Optical imaging lens assembly, image capturing unit and electronic device

An optical imaging lens assembly comprising five lens elements, the five lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element, and each of the five lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;

• wherein the first lens element has positive refractive power, the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the second lens element is concave in a paraxial region thereof, the object-side surface of the third lens element is concave in a paraxial region thereof, the fourth lens element has positive refractive power, the object-side surface of the fourth lens element is convex in a paraxial region thereof, the image-side surface of the fourth lens element is concave in a paraxial region thereof, the object-side surface of the fifth lens element is convex in a paraxial region thereof, and at least one surface of at least one lens element in the optical imaging lens assembly has at least one critical point in an off-axis region thereof;
• wherein a curvature radius of the image-side surface of the first lens element is R2, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the object-side surface of the third lens element is R5, a central thickness of the third lens element is CT3, and the following conditions are satisfied:
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