US 12,015,898 B2
Transducer and driving method thereof, and system
Takashi Naiki, Kyoto (JP); Tomohiro Date, Kyoto (JP); and Noriyuki Shimoji, Kyoto (JP)
Assigned to ROHM CO., LTD., Kyoto (JP)
Filed by ROHM CO., LTD., Kyoto (JP)
Filed on Nov. 2, 2022, as Appl. No. 17/979,419.
Application 17/979,419 is a continuation of application No. PCT/JP2021/012219, filed on Mar. 24, 2021.
Claims priority of application No. 2020-088169 (JP), filed on May 20, 2020.
Prior Publication US 2023/0051555 A1, Feb. 16, 2023
Int. Cl. H04R 17/00 (2006.01); H04R 7/10 (2006.01); H04R 7/18 (2006.01); H04R 17/10 (2006.01)
CPC H04R 17/10 (2013.01) [H04R 7/10 (2013.01); H04R 7/18 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A transducer comprising:
a piezoelectric element; and
a film body including a film support portion having a hollow portion, and a vibration film connected to the film support portion and displaceable in a film thickness direction, the film body having the piezoelectric element stacked over the vibration film, wherein
the piezoelectric element includes:
a first stacked body having a first pair of electrodes and a first piezoelectric filth sandwiched between the first pair of electrodes; and
a second stacked body having a second pair of electrodes and a second piezoelectric film sandwiched between the second pair of electrodes, the second stacked body being separated from the first stacked body;
the piezoelectric element and the film body form a vibration body; and
the first stacked body and the second stacked body each have a driving voltage applied thereto, and are configured to be driven individually by the driving voltages respectively applied thereto to thereby change a resonant frequency of the vibration body.