Patent ID: 7903406

Claim:
A centrifugal fan comprising: an impeller including a plurality of blades arranged substantially in a circular shape around a center axis, the center axis defining an axial direction; a housing including a circumferential face that covers the circumferential contour of the impeller and a pair of wall faces arranged on both sides of the impeller in the axial direction, the circumference face and the pair of wall faces defining an inner space for housing the impeller; a motor fixed to the housing for supporting the impeller in a rotatable manner and driving the impeller to rotate when being supplied with electricity; an air outlet that is a first through hole formed in the circumferential face of the housing; an air inlet that is a second through hole formed in at least one of the pair of wall faces of the housing, at least a part of the second through hole overlapping an area in the axial direction, the area which is defined by the radially inner edges of the plurality of blades surrounding the central axis, wherein the air inlet has a substantially ring-like shape around the center axis or a shape of part of the ring-like shape; wherein the air inlet has a notch portion at an inner circumferential portion of the second through hole, the notch portion being defined by the inner circumferential portion and extending radially inwardly; and wherein at least a part of an electronic component is accommodated in a space defined by the notch portion; and the electronic component fixed to the housing for constituting an electric circuit for supplying the motor with the electricity, at least a part of the electronic component overlapping the air inlet as viewed in the axial direction.