HIGH PRESSURE DISCHARGE LAMP AND VEHICLE HEADLIGHT

摘要

The invention relates to a high pressure discharge lamp (10) and a vehicle headlight (100) comprising the high pressure discharge lamp. The high pressure discharge lamp according to the invention comprises a discharge vessel (12) comprising electrodes (16, 18) for creating a discharge arc (20) and for defining a longitudinal axis (30) connecting the electrodes. The discharge arc is displaced with respect to the longitudinal axis at a distance on a displacement axis (32) arranged perpendicular to the longitudinal axis. The high pressure discharge lamp further comprises a reflective surface (40; 42; 44; 46; 50; 52) for reflecting light emitted by a discharge arc towards a light-transmission window (60; 62) of the discharge vessel while substantially preventing the reflected light to pass through the discharge arc. The effect of the measures according to the invention is that the reflective surface is arranged to redirect the reflected light away from the discharge arc towards the light-transmission window, thus improving an efficiency of the high pressure discharge lamp.