Imaging lens, and electronic apparatus including the same

An imaging lens 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 arranged in order from an object side to an image side along an optical axis of said imaging lens, each of said first lens element, said second lens element, said third lens element, said fourth lens element, said fifth lens element and said sixth lens element having a refractive power, an object-side surface facing toward the object side, and an image-side surface facing toward the image side, wherein:

• said first lens element has a positive refractive power;
• said second lens element has a negative refractive power, said object-side surface of said second lens element has a convex portion in a vicinity of the optical axis and an outermost portion of said object-side surface of said second lens element for passage of imaging light is a concave portion, and an outermost portion of said image-side surface of said second lens element for passage of imaging light is a concave portion;
• said image-side surface of said third lens element has a convex portion in a vicinity of the optical axis;
• said fourth lens element has a negative refractive power, said object-side surface of said fourth lens element has a concave portion in a vicinity of the optical axis;
• an outermost portion of said image-side surface of said fifth lens element for passage of imaging light is a convex portion;
• said image-side surface of said sixth lens element has a concave portion in a vicinity of the optical axis and an outermost portion of said image-side surface of said sixth lens element for passage of imaging light is a convex portion;
• and
• said imaging lens does not include any lens element with a refractive power other than said first lens element, said second lens element, said third lens element, said fourth lens element, said fifth lens element and said sixth lens element, satisfying (G23+G56)/(G12+G45)≦3.80 and 9≧EFL/T3≧5.50, where G12 represents an air gap length between said first lens element and said second lens element at the optical axis, G23 represents an air gap length between said second lens element and said third lens element at the optical axis, G45 represents an air gap length between said fourth lens element and said fifth lens element at the optical axis, G56 represents an air gap length between said fifth lens element and said sixth lens element at the optical axis, EFL represents a system focal length of said imaging lens, and T3 represents a thickness of said third lens element at the optical axis.