ES376311A1 - Cathode-ray tube provided with at least one electron gun for producing a number of individually prefocused electron beams - Google Patents

Cathode-ray tube provided with at least one electron gun for producing a number of individually prefocused electron beams

Info

Publication number
ES376311A1
ES376311A1 ES376311A ES376311A ES376311A1 ES 376311 A1 ES376311 A1 ES 376311A1 ES 376311 A ES376311 A ES 376311A ES 376311 A ES376311 A ES 376311A ES 376311 A1 ES376311 A1 ES 376311A1
Authority
ES
Spain
Prior art keywords
grid
electrodes
focusing
cathode
individually
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
ES376311A
Other languages
Spanish (es)
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 ES376311A1 publication Critical patent/ES376311A1/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

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

In a colour television tube of the shadow mask type wherein three co-planar beams pass at different radial positions through a common focusing/converging lens, the pre-focusing effect of electrodes preceding the common lens is weaker for the outer beams than for the centre beam to compensate for the stronger focusing effect of the common lens on the outer beams. In Fig. 3 the three cathodes 6-8 are aligned with respective apertures in the first three grids 9, 30 and 34, and the pre-focusing effect of these electrodes is increased for the centre beam by the bulge in the centre of the second grid 30. In a modification, Fig. 2 (not shown), the second grid (13) is flat and the central aperture in the third grid (17) is smaller than the two outer apertures. The main lens comprises electrodes 24 and 25, and the third grid 34 is provided with an annular bulge 28 having the same diameter as the end portion 26 of the fourth grid. If the three guns have independent electrodes the required differences in pre-focusing may be achieved by using different potentials on the electrodes of the various guns.
ES376311A 1969-02-08 1970-02-06 Cathode-ray tube provided with at least one electron gun for producing a number of individually prefocused electron beams Expired ES376311A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6902024.A NL163364C (en) 1969-02-08 1969-02-08 Apparatus having an electron beam tube for color reproduction, as well as electron beam tube as part thereof.

Publications (1)

Publication Number Publication Date
ES376311A1 true ES376311A1 (en) 1972-06-16

Family

ID=19806092

Family Applications (1)

Application Number Title Priority Date Filing Date
ES376311A Expired ES376311A1 (en) 1969-02-08 1970-02-06 Cathode-ray tube provided with at least one electron gun for producing a number of individually prefocused electron beams

Country Status (7)

Country Link
US (1) US3610991A (en)
BE (1) BE745655A (en)
DE (1) DE2002809C3 (en)
ES (1) ES376311A1 (en)
FR (1) FR2034028A5 (en)
GB (1) GB1243163A (en)
NL (1) NL163364C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883771A (en) * 1969-03-07 1975-05-13 Akio Ohgoshi Collinear electron gun system including accelerating grid having greater effective thickness for off axis beams
US3852608A (en) * 1971-03-22 1974-12-03 Philips Corp Cathode-ray tube having an astigmatic lens element in its electron gun
US3873879A (en) * 1972-01-14 1975-03-25 Rca Corp In-line electron gun

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863091A (en) * 1956-03-07 1958-12-02 Rca Corp Flat tri-color kinescopes
US2887598A (en) * 1956-04-16 1959-05-19 Rca Corp Plural gun cathode ray tube
GB1195598A (en) * 1967-01-14 1970-06-17 Sony Corp Cathode Ray Tube
GB1226614A (en) * 1967-07-10 1971-03-31
US3546525A (en) * 1969-01-21 1970-12-08 Sony Corp Electron gun electrical connection apparatus

Also Published As

Publication number Publication date
GB1243163A (en) 1971-08-18
US3610991A (en) 1971-10-05
NL6902024A (en) 1970-08-11
FR2034028A5 (en) 1970-12-04
DE2002809C3 (en) 1979-12-06
DE2002809A1 (en) 1970-09-03
BE745655A (en) 1970-08-06
NL163364B (en) 1980-03-17
DE2002809B2 (en) 1979-04-05
NL163364C (en) 1980-08-15

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