Photographic lens

Details Photographic lens Photographic lens

2006-04-18

2006-04-18

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S717000, C359S740000

Reexamination Certificate

active

07031080

ABSTRACT:
A photographic lens has a first and second positive lens. The first lens is a meniscus lens having a convex object side surface. The second lens is a double-convex lens. The photographic lens satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?5.6≦f<8;F1>F2; 0.39<F/F1≦0.5; 0.15<R1/F<0.19; 1.4<(F/R3)·f≦3.0; andR3>|R4|in-line-formulae description="In-line Formulae" end="tail"?wherein F is an overall focal length, F1is a focal length of the first lens, F2is a focal length of the second lens, f is a ratio of the overall focal length F to an effective aperture size defined by the first stop, R1is a radius of curvature of the object side surface of the first lens, R3and R4are radii of curvature of the object side spherical surface and of an average spherical surface of the image side aspherical surface of the second lens.

REFERENCES:
patent: 5812327 (1998-09-01), Doh
patent: 6097551 (2000-08-01), Kreitzer
patent: 6335835 (2002-01-01), Koike
patent: 6628463 (2003-09-01), Koike
patent: 2002-23050 (2002-01-01), None

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