IMAGE CAPTURING LENS ASSEMBLY, IMAGING APPARATUS AND ELECTRONIC DEVICE

• US 20190285858A1
• Filed: 05/31/2019
• Published: 09/19/2019
• Est. Priority Date: 05/20/2016
• Status: Active Grant

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: HSU, PO-LUN, Huang, Hsin-Hsuan
• Granted Patent: US 10,606,040 B2
• 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 27/0025 for optical correction, e.g. distorsion, aberration
• CPC Class Codes: G02B 9/62 having six components only

Abstract

An image capturing 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 having positive refractive power; a fifth lens element having both an object-side surface and an image-side surface being aspheric; and a sixth lens element having both an object-side surface and an image-side surface being aspheric, the image-side surface being concave, and at least one inflection point on the image-side surface. There are a total of six lens elements.

Claims

1. An image capturing lens assembly comprising six lens elements, the six lens elements being, 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 and a sixth lens element;

each of the six lens elements comprising an object-side surface facing toward the object side and an image-side surface facing toward the image side;

wherein the object-side surface of the second lens element is convex in a paraxial region thereof, the object-side surface of the third lens element is convex in a paraxial region thereof, the image-side surface of the sixth lens element is aspheric and concave in a paraxial region thereof, and the image-side surface of the sixth lens element has at least one inflection point thereon;

wherein the image capturing lens assembly has a total of six lens elements;

a maximum refractive index among the six lens elements is Nmax, a half of a maximal field of view of the image capturing lens assembly is HFOV, an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the image capturing lens assembly is f, and the following conditions are satisfied;

1.660≤

Nmax<

1.72;

0<

1/tan(HFOV)<

0.70; and

1.50<

TL/f<

5.0.

2. The image capturing lens assembly of claim 1, wherein the first lens element has negative refractive power and the image-side surface of the first lens element is concave in a paraxial region thereof.

3. The image capturing lens assembly of claim 1, wherein the object-side surface of the fifth lens element is convex in a paraxial region thereof.

4. The image capturing lens assembly of claim 1, wherein the focal length of the image capturing lens assembly is f, an entrance pupil diameter of the image capturing lens assembly is EPD, and the following condition is satisfied:

1.25<

f/EPD<

2.30.

5. The image capturing lens assembly of claim 4, wherein the third lens element has positive refractive power and the image-side surface of the second lens element is concave in a paraxial region thereof.

6. The image capturing lens assembly of claim 1, wherein the focal length of the image capturing lens assembly is f, a focal length of the fourth lens element is f4, a focal length of the i-th lens element is fi, and the following condition is satisfied:

|f/fi|<

|f/f4|,i=1,2,3,5,6.

7. The image capturing lens assembly of claim 1, wherein an Abbe number of the first lens element is V1, an Abbe number of the third lens element is V3, an Abbe number of the fifth lens element is V5, and the following condition is satisfied:

0.3<

(V3+V5)/V1<

1.0.

8. The image capturing lens assembly of claim 1, wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, a maximum image height of the image capturing lens assembly is ImgH, and the following condition is satisfied:

TL/ImgH<

1.80.

9. The image capturing lens assembly of claim 1, further comprising an aperture stop and wherein a maximum image height of the image capturing lens assembly is ImgH, a curvature radius of the image-side surface of the sixth lens element is R12, an angle between a chief ray of the maximum image height and an optical axis at the aperture stop is θ

stop, and the following conditions are satisfied;

1.0<

ImgH/R12<

8.0; and

55 degrees<

θ

stop<

80 degrees.

10. The image capturing lens assembly of claim 1, wherein a central thickness of the second lens element is larger than a central thickness of the third lens element.

11. An imaging apparatus, comprising the image capturing lens assembly of claim 1 and an image sensor disposed on the image surface of the image capturing lens assembly.

12. An electronic device, comprising the imaging apparatus of claim 11.

13. An image capturing lens assembly comprising six lens elements, the six lens elements being, 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 and a sixth lens element;

each of the six lens elements comprising an object-side surface facing toward the object side and an image-side surface facing toward the image side;

wherein the second lens element has positive refractive power, the image-side surface of the sixth lens element is aspheric and concave in a paraxial region thereof, and the image-side surface of the sixth lens element has at least one inflection point thereon;

wherein the image capturing lens assembly has a total of six lens elements;

a maximum refractive index among the six lens elements is Nmax, a half of a maximal field of view of the image capturing lens assembly is HFOV, an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the image capturing lens assembly is f, and the following conditions are satisfied;

1.660≤

Nmax<

1.72;

0<

1/tan(HFOV)<

0.70; and

1.70<

TL/f<

4.0.

14. The image capturing lens assembly of claim 13, wherein the first lens element has negative refractive power and the image-side surface of the first lens element is concave in a paraxial region thereof.

15. The image capturing lens assembly of claim 13, wherein the third lens element has negative refractive power and the image-side surface of the third lens element is concave in a paraxial region thereof.

16. The image capturing lens assembly of claim 13, wherein the fourth lens element has positive refractive power and the image-side surface of the fourth lens element is convex in a paraxial region thereof.

17. The image capturing lens assembly of claim 13, wherein the object-side surface of the fourth lens element is convex in a paraxial region thereof.

18. The image capturing lens assembly of claim 13, wherein the object-side surface of the fifth lens element is convex in a paraxial region thereof.

19. The image capturing lens assembly of claim 13, wherein the focal length of the image capturing lens assembly is f, an entrance pupil diameter of the image capturing lens assembly is EPD, a vertical distance between an off-axial critical point on the image-side surface of the sixth lens element and an optical axis is Yc62, and the following conditions are satisfied:

1.25<

f/EPD<

2.30; and

0.3<

Yc62/f<

1.2.

