| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an acoustic radiating membrane for a music box or striking watch, made so as to provide uniform acoustic efficiency across the audible frequency band (1-4 kHz). <P>SOLUTION: An acoustic radiating membrane (1) for a striking watch (10) includes areas (2, 3) asymmetrically formed in the material of the membrane (1). The thicknesses of the areas (2, 3) are different from the general thickness of the membrane. The areas (2, 3) have elliptical shapes. The areas (2, 3) with elliptical shapes are formed by hollowing out of the membrane (1) with uniform thicknesses different from each other, which are thinner than a bottom part (4) of the membrane (1). The two areas (2, 3) are partly superposed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
