KATHODE FUER EINE HOCHDRUCKENTLADUNGSLAMPE

摘要

1. Cathode for a high-pressure discharge lamp composed of a refractory metal which is doped with an electron-emitting material and, optionally, further additives, which cathode comprises a cylindrical body (8) which is conically tapered on the discharge side, the tapering region (9) being outwardly coated with a carbide layer (11), characterized in that the thickness of the carbide layer (11) decreases in the direction of the tip (10) of the cone (9).