| 摘要 |
PURPOSE:To automatically open a line by providing a temperature measuring means in the part, where will be brought into contact with a human body, of a handset and detecting the change of temperature to control opening/closing of the wire line. CONSTITUTION:When an incoming call comes in the stand-by state of a portable telephone set, a hook button is depressed by the manual operation to turn on a transmitter 19, and the hook signal is sent to a fixed radio station. In this state, speaking by the telephone set is possible, and speaking is started. When a receiver 11 is applied to the ear of the speaker simultaneousIy with the start of speaking, a thermometric part 12 is brought into contact with his human body and the temperature rises. A control part 14 measures the temperature change at intervals of a prescribed time from this time; and when it is judged that the telephone set is separated from the human body to terminate the speaking, a power source is turned off and the stand-by state is restored, Thus, the line is automatically disconnected without depressing a switch for the end of speaking, and the efficient operation is possible and the unnecessary consumption of a battery is prevented. |
