Plastic lens barrel, camera module and electronic device

A plastic lens barrel, having an inner space for accommodating an imaging lens assembly, the imaging lens assembly having an optical axis, the plastic lens barrel comprising:

• an object-side portion located close to an object side of the plastic lens barrel, wherein the object-side portion comprises an object-side opening and an object-side annular surface, and the object-side annular surface surrounds the object-side opening and faces toward the object side;
• an image-side portion located close to an image side of the plastic lens barrel and comprising an image-side opening;
• and
• a tube-shaped portion surrounding the optical axis, wherein the tube-shaped portion is connected between the object-side portion and the image-side portion, and configured to define the inner space;
• wherein the object-side annular surface comprises a groove structure area, the groove structure area comprises a plurality of groove structures, and the groove structures are disposed in at least one of an arranging manner and an extending manner along a sagittal direction away from the optical axis;
• wherein a maximum outer diameter of the groove structure area is φo, a maximum outer diameter of the plastic lens barrel is φmax, a minimum inner diameter of the groove structure area is φi, a diameter of the object-side opening of the plastic lens barrel is φmin, and the following conditions are satisfied:
• 0.2<φo/φmax<0.9;
• and
• 0.75<φmin/φi≤1.0.