US2212206A - Electron device - Google Patents

Electron device Download PDF

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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
Application number
US170147A
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English (en)
Inventor
Holst Gilles
Wolf Menno
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.)
RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2212206A publication Critical patent/US2212206A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

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  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US170147A 1936-10-30 1937-10-21 Electron device Expired - Lifetime US2212206A (en)

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

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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:Method)
BE (1) BE424327A (en:Method)
FR (1) FR828375A (en:Method)
GB (1) GB487998A (en:Method)

Cited By (23)

* Cited by examiner, † Cited by third party
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
US2533689A (en) * 1950-06-28 1950-12-12 Quam Nichols Company Magnetic focusing device
US2533688A (en) * 1950-01-31 1950-12-12 Quam Nichols Company Focusing device
US2533687A (en) * 1949-05-27 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
US2608668A (en) * 1950-06-17 1952-08-26 Bell Telephone Labor Inc Magnetically focused electron gun
US2608665A (en) * 1950-07-29 1952-08-26 Gen Electric Permanent magnet focusing device
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL147885B (nl) * 1949-02-24 Matsushita Electric Ind Co Ltd Droge cel.

Cited By (23)

* Cited by examiner, † Cited by third party
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
GB487998A (en) 1938-06-29
FR828375A (fr) 1938-05-17
BE424327A (en:Method)

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