Imaging lens assembly

An imaging lens assembly, comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side of the imaging lens assembly to an image side of the imaging lens assembly in turn, wherein

• the first lens is of a positive focal power, an object side surface of the first lens is convex;
• the second lens is of a negative focal power, an image side surface of the second lens is concave;
• the third lens is of a focal power;
• the fourth lens is of a focal power;
• and
• the fifth lens is of a negative focal power;
• a combined focal power of the third lens and the fourth lens is negative;
• the imaging lens assembly meets the following formulas:
• 2.0<f/ImgH<3.0;
• and
• 0<f1/f<0.5,
• wherein f represents an effective focal length of the imaging lens assembly,
• ImgH equals to a half-length of a diagonal of an effective pixel region at an imaging side surface of the imaging lens assembly, and
• f1 represents an effective focal length of the first lens.