Optical imaging lens and electronic device comprising the same

An optical imaging lens set, comprising:

• a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element from an object side toward an image side in order along an optical axis and each lens element has an object-side surface facing toward said object side and allowing imaging light to pass through as well as an image-side surface facing toward said image side and allowing said imaging light to pass through, wherein:
• said first lens element has negative refractive power;
• said second lens element has a second object-side surface with a convex portion in a vicinity of a circular periphery of said second lens element;
• said third lens element has a third object-side surface with a convex portion in a vicinity of a circular periphery of said third lens element;
• said fourth lens element has refractive power;
• said fifth lens element has a fifth image-side surface with a convex portion in a vicinity of said optical axis;
• and
• said sixth lens element has a sixth object-side surface with a concave portion in a vicinity of a circular periphery of said sixth lens element, wherein said optical imaging lens set exclusively has six lens elements with refractive power, and a distance Ltt from said first object-side surface to an imaging plane on said image side along said optical axis and an air gap G23 between said second lens element and said third lens element along said optical axis satisfy a relationship Ltt/G23≦20.0.