IMAGE LENS ASSEMBLY SYSTEM

摘要

An image lens assembly 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 negative refractive power has a convex object-side surface. The second lens element has positive refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element has refractive power. The sixth lens element with refractive power is made of plastic material, wherein at least one surface of the sixth lens element is aspheric. The seventh lens element with refractive power made of plastic material has a concave image-side surface changing from concave in a paraxial region to convex in a peripheral region, and at least one surface thereof is aspheric.

主权项

1. An image lens assembly system comprising, in order from an object side to an image side:
a first lens element; a second lens element having positive refractive power; a third lens element; a fourth lens element; a fifth lens element; a sixth lens element having at least one of an object-side surface and an image-side surface being aspheric; and a seventh lens element with negative refractive power having a concave image-side surface, wherein the image-side surface of the seventh lens element changes from concave in a paraxial region thereof to convex in a peripheral region thereof, and at least one of an object-side surface and the image-side surface thereof is aspheric; wherein the image lens assembly system has a total of seven lens elements, there is a gap between every two adjacent lens elements 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 that are adjacent to each other, a sum of central thicknesses from the first through seventh lens elements is ΣCT, an axial distance between an object-side surface of the first lens element and the image-side surface of the seventh lens element is Td, and the following relationship is satisfied:
0.60<ΣCT/Td<0.90.