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GB472165A - 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
GB472165A
GB472165A GB729736A GB729736A GB472165A GB 472165 A GB472165 A GB 472165A GB 729736 A GB729736 A GB 729736A GB 729736 A GB729736 A GB 729736A GB 472165 A GB472165 A GB 472165A
Authority
GB
United Kingdom
Prior art keywords
tube
magnet
cylinder
shunt
cathode
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
GB729736A
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 GB729736A priority Critical patent/GB472165A/en
Publication of GB472165A publication Critical patent/GB472165A/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

Landscapes

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

Abstract

472,165. Cathode - ray tubes. FERRANTI, Ltd., and TAYLOR, M. K. March 11, 1936, No. 7297. [Class 39 (i)] To form a magnetic lens in a cathode-ray tube a permanent magnet is used whose inner surface is in the form of a right cylinder a, Fig. 1, or a truncated cone a, Fig. 3. The magnet may be adjustable along the tube b by screw means p, q. It may be supported from a brass cylinder f, Fig. 1, by a rubber inset g which allows the magnet to be rocked about the tube by adjusting screws i, j, the rubber acting as a pivot. A shunt for varying the magnetic field is formed by ferro-magnetic strip c wound on a cylinder of paper impregnated with resin, the shunt being slidable axially ; a wire coil may replace the strip and it may be supported on a brass tube. The magnet may be formed of one or more rings of alloy of iron nickel and aluminium with polepieces of high permeability.
GB729736A 1936-03-11 1936-03-11 Improvements in or relating to focusing systems for electron beams Expired GB472165A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB729736A GB472165A (en) 1936-03-11 1936-03-11 Improvements in or relating to focusing systems for electron beams

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB729736A GB472165A (en) 1936-03-11 1936-03-11 Improvements in or relating to focusing systems for electron beams

Publications (1)

Publication Number Publication Date
GB472165A true GB472165A (en) 1937-09-13

Family

ID=9830402

Family Applications (1)

Application Number Title Priority Date Filing Date
GB729736A Expired GB472165A (en) 1936-03-11 1936-03-11 Improvements in or relating to focusing systems for electron beams

Country Status (1)

Country Link
GB (1) GB472165A (en)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416687A (en) * 1944-03-30 1947-03-04 Bell Telephone Labor Inc Magnetic focussing device
US2418487A (en) * 1944-03-31 1947-04-08 Bell Telephone Labor Inc Cathode ray magnetic focusing device
US2431077A (en) * 1943-08-31 1947-11-18 Rca Corp Cathode-ray tube with revolving magnets and adjustable sleeve
US2442975A (en) * 1943-08-31 1948-06-08 Rca Corp Focusing system
US2446674A (en) * 1944-02-18 1948-08-10 Bell Telephone Labor Inc Cathode-ray device mounting
US2456399A (en) * 1945-10-24 1948-12-14 Gen Electric Cathode-ray apparatus
US2494459A (en) * 1945-11-09 1950-01-10 Rca Corp Cathode-ray beam deflector
US2497078A (en) * 1945-03-15 1950-02-14 James E Gall Tube mount
US2501516A (en) * 1947-12-31 1950-03-21 Gen Electric Deflecting and focusing device for cathode-ray apparatus
US2533688A (en) * 1950-01-31 1950-12-12 Quam Nichols Company Focusing device
US2533687A (en) * 1949-05-27 1950-12-12 Quam Nichols Company Magnetic focusing device
US2533689A (en) * 1950-06-28 1950-12-12 Quam Nichols Company Magnetic focusing device
US2563525A (en) * 1951-08-07 Image size control device for
US2568668A (en) * 1950-08-18 1951-09-18 Best Mfg Co Inc Cathode-ray tube focusing device of the permanent magnet type
US2569327A (en) * 1948-08-31 1951-09-25 Rca Corp Electron beam bender
US2581657A (en) * 1950-07-26 1952-01-08 Myron R Heppner Focusing and centering device for cathode-ray tubes
US2592185A (en) * 1950-12-09 1952-04-08 Quam Nichols Company Focusing device
US2602902A (en) * 1950-02-14 1952-07-08 Bendix Aviat Corp Sweep amplitude control for magnetically deflected cathode-ray tubes
US2623095A (en) * 1949-09-14 1952-12-23 Pye Ltd Suspension arrangement for cathode-ray tubes
US2733364A (en) * 1956-01-31 flory
US2749464A (en) * 1952-09-13 1956-06-05 Hartford Nat Bank & Trust Co Adjustable magnetic electronic lens

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563525A (en) * 1951-08-07 Image size control device for
US2733364A (en) * 1956-01-31 flory
US2431077A (en) * 1943-08-31 1947-11-18 Rca Corp Cathode-ray tube with revolving magnets and adjustable sleeve
US2442975A (en) * 1943-08-31 1948-06-08 Rca Corp Focusing system
US2446674A (en) * 1944-02-18 1948-08-10 Bell Telephone Labor Inc Cathode-ray device mounting
US2416687A (en) * 1944-03-30 1947-03-04 Bell Telephone Labor Inc Magnetic focussing device
US2418487A (en) * 1944-03-31 1947-04-08 Bell Telephone Labor Inc Cathode ray magnetic focusing device
US2497078A (en) * 1945-03-15 1950-02-14 James E Gall Tube mount
US2456399A (en) * 1945-10-24 1948-12-14 Gen Electric Cathode-ray apparatus
US2494459A (en) * 1945-11-09 1950-01-10 Rca Corp Cathode-ray beam deflector
US2501516A (en) * 1947-12-31 1950-03-21 Gen Electric Deflecting and focusing device for cathode-ray apparatus
US2569327A (en) * 1948-08-31 1951-09-25 Rca Corp Electron beam bender
US2533687A (en) * 1949-05-27 1950-12-12 Quam Nichols Company Magnetic focusing device
US2623095A (en) * 1949-09-14 1952-12-23 Pye Ltd Suspension arrangement for cathode-ray tubes
US2533688A (en) * 1950-01-31 1950-12-12 Quam Nichols Company Focusing device
US2602902A (en) * 1950-02-14 1952-07-08 Bendix Aviat Corp Sweep amplitude control for magnetically deflected cathode-ray tubes
US2533689A (en) * 1950-06-28 1950-12-12 Quam Nichols Company Magnetic focusing device
US2581657A (en) * 1950-07-26 1952-01-08 Myron R Heppner Focusing and centering device for cathode-ray tubes
US2568668A (en) * 1950-08-18 1951-09-18 Best Mfg Co Inc Cathode-ray tube focusing device of the permanent magnet type
US2592185A (en) * 1950-12-09 1952-04-08 Quam Nichols Company Focusing device
US2749464A (en) * 1952-09-13 1956-06-05 Hartford Nat Bank & Trust Co Adjustable magnetic electronic lens

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