GB504802A - Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields - Google Patents

Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields

Info

Publication number
GB504802A
GB504802A GB29818/37A GB2981837A GB504802A GB 504802 A GB504802 A GB 504802A GB 29818/37 A GB29818/37 A GB 29818/37A GB 2981837 A GB2981837 A GB 2981837A GB 504802 A GB504802 A GB 504802A
Authority
GB
United Kingdom
Prior art keywords
polepieces
magnets
horseshoe
flanges
permanent magnet
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
GB29818/37A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB29818/37A priority Critical patent/GB504802A/en
Priority to US237398A priority patent/US2200039A/en
Publication of GB504802A publication Critical patent/GB504802A/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

Abstract

504,802. Electron lenses. NICOLL, F. H. Nov. 1, 1937, No. 29818. [Class 39 (i)] [Also in Group XXXV] A permanent magnet device for focusing a composite beam of electrons by means of an axially symmetrical field, comprises two or more coaxial magnetic polepieces spaced longitudinally from each other and having an aperture through which the beam passes, the gap or gaps between the polepieces, which may be adjustable, being straddled by a plurality of permanent magnets arranged symmetrically about the axis of the polepieces with like poles of each magnet associated with the respective polepiece. The magnets may be either of bar form, in which case the polepieces have flanges of magnetic material between which the bars fit, or of horseshoe form, in which case either or both of the polepieces may have flanges serving as end shields. In the forms shown, 1, 2, 2a are soft iron cylindrical cores bridged by horseshoe or bar magnets 6, 6a, the electrons passing near the axis 8. Magnetic flanges 3, 4 may be threaded to allow movement of one of the polepieces for adjustment of the air gap 7. The multi-gap form shown in Fig. 6, may be modified by substituting for the horseshoe magnets bar magnets supported by an additional flange on the core 2a. Numerical data are given.
GB29818/37A 1937-11-01 1937-11-01 Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields Expired GB504802A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB29818/37A GB504802A (en) 1937-11-01 1937-11-01 Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields
US237398A US2200039A (en) 1937-11-01 1938-10-28 Permanent magnet device for producing axially symmetrical magnetic fields

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29818/37A GB504802A (en) 1937-11-01 1937-11-01 Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields

Publications (1)

Publication Number Publication Date
GB504802A true GB504802A (en) 1939-05-01

Family

ID=10297664

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29818/37A Expired GB504802A (en) 1937-11-01 1937-11-01 Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields

Country Status (2)

Country Link
US (1) US2200039A (en)
GB (1) GB504802A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE943548C (en) * 1944-05-31 1956-05-24 Siemens Ag Electron microscope with two permanently magnetically excited imaging lenses

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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
US2551544A (en) * 1944-09-20 1951-05-01 Alfred O C Nicr Mass spectrometer
US2572600A (en) * 1947-01-17 1951-10-23 Arthur J Dempster Mass spectrograph
BE487122A (en) * 1948-02-07
US2513929A (en) * 1948-05-21 1950-07-04 Gen Electric Beam centering device for cathode-ray tubes
NL147275B (en) * 1948-07-01 Plessey Uk Limited ELECTRIC TORQUE SWITCH FOR PUSH-BUTTON CONTROL.
US2542271A (en) * 1948-07-24 1951-02-20 Maria De Reitzes Marienwert Device for creating oscillations
NL148036B (en) * 1948-08-10 Ugine Kuhlmann PROCESS FOR PREPARING VINYL FLUORIDE FROM ETHYN AND HYDROGEN FLUORIDE.
US2539569A (en) * 1948-09-02 1951-01-30 Dudley B Clark Acyclic generator
GB670431A (en) * 1949-02-24 1952-04-16 Patrick Richard James Court Magnetic focussing device for cathode ray tubes
US2499065A (en) * 1949-03-22 1950-02-28 Heppner Mfg Company Device for adjustably positioning spaced magnetic fields
US2553039A (en) * 1949-04-26 1951-05-15 Zenith Radio Corp Cathode-ray tube combined beam centering and deflection device
US2579273A (en) * 1949-05-21 1951-12-18 Rca Corp Magnetic lens for electron optical systems
US2533687A (en) * 1949-05-27 1950-12-12 Quam Nichols Company Magnetic focusing device
GB665230A (en) * 1949-07-06 1952-01-16 Ferguson Radio Corp Improvements relating to cathode ray tubes
US2596214A (en) * 1949-07-13 1952-05-13 Charles F Orvis Co Inc Fly box
US2580355A (en) * 1949-10-08 1951-12-25 Du Mont Allen B Lab Inc Ion trap magnet
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
US2608665A (en) * 1950-07-29 1952-08-26 Gen Electric Permanent magnet focusing device
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
US2619607A (en) * 1951-03-10 1952-11-25 Glaser Steers Corp Internal focusing device
US2580606A (en) * 1951-03-21 1952-01-01 Best Mfg Company Inc Cathode-ray tube focusing device
US2701321A (en) * 1951-07-16 1955-02-01 Sperry Corp Adjustable magnetic focusing system for beam tubes
BE521065A (en) * 1952-07-01
US2904720A (en) * 1952-11-22 1959-09-15 Bell John Stewart Ion accelerator
US2825840A (en) * 1953-01-29 1958-03-04 Itt Traveling wave electron discharge devices
US2797360A (en) * 1953-03-26 1957-06-25 Int Standard Electric Corp Travelling wave amplifiers
US2847607A (en) * 1953-04-29 1958-08-12 Bell Telephone Labor Inc Magnetic focusing system
DE1071237B (en) * 1953-04-29
US2844754A (en) * 1953-04-29 1958-07-22 Bell Telephone Labor Inc Electron beam focusing system
US2855537A (en) * 1953-04-29 1958-10-07 Bell Telephone Labor Inc Electron beam focusing
US2867745A (en) * 1953-10-07 1959-01-06 Bell Telephone Labor Inc Periodic magnetic focusing system
US2769110A (en) * 1954-01-21 1956-10-30 Rca Corp Electron beam control means
BE540784A (en) * 1954-08-26
NL198576A (en) * 1954-08-26
NL200488A (en) * 1954-09-22
NL200862A (en) * 1954-10-04
BE546040A (en) * 1955-03-15
NL210816A (en) * 1955-09-22
US2849634A (en) * 1956-07-09 1958-08-26 Vickers Electrical Co Ltd Linear electron accelerators
US2919381A (en) * 1956-07-25 1959-12-29 Farrand Optical Co Inc Electron lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE943548C (en) * 1944-05-31 1956-05-24 Siemens Ag Electron microscope with two permanently magnetically excited imaging lenses

Also Published As

Publication number Publication date
US2200039A (en) 1940-05-07

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