Field curvature corrector

Details Field curvature corrector Field curvature corrector

1994-02-04

1996-09-24

Nguyen, Thong

Optical: systems and elements

Lens

Including a nonspherical surface

359362, 359648, 359662, G02B 302, G02B 900

Patent

active

055596371

ABSTRACT:
A field curvature corrector is provided which has a positive power and a positive exact field curvature (EFC) value for at least one principal ray, where the EFC value is given by:

REFERENCES:
patent: 4094585 (1978-06-01), Betensley
patent: 4545652 (1985-10-01), Hoogland
patent: 4679912 (1987-07-01), Loy
patent: 4929071 (1990-05-01), Mercado
patent: 5125064 (1992-06-01), Naselli et al.
patent: 5200861 (1993-04-01), Moskovich

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