GB686527A - Improvements in or relating to focussing coils for electron beams - Google Patents

Improvements in or relating to focussing coils for electron beams

Info

Publication number
GB686527A
GB686527A GB21026/48A GB2102648A GB686527A GB 686527 A GB686527 A GB 686527A GB 21026/48 A GB21026/48 A GB 21026/48A GB 2102648 A GB2102648 A GB 2102648A GB 686527 A GB686527 A GB 686527A
Authority
GB
United Kingdom
Prior art keywords
coil
coils
current
spiral
rings
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
GB21026/48A
Inventor
Ralph Reginald Pearce
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical 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
Priority to NL72993D priority Critical patent/NL72993C/xx
Priority to NL656509700A priority patent/NL148036B/en
Application filed by EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB21026/48A priority patent/GB686527A/en
Priority to FR992387D priority patent/FR992387A/en
Priority to DEP51570A priority patent/DE812327C/en
Priority to US111007A priority patent/US2550592A/en
Publication of GB686527A publication Critical patent/GB686527A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/58Arrangements for focusing or reflecting ray or beam
    • H01J29/64Magnetic lenses
    • H01J29/66Magnetic lenses using electromagnetic means only

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electron Beam Exposure (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Particle Accelerators (AREA)

Abstract

686,527. Electron lenses. ELECTRIC & MUSICAL INDUSTRIES, Ltd. July 30, 1949 [Aug. 10, 1948; Nov. 3, 1948], Nos. 21026/48 and 28508/48. Class 39(i) [Also in Group XXXV] A focusing coil for a receiving cathode-ray tube comprises a flat conductor wound as a planar spiral or a plurality of short interconnected coil units each formed as a planar spiral arranged side by side, and the current supply connections are such as to produce an axial flow of current in opposite directions so that the resultant axial current flow is negligible. In one form, Fig. 2, the coil 7 is a strip of aluminium foil 0.001 inches thick and 2 inches wide and adjacent turns are insulated by paper 10 or by anodising the aluminium. Metallised paper may be used instead of foil. The inner end of the coil is wound on and connected to a copper former 9 both ends of which are connected to one terminal of current source 11, the other terminal of which is connected to the centre point of the outer end of the coil. The axial length of the coil is at least one half its minimum diameter. In another form, Fig. 3 (not shown), using an odd plurality of coil units, each coil unit may be of wire or narrow tape. Adjacent turns may be secured together by an adhesive or alternatively a ring of insulating material may have coils secured thereto on one or both sides. In another form, Figs. 5, 6, a methyl methacrylate ring is provided with spiral grooves 20, 21, one groove being clockwise and the other anticlockwise, which are then filled with copper by electro-deposition. The inner turns of the spiral grooves merge into annular grooves 24, 25 which when filled with metal provide contact rings 26, 27, and the outer ends of the spirals merge into contact areas 28, 29 connected to a contact eyelet. The inner ends of adjacent spirals of adjacent insulating rings are connected by metal rings 32, the other turns being insulated by paper rings 33 or by insulating layers applied to the coil units. The insulating rings are piled up and clamped together, the connections between the coils being as shown in Fig. 6, A indicating the clockwise wound coils and C the anticlockwise wound coils. Since the two centre coils C do not carry current and coils A are wound in the same direction the device effectively comprises an odd plurality of coils as in Fig. 3 (not shown). In another method of manufacture, a ring of phenolic resin, mica, or paper, is metallised on both sides by securing metal foil to it or by electrodeposition. The spiral coil pattern together with contact rings or areas is then painted, printed, or photographically reproduced on to the metallised surface and unrequired metal areas are then removed as described in Specification 602,492, [Group XXXV]. Insulating layers may be applied to the coil units. In a modification of this method, the spiral coils may be formed by spraying metal on to an insulating surface through a stencil. In another modification a tool may be applied to an insulator carrying a layer of metal foil to cut away the foil and so form the required spiral. The coil arrangements of the invention are such that an axial flow of current is reduced to a minimum and thus aberrations in focusing, allegedly due to axial components of current in the coils, are also reduced.
GB21026/48A 1948-08-10 1948-08-10 Improvements in or relating to focussing coils for electron beams Expired GB686527A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL72993D NL72993C (en) 1948-08-10
NL656509700A NL148036B (en) 1948-08-10 PROCESS FOR PREPARING VINYL FLUORIDE FROM ETHYN AND HYDROGEN FLUORIDE.
GB21026/48A GB686527A (en) 1948-08-10 1948-08-10 Improvements in or relating to focussing coils for electron beams
FR992387D FR992387A (en) 1948-08-10 1949-08-10 Developments to focusing coils for cathode ray tubes
DEP51570A DE812327C (en) 1948-08-10 1949-08-10 Focusing coils for cathode ray tubes
US111007A US2550592A (en) 1948-08-10 1949-08-18 Focusing coil for cathode-ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21026/48A GB686527A (en) 1948-08-10 1948-08-10 Improvements in or relating to focussing coils for electron beams

