| 摘要 |
A key unit having means whereby a reinforcement plate, which is formed of a rigid material, such as a metal or a hard resin, and is prepared in order to provide a shape maintenance property for a rubber keypad included in a key unit, is employed not simply for maintaining the shape of the keypad, but more variously, as a functional design component of a mobile device that includes a key unit. A key unit having a case wherein a key operation portion of a keypad is formed using a flexible rubber material, and the other portion of the keypad is formed using a rigid reinforcement plate, or is reinforced by a reinforcement plate, characterized by the integral formation, with the key unit that includes the reinforcement plate, of at least a part of a case for a mobile device on which the key unit is to be mounted.
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