CURRENT SUPPLY MEMBER SUPPORT FOR HIGH-PRESSURE DISCHARGE LAMP

摘要

PHN . 9838 13 The invention relates to a high-pressure discharge lamp having a ceramic discharge vessel comprising an ionizable filling which in the operating condition of the lamp comprises a component present in excess, and in which two electrodes are present. The electrode is connected to a pin-shaped current supply member which is surrounded with a small gap by an end portion of the discharge vessel. According to the invention the pin-shaped current supply member and the end portion are connected in a gas-tight manner by means of a glass seal, in which the sealing glass seal extends into the small gap in the direction towards the electrode over such a distance that, in the operating condition of the lamp, the temperature at the surface of the glass seal facing the discharge is at least 50 K lower than the temperature of that part of the filling which determines the vapour pressure of the component present in excess. Herewith a high-pressure discharge vessel is obtained in which attack of the glass seal by components of the lamp filling is prevented.