Lens assembly driving apparatus, photographing module and electronic device

A lens assembly driving apparatus, comprising:

• a holder having an opening;
• a metal yoke coupled with the holder, wherein the metal yoke has a through hole;
• a carrier movably disposed in the metal yoke and comprising:
• an object-side portion having an object-side central hole;
• and
• at least three inner surfaces, wherein each of the inner surfaces has a diameter, the diameters of the inner surfaces are different from each other, and each of the diameters of the inner surfaces is greater than a diameter of the object-side central hole;
• a lens assembly having an optical axis, wherein the optical axis is corresponding to the object-side central hole, the lens assembly comprises at least three lens elements, each of the lens elements has an outer diameter, the outer diameters of the lens elements are different from each other, the lens assembly is coupled in the carrier, and a movement of the lens assembly relative to the holder is according to a movement of the carrier;
• a magnet set comprising only two magnets, wherein the two magnets are opposite to each other and are fixed inside the metal yoke, and each of the two magnets comprises a concave arc structure;
• a coil surrounding and fixed at an exterior of the carrier, wherein the coil is corresponding to the two magnets;
• and
• at least one elastic element coupled with the carrier and the holder;
• wherein the concave arc structure of each of the two magnets has a concave arc center, in each of the two magnets, an included angle between two connecting lines of two ends of the concave arc structure and the concave arc center is θ, and the following condition is satisfied:
• 95 degrees<θ<175 degrees.