| 摘要 |
Upper casing and lower casing of a portable telephone body enclose a body inner cavity in which a printed circuit board is disposed. The printed circuit board has an upper surface thereof on which a speaker body is fixedly mounted by means of soldering. A head portion of the speaker body is fitted with a cap in which a net is secured. An elastic rib formed in the upper portion of the cap and having a triangular cross section is pressed against the upper casing to thereby block entrance of any moisture and dust through a sound aperture without necessity of any adhesive and double-faced adhesive tape. The blocking of entrance of moisture and dust by the utilization of deformation of an elastic material may be applied to electronic parts other than the acoustic parts.
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