20. The image capturing lens assembly of claim 19, wherein the object-side surface of the second lens element is convex in a paraxial region thereof, the object-side surface of the sixth lens element is convex in a paraxial region thereof, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, and the following condition is satisfied:

|R2/R1|<

1.70.

21. The image capturing lens assembly of claim 19, wherein a central thickness of the first lens element is larger than an axial distance between the fifth lens element and the sixth lens element, the focal length of the image capturing lens assembly is f, a focal length of the second lens element is f2, a focal length of the fourth lens element is f4, and the following condition is satisfied:

|f/f2|<

|f/f4|.

22. The image capturing lens assembly of claim 13, wherein a curvature radius of the object-side surface of the sixth lens element is R11, a curvature radius of the image-side surface of the sixth lens element is R12, and the following condition is satisfied:

−

0.10<

(R11−

R12)/(R11+R12)<

0.35.

23. The image capturing lens assembly of claim 13, wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, a maximum image height of the image capturing lens assembly is ImgH, the half of the maximal field of view of the image capturing lens assembly is HFOV, and the following condition is satisfied:

0.20<

TL/(ImgH*tan(HFOV))<

1.35.

24. The image capturing lens assembly of claim 13, wherein a central thickness of the fourth lens element is the largest among the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, and the sixth lens element.

25. An image capturing lens assembly comprising six lens elements, the six lens elements being, 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 and a sixth lens element;

each of the six lens elements comprising an object-side surface facing toward the object side and an image-side surface facing toward the image side;

wherein the object-side surface of the first lens element is concave in a paraxial region thereof, the image-side surface of the sixth lens element is aspheric and concave in a paraxial region thereof, and the image-side surface of the sixth lens element has at least one inflection point thereon;

wherein the image capturing lens assembly has a total of six lens elements;

a maximum refractive index among the six lens elements is Nmax, a half of a maximal field of view of the image capturing lens assembly is HFOV, and the following conditions are satisfied;

1.660≤

Nmax<

1.72; and

0<

1/tan(HFOV)<

0.70.

26. The image capturing lens assembly of claim 25, wherein the third lens element has negative refractive power and the images-side surface of the third lens element is concave in a paraxial region thereof.

27. The image capturing lens assembly of claim 25, wherein the image-side surface of the first lens element is concave in a paraxial region thereof, a focal length of the image capturing lens assembly is f, a focal length of the second lens element is f2, and the following condition is satisfied:

0.15<

f/f2<

1.80.

28. The image capturing lens assembly of claim 25, wherein the object-side surface of the sixth lens element is convex in a paraxial region thereof, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the image capturing lens assembly is ImgH, and the following condition is satisfied:

TL/ImgH<

1.80.

29. The image capturing lens assembly of claim 25, wherein a focal length of the image capturing lens assembly is f, an entrance pupil diameter of the image capturing lens assembly is EPD, and the following condition is satisfied:

1.25<

f/EPD<

2.30.

30. The image capturing lens assembly of claim 29, wherein the object-side surface of the third lens element is convex in a paraxial region thereof, the maximal field of view of the image capturing lens assembly is FOV, and the following condition is satisfied:

110 degrees<

FOV<

150 degrees.

31. The image capturing lens assembly of claim 25, wherein the object-side surface of the fifth lens element is convex in a paraxial region thereof.

32. The image capturing lens assembly of claim 25, wherein the image-side surface of the fifth lens element is concave in a paraxial region thereof, an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the image capturing lens assembly is f, and the following condition is satisfied:

1.50<

TL/f<

5.0.

33. The image capturing lens assembly of claim 25, wherein a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, and the following condition is satisfied:

0.19≤

|R2/R1|≤

0.56.

34. An image capturing lens assembly comprising six lens elements, the six lens elements being, 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 and a sixth lens element;

each of the six lens elements comprising an object-side surface facing toward the object side and an image-side surface facing toward the image side;

wherein the image-side surface of the fifth lens element is concave in a paraxial region thereof, the image-side surface of the sixth lens element is aspheric and concave in a paraxial region thereof, and the image-side surface of the sixth lens element has at least one inflection point thereon;

wherein the image capturing lens assembly has a total of six lens elements;

a maximum refractive index among the six lens elements is Nmax, a half of a maximal field of view of the image capturing lens assembly is HFOV, an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the image capturing lens assembly is f, and the following conditions are satisfied;

1.660≤

Nmax<

1.72;

0<

1/tan(HFOV)<

0.70; and

1.50<

TL/f<

5.0.

35. The image capturing lens assembly of claim 34, wherein the fifth lens element has negative refractive power.

36. The image capturing lens assembly of claim 34, wherein the object-side surface of the fifth lens element is convex in a paraxial region thereof.

37. The image capturing lens assembly of claim 34, wherein the object-side surface of the sixth lens element is convex in a paraxial region thereof, the axial distance between the object-side surface of the first lens element and the image surface is TL, a maximum image height of the image capturing lens assembly is ImgH, and the following condition is satisfied:

TL/ImgH<

1.80.

38. The image capturing lens assembly of claim 34, wherein a maximum image height of the image capturing lens assembly is ImgH, a curvature radius of the image-side surface of the sixth lens element is R12, the focal length of the image capturing lens assembly is f, an entrance pupil diameter of the image capturing lens assembly is EPD, and the following conditions are satisfied:

1.0<

ImgH/R12<

8.0; and

1.25<

f/EPD<

2.30.

39. The image capturing lens assembly of claim 34, wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, a maximum image height of the image capturing lens assembly is ImgH, the half of the maximal field of view of the image capturing lens assembly is HFOV, and the following condition is satisfied:

0.20<

TL/(ImgH*tan(HFOV))<

1.50.