| 摘要 |
PROBLEM TO BE SOLVED: To mount plural kinds of option devices having different specifications on a portable terminal. SOLUTION: The option device mounting/demounting device 10 has a general- use terminal group 14 equipped to a general-use slot in which a general-use option device is mounted, and a special terminal group 14 which is equipped separately from the general-use terminal group 14 and at least a part of which is used as a power supply passage. A power switching controller 24 is connected to a DC in-connector 32, and supplies power to a charging battery pack 26 for the main body, a main body circuit 28 or a switch circuit 30. A special terminal group is constructed by only special option devices which are designed to be used on the assumption of existence thereof. |
