PHOTOGRAPHING OPTICAL LENS ASSEMBLY, IMAGE CAPTURING DEVICE AND ELECTRONIC DEVICE

• US 20160187622A1
• Filed: 04/13/2015
• Published: 06/30/2016
• Est. Priority Date: 12/30/2014
• Status: Active Grant

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: Huang, Hsin-Hsuan
• Granted Patent: US 9,726,858 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 13/0015 characterised by the lens design
• 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
• CPC Class Codes: G02B 9/62 having six components only

Abstract

A photographing optical 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 first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power. Each of the third through sixth lens elements has refractive power and an object-side surface and an image-side surface being both aspheric. The photographing optical lens assembly has a total of six lens elements with refractive power.

Claims

1. A photographing optical lens assembly comprising, 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 in a paraxial region thereof;

a second lens element having refractive power;

a third lens element with refractive power having an object-side surface and an image-side surface being both aspheric;

a fourth lens element with refractive power having an object-side surface and an image-side surface being both aspheric;

a fifth lens element with refractive power having an object-side surface and an image-side surface being both aspheric; and

a sixth lens element with refractive power having an object-side surface and an image-side surface being both aspheric;

wherein the photographing optical lens assembly has a total of six lens elements with refractive power, and there is no relative displacement among the lens elements with refractive power, a focal length of the photographing optical lens assembly is f, an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is TD, an axial distance between the image-side surface of the sixth lens element and an image surface is BL, a maximum image height of the photographing optical lens assembly is ImgH, and the following conditions are satisfied;

0.30<

TD/f<

0.90;

0<

BL/f<

0.25; and

2.0<

f/ImgH<

5.0.

2. The photographing optical lens assembly of claim 1, wherein the sixth lens element has negative refractive power.

3. The photographing optical lens assembly of claim 1, wherein the second lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof, a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, a refractive index of the fourth lens element is N4, a refractive index of the fifth lens element is N5, a refractive index of the sixth lens element is N6, a maximum of N1, N2, N3, N4, N5 and N6 is Nmax, and the following condition is satisfied:

Nmax<

1.70.

4. The photographing optical lens assembly of claim 1, wherein the focal length of the photographing optical lens assembly is f, the maximum image height of the photographing optical lens assembly is ImgH, and the following condition is satisfied:

2.35<

f/ImgH<

4.5.

5. The photographing optical lens assembly of claim 1, wherein the image-side surface of the third lens element is concave in a paraxial region thereof.

6. The photographing optical lens assembly of claim 1, wherein an Abbe number of the fifth lens element is V5, and the following condition is satisfied:

V5<

30.

7. The photographing optical lens assembly of claim 1, further comprising:

a stop, wherein an axial distance between the stop and the image-side surface of the sixth lens element is SD, 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, and the following condition is satisfied;

0.75<

SD/TD<

1.0.

8. The photographing optical lens assembly of claim 1, wherein a distance in parallel with an optical axis from an axial vertex on the image-side surface of the sixth lens element to a maximum effective radius position on the image-side surface of the sixth lens element is SAG62, a central thickness of the sixth lens element is CT6, and the following condition is satisfied:

SAG62+CT6<

0 mm.

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

1.0<

(R10+R11)/(R10−

R11)<

8.0.

10. The photographing optical lens assembly of claim 1, wherein the focal length of the photographing optical lens assembly is f, 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 sixth lens element is f6, and the following condition is satisfied:

5.0<

|f/f1|=|f/f2|+f/f6|.

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

12. An image capturing device, comprising:

the photographing optical lens assembly of claim 1; and

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

13. An electronic device, comprising:

the image capturing device of claim 12.

14. A photographing optical lens assembly comprising, 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 in a paraxial region thereof;

a second lens element having refractive power;

a third lens element with refractive power having an object-side surface and an image-side surface being both aspheric;

a fourth lens element with refractive power having an object-side surface and an image-side surface being both aspheric;

a fifth lens element with refractive power having an object-side surface and an image-side surface being both aspheric; and

a sixth lens element with refractive power having an object-side surface and an image-side surface being both aspheric;

wherein the photographing optical lens assembly has a total of six lens elements with refractive power, there is an air space between any two lens elements 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 that are adjacent to each other, and there is no relative displacement among the lens elements with refractive power, the photographing optical lens assembly further comprises a stop, there is no lens element with refractive power between the stop and the first lens element, a focal length of the photographing optical lens assembly is f, an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is TD, a maximum image height of the photographing optical lens assembly is ImgH, and the following conditions are satisfied;

0.30<

TD/f<

0.90; and

2.0<

f/ImgH<

5.0.

15. The photographing optical lens assembly of claim 14, wherein the second lens element has negative refractive power.

16. The photographing optical lens assembly of claim 14, wherein the fifth lens element has positive refractive power, and the sixth lens element has negative refractive power.

