Patent ID: 9658601
Date: 2017-05-23
CPC Classifications: G04B,G10K,H04R

Claim:
1. An acoustic radiating membrane for a musical watch or a striking watch, the membrane comprising: an active central portion and an edge portion, the active central portion extending inward from the edge portion where the membrane is held in a watch case, wherein the central portion is configured in a convex shape to promote vibration of the membrane according to a first unipolar deformation mode, following activation of the membrane by one or more frequencies within a range between 500 Hz and 3.5 kHz, wherein the convex central portion is a spherical cap for the membrane of a generally circular shape, wherein the spherical cap is part of a sphere of a radius N times greater than a diameter of the central portion, and wherein the radius of the spherical cap is between 6 and 8 times greater than the diameter of the central portion.