Optical element drive mechanism

An optical element drive mechanism, comprising:

• an immovable part;
• a movable part connected to an optical element that has an optical axis, wherein the movable part is movable relative to the immovable part;
• a drive assembly driving the movable part to move relative to the immovable part;
• and
• a buffer assembly for absorbing vibration of the driving assembly;
• wherein the drive assembly comprises:
• a piezoelectric element comprising a piezoelectric material, wherein the piezoelectric element generates a driving force;
• a resilient element disposed on the piezoelectric element;
• a transmission element extending in a first direction, wherein the transmission element transmits the driving force;
• a contact element in direct contact with the transmission element;
• and
• a compression element for generating a compression force, so that the contact element is in contact with the transmission element, wherein the compression element has a compression-element opening corresponding to the contact element, and the contact element is received in the compression-element opening;
• wherein the movable part comprises a holder, the holder comprises a holder opening corresponding to the compression element, and the compression element is received in the holder opening,
• wherein there is a space between the holder opening and the compression element;
• wherein the buffer assembly comprises a buffer element in direct contact with the transmission element;
• wherein Young's modulus of the holder is greater than Young's modulus of the buffer element.