Optical: systems and elements – Lens – Including a nonspherical surface
Reexamination Certificate
2005-11-29
2005-11-29
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
Including a nonspherical surface
C359S785000, C359S791000
Reexamination Certificate
active
06970306
ABSTRACT:
A bright, small, and inexpensive imaging lens system is provided with a short total length that can provide more than a 30 degree viewing angle and whose aberrations are excellently corrected. The imaging lens includes, in order from an object side, a positive first lens with a convex surface facing the object side, an aperture stop provided on the object side or an image side of the first lens, a meniscus second lens with a concave surface facing the object side, and a meniscus third lens with a convex surface facing the object side. Furthermore, at least one of the first lens and the second lens includes an aspheric surface, and the third lens is a biaspheric lens. In addition, the second lens and the third lens have paraxial focal lengths whose signs are different. When v max and v min are the maximum Abbe number and the minimum Abbe number among the lenses, respectively, the condition, 1.25<v max/v min, is satisfied.
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Communication from Japanese Patent Office re: related application.
Choi William
Epps Georgia
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
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