Optical image capturing system
An optical image capturing 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, a sixth lens element and a seventh lens element. The first, the second and the third lens elements all have refractive power. The fourth lens element with refractive power has both surfaces being aspheric. The fifth lens element with refractive power has both surfaces being aspheric. The sixth lens element with refractive power has an image-side surface having at least one convex shape at a peripheral region thereof and both surfaces being aspheric. The seventh lens element with refractive power has an image-side surface having at least one convex shape at a peripheral region thereof, wherein both surfaces being aspheric, and at least one surface has at least one inflection point thereon.
1. An optical image capturing system comprising, in order from an object side to an image side thereof, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element, wherein each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has an object-side surface facing toward the object side, and an image-side surface facing toward the image side, wherein:
the first lens element having positive refractive power;
the second lens element having negative refractive power,
the fifth lens element having the object-side surface and the image-side surface being both aspheric;
the sixth lens element with positive refractive power having at least one convex shape at a peripheral region of the image-side surface thereof, wherein the object-side surface and the image-side surface of the sixth lens element are both aspheric; and
the seventh lens element with negative refractive power having at least one convex shape at a peripheral region of the image-side surface thereof, wherein the object-side surface and the image-side surface of the seventh lens element are both aspheric, and at least one of the object-side surface and the image-side surface of the seventh lens element has at least one inflection point thereon;
wherein the optical image capturing system has a total of seven lens elements, a maximal field of view of the optical image capturing system is FOV, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following relationships are satisfied:
72 degrees<FOV<95 degrees; and
28< V 1− V 2≦37.8.
2. The optical image capturing system of claim 1 , wherein the first lens element has the object-side surface being convex at a paraxial region thereof, and the second lens element has the image-side surface being concave at a paraxial region thereof.
3. The optical image capturing system of claim 1 , wherein the sixth lens element has the image-side surface being convex at a paraxial region thereof, and the seventh lens element has the image-side surface being concave at a paraxial region thereof.
4. The optical image capturing system of claim 1 , wherein a curvature radius of the object-side surface of the seventh lens element is R13, a curvature radius of the image-side surface of the seventh lens element is R14, and the following relationship is satisfied:
−5.0< R 14/ R 13<1.0.
5. The optical image capturing system of claim 1 , wherein a focal length of the optical image capturing system is f, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, and the following relationship is satisfied:
1.8<| f/f 6|+| f/f 7|<6.0.
6. The optical image capturing system of claim 1 , wherein a maximum image height of the optical image capturing system is ImgH, an axial distance between the object-side surface of the first lens element and an image plane is TTL, an axial distance from the object-side surface of the first lens element to the image-side surface of the seventh lens element is Td, a focal length of the optical image capturing system is f, and the following relationships are satisfied:
1.00 <TTL /Img H <1.70; and
0.50< Td/f< 1.35.
7. An optical image capturing system comprising, in order from an object side to an image side thereof, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element, wherein each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has an object-side surface facing toward the object side, and an image-side surface facing toward the image side, wherein:
the first lens element having positive refractive power;
the fourth lens element having at least one of the object-side surface and the image-side surface having at least one inflection point thereon;
the sixth lens element having at least one convex shape at a peripheral region of the image-side surface thereof, wherein the object-side surface and the image-side surface of the sixth lens element are both aspheric; and
the seventh lens element with negative refractive power having at least one convex shape at a peripheral region of the image-side surface thereof, wherein the object-side surface and the image-side surface of the seventh lens element are both aspheric, and at least one of the object-side surface and the image-side surface of the seventh lens element has at least one inflection point thereon;
wherein the optical image capturing system has a total of seven lens elements, the optical image capturing system further comprises an aperture stop positioned on the object side of the third lens element, a maximal field of view of the optical image capturing system is FOV, an axial distance from the object-side surface of the first lens element to the image-side surface of the seventh lens element is Td, a focal length of the optical image capturing system is f, and the following relationships are satisfied:
72 degrees<FOV<95 degrees; and
0.50< Td/f< 1.35.
8. The optical image capturing system of claim 7 , wherein the first lens element has the image-side surface being concave at a paraxial region thereof, and the second lens element has the object-side surface being convex at a paraxial region thereof.
9. The optical image capturing system of claim 7 , wherein the fifth lens element has the object-side surface being concave at a paraxial region thereof and the image-side surface being convex at a paraxial region thereof.
10. The optical image capturing system of claim 7 , wherein the seventh lens element has the object-side surface being concave at a paraxial region thereof.
11. The optical image capturing system of claim 7 , wherein the object-side surface of the sixth lens element changes from convex at a paraxial region thereof to concave at a peripheral region thereof.
12. The optical image capturing system of claim 7 , wherein the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element are made of plastic materials; each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is a single and non-cemented lens element, 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:
28< V 1− V 2<42.
