| 摘要 |
PURPOSE:To prevent erasion of the unknown message information without using any secondary power supply by outputting a dislocation signal when the attachment position of a battery cover has dislocation and then outputting a singing signal if the message information is stored in a memory part during output of said dislocation signal. CONSTITUTION:When a user slides a battery cover 22 toward A for removal, a switch 10 is opened and a dislocation signal is supplied to a signal processing part 3. Then the part 3 is forcibly switched to a message information erasion alarm mode. The message information if held is read out of a memory part 4 and supplied to a display driving part 5. Thus a flag is set at '0' and otherwise the flag is kept at '1'. If th flag has just a single '1', the part 3 supplies a singing signal to a singing amplifying part 7. Then a speaker 8 works to produce an alarm and to call user's attention. Thus a battery 11 is removed to avoid erasion of the message information. |
