GB522377A - Improvements in or relating to focusing systems for electron beams - Google Patents

Improvements in or relating to focusing systems for electron beams

Info

Publication number
GB522377A
GB522377A GB3563338A GB3563338A GB522377A GB 522377 A GB522377 A GB 522377A GB 3563338 A GB3563338 A GB 3563338A GB 3563338 A GB3563338 A GB 3563338A GB 522377 A GB522377 A GB 522377A
Authority
GB
United Kingdom
Prior art keywords
relating
electron beams
focusing systems
group
outer periphery
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
GB3563338A
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.)
Ferranti International PLC
Original Assignee
Ferranti PLC
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 Ferranti PLC filed Critical Ferranti PLC
Priority to GB3563338A priority Critical patent/GB522377A/en
Publication of GB522377A publication Critical patent/GB522377A/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
    • H01J29/64—Magnetic lenses
    • H01J29/68—Magnetic lenses using permanent magnets only

Abstract

522,377. Permanent magnets. FERRANTI, Ltd., TAYLOR, M. K., and WOOD, H. Dec. 7, 1938, No. 35633. [Class 35] [Also in Group XL] A magnet 1 for use in focusing in a cathode ray tube is annular and of opposite polarity at its outer periphery to its inner periphery. It may be concave and of various cross sections ; it may have pole-pieces on its inner or outer periphery and carry pieces 22 of magnetic material for correction of astigmatism. It may be an alloy of iron nickel and aluminium with or without cobalt. Specification 472,165, [Group XL], is referred to.
GB3563338A 1938-12-07 1938-12-07 Improvements in or relating to focusing systems for electron beams Expired GB522377A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3563338A GB522377A (en) 1938-12-07 1938-12-07 Improvements in or relating to focusing systems for electron beams

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3563338A GB522377A (en) 1938-12-07 1938-12-07 Improvements in or relating to focusing systems for electron beams

Publications (1)

Publication Number Publication Date
GB522377A true GB522377A (en) 1940-06-17

Family

ID=10379882

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3563338A Expired GB522377A (en) 1938-12-07 1938-12-07 Improvements in or relating to focusing systems for electron beams

Country Status (1)

Country Link
GB (1) GB522377A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976927C (en) * 1952-01-04 1964-08-06 Philips Nv Magnetic electron lens with adjustable focal length

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976927C (en) * 1952-01-04 1964-08-06 Philips Nv Magnetic electron lens with adjustable focal length

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