Lens module with enhanced stability

A lens module comprising:

• a circuit board;
• an image sensor connected to a surface of the circuit board;
• a mounting bracket defining a receiving hole, the mounting bracket being connected to the surface of the circuit board, which has the image sensor connected thereto, the image sensor received in the receiving hole of the mounting bracket;
• an optical filter connected to the mounting bracket and positioned above the image sensor;
• and
• a lens unit connected to a surface of the mounting bracket facing away from the circuit board through a hollow adhesive layer, a surface of the lens unit connected to the mounting bracket having at least two protrusions, the protrusions positioned at an inner edge of the adhesive layer, wherein a vertical height of the protrusions is greater than or equal to a vertical height of the adhesive layer,
• wherein the lens unit comprises a lens holder integrally formed with a lens, the lens holder is connected to the mounting bracket, the lens is positioned above the optical filter, the lens holder comprises a square-shaped first holding portion and a circular-shaped second holding portion, the first holding portion is connected to the mounting bracket, the second holding portion is connected to a surface of the first holding portion facing away from the mounting bracket, the adhesive layer is square and comprises four sides connected end-to-end, the protrusions number four, each protrusion is parallel to one edge of the surface of the first holding portion connected to the mounting bracket, the protrusions contacts and abuts against inner edge of the four sides of the adhesive layer.