Lens driving device with an improved ois coil structure

A lens driving device, comprising:

• a lens assembly having an optical axis;
• an auto-focusing coil disposed around an outer surrounding of the lens assembly with respect to the optical axis;
• an OIS coil set including a plurality of OIS coils disposed on a plane perpendicular to the optical axis, wherein at least one of the OIS coils has a smaller size than the opposing OIS coil;
• a plurality of magnets disposed around the outer surrounding of the lens assembly with respect to the optical axis, wherein each of the magnets has a first surface facing the auto-focusing coil and a second surface facing one of the OIS coils respectively;
• and
• at least one magnetic induction element placed beside the smaller-size OIS coil to sense a magnetic signal due to a displacement of the magnets;
• wherein the auto-focusing coil interacts with each of the magnets along the first surface direction to drive the lens assembly and the auto-focusing coil moving together along the optical axis with respect to the magnets upon an AF electric current passing the auto-focusing coil;
• wherein one of the OIS coils interacts with the second surface of the magnet correspondingly with a direction the same with the opposing OIS coil interacting with the second surface of the magnet correspondingly to drive the lens assembly, the auto-focusing coil and the magnets moving together along a direction perpendicular to the optical axis upon an OIS electric current passing the OIS coils.