Patent ID: 7701141
Filing Date: 2010-04-20
Classification: H01J,H05B,Y02B

Abstract:
1. A high pressure discharge lamp configured for resonant operation, the high pressure discharge lamp comprising an elongated ceramic discharge vessel that defines a lamp axis A and that has an inside volume with an inside length IL and a maximum inside diameter ID, and that is subdivided into a middle region of a constant inside diameter, where the constant inside diameter is given by the maximum inside diameter ID, and two end regions of variable inside diameter, an electrode in the end region projecting into the discharge vessel, wherein the inside length IL and the maximum inside diameter ID of the discharge vessel has an aspect ratio of 2.5 to 8, the end region having a given length LRD in which the variable inside diameter is reduced to at least 85% of the maximum inside diameter ID such that there remains at the end of the discharge vessel an end face that has at least 15% of the maximum inside diameter ID as inside diameter IDE, wherein the two end regions are configured to excite at least one acoustic resonance frequency.