Image-forming lens set

Details Image-forming lens set Image-forming lens set

2007-05-18

2009-11-17

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S716000

Reexamination Certificate

active

07619835

ABSTRACT:
An image-forming lens set includes a first lens with positive power, a second lens with negative power, an aperture stop, and a third lens with positive power, which are arranged from an object side in order. The first lens has a concave surface facing the object side and a convex surface facing the image side, and at least one of the two surfaces is a non-spherical surface. The second lens is a convex-concave lens having two non-spherical opposite surfaces including a concave surface facing the image side. The third lens has two non-spherical opposite convex surfaces. At least one of the first, second and third lenses is coated with a layer of optical film for filtering light. By means of the lenses having non-spherical surfaces, the image-forming lens set has a simple structure. By means of the optical film, the image formed in a better quality can achieve.

REFERENCES:
patent: 4139266 (1979-02-01), Koizumi
patent: 5973850 (1999-10-01), Nagaoka
patent: 6466377 (2002-10-01), Saito et al.

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