Patent ID: 9076633
Filing Date: 2015-07-07
Classification: G21K,H01J

Abstract:
1. A sealed electron-beam device comprising an elongate body with an exit window, an elongate cathode housing with a proximal end and a distal end arranged inside the elongate body and one or more filaments arranged inside the cathode housing, the cathode housing further comprising one or more openings facing towards the exit window, the opening or openings being configured for passage of electrons generated by the filament to the exit window, wherein the elongate cathode housing comprises a semi-annular shell extending from the distal end to the proximal end, wherein the distal end of the cathode housing is inserted into an opening of a dome-shaped cap for covering components arranged in the distal end of the cathode housing and for minimizing high field strengths, a plate covering an upper part of the opening of the dome-shaped cap, the proximal end of the cathode housing extending into an opening of a proximal cap, a plate covering an upper part of the opening of the proximal cap, and longitudinal free edges of either the semi-annular shell of the cathode housing or the control grid are curled to form bulges, the bulges possessing ends pointing in a direction essentially perpendicular to a plane of the openings of the control grid.