US 11,754,830 B2
Vibration device and vibration control method
Katsumi Fujimoto, Nagaokakyo (JP); and Takahide Nakadoi, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on May 14, 2021, as Appl. No. 17/320,283.
Application 17/320,283 is a continuation of application No. PCT/JP2020/040641, filed on Oct. 29, 2020.
Claims priority of application No. 2020-057845 (JP), filed on Mar. 27, 2020.
Prior Publication US 2021/0302723 A1, Sep. 30, 2021
Int. Cl. G02B 27/00 (2006.01); B06B 1/02 (2006.01); B06B 1/06 (2006.01); B08B 7/02 (2006.01); B60S 1/62 (2006.01)
CPC G02B 27/0006 (2013.01) [B06B 1/0207 (2013.01); B06B 1/0651 (2013.01); B08B 7/02 (2013.01); B06B 2201/77 (2013.01); B60S 1/62 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A vibration device comprising:
a light transmissive body to transmit light of a predetermined wavelength;
a first cylindrical body having a cylindrical shape including a first end and a second end in an axial direction of the first cylindrical body, and supporting the light transmissive body at the first end;
a plate-shaped spring portion supporting the second end of the first cylindrical body;
a second cylindrical body having a cylindrical shape including a first end and a second end in an axial direction of the second cylindrical body, and supporting, at the first end, a position of the spring portion in an outer side portion of a position at which the first cylindrical body is supported; and
a vibrating body on the second end side of the second cylindrical body to vibrate in the axial direction of the second cylindrical body;
wherein
the light transmissive body includes a main body portion on an inner side of a portion supported by the first cylindrical body, and a protruding portion extending from the main body portion toward an outer circumference of the light transmissive body and protruding outward more than a portion supported by the first cylindrical body;
a ratio between an equivalent mass calculated from a moment of inertia of the protruding portion and a weight of the main body portion is equal to or more than about 0.8 and equal to or less than about 1.2; and
a resonant frequency of the light transmissive body is larger than a resonant frequency of the spring portion.