Photographing module and electronic device

1. A photographing module, comprising:

an imaging lens assembly comprising a plurality of lens elements, wherein one of the lens elements is a plastic lens element, and at least one surface of an object-side surface and an image-side surface of the plastic lens element comprises:

an effective optical portion being aspheric; and

a peripheral portion surrounding the effective optical portion and comprising:

a plurality of rib structures, wherein each of the rib structures has a strip shape along a radial direction of an optical axis of the imaging lens assembly and is inclined relative to the optical axis, two of the rib structures in one of the radial directions separately face each other, and the strip shapes of the rib structures are arranged around the effective optical portion; and

a first fitting section surrounding the effective optical portion and connected to another one of the lens elements adjacent to the surface for aligning the plastic lens element with the lens element adjacent to the surface;

wherein the strip shapes and the first fitting section are arranged in order along the radial directions, and each of the strip shapes is parallel with one of the radial directions.

2. The photographing module of claim 1 , wherein the imaging lens assembly further comprises:

a light blocking sheet disposed between the plastic lens element and the lens element adjacent to the surface.

3. The photographing module of claim 2 , wherein a thickness of the light blocking sheet is t, and the following condition is satisfied:

0.005 mm<t<0.05 mm.

4. The photographing module of claim 1 , wherein a number of the lens elements of the imaging lens assembly is N, and the following condition is satisfied:

4≤N.

5. The photographing module of claim 4 , wherein the number of the lens elements of the imaging lens assembly is N, and the following condition is satisfied:

5≤N.

6. The photographing module of claim 5 , wherein the number of the lens elements of the imaging lens assembly is N, and the following condition is satisfied:

5≤N<10.

7. The photographing module of claim 1 , wherein an Abbe number of the plastic lens element is V, and the following condition is satisfied:

10<V<25.

8. The photographing module of claim 1 , wherein the strip shapes are closer to the effective optical portion being aspheric than the first fitting section is to the effective optical portion.

9. The photographing module of claim 1 , wherein a greatest width of each of the strip shapes is w, and the following condition is satisfied:

0.01 mm<w<0.10 mm.

10. The photographing module of claim 1 , wherein the other surface of the object-side surface and the image-side surface of the plastic lens element comprises:

a second fitting section connected to another one of the lens elements adjacent to the other surface for aligning the plastic lens element with the lens element adjacent to the other surface.

11. The photographing module of claim 1 , wherein an angle between the first fitting section and the optical axis of the imaging lens assembly is 0, and the following condition is satisfied:

5 degrees<θ<35 degrees.

12. An electronic device, comprising:

the photographing module of claim 1 .