| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress vibration of a metal plate to which an electric motor 23 is fixed to reduce noise.SOLUTION: A hit-out part 21A is provided on a plate 21, and first through holes 21C are provided in a level difference part 21B forming the outer periphery of the hit-out part 21A. The provision of the hit-out part 21A increases the characteristic frequency of the plate 21, and thereby the frequency of the electric motor 23, which is a vibration source, and the characteristic frequency of the plate 21 can be made significantly different from each other. Thus, the first through holes 21C provided in the level difference part 21B can reduce a load on a metal mold for pressing and suppress the vibration of the plate 21, and thereby noise can be reduced.</p> |
