Patent ID: 7474032

Claim:
A simplified fan device having a thin-type structure, comprising: a base plate including an axial hole and at least two stator coils; a shaft member having a first distal end and a second distal end arranged in opposite directions; a flat-type impeller formed with an annular supporting plate, an assembling hole and a plurality of bent vanes; and a magnet sheet providing with a center through hole and at least one pair of alternatively opposite magnetic poles axially aligning with the stator coil; wherein the first distal end of the shaft member is mounted to one of the assembling hole of the flat-type impeller and the center through hole of the magnet sheet while the second distal end of the shaft member is extended through and rotatably received in a bearing member mounted in the axial hole of the base plate so as to constitute the thin-type structure; and wherein a minimum air gap is formed between the stator coils and the magnet sheet relative to an axis of the fan device such that the minimum air gap so formed between the stator coils and the magnet sheet occupies a minimum length of an axial thickness of the fan device.