Imaging lens

Patent metadata

Field	Value
Publication number	US-12379577-B2
Application number	US-202117456515-A
Country	US
Kind code	B2
Filing date	Nov 24, 2021
Priority date	Nov 24, 2020
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens with positive refractive power, a sixth lens, and a seventh lens with negative refractive power, wherein said first lens has an object-side surface being convex in a paraxial region, and said fifth lens has an image-side surface being convex in a paraxial region, and predetermined conditional expressions are satisfied.

First claim

What is claimed is:

1. An imaging lens comprising, in order from an object side to an image side,
a first lens with positive refractive power,
a second lens,
a third lens,
a fourth lens,
a fifth lens with positive refractive power,
a sixth lens, and
a seventh lens with negative refractive power,
wherein said first lens has an object-side surface being convex in a paraxial region, and said fifth lens has an image-side surface being convex in a paraxial region, and the following conditional expressions (1), (2), (3), (4) and (5) are satisfied:
13.00< vd 3<33.5  (1)

13.00< vd 4<31.0  (2)

−3.00<| r 13|/ f 7<−0.25  (3)

2.2 mm< f 5 ×T 4  (4)

1.7< r 12/| r 9| x|r 6|<18.0  (5)

where
vd3: an abbe number at d-ray of the third lens,
vd4: an abbe number at d-ray of the fourth lens,
r13: a paraxial curvature radius of an object-side surface of the seventh lens,
f7: a focal length of the seventh lens,
f5: a focal length 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,
r12: a paraxial curvature radius of an image-side surface of the sixth lens,
r9: a paraxial curvature radius of an object-side surface of the fifth lens, and
r6: a paraxial curvature radius of an image-side surface of the third lens.

2. The imaging lens according to claim 1 , wherein the following conditional expression (6) is satisfied:
3.4<| f 4|/ f< 31.0  (6)

where
f4: a focal length of the fourth lens, and
f: a focal length of the overall optical system of the imaging lens.

3. The imaging lens according to claim 1 , wherein the following conditional expression (7) is satisfied:
0.1< r 2/| r 6|<1.5  (7)

where
r2: a paraxial curvature radius of an image-side surface of the first lens, and
r6: a paraxial curvature radius of an image-side surface of the third lens.

4. The imaging lens according to claim 1 , wherein the following conditional expression (8) is satisfied:
0.1<| r 6/ r 7|<5.0  (8)

where
r6: a paraxial curvature radius of an image-side surface of the third lens, and
r7: a paraxial curvature radius of an object-side surface of the fourth lens.

5. The imaging lens according to claim 1 , wherein the following conditional expression (9) is satisfied:
0.8<| r 7|/ f< 7.0  (9)

where
r7: a paraxial curvature radius of an object-side surface of the fourth lens, and
f: a focal length of the overall optical system of the imaging lens.

6. The imaging lens according to claim 1 , wherein the following conditional expression (10) is satisfied:
1.2<| r 8|/ f< 35.0  (10)

where
r8: a paraxial curvature radius of an image-side surface of the fourth lens, and
f: a focal length of the overall optical system of the imaging lens.

7. The imaging lens according to claim 1 , wherein the following conditional expression (11) is satisfied:
−0.75< r 10/ f 5<0.00  (11)

where
r10: a paraxial curvature radius of an image-side surface of the fifth lens, and
f5: a focal length of the fifth lens.

Assignees

• Tokyo Visionary Optics Co Ltd

Inventors

• Sekine Yukio
• Tokuno Koki

Classifications

• G02B9/64 Primary

  having more than six components · CPC title

• G02B13/0045

  having five or more lenses · CPC title

• G03B30/00

  Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles · CPC title

• G02B13/18 Primary

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title

• G02B13/0015 Primary

  characterised by the lens design · CPC title