Single focal length lens and optical apparatus using the same

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United States of America Patent

PATENT NO 10073255
APP PUB NO 20180031813A1
SERIAL NO

15494687

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Abstract

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A single focal length lens includes an aperture stop and first through fourth lens units having, respectively, negative refractive power, positive refractive power, negative refractive power, and positive refractive power. Positions of the first, second, and fourth lens units are fixed. When focusing from an object at infinity to an object at a short distance, the third lens unit moves toward the image side. Conditional expressions (1), (2), and (3) are satisfied:

description='In-line Formulae' end='lead'−5<f1/f<−0.5  (1),description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'−10<f3/f<−1  (2), anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'0.5<f12/f<1  (3),description='In-line Formulae' end='tail'

    where f1 denotes a focal length of the first lens unit, f denotes a focal length of an overall single focal length lens system when focusing to an object at infinity, f3 denotes a focal length of the third lens unit, and f12 denotes a combined focal length of the first and second lens units.

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Patent Owner(s)

Patent OwnerAddress
OM DIGITAL SOLUTIONS CORPORATION49-3 TAKAKURAMACHI HACHIOJI-CITY TOKYO 192-0033

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Morooka, Masaru Akishima, JP 46 370
Nagasawa, Kenichi Hachioji, JP 144 1357

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