Patent ID: 8717685

Claim:
An optical image 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; a third lens element with positive refractive power; a fourth lens element; a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface, at least one of an object-side surface and the image-side surface thereof being aspheric, and the fifth lens element is made of plastic; and a sixth lens element with negative refractive power having a concave image-side surface, at least one of an object-side surface and the image-side surface thereof being aspheric, the sixth lens element is made of plastic, and the shape of the image-side surface changes from concave at the paraxial region thereof to convex while away from the paraxial region thereof; wherein a focal length of the third lens element is f3, a focal length of the first lens element is f1, a focal length of the fifth lens element is f5, and they satisfy the following relations: 0 <f 3 /f 1<2.5; and 0 <f 5 /f 3<4.0.