Method of producing a lens

摘要

A method of producing a high-precision lens system, such as a stepper lens, involves the following steps: (a) attaching a metal frame to the radial periphery of each of a plurality of lens elements at a prescribed distance from the optical axis of the element; (b) positioning the periphery of each metal frame at a prescribed radial distance from a reference axis to align the optical axis of each lens element along the reference axis; and (c) securing the individual lens sections together. Adjustment of the eccentricity of the individual lenses is accomplished by measuring the displacement of the lens-frame periphery from the reference axis.