| 摘要 |
PROBLEM TO BE SOLVED: To allow a user of a mobile wireless receiver to surely recognize battery shutoff by allowing a vibration section to continue the vibration of a receiver main body until a vibration stop operation is executed or the voltage of the battery drops to the voltage incapable of normally operating the receiver. SOLUTION: This wireless service call system comprises transmitters 3-1, 3-2,... placed on tables or the like used by customers, a wireless repeater 2 that is placed at a waiting place of shop clerks or a cook room, relays call signals from the transmitters 3-1,... and transmits the signals to a mobile wireless receiver 1, and the mobile wireless receiver 1 that is carried by each shop clerk. The wireless repeater 2 transmits a received control signal without modifying its form at the lapse of a prescribed time after receiving the control signal. Then a CPU of the mobile wireless receiver 1 always monitors an output voltage of a battery section and transmits a ringing instruction signal to a vibration section when the output voltage reaches a battery shutoff level. This signal is continuously transmitted until the voltage of the battery reaches the operation voltage stop level incapable of operating the receiver. |