17. The photographing optical lens assembly of claim 14, wherein a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, a refractive index of the fourth lens element is N4, a refractive index of the fifth lens element is N5, a refractive index of the sixth lens element is N6, a maximum of N1, N2, N3, N4, N5 and N6 is Nmax, and the following condition is satisfied:

Nmax<

1.70.

18. The photographing optical lens assembly of claim 14, wherein the focal length of the photographing optical lens assembly is f, 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, and the following condition is satisfied:

0.50<

TD/f<

0.85.

19. The photographing optical lens assembly of claim 14, wherein an entrance pupil diameter of the photographing optical lens assembly is EPD, the maximum image height of the photographing optical lens assembly is ImgH, and the following condition is satisfied:

0.8<

EPD/ImgH<

2.0.

20. The photographing optical lens assembly of claim 14, wherein half of a maximal field of view of the photographing optical lens assembly is HFOV, and the following condition is satisfied:

7.5 degrees<

HFOV<

23.5 degrees.

21. The photographing optical lens assembly of claim 14, wherein at least two lens elements among the first lens element, the second lens element and the third 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.

22. The photographing optical lens assembly of claim 14, wherein a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, and the following condition is satisfied:

−

0.3<

(R7−

R8)/(R7+R8)<

0.6.

23. The photographing optical lens assembly of claim 14, wherein an axial distance between the stop and the object-side surface of the first lens element is Dsr1, an axial distance between the stop and an image-side surface of the first lens element is Dsr2, and the following condition is satisfied:

1.40<

|Dsr1/Dsr2|.

24. An image capturing device, comprising:

the photographing optical lens assembly of claim 14;

a prism disposed on an optical path between an imaged object and the photographing optical lens assembly; and

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

25. A photographing optical lens assembly comprising, 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 in a paraxial region thereof;

a second lens element having negative refractive power;

a third lens element with refractive power having an object-side surface and an image-side surface being both aspheric;

a fourth lens element with refractive power having an object-side surface and an image-side surface being both aspheric;

a fifth lens element with refractive power having an object-side surface and an image-side surface being both aspheric; and

a sixth lens element with refractive power having an object-side surface and an image-side surface being both aspheric;

wherein the photographing optical lens assembly has a total of six lens elements with refractive power, and there is no relative displacement among the lens elements with refractive power, a focal length of the photographing optical lens assembly is f, an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is TD, an axial distance between the image-side surface of the sixth lens element and an image surface is BL, and the following conditions are satisfied;

0.30<

TD/f<

0.85; and

0<

BL/f<

0.25.

26. The photographing optical lens assembly of claim 25, wherein the image-side surface of the fifth lens element is convex in a paraxial region thereof, and the object-side surface of the sixth lens element is concave in a paraxial region thereof.

27. The photographing optical lens assembly of claim 25, wherein the object-side surface of the fifth lens element is concave in a paraxial region thereof, and the image-side surface of the sixth lens element is convex in a paraxial region thereof.

28. The photographing optical lens assembly of claim 25, wherein the third lens element has negative refractive power, the first lens element has an image-side surface being convex in a paraxial region thereof and comprises at least one concave shape in an off-axial region thereof.

29. The photographing optical lens assembly of claim 25, wherein 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 are made of plastic material, an axial distance between the object-side surface of the first lens element and the image surface is TL, a maximum image height of the photographing optical lens assembly is ImgH, and the following condition is satisfied:

2.0<

TL/ImgH<

3.0.

30. The photographing optical lens assembly of claim 25, 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, an axial distance between the image-side surface of the third lens element and the object-side surface of the fifth lens element is Dr6r9, and the following condition is satisfied:

TD/Dr6r9<

3.1.

31. The photographing optical lens assembly of claim 25, wherein each of the fourth lens element, the fifth lens element and the sixth lens element has a surface being concave in a paraxial region thereof and the other surface being convex in a paraxial region thereof.

32. The photographing optical lens assembly of claim 25, 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:

(R11+R12)/(R11−

R12)<

−

1.0.

33. The photographing optical lens assembly of claim 25, wherein the focal length of the photographing optical lens assembly is f, 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 sixth lens element is f6, and the following condition is satisfied:

5.0<

|f/f1|+|f/f2|+|f/f6|.

34. The photographing optical lens assembly of claim 25, wherein a sum of axial distances between each two lens elements 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 which are adjacent to each other is Σ

AT, 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, and the following condition is satisfied;

0.40<

Σ

AT/TD.

35. The photographing optical lens assembly of claim 25, wherein the focal length of the photographing optical lens assembly is f, 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 sixth lens element is R12, and the following condition is satisfied:

4.0<

f/R1−

f/R12<

8.5.