IMAGE CAPTURING OPTICAL LENS ASSEMBLY

• US 20130321932A1
• Filed: 10/26/2012
• Published: 12/05/2013
• Est. Priority Date: 06/05/2012
• Status: Active Grant

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: HSU, Chih-Wen, TSAI, Tsung-Han, CHEN, Wei-Yu
• Granted Patent: US 8,908,288 B2
• Time in Patent Office: Days
• US Class Current: 359/714
• CPC Class Codes: G02B 13/0045 having five or more lenses

Abstract

An image capturing 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 and a fifth lens element. The first lens element has positive refractive power. The second lens element has positive refractive power. The third lens element has negative refractive power. The fourth lens element has positive refractive power. The fifth lens element with negative refractive power is made of plastic material, and has an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric.

Claims

1. An image capturing optical lens assembly comprising, in order from an object side to an image side:

a first lens element with positive refractive power;

a second lens element with positive refractive power;

a third lens element with negative refractive power;

a fourth lens element with positive refractive power; and

a fifth lens element with negative refractive power made of plastic material and having an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric;

wherein 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 fourth lens element is f4, a focal length of the image capturing optical lens assembly is f, a curvature radius of an image-side surface of the third lens element is R6, and the following relationships are satisfied;

0<

f2/f1<

0.90;

0<

f4/f1<

0.30; and

−

0.35<

f/R6≦

0.85.

2. The image capturing optical lens assembly of claim 1, wherein the fourth lens element has an image-side surface being convex at a paraxial region, and is made of plastic material, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric.

3. The image capturing optical lens assembly of claim 2, wherein the second lens element has an object-side surface being convex at a paraxial region.

4. The image capturing optical lens assembly of claim 3, wherein the third lens element has an object-side surface being concave at a paraxial region.

5. The image capturing optical lens assembly of claim 4, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the following relationship is satisfied:

0<

f2/f1<

0.50.

6. The image capturing optical lens assembly of claim 4, wherein a distance in parallel with an optical axis from a critical point on the image-side surface of the fifth lens element to an axial vertex on the image-side surface of the fifth lens element is MSAG52, a central thickness of the fifth lens element is CT5, and the following relationship is satisfied:

0.4<

MSAG52/CT5<

1.5.

7. The image capturing optical lens assembly of claim 4, wherein 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, a central thickness of the fourth lens element is CT4, and the following relationship is satisfied:

0<

(T34+T45)/CT4<

0.50.

8. The image capturing optical lens assembly of claim 4, further comprising:

a stop located between the first lens element and the second lens element.

9. The image capturing optical lens assembly of claim 5, wherein a sum of the central thickness from the first through fifth lens elements is Σ

CT, an axial distance between an object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, and the following relationship is satisfied;

0.75<

Σ

CT/Td<

0.90.

10. The image capturing optical lens assembly of claim 2, wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following relationship is satisfied:

1.5≦

V2/V1<

3.0.

11. The image capturing optical lens assembly of claim 3, further comprising:

a stop, wherein an axial distance between the stop and an image-side surface of the second lens element is Dsr4, a central thickness of the second lens element is CT2, and the following relationship is satisfied;

0.7<

Dsr4/CT2≦

1.0.

12. The image capturing optical lens assembly of claim 3, wherein the image-side surface of the third lens element is convex at a peripheral region.

13. The image capturing optical lens assembly of claim 12, wherein a curvature radius of the object-side surface of the third lens element is R5, the curvature radius of the image-side surface of the third lens element is R6, and the following relationship is satisfied:

−

2.5<

R5/R6<

0.

14. The image capturing optical lens assembly of claim 13, wherein the second lens element has an image-side surface being convex at a paraxial region.

