GB521439A - Focussing magnets for cathode ray tubes - Google Patents

Focussing magnets for cathode ray tubes

Info

Publication number
GB521439A
GB521439A GB42338A GB42338A GB521439A GB 521439 A GB521439 A GB 521439A GB 42338 A GB42338 A GB 42338A GB 42338 A GB42338 A GB 42338A GB 521439 A GB521439 A GB 521439A
Authority
GB
United Kingdom
Prior art keywords
constriction
ray tubes
cathode ray
cathode
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
GB42338A
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.)
Kolster Brandes Ltd
Original Assignee
Kolster Brandes 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 Kolster Brandes Ltd filed Critical Kolster Brandes Ltd
Priority to GB42338A priority Critical patent/GB521439A/en
Priority to NL91093A priority patent/NL54993C/xx
Priority to FR848180D priority patent/FR848180A/en
Publication of GB521439A publication Critical patent/GB521439A/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
    • H01J29/66—Magnetic lenses using electromagnetic means only

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

521,439. Cathode-ray tubes. KOLSTERBRANDES, Ltd., and SMYTH, C. N. Nov. 18, 1938, No. 423. [Class 39 (i)] Focusing in a cathode-ray tube is effected by an electromagnet whose poles G for producing the focusing flux are supported by a constriction S ; an auxiliary air gap GS of higher reluctance than the main gap localizes the major part of the leakage when the constriction is saturated. The length of the constriction is great compared with the air gap GS. A magnetic tube T slidable in the core adjusts the main flux.
GB42338A 1938-11-18 1938-11-18 Focussing magnets for cathode ray tubes Expired GB521439A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB42338A GB521439A (en) 1938-11-18 1938-11-18 Focussing magnets for cathode ray tubes
NL91093A NL54993C (en) 1938-11-18 1938-12-15
FR848180D FR848180A (en) 1938-11-18 1938-12-30 Cathode ray apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB42338A GB521439A (en) 1938-11-18 1938-11-18 Focussing magnets for cathode ray tubes

Publications (1)

Publication Number Publication Date
GB521439A true GB521439A (en) 1940-05-22

Family

ID=9704087

Family Applications (1)

Application Number Title Priority Date Filing Date
GB42338A Expired GB521439A (en) 1938-11-18 1938-11-18 Focussing magnets for cathode ray tubes

Country Status (3)

Country Link
FR (1) FR848180A (en)
GB (1) GB521439A (en)
NL (1) NL54993C (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US2533688A (en) * 1950-01-31 1950-12-12 Quam Nichols Company Focusing device
US2568668A (en) * 1950-08-18 1951-09-18 Best Mfg Co Inc Cathode-ray tube focusing device of the permanent magnet type
US2580606A (en) * 1951-03-21 1952-01-01 Best Mfg Company Inc Cathode-ray tube focusing device
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
US2594099A (en) * 1950-04-22 1952-04-22 Ite Circuit Breaker Ltd Focusing coil for cathode-ray tubes
GB2471943A (en) * 2009-07-16 2011-01-19 Vg Systems Ltd Magnetic lens, method for focussing charged particles and charged particle energy analyser
EP2827356A1 (en) * 2013-07-18 2015-01-21 Fei Company Magnetic lens for focusing a beam of charged particles

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE893100C (en) * 1941-03-27 1953-10-12 Siemens Reiniger Werke Ag Electric discharge tubes, in particular X-ray tubes
DE943548C (en) * 1944-05-31 1956-05-24 Siemens Ag Electron microscope with two permanently magnetically excited imaging lenses
GB670431A (en) * 1949-02-24 1952-04-16 Patrick Richard James Court Magnetic focussing device for cathode ray tubes

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533687A (en) * 1949-05-27 1950-12-12 Quam Nichols Company Magnetic focusing device
US2533688A (en) * 1950-01-31 1950-12-12 Quam Nichols Company Focusing device
US2594099A (en) * 1950-04-22 1952-04-22 Ite Circuit Breaker Ltd Focusing coil for 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
US2580606A (en) * 1951-03-21 1952-01-01 Best Mfg Company Inc Cathode-ray tube focusing device
GB2471943A (en) * 2009-07-16 2011-01-19 Vg Systems Ltd Magnetic lens, method for focussing charged particles and charged particle energy analyser
GB2471943B (en) * 2009-07-16 2011-10-19 Vg Systems Ltd Magnetic lens, method for focussing charged particles and charged particle energy analyser
EP2827356A1 (en) * 2013-07-18 2015-01-21 Fei Company Magnetic lens for focusing a beam of charged particles
US9595359B2 (en) 2013-07-18 2017-03-14 Fei Company Magnetic lens for focusing a beam of charged particles

Also Published As

Publication number Publication date
FR848180A (en) 1939-10-24
NL54993C (en) 1943-08-16

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