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, a sixth lens element and a seventh lens element, the first lens element to the seventh 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 image-side surface of the first lens element is concave;
• the fourth lens element has negative refracting power, and an optical axis region of the image-side surface of the fourth lens element is concave;
• an optical axis region of the object-side surface of the fifth lens element is concave;
• an optical axis region of the image-side surface of the sixth lens element is concave;
• the seventh lens element has negative refracting power;
• wherein lens elements included by the optical imaging lens are only the seven lens elements described above, and wherein the optical imaging lens satisfies the relationship:
• ALT/(T2+G23)≤5.000, wherein ALT is a sum of thicknesses of all the seven lens elements along the optical axis, T2 is a thickness of the second lens element along the optical axis, G23 is an air gap between the second lens element and the third lens element 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, a sixth lens element and a seventh lens element, the first lens element to the seventh 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 image-side surface of the first lens element is concave;
• the second lens element has positive refracting power, and a periphery region of the image-side surface of the second lens element is concave;
• an optical axis region of the image-side surface of the third lens element is convex;
• an optical axis region of the object-side surface of the fourth lens element is convex, and a periphery region of the image-side surface of the fourth lens element is concave;
• an optical axis region of the image-side surface of the sixth lens element is concave;
• an optical axis region of the image-side surface of the seventh lens element is concave;
• wherein lens elements included by the optical imaging lens are only the seven lens elements described above, and wherein the optical imaging lens satisfies the relationship:
• ALT/(T2+G23)≤5.000, wherein ALT is a sum of thicknesses of all the seven lens elements along the optical axis, T2 is a thickness of the second lens element along the optical axis, G23 is an air gap between the second lens element and the third lens element along the optical axis.