15. An image capturing optical lens assembly comprising, in order from an object side to an image side:

a first lens element with positive refractive power;

a second lens element with positive refractive power;

a third lens element with negative refractive power;

a fourth lens element with positive refractive power; and

a fifth lens element with negative refractive power made of plastic material, and having an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric;

wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, 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, a central thickness of the fourth lens element is CT4, a focal length of the image capturing optical lens assembly is f, a curvature radius of an image-side surface of the third lens element is R6, and the following relationships are satisfied;

0<

f2/f1<

0.90;

0<

(T34+T45)/CT4<

1.0; and

−

0.35<

f/R6≦

0.85.

16. The image capturing optical lens assembly of claim 15, wherein 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 central thickness of the fourth lens element is CT4, and the following relationship is satisfied:

0<

(T34+T45)/CT4<

0.75.

17. The image capturing optical lens assembly of claim 16, wherein the focal length of the image capturing optical lens assembly is f, the curvature radius of the image-side surface of the third lens element is R6, and the following relationship is satisfied:

0<

f/R6<

0.85.

18. The image capturing optical lens assembly of claim 17, wherein the object-side surface of the fifth lens element is convex at a paraxial region.

19. The image capturing optical lens assembly of claim 17, wherein the second lens element has an object-side surface being convex at a paraxial region, and the fourth lens element has an image-side surface being convex at a paraxial region.

20. The image capturing optical lens assembly of claim 19, wherein 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 central thickness of the fourth lens element is CT4, and the following relationship is satisfied:

0<

(T34+T45)/CT4<

0.50.

21. The image capturing optical lens assembly of claim 15, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the following relationship is satisfied:

0<

f2/f1<

0.50.

22. The image capturing optical lens assembly of claim 21, wherein a sum of the central thickness from the first through fifth lens elements is Σ

CT, an axial distance between an object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, and the following relationship is satisfied;

0.75<

Σ

CT/Td<

0.90.

23. The image capturing optical lens assembly of claim 21, wherein a distance in parallel with an optical axis from a critical point on the image-side surface of the fifth lens element to an axial vertex on the image-side surface of the fifth lens element is MSAG52, a central thickness of the fifth lens element is CT5, and the following relationship is satisfied:

0.4<

MSAG52/CT5<

1.5.

24. The image capturing optical lens assembly of claim 21, wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following relationship is satisfied:

1.5<

V2/V1<

3.0.

25. The image capturing optical lens assembly of claim 21, further comprising:

a stop located between the first lens element and the second lens element.

26. An image capturing optical lens assembly comprising, in order from an object side to an image side:

a first lens element with positive refractive power;

a second lens element with positive refractive power having an object-side surface being convex at a paraxial region;

a third lens element with negative refractive power having an object-side surface being concave at a paraxial region;

a fourth lens element with positive refractive power made of plastic material, and having an object-side surface being concave at a paraxial region and an image-side surface being convex at a paraxial region, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric; and

a fifth lens element with negative refractive power made of plastic material and having an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric;

wherein the image capturing optical lens assembly further comprises a stop located between an object and the second lens element, 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 fourth lens element is f4, a focal length of the image capturing optical lens assembly is f, a curvature radius of an image-side surface of the third lens element is R6, and the following relationships are satisfied;

0<

f2/f1<

0.90;

0<

f4/f1<

0.30; and

−

0.85≦

f/R6≦

0.85.

27. The image capturing optical lens assembly of claim 26, wherein a sum of the central thickness from the first through fifth lens elements is Σ

CT, an axial distance between an object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, and the following relationship is satisfied;

0.75<

Σ

CT/Td<

0.90,

28. The image capturing optical lens assembly of claim 27, wherein the focal length of the first lens element is f1 the focal length of the second lens element is f2, and the following relationship is satisfied:

0<

f2/f1<

0.50.

29. The image capturing optical lens assembly of claim 27, wherein a distance in parallel with an optical axis from a critical point on the image-side surface of the fifth lens element to an axial vertex on the image-side surface of the fifth lens element is MSAG52, a central thickness of the fifth lens element is CT5, and the following relationship is satisfied:

0.4<

MSAG52/CT5<

1.5

30. The image capturing optical lens assembly of claim 27, wherein the stop is located between the first lens element and the second lens element.