Zoom lens and image taking system

Details Zoom lens and image taking system Zoom lens and image taking system

2006-01-17

2006-01-17

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S688000, C359S765000, C359S683000, C359S685000, C359S686000, C359S740000, C359S763000, C359S774000, C359S775000

Reexamination Certificate

active

06987622

ABSTRACT:
There is disclosed a zoom lens having small variations of aberration and field angle during focusing and having a small system as a whole. The zoom lens includes a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a negative optical power, a fourth lens unit having a positive optical power, and a fifth lens unit having a positive optical power, in order from an object side to an image side. During zooming, the second lens unit and third lens unit are moved, and during focusing, the fifth lens unit is moved. The fifth lens unit consists of one negative lens element and two positive lens elements in order from the object side to the image side, and the following conditions are satisfied:in-line-formulae description="In-line Formulae" end="lead"?0<α5<0.35in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.85<ν5p/ν5n.in-line-formulae description="In-line Formulae" end="tail"?

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