Front converter lens system using a diffractive surface

Details Front converter lens system using a diffractive surface Front converter lens system using a diffractive surface

1998-09-23

2000-08-01

Epps, Georgia

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359558, G02B 1502

Patent

active

060975474

ABSTRACT:
The invention provides an inexpensive yet lightweight front converter lens system which is improved in terms of performance by use of a diffractive surface. A front converter lens system CL mounted on a subject-side of a master lens system ML to convert its focal length comprises at least two lens groups, each comprising a diffractive surface r.sub.1 or r.sub.2.

REFERENCES:
patent: 5528416 (1996-06-01), Hartmann
patent: 5543966 (1996-08-01), Meyers
patent: 5548439 (1996-08-01), Smith
patent: 5748372 (1998-05-01), Kitagawa
patent: 5838497 (1998-11-01), Maruyama
Applied Optics/vol. 27, No. 14/Jul. 15, 1988 Hybrid Diffractive-Refractive Lenses and Achromats, T.Stone et al,pp. 2960-2971.
SPIE vol. 2689 "Diffractive Optics at Eastman Kodak Company"to M.K. Meyers, pp. 228-254 Aug., 1996.

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