| 摘要 |
<p>PURPOSE:To retrieve an article easily and quickly by syntonizing natural frequency of an article to be retrieved with a received frequency, setting high a receiving sensitivity, and gradually lowering the sensitivity on receiving to specify a position of the article to be retrieved. CONSTITUTION:A plurality of articles 1 to be retrieved are respectively provided with a retrieval daughter device 2 having transmitting means 3 for outputting undulation such as electric wave, ultrasonic wave or the like different in frequency, syntonizing means 6 and sensitivity adjust means 7 are fixed to a retrieval parent device 4 adapted to receive undulation from transmitting means 3 through directional receiving means 5. In case of retrieval, first the natural frequency of an article 1 is matched with the received frequency of the parent device 4 by the means 6, and the receiving sensitivity is set high by the means 7, wherein when undulation from the article 1 is received, the direction of the means 5 is changed, with the receiving sensitivity gradually lowered by the means 7 to retrieve the article 1 according to the sensitivity of undulation from an object of retrieval and the direction of the means 5. Thus, the article 1 can be retrieved easily and quickly.</p> |
