| 摘要 |
<p>PURPOSE:To secure the rise-up of a suitable high voltage in response to a load, and improve the reliability of operation of an apparatus by determining the time constant regulating the rise-up of a high voltage according to the value of a load to be connected with a high voltage outputting means. CONSTITUTION:A high voltage outputting means is provided, which outputs a high voltage to be applied at the time of writing and erasing information. Based on a load to be connected with the high voltage outputting means, the time constant is determined. As a result, the stable rise-up of a high voltage can be secured in spite of change of the load. For example, at the time of collective erasing mode, a rising-up potential becomes larger only at the point of a capacitor C6, and the time necessary to reach said potential becomes long. As the result, the period of 0V of a signal from a differential circuit, which period corresponds with the transient period of a signal S, C, becomes long, and effective erasing is enabled even in the case of collective erasing.</p> |
