Patent ID: 8179614

Claim:
An image pickup optical lens assembly, sequentially arranged from an object side to an image side, comprising: a first lens element with positive refractive power, having a convex object-side surface; a second lens element with negative refractive power, having a concave object-side surface and a convex image-side surface; a third lens element with refractive power; a fourth lens element with positive refractive power, having a concave object-side surface and a convex image-side surface; and a fifth lens element with negative refractive power, having a concave image-side surface, and both object-side surface and image-side surface being aspheric, and the image-side surface of the fifth lens element having at least one inflection point; wherein, R 3 is a curvature radius of the object-side surface of the second lens element, R 4 is a curvature radius of the image-side surface of the second lens element, T 34 is an axial distance between the third lens element and the fourth lens element, T 45 is an axial distance between the fourth lens element and the fifth lens element, N 1 is a refractive index of the first lens element, N 2 is a refractive index of the second lens element, and the following relations are satisfied: −6.0<( R 3 +R 4 )/( R 3 −R 4 )<−1.0; 0.3< T 34 /T 45 <2.5; −0.25< N 1 −N 2 0.