Electron discharge device employing inexpensive permanent magnets if significantly reduced size

Claim 2

An electron discharge device having a cathode electrode disposed along the longitudinal axis of the device, an anode electrode disposed therein in coaxial relationship with said cathode, a magnetic circuit for providing a magnetic field along said axis and in the space between said two electrodes characterized in that said magnetic circuit comprises a first magnetic pole piece disposed at one axial end of said anode, a permanent magnet which is substantially connected to and forms a flux path with said first pole piece and extends in said axial direction, and a second magnetic pole piece for magnetically connecting the free end of said permanent magnet and the other axial end of said anode; said second magnetic pole piece having a first face engaging said other axial end of said anode and a second face engaging said permanent magnet; the surface area of said second face being greater than the surface area of said first face; the width of said second pole piece being substantially equal to the width of said first pole piece.

Claim 3

An electron discharge device having: a cathode electrode disposed along the longitudinal axis of said device; a hollow metallic anode surrounding and substantially concentric with said cathode; means cooperative with said anode for hermetically sealing the interior region of said anode; a pair of substantially C-shaped pole pieces each being positioned on opposite sides of said anode; each of said C-shaped pole pieces having a first end of said C-shaped pole pieces positioned on opposite sides of and adjacent a first end of said anode; a pair of permanent magnet members being disposed substantially parallel to said longitudinal axis and extending between the second ends of said anode and the second ends of said C-shaped pole pieces; the first ends of said members positioned on opposite sides of and adjacent the second end of said anode; and the second ends of said members respectively engaging and substantially covered by the second ends of an associated C-shaped pole piece, said permanent magnet members and said C-shaped pole pieces all being on the exterior sides of said hermetically sealed region.

Claim 4

An electron discharge device having: a cathode electrode disposed along the longitudinal axis of said device; a hollow metallic anode surrounding and substantially concentric with said cathode; means cooperative with said anode for hermetically sealing the interior region of said anode; a pair of substantially C-shaped pole pieces each being positioned on opposite sides of said anode; each of said C-shaped pole pieces having a first end of said C-shaped pole pieces positioned on opposite sides of and adjacent a first end of said anode; a pair of permanent magnet members being disposed substantially parallel to said longitudinal axis and extending between the second ends of said anode and the second ends of said C-shaped pole pieces; the first ends of said members positioned on opposite sides of and adjacent the second end of said anode; and the second ends of said members respectively engaging and substantially covered by the second ends of an associated C-shaped pole piece, said permanent magnet members and said C-shaped pole pieces all being on the exterior sides of said hermetically sealed region.

Claim 5

The device of claim 2 wherein the second end portions of each of said pole pieces is tapered to form an end surface narrower than the first ends thereof.

Claim 6

The device of claim 2 wherein each of said permanent magnets is in turn comprised of a pair of magnets spaced apart from one another on their respective sides of said anode each forming a passageway for air entering the open space to cool said anode.