Image capturing optical lens assembly, image capturing device and mobile terminal

An image capturing optical lens assembly comprising, in order from an object side to an image side:

• a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof;
• a second lens element having negative refractive power;
• a third lens element having refractive power;
• a fourth lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave or planar in a paraxial region thereof, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric, and at least one of the object-side surface and the image-side surface of the fourth lens element has at least one inflection point thereon;
• and
• a fifth lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the object-side surface and the image-side surface of the fifth lens element are aspheric, and the image-side surface of the fifth lens element has at least one convex shape in an off-axial region thereon;
• wherein the image capturing optical lens assembly has a total of five lens elements with refractive power, there is an air gap in a paraxial region between any two of the first lens element, the second lens element, the third lens element, the fourth lens element, and the fifth lens element that are adjacent to each other, a focal length of the image capturing optical lens assembly is f, a focal length of the fourth lens element is f4, a curvature radius of the image-side surface of the fourth lens element is R8, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, an axial distance between the fourth lens element and the fifth lens element is T45, a central thickness of the fifth lens element is CT5, and the following conditions are satisfied:
• 1.20<(f/R10)−(f/R9);
• 0≦f4/R8;
• 0.4<f/f4;
• and
• 1.1<T45/CT5.