发明名称 |
ELECTROACOUSTIC TRANSDUCER, MANUFACTURING METHOD THEREOF, AND ELECTRONIC DEVICE UTILIZING SAME |
摘要 |
The present invention contributes to transmitting a highly directional acoustic wave(s) with high efficiency. An electroacoustic transducer comprises a piezoelectric vibrator; a casing being provided with a predetermined space from the piezoelectric vibrator and including a frustum shape cutout in an inner wall thereof; and an acoustic absorption material being fitted in the cutout wherein a sound hole is formed in the casing in front of the piezoelectric vibrator in an oscillating direction of the piezoelectric vibrator; and the casing is formed in the casing such that a hole diameter of a sound path decreases toward a front end in the oscillating direction of the piezoelectric vibrator. |
申请公布号 |
EP2908552(A4) |
申请公布日期 |
2016.06.08 |
申请号 |
EP20130847236 |
申请日期 |
2013.10.11 |
申请人 |
NEC CORPORATION |
发明人 |
ONISHI, YASUHARU |
分类号 |
H04R17/00;H04R1/40;H04R3/00;H04R31/00 |
主分类号 |
H04R17/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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