US 11,838,726 B2
Pressure wave-generating device and method for producing the same
Masato Goto, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Jan. 13, 2022, as Appl. No. 17/574,851.
Application 17/574,851 is a continuation of application No. PCT/JP2020/031476, filed on Aug. 20, 2020.
Claims priority of application No. 2019-158290 (JP), filed on Aug. 30, 2019.
Prior Publication US 2022/0141597 A1, May 5, 2022
Int. Cl. H04R 7/04 (2006.01); H04R 23/00 (2006.01); H04R 31/00 (2006.01)
CPC H04R 23/002 (2013.01) [H04R 7/04 (2013.01); H04R 31/003 (2013.01)] 15 Claims
OG exemplary drawing
 
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.