Zoom lens system

Details Zoom lens system Zoom lens system

2007-01-30

2007-01-30

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000

Reexamination Certificate

active

11289816

ABSTRACT:
A zoom lens system that includes lens groups G1to G5that have negative, positive, positive, negative and positive refractive power respectively in the order from a screen side is provided. The fourth lens group G4includes a cemented lens made up of a negative lens that is concave on the screen side and a convex lens. The zoom lens system satisfies conditions belowin-line-formulae description="In-line Formulae" end="lead"?1.15<f2/fw<2.0in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?50<Δvd4<70in-line-formulae description="In-line Formulae" end="tail"?where fw is a combined focal length of the zoom lens system at a wide-angle end, f2is a combined focal length of the second lens group, and Δvd4is a difference in the respective Abbe numbers vd of lenses composing the cemented lens in the fourth lens group G4.

REFERENCES:
patent: 6515803 (2003-02-01), Hirose
patent: 6545817 (2003-04-01), Hirose
patent: 2002-148516 (2002-05-01), None

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