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

Abstract

Optical lens assembly for photography, comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8), in order from an object side to an image side along a ray path, are 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), a seventh lens element (E7) and an eighth lens element (E8), wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a positive refractive power, the object-side surface of the first lens element (E1) in a paraxial region of which it is convex, the sixth lens element (E6) has a positive refractive power,the eighth lens element (E8) has a negative refractive power and the object-side surface of the eighth lens element (E8) has at least one inflection point (P); and where f is the focal length of the optical lens assembly for photography, R15 is the radius of curvature of the object-side surface of the eighth lens element (E8), T12 is the axial distance between the first lens element (E1) and the second lens element (E2), T34 is the axial distance between the third lens element (E3) and the fourth lens element (E4), T45 is the axial distance between the fourth lens element (E4) and the fifth lens element (E5), T56 is the axial distance between the fifth lens element (E5) and the sixth lens element (E6), T67 is the axial distance between the sixth lens element (E6) and the seventh lens element (E7), CT3 is the central thickness of the third lens element (E3), and CT4 is the central thickness of the fourth lens element (E4).an axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the eighth lens element (E8) TD, an entrance pupil diameter of the optical lens assembly for photography EPD, an Abbe number of the second lens element (E2) V2, an Abbe number of the seventh lens element (E7) V7, an Abbe number of the eighth lens element (E8) V8, and the following conditions are met: −5.00 <f / R15<0,50;0,20<(T12+T34+T45+T56+T67) / CT3<1,20;0,20<(T12+T34+T45+T56+T67) / CT4<1,70;2,00<TD / EPD<2,80; und−8,0<V2+V7−V8<40,0.,