Optical element driving mechanism

An optical element driving mechanism, comprising:

• a fixed assembly;
• a movable part, configured to be connected to an optical element and being movable relative to the fixed assembly;
• and
• a driving assembly, configured to drive the movable part to move along a first axis relative to the fixed assembly;
• wherein
• the movable assembly includes a movable part;
• the drive assembly includes a piezoelectric assembly configured to drive the movable part;
• the piezoelectric assembly is fixedly disposed on the fixed assembly, and the piezoelectric assembly includes a counterweight, a piezoelectric element and a driving member;
• the piezoelectric element is fixedly connected between the counterweight and the driving member;
• the driving member has a long strip-shaped structure extending along the first axis;
• the driving member is made of a carbon material;
• the movable assembly further includes at least two holding elements;
• the at least two holding elements and the driving member are disposed in a central opening of the movable part;
• the at least two holding elements are configured to hold the driving member;
• the at least two holding elements are made of metal;
• the piezoelectric element is configured to generate a vibration so that a friction force is generated between the driving member and the at least two holding elements to drive the movable part to move;
• the fixed assembly includes a base;
• the base has a bottom plate and a side body, and the side body is disposed on the bottom plate;
• a first inserting hole and a second inserting hole are formed on the side body;
• the optical element driving mechanism further includes a first guiding rod and a second guiding rod;
• the first guiding rod and the second guiding rod extend along the first axis;
• the first guiding rod and the second guiding rod pass through the movable part and are respectively inserted into the first inserting hole and the second inserting hole, so as to guide the movable part to move along the first axis relative to the base;
• a central notch is further formed on the side body, located between the first inserting hole and a second inserting hole;
• the base further has a positioning block disposed on the bottom plate;
• a central through hole is formed on the positioning block, corresponding to the central notch;
• the piezoelectric assembly is configured to pass through the central through hole and the movable part and then to be disposed in the central notch;
• and
• the piezoelectric assembly is configured to drive the movable part to move between the side body and the positioning block.