| 摘要 |
PURPOSE:To reduce write and read cycles by applying and holding mutually different voltages that are higher than the voltage in which the secondary electron emission ratio is set to 1 first to two collectors, writing electric signals, applying and holding the same voltage, and reading the signals. CONSTITUTION:For write, a switch is set as shown in the figure to generate potential difference in first and second collector electrodes 6 and 7. When the higher voltage than an electrode 22 is applied to the electrodes 6 and 7 from power supplies 28 and 30 and write is performed by an electron beam, secondary electrons are generated and electron-positive hole pairs are also generated in a solid. These electrons are caught by the electrode 7 and the positive hole increases the potential of a storage surface 8. When the same voltage is applied to the electrodes 6 and 7 using switches 26 and 30 as contacts c and d, the center of the storage surface 8 has higher potential than the electrodes 6 and 7 due to the positive hole for a write section and no-write section is kept in the same potential. For read, the amount of electrons applied to the electrodes 6 and 7 differs depending upon the presence of the positive hole and the potential of the storage surface 8 and electrodes 6 and 7 is set to the same erase status. As a result, write and read are made possible and the cycle can be reduced. |
