| 摘要 |
<p>PURPOSE:To easily and surely detect the time of replacement of an input board, by providing fastening fixtures made of magnetic substance etc. to fix an auxiliary input board with the character input board, and coupling a current drive line and a current detecting line corresponding to the position of the fastening fixture via the fixture electromagnetically. CONSTITUTION:Current drive lines D1...D3 and current detecting lines S1...S3 are located within the region fitted with an auxiliary input board 5 and under a main input board 4 orthogonally each other. Further, fastening fixtures 6 and 7 made of magnetic substance or conductor to fix the auxiliary input board 5 are provided on a character input board 1, and the current drive line and the current detecting line corresponding to the position of the fixture are electromagnetically coupled via the fixture. Thus, the presence or absence of the fixture is detected and the time of replacement of the input board can easily and surely be ohtained.</p> |
