Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2008-09-08
2009-11-24
Choi, William C (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S726000
Reexamination Certificate
active
07623298
ABSTRACT:
A zoom lens comprises a first lens group G1, which includes a negative focal length, a second lens group G2, which includes a positive focal length, a third lens group G3, which includes a negative focal length, a fourth lens group G4, which includes a positive focal length, and a fifth lens group G5, which includes a positive focal length, in order from nearest to furthest from a photographic subject, or with a sixth lens group G6, which includes a negative focal length, installed as an anchored lens group between the fifth lens group and an image site of the camera apparatus. The first lens group comprises a reflective optical element, the third lens group G3comprises an aperture stop, either on a side thereof in a direction of the photographic subject, on a side in a direction of the image site, or within the third lens group, and, when magnifying from a short focus end to a long focus end, an interval between the first lens group and the second lens group is reduced, an interval between the second lens group and the third lens group is increased, an interval between the third lens group and the fourth lens group is reduced, an interval between the fourth lens group and the fifth lens group is increased, and the fifth lens group moves toward the imaging site.
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Choi William C
Dickstein & Shapiro LLP
Ricoh & Company, Ltd.
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