Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-11-09
2009-06-23
Choi, William C (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
Reexamination Certificate
active
07551365
ABSTRACT:
A zoom lens in the present invention is composed of a first lens group G1having a fixed distance from the image plane side and negative refracting power, a second lens group G2having positive refracting power and moving during zooming, a third lens group G3having positive refracting power and moving during zooming, and a fourth lens group G4having a fixed distance from the image plane side and positive refracting power. The first, the second, the third and the fourth lens groups G1-G4are arranged in order from the object side to the image plane side. The third lens group G3includes an aperture stop s, a lens13having positive refracting power and a lens14having negative refracting power, being arranged in order from the object side to the image plane side. The zoom lens is high performance and large in zoom ratio and is compact due to the simple structure.
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Choi William C
Conlin David G.
Edwards Angell Palmer & & Dodge LLP
Sharp Kabushiki Kaisha
Tucker David A.
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