| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a portable telephone set provided with a power generator which can prolong the use time of a battery and can secure a use state even if the accumulation quantity of the battery lacks. SOLUTION: A telephone set body 11 of the portable telephone set is provided with a first battery 12, and the power generator 20 having a machine energy generation part 21 generating machine energy automatically or by a manual operation, a gear string 22 transmitting machine energy generated in the machine energy generation part 21, a power generator 23 converting machine energy transmitted by the gear string 22 into electric energy, a voltage control circuit 24 converting power generated in the power generator 23 into DC voltage, a second battery 25 accumulating power outputted from the voltage control circuit 24 and a switch circuit 26 which selectively switches the first battery 12 and the second battery 25 is incorporated in the telephone body 11.</p> |
