| 摘要 |
A PORTABLE COMMUNICATION DEVICE (10) HAS AN ELECTRONIC CIRCUIT BOARD (20) ARRANGED INSIDE A HOUSING (12), AND A KEYPAD (30), THE INDIVIDUAL KEYS (32) OF WHICH ARE ARRANGED, WHEN DEPRESSED, TO COLLAPSE A RESPECTIVE TACTILE DOME (52) ON A DOMEFOIL (SO) INTERPOSED BETWEEN THE KEYPAD AND THE CIRCUIT BOARD, SO AS TO ESTABLISH ELECTRIC CONTACT WITH A RESPECTIVE CONTACT POINT (22) ON THE CIRCUIT BOARD. THE DOMEFOIL (50) IS FORMED AS A NON-CONDUCTIVE SHEET PROVIDING AN AIRTIGHT AND/OR ELECTROSTATIC SEAL BETWEEN THE KEYPAD (30) AND THE CIRCUIT BOARD (20). THE DOMEFOIL (50) PROTECTS THE CIRCUIT BOARD (20) FROM ELECTROSTATIC DISCHARGE.
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