FR2392489A1 - CRT electron gun producing fine beam - generates fine spot on screen using third and fifth grid and small orifice in cap electrode (SF 31.1.79) - Google Patents

CRT electron gun producing fine beam - generates fine spot on screen using third and fifth grid and small orifice in cap electrode (SF 31.1.79)

Info

Publication number
FR2392489A1
FR2392489A1 FR7804795A FR7804795A FR2392489A1 FR 2392489 A1 FR2392489 A1 FR 2392489A1 FR 7804795 A FR7804795 A FR 7804795A FR 7804795 A FR7804795 A FR 7804795A FR 2392489 A1 FR2392489 A1 FR 2392489A1
Authority
FR
France
Prior art keywords
grid
electron gun
cap electrode
screen
small orifice
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Withdrawn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
FR7804795A
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of FR2392489A1 publication Critical patent/FR2392489A1/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Withdrawn legal-status Critical Current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
    • H01J29/58—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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/029—Schematic arrangements for beam forming

Landscapes

  • Electron Beam Exposure (AREA)

Abstract

An electron gun providing a fine beam for use in CRTs is designed to allow simplification of manufacture by use of third and fifth grid electrodes. The gun has an orthodox indirectly heated electron emitting surface (1, 2) and primary grids (10, 20). These are followed within the overall insulating enclosure (4) by three electrodes in the form of approximately 'U' shaped enclosures centered on the beam axis. The final or cap electrode has an orifice diameter less than that of the channel formed by the preceeding electrodes, their length being > 0.37 of the diameter of this channel.
FR7804795A 1977-05-25 1978-02-20 CRT electron gun producing fine beam - generates fine spot on screen using third and fifth grid and small orifice in cap electrode (SF 31.1.79) Withdrawn FR2392489A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5976877A JPS53145553A (en) 1977-05-25 1977-05-25 Electronic gun

Publications (1)

Publication Number Publication Date
FR2392489A1 true FR2392489A1 (en) 1978-12-22

Family

ID=13122783

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7804795A Withdrawn FR2392489A1 (en) 1977-05-25 1978-02-20 CRT electron gun producing fine beam - generates fine spot on screen using third and fifth grid and small orifice in cap electrode (SF 31.1.79)

Country Status (3)

Country Link
JP (1) JPS53145553A (en)
FI (1) FI780510A (en)
FR (1) FR2392489A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1149345A (en) * 1965-04-26 1969-04-23 Sony Corp Electron gun
US3732457A (en) * 1970-01-30 1973-05-08 Victor Co Ltd Electrode lens potential arrangement for a post-acceleration picture tube
FR2323225A1 (en) * 1975-09-08 1977-04-01 Hitachi Ltd In-line electron gun for multi-beam colour picture tubes - has two electrode grid structure with three aligned openings on each with corresponding long and short sleeves

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1149345A (en) * 1965-04-26 1969-04-23 Sony Corp Electron gun
US3732457A (en) * 1970-01-30 1973-05-08 Victor Co Ltd Electrode lens potential arrangement for a post-acceleration picture tube
FR2323225A1 (en) * 1975-09-08 1977-04-01 Hitachi Ltd In-line electron gun for multi-beam colour picture tubes - has two electrode grid structure with three aligned openings on each with corresponding long and short sleeves

Also Published As

Publication number Publication date
FI780510A (en) 1978-11-26
JPS53145553A (en) 1978-12-18

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Legal Events

Date Code Title Description
ST Notification of lapse