Zoom lens

Details Zoom lens Zoom lens

2008-07-15

2008-07-15

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

11589054

ABSTRACT:
A zoom lens is provided and has a first group having a positive refractive power, a second group having a negative refractive power, an aperture stop, a third group having a positive refractive power and a fourth group having a positive refractive power, which groups are arranged in this order from the object side. The first group has a three-group four-lens configuration where a cemented lens of a negative lens and a positive lens, and two positive single-lenses and are disposed in this order from the object side. The second group has a three-group four-lens configuration where two single-lenses and each having a negative refractive power with a strong concave surface on the image side, and a cemented lens of a double-concave lens and a positive lens are disposed in this order from the object side.

REFERENCES:
patent: 5654826 (1997-08-01), Suzuki
patent: 6094312 (2000-07-01), Nakayama
patent: 6104547 (2000-08-01), Nanba
patent: 2003/0151828 (2003-08-01), Ozaki
patent: 2005/0088756 (2005-04-01), Yamada
patent: 3601733 (2004-10-01), None

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