Camera module

1. A camera module comprising:

a lens module comprising a lens barrel and at least one lens received in the lens barrel;

a lens holder comprising a hollow main body and a bottom base connected to the main body, the main body being connected to the lens barrel, the bottom base defining a receiving cavity, a sidewall of the bottom base defining at least one mounting hole close to the main body and communicating with the receiving cavity;

a filter positioned on the bottom base and received in the receiving cavity, the at least one mounting hole being configured for allowing the filter to be inserted into the receiving cavity or allowing the filter to be taken out of the receiving cavity;

a circuit board positioned on the bottom base; and

an image sensor received in the receiving cavity and electrically connected to the circuit board;

wherein the bottom base comprises an inner top surface facing to the receiving cavity and close to the hollow main body, the at least one mounting hole is close to the inner top surface, and the filter is positioned on the inner top surface; and

wherein the at least one mounting hole comprises two opposite mounting holes, the filter is aligned with the two mounting holes.

2. The camera module of claim 1 , wherein the lens barrel defines a plurality of outer threads in an outer surface thereof, the main body defines a plurality of inner threads in an inner wall thereof, the outer threads are engaged with the inner threads.

3. The camera module of claim 1 , wherein the at least one mounting hole is sealed with bond materials.