| 摘要 |
After a pill (1) is introduced into a subject, biological information on the subject is acquired via the pill (1). The biological information from the pill (1) is input to a receiver via a reception antenna. The pill (1) receives a power supply signal supplied from the receiver via the reception antenna (17) and the power supply signal is reproduced as power by a power reproduction circuit (19). The power reproduced is compared to a predetermined value by a level judgment circuit (20). According to this comparison result, intensity of the power supply signal is radio-transmitted as the judgment result signal to the receiver.
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