Lens system including a diffractive optical element

Details Lens system including a diffractive optical element Lens system including a diffractive optical element

1997-07-02

1999-09-07

Nguyen, Thong

Optical: systems and elements

Diffraction

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359570, 359738, G02B 530

Patent

active

059495774

ABSTRACT:
A single lens of high performance and high image quality has a diffractive optical element and, more particularly, an optical system best suited for use on optical instruments for which chromatic aberrations must be corrected, e.g., silver halide or electronic cameras. The optical system has one positive lens and a stop. At least one surface of the positive lens is constructed of a diffractive surface r.sub.1, and satisfies the condition 3<f.sub.D /f<30 where f.sub.D is a focal length of the diffractive surface, and f is a focal length of the entire lens system.

REFERENCES:
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Patent Abstracts of Japan, Publication No. 06324262 re Appln. No. 05132446, published Nov. 25, 1994.
Stone et al, "Hybrid Diffractive-refractive lenses and achromats", Applied Optics, vol. 27, No. 14, Jul. 15, 1988 pp. 2960-2971.

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