| 摘要 |
PROBLEM TO BE SOLVED: To surely avoid pressing down a key mistakenly by detecting how a receiver is used and generating a signal that urges the lighting of a light. SOLUTION: A receiving action detecting part 22 grounds at least one of two conductive plates, connects the other to one input of a comparator, also is connected to a power supply through blocking resistance, divides power supply with resistance value between the conductive plates and resistance value of the blocking resistance, compares the partial pressure voltage with reference voltage of the other input of the comparator and decides the logic of a detection signal. And, because a receiver 14 is separated from an ear when a controlling part 20 decides that it is not a receiving action in a speech communication mode, it is decided that a light is turned on and if it is not light lighting, a dummy key event is generated to urge to execute a light lighting program. |
