Imaging lens

Details Imaging lens Imaging lens

2008-04-24

2010-06-08

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S716000

Reexamination Certificate

active

07733582

ABSTRACT:
An imaging lens enables a large focal depth and low error sensitivity. The imaging lens satisfies “0.016<Δ/f<0.018,” where Δ is the absolute value of longitudinal chromatic aberrations at F curve and C curve wavelengths, and f is the combined focal distance of the entire compound imaging lens. A first, a second, and a third lens are disposed sequentially, the first lens disposed toward an object, and the third lens disposed toward an image surface. The first lens has a positive refraction, a meniscus shape, and a convex surface facing the object. The second lens has a meniscus shape with a concave surface facing the object. The third lens has a convex-type shape facing the object; and a concave-type aspherical shape facing the image surface, providing a negative refraction in a radially central portion and a positive refraction in a radially peripheral portion.

REFERENCES:
patent: 7468847 (2008-12-01), Tang
patent: 7602560 (2009-10-01), Kawasaki
patent: 2004/0179274 (2004-09-01), Amanai

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