Patent ID: 7185845

Claim:
A faceted ball lens assembly for an optical seeker system comprising: a spherical ball lens having a front region and a rear region, with a boresight line defining a center of a field of view of said faceted ball lens assembly and extending through said spherical ball lens, said spherical ball lens being truncated at said rear region to create at least one facet, with rays of light from a target entering said front side and being imperfectly focused at said facet into a blur circle by said ball lens, a blur circle detector attached to said at least one facet of said spherical ball lens, said blur circle detector being sensitive to position and movement of said blur circle thereon and providing an electrical output representative of said position and movement of said blur circle on said blur circle detector, a locating system responsive to said electrical output representative of said position and movement of said blur circle from said blur circle detector, for determining location of said target with respect to said faceted ball lens assembly.