Patent ID: 6862358
Filing Date: 2005-03-01
Classification: A42B,H04R

Abstract:
1. A motorcycle helmet including a hard, thin helmet shell, said helmet comprising: a head liner fixed on an inner surface of said helmet shell; a head inner removably and dividedly mounted so as to cover the head liner; ear inners and a chin inner removably and dividedly mounted with respective liners on the inner surface of said helmet shell; and a plurality of piezo-film speakers mounted directly to the inner surface of said helmet shell, wherein each of said piezo-film speakers includes a piezo-film curvedly supported to form at least one curved portion, said piezo-film having at least a radius (R) of curvature at each curved portion in a range of R≧200 mm or an area (S) of a principal surface of said piezo-film is in a range of S≧40 cm