Panasonic Intellectual Property Management Co., Ltd.

Munetada Satou

Masayuki Takada

Seiji Shirahama

Satoru Murao

Kazuhiro Muromachi

Motohiro Morishita

Ryutaro Ishida

A cylindrically-shaped motor shaft forming a rotational axis of a motor includes a processing target region, a spiral groove, and a reverse spiral groove intersecting with the spiral groove at at least one point. The processing target region has a first end closer to a bottom face of the cylindrical shape and second end closer to a top face side of the cylindrical shape. At least one turn of the spiral groove surrounds an outer circumferential surface in the processing target region. The reverse spiral groove surrounds the outer circumferential surface in the processing target region in a direction reverse to that of the spiral groove.

Motor shaft, rotor, motor and blower

An air blowing device includes a housing with a suction port and a blow-off port, and a fan placed in the housing. The fan includes a fan case with a tongue section, an impeller, and a motor. The fan case includes an inlet and an outlet, and is shaped such that a space between the impeller and an inner wall of the fan case increases along a rotary direction of the impeller up to a cross section cut along a line between the tongue section and its opposite section. An opening area of the fan case at the tongue section is kept equal or decreases up to the outlet.

Air blowing device

Growing community of inventors

Aichi, Japan

Munetada Satou