| 摘要 |
PURPOSE: An extension device of a PDA is provided to efficiently extend an interface offered by a PDA, and to enable a user to simultaneously use at least two extended functions of the PDA. CONSTITUTION: The device comprises the first extension module(21) and the second extension module(22). The first extension module(21) includes a basic interface and cotrolling part(211), the first extension function module(212), the first interface converter(213) and an additional interface(214). The second extension module(22) includes a battery(221), an additional interface(222), the second interface converter(223) and the second extension function module(224). The basic interface and cotrolling part(211) performs a data exchange with a main body by linking to a program installed at the main body. The first interface converter(213) processes an interface conversion between the basic interface(211) and the additional interface(214). The battery(221) supplies an operational power to each part of the extension modules(21, 22). The additional interface(222) processes a data exchange with the additional(214) of the module(21). The second interface converter(223) processes an interface conversion between the additional interface(222) and the second extension function module(224).
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