Zoom lens system

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United States of America Patent

PATENT NO 9798122
SERIAL NO

14875926

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Abstract

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A zoom lens system includes a positive first lens group, a negative second lens group, in that order from the object side, and a positive nth lens group provided closest to the image side. During zooming from the short to long focal length extremities, the first lens group and the nth lens group remain stationary and the second lens group moves. A positive mth lens group is provided between the second and nth lens groups. The following conditions (1) and (2) are satisfied:

description='In-line Formulae' end='lead'1.23<f1/fn<1.50  (1), anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'1.20<fn/fm<1.60  (2),description='In-line Formulae' end='tail'

wherein f1, fn and fm designate the focal lengths of the first, nth and mth lens groups, respectively, wherein n is a positive integer of 4 or greater, and m is a positive integer of 3 or greater.

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Patent Owner(s)

Patent OwnerAddress
RICOH IMAGING COMPANY LTD2-35-7 MAENO-CHO ITABASHI-KU TOKYO 174-8639

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Saori, Masakazu Saitama, JP 40 376

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