| 摘要 |
<p>PROBLEM TO BE SOLVED: To automatically discriminate an information display medium installed on a tablet, to hold an interface of a paper and a pen and to make it easier to use them by detecting the change of an induced electromotive force occurring to a second coil by mutual induction with a first coil when the information display medium moves. SOLUTION: When a coordinates recording device 1 detects with a detection circuit 15 that an information display medium 3 has been installed, it makes a whole system operation mode from a standby mode to an operation mode, normally drives an oscillation coil 6 and normally occurs a magnetic field by the oscillation coil 6 while recording. The magnetic field changes a magnetic field density by a resonance coil 4 equipped with the information display medium 3. Thus, when the information display medium 3 is removed or installed anew, a magnetic flux density of the magnetic field existing between the oscillation coil 6 and the resonance coil 4 changes and the induced electromotive force occurs to the oscillation coil 6. It is possible to detect the number of pages of the information display medium 3 or the like by measuring the induced electromotive force generated here.</p> |
