发明名称 |
Electroacoustic transducer |
摘要 |
A plurality of grooves are radially formed in an annular frame and an annular plate is secured to the frame to form a sound discharge hole in each groove, thereby communicating a back chamber under a diaphragm with the atmosphere. A projected part is outwardly projected from a peripheral edge of the annular plate, and an adhesive is adhered to a peripheral edge of a protector and to an upper surface of the projected part to adhere the protector with the annular plate.
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申请公布号 |
US2004125981(A1) |
申请公布日期 |
2004.07.01 |
申请号 |
US20030623513 |
申请日期 |
2003.07.22 |
申请人 |
CITIZEN ELECTRONICS CO., LTD. |
发明人 |
FURUYA MASAHITO |
分类号 |
H04R9/02;H04M1/03;H04R1/02;H04R7/22;H04R9/10;(IPC1-7):H04R1/02;H04R1/00;H04R9/06;H04R11/02 |
主分类号 |
H04R9/02 |
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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