US2212206A - Electron device - Google Patents
Electron device Download PDFInfo
- Publication number
- US2212206A US2212206A US170147A US17014737A US2212206A US 2212206 A US2212206 A US 2212206A US 170147 A US170147 A US 170147A US 17014737 A US17014737 A US 17014737A US 2212206 A US2212206 A US 2212206A
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- US
- United States
- Prior art keywords
- magnet
- tube
- electrons
- envelope
- magnetic
- 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 - Lifetime
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 28
- 229910052742 iron Inorganic materials 0.000 description 14
- 230000004907 flux Effects 0.000 description 6
- 239000000956 alloy Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000282461 Canis lupus Species 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Images
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
Definitions
- This invention relates to electronic devices and more particularly to methods and means for concentrating electrons into a well-defined beam by the use of fixed magnets in electron optical a systems.
- magnetic fields involve the difiiculty 7 that their effect cannot easily be localized and their influence on the beam of cathode rays extends over a comparatively great length. Particularly undesirable is the penetration of the magnetic field in the region where the beam of rays is deflected.
- the coils generating the magnetic field are enclosed in an iron casing having a slit.
- difflculties are disposed of by the present invention, which is based on the recognition that the prime quality kinds of magnet steel used of a) late allow of generating a concentration field of sufiicient intensity by means of a permanent magnet.
- the material is also capable of withstanding the heating necessary for degasify- 45 ing it, without its magnetic properties being altered.
- Another object is to produce an improved focusing system for electrons using fixed electromagnets.
- a further object is to provide an improved combined electromagnetic and electrostatic elecll tron optical system utilizing fixed electromagnets.
- alloys containing about nickel, 15 to cobalt, 5% aluminum and at most 5% titanium The remainder of the alloy consists of iron but may sometimes contain small admixtures (totaling some percent), of copper, manganese and chromium, which do not afiect the magnetic properties of the alloy.
- the invention has the advantage that permanent excitation by electric current is dispensed of.
- the intensity of the magnetic field in the space traversed by the beam of rays can also be controlled in the tube according to the invention.
- a magnetic shunt may be used which may be movably arranged outside the tube and by which a, variable portion of the magnetic flux is taken off from the path of the rays.
- the permanent magnet mayat the same time be used as an electrode, for instance, as an accelerating anode.
- a cylindrical magnet body is closed by two terminal plates which constitute the magnet poles and have a central aperture for the passage of the beam of rays.
- This aperture has preferably a smaller diameter than the cylindrical portion of the magnet.
- cathode ray tube embodying the invention is represented schematically.
- the glass wall of the tube is denoted by I.
- the conical portion contains the projection screen l2.
- the electrons emitted by the cathode 2 and controlled by the electrode 3 are accelerated by the electric field of the cathode and of the electrode 4 and concentrated by the magnetic field of the permanent magnet 5.
- the magnet consists of a cylindrical steel body 6 and two terminal plates 1 and 8. These plates may consist of soft iron and have a bore 9 and In for the passage of the beam of rays.
- the magnetic flux passes from the inner edge of one of the plates axially through the space surrounded by the cylindrical portion 6 to the inner edge of the other plate.
- the intensity of field in the discharge space outside the part surrounded by the cylinder 6 is but small and does not intervene with the effect of the electric or magnetic deflecting fields. set up there. .
- the flux passes partly between the outer edges of the plates 1 and 8.
- This part of the flux is completed substantially through the ma netic shunt II which can be shifted and surrounds the tube in the form of a cylinder.
- the part of the magnetic flux traversing the yoke II is larger as the distance not shunted by the yoke H is made shorter. Thus the intensity of field in the path of the rays can be controlled.
- the plates 1, 8 and the cylinder 6 form together mechanically. one part. By anchoring this part it can be prevented from being shifted. If desired, the glass wall of the tube may be sealed to the edges of the plates 1 and 8. Between the plate 1 and the electrode 4 may he set up a potential difference so that the magnet system constitutes at the same time one of the electrodes of the tube.
- the alloy To enable the arrangement of a permanent magnet of suiilcient strength inside the tube the alloy must have a high energy per cm. contents, this energy being expressed in the value of BHmax.
- an alloy will generally be required whose magnetic properties do not appreciably vary by heating to a temperature of say, 500 C. for degasifying, and whose BHmax exceeds 10 cgs. units.
