Achromatic lens system including a diffraction lens

Details Achromatic lens system including a diffraction lens Achromatic lens system including a diffraction lens

1998-06-03

1999-09-28

Dang, Hung Xuan

Optical: systems and elements

Lens

With variable magnification

359691, G02B 1514

Patent

active

059597852

ABSTRACT:
An achromatic lens system comprising a front lens group, a diffraction lens and a rear lens group, in this order from the object side, wherein; the front lens group is provided with a frontmost convex surface on the object side and a rearmost concave surface on the image side; the rear lens group is provided with a rearmost convex surface on the image side; the front and rear lens groups are arranged to generate under-axial chromatic aberration for blue light and generate over-axial chromatic aberration for red light, with respect to green light that is considered the reference light; and, achromatic correction of light in the visible region is conducted by correcting the axial chromatic aberrations with a diffracting function of the diffraction lens.

REFERENCES:
patent: 5568325 (1996-10-01), Hirano et al.
patent: 5629799 (1997-05-01), Maruyama et al.
"Hybrid Diffractive-Refractive Lenses and Achromats", Applied Optics, vol. 27, No. 14, Jul. 15, 1988 (pp. 2960-2971).

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