| 摘要 |
A keyboard having e.g. for a mobile phone or PDA, that reduces the chance of simultaneous input of more than one character, and increases the speed and accuracy of character entry. The keyboard comprises a plurality of keys 7, each of which can be used to input at least two characters with a single actuation of the key. Simultaneous input of more than one of the characters is inhibited by means of an inelastic rocker (18, Fig. 4) underneath each key, about which the key can be tilted. With sufficient downward force of part of the key, a corresponding pin (19, 20, 21, Figs. 4 and 5) under the key contacts the key matrix causing a circuit to be completed. Locating ridges (27, Figs. 4 and 5) can be provided on the key surfaces. A plug-in mouse can be provided with the keyboard (50, Fig. 11). Special keys may be provided for "one touch" text editing, e.g. "copy", or "paste" (Fig. 15). A water-resistant cover overlaying the keys, and a user removable cover through which the keys project, are also described.
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