Imaging lens having five lens elements and electronic apparatus having the same

摘要

An optical imaging lens includes, from an object side to an image side, an aperture stop, first, second, third, fourth, and fifth lens elements. The first lens element has a positive refracting power, its object-side surface has a convex portion in a vicinity of an optical axis, and its image-side surface has a concave portion in the vicinity of the optical axis. The second lens element has a negative refracting power, and its image-side surface is concave. The fourth lens element has a convex image-side surface. The object-side surface of the fifth lens element has a convex portion in the vicinity of the optical axis, and the image-side surface of the fifth lens element has a concave portion in the vicinity of the optical axis.

主权项

1. An optical imaging lens comprising, from an object side to an image side, an aperture stop, a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element, each of the first, second, third, fourth and fifth lens element having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein:
the first lens element has a positive refracting power, the object-side surface of the first lens element has a convex portion in a vicinity of an optical axis, and the image-side surface of the first lens element has a concave portion in the vicinity of the optical axis; the second lens element has a negative refracting power and the image-side surface of the second lens element is concave; the image-side surface of the fourth lens element is convex; the object-side surface of the fifth lens element has a convex portion in the vicinity of the optical axis and the image-side of the fifth lens element has a concave portion in the vicinity of the optical axis; the optical imaging lens has only five lens elements having a refracting power; and a ratio (T3+T4+AG23)/T1 is between 2.26 and 2.52, wherein T3 is a thickness of the third lens element along the optical axis, T4 is a thickness of the fourth lens element along the optical axis, AG23 is a width of an air gap between the second and third lens element along the optical axis, and T1 is a thickness of the first lens element along the optical axis.