Projection zoom lens and projection type display device

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United States of America Patent

PATENT NO 9423599
APP PUB NO 20150015967A1
SERIAL NO

14501086

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Abstract

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A projection zoom lens in which a magnification change operation is performed by moving three to four lens groups as moving groups, wherein a first lens group, which is a lens group on the most-magnification side, substantially consists of a moving group having a negative refractive power; a lens group on the most-reduction side is composed of a moving group having a positive refractive power; and the first lens group which is the lens group the most-magnification side substantially consists of two lenses. In this case, conditional formula (1) below is satisfied, where fw is the focal length of the entire system at the wide angle end and fm is the focal length of the lens group on the most-magnification side:

description='In-line Formulae' end='lead'−3.5<fm/fw<−1.0  (1).description='In-line Formulae' end='tail'

This achieves miniaturization and cost reduction, and corrects various aberrations satisfactorily.

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Patent Owner(s)

Patent OwnerAddress
FUJIFILM CORPORATION26-30 NISHIAZABU 2-CHOME MINATO-KU TOKYO 106-8620

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Amano, Masaru Saitama, JP 82 294

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