GB731978A - Improvements in or relating to magnetic focussing devices for cathode ray tubes - Google Patents

Improvements in or relating to magnetic focussing devices for cathode ray tubes

Info

Publication number
GB731978A
GB731978A GB351653A GB351653A GB731978A GB 731978 A GB731978 A GB 731978A GB 351653 A GB351653 A GB 351653A GB 351653 A GB351653 A GB 351653A GB 731978 A GB731978 A GB 731978A
Authority
GB
United Kingdom
Prior art keywords
magnets
ray tubes
plate
relating
feb
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
GB351653A
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.)
JOHN EDWARD LEVI
EK Cole Ltd
Original Assignee
JOHN EDWARD LEVI
EK Cole 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 JOHN EDWARD LEVI, EK Cole Ltd filed Critical JOHN EDWARD LEVI
Priority to GB351653A priority Critical patent/GB731978A/en
Publication of GB731978A publication Critical patent/GB731978A/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

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

731,978. Cathode-ray tubes. COLE, Ltd., E. K., and LEVI, J. E. Feb. 8, 1954 [Feb. 7, 1953], No. 3516/53. Class 39 (1). Parallel annular focusing magnets are mounted on separate frames, one of which is slidable in the direction' of the magnet axis. Magnets A, C are fixed to supports B, D by an adhesive and projections B1, support D being slidable on two parallel rods H and adjusted by a threaded Archimedean screw J which is fastened to the plate B by the split pin T. Adjustable lugs E are used to support the arrangement. The screw J is gripped by two rods K which are stressed towards each other at the ends and are mounted with the frame D. Additional adjustment of the beam is provided by a magnetic annular plate held within a depression of a plate N and which is frictionally rotatable against a resilient strip S which is fastened to the frame B. The magnets are of ferromagnetic ferrite, axially magnetized, with the adjacent faces of like polarity.
GB351653A 1953-02-07 1953-02-07 Improvements in or relating to magnetic focussing devices for cathode ray tubes Expired GB731978A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB351653A GB731978A (en) 1953-02-07 1953-02-07 Improvements in or relating to magnetic focussing devices for cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB351653A GB731978A (en) 1953-02-07 1953-02-07 Improvements in or relating to magnetic focussing devices for cathode ray tubes

Publications (1)

Publication Number Publication Date
GB731978A true GB731978A (en) 1955-06-15

Family

ID=9759804

Family Applications (1)

Application Number Title Priority Date Filing Date
GB351653A Expired GB731978A (en) 1953-02-07 1953-02-07 Improvements in or relating to magnetic focussing devices for cathode ray tubes

Country Status (1)

Country Link
GB (1) GB731978A (en)

Similar Documents

Publication Publication Date Title
GB810267A (en) Focusing magnet for long electron beams
GB605341A (en) Electron focusing apparatus
GB615553A (en) Improvements in or relating to devices for focusing an electron beam
GB786988A (en) Improvements in or relating to electron tube arrangements including magnetic focussing systems
GB731978A (en) Improvements in or relating to magnetic focussing devices for cathode ray tubes
GB691156A (en) Improvements in or relating to corpuscular ray apparatus
GB1426243A (en) Permanent magnet lens
GB729840A (en) Improvements in magnetic electron lenses
GB792020A (en) Improvements in or relating to the magnetic focusing of electron beams
GB814892A (en) Improvements in or relating to means for shifting the electron beam of a cathode raytube
GB847266A (en) Improvements relating to electron lenses
GB699739A (en) Improvements relating to cathode ray tubes
GB834542A (en) Improvements in or relating to a cathode ray tube arrangement
GB757755A (en) Improvements in magnetic focussing devices for cathode-ray tubes
GB731451A (en) Improvements in or relating to arrangements for use with cathode ray tubes
GB783603A (en) Improvements in or relating to magnet arrangements
GB890843A (en) Electron tube magnetic focussing device
GB670431A (en) Magnetic focussing device for cathode ray tubes
GB776515A (en) Improvements in or relating to ion trap arrangements
GB977465A (en) Improvements relating to arrangements comprising magnetic deflecting assemblies for cathode-ray tubes
GB846897A (en) Magnetic electron lenses
GB827968A (en) Improvements in magnetic focussing devices for cathode-ray tubes
GB920231A (en) Electro-magnetic lens assembly
JPS55163754A (en) Yoke assembly for image pickup tube
GB918732A (en) Magnetic-focusing systems for travelling-wave tubes