13. The optical image capturing system of claim 7 , wherein the focal length of the optical image capturing system is f, a focal length of the seventh lens element is f7, and the following relationship is satisfied:
−3.0< f/f 7<−1.3.
14. The optical image capturing system of claim 7 , wherein the focal length of the optical image capturing system is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following relationship is satisfied:
| f/f 3|+| f/f 4|<1.0.
15. The optical image capturing system of claim 7 , wherein the focal length of the optical image capturing system is f, a vertical distance from a critical point on the image-side surface of the seventh lens element to an axial vertex on the image-side surface of the seventh lens element is Yc72, and the following relationship is satisfied:
0.1< Yc 72/ f< 0.9.
16. The optical image capturing system of claim 7 , wherein an axial distance between the second lens element and the third lens element is smaller than an axial distance between the fourth lens element and the fifth lens element.
17. The optical image capturing system of claim 7 , wherein an axial distance between the sixth lens element and the seventh lens element is smaller than an axial distance between the second lens element and the third lens element.
18. An optical image capturing system comprising, in order from an object side to an image side thereof, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element, wherein each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has an object-side surface facing toward the object side, and an image-side surface facing toward the image side, wherein:
the first lens element having at least one convex shape at a peripheral region of the object-side surface thereof;
the fourth lens element having at least one of the object-side surface and the image-side surface having at least one inflection point thereon;
the sixth lens element having at least one convex shape at a peripheral region of the image-side surface thereof, wherein the object-side surface and the image-side surface of the sixth lens element are both aspheric; and
the seventh lens element having the image-side surface being concave at a paraxial region thereof, wherein the image-side surface of the seventh lens element changes from concave at a paraxial region thereof to convex at a peripheral region thereof, and the object-side surface and the image-side surface of the seventh lens element are both aspheric;
wherein the optical image capturing system has a total of seven lens elements, a maximal field of view of the optical image capturing system is FOV, a maximum image height of the optical image capturing system is ImgH, an axial distance between the object-side surface of the first lens element and an image plane is TTL, a curvature radius of the object-side surface of the seventh lens element is R13, a curvature radius of the image-side surface of the seventh lens element is R14, a vertical distance from a critical point on the image-side surface of the seventh lens element to an axial vertex on the image-side surface of the seventh lens element is Yc72, a focal length of the optical image capturing system is f, and the following relationships are satisfied:
72 degrees<FOV<95 degrees;
1.00< TTL /Img H <1.70;
−5.0< R 14/ R 13<1.0; and
0.1< Yc 72/ f< 0.9.
19. The optical image capturing system of claim 18 , wherein the sixth lens element has positive refractive power, and the seventh lens element has negative refractive power.
20. The optical image capturing system of claim 18 , wherein the fifth lens element has negative refractive power.
21. The optical image capturing system of claim 18 , wherein the fifth lens element has the object-side surface being concave at a paraxial region thereof.
22. The optical image capturing system of claim 18 , wherein the focal length of the optical image capturing system is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following relationship is satisfied:
| f/f 3|+| f/f 4|<1.0.
23. The optical image capturing system of claim 18 , wherein the focal length of the optical image capturing system is f, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, and the following relationship is satisfied:
1.8<| f/f 6|+| f/f 7|<6.0.
24. The optical image capturing system of claim 18 , wherein the curvature radius of the object-side surface of the seventh lens element is R13, the curvature radius of the image-side surface of the seventh lens element is R14, and the following relationship is satisfied:
−2.0< R 14/ R 13<0.5.
25. The optical image capturing system of claim 18 , wherein each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is a single and non-cemented lens element, an axial distance from the object-side surface of the first lens element to the image-side surface of the seventh lens element is Td, the focal length of the optical image capturing system is f, and the following relationship is satisfied:
0.50< Td/f< 1.35.
26. The optical image capturing system of claim 18 , 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:
28< V 1− V 2<42.
27. The optical image capturing system of claim 18 , wherein the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element are made of plastic materials, a minimum central thickness of a lens element among the seven lens elements of the optical image capturing system is CTmin, and the following relationship is satisfied:
0.10 mm< CT min<0.30 mm.
28. The optical image capturing system of claim 18 , wherein the object-side surface of the sixth lens element changes from convex at a paraxial region thereof to concave at a peripheral region thereof.
29. The optical image capturing system of claim 18 , further comprising:
an aperture stop positioned on the object side of the second lens element.
30. The optical image capturing system of claim 18 , wherein an absolute value of a focal length of the first lens element is smaller than an absolute value of a focal length of the third lens element.
31. The optical image capturing system of claim 18 , wherein an absolute value of a curvature radius of the object-side surface of the first lens element is smaller than an absolute value of a curvature radius of the image-side surface of the first lens element.
32. The optical image capturing system of claim 18 , wherein an absolute value of a curvature radius of the object-side surface of the second lens element is larger than an absolute value of a curvature radius of the image-side surface of the second lens element.