| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor siren which has proper sound production efficiency and can be made small in size, reduced in power consumption and extended in sound coverage. SOLUTION: The motor siren comprises a plurality of sound-emitting parts 2, 2... which are driven by a single revolving shaft 1 and are different by the sound emission frequencies. The motor siren comprises a plurality of synchronously rotating fan rotors 3, 3... which are stored, respectively in rotor casings 5 provided with the different numbers of air inlet windows 4, or comprises a plurality of fan rotors 3, 3... which are provided with a different number of rotating blades 6 and are rotated synchronously and are stored, respectively in the rotor casing 5 provided with wind inlets 4. COPYRIGHT: (C)2007,JPO&INPIT
|
