Zoom lens system and image pickup apparatus including the...

Details Zoom lens system and image pickup apparatus including the... Zoom lens system and image pickup apparatus including the...

2007-04-03

2007-04-03

Richards, N. Drew (Department: 2809)

Optical: systems and elements

Lens

With variable magnification

C359S557000, C359S683000, C359S684000

Reexamination Certificate

active

11393188

ABSTRACT:
At least one exemplary embodiment is directed to a zoom lens system which includes, in order from an object side to an image side, a first lens unit of positive optical power, a second lens unit of negative optical power, a third lens unit of positive optical power, and a fourth lens unit of positive optical power. At least the second and fourth lens units are moved for zooming. The third lens unit includes, in order from the object side to the image side, three lens elements, a positive lens element, a negative lens element, and a positive lens element. The fourth lens unit includes, in order from the object side to the image side, two lens elements, a positive lens element and a negative lens element. The above-described configuration of the zoom lens system allows appropriate setting of the imaging magnification of the fourth lens unit and the focal lengths of the third and fourth lens units.

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