Imaging lens, and electronic apparatus including the same

摘要

An imaging lens includes first to fifth lens elements arranged from an object side to an image side in the given order. Through designs of surfaces of the lens elements and relevant lens parameters, a short system length of the imaging lens may be achieved while maintaining good optical performance.

主权项

1. An imaging lens comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in order from an object side to an image side along an optical axis of said imaging lens, each of said first lens element, said second lens element, said third lens element, said fourth lens element and said fifth lens element having a refractive power, an object-side surface facing toward the object side, and an image-side surface facing toward the image side, wherein:
said object-side surface of said first lens element is a convex surface, and has a convex portion in a vicinity of the optical axis, and a convex portion in a vicinity of a periphery of said first lens element; said image-side surface of said second lens element is a concave surface, and has a concave portion in a vicinity of the optical axis, and a concave portion in a vicinity of a periphery of said second lens element; said third lens element is made of a plastic material; said object-side surface of said fourth lens element has a sag value of Sag_r0 at the optical axis, a sag value of Sag_r1 at a surface point thereof corresponding to a distance of ⅓ of an effective optical radius thereof from the optical axis in a radially outward direction, a sag value of Sag_r2 at a surface point thereof corresponding to a distance of ⅔ of the effective optical radius thereof from the optical axis in the radially outward direction, and a sag value of Sag_r3 at a surface point thereof corresponding to a distance of the effective optical radius thereof from the optical axis in the radially outward direction, said object-side surface of said fourth lens element satisfying:
|Sag—r1−Sag—r0|>|Sag—r2−Sag—r1| andSag—r3−Sag—r2|>|Sag—r2−Sag—r1|; said image-side surface of said fifth lens element has a concave portion in a vicinity of the optical axis, and a convex portion in a vicinity of a periphery of said fifth lens element; and said imaging lens does not include any lens element with refractive power other than said first lens element, said second lens element, said third lens element, said fourth lens element and said fifth lens element.