Optical device

Details Optical device Optical device

2007-11-20

2007-11-20

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S740000, C359S793000, C359S756000, C359S761000, C359S762000, C359S649000

Reexamination Certificate

active

11680950

ABSTRACT:
A front group is formed of a negative first lens as a meniscus lens which is convex at the object side and a negative second lens, and a rear group is formed of a biconvex positive third lens, an aperture stop, a negative fourth lens and a biconvex positive fifth lens. The first lens is a glass lens, and the second lens is a plastic aspherical lens. The following conditions are satisfied: −2.4<fI/f<−1.55, 0.15<f2/f1<0.35, va<29, and vb>50, where f denotes a focal distance of a whole system, f1 denotes a focal distance of the first lens, f2 denotes a focal distance of the second lens, fI denotes a focal distance of the front group, va denotes an average value of abbe numbers of the third and the forth lenses, and vb denotes an average value of abbe numbers of the rest of the lenses.

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Office Action for corresponding European Patent Application Ser. No. EP 07003435.0.

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