Zoom lens and image pickup apparatus using the same

Details Zoom lens and image pickup apparatus using the same Zoom lens and image pickup apparatus using the same

2009-09-09

2011-10-25

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000, C359S683000, C359S684000, C359S685000, C359S689000, C359S716000, C359S740000, C359S781000, C359S783000, C359S784000

Reexamination Certificate

active

08045274

ABSTRACT:
A zoom lens includes a first lens unit with a negative refractive power, a second lens unit with a positive refractive power, and a third lens unit with a positive refractive power in order from the object side to the image side. The first lens unit includes a negative lens and a positive lens. When the curvature radius of the object side surface and that of the image side surface of the negative lens are respectively defined as R11and R12and the curvature radius of the object side surface and that of the image side surface of the positive lens are respectively defined as R21and R22, the following conditional expression is satisfied: −5.6<(R12+R21)/(R12−R21)<−4.7 and 1.5<(R11+R22)/(R11−R22)<2.3.

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