- the volume of the magnet may be larger when the diameter of the tube is larger. Since, however, larger dimensions of the tube generally involve a higher power thereof, the
- a cathode ray tube comprising an envelope, 2. source of electrons within said envelope, an annular cylindrical fixed magnet within the tube positioned in register with said source of 50 electrons, and an apertured terminal plate positioned upon each end of the cylindrical magnet and concentric therewitli.
- a cathode ray tube as claimed in claim 1 in which the external diameter of the cylinder is smaller than the external diameter of the terminal plates.
- a cathode ray tube comprising an envelope, a source of electrons within the envelope, means to direct electrons from the source along a predetermined path, an annular cylindrical fixed drical magnet, a cylindrical magnetic shunt surrounding at least one of the soft iron disks and concentric with the fixed magnet, and a target mounted within the envelope and in regis-' ter with the apertured soft iron disks, said target being adapted to be bombarded by the electrons after passing along the predetermined path.
- a cathode ray tube comprising an envelope, a source of electrons within the envelope, means to direct electrons from the source along a predetermined path, an annular cylindrical fixed magnet within the tube positioned coincident with the predetermined path, an apertured soft iron disk positioned on each end of the cylindrical magnet, a cylindrical magnetic shunt exterior of the envelope surrounding at least one of the soft iron disks and concentric with the fixed magnet, and a target mounted within the envelope and in register with the apertured soft iron disks, said target being adapted to be bombarded by the electrons after passing along the predetermined path.
- a cathode ray tube comprising an envelope, a source of electrons within the envelope, means to direct electrons from the source along a predetermined path, an annular cylindrical fixed magnet within the tube positioned coincident with the predetermined path, an apertured soft iron disk positioned on each end of the cylindrical magnet, a symmetrical magnetic shunt surrounding at least one of the soft iron disks and concentric with the fixed magnet, and a target' mounted within the envelope and in register with the apertured soft iron disks, said target being adapted to be bombarded by the electrons after passing along the predetermined path.
- a cathode ray tube comprising an envelope, a source of electrons within the envelope, means to direct electrons from the source along a predetermined path, an annular cylindrical fixed magnet within the tube positioned coincident with the predetermined path, an apertured soft iron disk positioned on each end of the cylindrical magnet, a symmetrical magnetic shunt exterior of the envelope surrounding at least one of the soft iron disks and concentric with the fixed magnet, and a target mounted within the envelope and in register with the apertured soft iron disks, said target being adapted to be bombarded by the electrons after passing along the predetermined path.
Landscapes
- Superconductors And Manufacturing Methods Therefor (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Description
Afig-.20, 19 0- G. HOLST El AL ELECTRON DEVICE Filed 001:. 21, 1937 INVENTORS GILLES HOLST 5 4454/11 0 WOLF ATTORNFV Patented Aug. 20, 1940 UNITED STATES PATENT OFFICE 2,212,206 ELECTRON nsvron N. Y., a corporation Application October 21 of Delaware 1937, Serial No. 170,147
lin the Netherlands October 30, 1936' 9 Claims.
This invention relates to electronic devices and more particularly to methods and means for concentrating electrons into a well-defined beam by the use of fixed magnets in electron optical a systems.
in contradistinction to the concentration of cathode rays by electric fields the use of magnetic fields for this purpose has the advantage that one has not to take exactly into account 3% the dimensions and the mutual position of the parts producing the field, to the extent as is the case in electro-static focusing.
However, magnetic fields involve the difiiculty 7 that their effect cannot easily be localized and their influence on the beam of cathode rays extends over a comparatively great length. Particularly undesirable is the penetration of the magnetic field in the region where the beam of rays is deflected. To limit as much as possible the effect of the concentrating magnetic field to a definite point, the coils generating the magnetic field are enclosed in an iron casing having a slit.
Furthermore cathode ray tubes have already been described in which the magnet coil is provided inside the tube so that it has a small diameter. This construction is satisfactory also with a View to limiting the space eil'ect of the coils, since this decreases with the diameter of the coils. However, it has the disadvantage that there is space available only for a limited number of turns per unit of length and in addition-that the construction of magnet coils withstanding the required degasifying temperatures and not 85 releasing detrimental gases during operation, is
very diflicult.
These difflculties are disposed of by the present invention, which is based on the recognition that the prime quality kinds of magnet steel used of a) late allow of generating a concentration field of sufiicient intensity by means of a permanent magnet. Thus not only a strong induction can be achieved but the material is also capable of withstanding the heating necessary for degasify- 45 ing it, without its magnetic properties being altered.
Accordingly, it is one of the objects of this invention to provide new and improved method and means for focusing electrons.
