) * 1970-09-30 1972-04-05
JPS5353409Y2 (en) * 1972-03-22 1978-12-20
US4259610A (en) * 1977-09-12 1981-03-31 Tokyo Shibaura Denki Kabushiki Kaisha Electron gun assembly for cathode ray tubes and method of assembling the same
JPS6023455B2 (en) * 1978-10-17 1985-06-07 株式会社東芝 Directly heated cathode structure
JPS55102146A (en) * 1979-01-31 1980-08-05 Toshiba Corp Directly-heated cathode structure
US4388551A (en) * 1980-11-24 1983-06-14 Zenith Radio Corporation Quick-heating cathode structure

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1863152A (en) * 1929-11-11 1932-06-14 Gen Talking Pictures Corp Exciter lamp
GB524240A (en) * 1939-01-25 1940-08-01 Werner Ehrenberg Improvements in or relating to cathodes for electron discharge devices
US2491995A (en) * 1948-06-26 1949-12-20 Westinghouse Electric Corp Electron beam tube
US2879431A (en) * 1956-09-04 1959-03-24 Sylvania Electric Prod Lamp
US3274425A (en) * 1964-07-31 1966-09-20 Welding Research Inc Filament for electron gun

Also Published As

Publication number Publication date
US3441767A (en) 1969-04-29

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