Variable magnification optical system and imaging apparatus

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United States of America Patent

PATENT NO 9395522
APP PUB NO 20130329121A1
SERIAL NO

13965686

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Abstract

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A variable magnification optical system consists of a negative first lens group, a stop that is fixed relative to an image plane during magnification change, and a positive second lens group, which are in this order from an object side. A distance between the first lens group and the second lens group in an optical axis direction becomes shorter when magnification is changed from a wide-angle end to a telephoto end. The first lens group consists of a positive lens having a convex object-side surface and two negative lenses, in this order from the object side. The variable magnification optical system satisfies the following formula (1) about Abbe number νd1 of the positive lens in the first lens group for d-line:

description='In-line Formulae' end='lead'25.5<νd1<50  (1).description='In-line Formulae' end='tail'

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Patent Owner(s)

  • FUJIFILM CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ono, Kazunori Saitama-ken, JP 28 141

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