Optical photography system, image capture unit and electronic device

Abstract

Optical photography system comprising six lens elements (E1, E2, E3, E4, E5, E6), wherein the six lens elements (E1, E2, E3, E4, E5, E6) 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) and a sixth lens element (E6), and wherein each of the six lens elements (E1, E2, E3, E4, E5, E6) 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 negative refractive power, the second lens element (E2) has a positive refractive power, the third lens element (E3) has a positive refractive power, the fourth lens element (E4) has a negative refractive power, the object-side surface of the sixth lens element (E6) is convex in a paraxial region thereof, the image-side surface of the sixth lens element (E6) is concave in a paraxial region thereof, at least one of the object-side surfaces and the image-side surface of the fourth lens element (E4) has at least one inflection point (P), the object-side surface of the sixth lens element (E6) has at least one inflection point (P), and the image-side surface of the sixth lens element (E6) has at least one critical point (C) in an off-axis region thereof;where a central thickness of the first lens element (E1) is CT1, a central thickness of the second lens element (E2) is CT2, a central thickness of the third lens element (E3) is CT3, a central thickness of the fourth lens element (E4) is CT4, the central thickness of the fifth lens element (E5) is CT5, an axial distance between the fourth lens element (E4) and the fifth lens element (E5) is T45, an axial distance between the fifth lens element (E5) and the sixth lens element (E6) is T56, a focal length of the optical photography system is f, half of a maximum field of view of the optical photography system is HFOV, a combined focal length of the second lens element (E2) and the third lens element (E3) is f23, and the following conditions are met: 1.20 < (CT1 + CT2) / (CT3 + CT4) < 2.00; 0.10 <CT5 / (T45+T56)<0,45;und0,50<f×tan(HFOV) / f23<2,50.;