Photographing lens module and electronic device

1. A photographing lens module, 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 strip rib structures, wherein each of the strip rib structures has a strip shape along a radial direction of an optical axis of the plastic lens element, and the strip rib structures are arranged around the effective optical portion;

a plurality of light absorbing coatings coated on the strip rib structures respectively; and

at least one annular rib structure surrounding the effective optical portion and intersecting with the strip rib structures.

2. The photographing lens module of claim 1 , wherein the light absorbing coatings are made of black resin materials.

3. The photographing lens module of claim 1 , wherein the strip rib structures are arranged as a plurality of stepped shapes along a circumferential direction of the plastic lens element.

4. The photographing lens module of claim 1 , wherein a width of each of the strip rib structures is w, and the following condition is satisfied:

0.01 mm< w <0.12 mm.

5. The photographing lens module of claim 1 , wherein a number of the strip rib structures is n, and the following condition is satisfied:

90< n< 720.

6. The photographing lens module of claim 1 , wherein the light absorbing coatings are connected to each other for forming an annular shape.

7. The photographing lens module of claim 1 , wherein a number of the annular rib structure is at least two, and the annular rib structures and the strip rib structures are formed as a woven pattern.

8. The photographing lens module of claim 1 , wherein the annular rib structure is coated with the light absorbing coatings.

9. The photographing lens module of claim 1 , wherein a width of the annular rib structure is t, and the following condition is satisfied:

0.01 mm< t <0.12 mm.

10. The photographing lens module of claim 1 , wherein a number of the lens elements of the photographing lens module is at least four.

11. The photographing lens module of claim 10 , wherein the surface of the plastic lens element is the object-side surface and further comprises:

an object-side abutting area, wherein the strip rib structures are farther from the effective optical portion than the object-side abutting area from the effective optical portion.

12. The photographing lens module of claim 1 , wherein the light absorbing coatings are coated by a needle.

13. The photographing lens module of claim 1 , wherein at least one surface of each of the strip rib structures comprises a light diminishing surface.

14. The photographing lens module of claim 13 , wherein a surface roughness of the light diminishing surface is Ra, and the following condition is satisfied:

0.1 μm< Ra.

15. The photographing lens module of claim 1 , wherein the effective optical portion has a wavy shape.

16. The photographing lens module of claim 1 , wherein the plastic lens element is the fourth lens element of the photographing lens module in order from an object side to an image side.

17. An electronic device, comprising:

the photographing lens module of claim 1 .