Variable aperture module, imaging lens module and electronic device

A variable aperture module, comprising:

• a blade assembly, comprising:
• a plurality of movable blades, surrounding an optical axis and forming a light passable hole with adjustable size for different hole size states, wherein each of the plurality of movable blades has an inner surface, and the inner surfaces of the plurality of movable blades are configured to define a contour of the light passable hole in each hole size state, such that the contour of the light passable hole represents a polygon with a plurality of lines;
• a positioning element, comprising:
• a plurality of positioning structures, respectively corresponding to the plurality of movable blades;
• and
• a driving part, comprising:
• a rotation element, rotatable with respect to the positioning element, wherein the rotation element is configured to rotate the plurality of movable blades respectively with respect to the plurality of positioning structures to adjust a size of the light passable hole;
• and
• at least two rollable elements, disposed around the optical axis, wherein the rotation element, the at least two rollable elements and a substrate are arranged along a direction parallel to the optical axis, and the at least two rollable elements are disposed between the rotation element and the substrate so as to support rotation of the rotation element;
• wherein there are a plurality of matte structures disposed on each of the inner surfaces, the plurality of matte structures are regularly arranged around the optical axis, each of the plurality of matte structures is single structure extending towards the optical axis, such that of the plurality of lines represented by the contour of the light passable hole is non-linear at least in several hole size states.