GB502796A - Improvements in or relating to cathode ray tubes - Google Patents

Improvements in or relating to cathode ray tubes

Info

Publication number
GB502796A
GB502796A GB2301937A GB2301937A GB502796A GB 502796 A GB502796 A GB 502796A GB 2301937 A GB2301937 A GB 2301937A GB 2301937 A GB2301937 A GB 2301937A GB 502796 A GB502796 A GB 502796A
Authority
GB
United Kingdom
Prior art keywords
cathode
members
ray tubes
elements
electrons
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
GB2301937A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2301937A priority Critical patent/GB502796A/en
Publication of GB502796A publication Critical patent/GB502796A/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
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/50—Plurality of guns or beams
    • H01J2229/507—Multi-beam groups, e.g. number of beams greater than number of cathodes

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

502,796. Cathode-ray tubes. McGEE, J. D. Aug. 23, 1937, No. 23019. [Class 39 (i)] In multiple-spot scanning, cathode-ray tubes for television &c. such as those described in Specification 432,485, the source of electrons is constituted by an indirectly heated cathode structure having separate emissive members 8 insulated from each other and from the heater 10 and provided with individual leads 9. Each member 8 serves as electron source for one scanning spot and is arranged opposite the space between transverse wires 5 welded or soldered across a long rectangular slot 4 in the cathode shield 3. The control potentials are applied through a timedelay circuit to the members 8, these members being biassed positively so that electrons do not pass from them through the slot 4 in the absence of the control potentials. The non-inductively wound heater 10 is arranged in a tube 6 of ceramic material or of metal coated with alumina or magnesia; in the latter case, the tube 6 is welded to the shield 3 through rods 11 and is maintained at constant potential to reduce electrostatic coupling between adjacent elements 8. The elements 8 consist of wound nickel strips sprayed with emissive oxides, and the spaces between the elements are protected by windings of cotton thread during the spraying.
GB2301937A 1937-08-23 1937-08-23 Improvements in or relating to cathode ray tubes Expired GB502796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2301937A GB502796A (en) 1937-08-23 1937-08-23 Improvements in or relating to cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2301937A GB502796A (en) 1937-08-23 1937-08-23 Improvements in or relating to cathode ray tubes

Publications (1)

Publication Number Publication Date
GB502796A true GB502796A (en) 1939-03-23

Family

ID=10188774

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2301937A Expired GB502796A (en) 1937-08-23 1937-08-23 Improvements in or relating to cathode ray tubes

Country Status (1)

Country Link
GB (1) GB502796A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030613A1 (en) * 1979-12-12 1981-06-24 International Business Machines Corporation Multiple beam cathode ray tube having improved cathode-grid structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030613A1 (en) * 1979-12-12 1981-06-24 International Business Machines Corporation Multiple beam cathode ray tube having improved cathode-grid structure

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