Patent ID: 8773782

Claim:
An optical lens assembly with a filter member for image taking, sequentially arranged from an object side to an image side comprising: a filter member, wherein the filter member comprises a blue glass that can absorb infrared light, and wherein transmittance of an incident light with wavelengths of 750 nm˜1000 nm through the filter member is smaller than 20%; and a lens assembly, disposed at an image side of the filter member; comprising four lens elements with refractive power, sequentially arranged from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface; a third lens element having a concave object-side surface and a convex image-side surface; and a fourth lens element having a concave image-side surface, and at least one of the object-side surface and the image-side surface thereof has at least one inflection point; wherein at least two of the four lens elements with refractive power are made of plastic with at least one aspheric object-side surface or image-side surface; wherein the optical lens assembly with a filter member for image taking further comprises an image sensor at an image plane; and wherein TTL is an axial distance from the object-side surface of the first lens element to the image plane, ImgH is a half of the diagonal length of an effective photosensitive area of the image sensor, and the following relation is satisfied: TTL /Img H< 2.10.