| 摘要 |
PURPOSE:To provide a portable telephone set which is more miniaturized and is made light in weight without reducing the capacity of a battery. CONSTITUTION:By providing a battery 1 and a boosting circuit 2 on a battery pack 6, providing a constant voltage circuit 3 and a circuit network 4 on a main body 7 of a telephone set, inputting the output voltage of the battery 1 in the boosting circuit 2, inputting the output voltage of the boosting circuit 2 in the constant voltage circuit 3, and providing the boosting circuit 2 between the battery 1 impressing the output voltage of the constant voltage circuit 3 on the circuit network 4 and the constant voltage circuit 3, the output voltage of the battery 1 is possible to be set below the operating voltage of the circuit network 4 and the number of battery is reduced. Therefore, because the batteries where the occupancy ratio for the weight/volume of the whole of the telephone set is large can be reduced, a portable telephone set which is more miniaturized and is made light in weight can be realized. |
