| 摘要 |
<p>PURPOSE:To facilitate a design of a scan control circuit with improvement of reliability for reading the writing pressure coordinates and to attain the faithful reproduction of the writing contents, by providing a means which detects the electromotive force generated by the writing pressure to an electronic blackboard made of a polymer piezoelectric material. CONSTITUTION:A means which detects the electromotive force generated by the writing pressure is provided to an electronic blackboard made of a sheet type polymer piezoelectric material. For instance, the scan signals are transmitted to an X axis input circuit 9, a Y axis input circuit 10 and a matrix circuit 12 from a scan control circuit 11. The writing pressure coordinates on an electronic blackboard 1 are supplied to the circuit 12 via the circuits 9 and 10. The circuit 12 converts the output signals given from the blackboard 1 into data signals for each 2-bit block. These data signals are written to a memory circuit 13 by the writing signal given from the circuit 11. Then a microcomputer 18 reads the data signal out of the circuit 13 and displays the contents written on the blackboard 1 to a terminal device, a printer, etc.</p> |
