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, a fourth lens element, a fifth lens element, and a sixth lens element, the first lens element to the sixth lens element each 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 image-side surface of the sixth lens element is convex;
• lens elements included by the optical imaging lens are only the six lens elements described above;
• a sum of the five air gaps from the first lens element to the sixth lens element along the optical axis is greater than a sum of the thicknesses of the six lens elements from the first lens element to the sixth lens element along the optical axis;
• a maximum air gap is between the second lens element and the fourth lens element;
• an object-side surface and an image-side surface of one of the second lens element to the fifth lens element are aspheric surfaces;
• and wherein the optical imaging lens satisfies the relationships:
• 3.200≤EFL/ImgH and 2.000≤EFL/ALT≤3.900, wherein EFL is an effective focal length of the optical imaging lens, ImgH is an image height of the optical imaging lens, ALT is a sum of thicknesses of all the six lens elements along the optical axis.

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, a fourth lens element, a fifth lens element, and a sixth lens element, the first lens element to the sixth lens element each 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 second lens element has negative refracting power;
• a periphery region of the object-side surface of the fourth lens element is concave;
• a periphery region of the image-side surface of the sixth lens element is convex;
• lens elements included by the optical imaging lens are only the six lens elements described above;
• a sum of the five air gaps from the first lens element to the sixth lens element along the optical axis is greater than a sum of the thicknesses of the six lens elements from the first lens element to the sixth lens element along the optical axis;
• a maximum air gap is between the first lens element and the fourth lens element;
• an object-side surface and an image-side surface of one of the second lens element to the fifth lens element are aspheric surfaces;
• and wherein the optical imaging lens satisfies the relationships:
• 2.900≤EFL/ImgH and 2.000≤EFL/ALT≤3.900, wherein EFL is an effective focal length of the optical imaging lens, ImgH is an image height of the optical imaging lens, ALT is a sum of thicknesses of all the six lens elements along the optical axis.