Patent ID: 6984932

Claim:
A discharge lamp having a base plate ( 4 ), a top plate ( 3 ) for the light exit, which is at least partially transparent, a discharge space ( 6 ) between the base plate and the top plate for holding a discharge medium, an electrode set ( 5 ) for producing dielectrically impeded discharges ( 7 ) in the discharge medium and a dielectric layer between at least one part of the electrode set ( 5 ) and the discharge medium, characterized in that the surface of the top plate ( 3 ) facing the discharge space ( 6 ) has a corrugated structure, extremes ( 2 ) of the corrugated shape which respectively face the base plate forming supporting projections for supporting the top plate ( 3 ) against the base plate ( 4 ), and there resulting, in two mutually nonparallel planes of section (A—A) perpendicular overall to the top plate ( 3 ), corrugated lines of section of the surface which satisfy the condition: Max(( f ′( x+s )− f ′( x ))/ s )· s <Max(( f ( x+s )− f ( x ))/ s ) when they are denoted in the respective plane of section by f(x) as a function of the parameter x of an x-axis parallel overall to the top plate ( 3 ), the symbol max respectively denoting the maximum absolute value of the term in the respective bracket for all values x, neglecting the edge regions of the top plate ( 3 ), f′(x) being the first derivative of f(x) with respect to x, and s having a value from 1.6 mm to 2 mm.