GB868836A - Improvements in or relating to apparatus including a permanent magnet - Google Patents

Improvements in or relating to apparatus including a permanent magnet

Info

Publication number
GB868836A
GB868836A GB612459A GB612459A GB868836A GB 868836 A GB868836 A GB 868836A GB 612459 A GB612459 A GB 612459A GB 612459 A GB612459 A GB 612459A GB 868836 A GB868836 A GB 868836A
Authority
GB
United Kingdom
Prior art keywords
shielding member
magnet
permanent magnet
feb
saturated
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
GB612459A
Inventor
Thomas Cayton Nuttall
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.)
Bush and Rank Cintel Ltd
Original Assignee
Bush and Rank Cintel 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 Bush and Rank Cintel Ltd filed Critical Bush and Rank Cintel Ltd
Priority to GB612459A priority Critical patent/GB868836A/en
Publication of GB868836A publication Critical patent/GB868836A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

868,836. Cathode-ray tubes. BUSH & RANK CINTEL Ltd. Feb. 23, 1960 [Feb. 23, 1959], No. 6124/59. Class 39(1). A permanent magnet in a cathode ray tube apparatus is provided with a ferromagnetic shielding member for limiting stray fields of the magnet, the shielding member being of a form such that if of uniform thickness it would in part be saturated by the field, but the thickness of the shielding member being so varied that it is nowhere saturated. As shown the magnet 2 with pole pieces 3, 4 is provided with shielding member 8 formed of a plurality of concentric tubes of decreasing length. Alternatively the shielding member may comprise a tube having a wall thickness decreasing from a maximum in the region of the magnet to a minimum remote therefrom.
GB612459A 1959-02-23 1959-02-23 Improvements in or relating to apparatus including a permanent magnet Expired GB868836A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB612459A GB868836A (en) 1959-02-23 1959-02-23 Improvements in or relating to apparatus including a permanent magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB612459A GB868836A (en) 1959-02-23 1959-02-23 Improvements in or relating to apparatus including a permanent magnet

Publications (1)

Publication Number Publication Date
GB868836A true GB868836A (en) 1961-05-25

Family

ID=9808851

Family Applications (1)

Application Number Title Priority Date Filing Date
GB612459A Expired GB868836A (en) 1959-02-23 1959-02-23 Improvements in or relating to apparatus including a permanent magnet

Country Status (1)

Country Link
GB (1) GB868836A (en)

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