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;
• the first lens element has negative refracting power;
• the second lens element has negative refracting power and a periphery region of the object-side surface of the second lens element is convex;
• a periphery region of the image-side surface of the third lens element is concave;
• the fourth lens element has positive refracting power;
• and
• a periphery region of the object-side surface of the fifth lens element is concave and an optical axis region of the image-side surface of the fifth lens element is concave;
• wherein lens elements of the optical imaging lens are only the six lens elements described above, ALT is a sum of thicknesses of all the six lens elements along the optical axis, AAG is a sum of five air gaps from the first lens element to the sixth lens element along the optical axis, EFL is an effective focal length of the optical imaging lens, TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis, and BFL is a distance from the image-side surface of the sixth lens element to the image plane along the optical axis to satisfy the relationships:
• ALT/AAG≤2.500, AAG/EFL≤2.700 and TTL/(EFL+BFL)≥1.800.

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;
• the first lens element has negative refracting power;
• the second lens element has negative refracting power and an optical axis region of the object-side surface of the second lens element is convex;
• a periphery region of the object-side surface of the third lens element is convex and an optical axis region of the image-side surface of the third lens element is concave;
• the fourth lens element has positive refracting power;
• a periphery region of the object-side surface of the fifth lens element is concave and an optical axis region of the image-side surface of the fifth lens element is concave;
• and
• an optical axis region of the image-side surface of the six lens element is convex;
• wherein lens elements of the optical imaging lens are only the six lens elements described above, ALT is a sum of thicknesses of all the six lens elements along the optical axis. AAG is a sum of five air gaps from the first lens element to the sixth lens element along the optical axis, EFL is an effective focal length of the optical imaging lens, TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis, BFL is a distance from the image-side surface of the sixth lens element to the image plane along the optical axis to satisfy the relationships:
• ALT/AAG≥2.500, AAG/EFL≤2.700 and TTL/(EFL+BFL)≥1.800.