Camera module

A camera module, comprising:

• a photosensitive assembly, comprising a circuit board and a photosensitive chip electrically connected to the circuit board;
• a frame carrier assembly mounted on the photosensitive assembly, wherein the frame carrier assembly comprises a first frame carrier, a second frame carrier externally arranged on the first frame carrier and an outer frame carrier externally arranged on the second frame carrier;
• an optical camera lens held on a photosensitive path of the photosensitive assembly by being mounted in the first frame carrier, wherein the optical camera lens is provided with an optical axis;
• and
• a driving assembly, comprising a first driving element, a first prepressing component, a second driving element and a second prepressing component;
• wherein the first driving element is frictionally coupled to the first frame carrier through the first prepressing component, and is configured to, after being driven, move in a two-dimensional trajectory in a plane perpendicular to the optical axis in a manner of bending vibration along two directions, and thereby drive the first frame carrier by friction, so as to bring the optical camera lens to move in a first direction perpendicular to the optical axis;
• wherein the second driving element is frictionally coupled to the second frame carrier through the second prepressing component, and is configured to, after being driven, move in a two-dimensional trajectory in a plane perpendicular to the optical axis in a manner of bending vibration along two directions, and thereby drive the second frame carrier by friction, so as to bring the first frame carrier to bring the optical camera lens to move in a second direction perpendicular to the optical axis, the second direction being perpendicular to the first direction;
• wherein the first driving element and the second driving element are each designed as a piezoelectric actuator, and each said piezoelectric actuator comprises an actuating system and a driving circuit system, wherein the actuating system of each said piezoelectric actuator moves in a two-dimensional trajectory along a preset direction in a manner of bending vibration along two directions under the control of the respective driving circuit system;
• wherein the actuating system of each said piezoelectric actuator comprises a piezoelectric plate structure and a friction driving portion fixed to the piezoelectric plate structure, and the friction driving portion of the first driving element is frictionally coupled to the first frame carrier and the friction driving portion of the second driving element is frictionally coupled to the second frame carrier;
• and
• wherein the piezoelectric plate structure of each said piezoelectric actuator has a first side surface extending along its depth direction and a second side surface extending along its height direction and adjacent to the first side surface, wherein the piezoelectric plate structure has a first resonance frequency along its depth direction and a second resonance frequency along its height direction, and wherein the second resonance frequency is greater than the first resonance frequency.