US 12,279,097 B2
Vibration plate and method for manufacturing vibration plate
Yusuke Sai, Tokyo (JP); and Hirotsugu Nakayama, Tokyo (JP)
Assigned to FOSTER ELECTRIC COMPANY, LIMITED, Tokyo (JP)
Appl. No. 17/995,348
Filed by Foster Electric Company, Limited, Tokyo (JP)
PCT Filed Mar. 31, 2021, PCT No. PCT/JP2021/014051
§ 371(c)(1), (2) Date Oct. 3, 2022,
PCT Pub. No. WO2021/201180, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-066461 (JP), filed on Apr. 2, 2020.
Prior Publication US 2023/0156420 A1, May 18, 2023
Int. Cl. H04R 31/00 (2006.01); H04R 7/12 (2006.01)
CPC H04R 31/003 (2013.01) [H04R 7/125 (2013.01); H04R 2307/021 (2013.01); H04R 2499/13 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A diaphragm for an electroacoustic transducer, the diaphragm comprising a paper substrate containing cellulose fibers as a main component;
wherein the paper substrate has a first surface region and a second surface region opposite to the first surface, the first surface region has a predetermined thickness from a second surface, the first surface region and the second surface region contain coloring particles, and the first surface region contains a greater total amount of coloring particles than the second surface region.