FR2409595A1 - Magnetically deflected CRT electron gun - has magnetic and non-magnetic two=part first accelerating electrode for minimising non-uniform beam focussing - Google Patents

Magnetically deflected CRT electron gun - has magnetic and non-magnetic two=part first accelerating electrode for minimising non-uniform beam focussing

Info

Publication number
FR2409595A1
FR2409595A1 FR7832333A FR7832333A FR2409595A1 FR 2409595 A1 FR2409595 A1 FR 2409595A1 FR 7832333 A FR7832333 A FR 7832333A FR 7832333 A FR7832333 A FR 7832333A FR 2409595 A1 FR2409595 A1 FR 2409595A1
Authority
FR
France
Prior art keywords
magnetic
electron gun
uniform beam
accelerating electrode
minimising
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.)
Granted
Application number
FR7832333A
Other languages
French (fr)
Other versions
FR2409595B1 (en
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Publication of FR2409595A1 publication Critical patent/FR2409595A1/en
Application granted granted Critical
Publication of FR2409595B1 publication Critical patent/FR2409595B1/fr
Granted 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
    • H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

The electron gun is for magnetically deflected CRT's esp. colour TV tubes. The gun minimises spot defocussing or non-uniform beam focussing which can arise from deviation of the beam away from the lens axis. The gun is bipotential and consists of a mult-electrode electrostatic lens, including a cathode, control and screen grids and two accelerating electrodes. The focussing system lies between these two electrodes. The first accelerating electrode is of two parts, that facing the screen grid being of magnetic material the remaining half being non-magnetic.
FR7832333A 1977-11-17 1978-11-16 Magnetically deflected CRT electron gun - has magnetic and non-magnetic two=part first accelerating electrode for minimising non-uniform beam focussing Granted FR2409595A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85245077A 1977-11-17 1977-11-17

Publications (2)

Publication Number Publication Date
FR2409595A1 true FR2409595A1 (en) 1979-06-15
FR2409595B1 FR2409595B1 (en) 1984-02-10

Family

ID=25313363

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7832333A Granted FR2409595A1 (en) 1977-11-17 1978-11-16 Magnetically deflected CRT electron gun - has magnetic and non-magnetic two=part first accelerating electrode for minimising non-uniform beam focussing

Country Status (4)

Country Link
CA (1) CA1108683A (en)
FR (1) FR2409595A1 (en)
IT (1) IT1099542B (en)
MX (1) MX148052A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0276952A2 (en) * 1987-01-26 1988-08-03 Hitachi, Ltd. Electron gun for colour picture tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4952186A (en) * 1989-10-24 1990-08-28 Rca Licensing Corporation Method of making a color picture tube electron gun with reduced convergence drift
US5010271A (en) * 1989-10-24 1991-04-23 Rca Licensing Corporation Color picture tube having an electron gun with reduced convergence drift

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3020434A (en) * 1958-12-08 1962-02-06 Philco Corp Self shielding electron gun and cathode ray tube system including same
US3047758A (en) * 1959-12-01 1962-07-31 Machlett Laboraotries Inc Cathode ray tubes
US3873879A (en) * 1972-01-14 1975-03-25 Rca Corp In-line electron gun

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3020434A (en) * 1958-12-08 1962-02-06 Philco Corp Self shielding electron gun and cathode ray tube system including same
US3047758A (en) * 1959-12-01 1962-07-31 Machlett Laboraotries Inc Cathode ray tubes
US3873879A (en) * 1972-01-14 1975-03-25 Rca Corp In-line electron gun

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0276952A2 (en) * 1987-01-26 1988-08-03 Hitachi, Ltd. Electron gun for colour picture tube
EP0276952A3 (en) * 1987-01-26 1989-07-12 Hitachi, Ltd. Electron gun for colour picture tube

Also Published As

Publication number Publication date
MX148052A (en) 1983-03-09
FR2409595B1 (en) 1984-02-10
IT7829155A0 (en) 1978-10-26
IT1099542B (en) 1985-09-18
CA1108683A (en) 1981-09-08

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Legal Events

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