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:
• an optical axis region of the object-side surface of the second lens element is convex;
• an optical axis region of the object-side surface of the third lens element is concave;
• the fourth lens element has negative refracting power;
• an optical axis region of the object-side surface of the fifth lens element is concave;
• and
• an optical axis region of the object-side surface of the sixth lens element is concave;
• wherein the optical imaging lens has only six lens elements, ImgH is an image height of the optical imaging lens, Fno is the f-number of the optical imaging lens, EFL is an effective focal length of the optical imaging lens, Gmax is the largest air gap from the first lens element to the sixth lens element, Tmax is the largest thickness of a lens element from the first lens element to the sixth lens element to satisfy the relationship:
• ImgH/Fno≥2.000 mm and (EFL+ImgH)/(Tmax+Gmax)≥6.000.

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:
• an optical axis region of the object-side surface of the second lens element is convex;
• an optical axis region of the object-side surface of the third lens element is concave;
• the fourth lens element has negative refracting power;
• an optical axis region of the object-side surface of the fifth lens element is concave;
• and
• an optical axis region of the object-side surface of the sixth lens element is concave and a periphery region of the image-side surface of the sixth lens element is convex;
• wherein the optical imaging lens has only six lens elements, ImgH is an image height of the optical imaging lens, Fno is the f-number of the optical imaging lens, EFL is an effective focal length of the optical imaging lens, Gmax is the largest air gap from the first lens element to the sixth lens element, Gmax2 is the second largest air gap from the first lens element to the sixth lens element to satisfy the relationship:
• ImgH/Fno≥2.000 mm and (EFL+ImgH)/(Gmax+Gmax2)≥9.300.