| 摘要 |
PURPOSE:To erase automatically confidential information stored in a memory of a main body section against an external incorrect access by providing a means detecting it when a part of an outer case is opened to output an internal access signal and a means outputting an incorrect access signal when the output of the internal access signal is detected. CONSTITUTION:An internal access detection circuit 22 is a circuit generating an internal access signal when a door is opened for access to the inside, a columnar projection 14 is detached, a spring 15 is released and contacts are opened. Further, a deciding circuit 23 is a circuit generating an incorrect access signal by discriminating it as the incorrect access if the internal access signal is generated regardless that no access start signal is given, and an erase signal generating circuit 12 is a circuit generating a signal in receiving the incorrect access signal to erase confidential information stored in a memory 25. Through the constitution above, upon the arrival of the incorrect access, the confidential information stored in the memory is erased and the security of information is maintained. |
