Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2009-06-24
2010-12-21
Collins, Darryl J (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S686000
Reexamination Certificate
active
07855842
ABSTRACT:
A zoom lens unit including, in order from an object side to an image surface 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 when changing magnification from a wide-angle end to a telephoto end, an interval between the first lens group and the second lens group increases, an interval between the second lens group and the third lens group decreases, and an interval between the third lens group and the fourth lens group increases, wherein when performing focusing on a close range object at least at the telephoto end, with reference to a focused state on an infinite object, the first lens group and the second lens group are fixed, the third lens group is capable of being moved to the image surface side, and the fourth lens group is capable of being moved to the object side.
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Extended European Search Report and Search Opinion, Oct. 28, 2009.
Collins Darryl J
Dickstein & Shapiro LLP
Ricoh & Company, Ltd.
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