Optical image capturing system

摘要

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 lens element with positive refractive power has a convex object-side surface. The second through seventh lens elements all have refractive power. The sixth lens element has an object-side surface and an image-side surface which are both aspheric. The seventh lens element has an object-side surface and an image-side surface which are both aspheric, its 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.

主权项

1. An optical image capturing system comprising, in order from an object side to an image side thereof:
a first lens element with positive refractive power having a convex object-side surface; a second lens element with refractive power; a third lens element with refractive power; a fourth lens element with refractive power; a fifth lens element with refractive power; a sixth lens element with refractive power having an object-side surface and an image-side surface which are both aspheric; and a seventh lens element with refractive power having an object-side surface and an image-side surface which are both aspheric, 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; wherein the optical image capturing system has a total of seven lens elements with refractive power, and an air distance between two adjacent surfaces of any two adjacent lens elements; the optical image capturing system further comprises an image sensor, 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 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 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, and the following relationships are satisfied:
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