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 seven lens elements, the seven lens elements being, 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;
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 towards the object side and an image-side surface facing towards the image side;
wherein the first lens element has positive refractive power; the second lens element has negative refractive power; the fifth lens element has negative refractive power; the object-side surface of the seventh lens element comprises at least one inflection point; a central thickness of the second lens element is smaller than a central thickness of the third lens element; an axial distance between the first lens element and the second lens element is smaller than an axial distance between the sixth lens element and the seventh lens element;
wherein a 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, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following conditions are satisfied:
| f/f 3|+| f/f 4|<1.0; and
28< V 1− V 2<42.
2. The optical image capturing system of claim 1 , wherein the fourth lens element has positive refractive power, the image-side surface of the third lens element is convex in a paraxial region thereof, the image-side surface of the fourth lens element is convex in a paraxial region thereof, the image-side surface of the fifth lens element is convex in a paraxial region thereof.
3. The optical image capturing system of claim 1 , wherein the image-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the third lens element is concave in a paraxial region thereof.
4. The optical image capturing system of claim 1 , wherein the image-side surface of the seventh lens element comprises at least one inflection point, each of at least four of the seven lens elements has at least one of the object-side surface and the image-side surface being aspheric.
5. The optical image capturing system of claim 1 , 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 condition is satisfied:
0.1< Yc 72/ f< 0.9.
6. The optical image capturing system of claim 1 , wherein an absolute value of a focal length of the fifth lens element is smaller than an absolute value of the focal length of the third lens element, an absolute value of a curvature radius of the image-side surface of the first lens element is smaller than an absolute value of a curvature radius of the object-side surface of the seventh lens element.
7. An optical image capturing system comprising seven lens elements, the seven lens elements being, 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;
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 towards the object side and an image-side surface facing towards the image side;
wherein the first lens element has positive refractive power; the second lens element has negative refractive power; the image-side surface of the fourth lens element is convex in a paraxial region thereof; the fifth lens element has negative refractive power; the image-side surface of the seventh lens element is concave in a paraxial region thereof, the object-side surface of the seventh lens element comprises at least one inflection point, the image-side surface of the seventh lens element comprises at least one inflection point;
wherein a 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 condition is satisfied:
| f/f 3|+| f/f 4|<1.0.
8. The optical image capturing system of claim 7 , wherein the fourth lens element has positive refractive power, the image-side surface of the fifth lens element is convex in a paraxial region thereof.
9. The optical image capturing system of claim 7 , wherein the object-side surface of the third lens element is concave in a paraxial region thereof, 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.
10. The optical image capturing system of claim 7 , wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following condition is satisfied:
28< V 1− V 2<42.
11. The optical image capturing system of claim 7 , wherein there is no relative movement between any two 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, 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 condition is satisfied:
0.1< Yc 72/ f< 0.9.
12. The optical image capturing system of claim 7 , wherein a central thickness of the second lens element is smaller than a central thickness of the fifth lens element, an axial distance between the second lens element and the third lens element is smaller than an axial distance between the sixth lens element and the seventh lens element.
13. An optical image capturing system comprising seven lens elements, the seven lens elements being, 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;
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 towards the object side and an image-side surface facing towards the image side;
wherein the first lens element has positive refractive power; the second lens element has negative refractive power; the fourth lens element has positive refractive power; the fifth lens element has negative refractive power; the object-side surface of the seventh lens element comprises at least one inflection point, the image-side surface of the seventh lens element comprises at least one inflection point; an axial distance between the first lens element and the second lens element is smaller than an axial distance between the sixth lens element and the seventh lens element;
wherein a 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 condition is satisfied:
| f/f 3|+| f/f 4|<1.0.
14. The optical image capturing system of claim 13 , wherein the image-side surface of the third lens element is convex in a paraxial region thereof, the image-side surface of the fifth lens element is convex in a paraxial region thereof, an absolute value of a focal length of the fifth lens element is smaller than an absolute value of a focal length of the second lens element.
15. The optical image capturing system of claim 13 , wherein the sixth lens element has positive refractive power, the seventh lens element has negative refractive power.
16. The optical image capturing system of claim 13 , wherein there is no relative movement between any two 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, 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 condition is satisfied:
0.30≤ Yc 72/ f< 0.9.
17. The optical image capturing system of claim 13 , wherein an axial distance between the third lens element and the fourth lens element is smaller than the axial distance between the sixth lens element and the seventh lens element, an absolute value of a curvature radius of the image-side surface of the fifth lens element is smaller than an absolute value of a curvature radius of the object-side surface of the seventh lens element.