OPTICAL IMAGING LENS ASSEMBLY, IMAGE CAPTURING UNIT AND ELECTRONIC DEVICE

• US 20180356614A1
• Filed: 07/18/2017
• Published: 12/13/2018
• Est. Priority Date: 06/09/2017
• Status: Abandoned Application

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: HSUEH, Chun-Che, KUO, Tzu-Chieh
• Application Number:
  US15/653,204
• Publication Number:
  US 20180356614A1
• Time in Patent Office: Days
• CPC Class Codes: G02B 1/007 made of negative effective refractive index materials
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: G02B 13/001 Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras G02B23/243 takes precedence
• CPC Class Codes: G02B 13/0045 having five or more lenses
• 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

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 and a sixth lens element. The second lens element has positive refractive power. The third lens element has negative refractive power. The fifth lens element has positive refractive power. The sixth lens element has negative refractive power. At least one surface among object-side surfaces and image-side surfaces of the six lens elements of the optical imaging lens assembly has at least one critical point in an off-axial region thereof and is aspheric.

Claims

1. An optical imaging 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 having positive refractive power;

a third lens element having negative refractive power;

a fourth lens element;

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

a sixth lens element having negative refractive power;

wherein at least one surface among object-side surfaces and image-side surfaces of the six lens elements has at least one critical point in an off-axial region thereof and is aspheric, an Abbe number of the sixth lens element is V6, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the fifth lens element and the sixth lens element is T56, an axial distance between an object-side surface of the first lens element and an image-side surface of the sixth lens element is TD, an entrance pupil diameter of the optical imaging lens assembly is EPD, and the following conditions are satisfied;

V6<

41;

1.5<

(T34+T45)/(T12+T23+T56)<

50; and

0.8<

TD/EPD<

2.5.

2. The optical imaging lens assembly of claim 1, wherein the axial distance between the first lens element and the second lens element is T12, the axial distance between the second lens element and the third lens element is T23, the axial distance between the third lens element and the fourth lens element is T34, the axial distance between the fourth lens element and the fifth lens element is T45, the axial distance between the fifth lens element and the sixth lens element is T56, and the following condition is satisfied:

2.3<

(T34+T45)/(T12+T23+T56)<

30.

3. The optical imaging lens assembly of claim 1, wherein the axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is TD, the entrance pupil diameter of the optical imaging lens assembly is EPD, and the following condition is satisfied:

1.0<

TD/EPD<

2.1.

4. The optical imaging lens assembly of claim 1, wherein an Abbe number of the fourth lens element is V4, the Abbe number of the sixth lens element is V6, and the following condition is satisfied:

1.2<

(V4+V6)/(V4-V6)<

22.

5. The optical imaging lens assembly of claim 1, wherein an 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:

1.2<

V5/V6<

5.0.

6. The optical imaging lens assembly of claim 1, wherein the object-side surface of the first lens element is convex in a paraxial region thereof, and the object-side surface of the first lens element has at least one concave critical point in an off-axial region thereof.

7. An optical imaging 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 having positive refractive power;

a third lens element having negative refractive power;

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

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

a sixth lens element having negative refractive power;

wherein at least one surface among object-side surfaces and image-side surfaces of the six lens elements has at least one critical point in an off-axial region thereof and is aspheric, an Abbe number of the sixth lens element is V6, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the fifth lens element and the sixth lens element is T56, and the following conditions are satisfied;

V6<

41; and

2.3<

(T34+T45)/(T12+T23+T56)<

30.

8. The optical imaging lens assembly of claim 7, wherein the axial distance between the first lens element and the second lens element is T12, the axial distance between the second lens element and the third lens element is T23, the axial distance between the third lens element and the fourth lens element is T34, the axial distance between the fourth lens element and the fifth lens element is T45, the axial distance between the fifth lens element and the sixth lens element is T56, and the following condition is satisfied:

2.6<

(T34+T45)/(T12+T23+T56)<

20.

9. The optical imaging lens assembly of claim 7, wherein the first lens element has negative refractive power.

10. The optical imaging lens assembly of claim 9, 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 optical imaging lens assembly is ImgH, a maximum field of view of the optical imaging lens assembly is FOV, and the following conditions are satisfied:

0.80<

TL/ImgH<

1.75; and

85[deg.]<

FOV<

150[deg.].

11. The optical imaging lens assembly of claim 9, wherein a composite focal length of the first lens element, the second lens element and the third lens element is f123, a composite focal length of the fourth lens element, the fifth lens element and the sixth lens element is f456, and the following condition is satisfied:

1.10<

f123/f456.

12. The optical imaging lens assembly of claim 7, wherein an axial distance between an object-side surface of the first lens element and an image-side surface of the sixth lens element is TD, an entrance pupil diameter of the optical imaging lens assembly is EPD, an f-number of the optical imaging lens assembly is Fno, and the following conditions are satisfied:

0.8<

TD/EPD<

2.5; and

1.00<

Fno<

1.90.

13. The optical imaging lens assembly of claim 7, wherein an Abbe number of the fourth lens element is V4, the Abbe number of the sixth lens element is V6, and the following condition is satisfied:

1.2<

(V4+V6)/(V4-V6)<

22.

