GB827968A - Improvements in magnetic focussing devices for cathode-ray tubes - Google Patents

Improvements in magnetic focussing devices for cathode-ray tubes

Info

Publication number
GB827968A
GB827968A GB679256A GB679256A GB827968A GB 827968 A GB827968 A GB 827968A GB 679256 A GB679256 A GB 679256A GB 679256 A GB679256 A GB 679256A GB 827968 A GB827968 A GB 827968A
Authority
GB
United Kingdom
Prior art keywords
axially
magnets
ray tube
cathode ray
focusing
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
GB679256A
Inventor
Anthony William Simpson
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.)
Plessey Co Ltd
Original Assignee
Plessey 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB679256A priority Critical patent/GB827968A/en
Publication of GB827968A publication Critical patent/GB827968A/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

827,968. Electron beam focusing apparatus. PLESSEY CO. Ltd. Feb. 25, 1957 [March 5, 1956], No. 6792/56. Class 39(1). [Also in Group XXXV] A magnetic focusing device for a cathode ray tube comprises two coaxial annular per manently axially magnetised magnets 1, 2 of moulded plastic bound powdered ferroceramic material which are adjustable axially with respect to one another, the magnets being magnetised in the same direction. The adjusting means which is incorporated in the mounting brackets 3, 4 comprises three bolts 5 with adjustable nuts 6, 8 which are opposed by springs 9. The three nuts 6, 8 can be coupled by means 10 to give equal nut movements. Bracket 3 is secured to the television or other cathode ray tube chassis. The cross section of magnet rings 1, 2 need not be square as shown, and rings 1 and 2 can have different individual cross sections. A prior art device comprising two sintered ferro-magnetic ceramic permanent magnets oppositely poled and relatively movable axially for focusing, is referred to.
GB679256A 1956-03-05 1956-03-05 Improvements in magnetic focussing devices for cathode-ray tubes Expired GB827968A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB679256A GB827968A (en) 1956-03-05 1956-03-05 Improvements in magnetic focussing devices for cathode-ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB679256A GB827968A (en) 1956-03-05 1956-03-05 Improvements in magnetic focussing devices for cathode-ray tubes

Publications (1)

Publication Number Publication Date
GB827968A true GB827968A (en) 1960-02-10

Family

ID=9820844

Family Applications (1)

Application Number Title Priority Date Filing Date
GB679256A Expired GB827968A (en) 1956-03-05 1956-03-05 Improvements in magnetic focussing devices for cathode-ray tubes

Country Status (1)

Country Link
GB (1) GB827968A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2403627A1 (en) * 1973-01-26 1974-08-01 Thomson Csf CONCENTRATING DEVICE FOR AN ELECTRON TUBE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2403627A1 (en) * 1973-01-26 1974-08-01 Thomson Csf CONCENTRATING DEVICE FOR AN ELECTRON TUBE

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