Zoom lens system, interchangeable lens, and imaging apparatus

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 11307393
APP PUB NO 20200292797A1
SERIAL NO

16808523

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A zoom lens satisfies Conditional Expression (1) as follows:

description='In-line Formulae' end='lead'−20<Twt/Twm<1,  (1)description='In-line Formulae' end='tail'

Twt is a moving amount of the second lens group during zooming from the short focal-length end to the long focal-length end, a moving amount to the object side being indicated by a positive sign, a moving amount to an image side being indicated by a negative sign, and

Twm is a moving amount of the second lens group during zooming from the short focal-length end to an intermediate focal length, a moving amount to the image side being indicated by a negative sign,

the intermediate focal length being expressed by fm=(fw·ft)1/2, where fw is a focal length of a whole system at the short focal-length end, and ft is a focal length of the whole system at the long focal-length end.

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Patent Owner(s)

  • RICOH COMPANY, LTD.

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Koga, Tomoya Tokyo, JP 11 21
Nakayama, Takahiro Kanagawa, JP 115 1142

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