GB556372A - Improvements in and relating to electron lenses - Google Patents

Improvements in and relating to electron lenses

Info

Publication number
GB556372A
GB556372A GB9058/42A GB905842A GB556372A GB 556372 A GB556372 A GB 556372A GB 9058/42 A GB9058/42 A GB 9058/42A GB 905842 A GB905842 A GB 905842A GB 556372 A GB556372 A GB 556372A
Authority
GB
United Kingdom
Prior art keywords
cathode
lens
electrode
electron
july
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
GB9058/42A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB556372A publication Critical patent/GB556372A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/02—Details
    • H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement or ion-optical arrangement
    • H01J37/10—Lenses
    • H01J37/12—Lenses electrostatic

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Electron Beam Exposure (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)

Abstract

556,372. Electron lenses. BRITISH THOMSONHOUSTON CO., Ltd. July 1, 1942, No. 9058. Convention date, July 2, 1941. [Class 39 (i)] An electron lens with low spherical aberration comprises a tubular central electrode 26, Fig. 1, and rounded end electrodes 25, 27 shaped as surfaces of revolution with their convex ends facing each other. In the ideal case the surfaces are generated from the product of a hyperbolic and a Bessel function, but a sufficient approximation is given by surfaces built up of one or two spherical sections. As shown in Fig. 6, the tubular electrode may be a cylindrical passage 41 in a thick disc 40 and the rounded surfaces may be projections 45, 46 on end discs 43, 44. An electron microscope using the lens comprises a cathode 15, shield 16, anode 18, object holder 24 of mesh supported in an apertured disc 22, lens 25, 26, 27, and screen 12. Members 18, 22, 25, 27 are conductively connected to an earthed metal envelope 10, which carries at one end a window 11 for the screen 12, at the other end a seal 14 for the cathode and at the side a seal 30 for the lead and support of electrode 26, which may thus be kept, as shown, at cathode potential.
GB9058/42A 1941-07-02 1942-07-01 Improvements in and relating to electron lenses Expired GB556372A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US400809A US2277414A (en) 1941-07-02 1941-07-02 Electron lens

Publications (1)

Publication Number Publication Date
GB556372A true GB556372A (en) 1943-10-01

Family

ID=23585112

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9058/42A Expired GB556372A (en) 1941-07-02 1942-07-01 Improvements in and relating to electron lenses

Country Status (2)

Country Link
US (1) US2277414A (en)
GB (1) GB556372A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522196A1 (en) * 1982-02-22 1983-08-26 Philips Nv CATHODE RAY TUBE WITH REDUCED SPHERICAL ABERRATION

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL83700C (en) * 1942-03-24
FR977800A (en) * 1942-11-17 1951-04-05 Cfcmug Improvements to projection equipment for television
FR964837A (en) * 1942-12-01 1950-08-25
US2520813A (en) * 1947-12-10 1950-08-29 Rudenberg Reinhold Electron optical system
US2719243A (en) * 1951-07-03 1955-09-27 Du Mont Allen B Lab Inc Electrostatic electron lens
US3243646A (en) * 1961-09-11 1966-03-29 Nippon Columbia Cylindrical compensating electrode for electrostatic lens of cathode ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522196A1 (en) * 1982-02-22 1983-08-26 Philips Nv CATHODE RAY TUBE WITH REDUCED SPHERICAL ABERRATION

Also Published As

Publication number Publication date
US2277414A (en) 1942-03-24

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