Patent ID: 8405755
Filing Date: 2013-03-26
Classification: G02B

Abstract:
1. A photographing optical lens assembly 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 having a concave object-side surface and a convex image-side surface; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; and a fourth lens element having a convex object-side surface and a concave image-side surface, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric; wherein a radius of curvature of the object-side surface of the second lens element is R3, a radius of curvature of the image-side surface of the second lens element is R4, a radius of curvature of the object-side surface of the first lens element is R1, and a radius of curvature of the image-side surface of the first lens element is R2; the photographing optical lens assembly further comprises an aperture stop, wherein a distance on the optical axis between the aperture stop and the image plane is SL, a distance on the optical axis between the object-side surface of the first lens element and the image plane is TTL, and they satisfy the following relationships: