Patent ID: 9057868
Filing Date: 2015-06-16
Classification: G02B

Abstract:
1. An optical lens system comprising an aperture stop and an optical assembly, the optical assembly comprising: in order from an object side to an image side: a first lens element with a positive refractive power having an object-side surface being convex near an optical axis, at least one of the object-side and an image-side surfaces of the first lens element being aspheric, the first lens element being made of plastic material; a second lens element with a negative refractive power having an image-side surface being concave near the optical axis, the second lens element being made of plastic material; a third lens element with a positive refractive power having an aspheric object-side surface and an aspheric image-side surface, the third lens element being made of plastic material; a fourth lens element with a positive refractive power having an object-side surface being concave near the optical axis and an image-side surface being convex near the optical axis; a fifth lens element with a negative refractive power having an aspheric object-side surface being convex near the optical axis and an aspheric image-side surface being concave near the optical axis, the fifth lens element being made of plastic material, more than one inflection point being formed on the object-side surface and the image-side surface of the fifth lens element; the aperture stop being located between the image-side surface of the first lens element and an object to be photographed; wherein a distance along an optical axis from the object-side surface of the first lens element to the image-side surface of the fifth lens element is TD, a maximum effective diameter of the image-side surface of the fifth lens element is CA52, an Abbe number of the second lens element is Vd2, an Abbe number of the third lens element is Vd3, a maximal field of view of the optical lens system is FOV, a distance from the object-side surface of the first lens element to an image plane along the optical axis is TL, a half of the maximum diagonal imaging height of the optical lens system is ImgH, and the following conditions are satisfied: 0.55<TD/CA52<0.73; 20<Vd3−Vd2<40; 80<FOV<100; 1.0<TL/ImgH<1.6.