GB766857A - Improvements in or relating to magnetic electron lenses - Google Patents

Improvements in or relating to magnetic electron lenses

Info

Publication number
GB766857A
GB766857A GB6177/55A GB617755A GB766857A GB 766857 A GB766857 A GB 766857A GB 6177/55 A GB6177/55 A GB 6177/55A GB 617755 A GB617755 A GB 617755A GB 766857 A GB766857 A GB 766857A
Authority
GB
United Kingdom
Prior art keywords
relating
march
edges
rings
electron lenses
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
GB6177/55A
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 GB766857A publication Critical patent/GB766857A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
    • 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

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Magnetic Treatment Devices (AREA)

Abstract

766,857. Magnetic structures; magnetizing permanent magnets. PHILIPS ELECTRICAL INDUSTRIES, Ltd. March 2, 1955 [March 5, 1954], No. 6177/55. Classes 35 and 38 (2). [Also in Group XL (a)] Two permanent ring magnets, preferably of " ferroxdure ", magnetized as in Fig. 1, form an electron lens. A ring 1, Fig. 4, is polarized by means of two coils 13, 14 so wound and/or with such a choice of turns that an oblique resultant field Hp is produced. The edges of the rings opposite the edges NS may be bevelled. The ratio of axial to radial thickness d/h is preferably 2/3 to 3/2. In the lens system a spring between the rings compensates magnetic field changes due to temperature.
GB6177/55A 1954-03-05 1955-03-02 Improvements in or relating to magnetic electron lenses Expired GB766857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL766857X 1954-03-05

Publications (1)

Publication Number Publication Date
GB766857A true GB766857A (en) 1957-01-23

Family

ID=19827648

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6177/55A Expired GB766857A (en) 1954-03-05 1955-03-02 Improvements in or relating to magnetic electron lenses

Country Status (5)

Country Link
US (1) US2799813A (en)
DE (1) DE1035812B (en)
FR (1) FR1120026A (en)
GB (1) GB766857A (en)
NL (1) NL87140C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL87342C (en) * 1952-01-04
US2943219A (en) * 1955-09-19 1960-06-28 Philco Corp Beam positioning apparatus for cathode ray tubes
US2888634A (en) * 1957-07-09 1959-05-26 Du Mont Allen B Lab Inc Electric circuit
NL7812540A (en) * 1978-12-27 1980-07-01 Philips Nv CATHED BEAM TUBE.
US4647887A (en) * 1984-12-24 1987-03-03 The United States Of America As Represented By The Secretary Of The Army Lightweight cladding for magnetic circuits
US5014028A (en) * 1990-04-25 1991-05-07 The United States Of America As Represented By The Secretary Of The Army Triangular section permanent magnetic structure

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2157182A (en) * 1935-12-31 1939-05-09 Rca Corp Cathode ray deflecting device
US2339087A (en) * 1939-06-30 1944-01-11 Milwaukee Gas Specialty Co Thermostatic control device
NL147275B (en) * 1948-07-01 Plessey Uk Limited ELECTRIC TORQUE SWITCH FOR PUSH-BUTTON CONTROL.

Also Published As

Publication number Publication date
DE1035812B (en) 1958-08-07
FR1120026A (en) 1956-06-28
US2799813A (en) 1957-07-16
NL87140C (en)

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