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 a convex portion near a circumference of the first lens element, and the image-side surface of the first lens element has a concave portion in a vicinity of the optical axis; the second lens element has a negative refracting power, the object-side surface of the second lens element has a convex portion in a vicinity of an optical axis, and the image-side surface of the second lens element has a concave portion in a vicinity of the optical axis and a concave portion near the circumference of the second lens element; the image-side surface of the third lens element has a convex portion in a vicinity of an optical axis and a convex portion near a circumference of the third lens element; the object-side surface of the fourth lens element has a concave portion in a vicinity of the optical axis and a concave portion near a circumference of the fourth lens element, and the image-side surface of the fourth lens element has a convex portion in a vicinity of the optical axis and a convex portion near the circumference of the fourth lens element; the object-side surface of the fifth lens element has a convex portion in a vicinity of the optical axis, the image-side surface of the fifth lens element has a concave portion in a vicinity of the optical axis and a convex portion near a circumference of the fifth lens element; the optical imaging lens has only five lens elements having a refracting power; and the optical imaging lens satisfies the following relations:
0.8≦T1/T3≦1.8;1.4≦T4/T2≦2.3;and1.5≦AAG/T1≦2.6, wherein T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, 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, and AAG is a sum of widths of air gaps between the first to fifth lens elements. |