| 摘要 |
PROBLEM TO BE SOLVED: To enable long-distance communication to be performed by utilizing a ZigBee wireless to carry out communication of a plurality of devices in a multihop function, suppressing the occurrence of interference, and to enable notification to be surely performed even in noise environment by making hitting noise generate in a helmet of an operator by emergency information or the like generated due to falling down of the other operator affected by an accident.SOLUTION: An information transmission device 10a is attached to a helmet 2a of an operator A. When the operator A falls down, for example, an impact is detected by an acceleration sensor, and an SOS signal is transmitted: it is received by an operator B by a multi-hopping communication. At the operator B, hitting noise is generated in a helmet 2b by the SOS signal, the operator B can know this fact even in noise environment. An information transmission device 10b relays emergency information from the information transmission device 10a. Therefore, when seen from the operator A, information of falling down is transmitted also to an operator C outside a communication range and hitting noise is similarly generated. |
