US2406824A - Electron discharge apparatus - Google Patents

Electron discharge apparatus Download PDF

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Publication number
US2406824A
US2406824A US399598A US39959841A US2406824A US 2406824 A US2406824 A US 2406824A US 399598 A US399598 A US 399598A US 39959841 A US39959841 A US 39959841A US 2406824 A US2406824 A US 2406824A
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United States
Prior art keywords
grid
potential
tubular
discharge apparatus
tube
Prior art date
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Expired - Lifetime
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US399598A
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English (en)
Inventor
Fremlin John Heaver
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
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    • 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
    • H01J29/62—Electrostatic lenses

Definitions

  • This invention relates to electron discharge apparatus incorporating focussing systems for electron beams set up in the apparatus.
  • Proposals have also been made, particularly with a view to obtaining continuous potential gradients along substantial lengths of the beam path and thereby facilitating the concentration of beams of large intensity and density, to provide interleaved conductors of different potential in a common cylindrical surface, the conductors at onepotential being tapered in one direction and the conductors of the other potential being tapered in the opposite direction along the axis.
  • the present invention provides alternative structures providing greater freedom in design and simplicity in manufacture.
  • the structure now proposed comprises a foraminate tube or tubular grid surrounded by a co-axial tube capable of influencing the field within the foraminate tube or tubular grid, one or both of said tubular elements being of nonuniform diameter along the length of the system
  • a tubular grid of uniform diameter and a flared outer tube Preferably we employ a tubular grid of uniform diameter and a flared outer tube.
  • the grid may be a wire helix or it may be constructed of parallel wires in a cylindrical boundary.
  • the outer tube is preferably of sheet metal although it may be foraminate so long as the mesh is fine compared with that of the tubular grid.
  • FIG. 2 shows a section along the line A-A of Fig. 1.
  • the structure shown comprises a tu bular grid of parallel wires F extending from a metal tube E.
  • a sheet metal tube G Surrounding the tubular grid is a sheet metal tube G converging from a large diameter end adjacent the tube E to a cylindrical portion 13 of diameter comparable with the grid diameter at the free end of the grid wires F.
  • a transverse insulating annulus C is provided for the mechanical support of the grid wires.
  • the tubular grid with its tubular extension E and the outer sheet metal tube G are adapted to be maintained at difierent potentials.
  • the potential of the space within metal tube E is made equal to that of the grid. There is no reason, however, why the diameter and potential of DE should not have any desired arbitrary value. In the same way the potential of the initial tubular portion B may be at any arbitrary potential. In some cases it is convenient to have the diameter and potential of B or E intermediate between those of the grid and of the continuous external conductor, the grid wires being then supported at both ends for example by thin sheets of mica.
  • the grid is shown as of uniform diameter, the outer conductor being flared, similar efiects can be secured by using an outer tube of uniform diameter and a flared grid. Alternatively both elements may be of non-uniform diameter.
  • any desired potential distribution along the electron path can be set up by suitable grading of the tube diameters along the path, choice of grid aperture and of potentials.
  • Electron discharge apparatus comprising, as a focussing system adapted When suitable potentials are applied to provide a desired potential gradient along the path of an electron beam, a foraminate tubular electrode surrounded by a coaxial tube capable of influencing the field within the foraminate tubular electrode, said electrode and tube being coextensive throughout at least part of their length and at least one of said tubular elements being of non-uniform diameter along the coextensive length of the ystem.
  • Electron discharge apparatus comprising, as a focussing system adapted to provide a desired potential gradient along the path of an electron beam, a foraminate tubular grid of substantially uniform diameter a coaxial tube surrounding said foraminate tubular grid and extending at least in part along the length of said grid and being of varying diameter along said coextensive part adapted when given a potential different from that of the foraminate tubular grid to modify the field within said foraminate tube or tubular grid.
  • Electron discharge apparatus according to claim 2 wherein parallel wires in a cylindrical boundary serve as tubular grid and a flared sheet metal tube constitutes the outer co-axial tube.
  • Electron discharge apparatus according to claim 2 wherein the foraminate tubular grid has a sheet metal tubular extension at a flared end of the outer tube.
  • Electron discharge apparatus according to claim 2 wherein the outer tube converges upon and extends beyond one end of the foraminate tubular grid.
  • Electron discharge apparatus as claimed in claim 2 comprising mean for applying to the inner and outer tubes of the focussing system potentials differing from each other and from that of a thermionic cathode disposed on the axis of the focussing. system and co-operating with said system to form an electron gun.

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  • Electron Sources, Ion Sources (AREA)
US399598A 1940-06-21 1941-06-25 Electron discharge apparatus Expired - Lifetime US2406824A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2406824X 1940-06-21

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US2406824A true US2406824A (en) 1946-09-03

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US399598A Expired - Lifetime US2406824A (en) 1940-06-21 1941-06-25 Electron discharge apparatus

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BE (1) BE478601A (enrdf_load_html_response)

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