Imaging-optical system

Details Imaging-optical system Imaging-optical system

2007-01-02

2007-01-02

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

11074716

ABSTRACT:
An imaging-optical system includes a negative first lens group, a positive second lens group and a positive third lens group.A zooming operation is performed by moving the second and third lens groups while an object distance to the object is being varied without varying a distance from the most object-side surface of the first lens group to the imaging plane.An in-focus state is maintained while the focal length of the imaging-optical system is being varied through the zooming operation.The first lens group includes cemented lens elements, and the cemented lens elements are positioned at the most object-side of the first lens group.The cemented lens elements satisfy the following condition:in-line-formulae description="In-line Formulae" end="lead"?0.9<Ra/fw<2.0  (1)in-line-formulae description="In-line Formulae" end="tail"?whereinRa designates the radius of curvature of a bonding surface of the cemented lens elements of the first lens group; andfw designates the focal length of the imaging-optical system at the short focal length extremity.

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U.S. Appl. No. 10/996,469 to ENOMOTO, which was filed Nov. 26, 2004.

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