IMAGING LENS ASSEMBLY

摘要

An imaging 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 positive first lens element has a convex object-side surface at a paraxial region. The negative second lens element has a concave image-side surface at a paraxial region, wherein the image-side surface thereof has a convex shape at a peripheral region, and the surfaces thereof are aspheric. The positive third lens element has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region. The negative fourth lens element has a concave image-side surface at a paraxial region, wherein the image-side surface thereof has a convex shape at a peripheral region, and the surfaces thereof are aspheric. The imaging lens assembly has a total of four lens elements with refractive power.

主权项

1. An imaging lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having a convex object-side surface at a paraxial region thereof; a second lens element with negative refractive power having a concave image-side surface at a paraxial region thereof, wherein the image-side surface of the second lens element has a convex shape at a peripheral region thereof, and both of an object-side surface and the image-side surface of the second lens element are aspheric; a third lens element with positive refractive power having a convex object-side surface at a paraxial region thereof and a convex image-side surface at a paraxial region; and a fourth lens element with negative refractive power having a concave image-side surface at a paraxial region thereof, wherein the image-side surface of the fourth lens element has a convex shape at a peripheral region thereof, and both of an object-side surface and the image-side surface of the fourth lens element are aspheric; wherein the imaging lens assembly has a total of four lens elements with refractive power, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, 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 imaging lens assembly 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 relationships are satisfied:
0<(T23+T34)/T12<2.0;0