Granted Patent B2

US 12,313,819 · App. 17/743,326 · Granted May 27, 2025

Inventors: Po-Lun Hsu (Taichung, TW); Tzu-Chieh Kuo (Taichung, TW)

Assignee: LARGAN PRECISION CO., LTD.

G02B13/004G02B3/14G02B7/04G02B9/34G02B27/64

Abstract

Claims (173)

1. An optical imaging lens assembly, comprising:

a focus tunable component; and

an imaging lens system comprising, in order from an object side to an image side, a first lens group and a second lens group, wherein the first lens group comprises, in order from the object side to the image side, an object-side first lens element and an object-side second lens element, the second lens group comprises, in order from the image side to the object side, an image-side first lens element and an image-side second lens element, and each of all lens elements in the imaging lens system has an object-side surface facing toward the object side and an image-side surface facing toward the image side;

wherein at least one lens surface of at least one lens element in the imaging lens system is aspheric and has at least one inflection point, the imaging lens system has a total of at least seven lens elements, the lens elements of the first lens group are closer to the object side than other lens elements in the imaging lens system, and the lens elements of the second lens group are closer to the image side than other lens elements in the imaging lens system;

wherein each of at least three lens elements in the imaging lens system has an Abbe number smaller than 40.0;

wherein an axial distance between the image-side first lens element and the image-side second lens element is DLr1Lr2, a central thickness of the image-side first lens element is CTLr1, a focal length of the optical imaging lens assembly is f, and a focal length of the focus tunable component is ft, and the following conditions are satisfied:

0.6

<

DLr

⁢

1

⁢

Lr

⁢

2

/

CTLr

⁢

1

;

and

⁢

❘

"\[LeftBracketingBar]"

f

/

ft

❘

"\[RightBracketingBar]"

<

0.4

.

2. The optical imaging lens assembly of claim 1 , wherein a maximum value among refractive indices of all lens elements in the imaging lens system is Nimax, a minimum value among Abbe numbers of all lens elements in the imaging lens system is Vimin, and the following conditions are satisfied:

1.66

<

Nimax

<

1.75

;

and

10.

<

Vimin

<

20.

.

3. The optical imaging lens assembly of claim 1 , wherein an axial distance between the object-side surface of the object-side first lens element and the image-side surface of the image-side first lens element is TDi, a central thickness of the focus tunable component is CTt, the focal length of the optical imaging lens assembly is f, the focal length of the focus tunable component is ft, an axial distance between an imaged object and a surface of the optical imaging lens assembly closest to the object side is TOB, and the following conditions are satisfied:

5

.

0

⁢

0

<

TDi

/

CTt

<

30.

;

and

❘

"\[LeftBracketingBar]"

f

/

TOB

-

f

/

f

⁢

t

❘

"\[RightBracketingBar]"

<

1.

E

-

2.

4. The optical imaging lens assembly of claim 1 , wherein an axial distance between the object-side surface of the object-side first lens element and an image surface is TLi, an entrance pupil diameter of the imaging lens system is EPDi, half of a maximum field of view of the optical imaging lens assembly is HFOV, and the following conditions are satisfied:

1

.

0

<

TLi

/

EPDi

<

3.

;

and

15.

[

deg

.

]

<

HFOV

<

90.

[

deg

.

]

.

5. The optical imaging lens assembly of claim 1 , wherein a focal length of the imaging lens system is fi, a focal length of a seventh lens element counting from the object side to the image side in the imaging lens system is fLf7, a maximum effective radius of the image-side surface of the seventh lens element is YLf7r, an axial distance between the object-side surface of the object-side first lens element and the image-side surface of the seventh lens element is DLf1fLf7r, and the following conditions are satisfied:

0.4

<

❘

"\[LeftBracketingBar]"

fi

/

fLf

⁢

7

❘

"\[RightBracketingBar]"

<

1.5

;

and

0.5

<

YLf

⁢

7

⁢

r

/

DLf

⁢

1

⁢

fLf

⁢

7

⁢

r

<

0.95

.

6. The optical imaging lens assembly of claim 1 , wherein an f-number of the optical imaging lens assembly is Fno, a maximum effective radius of the object-side surface of the object-side first lens element is YLf1f, a maximum effective radius of the image-side surface of the image-side first lens element is YLr1r, and the following conditions are satisfied:

1

.0

<

Fno

<

2.5

;

and

1.5

<

YLr

⁢

1

⁢

r

/

YLf

⁢

1

⁢

f

<

5.

.

7. The optical imaging lens assembly of claim 1 , wherein at least one lens surface of at least one lens element of the second lens group has at least one critical point in an off-axis region thereof.

8. The optical imaging lens assembly of claim 7 , wherein the object-side first lens element has positive refractive power, the object-side second lens element has negative refractive power, the image-side second lens element has positive refractive power, the image-side first lens element has negative refractive power, and the object-side surface of the image-side first lens element has at least one critical point in an off-axis region thereof.

9. The optical imaging lens assembly of claim 1 , wherein the focus tunable component is located on the object side of the imaging lens system, the focus tunable component is a liquid lens set, and the liquid lens set comprises a transparent substrate and a liquid material.

10. An image capturing unit, comprising:

the optical imaging lens assembly of claim 1 ; and

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

11. An electronic device, comprising:

the image capturing unit of claim 10 .

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (49)