IMAGE CAPTURING OPTICAL LENS SYSTEM

• US 20140111876A1
• Filed: 12/10/2012
• Published: 04/24/2014
• Est. Priority Date: 10/22/2012
• Status: Active Grant

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: Tang, Hsiang-Chi, Tsai, Tsung-Han, Huang, Hsin-Hsuan
• Granted Patent: US 8,934,178 B2
• Time in Patent Office: Days
• US Class Current: 359/757
• 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 27/0025 for optical correction, e.g. distorsion, aberration
• CPC Class Codes: G02B 9/62 having six components only

Abstract

An image capturing optical lens system 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 a convex object-side surface. The second lens element has negative refractive power. The third lens element has refractive power. The fourth lens element has refractive power, wherein at least one surface of the fourth lens element is aspheric. The fifth lens element with negative refractive power has a concave object-side surface and a convex image-side surface, and the surfaces thereof are aspheric. The sixth lens element with refractive power has an image-side surface changing from concave at a paraxial region thereof to convex at a peripheral region thereof, and the surfaces thereof are aspheric.

Claims

1. An image capturing optical lens system 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 at a paraxial region thereof;

a second lens element having negative refractive power;

a third lens element having refractive power;

a fourth lens element having refractive power, wherein at least one of an object-side surface and an image-side surface of the fourth lens element is aspheric;

a fifth lens element with negative refractive power having an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein the object-side surface and the image-side surface of the fifth lens element are aspheric; and

a sixth lens element with refractive power having an image-side surface, wherein the image-side surface of the sixth lens element changes from concave at a paraxial region thereof to convex at a peripheral region thereof, and an object-side surface and the image-side surface of the sixth lens element are aspheric;

wherein a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, and the following relationship is satisfied;

−

3.0<

(R1+R2)/(R1−

R2)<

0.

2. The image capturing optical lens system of claim 1, wherein the fourth lens element with positive refractive power has an image-side surface being convex at a paraxial region thereof.

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

4. The image capturing optical lens system of claim 3, wherein the object-side surface of the sixth lens element is convex at a paraxial region thereof.

5. The image capturing optical lens system of claim 4, wherein the image-side surface of the first lens element is concave at a paraxial region thereof.

6. The image capturing optical lens system of claim 4, wherein the second lens element has an object-side surface being convex at a paraxial region thereof.

7. The image capturing optical lens system of claim 4, 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 relationship is satisfied:

−

0.50<

(R9−

R10)/(R9+R10)<

0.

8. The image capturing optical lens system of claim 4, wherein an Abbe number of the fifth lens element is V5, an Abbe number of the sixth lens element is V6, and the following relationship is satisfied:

0.20<

V5/V6<

0.70.

9. The image capturing optical lens system of claim 4, wherein a focal length of the image capturing optical lens system is f, a focal length of the fifth lens element is f5, and the following relationship is satisfied:

−

1.20<

f/f5<

−

0.20.

10. The image capturing optical lens system of claim 4, wherein a central thickness of the fifth lens element is CT5, a central thickness of the sixth lens element is CT6, and the following relationship is satisfied:

0.10<

CT5/CT6<

0.50.

11. The image capturing optical lens system of claim 3, wherein a focal length of the image capturing optical lens system is f, a focal length of the fourth lens element is f4, and the following relationship is satisfied:

0.6<

f/f4<

1.8.

12. The image capturing optical lens system of claim 3, wherein an axial distance between the image-side surface of the sixth lens element and an image plane is BFL, 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, and the following relationship is satisfied:

0.15<

BFL/Td<

0.40.

13. The image capturing optical lens system 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 fifth lens element is V5, and the following relationship is satisfied:

0.6<

(V2+V5)/V1<

1.0.

14. The image capturing optical lens system of claim 1, wherein a central thickness of the second lens element is CT2, an angle between a tangent of an inflection point on the image-side surface of the sixth lens element and an optical axis is α

, and the following relationship is satisfied;

0 mm<

CT2/tan(α

)<

0.30 mm.

15. The image capturing optical lens system of claim 2, wherein a maximum image height of the image capturing optical lens system is ImgH, a focal length of the image capturing optical lens system is f, and the following relationship is satisfied:

0.72<

ImgH/f<

1.0.

16. The image capturing optical lens system of claim 2, wherein a focal length of the image capturing optical lens system is f, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, and the following relationship is satisfied:

0.3<

(|f/f5|+|f/f6|)/(f/f4)<

1.5.

17. The image capturing optical lens system of claim 2, wherein a maximum image height of the image capturing optical lens system is ImgH, an axial distance between the object-side surface of the first lens element and an image plane is TTL, and the following relationship is satisfied:

TTL/ImgH<

1.8.

18. An image capturing optical lens system 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 at a paraxial region thereof;

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

a third lens element having refractive power;

a fourth lens element with refractive power having an image-side surface being convex at a paraxial region thereof, wherein at least one of an object-side surface and the image-side surface of the fourth lens element is aspheric;

a fifth lens element with negative refractive power having an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein the object-side surface and the image-side surface of the fifth lens element are aspheric; and

a sixth lens element with refractive power having an image-side surface, wherein the image-side surface of the sixth lens element changes from concave at a paraxial region thereof to convex at a peripheral region thereof, and an object-side surface and the image-side surface of the sixth lens element are aspheric;

wherein an Abbe number of the fifth lens element is V5, an Abbe number of the sixth lens element is V6, and the following relationship is satisfied;

0.20<

V5/V6<

0 70.

19. The image capturing optical lens system of claim 18, 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 relationship is satisfied:

−

0.35<

(R9−

R10)/(R9+R10)<

0,

20. The image capturing optical lens system of claim 18, wherein a maximum image height of the image capturing optical lens system is ImgH, a focal length of the image capturing optical lens system is f, and the following relationship is satisfied:

0.72<

ImgH/f<

1.0.

21. An image capturing optical lens system 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 at a paraxial region thereof;

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

a third lens element having refractive power;

a fourth lens element having refractive power, wherein at least one of an object-side surface and an image-side surface of the fourth lens element is aspheric;

a fifth lens element with negative refractive power having an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein the object-side surface and the image-side surface of the fifth lens element are aspheric; and

a sixth lens element with refractive power having an image-side surface, wherein the image-side surface of the sixth lens element changes from concave at a paraxial region thereof to convex at a peripheral region thereof, and an object-side surface and the image-side surface of the sixth lens element are aspheric;

wherein a focal length of the image capturing optical lens system is f, a focal length of the second lens element is f2, a focal length of the fifth lens element is f5, a curvature radius of the image-side surface of the sixth lens element is R12, and the following relationships are satisfied;

−

1.50<

f/f5<

−

0.20;

and

−

1.0<

R12/f2<

0

22. The image capturing optical lens system of claim 21, wherein the image-side surface of the fourth lens element is convex at a paraxial region thereof, an axial distance between the image-side surface of the sixth lens element and an image plane is BFL, 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, and the following relationship is satisfied:

0.15<

BFL/Td<

0.4.

23. The image capturing optical lens system of claim 21, wherein a central thickness of the second lens element is CT2, an angle between a tangent of an inflection point on the image-side surface of the sixth lens element and an optical axis is α

, and the following relationship is satisfied;

0 mm<

CT2/tan(α

)<

0.15 mm.

24. The image capturing optical lens system of claim 21, wherein the focal length of the image capturing optical lens system is f, a focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, and the following relationship is satisfied:

0.3<

(|f/f5|+|f/f6|)/(f/f4)<

1.5.