Zoom lens and image pickup apparatus equipped with same

Details Zoom lens and image pickup apparatus equipped with same Zoom lens and image pickup apparatus equipped with same

2009-05-05

2011-12-20

Blackman, Rochelle-Ann J (Department: 2862)

Television

Camera, system and detail

Optics

C348S240300, C396S082000, C396S085000, C359S687000, C359S689000, C359S695000, C359S740000, C359S793000

Reexamination Certificate

active

08081253

ABSTRACT:
A zoom lens has a negative object side lens unit (or first lens unit G1), a positive image side lens unit (or third lens unit G3), a positive intermediate lens unit (or second lens unit G2), and an aperture stop. The distance between the object side lens unit and the intermediate lens unit is smaller at the telephoto end than at the wide angle end, the distance between the intermediate lens unit and the image side lens unit is larger at the telephoto end than at the wide angle end, the intermediate lens unit moves in such a way that it is located closer to the object side at the telephoto end than at the wide angle end, the image side lens unit moves in such a way that it is located closer to the image side at the telephoto end than at the wide angle end, the aperture stop moves integrally with the intermediate lens unit. The image side lens unit is composed of two lens component including a front lens component and a positive rear lens component arranged in the mentioned order from the object side. The absolute value of the paraxial radius of curvature of the image side lens surface of the front lens component is smaller than the absolute value of the paraxial radius of curvature of the object side surface of the rear lens component.

REFERENCES:
patent: 6452729 (2002-09-01), Yamamoto
patent: 2001/0036020 (2001-11-01), Yamamoto
patent: 2006/0072211 (2006-04-01), Imamura
patent: 2001-343587 (2001-12-01), None
patent: 2005-338344 (2005-12-01), None

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