Imaging optical system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 10082648
APP PUB NO 20170269334A1
SERIAL NO

15450456

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An imaging optical system includes a positive or negative first lens group including a negative lens element closest to the object, a diaphragm, and a positive second lens group. The negative lens element closest to the object has an object-side aspherical surface including a paraxial convex surface, a paraxial curvature that is the greatest within the effective aperture, and a portion within the effective aperture having a curvature less than ½ of the paraxial curvature. These conditions are satisfied:

description='In-line Formulae' end='lead'R1/f<1.35description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'D1/f>0.4description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'−2.5<f1/f<−1.3description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'V>56description='In-line Formulae' end='tail'

    “f” designates the overall focal length; f1, R1 and D1 respectively designate the focal length, paraxial radius of curvature of an object-side surface, and thickness, of the negative lens element closest to the object; and V designates the Abbe number regarding the d-line of a lens element, within the second lens group, closest to the diaphragm.

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Patent Owner(s)

  • 501 HOYA CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Takakubo, Yutaka Saitama, JP 28 196
Usui, Akitoshi Tokyo, JP 5 29

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