US 11,991,497 B1
Acoustic device and holder flattening frequency response
Chao-Yu Chen, Kaohsiung (TW); Chiung C. Lo, San Jose, CA (US); Jemm Yue Liang, Sunnyvale, CA (US); Wen-Chien Chen, New Taipei (TW); and Jye Ren, Taipei (TW)
Assigned to xMEMS Labs, Inc., Santa Clara, CA (US)
Filed by xMEMS Labs, Inc., Santa Clara, CA (US)
Filed on Jun. 16, 2023, as Appl. No. 18/336,030.
Claims priority of provisional application 63/420,096, filed on Oct. 28, 2022.
Int. Cl. H04R 1/28 (2006.01); H04R 1/10 (2006.01); H04R 1/24 (2006.01); H04R 19/02 (2006.01)
CPC H04R 1/2811 (2013.01) [H04R 1/1016 (2013.01); H04R 1/24 (2013.01); H04R 19/02 (2013.01); H04R 2201/003 (2013.01)] 30 Claims
OG exemplary drawing
 
1. An acoustic device, comprising:
a first sound producing component having a first front side and a first back side, wherein the first sound producing component is a high frequency sound unit, and the first front side faces a sound propagating opening of the acoustic device; and
a back cavity structure connected to the first back side of the first sound producing component;
wherein the first sound producing component produces a first acoustic wave from the first front side towards the sound propagating opening, and the first sound producing component produces a second acoustic wave from the first back side towards a back cavity of the back cavity structure;
wherein the back cavity structure is configured to flatten a peak or a dip of a frequency response of the first sound producing component;
wherein a length of an acoustic path within the back cavity is a half wavelength or a quarter wavelength corresponding to a frequency, such that the frequency response of the first sound producing component at the frequency is flattened.
 
22. A holder, disposed or to be disposed within an acoustic device, comprising:
a back cavity structure, formed within the holder;
wherein when the holder is disposed within the acoustic device, a first sound producing component is disposed on the holder, the back cavity structure is connected to a first back side of the first sound producing component, the first sound producing component produces a first acoustic wave from a first front side towards a sound propagating opening of the acoustic device, and the first sound producing component produces a second acoustic wave from the first back side towards a back cavity of the back cavity structure;
wherein the first sound producing component is a high frequency sound unit;
wherein a length of an acoustic path within the back cavity is a half wavelength or a quarter wavelength corresponding to a frequency, such that a frequency response of the first sound producing component at the frequency is flattened.