GB757755A - Improvements in magnetic focussing devices for cathode-ray tubes - Google Patents

Improvements in magnetic focussing devices for cathode-ray tubes

Info

Publication number
GB757755A
GB757755A GB1419454A GB1419454A GB757755A GB 757755 A GB757755 A GB 757755A GB 1419454 A GB1419454 A GB 1419454A GB 1419454 A GB1419454 A GB 1419454A GB 757755 A GB757755 A GB 757755A
Authority
GB
United Kingdom
Prior art keywords
pole
sheath
cathode
magnet
piece
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
GB1419454A
Inventor
Arthur James Tyrrell
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.)
Mullard Radio Valve Co Ltd
Original Assignee
Mullard Radio Valve 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 Mullard Radio Valve Co Ltd filed Critical Mullard Radio Valve Co Ltd
Priority to GB1419454A priority Critical patent/GB757755A/en
Publication of GB757755A publication Critical patent/GB757755A/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]

Landscapes

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

Abstract

757,755. Cathode-ray tubes. MULLARD RADIO VALVE CO., Ltd. May 14, 1954, No. 14194/54. Class 39 (1). A magnetic focusing device for a cathode-ray tube comprises a U-sectioned sheath of soft ferromagnetic material, the two parts 1, 2 of which are relatively adjustable axially as by threaded parts 4 and enclosing a hollow cylindrical permanent magnet 8 axially magnetized, one end of the magnet being secured to one end wall of the sheath so that one pole is produced at the end wall of the sheath and the other pole is formed at the free end of the magnet or by a separate pole-piece 12 between the legs of the sheath. The pole-piece 12 is secured to magnet 8 by adhesive and the spacing between members 12, 2 can be adjusted by soft iron shims between 8 and 2. Sheath part 1 becomes a pole-piece of the same polarity as member 2. The design is such as to concentrate the field at the axis and to reduce stray fields as far as possible.
GB1419454A 1954-05-14 1954-05-14 Improvements in magnetic focussing devices for cathode-ray tubes Expired GB757755A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1419454A GB757755A (en) 1954-05-14 1954-05-14 Improvements in magnetic focussing devices for cathode-ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1419454A GB757755A (en) 1954-05-14 1954-05-14 Improvements in magnetic focussing devices for cathode-ray tubes

Publications (1)

Publication Number Publication Date
GB757755A true GB757755A (en) 1956-09-26

Family

ID=10036743

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1419454A Expired GB757755A (en) 1954-05-14 1954-05-14 Improvements in magnetic focussing devices for cathode-ray tubes

Country Status (1)

Country Link
GB (1) GB757755A (en)

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