Powerless field-corrective lens

G - Physics – 02 – B

Patent

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Details

G02B 13/18 (2006.01) G02B 5/18 (2006.01) G02B 27/00 (2006.01)

Patent

CA 2067021

An optical lens is disclosed which is capable of correcting for imaging system characteristics such as field curvature and spherical aberration. The corrective lens comprises a single optic device and imparts no additional power into the optical system. In particular, the corrective lens comprises a plano-based device (either plano-concave or plano-convex) including a series of stepped zones where the steps are formed to be parallel/perpendicular to the piano surface of the device. The stepped profile of the corrective lens is determined to approximate a lens curvature R which will impart a curvature to the wavefront passing therethrough to essentially cancel selected inherent imaging system aberrations. In particular, a corrective lens of the present invention may be utilized to correct for field curvature, spherical aberration, or both. The corrective lens of the present invention may be formed to be either transparent or reflective, depending upon system requirements.

Cette invention concerne une lentille optique adaptée pour corriger certaines caractéristiques d'un système imageur telles que la courbure de champ et l'aberration sphérique. La lentille correctrice est du type qui n'augmente pas la puissance d'agrandissement du système imageur. En particulier, il s'agit d'une lentille à base plane (du type soit plan convexe soit plan concave) qui comprend une série de gradins dont les deux plans sont respectivement parallèles et perpendiculaires à la surface plane du dispositif. La lentille correctrice présente un profil étagé calculé pour reproduire approximativement une courbure de lentille R qui a pour effet de courber le front d'onde qui la traverse afin d'annuler essentiellement des aberrations inhérentes précises du système imageur. En particulier, une lentille correctrice selon la présente invention peut être utilisée pour compenser la courbure de champ ou l'aberration sphérique, ou les deux. Elle peut être soit transparente soit réfléchissante, selon les besoins.

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