Optical element driving mechanism with piezoelectric driving assembly

An optical element driving mechanism, comprising:

• a fixed portion;
• a movable portion connected to an optical assembly;
• and
• a driving assembly driving the movable portion to move relative to the fixed portion;
• wherein the driving assembly comprises a piezoelectric element;
• wherein the piezoelectric element comprises:
• a piezoelectric unit;
• a guiding element, wherein a first end of the guiding element is connected to the piezoelectric unit, and a second end is connected to the fixed portion;
• and
• a counterweight element connected to the piezoelectric unit, wherein the piezoelectric unit is disposed between the guiding element and the counterweight element;
• wherein the fixed portion comprises a bottom, wherein the bottom has:
• a first through hole, corresponding to the piezoelectric unit and the counterweight element, accommodating a part of the piezoelectric unit and the counterweight element, and substantially having a rectangular profile;
• and
• a second through hole, corresponding to the guiding element, accommodating the second end of the guiding element, and substantially having a circular profile.