Patent ID: 7130436
Filing Date: 2006-10-31
Classification: A42B,H04R

Abstract:
1. A piezoelectric speaker, comprising: a frame having an opening therein, the opening extending between a back surface and a front surface of the frame; a piezoelectric film having a back surface area larger than the opening in said frame, the piezoelectric film being located on said back surface of said frame and covering said opening; a laminating film having a central portion and a peripheral portion, the central portion covering and protecting an entire back surface of said piezoelectric film, and the peripheral portion extending beyond all sides of the piezoelectric film for covering and protecting sides edges of the piezoelectric film that are perpendicular to the back surface, and for attaching to peripheral portions of said back surface of said frame; and a fastener secured to said laminating film at a position overlapping edges of the piezoelectric film but not overlapping the opening, the fastener for detachably fastening a back side of said piezoelectric speaker to an exposed inner surface of a shell of a helmet, and a front side of the piezoelectric film being exposed.