Patent ID: 7628582

Claim:
An air blower comprising: a case body having an air suction mouth and an outlet formed at a peripheral wall thereof; a motor which is installed into the case body, having a non-contact fluid dynamic bearing, the motor being comprised of a base fixed to the case body, a shaft having a proximal end fixed to the base and a distal end of the shaft extending from the base, a sleeve arranged around an outer circumferential part of the shaft with a minute space between the sleeve and the shaft, the sleeve being rotatable around the shaft, a rotor with an arrangement of magnets fixed to an outer circumferential part of the sleeve, a coil attached to the base elate so as to be positioned around an outer circumferential part of the rotor, a rotation member, a concave part which forms an upper part of the rotation member the concave part covering the shaft and supporting the sleeve and the rotor, a first thrust magnet fixed to the concave part; and a second thrust magnet fixed to the distal end of the shaft so as to face to the first thrust magnet; and an impeller fixed to the rotation member of the motor, the impeller comprised of a plurality of blades and a plurality of annularly shaped blade support plates provided on an upper surface and a lower surface of the impeller in such manner as to permit equalization of a pressure difference between the upper surface and the lower surface of the impeller.