Driving mechanism

A driving mechanism for moving an optical element, comprising:

• a housing;
• a base, connected to the housing;
• a quadrilateral hollow frame affixed to the housing, having a stop surface and a plurality of protrusions extending toward the base, wherein each of the protrusions has an end portion, and the end portions of the protrusions are separated from and not connected to each other;
• a holder, movably disposed in the frame for holding the optical element, wherein the stop surface faces the holder;
• a driving assembly, comprising a magnet and a coil disposed in the housing for driving the holder and the optical element to move relative to the housing along an optical axis of the optical element, wherein the stop surface is parallel to the optical axis and configured to contact and restrict the holder in a limit position;
• and
• a circuit board, electrically connected to the driving assembly and extended from a first side to a second side of the frame, wherein the coil is affixed to the holder, and the magnet is affixed to the frame and received in a depressed portion of the circuit board.