Patent ID: 7121807

Claim:
An axial-flow fan having a central hub coupled to a rotational shaft of a motor, a plurality of blades extending radially outwardly from the outer circumference of the hub for blowing air in an axial direction, the plurality of blades being integrated with the hub into a single body, each of the plurality of blades having a leading edge line (L.E.L.) and a trailing edge line (T.E.L.) that are formed in a corrugated shape along almost the same direction to each other and have at least two or more pairs of inflection points formed along the lines, wherein the inflection points of the trailing edge line (T.E.L.) formed on each of the plurality of blades are placed in such a manner as to be closer to a blade tip than those of the leading edge line (L.E.L.) formed on each of the plurality of blades.