Publications (1)

Publication Number Publication Date
GB686527A true GB686527A (en) 1953-01-28

Family

ID=10155936

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21026/48A Expired GB686527A (en) 1948-08-10 1948-08-10 Improvements in or relating to focussing coils for electron beams

Country Status (5)

Country Link
US (1) US2550592A (en)
DE (1) DE812327C (en)
FR (1) FR992387A (en)
GB (1) GB686527A (en)
NL (2) NL72993C (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL73510C (en) * 1949-10-04
US3163839A (en) * 1953-12-30 1964-12-29 Sylvania Electric Prod Electromagnetic coils
BE534604A (en) * 1954-01-15
US3068433A (en) * 1954-04-15 1962-12-11 Sylvania Electric Prod Electromagnetic coils
US2763805A (en) * 1954-06-29 1956-09-18 Rca Corp Electromagnetic focus coil for cathode ray tube
US2897397A (en) * 1955-04-21 1959-07-28 Sylvania Electric Prod Traveling wave tube
US3015152A (en) * 1955-08-23 1962-01-02 Hazeltine Research Inc Process of manufacturing magnetic deflection yokes
US3270401A (en) * 1957-01-07 1966-09-06 Reynolds Metals Co Method and apparatus for producing insulated electrical conductor
US2977556A (en) * 1957-03-15 1961-03-28 Gen Electric Electrical coil
US2949593A (en) * 1957-05-09 1960-08-16 Reynolds Metals Co Electrical coil formed from multilayer strip conductor
US3142786A (en) * 1960-12-09 1964-07-28 Tsukamoto Kenkichi Miniaturized aluminum movable coil
US3497745A (en) * 1967-02-20 1970-02-24 Zenith Radio Corp Alignment magnet for cathode-ray tube
DE19632963C1 (en) * 1996-08-16 1997-12-18 Schmersal K A Gmbh & Co Safety switch for monitoring of movement of protective cover

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131536A (en) * 1932-03-16 1938-09-27 Knoll Max Electron microscope
GB478083A (en) * 1936-10-05 1938-01-12 Ferranti Ltd Improvements in or relating to cathode-ray tubes
GB504802A (en) * 1937-11-01 1939-05-01 Frederick Hermes Nicoll Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields
DE973258C (en) * 1938-03-08 1959-12-31 Siemens Ag Magnetic pole shoe lens with a small focal length for electron-optical enlargements in electron microscopes
US2264274A (en) * 1939-04-04 1941-12-02 Emi Ltd Cathode ray tube
US2356535A (en) * 1940-08-31 1944-08-22 Ruska Ernst Electronic lens

Also Published As

Publication number Publication date
NL72993C (en)
NL148036B (en)
DE812327C (en) 1951-08-27
FR992387A (en) 1951-10-17
US2550592A (en) 1951-04-24

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