Compact zoom lens

Details Compact zoom lens Compact zoom lens

1997-12-19

1999-10-12

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359676, 359684, 359685, G20B 1522

Patent

active

059662476

ABSTRACT:
A zoom lens comprises a plurality of lens elements arranged into three zooming lens units. These zooming lens units are spaced from one another by axial distances that vary during zooming. The lens units are a negative power front lens unit, a positive power middle lens unit and a negative power rear lens unit. At least one of the lens units continually moves away from the image plane, as the zoom lens zooms from a wide angle position toward a telephoto position so that the distance from this lens unit to the image plane varies in sigmoidal relation with respect to the focal length of the zoom lens.

REFERENCES:
patent: 5042926 (1991-08-01), Kikuchi
patent: 5153776 (1992-10-01), Nozawa
patent: 5270866 (1993-12-01), Oizumi et al.
patent: 5289317 (1994-02-01), Ikemori et al.
patent: 5539582 (1996-07-01), Kohno et al.

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