Imaging lens assembly

An imaging lens assembly, sequentially comprising, from an object side to an image side along an optical axis:

• a movable diaphragm,
• a first lens with a positive refractive power,
• a second lens with a refractive power,
• a third lens with a refractive power,
• a fourth lens with a positive refractive power and
• a fifth lens with a refractive power,
• wherein TSmin, a distance from the movable diaphragm at a minimum distance from an imaging surface of the imaging lens assembly to an object-side surface of the first lens on the optical axis, TSmax, a distance from the movable diaphragm at a maximum distance from the imaging surface of the imaging lens assembly to the object-side surface of the first lens on the optical axis and CT1, a center thickness of the first lens on the optical axis meet 1.0<(|TSmin|+|TSmax|)/CT1<1.5;
• and
• SAG41, a distance from an intersection point of an object-side surface of the fourth lens and the optical axis to a maximum effective radius vertex of the object-side surface of the fourth lens on the optical axis, SAG42, a distance from an intersection point of an image-side surface of the fourth lens and the optical axis to a maximum effective radius vertex of the image-side surface of the fourth lens on the optical axis and DT42, a maximum effective radius of the image-side surface of the fourth lens meet 0.7<(SAG41+SAG42)/DT42<1.0.