| 摘要 |
PURPOSE:To make the winding of a fan unnecessary and reduce the size as well as the weight of the fan by a method wherein the fan is provided with an annular supporting member, provided around the outer periphery of the fan to support the fan and rotated integrally with the fan, and an ultrasonic motor, welded to the supporting member by pressure and rotating the supporting member. CONSTITUTION:Ultrasonic oscillators 11 are embedded into the case 36 of the main body of a fan 31 and are welded by pressure to a circular ring 34 through retaining members 35 while blades 33 are supported from the circular ring 34 toward the central part of the fan and a hub 32 is fixed by supporting rods at the central part of the fan. The ultrasonic oscillators 11 form driving units 37a, 37b at both end units where the maximum oscillation can be obtained. According to this method, the winding of the fan may be made unnecessary and the size as well as the weight of the fan may be reduced. |
