Patent ID: 7218707

Claim:
A high voltage vacuum tube, in which an anode and a cathode are disposed opposite one another in a vacuumized inner space and which vacuumized inner space is enclosed by a cylindrical metal housing, the anode and/or the cathode being electrically insulated by means of an annular insulator, the annular insulator having a cylindrical part, with a curved humped arch in direction of the vacuumized inner space, comprising: in direction of the vacuumized inner space, a sloping front area, a shortened lateral area and a raised lateral area, the arch being characterized substantially by angles α, β and γ of the raised lateral area, of the front area and of the shortened lateral area, wherein said sloping front area of the annular insulator with an anode-side design slopes toward a disc center of the annular insulator, or respectively with cathode-side design away from the disc center of the annular insulator, wherein the angle γ between an axial direction of the annular insulator and the shortened lateral area is between 10° and 25°, wherein the angle β of the front area to a perpendicular to the axial direction of the annular insulator is between 10° and 25°, and wherein the angle a between the raised lateral area to the axial direction of the annular insulator is between 10° and 25°.