GB605341A - Electron focusing apparatus - Google Patents

Electron focusing apparatus

Info

Publication number
GB605341A
GB605341A GB2818/45D GB281845D GB605341A GB 605341 A GB605341 A GB 605341A GB 2818/45 D GB2818/45 D GB 2818/45D GB 281845 D GB281845 D GB 281845D GB 605341 A GB605341 A GB 605341A
Authority
GB
United Kingdom
Prior art keywords
electromagnet
oct
permanent magnet
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
GB2818/45D
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.)
Philco Radio and Television Corp
Original Assignee
Philco Radio and Television Corp
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 Philco Radio and Television Corp filed Critical Philco Radio and Television Corp
Publication of GB605341A publication Critical patent/GB605341A/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

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

605,341. Electromagnets. PHILCO RADIO & TELEVISION CORPORATION. Oct. 25, 1945, No. 28189. Convention date, Oct. 31, 1944. [Class 35] [Also in Group XL (a)] Magnetic focusing means for a cathode-ray tube comprises a permanent' magnet 6 and an electromagnet 7, the electromagnet providing a small fraction of the total magnetomotive force of the order required to effect focusing adjustment. The permanent magnet and electromagnet are arranged concentrically, and have a common pole structure 8, 9. The polepieces 8, 9 have conical bores so that the focusing arrangement can be initially adjusted to centre the spot on the fluorescent screen. The permanent magnet 6 is magnetized by passing a short pulse of D.C. current through the electromagnet coil.
GB2818/45D 1944-10-31 1945-10-25 Electron focusing apparatus Expired GB605341A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US561206A US2433682A (en) 1944-10-31 1944-10-31 Electron focusing apparatus

Publications (1)

Publication Number Publication Date
GB605341A true GB605341A (en) 1948-07-21

Family

ID=24241069

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2818/45D Expired GB605341A (en) 1944-10-31 1945-10-25 Electron focusing apparatus

Country Status (2)

Country Link
US (1) US2433682A (en)
GB (1) GB605341A (en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE474550A (en) * 1945-09-18
BE487122A (en) * 1948-02-07
US2483133A (en) * 1948-02-13 1949-09-27 Gen Electric Focusing arrangement for cathoderay tubes
US2533687A (en) * 1949-05-27 1950-12-12 Quam Nichols Company Magnetic focusing device
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
US2544875A (en) * 1950-03-02 1951-03-13 Pye Ltd Combination centering, focusing, and deflecting device for beam of cathode-ray tubes
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
US2592185A (en) * 1950-12-09 1952-04-08 Quam Nichols Company Focusing device
US2822500A (en) * 1952-04-08 1958-02-04 Itt Traveling wave electron discharge devices
US2825840A (en) * 1953-01-29 1958-03-04 Itt Traveling wave electron discharge devices
US2897397A (en) * 1955-04-21 1959-07-28 Sylvania Electric Prod Traveling wave tube
US2943219A (en) * 1955-09-19 1960-06-28 Philco Corp Beam positioning apparatus for cathode ray tubes
US2993152A (en) * 1957-07-18 1961-07-18 Westinghouse Electric Corp Shields for magnets
US2941077A (en) * 1958-07-07 1960-06-14 Applied Radiation Corp Method of enlarging and shaping charged particle beams
NL274303A (en) * 1961-02-03
DE2352119C2 (en) * 1973-10-17 1975-12-18 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electron-optical system with a magnetic focusing and electromagnetic deflection arrangement designed as a unit
NL7611641A (en) * 1976-10-21 1978-04-25 Philips Nv DEVICE FOR MAGNETIC DEFLECTION OF ELECTRON BEAMS.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2188579A (en) * 1933-05-27 1940-01-30 Loewe Radio Inc Cathode ray tube, more particularly for television purposes
DE639469C (en) * 1934-12-20 1936-12-10 Fernseh Akt Ges Magnetic-electrical deflection system for Braun tubes, especially for television purposes
US2157182A (en) * 1935-12-31 1939-05-09 Rca Corp Cathode ray deflecting device
GB494839A (en) * 1937-05-01 1938-11-01 British Thomson Houston Co Ltd Improvements in and relating to cathode ray apparatus

Also Published As

Publication number Publication date
US2433682A (en) 1947-12-30

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