Patent ID: 7530707

Claim:
A semiconductor radiation source for curing light-polymerizable dental materials, said source comprising: a common base body; at least two light sources which are fixed on the common base body and by means of which light can be emitted jointly over a total emission spectrum, the first light source having a short-wave, in particular from 400 to 430 nm emission spectrum, and the second light source having a longer-wave, in particular from approximately 450 to 480 nm emission spectrum, wherein one of the light sources ( 16 ), in particular the first light source, is arranged in an optical axis ( 22 ) and the other light source ( 18 ), in particular the second light source, has at least two chips ( 24 , 26 , 28 , 30 ) which are arranged in particular symmetrically with respect to one another and with respect to the optical axis ( 22 ) and in a manner surrounding the optical axis ( 22 ), wherein a covering lens ( 52 ) is arranged in the beam path downstream of the LED chips ( 24 , 26 , 28 , 30 ), said covering lens being formed in plane fashion in particular on the side facing the light sources, and wherein a spacer therefor is formed essentially in tubular or linear fashion, and wherein the spacer is at least partly supported on a printed circuit board and/or the base body ( 12 ), and wherein a closed space having a transparent or translucent, liquid or gelatinous substance, in particular silicone gel or a potting composition, extends between the LED chips ( 24 , 26 , 28 , 30 ), the spacer and the covering lens.