Patent ID: 7439691
Filing Date: 2008-10-21
Classification: H05B,Y02B

Abstract:
1. High pressure discharge lamp lighting device comprising: a high pressure discharge lamp having a pair of electrodes that have massive portions with tips that face each other across a gap of no more than 2.0 mm within a light emitting part in which are sealed at least 0.20 mg/mm a power supply device that is adapted to feed alternating current to the discharge lamp of different current values, wherein the power supply device feeds the alternating current to the discharge lamp in a manner such that a constant current control period (Ti) from initial discharge until a transition to a constant power control period (Tw) has a first control period (T wherein the power supply device is adapted to feed a current to the high pressure discharge lamp during the first control period (T wherein the power supply device is adapted to feed a current to the high pressure discharge lamp that has a second value (I