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, and a fifth lens element, each 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, the optical imaging lens comprising:
• a periphery region of the image-side surface of the first lens element is concave;
• 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 object-side surface of the third lens element is convex;
• and
• an optical axis region of the object-side surface of the fifth lens element is concave;
• lens elements of the optical imaging lens are only the above-mentioned five lens elements;
• EFL is an effective focal length of the optical imaging lens, Fno is the f-number of the optical imaging lens, HFOV stands for the half field of view of the optical imaging lens, T5 is a thickness of the fifth lens element along the optical axis, G12 is an air gap between the first lens element and 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, G34 is an air gap between the third lens element and the fourth lens element along the optical axis and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis, and the optical imaging lens satisfies the relationship:
• EFL*Fno/HFOV≥3.500 mm/degree and (G12+G23+G34)/(G45+T5)≥2.500.

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, and a fifth lens element, each 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, the optical imaging lens comprising:
• a periphery region of the image-side surface of the first lens element is concave;
• a periphery region of the object-side surface of the second lens element is convex;
• an optical axis region of the image-side surface of the third lens element is concave;
• and
• the fifth lens element has negative refracting power and an optical axis region of the object-side surface of the fifth lens element is concave;
• lens elements of the optical imaging lens are only the above-mentioned five lens elements;
• EFL is an effective focal length of the optical imaging lens, AAG is a sum of four air gaps from the first lens element to the fifth lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis and G34 is an air gap between the third lens element and the fourth lens element along the optical axis, and the optical imaging lens satisfies the relationship:
• EFL/AAG≥4.500 and the largest air gap along the optical axis is G12 or G34.