FR2246057A1 - Electronic cathode-ray tube circuit - reduces the electric potential applied to the focussing electrodes when the beam current increases - Google Patents

Electronic cathode-ray tube circuit - reduces the electric potential applied to the focussing electrodes when the beam current increases

Info

Publication number
FR2246057A1
FR2246057A1 FR7428367A FR7428367A FR2246057A1 FR 2246057 A1 FR2246057 A1 FR 2246057A1 FR 7428367 A FR7428367 A FR 7428367A FR 7428367 A FR7428367 A FR 7428367A FR 2246057 A1 FR2246057 A1 FR 2246057A1
Authority
FR
France
Prior art keywords
electrodes
ray tube
beam current
reduces
electric potential
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.)
Withdrawn
Application number
FR7428367A
Other languages
French (fr)
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.)
Allard Way Holdings Ltd
Original Assignee
Elliott Brothers London Ltd
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 Elliott Brothers London Ltd filed Critical Elliott Brothers London Ltd
Publication of FR2246057A1 publication Critical patent/FR2246057A1/en
Withdrawn legal-status Critical Current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
    • H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
    • 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
    • H01J29/96—One or more circuit elements structurally associated with the tube
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • 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
    • H01J2229/4824—Constructional arrangements of electrodes
    • H01J2229/4827—Electrodes formed on surface of common cylindrical support

Landscapes

  • Details Of Television Scanning (AREA)

Abstract

The electronic cathode-ray tube circuit has a cathode-ray tube (1) with the usual electrodes (5, 7, 8, 9) including focusing electrodes (9). The focusing electrodes (9) are connected to a graphite layer (10) inside the tube which is turn connected to a high resistance helicoidal layer (11) and to an aluminium layer (12). The focussing electrodes (9) are connected to a power supply (20) through a resistor (12). The value of the resistor (12) is such that when the current supplied to the focussing electrodes (9) changes with the tube luminance or the beam current, the polarising potential to the electrodes (9) changes so as to reduce the variations and thus maintain an optimal potential.
FR7428367A 1973-08-16 1974-08-14 Electronic cathode-ray tube circuit - reduces the electric potential applied to the focussing electrodes when the beam current increases Withdrawn FR2246057A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3868573 1973-08-16

Publications (1)

Publication Number Publication Date
FR2246057A1 true FR2246057A1 (en) 1975-04-25

Family

ID=10405048

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7428367A Withdrawn FR2246057A1 (en) 1973-08-16 1974-08-14 Electronic cathode-ray tube circuit - reduces the electric potential applied to the focussing electrodes when the beam current increases

Country Status (2)

Country Link
FR (1) FR2246057A1 (en)
IL (1) IL45478A0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5254903A (en) * 1991-07-10 1993-10-19 Samsung Electron Devices, Co., Ltd. Cathode ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5254903A (en) * 1991-07-10 1993-10-19 Samsung Electron Devices, Co., Ltd. Cathode ray tube

Also Published As

Publication number Publication date
IL45478A0 (en) 1974-11-29

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Legal Events

Date Code Title Description
ST Notification of lapse