Zoom lens and optical apparatus including the same

Details Zoom lens and optical apparatus including the same Zoom lens and optical apparatus including the same

2011-06-14

2011-06-14

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07961405

ABSTRACT:
A zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. The first lens unit, the second lens unit, and the third lens unit are arranged in order from an object side to an image side. The first, second and third lens units move during zooming. The first lens unit is formed by two lenses, and the third lens unit is formed by one lens. A lateral magnification of the second lens unit at a wide angle end, a focal length of the first lens unit, a focal length of the third lens unit, a focal length of the entire zoom lens at the wide angle end, and a moving amount of the first lens unit along the optical axis from the wide angle end to a telephoto end are set appropriately based on predetermined conditional expressions.

REFERENCES:
patent: 7023623 (2006-04-01), Miyatake et al.
patent: 2006-208890 (2006-08-01), None

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