50 Another object is to produce an improved focusing system for electrons using fixed electromagnets.
A further object is to provide an improved combined electromagnetic and electrostatic elecll tron optical system utilizing fixed electromagnets.
incorporated. By way of example we may mention an alloy containing about nickel, 15 to cobalt, 5% aluminum and at most 5% titanium. The remainder of the alloy consists of iron but may sometimes contain small admixtures (totaling some percent), of copper, manganese and chromium, which do not afiect the magnetic properties of the alloy.
The invention has the advantage that permanent excitation by electric current is dispensed of. The intensity of the magnetic field in the space traversed by the beam of rays can also be controlled in the tube according to the invention. For this purpose a magnetic shunt may be used which may be movably arranged outside the tube and by which a, variable portion of the magnetic flux is taken off from the path of the rays.
The permanent magnetmayat the same time be used as an electrode, for instance, as an accelerating anode. Preferably, a cylindrical magnet body is closed by two terminal plates which constitute the magnet poles and have a central aperture for the passage of the beam of rays. This aperture has preferably a smaller diameter than the cylindrical portion of the magnet. Furthermore, it is advantageous to give the external diameter of these plates a higher value than the external diameter of the cylindrical part. They may either fit in the tube, or, if desired, be sealed to the glass wall thereof.
One form of construction of a cathode ray tube according to the invention will be set forth with reference to the accompanying drawing, in which a cathode ray tube embodying the invention is represented schematically.
The glass wall of the tube is denoted by I. The conical portion contains the projection screen l2.
The electrons emitted by the cathode 2 and controlled by the electrode 3 are accelerated by the electric field of the cathode and of the electrode 4 and concentrated by the magnetic field of the permanent magnet 5. The magnet consists of a cylindrical steel body 6 and two terminal plates 1 and 8. These plates may consist of soft iron and have a bore 9 and In for the passage of the beam of rays. The magnetic flux passes from the inner edge of one of the plates axially through the space surrounded by the cylindrical portion 6 to the inner edge of the other plate. The intensity of field in the discharge space outside the part surrounded by the cylinder 6 is but small and does not intervene with the effect of the electric or magnetic deflecting fields. set up there. .The flux passes partly between the outer edges of the plates 1 and 8.
This part of the flux is completed substantially through the ma netic shunt II which can be shifted and surrounds the tube in the form of a cylinder. The part of the magnetic flux traversing the yoke II is larger as the distance not shunted by the yoke H is made shorter. Thus the intensity of field in the path of the rays can be controlled.
The plates 1, 8 and the cylinder 6 form together mechanically. one part. By anchoring this part it can be prevented from being shifted. If desired, the glass wall of the tube may be sealed to the edges of the plates 1 and 8. Between the plate 1 and the electrode 4 may he set up a potential difference so that the magnet system constitutes at the same time one of the electrodes of the tube.
To enable the arrangement of a permanent magnet of suiilcient strength inside the tube the alloy must have a high energy per cm. contents, this energy being expressed in the value of BHmax. For a tube according to the invention an alloy will generally be required whose magnetic properties do not appreciably vary by heating to a temperature of say, 500 C. for degasifying, and whose BHmax exceeds 10 cgs. units.
Of course, the volume of the magnet may be larger when the diameter of the tube is larger. Since, however, larger dimensions of the tube generally involve a higher power thereof, the
magnetic flux of force must accordingly be larger so that irrespective of the size of the tube the above value for BI'Irnax should generally not be made smaller.
Having described our invention, what we 5 claim is:
1. A cathode ray tube comprising an envelope, 2. source of electrons within said envelope, an annular cylindrical fixed magnet within the tube positioned in register with said source of 50 electrons, and an apertured terminal plate positioned upon each end of the cylindrical magnet and concentric therewitli.
2. A cathode ray tube as claimed in claim 1, in which the internal diameter of the cylinder is larger than the diameter of the aperture in the terminal plates.
3. A cathode ray tube as claimed in claim 1 in which the external diameter of the cylinder is smaller than the external diameter of the terminal plates.
4. A cathode ray tube as claimed in claim 1, in which the glass wall of the tube is sealed to the edges of the terminal plates.
5. A cathode ray tube comprising an envelope, a source of electrons within the envelope, means to direct electrons from the source along a predetermined path, an annular cylindrical fixed drical magnet, a cylindrical magnetic shunt surrounding at least one of the soft iron disks and concentric with the fixed magnet, and a target mounted within the envelope and in regis-' ter with the apertured soft iron disks, said target being adapted to be bombarded by the electrons after passing along the predetermined path.
