| 摘要 |
PROBLEM TO BE SOLVED: To save the power consumption of a battery and to prolong a communication period by stopping power supply from an internal battery to an LCD and an LED packaged in a portable telephone set when the main body of the portable telephone set is held in a hand and a receiver is brought into contact with the ear of a carrying person in a communication state. SOLUTION: When a CPU 15 receives an incoming call through a TX1, communication is started and the carrying person holds this portable telephone set in the hand and brings a transmitter 2 to his/her own ear, by the sensing detection of touch sensors 11-1 and 11-2, a sensor reception part 10 sends out detection signals to the CPU 15. Then, the CPU 15 controls a switch part 12 and stops voltage supply from the battery 13 to the LEDs 9-1 and 9-2 and the LCD 7. Then, when the CPU 15 detects communication end from the TX1 and an RX3, the CPU 15 controls the switch part 12 again, supplies a voltage from the battery 13 to the LCD 7 and the LEDs 9-1 and 9-2 and lights the LCD 7 and the LEDs 9-1 and 9-2. |
