Macro lens

Details Macro lens Macro lens

2006-03-07

2006-03-07

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S705000, C359S740000, C359S749000, C359S754000

Reexamination Certificate

active

07009779

ABSTRACT:
A macro lens comprised of a front lens group of a retrofocus type and a rear lens group of which component lenses are aligned in the order from the closest to the subject. The front lens group includes a first lens of a negative meniscus lens having its convex surface projecting toward the object, a second lens of a positive lens having its one surface with greater curvature oriented toward the object, a third lens of a positive lens having its one surface with greater curvature oriented toward the object, a fourth lens of a negative lens having its concave surface with greater curvature oriented toward the imaging plane, fifth and sixth lenses of a junction lens in combination of a negative lens with a positive lens, the negative lens having its one surface with greater curvature oriented toward the object, across a space having an aperture stop, and a seventh lens of a positive lens having its one surface with greater curvature oriented toward the imaging plane, the rear lens group including an eighth negative lens and a ninth positive lens, the macro lens providing relations expressed as follows:in-line-formulae description="In-line Formulae" end="lead"?1.0<|F1|/Ft<1.3  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?4.0<|Fr|/Ft<6.0  (2)in-line-formulae description="In-line Formulae" end="tail"?where F1is a focal length of the first lens, Fris the focal length of the rear lens group, and Ftis the focal length of the total optics of the.

REFERENCES:
patent: 5159493 (1992-10-01), Tsutsumi
patent: 6894847 (2005-05-01), Suzuki

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