OPTICAL IMAGING LENS ASSEMBLY, IMAGE CAPTURING APPARATUS AND ELECTRONIC DEVICE

• US 20180031807A1
• Filed: 01/31/2017
• Published: 02/01/2018
• Est. Priority Date: 07/28/2016
• Status: Abandoned Application

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: Chen, Chun-Yen, Yang, Shu-Yun
• Application Number:
  US15/421,318
• Publication Number:
  US 20180031807A1
• Time in Patent Office: Days
• CPC Class Codes: G02B 13/0045 having five or more lenses
• CPC Class Codes: G02B 13/06 Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
• CPC Class Codes: G02B 9/64 having more than six components

Abstract

An optical imaging lens assembly includes, in order from an object side to an image side, 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. The first lens element has negative refractive power. The second lens element has negative refractive power. The third lens element has positive refractive power. The fourth lens element has positive refractive power. The fifth lens element has negative refractive power. The seventh lens element has an object-side surface and an image-side surface being both aspheric, wherein at least one of the object-side surface and the image-side surface of the seventh lens element includes at least one inflection point.

Claims

1. An optical imaging lens assembly comprising, in order from an object side to an image side:

a first lens element having negative refractive power;

a second lens element having negative refractive power;

a third lens element having positive refractive power;

a fourth lens element having positive refractive power;

a fifth lens element having negative refractive power;

a sixth lens element; and

a seventh lens element having an object-side surface and an image-side surface being both aspheric, wherein at least one of the object-side surface and the image-side surface of the seventh lens element comprises at least one inflection point;

wherein the optical imaging lens assembly has a total of seven lens elements, a focal length of the optical imaging lens assembly is f, an axial distance between the sixth lens element and the seventh lens element is T67, a central thickness of the third lens element is CT3, a central thickness of the sixth lens element is CT6, and the following conditions are satisfied;

0<

f/T67<

9.0; and

0.05<

CT6/CT3<

0.85.

2. The optical imaging lens assembly of claim 1, wherein the second lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.

3. The optical imaging lens assembly of claim 1, wherein the image-side surface of the seventh lens element is concave in a paraxial region thereof.

4. The optical imaging lens assembly of claim 1, wherein the fifth lens element has an image-side surface being concave in a paraxial region thereof, a curvature radius of an image-side surface of the first lens element is R2, a curvature radius of an image-side surface of the second lens element is R4, and the following condition is satisfied:

1.65<

R2/R4<

5.0.

5. The optical imaging lens assembly of claim 1, wherein the central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, the central thickness of the sixth lens element is CT6, and the following condition is satisfied:

0.20<

(CT4+CT5+CT6)/CT3<

1.50.

6. The optical imaging lens assembly of claim 1, wherein the central thickness of the third lens element is CT3, a sum of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is Σ

CT, and the following condition is satisfied;

1.50<

Σ

CT/CT3<

3.50.

7. The optical imaging lens assembly of claim 1, wherein the central thickness of the third lens element is CT3, the central thickness of the sixth lens element is CT6, and the following condition is satisfied:

0.05<

CT6/CT3<

0.55.

8. The optical imaging lens assembly of claim 1, wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, and a minimum value among absolute values of f1, f2, f3, f4, f5, f6, and f7 is the absolute value of f5.

9. The optical imaging lens assembly of claim 1, wherein a curvature radius of an object-side surface of the fifth lens element is R9, a curvature radius of an image-side surface of the fifth lens element is R10, and the following condition is satisfied:

−

2.40<

(R9+R10)/(R9−

R10)<

2.40.

10. The optical imaging lens assembly of claim 1, wherein a curvature radius of an image-side surface of the fifth lens element is R10, a curvature radius of an object-side surface of the sixth lens element is R11, and the following condition is satisfied:

|r10/R11|<

0.85.

11. The optical imaging lens assembly of claim 1, wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, and the following condition is satisfied:

(|f1|+|f2|+|f3|+|f4|+|f5|)/(|f6|+|f7|)<

1.65.

12. The optical imaging lens assembly of claim 1, further comprising:

an aperture stop, wherein an axial distance between the aperture stop and the image-side surface of the seventh lens element is SD, an axial distance between an object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, a vertical distance between at least one critical point in an off-axial region on the object-side surface or the image-side surface of the seventh lens element and an optical axis is Yc7x, the focal length of the optical imaging lens assembly is f, and the following conditions are satisfied;

0.10<

SD/TD<

0.52; and

0.10<

Yc7x/f<

2.0.

