US 11,856,381 B2
Vibration device
Jun Akiyama, Tokyo (JP); and Kento Sakurai, Tokyo (JP)
Assigned to AGC INC., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on Mar. 22, 2022, as Appl. No. 17/701,624.
Application 17/701,624 is a continuation of application No. PCT/JP2020/035598, filed on Sep. 18, 2020.
Claims priority of application No. 2019-177814 (JP), filed on Sep. 27, 2019.
Prior Publication US 2022/0217470 A1, Jul. 7, 2022
Int. Cl. H04R 7/08 (2006.01); H04R 1/02 (2006.01); H04R 1/28 (2006.01); H04R 7/18 (2006.01); H04R 7/26 (2006.01)
CPC H04R 7/08 (2013.01) [H04R 1/025 (2013.01); H04R 1/288 (2013.01); H04R 7/18 (2013.01); H04R 7/26 (2013.01); H04R 2307/023 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A vibration device comprising:
a glass diaphragm;
an exciter which is fixed to the glass diaphragm and vibrates the glass diaphragm;
an enclosing member which defines an internal space by enclosing a portion, including a fixing position of the exciter, of the glass diaphragm, one end portion of the glass diaphragm being exposed to outside the internal space through an opening of the internal space; and
a shielding member for acoustic shielding between the opening and the glass diaphragm, the shielding member dividing the glass diaphragm into an excitation region located inside the internal space and a vibration region located outside the internal space, wherein a ratio Ss/Sv of an area Ss of the excitation region of the glass diaphragm to an area Sv of the vibration region of the glass diaphragm is 0.01 or larger and 1.0 or less.