Patent ID: 8106585
Filing Date: 2012-01-31
Classification: H01J,H05B

Abstract:
1. A high-pressure discharge lamp comprising: a glass light emission part forming an enclosed substantially spherical or ellipsoidal opening having a pair of electrodes aligned on a longitudinal axis of the light emission part, each electrode extends from opposite sides of the light emission part along the longitudinal axis into the enclosed opening with a spaced gap between ends of the electrodes, an operative amount of mercury is contained within the enclosed opening to support a discharge; and glass sealed cylinder like parts, connecting the electrodes to the light emission part and extending away from the light emission part, are in alignment with the longitudinal axis wherein the amount of Na per unit volume associated with the glass light emission part around the enclosed opening is smaller than the amount of Na per unit volume in the glass sealed parts connecting the electrodes on the opposite sides of the glass light emission part.