| 摘要 |
PROBLEM TO BE SOLVED: To provide an earphone speaker which has superior electrostatic discharge (ESD) protection effect. SOLUTION: An earphone speaker includes a conductive housing, a micro speaker module, and a circuit board. The conductive housing has a holding space. The micro speaker module is disposed in the holding space. The circuit board is disposed outside the conductive housing and has a first surface facing toward the conductive housing and a second surface, corresponding to the first surface. A positive terminal and a negative terminal are disposed on the second surface and electrically connected to the micro speaker module. A conductive material layer is disposed on the first surface and is electrically connected to the negative terminal, and the conductive material layer is brought directly into contact with the conductive housing. COPYRIGHT: (C)2009,JPO&INPIT
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