Patent ID: 7764878

Claim:
An auto-focusing camera comprising: a plurality of drive units stacked on each other, each drive unit comprising: a lens mount; a lens unit received in the lens mount; a permanent magnet being fixedly mounted around the lens unit to move with the lens unit; a first coil seat arranged on a first side of the magnet with a first coil wound thereon and a second coil seat arranged on a second side opposite to the first side of the magnet with a second coil wound thereon, each coil establishing a magnetic field when an electric current is applied to the each coil, the magnetic fields of the first and second coils interacting with the magnetic field of the magnet to drive the lens unit into movement between its front focal point and its rear focal point; and first and second yokes each having a plurality of claws extending perpendicularly therefrom; wherein each coil seat comprises a cylinder and a flange extending outwardly from a side of the cylinder near the magnet, the cylinder of each coil seat defining a plurality of grooves in an inner circumferential surface thereof receiving the claws of one corresponding yoke therein.