US 11,876,503 B2
Resonance device
Yuichi Goto, Nagaokakyo (JP); and Keisuke Takeyama, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Feb. 1, 2021, as Appl. No. 17/164,287.
Application 17/164,287 is a continuation of application No. PCT/JP2019/010016, filed on Mar. 12, 2019.
Claims priority of application No. 2018-155469 (JP), filed on Aug. 22, 2018.
Prior Publication US 2021/0159884 A1, May 27, 2021
Int. Cl. H03H 9/10 (2006.01); H03H 9/24 (2006.01)
CPC H03H 9/2457 (2013.01) [H03H 9/1057 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A resonance device comprising:
a lower cover;
an upper cover joined to the lower cover;
a resonator having a vibrating arm that bends and vibrates in a vibration space between the lower cover and the upper cover; and
a particle attached to a tip portion of the vibrating arm, wherein
when a median size of the particle is defined as D50, a specific gravity of the particle is defined as A, and a resonant frequency of the resonator is defined as X, D50≤189/(X×√A).