Mobile device and optical imaging lens

摘要

An optical imaging lens includes first, second, third, fourth and fifth lens elements positioned sequentially from an object side to an image side. The first lens element with positive refractive power has an object-side surface comprising a convex portion in the optical axis vicinity. The second lens element with negative refractive power has an object-side surface comprising a convex portion in the optical axis vicinity and an image-side surface comprising a concave portion in the optical axis vicinity. The third lens element has an image-side surface comprising a convex portion in the periphery. The fourth lens element has an image-side surface comprising a convex portion in the optical axis vicinity. The fifth lens element has an object-side surface comprising a convex portion in the optical axis vicinity and an image-side surface comprising a concave portion in the optical axis vicinity and a convex portion in the periphery.

主权项

1. An optical imaging lens, sequentially from an object side to an image side, comprising first, second, third, fourth and fifth lens elements, each of said first, second, third, fourth and fifth lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein:
said first lens element has positive refractive power, and said object-side surface thereof comprises a convex portion in a vicinity of the optical axis; said second lens element has negative refractive power, said object-side surface thereof comprises a convex portion in vicinity of the optical axis, and said image-side surface thereof comprises a concave portion in a vicinity of the optical axis; said image-side surface of said third lens element comprises a convex portion in a vicinity of a periphery of the third lens element; said image-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis; said object-side surface of said fifth lens element comprises a convex portion in a vicinity of the optical axis, and said image-side surface of said fifth lens element comprises a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of the fifth lens element; said optical imaging lens as a whole having only the five lens elements having refractive power, wherein the sum of the thickness of all five lens elements along the optical axis is defined as ALT, the central thickness of the first lens element along the optical axis is T1, and ALT and T1 satisfy the equation:ALTT1≤4,⁢and⁢ wherein said optical imaging lens satisfies the relation:
Gaa≦0.91 mm, wherein Gaa is a sum of all air gaps from the first lens element to the fifth lens element along the optical axis, and wherein said optical imaging lens further satisfies the relation:GaaG12+G45≤5.5, wherein G12 is an air gap between the first lens element and the second lens element along the optical axis and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis, and wherein Gaa, G12 and G45 satisfy the equations:11.5≤GaaG12;⁢⁢and⁢⁢G45G12≤5.5.”