GB438343A - Improvements relating to indirectly heated cathodes for cathode ray tubes - Google Patents

Improvements relating to indirectly heated cathodes for cathode ray tubes

Info

Publication number
GB438343A
GB438343A GB20691/35A GB2069135A GB438343A GB 438343 A GB438343 A GB 438343A GB 20691/35 A GB20691/35 A GB 20691/35A GB 2069135 A GB2069135 A GB 2069135A GB 438343 A GB438343 A GB 438343A
Authority
GB
United Kingdom
Prior art keywords
tube
cathode
ray tubes
indirectly heated
july
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
GB20691/35A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB438343A publication Critical patent/GB438343A/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

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

438,343. Cathode-ray tubes. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London. July 20, 1935, No. 20691. Convention date, July 21, 1934. [Class 39 (i)] A cathode for a cathoderay tube consists of a nickel disc 3 carrying the electron emissive material heated wholly or mainly by conduction from a tungsten rod 2, which is in turn indirectly heated by a coil 7 mounted on a steatite insulating tube 8 surrounding the rod ; the spiral is attached to the tube by a cement consisting of aluminium oxide mixed with china clay. A nickel tube 1 encloses the heater and is welded to an upturned flange on the disc 3 ; the lower end of the tube 1 is closed by a diaphragm 5, through which pass the heater wires. A cap 4 with a small perforation for the electrons closes the top of the cathode. A support wire 6, which is attached to the tube 1, is made of poor heat-conducting material such as iron.
GB20691/35A 1934-07-21 1935-07-20 Improvements relating to indirectly heated cathodes for cathode ray tubes Expired GB438343A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE438343X 1934-07-21

Publications (1)

Publication Number Publication Date
GB438343A true GB438343A (en) 1935-11-14

Family

ID=6507153

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20691/35A Expired GB438343A (en) 1934-07-21 1935-07-20 Improvements relating to indirectly heated cathodes for cathode ray tubes

Country Status (1)

Country Link
GB (1) GB438343A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE749662C (en) * 1937-02-26 1944-11-29 Rod-shaped, indirectly heated cathode for Braun tubes
DE763222C (en) * 1938-08-23 1954-10-04 Siemens & Halske A G Indirectly heated glow cathode for electron beam tubes
US2892115A (en) * 1955-12-20 1959-06-23 Itt Cathode structures

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE749662C (en) * 1937-02-26 1944-11-29 Rod-shaped, indirectly heated cathode for Braun tubes
DE763222C (en) * 1938-08-23 1954-10-04 Siemens & Halske A G Indirectly heated glow cathode for electron beam tubes
US2892115A (en) * 1955-12-20 1959-06-23 Itt Cathode structures

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