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GB486063A - Improvements in cathode ray tubes - Google Patents

Improvements in cathode ray tubes

Info

Publication number
GB486063A
GB486063A GB16388/37A GB1638837A GB486063A GB 486063 A GB486063 A GB 486063A GB 16388/37 A GB16388/37 A GB 16388/37A GB 1638837 A GB1638837 A GB 1638837A GB 486063 A GB486063 A GB 486063A
Authority
GB
United Kingdom
Prior art keywords
cathode
members
equal
apertured
electrode
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
GB16388/37A
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
Publication of GB486063A publication Critical patent/GB486063A/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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/62—Electrostatic lenses
    • H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
    • H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun

Landscapes

  • Apparatus For Radiation Diagnosis (AREA)

Abstract

486,063. Cathode-ray tubes. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. June 12, 1937, No. 16388. Convention date, June 15, 1936. [Class 39 (i)] A cathode-ray tube is provided with an electrostatic lens system comprising three or more tubular metal members surrounding the beam and mounted one behind the other with a small intermediate space, the adjacent end surfaces of each two successive members having the shape of equal flat annuli normal to the tube axis, whose radial width is at least equal to the distance between the surfaces, this distance being equal to or smaller than the internal diameter of the annuli. The lens system may consist of three tubular members 4 ... 6 of the shape shown, or they may be bobbin-shaped or hollow members with annular end faces. The cathode comprises a bifilar heating wire 10 on a support 11 surrounded by a cylinder 12, the closed end of which is coated with emissive material. The control electrode 13 is in the form of an apertured cylindrical member and the first anode 14 is an apertured disc connected to the electrode 5 and operated at 200 volts with respect to the cathode. The electrodes 4, 6 are connected together and operated at 500 volts with respect to the cathode. Suitable dimensions for the electrodes 4 .. 6 are given in the Specification and the electrode 6 may be provided with an apertured end diaphragm 15.
GB16388/37A 1936-06-15 1937-06-12 Improvements in cathode ray tubes Expired GB486063A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE486063X 1936-06-15

Publications (1)

Publication Number Publication Date
GB486063A true GB486063A (en) 1938-05-30

Family

ID=6543386

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16388/37A Expired GB486063A (en) 1936-06-15 1937-06-12 Improvements in cathode ray tubes

Country Status (2)

Country Link
FR (1) FR823035A (en)
GB (1) GB486063A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS563948A (en) * 1979-06-22 1981-01-16 Hitachi Ltd Electrostatic focusing type pickup tube

Also Published As

Publication number Publication date
FR823035A (en) 1938-01-12

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