7. A cathode ray tube comprising an envelope, a source of electrons within the envelope, means to direct electrons from the source along a predetermined path, an annular cylindrical fixed magnet within the tube positioned coincident with the predetermined path, an apertured soft iron disk positioned on each end of the cylindrical magnet, a cylindrical magnetic shunt exterior of the envelope surrounding at least one of the soft iron disks and concentric with the fixed magnet, and a target mounted within the envelope and in register with the apertured soft iron disks, said target being adapted to be bombarded by the electrons after passing along the predetermined path.
8. A cathode ray tube comprising an envelope, a source of electrons within the envelope, means to direct electrons from the source along a predetermined path, an annular cylindrical fixed magnet within the tube positioned coincident with the predetermined path, an apertured soft iron disk positioned on each end of the cylindrical magnet, a symmetrical magnetic shunt surrounding at least one of the soft iron disks and concentric with the fixed magnet, and a target' mounted within the envelope and in register with the apertured soft iron disks, said target being adapted to be bombarded by the electrons after passing along the predetermined path.
9. A cathode ray tube comprising an envelope, a source of electrons within the envelope, means to direct electrons from the source along a predetermined path, an annular cylindrical fixed magnet within the tube positioned coincident with the predetermined path, an apertured soft iron disk positioned on each end of the cylindrical magnet, a symmetrical magnetic shunt exterior of the envelope surrounding at least one of the soft iron disks and concentric with the fixed magnet, and a target mounted within the envelope and in register with the apertured soft iron disks, said target being adapted to be bombarded by the electrons after passing along the predetermined path.
GILLES HOLST. MENNO WOLF.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE487998X | 1936-10-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2212206A true US2212206A (en) | 1940-08-20 |
Family
ID=6543722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US170147A Expired - Lifetime US2212206A (en) | 1936-10-30 | 1937-10-21 | Electron device |
Country Status (4)
Country | Link |
---|---|
US (1) | US2212206A (en) |
BE (1) | BE424327A (en) |
FR (1) | FR828375A (en) |
GB (1) | GB487998A (en) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2425125A (en) * | 1940-07-20 | 1947-08-05 | Hartford Nat Bank & Trust Co | Cathode-ray tube with magnetic compensating means |
US2503173A (en) * | 1946-10-18 | 1950-04-04 | Rca Corp | Permanent magnetic electron lens system |
US2522872A (en) * | 1949-01-10 | 1950-09-19 | Heppner Mfg Company | Device for controlling the path of travel of electrons in cathoderay tubes |
US2533687A (en) * | 1949-05-27 | 1950-12-12 | Quam Nichols Company | Magnetic focusing device |
US2533688A (en) * | 1950-01-31 | 1950-12-12 | Quam Nichols Company | Focusing device |
US2533689A (en) * | 1950-06-28 | 1950-12-12 | Quam Nichols Company | Magnetic focusing device |
US2541446A (en) * | 1949-01-04 | 1951-02-13 | Barnet S Trott | Image distortion corrector for cathode-ray tubes |
US2552342A (en) * | 1949-11-17 | 1951-05-08 | Clarostat Mfg Co Inc | Magnetic structure for use in ion-traps |
US2555850A (en) * | 1948-01-28 | 1951-06-05 | Nicholas D Glyptis | Ion trap |
US2568668A (en) * | 1950-08-18 | 1951-09-18 | Best Mfg Co Inc | Cathode-ray tube focusing device of the permanent magnet type |
US2580606A (en) * | 1951-03-21 | 1952-01-01 | Best Mfg Company Inc | Cathode-ray tube focusing device |
US2592185A (en) * | 1950-12-09 | 1952-04-08 | Quam Nichols Company | Focusing device |
US2591820A (en) * | 1948-02-07 | 1952-04-08 | Pye Ltd | Suspension mounting for the focussing device of cathode-ray tubes |
US2594099A (en) * | 1950-04-22 | 1952-04-22 | Ite Circuit Breaker Ltd | Focusing coil for cathode-ray tubes |
