US2218702A - Electron device - Google Patents

Electron device Download PDF

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Publication number
US2218702A
US2218702A US308379A US30837939A US2218702A US 2218702 A US2218702 A US 2218702A US 308379 A US308379 A US 308379A US 30837939 A US30837939 A US 30837939A US 2218702 A US2218702 A US 2218702A
Authority
US
United States
Prior art keywords
electrode
lens
cathode
screen
tube
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 - Lifetime
Application number
US308379A
Other languages
English (en)
Inventor
Diels Kurt
Knoll Max
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2218702A publication Critical patent/US2218702A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
    • C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
    • C07C5/27—Rearrangement of carbon atoms in the hydrocarbon skeleton
    • C07C5/31—Rearrangement of carbon atoms in the hydrocarbon skeleton changing the number of rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/123—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/137—Acids or hydroxy compounds containing cycloaliphatic rings
    • 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
    • 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

Definitions

  • the present invention relates to a simple arrangement for producing an extremely small luminous electron spot of high brilliance and sharpness which retains these properties even 5 when the beam undergoes modulation.
  • the arrangement according to the invention is especially well suited for high voltage cathode ray tubes for television purposes.
  • a known arrangement requiring a smaller number'of electrodes consists for instance of a cathode surrounded'by a Wehnelt. cylinder, an
  • object of our invention is to provide a new and improved cathode ray tube.
  • Another object of my invention is to provide a much simplified cathode ray tube structure capable of giving increased definition and higher 15 beam currents than obtainable by known structures.
  • the invention solves the problem of providing a very minute and well defined point of crossing to be reproduced by'the main lens contrary to the existingprejudice regarding a single preliminary concentration lens.
  • a single preliminary concentration lens must have a high difiractive force and still be devoid of lens faults.
  • the requirements, which appear on the surface to be irreconcilable with each other, are fulfilled in accordance'with the invention, in that for the preliminary concentra tion lens only such a curvature of the equi-po tential surface is admitted as will still be-allowable in regard to the lens faults, especiallythe spherical aberration, and that at the same time the lens electrode of the preliminary concentration lens which has the lower potential is followed directly bythe electrode which imparts to the electrons the end velocity.
  • the cathode In the described system, only a minor part of the cathode has emission owing to the high field intensity. At the control region the field intensity increases rapidly and the cathode receives thereby a very high specific load. The cathode area'participating in the emission thereby varies butslightly so that the crossing point changes are substantially nil.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US308379A 1938-09-20 1939-12-09 Electron device Expired - Lifetime US2218702A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2218702X 1938-09-20

Publications (1)

Publication Number Publication Date
US2218702A true US2218702A (en) 1940-10-22

Family

ID=7990706

Family Applications (1)

Application Number Title Priority Date Filing Date
US308379A Expired - Lifetime US2218702A (en) 1938-09-20 1939-12-09 Electron device

Country Status (4)

Country Link
US (1) US2218702A (en))
BE (1) BE436428A (en))
FR (1) FR861283A (en))
NL (1) NL98611C (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999185A (en) * 1950-01-09 1961-09-05 Harry R Lubcke Television device
US3035199A (en) * 1957-11-29 1962-05-15 Gen Dynamics Corp Lens deflection in the electro optical system of a cathode ray tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999185A (en) * 1950-01-09 1961-09-05 Harry R Lubcke Television device
US3035199A (en) * 1957-11-29 1962-05-15 Gen Dynamics Corp Lens deflection in the electro optical system of a cathode ray tube

Also Published As

Publication number Publication date
NL98611C (en))
BE436428A (en))
FR861283A (fr) 1941-02-05

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