Patent ID: 7862309

Claim:
A thin fan structure comprising: a driving unit having a base, a coil circuit board disposed on the base and a fixed shaft; and a rotating unit having a bearing, a fan blade, a magnet and an iron-containing metal sheet, wherein the bearing has an outer ring and an inner ring, the fan blade, the magnet and the iron-containing metal sheet are fixed at the outer ring of the bearing, the inner ring of the bearing is fixed at the shaft of the driving unit and the coil circuit board of the driving unit may drive the rotating unit to turn around, the fan blade having a cavity containing the iron-containing metal sheet and the magnet so as to be effectively integrated and reducing an axial thickness; the fan blade, the magnet and the iron-containing metal sheet each having a surface simultaneously engaging and being in direct contact with the outer ring of the bearing to increase contact area with the bearing and raise mechanical strength.