US2602902A (en) * | 1950-02-14 | 1952-07-08 | Bendix Aviat Corp | Sweep amplitude control for magnetically deflected cathode-ray tubes |
US2608665A (en) * | 1950-07-29 | 1952-08-26 | Gen Electric | Permanent magnet focusing device |
US2608668A (en) * | 1950-06-17 | 1952-08-26 | Bell Telephone Labor Inc | Magnetically focused electron gun |
US2619607A (en) * | 1951-03-10 | 1952-11-25 | Glaser Steers Corp | Internal focusing device |
US2664514A (en) * | 1952-03-10 | 1953-12-29 | All Star Products Inc | Magnetic focusing mechanism |
US2681421A (en) * | 1952-03-04 | 1954-06-15 | Gen Electric | Magnetic focusing structure for electron beams |
US2785330A (en) * | 1953-10-19 | 1957-03-12 | Nat Video Corp | Internal pole piece arrangement for a magnetically-focused cathode ray tube |
US2859364A (en) * | 1953-05-30 | 1958-11-04 | Int Standard Electric Corp | Gun system comprising an ion trap |
US2895066A (en) * | 1954-10-04 | 1959-07-14 | Int Standard Electric Corp | Traveling wave tube |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL147885B (en) * | 1949-02-24 | Matsushita Electric Ind Co Ltd | DRY CELL. |
-
0
- BE BE424327D patent/BE424327A/xx unknown
-
1937
- 1937-10-21 US US170147A patent/US2212206A/en not_active Expired - Lifetime
- 1937-10-27 GB GB29365/37A patent/GB487998A/en not_active Expired
- 1937-10-28 FR FR828375D patent/FR828375A/en not_active Expired
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2425125A (en) * | 1940-07-20 | 1947-08-05 | Hartford Nat Bank & Trust Co | Cathode-ray tube with magnetic compensating means |
US2503173A (en) * | 1946-10-18 | 1950-04-04 | Rca Corp | Permanent magnetic electron lens system |
US2555850A (en) * | 1948-01-28 | 1951-06-05 | Nicholas D Glyptis | Ion trap |
US2591820A (en) * | 1948-02-07 | 1952-04-08 | Pye Ltd | Suspension mounting for the focussing device of cathode-ray tubes |
US2541446A (en) * | 1949-01-04 | 1951-02-13 | Barnet S Trott | Image distortion corrector for cathode-ray tubes |
US2522872A (en) * | 1949-01-10 | 1950-09-19 | Heppner Mfg Company | Device for controlling the path of travel of electrons in cathoderay tubes |
US2533687A (en) * | 1949-05-27 | 1950-12-12 | Quam Nichols Company | Magnetic focusing device |
US2552342A (en) * | 1949-11-17 | 1951-05-08 | Clarostat Mfg Co Inc | Magnetic structure for use in ion-traps |
US2533688A (en) * | 1950-01-31 | 1950-12-12 | Quam Nichols Company | Focusing device |
US2602902A (en) * | 1950-02-14 | 1952-07-08 | Bendix Aviat Corp | Sweep amplitude control for magnetically deflected cathode-ray tubes |
US2594099A (en) * | 1950-04-22 | 1952-04-22 | Ite Circuit Breaker Ltd | Focusing coil for cathode-ray tubes |
US2608668A (en) * | 1950-06-17 | 1952-08-26 | Bell Telephone Labor Inc | Magnetically focused electron gun |
US2533689A (en) * | 1950-06-28 | 1950-12-12 | Quam Nichols Company | Magnetic focusing device |
US2608665A (en) * | 1950-07-29 | 1952-08-26 | Gen Electric | Permanent magnet focusing device |
US2568668A (en) * | 1950-08-18 | 1951-09-18 | Best Mfg Co Inc | Cathode-ray tube focusing device of the permanent magnet type |
US2592185A (en) * | 1950-12-09 | 1952-04-08 | Quam Nichols Company | Focusing device |
US2619607A (en) * | 1951-03-10 | 1952-11-25 | Glaser Steers Corp | Internal focusing device |
US2580606A (en) * | 1951-03-21 | 1952-01-01 | Best Mfg Company Inc | Cathode-ray tube focusing device |
US2681421A (en) * | 1952-03-04 | 1954-06-15 | Gen Electric | Magnetic focusing structure for electron beams |
US2664514A (en) * | 1952-03-10 | 1953-12-29 | All Star Products Inc | Magnetic focusing mechanism |
US2859364A (en) * | 1953-05-30 | 1958-11-04 | Int Standard Electric Corp | Gun system comprising an ion trap |
US2785330A (en) * | 1953-10-19 | 1957-03-12 | Nat Video Corp | Internal pole piece arrangement for a magnetically-focused cathode ray tube |
US2895066A (en) * | 1954-10-04 | 1959-07-14 | Int Standard Electric Corp | Traveling wave tube |
Also Published As
Publication number | Publication date |
---|---|
BE424327A (en) | |
GB487998A (en) | 1938-06-29 |
FR828375A (en) | 1938-05-17 |
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