| 摘要 |
PURPOSE: A metal dome in a portable terminal is provided to increase the reliability of grounding by providing a plurality of grounding points. CONSTITUTION: A metal dome(200) has a hemisphere shape. A plurality of contact bosses(211) are formed at the inner lateral side(212) of the metal dome(200). It is desirable that three contact bosses(211) are distributed and formed in the shape of a triangle. In case that the metal dome(200) is pushed by the push operation of a key button, a plurality of contact points with a PCB(165) are generated as the contact bosses(211) are installed. Accordingly, even though a foreign substance exists at any of the contact points, grounding can be made validly.
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