| 摘要 |
PROBLEM TO BE SOLVED: To provide a loss prevention machine consisting of a pair of a master set and a slave set and capable of reacting to separation beyond fixed distance between the master set and the slave set and reacting to approach to a specific distance between the master set and the slave set so as to detect an article lost and looked for. SOLUTION: The master set (A) intermittently sends a radio wave (t) for a fixed period (TIME). The slave set (B) receives (r) the radio wave (t), and immediately after the reception of the radio wave (t), sends a radio wave (t) back to the master set (A). The master set (A) checks the radio wave (t). The above cycle of processing is repeated. When the period is disturbed, the master set (A) reacts to the disturbance and informs of the disturbance by buzzing or the like. Consequently, the loss of belongings can be prevented.
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