Title:
ACOUSTIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/184515
Kind Code:
A1
Abstract:
Disclosed in embodiments of the present description is an acoustic device. The device comprises a piezoelectric assembly, an electrode and a vibration assembly. The piezoelectric assembly vibrates under the action of a driving voltage; the electrode provides the driving voltage for the piezoelectric assembly; and the vibration assembly is physically connected to the piezoelectric assembly, receives the vibration and produces sound. The piezoelectric assembly comprises a substrate and a piezoelectric layer; the piezoelectric layer covers one surface of the substrate; the electrode covers one surface of the piezoelectric layer; and the coverage area of the electrode on the surface of the piezoelectric layer is smaller than the area of the surface of the substrate covered with the piezoelectric layer. According to the present description, a modal actuator of the piezoelectric assembly is formed by means of electrode design, such that the piezoelectric assembly outputs a specific modal shape, and sound characteristics of the acoustic device are improved. Moreover, compared with adding a modal control system consisting of various mechanical structures in a specific region, the present application implements modal control of the piezoelectric assembly by means of the electrode design, and the structure of the acoustic device can be simplified.
Inventors:
ZHU GUANGYUAN (CN)
ZHANG LEI (CN)
QI XIN (CN)
ZHANG LEI (CN)
QI XIN (CN)
Application Number:
PCT/CN2022/084935
Publication Date:
October 05, 2023
Filing Date:
April 01, 2022
Export Citation:
Assignee:
SHENZHEN SHOKZ CO LTD (CN)
International Classes:
H04R17/00; H04R1/00
Domestic Patent References:
| WO2002078099A2 | 2002-10-03 | |||
| WO1989002658A1 | 1989-03-23 |
Foreign References:
| CN111727610A | 2020-09-29 | |||
| JP2006238072A | 2006-09-07 | |||
| CN108370475A | 2018-08-03 | |||
| CN102143424A | 2011-08-03 | |||
| CN109417672A | 2019-03-01 | |||
| JP2010175521A | 2010-08-12 |
Other References:
See also references of EP 4284020A4
Attorney, Agent or Firm:
METIS IP (CHENGDU) LLC (CN)
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