| 摘要 |
PURPOSE:To make it possible to write a fine high-density pattern and to erase it easily, by constituting a double-layered structute consisting of a color developing layer and an ion supply source and irradiating it to develop a color and applying an electric field to erase the color. CONSTITUTION:A color developing layer 1 and an ion supply source 2 are provided close to each other and are held between ultraviolet ray-transmittable electrodes 3 and 4. When light 6 is irradiated, ultraviolet rays 6 are transmitted through the ultraviolet ray-transmissive electrode 3 and act upon an interface 7 between the color developing layer 1 and the ion supply source 2. This optical energy gives an energy E to cause a reaction, and color develops only in a part 8 to which the light is irradiated. When a voltage is applied across electrodes 3 and 4, color is erased, and this element is returned to the state before color development. Thus, a fine high-density pattern can be written and can be erased easily. |
