Optical imaging lens

An optical imaging lens, from an object side to an image side in order along an optical axis comprising:

• a first lens element, a second lens element, a third lens element, and a fourth lens element, each of the first lens element to the fourth lens element having an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through, wherein:
• the first lens element has positive refracting power;
• an optical axis region of the object-side surface of the first lens element is convex;
• and
• wherein lens elements included by the optical imaging lens are only the four lens elements described above;
• wherein an Abbe number of the first lens element is υ1, an Abbe number of the second lens element is υ2, an Abbe number of the fourth lens element is υ4, TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis, AAG is a sum of three air gaps from the first lens element to the fourth lens element along the optical axis and HFOV stands for a half field of view of the optical imaging lens, and the optical imaging lens satisfies the relationships:
• υ1+υ2≥2*υ4, TTL/AAG≥10.000 and HFOV≤15.000°.