| 摘要 |
<p>PURPOSE:To make it possible to discriminate the information which has been specifically indicated by the input pen, by periodically inverting the magnetized direction of the ferrite memory magnetic core, and making magnetic force from the magnetic field generation part operate on the information board which is able to detect the magnetized inversion. CONSTITUTION:The information board 1 is constituted so that the address lines X, Y of the ferrite memory magnetic cores a-p arrayed in matrix can be entirely magnetized and inverted periodically in order by making the pulse currents I, -I reciprocally, and at the same time the induced voltage accompaning to the magnetized inversion can be detected by the information line S. When the magnetic core on the information board 1 is pushed by the input pen 2 containing the magnetic field generation part 4, the magnetic core C becomes a magnetic saturation state by the magnetic field H from the generation part 4, and the magnetic inversion phenomenon is not caused. The induced voltage due to magnetized inversion of the magnetic core C which has received the near-by instruction by the pen 2 is not detected by the information line S, and therefore the information of the near-by instruction by the pen 2 can be discriminated. In this regard, if a magnetic body plate is provided under the information board 1, it is possible to shut off the magnetic field generated to the outside when the pen 2 has been detached from the information board.</p> |
