Optical lens system for photography, image capture unit and electronic device

Abstract

Optical lens system for photography comprising four lens elements (E1, E2, E3, E4), wherein the four lens elements (E1, E2, E3, E4) are arranged in the order from an object side to an image side along a ray path as a first lens element (E1), a second lens element (E2), a third lens element (E3) and a fourth lens element (E4), and wherein each of the four lens elements (E1, E2, E3, E4) has an object-side surface facing the object side and an image-side surface facing the image side;wherein the total number of lens elements of the optical lens system for photography is four, the first lens element (E1) has a positive refractive power, the object-side surface of the first lens element (E1) is convex in a paraxial region thereof, the image-side surface of the first lens element (E1) is concave in a paraxial region thereof, the second lens element (E2) has a positive refractive power, the third lens element (E3) has a negative refractive power, the object-side surface of the third lens element (E3) is concave in a paraxial region thereof, the image-side surface of the fourth lens element (E4) is concave in a paraxial region thereof, and the image-side surface of the fourth lens element (E4) has at least one critical point (C) in an off-axis region thereof;where an axial distance between the first lens element (E1) and the second lens element (E2) is T12, an axial distance between the second lens element (E2) and the third lens element (E3) is T23, an Abbe number of the second lens element (E2) is V2, an Abbe number of the third lens element (E3) is V3, the Abbe number of the fourth lens element (E4) is V4, an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG) is TL, a maximum image height of the optical lens system for photography is ImgH, a focal length of the first lens element (E1) is f1, a focal length of the second lens element (E2) is f2, a combined focal length of the third lens element (E3) and the fourth lens element (E4) is f34, and the following conditions are met: 0.01 <T12 / T23<0,95;18,0<(V2+V3+V4) / 3<40,0;0,90<TL / ImgH<1,35;0<f1 / f2<0,90; und−1,50<f1 / f34<0.;