Zoom lens, optical apparatus equipped with the zoom lens and...

Details Zoom lens, optical apparatus equipped with the zoom lens and... Zoom lens, optical apparatus equipped with the zoom lens and...

2011-03-15

2011-03-15

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S772000

Reexamination Certificate

active

07907354

ABSTRACT:
A zoom lens comprises the following lens groups in the order from an object side: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; and a fourth lens group having a positive refracting power; wherein, upon zooming, at least the first lens group and the fourth lens group move to the object side; and wherein the third lens group comprises a negative meniscus lens with a convex surface on an image side and with both side faces thereof being exposed to air, which is located nearest to the image side.

REFERENCES:
patent: 5798872 (1998-08-01), Uzawa
patent: 7136231 (2006-11-01), Ito et al.
patent: 7251081 (2007-07-01), Sato
patent: 7583450 (2009-09-01), Ishii
patent: 2007/0014032 (2007-01-01), Otake
patent: 2007-003554 (2007-01-01), None

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