Image capturing lens assembly, imaging apparatus and electronic device

• US 10,564,402 B2
• Filed: 02/06/2019
• Issued: 02/18/2020
• 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:
  US16/268,820
• Publication Number:
  US 20190187437A1
• Time in Patent Office: 377 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 in order from an object side to an image side:

a first lens element having an image-side surface being concave in a paraxial region thereof;

a second lens element;

a third lens element;

a fourth lens element having an image-side surface being convex in a paraxial region thereof;

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

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

wherein the image capturing lens assembly has a total of six lens elements, a focal length of the first lens element and a focal length of the second lens element have opposite signs, a focal length of the third lens element and a focal length of the fourth lens element have opposite signs, 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 an f-number of the image capturing lens assembly is Fno, and the following condition is satisfied:

1.2<

Fno<

2.3.

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

4. The image capturing lens assembly of claim 1, wherein the focal length of the first lens element and the focal length of the third lens element have the same sign.

5. The image capturing lens assembly of claim 1, wherein the fourth lens element has an object-side surface being concave in a paraxial region thereof.

6. 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.

7. The image capturing lens assembly of claim 1, wherein an axial distance between an 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:

0.80<

TL/ImgH<

1.80.

8. 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 all axial distances between adjacent lens elements of the image capturing lens assembly is Σ

AT, and the following condition is satisfied;

2.25<

Σ

CT/Σ

AT<

4.00.

9. 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:

0.6<

T12/CT2<

2.5.

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

f5<

f1.

11. The image capturing lens assembly of claim 1, wherein the focal length of the second lens element is f2, the focal length of the fourth lens element is f4, and the following condition is satisfied:

0<

f4/f2<

1.0.

12. 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, and the following condition is satisfied:

CT3/CT4<

1.75.

13. 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 fifth lens element is f5, a focal length of the sixth lens element is f6, and the following condition is satisfied:

2.5<

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

7.0.

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

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

16. 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:

0.2<

(R9+R10)/(R9−

R10)<

1.0.

17. The image capturing lens assembly of claim 1, wherein the sixth lens element has the object-side surface being concave in a paraxial region thereof.

18. The image capturing lens assembly of claim 1, wherein the sixth lens element has the object-side surface being convex in a paraxial region thereof.

19. 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.

20. An electronic device, comprising the imaging apparatus of claim 19.