a lens barrel defining a through hole;

a plurality of optical lenses disposed in the through hole; and

a focusing member disposed between adjacent two of the plurality of optical lenses;

wherein the focusing member comprises a bottom plate, a cover plate, a piezoelectric element,

a variable transparent body, and a conductive plate, the variable transparent body is disposed between the bottom plate and the cover plate, the piezoelectric element is disposed on a surface of the cover plate facing away from the variable transparent body, the piezoelectric element is staggered from the variable transparent body, so that when an electric voltage is applied to the piezoelectric element, an end of variable transparent body start to deform firstly, the conductive plate is connected to the piezoelectric element, the conductive plate defines an aperture, the bottom plate, the cover plate, and the variable transparent body are disposed in the aperture, the conductive plate and the lens barrel are integrally formed.