Image capturing lens assembly, imaging apparatus and electronic device

• US 10,241,305 B2
• Filed: 08/22/2017
• Issued: 03/26/2019
• Est. Priority Date: 01/18/2017
• Status: Active Grant

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: Hsueh, Chun-Che, Chen, Wei-Yu
• Primary Examiner(s): Pasko, Nicholas R.
• Application Number:
  US15/682,654
• Publication Number:
  US 20180203208A1
• Time in Patent Office: 581 Days
• Field of Search: 359713
• 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 13/18 with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration G02B13/002 takes precedence
• CPC Class Codes: G02B 3/04 with continuous faces that are rotationally symmetrical but deviate from a true sphere , e.g. so called "aspheric" lenses
• CPC Class Codes: G02B 9/62 having six components only

Abstract

A image capturing lens assembly includes six lens elements, the six lens elements being, in order from an object side to an image side: a first lens element with positive refractive power having an object-side surface being convex thereof; a second lens element having negative refractive power; a third lens element; a fourth lens element; a fifth lens element with positive refractive power having an object-side surface being convex and an image-side surface being convex thereof; and a sixth lens element having an image-side surface being concave in a paraxial region thereof, the image-side surface having at least one convex critical point in an off-axial region thereof, and an object-side surface and the image-side surface being aspheric.

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 with positive refractive power having an object-side surface being convex thereof;

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

a third lens element;

a fourth lens element having negative refractive power;

a fifth lens element with positive refractive power having an object-side surface being convex and an image-side surface being convex thereof; and

a sixth lens element having an image-side surface being concave in a paraxial region thereof, the image-side surface having at least one convex critical point in an off-axial region thereof, and an object-side surface and the image-side surface being aspheric,

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, and the following condition is satisfied;

V4+V5+V6<

100.

2. The image capturing lens assembly of claim 1, wherein the Abbe number of the fourth lens element is V4, the Abbe number of the fifth lens element is V5, the Abbe number of the sixth lens element is V6, and the following condition is satisfied:

40<

V4+V5+V6<

85.

3. The image capturing lens assembly of claim 2, wherein the third lens element has positive refractive power.

4. The image capturing lens assembly of claim 2, wherein 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, an f-number of the image capturing lens assembly is Fno, and the following conditions are satisfied:

0.80<

TL/ImgH<

1.80;

1.20<

Fno<

2.30.

5. The image capturing lens assembly of claim 1, wherein 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, and the sixth lens element is Σ

CT, a sum of axial distances between every two adjacent lens elements of the image capturing lens assembly is Σ

AT, and the following condition is satisfied;

2.25<

Σ

CT/Σ

AT<

4.0.

6. The image capturing lens assembly of claim 1, wherein a curvature radius of the 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 condition is satisfied:

0.20<

(R9+R10)/(R9−

R10)<

1.0.

7. The image capturing lens assembly of claim 1, wherein the sixth lens element has negative refractive power, 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<

(R11+R12)/(R11−

R12)<

1.5.

8. The image capturing lens assembly of claim 1, wherein an axial distance between the first lens element and the second lens element is T12, a central thickness of the second lens element is CT2, and the following condition is satisfied:

0.60<

T12/CT2<

2.5.

9. The image capturing lens assembly of claim 1, wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, the Abbe number of the fourth lens element is V4, the Abbe number of the fifth lens element is V5, the Abbe number of the sixth lens element is V6, and the following condition is satisfied:

1.0<

(V1+V3)/(V2+V4+V5+V6)<

1.75.

10. The image capturing lens assembly of claim 1, wherein a focal length of the first lens element is f1, a focal length of the third lens element is f3, a focal length of the fifth lens element is f5, and the following conditions are satisfied:

|f3|<

f1;

f5<

f1.

11. The image capturing lens assembly of claim 1, wherein a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a focal length of the image capturing lens assembly is f, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, and the following conditions are satisfied:

CT3/CT4<

1.75;

2.50<

(f/f5)+|f/f6|<

7.0.

12. The image capturing lens assembly of claim 1, wherein the second lens element has an object-side surface and the image-side surface both being aspheric, and at least one convex critical point in an off-axial region of the image-side surface thereof.

13. The image capturing lens assembly of claim 1, wherein the fifth lens element has the object-side surface and the image-side surface both being aspheric, and at least one concave critical point in an off-axial region of the object-side surface thereof.

14. The image capturing lens assembly of claim 1, wherein the third lens element has an object-side surface and an image-side surface both being aspheric, and the object-side surface being convex in a paraxial region thereof and at least one concave critical point in an off-axial region of the object-side surface thereof.

15. The image capturing lens assembly of claim 1, wherein a focal length of the image capturing lens assembly is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following condition is satisfied:

1.25<

|f/f3|+|f/f4|<

3.0.

16. The image capturing lens assembly of claim 1, wherein 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:

0<

f4/f2<

1.0.

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

18. An electronic device, comprising the imaging apparatus of claim 17.

19. An image capturing lens assembly comprising six lens elements, the six lens elements being, in order from a n object side to an image side:

a first lens element with positive refractive power having an object-side surface being convex thereof;

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

a third lens element;

a fourth lens element having negative refractive power;

a fifth lens element with positive refractive power having an image-side surface being convex thereof, and

a sixth lens element with negative refractive power having both an object-side surface and an image-side surface being aspheric, the image-side surface being concave in a paraxial region thereof and at least one convex critical point in an off-axial region of the image-side surface thereof,

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, 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, and the following conditions are satisfied;

−

1.0<

(R11+R12)/(R11−

R12)≤

1.0;

V4+V5+V6<

100.

20. The image capturing lens assembly of claim 19, wherein the Abbe number of the fourth lens element is V4, the Abbe number of the fifth lens element is V5, the Abbe number of the sixth lens element is V6, and the following condition is satisfied:

40<

V4+V5+V6<

85.

21. The image capturing lens assembly of claim 19, wherein 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, and the sixth lens element is Σ

CT, a sum of axial distances between every two adjacent lens elements of the image capturing lens assembly is Σ

AT, and the following condition is satisfied;

2.25<

Σ

CT/Σ

AT<

4.0.

22. The image capturing lens assembly of claim 19, wherein an axial distance between the first lens element and the second lens element is T12, a central thickness of the second lens element is CT2, and the following condition is satisfied:

0.60<

T12/CT2<

2.5.

23. The image capturing lens assembly of claim 19, wherein 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:

0<

f4/f2<

1.0.

24. The image capturing lens assembly of claim 19, wherein a focal length of the image capturing lens assembly is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following condition is satisfied:

1.25<

|f/f3|+|f/f4|<

3.0.

25. The image capturing lens assembly of claim 19, wherein the second lens element has an object-side surface and the image-side surface both being aspheric, and at least one convex critical point in an off-axial region of the image-side surface thereof.

26. The image capturing lens assembly of claim 19, wherein a total number of lens elements in the image capturing lens assembly having an Abbe number less than 40 is VN40, and the following condition is satisfied:

4≤

VN40.