Lens module

1. A lens module, comprising:

a base having a bottom portion and an extension portion extending vertically along the bottom portion, with a stepped surface formed where the bottom portion connects with the extension portion, and an internal thread formed on an inner wall of the extension portion;

an elastic element disposed on the stepped surface;

an optical lens;

an abutting member configured to be received in the extension portion of the base, disposed between the optical lens and the stepped surface, and fixed to the stepped surface; and

a receiving element configured to receive the optical lens and comprising a threaded portion and a receiving portion connected with the threaded portion, the threaded portion comprising an external thread matching with the internal thread and connectable with the internal thread by threading to connect the receiving element with the base, wherein the elastic element abuts against the threaded portion to provide a pretightening force for the receiving element.

2. The lens module according to claim 1 , wherein a sum of the height of the threaded portion along a direction perpendicular to the stepped surface and the height of the elastic element along the direction perpendicular to the stepped surface is greater than the height of the extension portion along the direction of the stepped surface.

3. The lens module according to claim 1 , wherein both the bottom portion and the extension portion are ring-like, and the extension portion and the bottom portion are integrally formed.

4. The lens module according to claim 1 , wherein the height of the abutting member along a direction perpendicular to the stepped surface is equal to a distance from the optical lens to the stepped surface, and a top surface of the abutting member away from the stepped surface abuts against the optical lens.

5. The lens module according to claim 1 , further comprising:

multiple bolts, wherein the bottom portion of the base comprises multiple threaded holes, each of the holes corresponding to one of the bolts; and

an outer wall of the abutting member comprising multiple threaded studs at positions corresponding to positions of the multiple threaded holes, wherein the multiple threaded bolts are connected with a respective one of the threaded studs by threading to fix the abutting member to the stepped surface.

6. The lens module according to claim 5 , wherein two sides of each of the threaded holes comprise a positioning column respectively, and each of the threaded studs is located between two of the positioning columns.

7. The lens module according to claim 1 , wherein the abutting member is fixed onto the stepped surface by glue.

8. The lens module according to claim 1 , wherein an inner wall of the abutting member comprises an inclined face, the diameter of the inclined face gradually decreasing from one end away from the stepped surface to the other end close to the stepped surface, the inclined face comprising multiple decorative steps.

9. The lens module according to claim 8 , wherein:

the bottom portion of the base comprises a circular first opening;

the abutting member comprises a hollow ring-like structure having a circular second opening, wherein the diameter of the second opening is less than that of the first opening;

the diameter of one end of the inclined face away from the stepped surface is greater than the diameter of the second opening and the diameter of the first opening, but is less than the inner diameter of the extension portion; and

the diameter of one end of the inclined face close to the stepped surface is less than the diameter of the second opening and the diameter of the first opening.

10. The lens module according to claim 1 , wherein the elastic element abuts against the inner wall of the extension portion.

11. The lens module according to claim 1 , wherein the elastic element is made of rubber.

12. The lens module according to claim 1 , wherein one end of the receiving portion away from the threaded portion is provided with an opening, one end of the receiving portion close to the opening comprising a first receiving groove, the first receiving groove configured to receive the optical lens.

13. The lens module according to claim 12 , wherein:

the end of the receiving portion close to the opening is further provided with a second receiving groove;

the first receiving groove is in communication with the second receiving groove; and

the lens module further comprises a gasket received in the second receiving groove and abutting against the optical lens.

14. The lens module according to claim 13 , wherein the thickness of the optical lens is equal to the depth of the first receiving groove, and the thickness of the gasket is equal to the depth of the second receiving groove.

15. The lens module according to claim 13 , wherein the gasket is made of a metal material and is provided with a notch.

16. The lens module according to claim 1 , wherein the optical lens is a filter.

17. The lens module according to claim 1 , wherein the lens module is disposed on an unmanned aerial vehicle.