Extended depth-of-field lenses and methods for their design,...

Details Extended depth-of-field lenses and methods for their design,... Extended depth-of-field lenses and methods for their design,...

2011-03-01

2011-03-01

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S721000

Reexamination Certificate

active

07898746

ABSTRACT:
For rotationally symmetric aspheric lenses, one can establish lens design and layout based upon the phase delay function exp[−iφ(ρ)]. An embodiment of the invention is a method for calculating a corresponding variation in focal length denoted by f(ρ). According to an aspect, one can also assert a shape for the focal length f(ρ) and thereafter calculate a phase delay function in order to synthesize a novel lens. New EDoF lens designs are obtained by selection of an inner and outer focal length connected by a simple curve that can be approximate by a polynomial. From the selected f(ρ), one can synthesize a finished EDoF lens design and fabricate the lens. Another aspect of this invention is directed to a method to tailor prior-art EDoF lenses so that their performance over some range is improved.

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