CPC H04R 23/002 (2013.01) [H04R 7/04 (2013.01); H04R 31/003 (2013.01)] | 15 Claims |
1. A pressure wave-generating device, comprising:
a support; and
a heating element film disposed over the support and configured to generate heat by energization, the heating element film having a porous metal structure.
wherein when the heating element film is divided into a back surface region located on a support side from a thickness center and a front surface region located across the thickness center from the support side, a Pt/Pb ratio of a pore fraction Pt of the front surface region to a pore fraction Pb of the back surface region is 1.02 to 2.01.
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