GB505601A - Improvements in or relating to electron lenses - Google Patents

Improvements in or relating to electron lenses

Info

Publication number
GB505601A
GB505601A GB31330/37A GB3133037A GB505601A GB 505601 A GB505601 A GB 505601A GB 31330/37 A GB31330/37 A GB 31330/37A GB 3133037 A GB3133037 A GB 3133037A GB 505601 A GB505601 A GB 505601A
Authority
GB
United Kingdom
Prior art keywords
lens
electron
diameter
coaxial rings
short
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
Application number
GB31330/37A
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.)
Zeiss Ikon AG
Original Assignee
Zeiss Ikon 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 Zeiss Ikon AG filed Critical Zeiss Ikon AG
Publication of GB505601A publication Critical patent/GB505601A/en
Expired 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

Landscapes

  • Electron Beam Exposure (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

505,601. Electron lenses. ZEISS IKON AKT.-GES. Nov.16, 1937, No. 31330. Convention date, Dec. 18, 1936. Drawings to Specification. [Class 39 (i)] Chromatic aberration in an electron lens ia removed by introducing an oppositely directed spherical aberration,; this is possible if, as is stated to be the case, the electron velocity in a beam of electrons increases with the angle of emission and hence with the distance from, the axis. Preferably the diameter of the electron rav is made to exceed half the diameter of the lens. In one form the lens. is a series of short coaxial rings maintained at steadily increasing potentials by tappings on a voltage divider. In anotherform, a short magnetic lens having small spherical error is followed by an electrostatic lens of two coaxial rings, the potential of the first being variable to enable the spherical error to be adjusted.
GB31330/37A 1936-12-18 1937-11-15 Improvements in or relating to electron lenses Expired GB505601A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE505601X 1936-12-18

Publications (1)

Publication Number Publication Date
GB505601A true GB505601A (en) 1939-05-15

Family

ID=6546403

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31330/37A Expired GB505601A (en) 1936-12-18 1937-11-15 Improvements in or relating to electron lenses

Country Status (2)

Country Link
US (1) US2209159A (en)
GB (1) GB505601A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2406704A (en) * 2003-09-30 2005-04-06 Ims Nanofabrication Gmbh Particle-optic electrostatic lens

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540621A (en) * 1948-02-19 1951-02-06 Rca Corp Electron gun structure
US2835838A (en) * 1953-07-18 1958-05-20 Philips Corp Cathode-ray tube
US3240973A (en) * 1962-03-01 1966-03-15 Rca Corp Electrostatic saddle field collimating system
US5159240A (en) * 1991-12-09 1992-10-27 Chunghwa Picture Tubes, Ltd. Low voltage limiting aperture electron gun
US5223764A (en) * 1991-12-09 1993-06-29 Chunghwa Picture Tubes, Ltd. Electron gun with low voltage limiting aperture main lens
US5220239A (en) * 1991-12-09 1993-06-15 Chunghwa Picture Tubes, Ltd. High density electron beam generated by low voltage limiting aperture gun
US5182492A (en) * 1992-05-20 1993-01-26 Chunghwa Picture Tubes, Ltd. Electron beam shaping aperture in low voltage, field-free region of electron gun

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2406704A (en) * 2003-09-30 2005-04-06 Ims Nanofabrication Gmbh Particle-optic electrostatic lens
GB2406704B (en) * 2003-09-30 2007-02-07 Ims Nanofabrication Gmbh Particle-optic electrostatic lens
US7199373B2 (en) 2003-09-30 2007-04-03 Ims Nanofabrication Gmbh Particle-optic electrostatic lens

Also Published As

Publication number Publication date
US2209159A (en) 1940-07-23

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