Voice coil motor

A voice coil motor comprising:

• a stationary magnetic field generator defining a receiving space;
• a moveable magnetic field generator received in the receiving space and comprising a lens retainer and coils wrapping around the lens retainer, the lens retainer defining a circular hole, the lens retainer having internal threads formed on an internal wall of the circular hole;
• a lens module partially received in the circular hole and forming external threads threadedly engaging with the internal threads;
• a adhesive coated between the external and internal threads;
• a base, the stationary magnetic field generator supported on the base, the base defining an opening in the center of the base;
• and
• a lower elastic plate sandwiched between the base and the stationary magnetic field generator, the lower elastic plate defining a light passing hole aligned with the opening of the base, the lower elastic plate comprising an elastic portion surrounding the light passing hole, a cross-sectional area of the elastic portion perpendicular to an optical axial direction of the voice coil motor is less than a cross-sectional area of the opening of the base perpendicular to the optical axial direction of the voice coil motor.