Patent ID: 8508859

Claim:
An image pick-up optical lens assembly, sequentially arranged from an object side to an image side along an optical axis, comprising: a first lens element with a positive refractive power, having a convex object-side surface; a second lens element with a negative refractive power; a third lens element with a positive refractive power; a fourth lens element with a positive refractive power, being a meniscus lens element, and at least one of the object-side and image-side surfaces being aspheric; a fifth lens element with a positive refractive power, having a convex object-side surface and a concave image-side surface, and at least one of the object-side and image-side surfaces being aspheric, and the image-side surface of the fifth lens element having at least one inflection point; wherein, f is the focal length of the image pick-up optical lens assembly, f 1 is the focal length of the first lens element, CT 1 is the thickness of the first lens element on the optical axis, CT 2 is the thickness of the second lens element on the optical axis, and the relation of 0.7<f/f 1 <2.0 and 0.8<CT 1 /CT 2 <2.80 are satisfied, wherein R 3 is the radius of curvature of the object-side surface of the second lens element, R 4 is the radius of curvature of the image-side surface of the second lens element, and the relation of −0.5<R 4 /R 3 <0.5 is satisfied.