Imaging lens assembly, image capturing device, and electronic device

An imaging 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 with negative refractive power having an object-side surface being concave in a paraxial region thereof;
• a third lens element with positive refractive power having an object-side surface and an image-side surface being aspheric;
• and
• a fourth lens element with negative refractive power having an object-side surface and an image-side surface being aspheric;
• wherein the imaging lens assembly further comprises an aperture stop, wherein no lens element is disposed between the aperture stop and the first lens element;
• the imaging lens assembly has a total of four lens elements, there is an air gap between every two of the first lens element, the second lens element, the third lens element, and the fourth lens element that are adjacent to each other, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of an image-side surface of the second lens element is R4, a focal length of the imaging lens assembly is f, a maximum image height of the imaging lens assembly is ImgH, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, a central thickness of the second lens element is CT2, an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:
• (R3+R4)/(R3−R4)<0;
• 2.4<f/ImgH<6.5;
• −4.0<R3/T23<0;
• 0.3<T12/CT2<5.0;
• and
• 0.95<f/TL<1.5.