Patent ID: 8817385

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; a second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with negative refractive power made of plastic material, and having a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface of the fourth lens lement is aspheric; and a fifth lens element with negative refractive power made of plastic material, and having a concave object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric, and the image-side surface of the fifth lens element changes from concave at the paraxial region to convex at the peripheral region; wherein the photographing optical lens system has a total of five lens elements with refractive power, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, a focal length of the photographing optical lens system is f, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and the following relationships are satisfied: −10 <R 9 /R 10<0; −2.8<( f/f 4)+( f/f 5)<−0.85; and −1.1< f/f 4<0.