Image lens assembly, image capturing device and mobile terminal

摘要

An image lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with positive refractive power has a convex object-side surface in a paraxial region thereof. The second lens element with negative refractive power has a concave object-side surface in a paraxial region thereof and a concave image-side surface in a paraxial region thereof. The third lens element with positive refractive power has a concave object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof. The fourth lens element with negative refractive power has a concave image-side surface in a paraxial region thereof. The image lens assembly has a total of four lens elements with refractive power.

主权项

1. An image lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; a second lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface of the second lens element is aspheric; a third lens element with positive refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface of the third lens element is aspheric; and a fourth lens element with negative refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein both of the object-side surface and the image-side surface of the fourth lens element are aspheric, and the image-side surface of the fourth lens element has at least one inflection point; wherein the image lens assembly has a total of four lens elements with refractive power, any two lens elements of the image lens assembly adjacent to each other have a space between the two lens elements, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, a focal length of the second lens element is f2, a focal length of the fourth lens element is f4, and the following conditions are satisfied:
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