| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the effect of reducing sound pressure and increasing medium particles moving speed in a low frequency band without increasing the resonator size. <P>SOLUTION: The tubular sound resonator 10 includes a tube 11 having a columnar hollow area 113 inside and extending between its open end 111 and closed end 112. A cylindrical resistance piece 12 having a cylindrical center cavity is formed close to the open end 111. The resistance piece 12 is formed including a smaller area at each position facing the extending direction (center axis x direction) of the cavity. The hollow area 113 includes an area where the sound pressure of the resonant frequency changes according to the position in the center axis x-direction when resonating. The resistance piece 12 develops a phenomenon different from the resonance when it includes a single tube 11 and the resonant frequency of the sound resonator 10 shifts to the lower frequency side, than the case of the single tube 11. <P>COPYRIGHT: (C)2011,JPO&INPIT |
