| 摘要 |
PROBLEM TO BE SOLVED: To surely sense an incoming alarm by a carrying person even when there is no margin for the occurrence of malfunction and further in the case of under a noisy environment or violent action and to unnecessitate a stop operation for stopping the alarm operation. SOLUTION: An incoming alarm system 1 is composed of an incoming detection part 13 for outputting a control signal when there is an incoming call to a housed portable radio telephone, power source part 14, portable housing case provided with a switch part, alarm mechanism 30 such as a vibrator, and the line from 50cm to 120cm for the terminal connection of them. First of all, when there is an incoming call, the control signal is applied from the incoming detection part 3 to the switch part, the switch is turned on, and driving power is supplied from the power source part 11 to the alarm device 30. Thus, since a received electric field gets lower than a threshold value when a user detects the incoming call and takes the portable radio telephone set out of the portable housing case 10, the control signal from the incoming detection part 13 is turned into '0', the switch part is turned off, and the supply of power to the alarm device 30 is cut off. |
