| 摘要 |
PURPOSE:To easily save and rewrite image information and to obtain sharp characters with good contrast by using liquid crystal which has thermo-optic effect as a recording medium for the image information and recording an image by the thermo-optic effect. CONSTITUTION:Aniline black is vapor-deposited on the inside surface of a substrate 3, the internal surfaces of substrates 1 and 3 are oriented vertically, and liquid crystal 2 which has smectic A phase is injected and sealed to obtain the liquid-crystal element 4. This liquid-crystal element 4 is passed under a heater 7 which has a temperature gradient of 70-25 deg.C in about 1-3sec. The liquid-crystal layer becomes transparent and the display surface of the liquid- crystal element 4 becomes black; when impulsive heat application of about 2J/cm<2> is carried out by a thermal head 9 to write characters, sharp characters appear in white on a back ground. When copper phthalocyanine or permanent red F5R is vapor-deposited on the substrate 3, sharp white characters are obtained on the blue-ground substrate by the former or on the red-ground substrate by the latter. |
