Imaging lens

Details Imaging lens Imaging lens

2006-06-20

2006-06-20

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S791000, C359S789000

Reexamination Certificate

active

07064905

ABSTRACT:
The present invention includes, from an object side to an image-plane side: an aperture stop with a predetermined diameter, a first lens with a positive refractive power having a convex surface on the object side, a second lens with a positive refractive power having a concave surface on the object side, and a third lens with a negative refractive power having a convex surface on the object side. The second and third lenses have aspherical surfaces on their object-side and image-plane-side surfaces. The third lens is formed with an inflection point where the curvature orientation changes within the effective diameter range of the aspherical surface on the image-plane side. An appropriate back focus is maintained while the total length of the lens system is reduced. A compact, thin, high-performance design is achieved, which effectively corrects various aberrations, especially astigmatism and distortion, and is suited for digital cameras using high-density solid-state imaging elements of one million pixels or more.

REFERENCES:
patent: 4659186 (1987-04-01), Sato et al.
patent: 2004/0012861 (2004-01-01), Yamaguchi
patent: 2004/0196575 (2004-10-01), Nozawa
patent: 05-188284 (1993-07-01), None
patent: 09-133860 (1997-05-01), None

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