Patent ID: 8537472

Claim:
A photographing optical lens system comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with positive refractive power having a convex image-side surface; and a fifth lens element with refractive power having a concave image-side surface, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric, and the fifth lens element has at least one inflection point formed on at least one of the object-side surface and the image-side surface thereof; wherein an axial distance between the first lens element and the second lens element is T 12 , an axial distance between the second lens element and the third lens element is T 23 , an axial distance between the third lens element and the fourth lens element is T 34 , a focal length of the photographing optical lens system is f, a focal length of the fourth lens element is f 4 , and the following relationships are satisfied: 1.2<( T 12/ f )×10<5.0; 0.0<( T 23+ T 34)/ T 12<1.0; and 0.3< f/f 4<3.5.