Patent ID: 8773767

Claim:
An optical imaging lens, in an order from an object side to an image side, comprises: a first lens element with positive refractive power, comprising a convex object-side curved surface; a second lens element with negative refractive power, comprising a concave image-side curved surface; a third lens element, comprising an object-side curved surface and an image-side curved surface, the object-side curved surface comprising a concave portion in a vicinity of a periphery, and the image-side curved surface comprising a convex portion in a vicinity of a periphery of the third lens element; a fourth lens element, comprising a convex image-side curved surface; a fifth lens element, comprising an object-side curved surface and an image-side curved surface, the object-side curved surface comprising a convex portion in a vicinity of the optical axis, and the image-side curved surface comprising a concave portion in a vicinity of the optical axis; lens as a whole having only the five lens elements with refractive power, wherein a central thickness of the second lens element along the optical axis is T 2 , a sum of all air gaps between the first lens element to the fifth lens element along the optical axis is G aa , and they satisfy the relation: 0.20 <T 2<0.50 (mm); and 0.27<( T 2 /G aa )<0.40.