FR2288386A1 - CRT with constant magnetic focussing field - has electrostatic field to compensate variations in magnetic focussing - Google Patents

CRT with constant magnetic focussing field - has electrostatic field to compensate variations in magnetic focussing

Info

Publication number
FR2288386A1
FR2288386A1 FR7434512A FR7434512A FR2288386A1 FR 2288386 A1 FR2288386 A1 FR 2288386A1 FR 7434512 A FR7434512 A FR 7434512A FR 7434512 A FR7434512 A FR 7434512A FR 2288386 A1 FR2288386 A1 FR 2288386A1
Authority
FR
France
Prior art keywords
field
magnetic focussing
crt
focussing
magnetic
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
FR7434512A
Other languages
French (fr)
Other versions
FR2288386B1 (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.)
BALANDIN GENRIKH
Original Assignee
BALANDIN GENRIKH
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 BALANDIN GENRIKH filed Critical BALANDIN GENRIKH
Priority to FR7434512A priority Critical patent/FR2288386A1/en
Publication of FR2288386A1 publication Critical patent/FR2288386A1/en
Application granted granted Critical
Publication of FR2288386B1 publication Critical patent/FR2288386B1/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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • 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
    • H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching

Landscapes

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

Abstract

The cathode-ray tube has a magnetic lens of constant field strength to focus the electron beam, and an electrostatic lens to alter the beam energy such that changes in focussing due to variations in the magnetic lens field are compensated. The electrostatic lens consists of two acially separated electrodes (7, 8). The first electrode (7) is at the same potential as the accelerating electrodes (6) on the other side of the X-Y deflection plates, and the second electrode (8) is located inside the magnetic coil on the oppsoite side of the latter centre plane (14) away from the screen.
FR7434512A 1974-10-14 1974-10-14 CRT with constant magnetic focussing field - has electrostatic field to compensate variations in magnetic focussing Granted FR2288386A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7434512A FR2288386A1 (en) 1974-10-14 1974-10-14 CRT with constant magnetic focussing field - has electrostatic field to compensate variations in magnetic focussing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7434512A FR2288386A1 (en) 1974-10-14 1974-10-14 CRT with constant magnetic focussing field - has electrostatic field to compensate variations in magnetic focussing

Publications (2)

Publication Number Publication Date
FR2288386A1 true FR2288386A1 (en) 1976-05-14
FR2288386B1 FR2288386B1 (en) 1979-02-16

Family

ID=9144069

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7434512A Granted FR2288386A1 (en) 1974-10-14 1974-10-14 CRT with constant magnetic focussing field - has electrostatic field to compensate variations in magnetic focussing

Country Status (1)

Country Link
FR (1) FR2288386A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1331823A (en) * 1961-08-22 1963-07-05 Thomson Houston Comp Francaise Improvements to electronic optical devices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1331823A (en) * 1961-08-22 1963-07-05 Thomson Houston Comp Francaise Improvements to electronic optical devices

Also Published As

Publication number Publication date
FR2288386B1 (en) 1979-02-16

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Legal Events

Date Code Title Description
ST Notification of lapse