Optical image capturing system
An optical image capturing system includes five lens elements with refractive power, 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 with positive refractive power has a convex object-side surface. The second lens element with negative refractive power has a concave image-side surface. The third lens element has negative refractive power. The fourth lens element with refractive power has a concave image-side surface, and the surfaces of the fourth lens element are aspheric. The fifth lens element with refractive power has a concave image-side surface, wherein at least one inflection point formed on the image-side surface thereof, and the surfaces of the fifth lens element are aspheric.
1. An optical image capturing system comprising five lens elements with refractive power, in order from an object side to an image side:
a first lens element with positive refractive power having a convex object-side surface;
a second lens element with negative refractive power having a concave image-side surface;
a third lens element having negative refractive power;
a fourth lens element with refractive power having a concave image-side surface, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric; and
a fifth lens element with refractive power having a concave image-side surface, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric, and the fifth lens element has at least one inflection point on the image-side surface thereof;
wherein the optical image capturing system has a total of five lens elements with refractive power; and
the optical image capturing system further comprising a stop, wherein the axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, an effective diameter of the stop is AD, and the following relationship is satisfied:
1.2 <Td/AD <2.0;
wherein a focal length of the optical image capturing system is f, a curvature radius of an object-side surface of the third lens element is R 5 , a curvature radius of an image-side surface of the third lens element is R 6 , and the following relationship is satisfied:
f/|R 5|+ f/|R 6|<2.5.
2. The optical image capturing system of claim 1 , wherein the object-side surface of the fifth lens element is convex.
3. The optical image capturing system of claim 2 , wherein an axial distance between the fourth lens element and the fifth lens element is T 45 , an axial distance between the third lens element and the fourth lens element is T 34 , and the following relationship is satisfied:
0.05< T 45/ T 34<0.9.
4. The optical image capturing system of claim 2 , wherein a curvature radius of the object-side surface of the fifth lens element is R 9 , a curvature radius of the image-side surface of the fifth lens element is R 10 , and the following relationship is satisfied:
0<( R 9− R 10)/( R 9+ R 10)<0.2.
5. The optical image capturing system of claim 2 , wherein a central thickness of the second lens element is CT 2 , a central thickness of the third lens element is CT 3 , a central thickness of the fourth lens element is CT 4 , a central thickness of the first lens element is CT 1 , a central thickness of the fifth lens element is CT 5 , and the following relationship is satisfied:
0.3<( CT 2+ CT 3+ CT 4)/( CT 1+ CT 5)<0.7.
6. The optical image capturing system of claim 1 , wherein the focal length of the optical image capturing system is f, the curvature radius of the object-side surface of the third lens element is R 5 , the curvature radius of the image-side surface of the third lens element is R 6 , and the following relationship is satisfied:
f/|R 5|+ f/|R 6|<1.8.
7. The optical image capturing system of claim 6 , wherein the third lens element has a concave object-side surface.
8. The optical image capturing system of claim 6 , wherein a focal length of the first lens element is f 1 , a focal length of the second lens element is f 2 , and the following relationship is satisfied:
−0.50< f 1/ f 2<0.
9. The optical image capturing system of claim 6 , wherein an Abbe number of the second lens element is V 2 , an Abbe number of the third lens element is V 3 , an Abbe number of the fourth lens element is V 4 , and the following relationship is satisfied:
V 2+ V 3+ V 4<85.
10. The optical image capturing system of claim 1 , wherein an axial distance between the stop and the image-side surface of the fifth lens element is Sd, an axial distance between the 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:
0.85< Sd/Td< 0.95.
11. The optical image capturing system of claim 10 , wherein the focal length of the optical image capturing system is f, a focal length of the third lens element is f 3 , a focal length of the fourth lens element is f 4 , a focal length of the fifth lens element is f 5 , and the following relationship is satisfied:
| f/f 3|+| f/f 4|+| f/f 5|<0.6.
12. The optical image capturing system of claim 1 , wherein a distance in parallel with an optical axis from an axial vertex on the object-side surface of the fourth lens element to 50% of a maximum effective diameter position on the object-side surface of the fourth lens element is SAGM 41 , a distance in parallel with the optical axis from an axial vertex on the object-side surface of the fourth lens element to the maximum effective diameter position on the object-side surface of the fourth lens element is SAG 41 , and the following relationship is satisfied:
| SAGM 41/( SAG 41 −SAGM 41)|<0.25.
13. The optical image capturing system of claim 1 , wherein the focal length of the optical image capturing system is f, a curvature radius of the image-side surface of the fourth lens element is R 8 , and the following relationship is satisfied:
0 <f/R 8<1.5.
14. An optical image capturing system comprising five lens elements with refractive power, in order from an object side to an image side:
a first lens element with positive refractive power having a convex object-side surface;
a second lens element having refractive power;
a third lens element having negative refractive power;
a fourth lens element with refractive power having a concave image-side surface, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric; and
a fifth lens element with refractive power having a concave image-side surface, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric, and the fifth lens element has at least one inflection point on the image-side surface thereof;
wherein the optical image capturing system has a total of five lens elements with refractive power; and
wherein an Abbe number of the first lens element is V 1 , an Abbe number of the fourth lens element is V 4 , and the following relationship is satisfied:
0.20< V 4/ V 1<0.57; and
wherein a central thickness of the second lens element is CT 2 , a central thickness of the third lens element is CT 3 , a central thickness of the fourth lens element is CT 4 , a central thickness of the first lens element is CT 1 , a central thickness of the fifth lens element is CT 5 , and the following relationship is satisfied:
0.3<( CT 2+ CT 3+ CT 4)/( CT 1+ CT 5)<0.7.
15. The optical image capturing system of claim 14 , wherein the fourth lens element has negative refractive power.
16. The optical image capturing system of claim 14 , wherein the second lens element has a concave image-side surface, and the third lens element has a concave object-side surface.
17. The optical image capturing system of claim 14 , wherein the object-side surface of the fifth lens element is convex.
18. The optical image capturing system of claim 14 , wherein an f-number of the optical image capturing system is Fno, and the following relationship is satisfied:
Fno<2.2.
19. The optical image capturing system of claim 14 , wherein a focal length of the optical image capturing system is f, a focal length of the third lens element is f 3 , a focal length of the fourth lens element is f 4 , a focal length of the fifth lens element is f 5 , and the following relationship is satisfied:
|f/f 3 |+|f/f 4 |+|f/f 5|<0.6.
20. The optical image capturing system of claim 14 , wherein a distance in parallel with an optical axis from an axial vertex on the object-side surface of the fourth lens element to 50% of a maximum effective diameter position on the object-side surface of the fourth lens element is SAGM 41 , a distance in parallel with the optical axis from an axial vertex on the object-side surface of the fourth lens element to the maximum effective diameter position on the object-side surface of the fourth lens element is SAG 41 , and the following relationship is satisfied:
|SAGM 41/( SAG 41 −SAGM 41)|<0.25.
21. The optical image capturing system of claim 14 , wherein the image-side surface of the fourth lens element has at least one convex shape at an off-axis region.
22. The optical image capturing system of claim 14 , wherein a focal length of the optical image capturing system is f, a curvature radius of the object-side surface of the third lens element is R 5 , a curvature radius of the image-side surface of the third lens element is R 6 , and the following relationship is satisfied:
f/|R 5|+ f/|R 6|<2.5.