OPTICAL IMAGE COLLECTING SYSTEM

摘要

An optical image collecting 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 through sixth lens elements all have refractive power. The fifth lens element has a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric. The sixth lens element has a concave image-side surface at a paraxial region, wherein the image-side surface of the sixth lens element changes from concave at the paraxial region to convex at a peripheral region, and both of an object-side surface and the image-side surface of the sixth lens element are aspheric.

主权项

1. An optical image collecting 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 having refractive power; a third lens element having refractive power; a fourth lens element having refractive power; a fifth lens element with refractive power having a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric; and a sixth lens element with refractive power having a concave image-side surface at a paraxial region, wherein the image-side surface of the sixth lens element changes from concave at the paraxial region to convex at a peripheral region, and both of an object-side surface and the image-side surface of the sixth lens element are aspheric, wherein the said optical image collecting system has a total of six lens elements with refractive power; and wherein a focal length of the optical image collecting system is f, a focal length of the fifth lens element is f5, a vertical distance between a non-axial critical point on the image-side surface of the sixth lens element and an optical axis is Yc62, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, and the following relationships are satisfied:
−1.3