| CPC H04R 17/00 (2013.01) [H10K 59/00 (2023.02); H04R 2499/15 (2013.01)] | 27 Claims |
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1. A sound apparatus, comprising:
a plurality of piezoelectric devices configured to vibrate in response to a sound signal input thereto;
a plurality of vibration members; and
a frame connected to at least a portion of each of the plurality of vibration members,
wherein each of the plurality of piezoelectric devices is connected to a corresponding vibration member among the plurality of vibration members,
wherein frequency characteristics of a first piezoelectric device and a second piezoelectric device among the plurality of piezoelectric devices are different from each other,
wherein at least one of the plurality of piezoelectric devices includes a first piezoelectric layer, a second piezoelectric layer, a first electrode, a second electrode, a third electrode and a fourth electrode,
wherein the first electrode and the second electrode are disposed with the first piezoelectric layer therebetween in a thickness direction thereof,
wherein the third electrode and the fourth electrode are disposed with the second piezoelectric layer therebetween in a thickness direction thereof,
wherein the sound signal having a same phase is applied to the first electrode and the third electrode,
wherein the frame configures at least a portion of a housing which includes the plurality of the piezoelectric devices provided therein,
wherein one or more of the plurality of vibration members have different material characteristics, and
wherein the first piezoelectric device and the second piezoelectric device are connected to different vibration members of the plurality of vibration members.
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