GB822485A - Improvements in or relating to electron lenses - Google Patents

Improvements in or relating to electron lenses

Info

Publication number
GB822485A
GB822485A GB34410/55A GB3441055A GB822485A GB 822485 A GB822485 A GB 822485A GB 34410/55 A GB34410/55 A GB 34410/55A GB 3441055 A GB3441055 A GB 3441055A GB 822485 A GB822485 A GB 822485A
Authority
GB
United Kingdom
Prior art keywords
teeth
ring
magnets
profiled
edges
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
GB34410/55A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB822485A publication Critical patent/GB822485A/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

  • Prostheses (AREA)
  • Hard Magnetic Materials (AREA)
  • Particle Accelerators (AREA)

Abstract

822,485. Electron lenses. PHILIPS ELECTRICAL INDUSTRIES Ltd. Dec. 1, 1955 [Dec. 4, 1954] ,No. 34410/55. Class 39(1). [Also in Group XXXV] A permanent magnet electron lens in which the magnetic field strength can be varied comprises two oppositely magnetised annular magnets 3, 5 and two soft iron rings 7, 21, with profiled facing edges 17, 55, disposed between the magnets and rotatable relative to one another to vary the reluctance in the path of the magnetic flux. The profiled edge 17 of the ring 7 consists of a number of teeth which co-operate with a similar number of teeth or holes 55 in the ring 19, or both profiled edges may comprise cam-shaped surfaces. The outer edge of ring 7 may also be provided with teeth 25 for co-operation with holes or teeth 53 in an outer ring 27 for additional control of the magnetic flux. The edges of the ring 27 may be provided with teeth for co-operation with teeth provided in outer discs 9, 11. The magnets may be made from the ceramic material described in Specification 708,127 [Group XXXV] and rings 7, 19 and 27 may consist of nickel or ceramic materials instead of soft iron.
GB34410/55A 1954-12-04 1955-12-01 Improvements in or relating to electron lenses Expired GB822485A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL822485X 1954-12-04

Publications (1)

Publication Number Publication Date
GB822485A true GB822485A (en) 1959-10-28

Family

ID=19840915

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34410/55A Expired GB822485A (en) 1954-12-04 1955-12-01 Improvements in or relating to electron lenses

Country Status (5)

Country Link
US (1) US2873413A (en)
DE (1) DE1031442B (en)
FR (1) FR1139451A (en)
GB (1) GB822485A (en)
NL (1) NL86361C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB885251A (en) * 1958-05-13 1961-12-20 Mullard Ltd Improvements in permanent magnet systems
US3146191A (en) * 1961-05-12 1964-08-25 Indiana General Corp Variable magnetic strength permanent magnetic drum
US3387158A (en) * 1965-04-14 1968-06-04 Sony Corp Focus magnet assembly for cathode ray tubes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2333230A (en) * 1940-12-24 1943-11-02 O S Walker Co Inc Magnetic chuck
US2369769A (en) * 1942-09-04 1945-02-20 American Viscose Corp Apparatus for the liquid treatment of yarn and the like
US2608665A (en) * 1950-07-29 1952-08-26 Gen Electric Permanent magnet focusing device
US2714678A (en) * 1950-09-03 1955-08-02 Siemens Ag Electron microscopes
BE522315A (en) * 1952-08-26

Also Published As

Publication number Publication date
FR1139451A (en) 1957-07-01
NL86361C (en)
DE1031442B (en) 1958-06-04
US2873413A (en) 1959-02-10

Similar Documents

Publication Publication Date Title
GB1305651A (en)
GB1512315A (en) Switchable permanent magnetic holding devices
GB810267A (en) Focusing magnet for long electron beams
GB860439A (en) Improvements in or relating to magnetic arrangements
ES279189A1 (en) A magnetic suspension device for a rotor (Machine-translation by Google Translate, not legally binding)
GB1095242A (en) Magnetic holding device
GB1454754A (en) Permanent magnet structure
GB1451956A (en) Travelling wave tubes
GB822485A (en) Improvements in or relating to electron lenses
GB1325344A (en) Magnet actuating arrangements for magneto sensitive devices
ES410589A1 (en) Magnet assembly
ES416435A1 (en) Stacked magnetic arrangement
GB1294472A (en) Pulse generating devices
GB1408685A (en) Electromagnets
JPS5553164A (en) Permanent magnet rotor
GB1226698A (en)
FR2267649A1 (en) Permanent magnet electric machines - has pole pieces with parts having different remanence and coercive fields
GB766857A (en) Improvements in or relating to magnetic electron lenses
GB852714A (en) Improvements in or relating to magnetic gripping devices
GB887143A (en) Improvements relating to variable speed ratio coupling devices
GB980119A (en) Periodic magnetic focusing arrangements for electron beam tubes
GB778585A (en) Improvements in or relating to magnet systems
GB759389A (en) Improvements in or relating to magnetic rotary couplings
GB835271A (en) Periodic magnetic electron beam focusing arrangement
GB1365611A (en) Magnetically operable multiple reed contact unit