Patent ID: 7369303
Filing Date: 2008-05-06
Classification: G02B

Abstract:
1. A lens system comprising: an objective lens unit configured to establish an aperture stop; a positive triplet configured to simultaneously image light at an aperture stop in a wavelength range from about 3 to about 5 micrometers and light in a wavelength range from about 8 to about 12 micrometers to a common focal plane, said positive triplet comprising a first molded aspheric chalcogenide lens element positioned to receive light directly from said aperture stop and having an associated Abbe number V where N 8 is the refractive index at a wavelength of 8 micrometers, N 3 is the refractive index at a wavelength of 3 micrometers and N 13 is the refractive index at a wavelength of 13 micrometers.