| 摘要 |
PROBLEM TO BE SOLVED: To provide a reliable system for limiting the use of a portable telephone set or the like entering a place where the use of the portable telephone set or the like is limited by applying automatic warning to the portable telephone set or the like. SOLUTION: The use limiting device 1 for a portable telephone set or the like consists of a pseudo signal transmission section 2 that always transmits a pseudo signal simulating a specific signal sent from a base station of the portable telephone set or the like to a portable telephone set or the like from its antenna 3, a radio wave reception section 4 that receives a radio wave through the antenna 3, a signal processing section 5 that processes the signal from the radio wave reception section 4 and transmits a warning signal when detecting a radio wave from a portable telephone set or the like in the received radio wave, and a warning transmission section 6 having a display panel or a speaker to generate a warning voice or a warning display when receiving the warning signal.
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