Optical imaging lens and electronic device comprising the same

An optical imaging lens set, from an object side toward an image side in order along an optical axis 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, said first to sixth lens elements having an object-side surface facing toward the object side as well as an image-side surface facing toward the image side, wherein:
• said first lens element has an image-side surface with a concave part in a vicinity of its periphery;
• said second lens element has an object-side surface with a convex part in a vicinity of its periphery;
• said third lens element has an object-side surface with a convex part in a vicinity of its periphery;
• said fourth lens element has positive refractive power;
• said fifth lens element has an image-side surface with a concave part in a vicinity of the optical axis;
• said sixth lens element has an image-side surface with a concave part in a vicinity of the optical axis;
• and
• a thickness T4 of said fourth lens element along said optical axis, and a distance BFL between the image-side surface of said sixth lens element to an image plane satisfy a relationship 1.0≦BFL/T4, in addition, the optical imaging lens set does not include any lens element with refractive power other than said first, second, third, fourth, fifth and sixth lens elements.