Hybrid photographic objective

Details Hybrid photographic objective Hybrid photographic objective

1997-12-02

1999-11-02

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359570, 359576, G02B 904, G02B 518

Patent

active

059781599

ABSTRACT:
The invention provides a high-performance yet low-cost phototaking optical system using a diffractive optical element. The optical system comprises, in order from an object side thereof, a first positive lens in a meniscus form convex toward the object side, an aperture stop, and a second positive lens in a double-convex form, with a diffractive surface formed on the object side of the first lens. The system comprising an aperture stop, at least two lenses and at least one diffractive surface satisfies the condition 0<d.sub.DOE /f<0.24 where f is a focal length of the overall system and d.sub.DOE is a distance on an optical axis thereof from the aperture stop to the diffractive surface. This condition is provided to locate the diffractive surface in the vicinity of the aperture stop to lower ray height, thereby placing chromatic aberration in a well-balanced state.

REFERENCES:
patent: 5680252 (1997-10-01), Sitter et al.
patent: 5970321 (1998-08-01), Goto

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