Patent ID: 7430075

Claim:
Cardioid optics for darkfield illumination for microscopes, which cardioid optics can be arranged in front of the basic optics for the brightfield illumination and are adapted to the characteristics of the basic optics and comprise a combined mirror lens system with at least one concave reflecting surface and at least one convex reflecting surface which are arranged on at least one lens, and additional optics, in the form of an attachment lens (L 3 ), which can be inserted into the beam path in front of the mirror lens system on the object side as required, having the following specifications: Lens Radius Thickness n d ν d FRD L 1 r 1 = 16.1960 9.380 1.784 26.10 30.000 r 2 = 11.5461 3.680 1.607 56.65 23.092 L 2 r 3 = 8.0590 S 3.680 1.607 56.65 15.720 r 4 = −11.5461 S 7.200 1.607 56.65 IM r 5 = 11.8839 9.620 1.000/1.515 —/47.75 22.000 T 1.100 1.522 59.48 12.000 where the over-hemispherical reflecting spherical segment surface on lens L 2 is limited by radii −13.400 mm and −6.800 mm in front of the object-side lens vertex, n d is the refractive index of the glass, ν d is the Abbe number, FRD is the free diameter, T is the object carrier, S is the reflecting surface, L 1 and L 2 are lenses, and IM is the immersion medium.