US 11,307,386 B2Granted

Imaging lens

AssigneeTokyo Visionary Optics Co., Ltd.

InventorHisao Fukaya

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Abstract

There is provided an imaging lens with high-resolution which satisfies demand of the wide field of view, the low-profileness and the low F-number, and has excellent optical characteristics. An imaging lens comprises in order from an object side to an image side, a first lens having a convex surface facing the object side near an optical axis and positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having a concave surface facing the image side near the optical axis and negative refractive power, wherein an image-side surface of said seventh lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, said second lens has positive refractive power near the optical axis, and said sixth lens has plane surfaces both on the object side and the image side and is formed as a double-sided aspheric lens.

Claims20

Dependent claims

An imaging lens comprising, in order from an object side to an image side,

a first lens having a convex surface facing the object side near an optical axis and positive refractive power,
a second lens,
a third lens,
a fourth lens,
a fifth lens having a meniscus shape near the optical axis,
a sixth lens, and
a seventh lens having a concave surface facing the image side near the optical axis and negative refractive power,
wherein an image-side surface of said seventh lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, the first lens having a meniscus shape near the optical axis, an image-side surface of said fourth lens has a concave surface facing the image side near the optical axis, said fifth lens has positive refractive power near the optical axis, an object-side surface of said seventh lens has a convex surface facing the object side near the optical axis, and below conditional expressions (1), (2) and (5) are satisfied:
1.50<(D1/f1)×100<17.00 (1)
0.02<T2/T4<0.10 (2)
0.20<(T2/TTL)×100<0.90 (5)
where
D1:
a thickness along the optical axis of the first lens,
f1:
a focal length of the first lens,
T2:
a distance along the optical axis from an image-side surface of the second lens to an object-side surface of the third lens,
T4:
a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens.
T2:
a distance along the optical axis from an image-side surface of the second lens to an object-side surface of the third lens, and
TTL:
a total track length.

21 more elements

An imaging lens comprising, in order from an object side to an image side,

a first lens having a convex surface facing the object side near an optical axis and positive refractive power,
a second lens,
a third lens having negative refractive power,
a fourth lens,
a fifth lens,
a sixth lens, and
a seventh lens having a concave surface facing the image side near the optical axis and negative refractive power,
wherein an image-side surface of said seventh lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, the first lens having a meniscus shape, an image-side surface of said fourth lens has a concave surface facing the image side near the optical axis, said fifth lens has positive refractive power near the optical axis, an object-side surface of said seventh lens has a convex surface facing the object side near the optical axis, and below conditional expressions (1), (2) and (5) are satisfied:
1.50<(D1/f1)×100<17.00 (1)
0.02<T2/T4<0.10 (2)
0.20<(T2/TTL)×100<0.90 (5)
where
D1:
a thickness along the optical axis of the first lens,
f1:
a focal length of the first lens,
T2:
a distance along the optical axis from an image-side surface of the second lens to an object-side surface of the third lens, and
T4:
a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens.
T2:
a distance along the optical axis from an image-side surface of the second lens to an object-side surface of the third lens, and
TTL:
a total track length.

21 more elements

An imaging lens comprising, in order from an object side to an image side,

a first lens having a convex surface facing the object side near an optical axis and positive refractive power,
a second lens,
a third lens having negative refractive power,
a fourth lens,
a fifth lens having a meniscus shape near the optical axis,
a sixth lens, and
a seventh lens having a concave surface facing the image side near the optical axis and negative refractive power,
wherein an image-side surface of said seventh lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, the first lens having a meniscus shape near the optical axis, an image-side surface of said fourth lens has a concave surface facing the image side near the optical axis, said fifth lens has positive refractive power near the optical axis, an object-side surface of said seventh lens has a convex surface facing the object side near the optical axis, and below conditional expressions (1), (2) and (6) are satisfied:
1.50<(D1/f1)×100<17.00 (1)
0.02<T2/T4<0.10 (2)
6.70<(T4/TTL)×100<15.00 (6)
where
D1:
a thickness along the optical axis of the first lens,
f1:
a focal length of the first lens,
T2:
a distance along the optical axis from an image-side surface of the second lens to an object-side surface of the third lens, and
T4:
a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens.
T4:
a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens, and
TTL:
a total track length.

21 more elements

An imaging lens comprising, in order from an object side to an image side,

a first lens having a convex surface facing the object side near an optical axis and positive refractive power,
a second lens,
a third lens having negative refractive power,
a fourth lens,
a fifth lens,
a sixth lens, and
a seventh lens having a concave surface facing the image side near the optical axis and negative refractive power,
wherein an image-side surface of said seventh lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, the first lens having a meniscus shape near the optical axis, an image-side surface of said fourth lens has a concave surface facing the image side near the optical axis, said fifth lens has positive refractive power near the optical axis, an object-side surface of said seventh lens has a convex surface facing the object side near the optical axis, and below conditional expressions (1), (2) and (6) are satisfied:
1.50<(D1/f1)×100<17.00 (1)
0.02<T2/T4<0.10 (2)
6.70<(T4/TTL)×100<15.00 (6)
where
D1:
a thickness along the optical axis of the first lens,
f1:
a focal length of the first lens,
T2:
a distance along the optical axis from an image-side surface of the second lens to an object-side surface of the third lens, and
T4:
a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens.
T4:
a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens, and
TTL:
a total track length.

21 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/421,046Filed 23 May 2019
Priority: JP JP2018-09899723 May 2018
Published: US 2020/0150392 A114 May 2020
Granted: 19 Apr 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G02B 13/0045
Having at least one aspherical surface: having five or more lenses
G02B 9/64
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having more…
G02B
Optical elements, systems or apparatus

Family

US 2020/0150392 A1Pre-grant publication · published 14 May 2020
US 11,307,386 B2This patent

From the US filing history. Foreign family members aren’t listed.

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