13. The optical imaging lens assembly of claim 1, wherein a vertical distance between a maximum effective radius position of an object-side surface of the first lens element and an optical axis is Y11, a vertical distance between a maximum effective radius position of the image-side surface of the seventh lens element and the optical axis is Y72, and the following condition is satisfied:

1.0<

Y11/Y72<

1.75.

14. The optical imaging lens assembly of claim 1, wherein an Abbe number of the third lens element is V3, an Abbe number of the seventh lens element is V7, and the following condition is satisfied:

(V3+V7)/2<

45.0.

15. The optical imaging lens assembly of claim 1, wherein the object-side surface of the seventh lens element is convex in a paraxial region thereof, and the object-side surface of the seventh lens element comprises at least one concave shape in an off-axial region thereof.

16. The optical imaging lens assembly of claim 1, wherein there is an air gap between every two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element that are adjacent to each other, a half of a maximum field of view of the optical imaging lens assembly is HFOV, and the following condition is satisfied:

|1/tan(HFOV)|<

0.85.

17. An image capturing apparatus, comprising:

the optical imaging lens assembly of claim 1; and

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

18. An electronic device, comprising:

the image capturing apparatus of claim 17.

19. An optical imaging lens assembly comprising, in order from an object side to an image side:

a first lens element having negative refractive power;

a second lens element having negative refractive power;

a third lens element having positive refractive power;

a fourth lens element having positive refractive power;

a fifth lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof;

a sixth lens element; and

a seventh lens element having an object-side surface and an image-side surface being both aspheric, wherein at least one of the object-side surface and the image-side surface of the seventh lens element comprises at least one inflection point;

wherein the optical imaging lens assembly has a total of seven lens elements, a focal length of the optical imaging lens assembly is f, an axial distance between the sixth lens element and the seventh lens element is T67, a curvature radius of an object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, and the following conditions are satisfied;

0<

f/T67<

9.0; and

−

0.20<

(R9+R10)/(R9−

R10)<

2.40.

20. The optical imaging lens assembly of claim 19, wherein the object-side surface of the seventh lens element is convex in a paraxial region thereof.

21. The optical imaging lens assembly of claim 19, wherein the image-side surface of the seventh lens element is concave in a paraxial region thereof.

22. The optical imaging lens assembly of claim 19, wherein a vertical distance between at least one critical point in an off-axial region on the object-side surface or the image-side surface of the seventh lens element and an optical axis is Yc7x, the focal length of the optical imaging lens assembly is f, and the following condition is satisfied:

0.10<

Yc7x/f<

2.0.

23. The optical imaging lens assembly of claim 19, wherein the focal length of the optical imaging lens assembly is f, the axial distance between the sixth lens element and the seventh lens element is T67, and the following condition is satisfied:

0<

f/T67<

5.0.

24. The optical imaging lens assembly of claim 19, wherein a central thickness of the third lens element is CT3, a sum of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is Σ

CT, and the following condition is satisfied;

1.50<

Σ

CT/CT3<

3.50.

25. The optical imaging lens assembly of claim 19, wherein a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, and the following condition is satisfied:

0<

CT2/CT3<

0.30.

26. The optical imaging lens assembly of claim 19, wherein a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, and the following condition is satisfied:

−

2.80<

(R5+R6)/(R5−

R6)<

0.65.

27. The optical imaging lens assembly of claim 19, wherein an axial distance between the fourth lens element and the fifth fens element is T45, an axial distance between the fifth lens element and the sixth lens element is T56, and the following condition is satisfied:

0.15<

T45/T56<

3.0.

28. The optical imaging lens assembly of claim 19, wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, and the following condition is satisfied:

(|f1|+|f2|+|f3|+|f4|+|f5|)/(|f6|+|f7|)<

1.65.

29. The optical imaging lens assembly of claim 19, further comprising:

an aperture stop, wherein an axial distance between the aperture stop and the image-side surface of the seventh lens element is SD, an axial distance between an object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, and the following condition is satisfied;

0.10<

SD/TD<

0.52.

30. The optical imaging lens assembly of claim 19, wherein a curvature radius of an image-side surface of the first lens element is R2, a curvature radius of an image-side surface of the second lens element is R4, and the following condition is satisfied:

1.65<

R2/R4<

5.0.

31. The optical imaging lens assembly of claim 19, wherein an Abbe number of the seventh lens element is V7, and the following condition is satisfied:

V7<

40.0.

32. The optical imaging lens assembly of claim 19, wherein a curvature radius of an object-side surface of the fourth lens element is R7, a curvature radius of an image-side surface of the fourth lens element is R8, and the following condition is satisfied:

−

0.85<

(R7+R8)/(R7−

R8)<

0.85.