Optical lens assembly for photography, image acquisition unit and electronic device

Abstract

Optical lens assembly for photography comprising seven lens elements (E1, E2, E3, E4, E5, E6 and E7), wherein the seven lens elements (E1, E2, E3, E4, E5, E6 and E7) 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), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6) and a seventh lens element (E7), and each of the seven lens elements (E1, E2, E3, E4, E5, E6 and E7) has an object-side surface facing towards the object side and an image-side surface facing towards the image side;wherein the first lens element (E1) has a negative refractive power, the object-side surface of the first lens element (E1) is concave in a paraxial region thereof, the object-side surface of the first lens element (E1) has at least one inflection point (P), the third lens element (E3) has a positive refractive power, the fourth lens element (E4) has a negative refractive power, the sixth lens element (E6) has a positive refractive power, the object-side surface of the seventh lens element (E7) is convex in a paraxial region thereof, and the image-side surface of the seventh lens element (E7) is concave in a paraxial region thereof;and where the focal length of the first lens element (E1) is f1, the focal length of the seventh lens element (E7) is f7, the radius of curvature of the object-side surface of the first lens element (E1) is R1, the radius of curvature of the image-side surface of the fourth lens element (E4) is R8, the radius of curvature of the object-side surface of the sixth lens element (E6) is R11, the radius of curvature of the image-side surface of the sixth lens element (E6) is R12, the central thickness of the first lens element (E1) is CT1, the axial distance between the fourth lens element (E4) and the fifth lens element (E5) is T45, and the following conditions are met: |f1 / f7| < 2.00; |R1 / R8| < 0.80; 0.20 <CT1 / T45<2,80;und−2,50<(R11+R12) / (R11−R12)<1,20.;