Wide-angle lens with freeform surface
AssigneeImmervision, Inc.
InventorsJocelyn PARENT, Simon Thibault, Zhenfeng Zhuang, Patrice Roulet, Xavier Dallaire, Xiaojun Du, Pierre Konen
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Abstract
A method for designing a wide-angle optical system having at least one freeform optical surface without rotational symmetry to create a custom 2D object-image mapping. The method is based on iteratively adjusting the at least one freeform optical 2D surface shape to have the exact 2D object-image mapping required and then adjusting the optical element surfaces to meet the other required optical specifications. The iterative method is applied until both the desired 2D object-image mapping and the other required optical specifications are reached.
Claims10
An optical system with a target 2D object-image mapping derivative function, the optical system comprising a plurality of optical elements forming an image in an image plane, at least one of the plurality of optical elements comprising at least one freeform surface, the shape of the at least one freeform surface creating a target 2D object-image mapping derivative function, a sag of the at least one freeform surface of the optical system having at least one local minimum or local maximum across its surface and the 2D object-image mapping derivative function having at least one local minimum or local maximum.
Dependencies are inferred from the claim text.