14. The optical imaging lens assembly of claim 7, wherein an 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:

1.2<

V5/V6<

5.0.

15. The optical imaging lens assembly of claim 7, wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, the axial distance between the first lens element and the second lens element is T12, and the following condition is satisfied:

(CT1+T12)/CT2<

1.0.

16. The optical imaging lens assembly of claim 7, wherein a central thickness of the fifth lens element is CT5, a central thickness of the sixth lens element is CT6, and the following condition is satisfied:

1.1<

CT5/CT6<

2.0.

17. The optical imaging lens assembly of claim 7, wherein a curvature radius of an object-side surface of the first lens element is R1, a focal length of the optical imaging lens assembly is f, and the following condition is satisfied:

0.60<

|R1|/f.

18. The optical imaging lens assembly of claim 7, wherein a focal length of the optical imaging lens assembly is f, a focal length of the first lens element is f1, and the following condition is satisfied:

−

0.60<

f/f1<

0.50.

19. The optical imaging lens assembly of claim 7, wherein the first lens element has an object-side surface being convex in a paraxial region thereof, and the object-side surface of the first lens element has at least one concave critical point in an off-axial region thereof.

20. The optical imaging lens assembly of claim 7, wherein the second lens element has an object-side surface being convex in a paraxial region thereof, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of an image-side surface of the second lens element is R4, and the following condition is satisfied:

|R3/R4|<

4.0.

21. An optical imaging 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 having negative refractive power;

a second lens element having positive refractive power;

a third lens element having negative refractive power;

a fourth lens element;

a fifth lens element having positive refractive power; and

a sixth lens element having negative refractive power;

wherein at least one surface among object-side surfaces and image-side surfaces of the six lens elements has at least one critical point in an off-axial region thereof and is aspheric, an Abbe number of the sixth lens element is V6, an axial distance between an object-side surface of the first lens element and an image-side surface of the sixth lens element is TD, an entrance pupil diameter of the optical imaging lens assembly is EPD, and the following conditions are satisfied;

V6<

41; and

0.8<

TD/EPD<

2.5.

22. The optical imaging lens assembly of claim 21, wherein the axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is TD, the entrance pupil diameter of the optical imaging lens assembly is EPD, and the following condition is satisfied:

1.0<

TD/EPD<

2.1.

23. The optical imaging lens assembly of claim 21, wherein an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the fifth lens element and the sixth lens element is T56, and the following condition is satisfied:

2.3<

(T34+T45)/(T12+T23+T56)<

30.

24. The optical imaging lens assembly of claim 21, wherein an Abbe number of the fourth lens element is V4, the Abbe number of the sixth lens element is V6, and the following condition is satisfied:

1.2<

(V4+V6)/(V4-V6)<

22.

25. The optical imaging lens assembly of claim 21, wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, an axial distance between the first lens element and the second lens element is T12, and the following condition is satisfied:

(CT1+T12)/CT2<

1.0.

26. The optical imaging lens assembly of claim 21, wherein a central thickness of the fifth lens element is CT5, a central thickness of the sixth lens element is CT6, and the following condition is satisfied:

1.1<

CT5/CT6<

2.0.

27. The optical imaging lens assembly of claim 21, wherein a curvature radius of the object-side surface of the first lens element is R1, a focal length of the optical imaging lens assembly is f, and the following condition is satisfied:

0.60<

|R1|/f.

28. The optical imaging lens assembly of claim 21, wherein a composite focal length of the first lens element, the second lens element and the third lens element is f123, a composite focal length of the fourth lens element, the fifth lens element and the sixth lens element is f456, and the following condition is satisfied:

1.10<

f123/f456.

29. The optical imaging lens assembly of claim 21, wherein at least three of the six lens elements of the optical imaging lens assembly each have at least one critical point in an off-axial region thereof, a focal length of the optical imaging lens assembly is f, a maximum image height of the optical imaging lens assembly is ImgH, an f-number of the optical imaging lens assembly is Fno, an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:

0.55<

f/ImgH<

1.1;

1.00<

Fno<

1.90; and

0.80<

TL/ImgH<

1.75.

30. The optical imaging lens assembly of claim 21, wherein the image-side surface of the sixth lens element is concave in a paraxial region thereof, the image-side surface of the sixth lens element has at least one convex critical point in an off-axial region thereof, a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of the image-side surface of the sixth lens element is Y62, a curvature radius of the image-side surface of the sixth lens element is R12, and the following conditions are satisfied:

1.5<

Y62/R12<

6.0; and

1.6<

Y62/Y11<

2.4.

31. The optical imaging lens assembly of claim 21, wherein the object-side surface of the first lens element is convex in a paraxial region thereof, and the object-side surface of the first lens element has at least one concave critical point in an off-axial region thereof.

32. The optical imaging lens assembly of claim 21, wherein the third lens element has an image-side surface being concave in a paraxial region thereof, and the fourth lens element has an image-side surface being concave in a paraxial region thereof.

33. An image capturing unit, comprising:

the optical imaging lens assembly of claim 21; and

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

34. An electronic device, comprising:

the image capturing unit of claim 33.