| 摘要 |
<p>PURPOSE:To retrieve easily a document by fitting a wireless electric wave transmitter to transmit respectively different recognizing numbers to respective documents to be retrieved. CONSTITUTION:When a document 1 is opened, a fitted wireless electric wave transmitter 2 is operated, and the wireless electric wave with the recognizing number of the document 1 included as information is transmitted. Respective receiving parts 4a-4n receive this, adds the number of the receiving part and the information of the receiving electric field strength and transfers to a control part 9. The control part 9 collects and compares the receiving electric field strength for the same recognizing number of the constant period, recognizes that the document 1 is placed in the vicinity of the receiving part (for example, 4a) to show the strongest receiving electric field, and accumulates to a memory circuit 10 corresponding to the number of the receiving part 4a and the recognizing number. When the document 1 is retrieved, by inputting the recognizing number of the document 1 to an input output terminal 12, a processing device 11 accesses the memory device 10, reads the number of the receiving part corresponding to the recognizing number and displays at the input output terminal 12.</p> |
