Image-forming lens set

Details Image-forming lens set Image-forming lens set

2007-05-17

2008-05-13

Mai, Huy (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S716000

Reexamination Certificate

active

07372643

ABSTRACT:
An image-forming lens set includes an aperture stop, a first lens with positive power, a second lens with negative power and a third lens, which are arranged from an object side order. The first lens has two opposite surfaces including a convex surface facing the object side, and at least one of the two opposite surfaces is a non-spherical surface. The second lens has two opposite surfaces including a concave surface facing the object side, and at least one of the two opposite surfaces of the second lens is a non-spherical surface. The third lens has negative refractive power becoming greater from a center to a periphery of positive refractive power. The third lens has two non-spherical opposite surfaces including a convex surface facing the object side. At least one of the first, second and third lenses is coated with a layer of optical film for filtering light.

REFERENCES:
patent: 6795253 (2004-09-01), Shinohara
patent: 7196855 (2007-03-01), Yamaguchi

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