GB453214A - Improvements in or relating to indirectly heated cathodes for electron discharge tubes - Google Patents

Improvements in or relating to indirectly heated cathodes for electron discharge tubes

Info

Publication number
GB453214A
GB453214A GB3435734A GB3435734A GB453214A GB 453214 A GB453214 A GB 453214A GB 3435734 A GB3435734 A GB 3435734A GB 3435734 A GB3435734 A GB 3435734A GB 453214 A GB453214 A GB 453214A
Authority
GB
United Kingdom
Prior art keywords
electron
relating
emitting material
around
discharge tubes
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
GB3435734A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Priority to GB3435734A priority Critical patent/GB453214A/en
Publication of GB453214A publication Critical patent/GB453214A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Discharge Lamp (AREA)

Abstract

453,214. Thermionic cathodes. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, Emmasingel, Eindhoven, Holland. Nov. 29,1934, No. 34357. Void [Abridged as open to inspection under Sect. 91 of the Acts, June 11, 1935]. [Class 39 (i)] In an indirectly-heated cathode the heater and the electron-emitting material are insulated from each other and are connected by a material having good conducting or conveying properties. As shown in Fig. 1, the electron-emitting material 4 is arranged around one end of a copper body 1, and the heating coil 2 is mounted on mica 3 around the other end ; or the material 4 may be arranged in a slot in the end of the body. A reflecting cylinder 6 surrounds the heater and the body 1, but not the material 4. As shown in Fig. 3, heat is conveyed to the electron-emitting material 12 on a glass tube 10 by mercury vapour, a heating coil 11 for the mercury 13 being mounted around the outer end of the tube.
GB3435734A 1934-11-29 1934-11-29 Improvements in or relating to indirectly heated cathodes for electron discharge tubes Expired GB453214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3435734A GB453214A (en) 1934-11-29 1934-11-29 Improvements in or relating to indirectly heated cathodes for electron discharge tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3435734A GB453214A (en) 1934-11-29 1934-11-29 Improvements in or relating to indirectly heated cathodes for electron discharge tubes

Publications (1)

Publication Number Publication Date
GB453214A true GB453214A (en) 1935-06-11

Family

ID=10364628

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3435734A Expired GB453214A (en) 1934-11-29 1934-11-29 Improvements in or relating to indirectly heated cathodes for electron discharge tubes

Country Status (1)

Country Link
GB (1) GB453214A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE744011C (en) * 1938-08-16 1944-01-07 Hermann Papst Indirectly heated rod-shaped glow cathode for electron tubes
US2567624A (en) * 1946-09-03 1951-09-11 Thomson Amherst Felix Home Cathode arrangement for electron discharge devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE744011C (en) * 1938-08-16 1944-01-07 Hermann Papst Indirectly heated rod-shaped glow cathode for electron tubes
US2567624A (en) * 1946-09-03 1951-09-11 Thomson Amherst Felix Home Cathode arrangement for electron discharge devices

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