GB686527A - Improvements in or relating to focussing coils for electron beams - Google Patents
Improvements in or relating to focussing coils for electron beamsInfo
- 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
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
- H01J29/66—Magnetic 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.
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)
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)
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 |
-
0
- NL NL656509700A patent/NL148036B/en unknown
- NL NL72993D patent/NL72993C/xx active
-
1948
- 1948-08-10 GB GB21026/48A patent/GB686527A/en not_active Expired
-
1949
- 1949-08-10 FR FR992387D patent/FR992387A/en not_active Expired
- 1949-08-10 DE DEP51570A patent/DE812327C/en not_active Expired
- 1949-08-18 US US111007A patent/US2550592A/en not_active Expired - Lifetime
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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