Photography – Having variable focal length of camera objective
Reexamination Certificate
2005-03-01
2005-03-01
Perkey, W. B. (Department: 2851)
Photography
Having variable focal length of camera objective
C359S689000, C359S715000, C359S716000, C359S717000
Reexamination Certificate
active
06862408
ABSTRACT:
The object of the invention is to enhance the performance of an image pickup system comprising a zoom lens by developing an unheard-of design of the configuration of lens surfaces used in the zoom lens, thereby achieving wide-angle arrangements and reductions in the number of lens components used in such a way as to be compatible with various zoom lenses. A zoom lens used on the image pickup system comprises a plurality of lens groups G1to G4including a first lens group G1having negative power and a second lens group G2having positive power. For zooming, the spaces between the respective lens groups are designed to be variable. The zoom lens further comprises an aperture stop S, and at least one lens group having negative power comprises a negative lens component that is concave on its side facing the aperture stop. The aspheric surface is configured to have refracting power that decreases with an increasing distance from the axial axis of the zoom lens. The zoom lens complies with condition (1) regarding the depth from the apex of the aspheric surface to a position through which the farthest off-axis chief ray passes at the wide-angle end of the zoom lens and condition (2) regarding a local radius of curvature at the apex.
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Olympus Corporation
Perkey W. B.
Pillsbury & Winthrop LLP
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