Imaging lens including seven lenses of ++−++−− or ++−+++− refractive powers

Patent metadata

Field	Value
Publication number	US-12050307-B2
Application number	US-202117406811-A
Country	US
Kind code	B2
Filing date	Aug 19, 2021
Priority date	Aug 19, 2020
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

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 with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, 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, said second lens has an image-side surface being convex in a paraxial region, said third lens has an object-side surface being concave in a paraxial region, said fourth lens has an object-side surface being concave in a paraxial region, said sixth lens has an object-side surface being convex in a paraxial region, and said seventh lens has an image-side surface being concave in a paraxial region.

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 with positive refractive power,
a third lens with negative refractive power,
a fourth lens with positive refractive power,
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, said second lens has an image-side surface being convex in a paraxial region, said third lens has an object-side surface being concave in a paraxial region, said fourth lens has an object-side surface being concave in a paraxial region, said sixth lens has an object-side surface being convex in a paraxial region, and said seventh lens has an image-side surface being concave in a paraxial region.

2. The imaging lens according to claim 1 , wherein an object-side surface of said seventh lens is convex in a paraxial region.

3. The imaging lens according to claim 1 , wherein the following conditional expression (1) is satisfied:
0.02<( D 6/| f 6|)×100<2.55  (1)

where
D6: a thickness along the optical axis of the sixth lens, and
f6: a focal length of the sixth lens.

4. The imaging lens according to claim 1 , wherein the following conditional expression (2) is satisfied:
0.50< f 1/ f< 1.70  (2)

where
f1: a focal length of the first lens, and
f: a focal length of the overall optical system of the imaging lens.

5. The imaging lens according to claim 1 , wherein the following conditional expression (3) is satisfied:
3.75< f 5/ f< 17.50  (3)

where
f5: a focal length of the fifth 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 (4) is satisfied:
0.20<( f 1/| f 6|)×100<35.00  (4)

where
f1: a focal length of the first lens, and
f6: a focal length of the sixth lens.

7. The imaging lens according to claim 1 , wherein the following conditional expression (5) is satisfied:
0.60< r 13/ f< 3.50  (5)

where
r13: a paraxial curvature radius of an object-side surface of the seventh lens, and
f: a focal length of the overall optical system of the imaging lens.

Assignees

• Tokyo Visionary Optics Co Ltd

Inventors

• Sekine Yukio
• Yang Ruidong

Classifications

• G02B9/64

  having more than six components · 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

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B13/0015 Primary

  characterised by the lens design · CPC title