Zoom lens system and electronic imaging apparatus using the same

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United States of America Patent

PATENT NO 9784950
APP PUB NO 20150241657A1
SERIAL NO

14426558

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Abstract

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A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group. The second and third lens groups are moved during zooming. The first lens group includes a positive first sub-lens group which does not move during a focusing operation, and a positive second sub-lens group which moves during the focusing operation. The first sub-lens group includes at least one negative lens element, the second sub-lens group is a positive single lens element, and the following conditions (1) and (2) are satisfied:

description='In-line Formulae' end='lead'60<νd1b<75   (1),description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'νd1a<24  (2),description='In-line Formulae' end='tail'

wherein νd1b and νd1a_designates Abbe numbers at the d-line of the positive single lens element of the second sub-lens group and at the d-line of the negative lens element within the first sub-lens group, respectively.

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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
Ohara, Yoshimitsu Tokyo, JP 2 3
Saori, Masakazu Saitama, JP 40 376

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