US 2025/0052982 A1Published application

Imaging lens system, image capturing unit and electronic device

AssigneeLargan Industrial Optics Co., Ltd.

InventorsShiu Sheng LI, Cheng-Yu TSAI

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Abstract

An imaging lens system includes seven lens elements which are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The first lens element has negative refractive power. The image-side surface of the fifth lens element is convex in a paraxial region thereof. The sixth lens element has negative refractive power. The object-side surface of the sixth lens element is concave in a paraxial region thereof. At least one of the object-side surface and the image-side surface of at least one of the seven lens elements has at least one inflection point.

Claims29

Dependent claims

An imaging lens system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, and each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;

wherein the first lens element has negative refractive power, the image-side surface of the fifth lens element is convex in a paraxial region thereof, the sixth lens element has negative refractive power, the object-side surface of the sixth lens element is concave in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of at least one of the seven lens elements has at least one inflection point;
wherein a focal length of the imaging lens system is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, an axial distance between the object-side surface of the first lens element and the image-side surface of the third lens element is Dr1r6, an axial distance between the object-side surface of the fourth lens element and the image-side surface of the seventh lens element is Dr7r14, an Abbe number of the second lens element is V2, a refractive index of the second lens element is N2, a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, a curvature radius of the image-side surface of the fifth lens element is R10, a curvature radius of the object-side surface of the sixth lens element is R11, and the following conditions are satisfied:
0.05
<
f
/
TL
<
0.35
;
1.4
<
Dr
⁢
7
⁢
r
⁢
14
/
Dr
⁢
1
⁢
r
⁢
6
<
3
.00
;
5.
<
V
⁢
2
/
N
⁢
2
<
1
⁢
6
.00
;
0.1
<
(
R
⁢
7
-
R
⁢
8
)
/
(
R
⁢
7
+
R
⁢
8
)
<
3
.50
;
and
0.03
<
R
⁢
11
/
R
⁢
10
<
5
.
0
⁢
0
.

85 more elements

wherein the first lens element has negative refractive power, the fourth lens element has positive refractive power, the sixth lens element has negative refractive power, the object-side surface of the sixth lens element is concave in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of at least one of the seven lens elements has at least one inflection point;
wherein a focal length of the imaging lens system is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, an axial distance between the object-side surface of the first lens element and the image-side surface of the third lens element is Dr1r6, an axial distance between the object-side surface of the fourth lens element and the image-side surface of the seventh lens element is Dr7r14, an Abbe number of the second lens element is V2, a refractive index of the second lens element is N2, a curvature radius of the image-side surface of the first lens element is R2, a curvature radius of the image-side surface of the second lens element is R4, a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fifth lens element is R10, and the following conditions are satisfied:
0.05
<
f
/
TL
<
0.3
;
⁢
1.4
<
Dr
⁢
7
⁢
r
⁢
14
/
Dr
⁢
1
⁢
r
⁢
6
<
3.
;
⁢
5.
<
V
⁢
2
/
N
⁢
2
<
16.
;
⁢
0.1
<
(
R
⁢
7
-
R
⁢
10
)
/
(
R
⁢
7
+
R
⁢
10
)
<
3.
;
and
⁢
0
<
❘
"\[LeftBracketingBar]"
R
⁢
2
/
R
⁢
4
❘
"\[RightBracketingBar]"
<
0.8
.

84 more elements

wherein the first lens element has negative refractive power, the image-side surface of the fourth lens element is convex in a paraxial region thereof, the fifth lens element has positive refractive power, the object-side surface of the fifth lens element is convex in a paraxial region thereof, the sixth lens element has negative refractive power, and at least one of the object-side surface and the image-side surface of at least one of the seven lens elements has at least one inflection point;
wherein a focal length of the imaging lens system is f, a focal length of the first lens element is f1, a focal length of the seventh lens element is f7, an axial distance between the object-side surface of the first lens element and an image surface is TL, an axial distance between the object-side surface of the first lens element and the image-side surface of the third lens element is Dr1r6, an axial distance between the object-side surface of the fourth lens element and the image-side surface of the seventh lens element is Dr7r14, an Abbe number of the second lens element is V2, a refractive index of the second lens element is N2, a sum of central thicknesses of all lens elements of the imaging lens system is ΣCT, a sum of all axial distances between adjacent lens elements of the imaging lens system is ΣAT, and the following conditions are satisfied:
0.05
<
f
/
TL
<
0.28
;
⁢
1.4
<
Dr
⁢
7
⁢
r
⁢
14
/
Dr
⁢
1
⁢
r
⁢
6
<
3.
;
⁢
5.
<
V
⁢
2
/
N
⁢
2
<
16.
;
⁢
0.1
<
Σ
⁢
CT
/
Σ
⁢
AT
<
3.
;
and
⁢
0
<
❘
"\[LeftBracketingBar]"
f
⁢
1
/
f
⁢
7
❘
"\[RightBracketingBar]"
<
1.
.

72 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/376,761Filed 4 Oct 2023
Priority: TW 11213034111 Aug 2023
Published: 13 Feb 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G02B 9/62
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having six…
G02B 13/0045
Having at least one aspherical surface: having five or more lenses
B60R 1/27
With a predetermined field of view: providing all-round vision, e.g. using omnidirectional cameras
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…