| 摘要 |
<p>PURPOSE:To protect the glass plate on the pressure sensitive surface of the device when the device is transported by providing an auxiliary power source and alarming means and generating an alarm in the case the pressure sensitive surface is pressed while the main power supply is disconnected. CONSTITUTION:A supllied power source Vcc, battery BAT, and resistors Rx and Ry respectively constituting pressure sensitive input devices are provided and the voltage dividing ratio varies depending upon the pressed location along the (x) or (y) axis. Transistors QBU1 and QBU2 are turned on when the supplied power source Vcc is disconnected and a piezo-electric buzzer Buzz is controlled by means of the transistor QBU2 which is turned on when the power source Vcc is disconnected, receives power supply from the battery BAT, and produces sounds when one of the input devices is pressed. Therefore, the power supply to a position detecting means can be secured and the pressing of a pressure sensitive surface can be detected even after the main power supply Vcc is disconnected. In addition, since the alarming means Buzz is driven by means of the auxiliary power source BAT, an alarm can be issued when the pressure sensitive surface is wrongly pressed with no object of inputting information.</p> |
