Granted Patent B2

US 12,468,124 · App. 18/126,334 · Granted Nov 11, 2025

Inventors: Yu Jui Lin (Taichung, TW); Tzu-Chieh Kuo (Taichung, TW)

Assignee: LARGAN PRECISION CO., LTD.

G02B9/64G02B13/0045G02B13/04

Abstract

Claims (271)

1 . An imaging system lens assembly comprising eight lens elements, the eight 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, a seventh lens element and an eighth lens element, and each of the eight 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 object-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the first lens element has at least one inflection point in an off-axis region thereof, the fifth lens element has positive refractive power, the eighth lens element has positive refractive power, the object-side surface of the eighth lens element is convex in a paraxial region thereof, the image-side surface of the eighth lens element is concave in a paraxial region thereof, the image-side surface of the eighth lens element has at least one inflection point in an off-axis region thereof, and at least one of the object-side surface and the image-side surface of at least one of the second lens element through the seventh lens element has at least one inflection point in an off-axis region thereof;

wherein half of a maximum field of view of the imaging system lens assembly is HFOV, a curvature radius of the object-side surface of the eighth lens element is R15, a curvature radius of the image-side surface of the eighth lens element is R16, a focal length of the eighth lens element is f8, and the following conditions are satisfied:

40.

degrees

<

HFOV

;

and

0.4

<

(

R

⁢

1

⁢

5

+

R

⁢

1

⁢

6

)

/

f

⁢

8

<

1

⁢

8

.

2 . The imaging system lens assembly of claim 1 , wherein half of the maximum field of view of the imaging system lens assembly is HFOV, the curvature radius of the object-side surface of the eighth lens element is R15, the curvature radius of the image-side surface of the eighth lens element is R16, the focal length of the eighth lens element is f8, and the following conditions are satisfied:

60.

degrees

<

HFOV

<

90.

degrees

;

and

⁢

1.

2

<

(

R

⁢

1

⁢

5

+

R

⁢

1

⁢

6

)

/

f

⁢

8

<

9

.

0

.

3 . The imaging system lens assembly of claim 1 , wherein an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, an Abbe number of the sixth lens element is V6, an Abbe number of the seventh lens element is V7, and the following condition is satisfied:

1

⁢

8

<

(

V

⁢

4

+

V

⁢

5

)

/

(

V

⁢

6

+

V

⁢

7

)

<

6

.

0

.

4 . The imaging system lens assembly of claim 1 , wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, an entrance pupil diameter of the imaging system lens assembly is EPD, a maximum image height of the imaging system lens assembly is ImgH, a focal length of the imaging system lens assembly is f, and the following conditions are satisfied:

5

.

0

<

TL

/

EPD

<

8.

;

and

⁢

4

<

ImgH

/

f

<

3

.

0

.

5 . The imaging system lens assembly of claim 1 , wherein a sum of axial distances between each of all adjacent lens elements of the imaging system lens assembly is ΣAT, a central thickness of the sixth lens element is CT6, and the following condition is satisfied:

2.8

<

∑

AT

/

CT

⁢

6

<

15.

6 . The imaging system lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the first lens element is R1, a focal length of the first lens element is f1, and the following condition is satisfied:

0

.

3

⁢

0

<

R

⁢

1

/

f

⁢

1

<

1.5

.

7 . The imaging system lens assembly of claim 1 , wherein 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 condition is satisfied:

1.

3

<

R

⁢

1

⁢

0

/

R

⁢

11

<

7

.

0

.

8 . The imaging system lens assembly of claim 1 , wherein a composite focal length of the fourth lens element, the fifth lens element and the sixth lens element is f456, a focal length of the imaging system lens assembly is f, and the following condition is satisfied:

1.

0

<

f

⁢

4

⁢

5

⁢

6

/

f

<

1

⁢

5

.

9 . The imaging system lens assembly of claim 1 , wherein a focal length of the seventh lens element is f7, a curvature radius of the object-side surface of the seventh lens element is R13, a curvature radius of the image-side surface of the seventh lens element is R14, and the following condition is satisfied:

-

1

⁢

8

<

f

⁢

7

/

R

⁢

13

+

f

⁢

7

/

R

⁢

14

<

-

1.9

.

10 . The imaging system lens assembly of claim 1 , wherein the image-side surface of the fifth lens element is convex in a paraxial region thereof, the image-side surface of the sixth lens element is convex in a paraxial region thereof, the object-side surface of the seventh lens element is convex in a paraxial region thereof,

a vertical distance between a critical point on the object-side surface of the seventh lens element and an optical axis is Yc71, a maximum effective radius of the object-side surface of the seventh lens element is Y71, and the object-side surface of the seventh lens element has at least one critical point in an off-axis region thereof satisfying the following condition:

0

.

3

⁢

5

<

Y

⁢

c

⁢

7

⁢

1

/

Y

⁢

7

⁢

1

<

0

.

8

⁢

0

.

11 . The imaging system lens assembly of claim 1 , wherein the object-side surface of the eighth lens element has at least one critical point in an off-axis region thereof,

a vertical distance between a critical point on the image-side surface of the eighth lens element and an optical axis is Yc82, a maximum effective radius of the image-side surface of the eighth lens element is Y82, and the image-side surface of the eighth lens element has at least one critical point in an off-axis region thereof satisfying the following condition:

0

.

3

⁢

0

<

Y

⁢

c

⁢

8

⁢

2

/

Y

⁢

8

⁢

2

<

0

.

8

⁢

5

.

12 . An image capturing unit, comprising:

the imaging system lens assembly of claim 1 ; and

an image sensor disposed on an image surface of the imaging system lens assembly.

13 . An electronic device, comprising:

the image capturing unit of claim 12 .

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (21)